_ Git - rust-lightning/blob - src/ln/channelmanager.rs

   1 //! The top-level channel management and payment tracking stuff lives here.
   2 //!
   3 //! The ChannelManager is the main chunk of logic implementing the lightning protocol and is
   4 //! responsible for tracking which channels are open, HTLCs are in flight and reestablishing those
   5 //! upon reconnect to the relevant peer(s).
   6 //!
   7 //! It does not manage routing logic (see ln::router for that) nor does it manage constructing
   8 //! on-chain transactions (it only monitors the chain to watch for any force-closes that might
   9 //! imply it needs to fail HTLCs/payments/channels it manages).
  10
  11 use bitcoin::blockdata::block::BlockHeader;
  12 use bitcoin::blockdata::transaction::Transaction;
  13 use bitcoin::blockdata::constants::genesis_block;
  14 use bitcoin::network::constants::Network;
  15 use bitcoin::network::serialize::BitcoinHash;
  16 use bitcoin::util::hash::Sha256dHash;
  17
  18 use secp256k1::key::{SecretKey,PublicKey};
  19 use secp256k1::{Secp256k1,Message};
  20 use secp256k1::ecdh::SharedSecret;
  21 use secp256k1;
  22
  23 use chain::chaininterface::{BroadcasterInterface,ChainListener,ChainWatchInterface,FeeEstimator};
  24 use chain::transaction::OutPoint;
  25 use ln::channel::{Channel, ChannelError};
  26 use ln::channelmonitor::{ChannelMonitor, ChannelMonitorUpdateErr, ManyChannelMonitor, CLTV_CLAIM_BUFFER, HTLC_FAIL_TIMEOUT_BLOCKS};
  27 use ln::router::{Route,RouteHop};
  28 use ln::msgs;
  29 use ln::msgs::{ChannelMessageHandler, DecodeError, HandleError};
  30 use chain::keysinterface::KeysInterface;
  31 use util::config::UserConfig;
  32 use util::{byte_utils, events, internal_traits, rng};
  33 use util::sha2::Sha256;
  34 use util::ser::{Readable, ReadableArgs, Writeable, Writer};
  35 use util::chacha20poly1305rfc::ChaCha20;
  36 use util::logger::Logger;
  37 use util::errors::APIError;
  38
  39 use crypto;
  40 use crypto::mac::{Mac,MacResult};
  41 use crypto::hmac::Hmac;
  42 use crypto::digest::Digest;
  43 use crypto::symmetriccipher::SynchronousStreamCipher;
  44
  45 use std::{cmp, ptr, mem};
  46 use std::collections::{HashMap, hash_map, HashSet};
  47 use std::io::Cursor;
  48 use std::sync::{Arc, Mutex, MutexGuard, RwLock};
  49 use std::sync::atomic::{AtomicUsize, Ordering};
  50 use std::time::{Instant,Duration};
  51
  52 /// We hold various information about HTLC relay in the HTLC objects in Channel itself:
  53 ///
  54 /// Upon receipt of an HTLC from a peer, we'll give it a PendingHTLCStatus indicating if it should
  55 /// forward the HTLC with information it will give back to us when it does so, or if it should Fail
  56 /// the HTLC with the relevant message for the Channel to handle giving to the remote peer.
  57 ///
  58 /// When a Channel forwards an HTLC to its peer, it will give us back the PendingForwardHTLCInfo
  59 /// which we will use to construct an outbound HTLC, with a relevant HTLCSource::PreviousHopData
  60 /// filled in to indicate where it came from (which we can use to either fail-backwards or fulfill
  61 /// the HTLC backwards along the relevant path).
  62 /// Alternatively, we can fill an outbound HTLC with a HTLCSource::OutboundRoute indicating this is
  63 /// our payment, which we can use to decode errors or inform the user that the payment was sent.
  64 mod channel_held_info {
  65         use ln::msgs;
  66         use ln::router::Route;
  67         use secp256k1::key::SecretKey;
  68
  69         /// Stores the info we will need to send when we want to forward an HTLC onwards
  70         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  71         pub struct PendingForwardHTLCInfo {
  72                 pub(super) onion_packet: Option<msgs::OnionPacket>,
  73                 pub(super) incoming_shared_secret: [u8; 32],
  74                 pub(super) payment_hash: [u8; 32],
  75                 pub(super) short_channel_id: u64,
  76                 pub(super) amt_to_forward: u64,
  77                 pub(super) outgoing_cltv_value: u32,
  78         }
  79
  80         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  81         pub enum HTLCFailureMsg {
  82                 Relay(msgs::UpdateFailHTLC),
  83                 Malformed(msgs::UpdateFailMalformedHTLC),
  84         }
  85
  86         /// Stores whether we can't forward an HTLC or relevant forwarding info
  87         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  88         pub enum PendingHTLCStatus {
  89                 Forward(PendingForwardHTLCInfo),
  90                 Fail(HTLCFailureMsg),
  91         }
  92
  93         /// Tracks the inbound corresponding to an outbound HTLC
  94         #[derive(Clone)]
  95         pub struct HTLCPreviousHopData {
  96                 pub(super) short_channel_id: u64,
  97                 pub(super) htlc_id: u64,
  98                 pub(super) incoming_packet_shared_secret: [u8; 32],
  99         }
 100
 101         /// Tracks the inbound corresponding to an outbound HTLC
 102         #[derive(Clone)]
 103         pub enum HTLCSource {
 104                 PreviousHopData(HTLCPreviousHopData),
 105                 OutboundRoute {
 106                         route: Route,
 107                         session_priv: SecretKey,
 108                         /// Technically we can recalculate this from the route, but we cache it here to avoid
 109                         /// doing a double-pass on route when we get a failure back
 110                         first_hop_htlc_msat: u64,
 111                 },
 112         }
 113         #[cfg(test)]
 114         impl HTLCSource {
 115                 pub fn dummy() -> Self {
 116                         HTLCSource::OutboundRoute {
 117                                 route: Route { hops: Vec::new() },
 118                                 session_priv: SecretKey::from_slice(&::secp256k1::Secp256k1::without_caps(), &[1; 32]).unwrap(),
 119                                 first_hop_htlc_msat: 0,
 120                         }
 121                 }
 122         }
 123
 124         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
 125         pub(crate) enum HTLCFailReason {
 126                 ErrorPacket {
 127                         err: msgs::OnionErrorPacket,
 128                 },
 129                 Reason {
 130                         failure_code: u16,
 131                         data: Vec<u8>,
 132                 }
 133         }
 134 }
 135 pub(super) use self::channel_held_info::*;
 136
 137 struct MsgHandleErrInternal {
 138         err: msgs::HandleError,
 139         needs_channel_force_close: bool,
 140 }
 141 impl MsgHandleErrInternal {
 142         #[inline]
 143         fn send_err_msg_no_close(err: &'static str, channel_id: [u8; 32]) -> Self {
 144                 Self {
 145                         err: HandleError {
 146                                 err,
 147                                 action: Some(msgs::ErrorAction::SendErrorMessage {
 148                                         msg: msgs::ErrorMessage {
 149                                                 channel_id,
 150                                                 data: err.to_string()
 151                                         },
 152                                 }),
 153                         },
 154                         needs_channel_force_close: false,
 155                 }
 156         }
 157         #[inline]
 158         fn send_err_msg_close_chan(err: &'static str, channel_id: [u8; 32]) -> Self {
 159                 Self {
 160                         err: HandleError {
 161                                 err,
 162                                 action: Some(msgs::ErrorAction::SendErrorMessage {
 163                                         msg: msgs::ErrorMessage {
 164                                                 channel_id,
 165                                                 data: err.to_string()
 166                                         },
 167                                 }),
 168                         },
 169                         needs_channel_force_close: true,
 170                 }
 171         }
 172         #[inline]
 173         fn from_maybe_close(err: msgs::HandleError) -> Self {
 174                 Self { err, needs_channel_force_close: true }
 175         }
 176         #[inline]
 177         fn from_no_close(err: msgs::HandleError) -> Self {
 178                 Self { err, needs_channel_force_close: false }
 179         }
 180         #[inline]
 181         fn from_chan_no_close(err: ChannelError, channel_id: [u8; 32]) -> Self {
 182                 Self {
 183                         err: match err {
 184                                 ChannelError::Ignore(msg) => HandleError {
 185                                         err: msg,
 186                                         action: Some(msgs::ErrorAction::IgnoreError),
 187                                 },
 188                                 ChannelError::Close(msg) => HandleError {
 189                                         err: msg,
 190                                         action: Some(msgs::ErrorAction::SendErrorMessage {
 191                                                 msg: msgs::ErrorMessage {
 192                                                         channel_id,
 193                                                         data: msg.to_string()
 194                                                 },
 195                                         }),
 196                                 },
 197                         },
 198                         needs_channel_force_close: false,
 199                 }
 200         }
 201         #[inline]
 202         fn from_chan_maybe_close(err: ChannelError, channel_id: [u8; 32]) -> Self {
 203                 Self {
 204                         err: match err {
 205                                 ChannelError::Ignore(msg) => HandleError {
 206                                         err: msg,
 207                                         action: Some(msgs::ErrorAction::IgnoreError),
 208                                 },
 209                                 ChannelError::Close(msg) => HandleError {
 210                                         err: msg,
 211                                         action: Some(msgs::ErrorAction::SendErrorMessage {
 212                                                 msg: msgs::ErrorMessage {
 213                                                         channel_id,
 214                                                         data: msg.to_string()
 215                                                 },
 216                                         }),
 217                                 },
 218                         },
 219                         needs_channel_force_close: true,
 220                 }
 221         }
 222 }
 223
 224 /// Pass to fail_htlc_backwwards to indicate the reason to fail the payment
 225 /// after a PaymentReceived event.
 226 #[derive(PartialEq)]
 227 pub enum PaymentFailReason {
 228         /// Indicate the preimage for payment_hash is not known after a PaymentReceived event
 229         PreimageUnknown,
 230         /// Indicate the payment amount is incorrect ( received is < expected or > 2*expected ) after a PaymentReceived event
 231         AmountMismatch,
 232 }
 233
 234 /// We hold back HTLCs we intend to relay for a random interval in the range (this, 5*this). This
 235 /// provides some limited amount of privacy. Ideally this would range from somewhere like 1 second
 236 /// to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly. We could
 237 /// probably increase this significantly.
 238 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u32 = 50;
 239
 240 struct HTLCForwardInfo {
 241         prev_short_channel_id: u64,
 242         prev_htlc_id: u64,
 243         forward_info: PendingForwardHTLCInfo,
 244 }
 245
 246 /// For events which result in both a RevokeAndACK and a CommitmentUpdate, by default they should
 247 /// be sent in the order they appear in the return value, however sometimes the order needs to be
 248 /// variable at runtime (eg Channel::channel_reestablish needs to re-send messages in the order
 249 /// they were originally sent). In those cases, this enum is also returned.
 250 #[derive(Clone, PartialEq)]
 251 pub(super) enum RAACommitmentOrder {
 252         /// Send the CommitmentUpdate messages first
 253         CommitmentFirst,
 254         /// Send the RevokeAndACK message first
 255         RevokeAndACKFirst,
 256 }
 257
 258 struct ChannelHolder {
 259         by_id: HashMap<[u8; 32], Channel>,
 260         short_to_id: HashMap<u64, [u8; 32]>,
 261         next_forward: Instant,
 262         /// short channel id -> forward infos. Key of 0 means payments received
 263         /// Note that while this is held in the same mutex as the channels themselves, no consistency
 264         /// guarantees are made about there existing a channel with the short id here, nor the short
 265         /// ids in the PendingForwardHTLCInfo!
 266         forward_htlcs: HashMap<u64, Vec<HTLCForwardInfo>>,
 267         /// Note that while this is held in the same mutex as the channels themselves, no consistency
 268         /// guarantees are made about the channels given here actually existing anymore by the time you
 269         /// go to read them!
 270         claimable_htlcs: HashMap<[u8; 32], Vec<HTLCPreviousHopData>>,
 271         /// Messages to send to peers - pushed to in the same lock that they are generated in (except
 272         /// for broadcast messages, where ordering isn't as strict).
 273         pending_msg_events: Vec<events::MessageSendEvent>,
 274 }
 275 struct MutChannelHolder<'a> {
 276         by_id: &'a mut HashMap<[u8; 32], Channel>,
 277         short_to_id: &'a mut HashMap<u64, [u8; 32]>,
 278         next_forward: &'a mut Instant,
 279         forward_htlcs: &'a mut HashMap<u64, Vec<HTLCForwardInfo>>,
 280         claimable_htlcs: &'a mut HashMap<[u8; 32], Vec<HTLCPreviousHopData>>,
 281         pending_msg_events: &'a mut Vec<events::MessageSendEvent>,
 282 }
 283 impl ChannelHolder {
 284         fn borrow_parts(&mut self) -> MutChannelHolder {
 285                 MutChannelHolder {
 286                         by_id: &mut self.by_id,
 287                         short_to_id: &mut self.short_to_id,
 288                         next_forward: &mut self.next_forward,
 289                         forward_htlcs: &mut self.forward_htlcs,
 290                         claimable_htlcs: &mut self.claimable_htlcs,
 291                         pending_msg_events: &mut self.pending_msg_events,
 292                 }
 293         }
 294 }
 295
 296 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
 297 const ERR: () = "You need at least 32 bit pointers (well, usize, but we'll assume they're the same) for ChannelManager::latest_block_height";
 298
 299 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 300 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
 301 ///
 302 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
 303 /// to individual Channels.
 304 ///
 305 /// Implements Writeable to write out all channel state to disk. Implies peer_disconnected() for
 306 /// all peers during write/read (though does not modify this instance, only the instance being
 307 /// serialized). This will result in any channels which have not yet exchanged funding_created (ie
 308 /// called funding_transaction_generated for outbound channels).
 309 ///
 310 /// Note that you can be a bit lazier about writing out ChannelManager than you can be with
 311 /// ChannelMonitors. With ChannelMonitors you MUST write each monitor update out to disk before
 312 /// returning from ManyChannelMonitor::add_update_monitor, with ChannelManagers, writing updates
 313 /// happens out-of-band (and will prevent any other ChannelManager operations from occurring during
 314 /// the serialization process). If the deserialized version is out-of-date compared to the
 315 /// ChannelMonitors passed by reference to read(), those channels will be force-closed based on the
 316 /// ChannelMonitor state and no funds will be lost (mod on-chain transaction fees).
 317 ///
 318 /// Note that the deserializer is only implemented for (Sha256dHash, ChannelManager), which
 319 /// tells you the last block hash which was block_connect()ed. You MUST rescan any blocks along
 320 /// the "reorg path" (ie call block_disconnected() until you get to a common block and then call
 321 /// block_connected() to step towards your best block) upon deserialization before using the
 322 /// object!
 323 pub struct ChannelManager {
 324         default_configuration: UserConfig,
 325         genesis_hash: Sha256dHash,
 326         fee_estimator: Arc<FeeEstimator>,
 327         monitor: Arc<ManyChannelMonitor>,
 328         chain_monitor: Arc<ChainWatchInterface>,
 329         tx_broadcaster: Arc<BroadcasterInterface>,
 330
 331         latest_block_height: AtomicUsize,
 332         last_block_hash: Mutex<Sha256dHash>,
 333         secp_ctx: Secp256k1<secp256k1::All>,
 334
 335         channel_state: Mutex<ChannelHolder>,
 336         our_network_key: SecretKey,
 337
 338         pending_events: Mutex<Vec<events::Event>>,
 339         /// Used when we have to take a BIG lock to make sure everything is self-consistent.
 340         /// Essentially just when we're serializing ourselves out.
 341         /// Taken first everywhere where we are making changes before any other locks.
 342         total_consistency_lock: RwLock<()>,
 343
 344         keys_manager: Arc<KeysInterface>,
 345
 346         logger: Arc<Logger>,
 347 }
 348
 349 /// The minimum number of blocks between an inbound HTLC's CLTV and the corresponding outbound
 350 /// HTLC's CLTV. This should always be a few blocks greater than channelmonitor::CLTV_CLAIM_BUFFER,
 351 /// ie the node we forwarded the payment on to should always have enough room to reliably time out
 352 /// the HTLC via a full update_fail_htlc/commitment_signed dance before we hit the
 353 /// CLTV_CLAIM_BUFFER point (we static assert that its at least 3 blocks more).
 354 const CLTV_EXPIRY_DELTA: u16 = 6 * 24 * 2; //TODO?
 355 const CLTV_FAR_FAR_AWAY: u32 = 6 * 24 * 7; //TODO?
 356
 357 // Check that our CLTV_EXPIRY is at least CLTV_CLAIM_BUFFER + 2*HTLC_FAIL_TIMEOUT_BLOCKS, ie that
 358 // if the next-hop peer fails the HTLC within HTLC_FAIL_TIMEOUT_BLOCKS then we'll still have
 359 // HTLC_FAIL_TIMEOUT_BLOCKS left to fail it backwards ourselves before hitting the
 360 // CLTV_CLAIM_BUFFER point and failing the channel on-chain to time out the HTLC.
 361 #[deny(const_err)]
 362 #[allow(dead_code)]
 363 const CHECK_CLTV_EXPIRY_SANITY: u32 = CLTV_EXPIRY_DELTA as u32 - 2*HTLC_FAIL_TIMEOUT_BLOCKS - CLTV_CLAIM_BUFFER;
 364
 365 // Check for ability of an attacker to make us fail on-chain by delaying inbound claim. See
 366 // ChannelMontior::would_broadcast_at_height for a description of why this is needed.
 367 #[deny(const_err)]
 368 #[allow(dead_code)]
 369 const CHECK_CLTV_EXPIRY_SANITY_2: u32 = CLTV_EXPIRY_DELTA as u32 - HTLC_FAIL_TIMEOUT_BLOCKS - 2*CLTV_CLAIM_BUFFER;
 370
 371 macro_rules! secp_call {
 372         ( $res: expr, $err: expr ) => {
 373                 match $res {
 374                         Ok(key) => key,
 375                         Err(_) => return Err($err),
 376                 }
 377         };
 378 }
 379
 380 struct OnionKeys {
 381         #[cfg(test)]
 382         shared_secret: SharedSecret,
 383         #[cfg(test)]
 384         blinding_factor: [u8; 32],
 385         ephemeral_pubkey: PublicKey,
 386         rho: [u8; 32],
 387         mu: [u8; 32],
 388 }
 389
 390 /// Details of a channel, as returned by ChannelManager::list_channels and ChannelManager::list_usable_channels
 391 pub struct ChannelDetails {
 392         /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
 393         /// thereafter this is the txid of the funding transaction xor the funding transaction output).
 394         /// Note that this means this value is *not* persistent - it can change once during the
 395         /// lifetime of the channel.
 396         pub channel_id: [u8; 32],
 397         /// The position of the funding transaction in the chain. None if the funding transaction has
 398         /// not yet been confirmed and the channel fully opened.
 399         pub short_channel_id: Option<u64>,
 400         /// The node_id of our counterparty
 401         pub remote_network_id: PublicKey,
 402         /// The value, in satoshis, of this channel as appears in the funding output
 403         pub channel_value_satoshis: u64,
 404         /// The user_id passed in to create_channel, or 0 if the channel was inbound.
 405         pub user_id: u64,
 406 }
 407
 408 impl ChannelManager {
 409         /// Constructs a new ChannelManager to hold several channels and route between them.
 410         ///
 411         /// This is the main "logic hub" for all channel-related actions, and implements
 412         /// ChannelMessageHandler.
 413         ///
 414         /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
 415         ///
 416         /// panics if channel_value_satoshis is >= `MAX_FUNDING_SATOSHIS`!
 417         pub fn new(network: Network, feeest: Arc<FeeEstimator>, monitor: Arc<ManyChannelMonitor>, chain_monitor: Arc<ChainWatchInterface>, tx_broadcaster: Arc<BroadcasterInterface>, logger: Arc<Logger>,keys_manager: Arc<KeysInterface>, config: UserConfig) -> Result<Arc<ChannelManager>, secp256k1::Error> {
 418                 let secp_ctx = Secp256k1::new();
 419
 420                 let res = Arc::new(ChannelManager {
 421                         default_configuration: config.clone(),
 422                         genesis_hash: genesis_block(network).header.bitcoin_hash(),
 423                         fee_estimator: feeest.clone(),
 424                         monitor: monitor.clone(),
 425                         chain_monitor,
 426                         tx_broadcaster,
 427
 428                         latest_block_height: AtomicUsize::new(0), //TODO: Get an init value
 429                         last_block_hash: Mutex::new(Default::default()),
 430                         secp_ctx,
 431
 432                         channel_state: Mutex::new(ChannelHolder{
 433                                 by_id: HashMap::new(),
 434                                 short_to_id: HashMap::new(),
 435                                 next_forward: Instant::now(),
 436                                 forward_htlcs: HashMap::new(),
 437                                 claimable_htlcs: HashMap::new(),
 438                                 pending_msg_events: Vec::new(),
 439                         }),
 440                         our_network_key: keys_manager.get_node_secret(),
 441
 442                         pending_events: Mutex::new(Vec::new()),
 443                         total_consistency_lock: RwLock::new(()),
 444
 445                         keys_manager,
 446
 447                         logger,
 448                 });
 449                 let weak_res = Arc::downgrade(&res);
 450                 res.chain_monitor.register_listener(weak_res);
 451                 Ok(res)
 452         }
 453
 454         /// Creates a new outbound channel to the given remote node and with the given value.
 455         ///
 456         /// user_id will be provided back as user_channel_id in FundingGenerationReady and
 457         /// FundingBroadcastSafe events to allow tracking of which events correspond with which
 458         /// create_channel call. Note that user_channel_id defaults to 0 for inbound channels, so you
 459         /// may wish to avoid using 0 for user_id here.
 460         ///
 461         /// If successful, will generate a SendOpenChannel message event, so you should probably poll
 462         /// PeerManager::process_events afterwards.
 463         ///
 464         /// Raises APIError::APIMisuseError when channel_value_satoshis > 2**24 or push_msat is
 465         /// greater than channel_value_satoshis * 1k or channel_value_satoshis is < 1000.
 466         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, push_msat: u64, user_id: u64) -> Result<(), APIError> {
 467                 if channel_value_satoshis < 1000 {
 468                         return Err(APIError::APIMisuseError { err: "channel_value must be at least 1000 satoshis" });
 469                 }
 470
 471                 let channel = Channel::new_outbound(&*self.fee_estimator, &self.keys_manager, their_network_key, channel_value_satoshis, push_msat, user_id, Arc::clone(&self.logger), &self.default_configuration)?;
 472                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator);
 473
 474                 let _ = self.total_consistency_lock.read().unwrap();
 475                 let mut channel_state = self.channel_state.lock().unwrap();
 476                 match channel_state.by_id.entry(channel.channel_id()) {
 477                         hash_map::Entry::Occupied(_) => {
 478                                 if cfg!(feature = "fuzztarget") {
 479                                         return Err(APIError::APIMisuseError { err: "Fuzzy bad RNG" });
 480                                 } else {
 481                                         panic!("RNG is bad???");
 482                                 }
 483                         },
 484                         hash_map::Entry::Vacant(entry) => { entry.insert(channel); }
 485                 }
 486                 channel_state.pending_msg_events.push(events::MessageSendEvent::SendOpenChannel {
 487                         node_id: their_network_key,
 488                         msg: res,
 489                 });
 490                 Ok(())
 491         }
 492
 493         /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
 494         /// more information.
 495         pub fn list_channels(&self) -> Vec<ChannelDetails> {
 496                 let channel_state = self.channel_state.lock().unwrap();
 497                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 498                 for (channel_id, channel) in channel_state.by_id.iter() {
 499                         res.push(ChannelDetails {
 500                                 channel_id: (*channel_id).clone(),
 501                                 short_channel_id: channel.get_short_channel_id(),
 502                                 remote_network_id: channel.get_their_node_id(),
 503                                 channel_value_satoshis: channel.get_value_satoshis(),
 504                                 user_id: channel.get_user_id(),
 505                         });
 506                 }
 507                 res
 508         }
 509
 510         /// Gets the list of usable channels, in random order. Useful as an argument to
 511         /// Router::get_route to ensure non-announced channels are used.
 512         pub fn list_usable_channels(&self) -> Vec<ChannelDetails> {
 513                 let channel_state = self.channel_state.lock().unwrap();
 514                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 515                 for (channel_id, channel) in channel_state.by_id.iter() {
 516                         // Note we use is_live here instead of usable which leads to somewhat confused
 517                         // internal/external nomenclature, but that's ok cause that's probably what the user
 518                         // really wanted anyway.
 519                         if channel.is_live() {
 520                                 res.push(ChannelDetails {
 521                                         channel_id: (*channel_id).clone(),
 522                                         short_channel_id: channel.get_short_channel_id(),
 523                                         remote_network_id: channel.get_their_node_id(),
 524                                         channel_value_satoshis: channel.get_value_satoshis(),
 525                                         user_id: channel.get_user_id(),
 526                                 });
 527                         }
 528                 }
 529                 res
 530         }
 531
 532         /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
 533         /// will be accepted on the given channel, and after additional timeout/the closing of all
 534         /// pending HTLCs, the channel will be closed on chain.
 535         ///
 536         /// May generate a SendShutdown message event on success, which should be relayed.
 537         pub fn close_channel(&self, channel_id: &[u8; 32]) -> Result<(), APIError> {
 538                 let _ = self.total_consistency_lock.read().unwrap();
 539
 540                 let (mut failed_htlcs, chan_option) = {
 541                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 542                         let channel_state = channel_state_lock.borrow_parts();
 543                         match channel_state.by_id.entry(channel_id.clone()) {
 544                                 hash_map::Entry::Occupied(mut chan_entry) => {
 545                                         let (shutdown_msg, failed_htlcs) = chan_entry.get_mut().get_shutdown()?;
 546                                         channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
 547                                                 node_id: chan_entry.get().get_their_node_id(),
 548                                                 msg: shutdown_msg
 549                                         });
 550                                         if chan_entry.get().is_shutdown() {
 551                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
 552                                                         channel_state.short_to_id.remove(&short_id);
 553                                                 }
 554                                                 (failed_htlcs, Some(chan_entry.remove_entry().1))
 555                                         } else { (failed_htlcs, None) }
 556                                 },
 557                                 hash_map::Entry::Vacant(_) => return Err(APIError::ChannelUnavailable{err: "No such channel"})
 558                         }
 559                 };
 560                 for htlc_source in failed_htlcs.drain(..) {
 561                         // unknown_next_peer...I dunno who that is anymore....
 562                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source.0, &htlc_source.1, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 563                 }
 564                 let chan_update = if let Some(chan) = chan_option {
 565                         if let Ok(update) = self.get_channel_update(&chan) {
 566                                 Some(update)
 567                         } else { None }
 568                 } else { None };
 569
 570                 if let Some(update) = chan_update {
 571                         let mut channel_state = self.channel_state.lock().unwrap();
 572                         channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
 573                                 msg: update
 574                         });
 575                 }
 576
 577                 Ok(())
 578         }
 579
 580         #[inline]
 581         fn finish_force_close_channel(&self, shutdown_res: (Vec<Transaction>, Vec<(HTLCSource, [u8; 32])>)) {
 582                 let (local_txn, mut failed_htlcs) = shutdown_res;
 583                 for htlc_source in failed_htlcs.drain(..) {
 584                         // unknown_next_peer...I dunno who that is anymore....
 585                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source.0, &htlc_source.1, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 586                 }
 587                 for tx in local_txn {
 588                         self.tx_broadcaster.broadcast_transaction(&tx);
 589                 }
 590                 //TODO: We need to have a way where outbound HTLC claims can result in us claiming the
 591                 //now-on-chain HTLC output for ourselves (and, thereafter, passing the HTLC backwards).
 592                 //TODO: We need to handle monitoring of pending offered HTLCs which just hit the chain and
 593                 //may be claimed, resulting in us claiming the inbound HTLCs (and back-failing after
 594                 //timeouts are hit and our claims confirm).
 595                 //TODO: In any case, we need to make sure we remove any pending htlc tracking (via
 596                 //fail_backwards or claim_funds) eventually for all HTLCs that were in the channel
 597         }
 598
 599         /// Force closes a channel, immediately broadcasting the latest local commitment transaction to
 600         /// the chain and rejecting new HTLCs on the given channel.
 601         pub fn force_close_channel(&self, channel_id: &[u8; 32]) {
 602                 let _ = self.total_consistency_lock.read().unwrap();
 603
 604                 let mut chan = {
 605                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 606                         let channel_state = channel_state_lock.borrow_parts();
 607                         if let Some(chan) = channel_state.by_id.remove(channel_id) {
 608                                 if let Some(short_id) = chan.get_short_channel_id() {
 609                                         channel_state.short_to_id.remove(&short_id);
 610                                 }
 611                                 chan
 612                         } else {
 613                                 return;
 614                         }
 615                 };
 616                 self.finish_force_close_channel(chan.force_shutdown());
 617                 if let Ok(update) = self.get_channel_update(&chan) {
 618                         let mut channel_state = self.channel_state.lock().unwrap();
 619                         channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
 620                                 msg: update
 621                         });
 622                 }
 623         }
 624
 625         /// Force close all channels, immediately broadcasting the latest local commitment transaction
 626         /// for each to the chain and rejecting new HTLCs on each.
 627         pub fn force_close_all_channels(&self) {
 628                 for chan in self.list_channels() {
 629                         self.force_close_channel(&chan.channel_id);
 630                 }
 631         }
 632
 633         fn handle_monitor_update_fail(&self, mut channel_state_lock: MutexGuard<ChannelHolder>, channel_id: &[u8; 32], err: ChannelMonitorUpdateErr, reason: RAACommitmentOrder) {
 634                 match err {
 635                         ChannelMonitorUpdateErr::PermanentFailure => {
 636                                 let mut chan = {
 637                                         let channel_state = channel_state_lock.borrow_parts();
 638                                         let chan = channel_state.by_id.remove(channel_id).expect("monitor_update_failed must be called within the same lock as the channel get!");
 639                                         if let Some(short_id) = chan.get_short_channel_id() {
 640                                                 channel_state.short_to_id.remove(&short_id);
 641                                         }
 642                                         chan
 643                                 };
 644                                 mem::drop(channel_state_lock);
 645                                 self.finish_force_close_channel(chan.force_shutdown());
 646                                 if let Ok(update) = self.get_channel_update(&chan) {
 647                                         let mut channel_state = self.channel_state.lock().unwrap();
 648                                         channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
 649                                                 msg: update
 650                                         });
 651                                 }
 652                         },
 653                         ChannelMonitorUpdateErr::TemporaryFailure => {
 654                                 let channel = channel_state_lock.by_id.get_mut(channel_id).expect("monitor_update_failed must be called within the same lock as the channel get!");
 655                                 channel.monitor_update_failed(reason);
 656                         },
 657                 }
 658         }
 659
 660         #[inline]
 661         fn gen_rho_mu_from_shared_secret(shared_secret: &[u8]) -> ([u8; 32], [u8; 32]) {
 662                 assert_eq!(shared_secret.len(), 32);
 663                 ({
 664                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 665                         hmac.input(&shared_secret[..]);
 666                         let mut res = [0; 32];
 667                         hmac.raw_result(&mut res);
 668                         res
 669                 },
 670                 {
 671                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 672                         hmac.input(&shared_secret[..]);
 673                         let mut res = [0; 32];
 674                         hmac.raw_result(&mut res);
 675                         res
 676                 })
 677         }
 678
 679         #[inline]
 680         fn gen_um_from_shared_secret(shared_secret: &[u8]) -> [u8; 32] {
 681                 assert_eq!(shared_secret.len(), 32);
 682                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 683                 hmac.input(&shared_secret[..]);
 684                 let mut res = [0; 32];
 685                 hmac.raw_result(&mut res);
 686                 res
 687         }
 688
 689         #[inline]
 690         fn gen_ammag_from_shared_secret(shared_secret: &[u8]) -> [u8; 32] {
 691                 assert_eq!(shared_secret.len(), 32);
 692                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 693                 hmac.input(&shared_secret[..]);
 694                 let mut res = [0; 32];
 695                 hmac.raw_result(&mut res);
 696                 res
 697         }
 698
 699         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 700         #[inline]
 701         fn construct_onion_keys_callback<T: secp256k1::Signing, FType: FnMut(SharedSecret, [u8; 32], PublicKey, &RouteHop)> (secp_ctx: &Secp256k1<T>, route: &Route, session_priv: &SecretKey, mut callback: FType) -> Result<(), secp256k1::Error> {
 702                 let mut blinded_priv = session_priv.clone();
 703                 let mut blinded_pub = PublicKey::from_secret_key(secp_ctx, &blinded_priv);
 704
 705                 for hop in route.hops.iter() {
 706                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 707
 708                         let mut sha = Sha256::new();
 709                         sha.input(&blinded_pub.serialize()[..]);
 710                         sha.input(&shared_secret[..]);
 711                         let mut blinding_factor = [0u8; 32];
 712                         sha.result(&mut blinding_factor);
 713
 714                         let ephemeral_pubkey = blinded_pub;
 715
 716                         blinded_priv.mul_assign(secp_ctx, &SecretKey::from_slice(secp_ctx, &blinding_factor)?)?;
 717                         blinded_pub = PublicKey::from_secret_key(secp_ctx, &blinded_priv);
 718
 719                         callback(shared_secret, blinding_factor, ephemeral_pubkey, hop);
 720                 }
 721
 722                 Ok(())
 723         }
 724
 725         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 726         fn construct_onion_keys<T: secp256k1::Signing>(secp_ctx: &Secp256k1<T>, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, secp256k1::Error> {
 727                 let mut res = Vec::with_capacity(route.hops.len());
 728
 729                 Self::construct_onion_keys_callback(secp_ctx, route, session_priv, |shared_secret, _blinding_factor, ephemeral_pubkey, _| {
 730                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret[..]);
 731
 732                         res.push(OnionKeys {
 733                                 #[cfg(test)]
 734                                 shared_secret,
 735                                 #[cfg(test)]
 736                                 blinding_factor: _blinding_factor,
 737                                 ephemeral_pubkey,
 738                                 rho,
 739                                 mu,
 740                         });
 741                 })?;
 742
 743                 Ok(res)
 744         }
 745
 746         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 747         fn build_onion_payloads(route: &Route, starting_htlc_offset: u32) -> Result<(Vec<msgs::OnionHopData>, u64, u32), APIError> {
 748                 let mut cur_value_msat = 0u64;
 749                 let mut cur_cltv = starting_htlc_offset;
 750                 let mut last_short_channel_id = 0;
 751                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 752                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 753                 unsafe { res.set_len(route.hops.len()); }
 754
 755                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 756                         // First hop gets special values so that it can check, on receipt, that everything is
 757                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 758                         // the intended recipient).
 759                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 760                         let cltv = if cur_cltv == starting_htlc_offset { hop.cltv_expiry_delta + starting_htlc_offset } else { cur_cltv };
 761                         res[idx] = msgs::OnionHopData {
 762                                 realm: 0,
 763                                 data: msgs::OnionRealm0HopData {
 764                                         short_channel_id: last_short_channel_id,
 765                                         amt_to_forward: value_msat,
 766                                         outgoing_cltv_value: cltv,
 767                                 },
 768                                 hmac: [0; 32],
 769                         };
 770                         cur_value_msat += hop.fee_msat;
 771                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 772                                 return Err(APIError::RouteError{err: "Channel fees overflowed?!"});
 773                         }
 774                         cur_cltv += hop.cltv_expiry_delta as u32;
 775                         if cur_cltv >= 500000000 {
 776                                 return Err(APIError::RouteError{err: "Channel CLTV overflowed?!"});
 777                         }
 778                         last_short_channel_id = hop.short_channel_id;
 779                 }
 780                 Ok((res, cur_value_msat, cur_cltv))
 781         }
 782
 783         #[inline]
 784         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 785                 unsafe {
 786                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 787                 }
 788                 for i in 0..65 {
 789                         arr[i] = 0;
 790                 }
 791         }
 792
 793         #[inline]
 794         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 795                 assert_eq!(dst.len(), src.len());
 796
 797                 for i in 0..dst.len() {
 798                         dst[i] ^= src[i];
 799                 }
 800         }
 801
 802         const ZERO:[u8; 21*65] = [0; 21*65];
 803         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: &[u8; 32]) -> msgs::OnionPacket {
 804                 let mut buf = Vec::with_capacity(21*65);
 805                 buf.resize(21*65, 0);
 806
 807                 let filler = {
 808                         let iters = payloads.len() - 1;
 809                         let end_len = iters * 65;
 810                         let mut res = Vec::with_capacity(end_len);
 811                         res.resize(end_len, 0);
 812
 813                         for (i, keys) in onion_keys.iter().enumerate() {
 814                                 if i == payloads.len() - 1 { continue; }
 815                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 816                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 817                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 818                         }
 819                         res
 820                 };
 821
 822                 let mut packet_data = [0; 20*65];
 823                 let mut hmac_res = [0; 32];
 824
 825                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 826                         ChannelManager::shift_arr_right(&mut packet_data);
 827                         payload.hmac = hmac_res;
 828                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 829
 830                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 831                         chacha.process(&packet_data, &mut buf[0..20*65]);
 832                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 833
 834                         if i == 0 {
 835                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 836                         }
 837
 838                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 839                         hmac.input(&packet_data);
 840                         hmac.input(&associated_data[..]);
 841                         hmac.raw_result(&mut hmac_res);
 842                 }
 843
 844                 msgs::OnionPacket{
 845                         version: 0,
 846                         public_key: Ok(onion_keys.first().unwrap().ephemeral_pubkey),
 847                         hop_data: packet_data,
 848                         hmac: hmac_res,
 849                 }
 850         }
 851
 852         /// Encrypts a failure packet. raw_packet can either be a
 853         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 854         fn encrypt_failure_packet(shared_secret: &[u8], raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 855                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 856
 857                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 858                 packet_crypted.resize(raw_packet.len(), 0);
 859                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 860                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 861                 msgs::OnionErrorPacket {
 862                         data: packet_crypted,
 863                 }
 864         }
 865
 866         fn build_failure_packet(shared_secret: &[u8], failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 867                 assert_eq!(shared_secret.len(), 32);
 868                 assert!(failure_data.len() <= 256 - 2);
 869
 870                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 871
 872                 let failuremsg = {
 873                         let mut res = Vec::with_capacity(2 + failure_data.len());
 874                         res.push(((failure_type >> 8) & 0xff) as u8);
 875                         res.push(((failure_type >> 0) & 0xff) as u8);
 876                         res.extend_from_slice(&failure_data[..]);
 877                         res
 878                 };
 879                 let pad = {
 880                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 881                         res.resize(256 - 2 - failure_data.len(), 0);
 882                         res
 883                 };
 884                 let mut packet = msgs::DecodedOnionErrorPacket {
 885                         hmac: [0; 32],
 886                         failuremsg: failuremsg,
 887                         pad: pad,
 888                 };
 889
 890                 let mut hmac = Hmac::new(Sha256::new(), &um);
 891                 hmac.input(&packet.encode()[32..]);
 892                 hmac.raw_result(&mut packet.hmac);
 893
 894                 packet
 895         }
 896
 897         #[inline]
 898         fn build_first_hop_failure_packet(shared_secret: &[u8], failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 899                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 900                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 901         }
 902
 903         fn decode_update_add_htlc_onion(&self, msg: &msgs::UpdateAddHTLC) -> (PendingHTLCStatus, MutexGuard<ChannelHolder>) {
 904                 macro_rules! get_onion_hash {
 905                         () => {
 906                                 {
 907                                         let mut sha = Sha256::new();
 908                                         sha.input(&msg.onion_routing_packet.hop_data);
 909                                         let mut onion_hash = [0; 32];
 910                                         sha.result(&mut onion_hash);
 911                                         onion_hash
 912                                 }
 913                         }
 914                 }
 915
 916                 if let Err(_) = msg.onion_routing_packet.public_key {
 917                         log_info!(self, "Failed to accept/forward incoming HTLC with invalid ephemeral pubkey");
 918                         return (PendingHTLCStatus::Fail(HTLCFailureMsg::Malformed(msgs::UpdateFailMalformedHTLC {
 919                                 channel_id: msg.channel_id,
 920                                 htlc_id: msg.htlc_id,
 921                                 sha256_of_onion: get_onion_hash!(),
 922                                 failure_code: 0x8000 | 0x4000 | 6,
 923                         })), self.channel_state.lock().unwrap());
 924                 }
 925
 926                 let shared_secret = {
 927                         let mut arr = [0; 32];
 928                         arr.copy_from_slice(&SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key.unwrap(), &self.our_network_key)[..]);
 929                         arr
 930                 };
 931                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 932
 933                 let mut channel_state = None;
 934                 macro_rules! return_err {
 935                         ($msg: expr, $err_code: expr, $data: expr) => {
 936                                 {
 937                                         log_info!(self, "Failed to accept/forward incoming HTLC: {}", $msg);
 938                                         if channel_state.is_none() {
 939                                                 channel_state = Some(self.channel_state.lock().unwrap());
 940                                         }
 941                                         return (PendingHTLCStatus::Fail(HTLCFailureMsg::Relay(msgs::UpdateFailHTLC {
 942                                                 channel_id: msg.channel_id,
 943                                                 htlc_id: msg.htlc_id,
 944                                                 reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
 945                                         })), channel_state.unwrap());
 946                                 }
 947                         }
 948                 }
 949
 950                 if msg.onion_routing_packet.version != 0 {
 951                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
 952                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
 953                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
 954                         //receiving node would have to brute force to figure out which version was put in the
 955                         //packet by the node that send us the message, in the case of hashing the hop_data, the
 956                         //node knows the HMAC matched, so they already know what is there...
 957                         return_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4, &get_onion_hash!());
 958                 }
 959
 960                 let mut hmac = Hmac::new(Sha256::new(), &mu);
 961                 hmac.input(&msg.onion_routing_packet.hop_data);
 962                 hmac.input(&msg.payment_hash);
 963                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
 964                         return_err!("HMAC Check failed", 0x8000 | 0x4000 | 5, &get_onion_hash!());
 965                 }
 966
 967                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
 968                 let next_hop_data = {
 969                         let mut decoded = [0; 65];
 970                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
 971                         match msgs::OnionHopData::read(&mut Cursor::new(&decoded[..])) {
 972                                 Err(err) => {
 973                                         let error_code = match err {
 974                                                 msgs::DecodeError::UnknownVersion => 0x4000 | 1, // unknown realm byte
 975                                                 _ => 0x2000 | 2, // Should never happen
 976                                         };
 977                                         return_err!("Unable to decode our hop data", error_code, &[0;0]);
 978                                 },
 979                                 Ok(msg) => msg
 980                         }
 981                 };
 982
 983                 let pending_forward_info = if next_hop_data.hmac == [0; 32] {
 984                                 // OUR PAYMENT!
 985                                 // final_expiry_too_soon
 986                                 if (msg.cltv_expiry as u64) < self.latest_block_height.load(Ordering::Acquire) as u64 + (CLTV_CLAIM_BUFFER + HTLC_FAIL_TIMEOUT_BLOCKS) as u64 {
 987                                         return_err!("The final CLTV expiry is too soon to handle", 17, &[0;0]);
 988                                 }
 989                                 // final_incorrect_htlc_amount
 990                                 if next_hop_data.data.amt_to_forward > msg.amount_msat {
 991                                         return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
 992                                 }
 993                                 // final_incorrect_cltv_expiry
 994                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
 995                                         return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
 996                                 }
 997
 998                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
 999                                 // message, however that would leak that we are the recipient of this payment, so
1000                                 // instead we stay symmetric with the forwarding case, only responding (after a
1001                                 // delay) once they've send us a commitment_signed!
1002
1003                                 PendingHTLCStatus::Forward(PendingForwardHTLCInfo {
1004                                         onion_packet: None,
1005                                         payment_hash: msg.payment_hash.clone(),
1006                                         short_channel_id: 0,
1007                                         incoming_shared_secret: shared_secret,
1008                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1009                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1010                                 })
1011                         } else {
1012                                 let mut new_packet_data = [0; 20*65];
1013                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
1014                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
1015
1016                                 let mut new_pubkey = msg.onion_routing_packet.public_key.unwrap();
1017
1018                                 let blinding_factor = {
1019                                         let mut sha = Sha256::new();
1020                                         sha.input(&new_pubkey.serialize()[..]);
1021                                         sha.input(&shared_secret);
1022                                         let mut res = [0u8; 32];
1023                                         sha.result(&mut res);
1024                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
1025                                                 Err(_) => {
1026                                                         return_err!("Blinding factor is an invalid private key", 0x8000 | 0x4000 | 6, &get_onion_hash!());
1027                                                 },
1028                                                 Ok(key) => key
1029                                         }
1030                                 };
1031
1032                                 if let Err(_) = new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
1033                                         return_err!("New blinding factor is an invalid private key", 0x8000 | 0x4000 | 6, &get_onion_hash!());
1034                                 }
1035
1036                                 let outgoing_packet = msgs::OnionPacket {
1037                                         version: 0,
1038                                         public_key: Ok(new_pubkey),
1039                                         hop_data: new_packet_data,
1040                                         hmac: next_hop_data.hmac.clone(),
1041                                 };
1042
1043                                 PendingHTLCStatus::Forward(PendingForwardHTLCInfo {
1044                                         onion_packet: Some(outgoing_packet),
1045                                         payment_hash: msg.payment_hash.clone(),
1046                                         short_channel_id: next_hop_data.data.short_channel_id,
1047                                         incoming_shared_secret: shared_secret,
1048                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1049                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1050                                 })
1051                         };
1052
1053                 channel_state = Some(self.channel_state.lock().unwrap());
1054                 if let &PendingHTLCStatus::Forward(PendingForwardHTLCInfo { ref onion_packet, ref short_channel_id, ref amt_to_forward, ref outgoing_cltv_value, .. }) = &pending_forward_info {
1055                         if onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
1056                                 let id_option = channel_state.as_ref().unwrap().short_to_id.get(&short_channel_id).cloned();
1057                                 let forwarding_id = match id_option {
1058                                         None => { // unknown_next_peer
1059                                                 return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
1060                                         },
1061                                         Some(id) => id.clone(),
1062                                 };
1063                                 if let Some((err, code, chan_update)) = loop {
1064                                         let chan = channel_state.as_mut().unwrap().by_id.get_mut(&forwarding_id).unwrap();
1065
1066                                         // Note that we could technically not return an error yet here and just hope
1067                                         // that the connection is reestablished or monitor updated by the time we get
1068                                         // around to doing the actual forward, but better to fail early if we can and
1069                                         // hopefully an attacker trying to path-trace payments cannot make this occur
1070                                         // on a small/per-node/per-channel scale.
1071                                         if !chan.is_live() { // channel_disabled
1072                                                 break Some(("Forwarding channel is not in a ready state.", 0x1000 | 20, Some(self.get_channel_update(chan).unwrap())));
1073                                         }
1074                                         if *amt_to_forward < chan.get_their_htlc_minimum_msat() { // amount_below_minimum
1075                                                 break Some(("HTLC amount was below the htlc_minimum_msat", 0x1000 | 11, Some(self.get_channel_update(chan).unwrap())));
1076                                         }
1077                                         let fee = amt_to_forward.checked_mul(chan.get_fee_proportional_millionths() as u64).and_then(|prop_fee| { (prop_fee / 1000000).checked_add(chan.get_our_fee_base_msat(&*self.fee_estimator) as u64) });
1078                                         if fee.is_none() || msg.amount_msat < fee.unwrap() || (msg.amount_msat - fee.unwrap()) < *amt_to_forward { // fee_insufficient
1079                                                 break Some(("Prior hop has deviated from specified fees parameters or origin node has obsolete ones", 0x1000 | 12, Some(self.get_channel_update(chan).unwrap())));
1080                                         }
1081                                         if (msg.cltv_expiry as u64) < (*outgoing_cltv_value) as u64 + CLTV_EXPIRY_DELTA as u64 { // incorrect_cltv_expiry
1082                                                 break Some(("Forwarding node has tampered with the intended HTLC values or origin node has an obsolete cltv_expiry_delta", 0x1000 | 13, Some(self.get_channel_update(chan).unwrap())));
1083                                         }
1084                                         let cur_height = self.latest_block_height.load(Ordering::Acquire) as u32 + 1;
1085                                         // We want to have at least HTLC_FAIL_TIMEOUT_BLOCKS to fail prior to going on chain CLAIM_BUFFER blocks before expiration
1086                                         if msg.cltv_expiry <= cur_height + CLTV_CLAIM_BUFFER + HTLC_FAIL_TIMEOUT_BLOCKS as u32 { // expiry_too_soon
1087                                                 break Some(("CLTV expiry is too close", 0x1000 | 14, Some(self.get_channel_update(chan).unwrap())));
1088                                         }
1089                                         if msg.cltv_expiry > cur_height + CLTV_FAR_FAR_AWAY as u32 { // expiry_too_far
1090                                                 break Some(("CLTV expiry is too far in the future", 21, None));
1091                                         }
1092                                         break None;
1093                                 }
1094                                 {
1095                                         let mut res = Vec::with_capacity(8 + 128);
1096                                         if code == 0x1000 | 11 || code == 0x1000 | 12 {
1097                                                 res.extend_from_slice(&byte_utils::be64_to_array(msg.amount_msat));
1098                                         }
1099                                         else if code == 0x1000 | 13 {
1100                                                 res.extend_from_slice(&byte_utils::be32_to_array(msg.cltv_expiry));
1101                                         }
1102                                         if let Some(chan_update) = chan_update {
1103                                                 res.extend_from_slice(&chan_update.encode_with_len()[..]);
1104                                         }
1105                                         return_err!(err, code, &res[..]);
1106                                 }
1107                         }
1108                 }
1109
1110                 (pending_forward_info, channel_state.unwrap())
1111         }
1112
1113         /// only fails if the channel does not yet have an assigned short_id
1114         /// May be called with channel_state already locked!
1115         fn get_channel_update(&self, chan: &Channel) -> Result<msgs::ChannelUpdate, HandleError> {
1116                 let short_channel_id = match chan.get_short_channel_id() {
1117                         None => return Err(HandleError{err: "Channel not yet established", action: None}),
1118                         Some(id) => id,
1119                 };
1120
1121                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).serialize()[..] < chan.get_their_node_id().serialize()[..];
1122
1123                 let unsigned = msgs::UnsignedChannelUpdate {
1124                         chain_hash: self.genesis_hash,
1125                         short_channel_id: short_channel_id,
1126                         timestamp: chan.get_channel_update_count(),
1127                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
1128                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
1129                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
1130                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
1131                         fee_proportional_millionths: chan.get_fee_proportional_millionths(),
1132                         excess_data: Vec::new(),
1133                 };
1134
1135                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
1136                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key);
1137
1138                 Ok(msgs::ChannelUpdate {
1139                         signature: sig,
1140                         contents: unsigned
1141                 })
1142         }
1143
1144         /// Sends a payment along a given route.
1145         ///
1146         /// Value parameters are provided via the last hop in route, see documentation for RouteHop
1147         /// fields for more info.
1148         ///
1149         /// Note that if the payment_hash already exists elsewhere (eg you're sending a duplicative
1150         /// payment), we don't do anything to stop you! We always try to ensure that if the provided
1151         /// next hop knows the preimage to payment_hash they can claim an additional amount as
1152         /// specified in the last hop in the route! Thus, you should probably do your own
1153         /// payment_preimage tracking (which you should already be doing as they represent "proof of
1154         /// payment") and prevent double-sends yourself.
1155         ///
1156         /// May generate a SendHTLCs message event on success, which should be relayed.
1157         ///
1158         /// Raises APIError::RoutError when invalid route or forward parameter
1159         /// (cltv_delta, fee, node public key) is specified
1160         pub fn send_payment(&self, route: Route, payment_hash: [u8; 32]) -> Result<(), APIError> {
1161                 if route.hops.len() < 1 || route.hops.len() > 20 {
1162                         return Err(APIError::RouteError{err: "Route didn't go anywhere/had bogus size"});
1163                 }
1164                 let our_node_id = self.get_our_node_id();
1165                 for (idx, hop) in route.hops.iter().enumerate() {
1166                         if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
1167                                 return Err(APIError::RouteError{err: "Route went through us but wasn't a simple rebalance loop to us"});
1168                         }
1169                 }
1170
1171                 let session_priv = SecretKey::from_slice(&self.secp_ctx, &{
1172                         let mut session_key = [0; 32];
1173                         rng::fill_bytes(&mut session_key);
1174                         session_key
1175                 }).expect("RNG is bad!");
1176
1177                 let cur_height = self.latest_block_height.load(Ordering::Acquire) as u32 + 1;
1178
1179                 let onion_keys = secp_call!(ChannelManager::construct_onion_keys(&self.secp_ctx, &route, &session_priv),
1180                                 APIError::RouteError{err: "Pubkey along hop was maliciously selected"});
1181                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route, cur_height)?;
1182                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, &payment_hash);
1183
1184                 let _ = self.total_consistency_lock.read().unwrap();
1185                 let mut channel_state = self.channel_state.lock().unwrap();
1186
1187                 let id = match channel_state.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
1188                         None => return Err(APIError::ChannelUnavailable{err: "No channel available with first hop!"}),
1189                         Some(id) => id.clone(),
1190                 };
1191
1192                 let res = {
1193                         let chan = channel_state.by_id.get_mut(&id).unwrap();
1194                         if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
1195                                 return Err(APIError::RouteError{err: "Node ID mismatch on first hop!"});
1196                         }
1197                         if chan.is_awaiting_monitor_update() {
1198                                 return Err(APIError::MonitorUpdateFailed);
1199                         }
1200                         if !chan.is_live() {
1201                                 return Err(APIError::ChannelUnavailable{err: "Peer for first hop currently disconnected!"});
1202                         }
1203                         chan.send_htlc_and_commit(htlc_msat, payment_hash.clone(), htlc_cltv, HTLCSource::OutboundRoute {
1204                                 route: route.clone(),
1205                                 session_priv: session_priv.clone(),
1206                                 first_hop_htlc_msat: htlc_msat,
1207                         }, onion_packet).map_err(|he| APIError::ChannelUnavailable{err: he.err})?
1208                 };
1209                 match res {
1210                         Some((update_add, commitment_signed, chan_monitor)) => {
1211                                 if let Err(e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1212                                         self.handle_monitor_update_fail(channel_state, &id, e, RAACommitmentOrder::CommitmentFirst);
1213                                         return Err(APIError::MonitorUpdateFailed);
1214                                 }
1215
1216                                 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
1217                                         node_id: route.hops.first().unwrap().pubkey,
1218                                         updates: msgs::CommitmentUpdate {
1219                                                 update_add_htlcs: vec![update_add],
1220                                                 update_fulfill_htlcs: Vec::new(),
1221                                                 update_fail_htlcs: Vec::new(),
1222                                                 update_fail_malformed_htlcs: Vec::new(),
1223                                                 update_fee: None,
1224                                                 commitment_signed,
1225                                         },
1226                                 });
1227                         },
1228                         None => {},
1229                 }
1230
1231                 Ok(())
1232         }
1233
1234         /// Call this upon creation of a funding transaction for the given channel.
1235         ///
1236         /// Note that ALL inputs in the transaction pointed to by funding_txo MUST spend SegWit outputs
1237         /// or your counterparty can steal your funds!
1238         ///
1239         /// Panics if a funding transaction has already been provided for this channel.
1240         ///
1241         /// May panic if the funding_txo is duplicative with some other channel (note that this should
1242         /// be trivially prevented by using unique funding transaction keys per-channel).
1243         pub fn funding_transaction_generated(&self, temporary_channel_id: &[u8; 32], funding_txo: OutPoint) {
1244                 let _ = self.total_consistency_lock.read().unwrap();
1245
1246                 let (chan, msg, chan_monitor) = {
1247                         let mut channel_state = self.channel_state.lock().unwrap();
1248                         match channel_state.by_id.remove(temporary_channel_id) {
1249                                 Some(mut chan) => {
1250                                         match chan.get_outbound_funding_created(funding_txo) {
1251                                                 Ok(funding_msg) => {
1252                                                         (chan, funding_msg.0, funding_msg.1)
1253                                                 },
1254                                                 Err(e) => {
1255                                                         log_error!(self, "Got bad signatures: {}!", e.err);
1256                                                         channel_state.pending_msg_events.push(events::MessageSendEvent::HandleError {
1257                                                                 node_id: chan.get_their_node_id(),
1258                                                                 action: e.action,
1259                                                         });
1260                                                         return;
1261                                                 },
1262                                         }
1263                                 },
1264                                 None => return
1265                         }
1266                 };
1267                 // Because we have exclusive ownership of the channel here we can release the channel_state
1268                 // lock before add_update_monitor
1269                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1270                         unimplemented!();
1271                 }
1272
1273                 let mut channel_state = self.channel_state.lock().unwrap();
1274                 channel_state.pending_msg_events.push(events::MessageSendEvent::SendFundingCreated {
1275                         node_id: chan.get_their_node_id(),
1276                         msg: msg,
1277                 });
1278                 match channel_state.by_id.entry(chan.channel_id()) {
1279                         hash_map::Entry::Occupied(_) => {
1280                                 panic!("Generated duplicate funding txid?");
1281                         },
1282                         hash_map::Entry::Vacant(e) => {
1283                                 e.insert(chan);
1284                         }
1285                 }
1286         }
1287
1288         fn get_announcement_sigs(&self, chan: &Channel) -> Option<msgs::AnnouncementSignatures> {
1289                 if !chan.should_announce() { return None }
1290
1291                 let (announcement, our_bitcoin_sig) = match chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone()) {
1292                         Ok(res) => res,
1293                         Err(_) => return None, // Only in case of state precondition violations eg channel is closing
1294                 };
1295                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1296                 let our_node_sig = self.secp_ctx.sign(&msghash, &self.our_network_key);
1297
1298                 Some(msgs::AnnouncementSignatures {
1299                         channel_id: chan.channel_id(),
1300                         short_channel_id: chan.get_short_channel_id().unwrap(),
1301                         node_signature: our_node_sig,
1302                         bitcoin_signature: our_bitcoin_sig,
1303                 })
1304         }
1305
1306         /// Processes HTLCs which are pending waiting on random forward delay.
1307         ///
1308         /// Should only really ever be called in response to an PendingHTLCsForwardable event.
1309         /// Will likely generate further events.
1310         pub fn process_pending_htlc_forwards(&self) {
1311                 let _ = self.total_consistency_lock.read().unwrap();
1312
1313                 let mut new_events = Vec::new();
1314                 let mut failed_forwards = Vec::new();
1315                 {
1316                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1317                         let channel_state = channel_state_lock.borrow_parts();
1318
1319                         if cfg!(not(feature = "fuzztarget")) && Instant::now() < *channel_state.next_forward {
1320                                 return;
1321                         }
1322
1323                         for (short_chan_id, mut pending_forwards) in channel_state.forward_htlcs.drain() {
1324                                 if short_chan_id != 0 {
1325                                         let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
1326                                                 Some(chan_id) => chan_id.clone(),
1327                                                 None => {
1328                                                         failed_forwards.reserve(pending_forwards.len());
1329                                                         for HTLCForwardInfo { prev_short_channel_id, prev_htlc_id, forward_info } in pending_forwards.drain(..) {
1330                                                                 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
1331                                                                         short_channel_id: prev_short_channel_id,
1332                                                                         htlc_id: prev_htlc_id,
1333                                                                         incoming_packet_shared_secret: forward_info.incoming_shared_secret,
1334                                                                 });
1335                                                                 failed_forwards.push((htlc_source, forward_info.payment_hash, 0x4000 | 10, None));
1336                                                         }
1337                                                         continue;
1338                                                 }
1339                                         };
1340                                         let forward_chan = &mut channel_state.by_id.get_mut(&forward_chan_id).unwrap();
1341
1342                                         let mut add_htlc_msgs = Vec::new();
1343                                         for HTLCForwardInfo { prev_short_channel_id, prev_htlc_id, forward_info } in pending_forwards.drain(..) {
1344                                                 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
1345                                                         short_channel_id: prev_short_channel_id,
1346                                                         htlc_id: prev_htlc_id,
1347                                                         incoming_packet_shared_secret: forward_info.incoming_shared_secret,
1348                                                 });
1349                                                 match forward_chan.send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, htlc_source.clone(), forward_info.onion_packet.unwrap()) {
1350                                                         Err(_e) => {
1351                                                                 let chan_update = self.get_channel_update(forward_chan).unwrap();
1352                                                                 failed_forwards.push((htlc_source, forward_info.payment_hash, 0x1000 | 7, Some(chan_update)));
1353                                                                 continue;
1354                                                         },
1355                                                         Ok(update_add) => {
1356                                                                 match update_add {
1357                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
1358                                                                         None => {
1359                                                                                 // Nothing to do here...we're waiting on a remote
1360                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
1361                                                                                 // will automatically handle building the update_add_htlc and
1362                                                                                 // commitment_signed messages when we can.
1363                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
1364                                                                                 // as we don't really want others relying on us relaying through
1365                                                                                 // this channel currently :/.
1366                                                                         }
1367                                                                 }
1368                                                         }
1369                                                 }
1370                                         }
1371
1372                                         if !add_htlc_msgs.is_empty() {
1373                                                 let (commitment_msg, monitor) = match forward_chan.send_commitment() {
1374                                                         Ok(res) => res,
1375                                                         Err(e) => {
1376                                                                 if let &Some(msgs::ErrorAction::DisconnectPeer{msg: Some(ref _err_msg)}) = &e.action {
1377                                                                 } else if let &Some(msgs::ErrorAction::SendErrorMessage{msg: ref _err_msg}) = &e.action {
1378                                                                 } else {
1379                                                                         panic!("Stated return value requirements in send_commitment() were not met");
1380                                                                 }
1381                                                                 //TODO: Handle...this is bad!
1382                                                                 continue;
1383                                                         },
1384                                                 };
1385                                                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1386                                                         unimplemented!();// but def dont push the event...
1387                                                 }
1388                                                 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
1389                                                         node_id: forward_chan.get_their_node_id(),
1390                                                         updates: msgs::CommitmentUpdate {
1391                                                                 update_add_htlcs: add_htlc_msgs,
1392                                                                 update_fulfill_htlcs: Vec::new(),
1393                                                                 update_fail_htlcs: Vec::new(),
1394                                                                 update_fail_malformed_htlcs: Vec::new(),
1395                                                                 update_fee: None,
1396                                                                 commitment_signed: commitment_msg,
1397                                                         },
1398                                                 });
1399                                         }
1400                                 } else {
1401                                         for HTLCForwardInfo { prev_short_channel_id, prev_htlc_id, forward_info } in pending_forwards.drain(..) {
1402                                                 let prev_hop_data = HTLCPreviousHopData {
1403                                                         short_channel_id: prev_short_channel_id,
1404                                                         htlc_id: prev_htlc_id,
1405                                                         incoming_packet_shared_secret: forward_info.incoming_shared_secret,
1406                                                 };
1407                                                 match channel_state.claimable_htlcs.entry(forward_info.payment_hash) {
1408                                                         hash_map::Entry::Occupied(mut entry) => entry.get_mut().push(prev_hop_data),
1409                                                         hash_map::Entry::Vacant(entry) => { entry.insert(vec![prev_hop_data]); },
1410                                                 };
1411                                                 new_events.push(events::Event::PaymentReceived {
1412                                                         payment_hash: forward_info.payment_hash,
1413                                                         amt: forward_info.amt_to_forward,
1414                                                 });
1415                                         }
1416                                 }
1417                         }
1418                 }
1419
1420                 for (htlc_source, payment_hash, failure_code, update) in failed_forwards.drain(..) {
1421                         match update {
1422                                 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source, &payment_hash, HTLCFailReason::Reason { failure_code, data: Vec::new() }),
1423                                 Some(chan_update) => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source, &payment_hash, HTLCFailReason::Reason { failure_code, data: chan_update.encode_with_len() }),
1424                         };
1425                 }
1426
1427                 if new_events.is_empty() { return }
1428                 let mut events = self.pending_events.lock().unwrap();
1429                 events.append(&mut new_events);
1430         }
1431
1432         /// Indicates that the preimage for payment_hash is unknown or the received amount is incorrect after a PaymentReceived event.
1433         pub fn fail_htlc_backwards(&self, payment_hash: &[u8; 32], reason: PaymentFailReason) -> bool {
1434                 let _ = self.total_consistency_lock.read().unwrap();
1435
1436                 let mut channel_state = Some(self.channel_state.lock().unwrap());
1437                 let removed_source = channel_state.as_mut().unwrap().claimable_htlcs.remove(payment_hash);
1438                 if let Some(mut sources) = removed_source {
1439                         for htlc_with_hash in sources.drain(..) {
1440                                 if channel_state.is_none() { channel_state = Some(self.channel_state.lock().unwrap()); }
1441                                 self.fail_htlc_backwards_internal(channel_state.take().unwrap(), HTLCSource::PreviousHopData(htlc_with_hash), payment_hash, HTLCFailReason::Reason { failure_code: if reason == PaymentFailReason::PreimageUnknown {0x4000 | 15} else {0x4000 | 16}, data: Vec::new() });
1442                         }
1443                         true
1444                 } else { false }
1445         }
1446
1447         /// Fails an HTLC backwards to the sender of it to us.
1448         /// Note that while we take a channel_state lock as input, we do *not* assume consistency here.
1449         /// There are several callsites that do stupid things like loop over a list of payment_hashes
1450         /// to fail and take the channel_state lock for each iteration (as we take ownership and may
1451         /// drop it). In other words, no assumptions are made that entries in claimable_htlcs point to
1452         /// still-available channels.
1453         fn fail_htlc_backwards_internal(&self, mut channel_state_lock: MutexGuard<ChannelHolder>, source: HTLCSource, payment_hash: &[u8; 32], onion_error: HTLCFailReason) {
1454                 match source {
1455                         HTLCSource::OutboundRoute { .. } => {
1456                                 mem::drop(channel_state_lock);
1457                                 if let &HTLCFailReason::ErrorPacket { ref err } = &onion_error {
1458                                         let (channel_update, payment_retryable) = self.process_onion_failure(&source, err.data.clone());
1459                                         if let Some(update) = channel_update {
1460                                                 self.channel_state.lock().unwrap().pending_msg_events.push(
1461                                                         events::MessageSendEvent::PaymentFailureNetworkUpdate {
1462                                                                 update,
1463                                                         }
1464                                                 );
1465                                         }
1466                                         self.pending_events.lock().unwrap().push(events::Event::PaymentFailed {
1467                                                 payment_hash: payment_hash.clone(),
1468                                                 rejected_by_dest: !payment_retryable,
1469                                         });
1470                                 } else {
1471                                         panic!("should have onion error packet here");
1472                                 }
1473                         },
1474                         HTLCSource::PreviousHopData(HTLCPreviousHopData { short_channel_id, htlc_id, incoming_packet_shared_secret }) => {
1475                                 let err_packet = match onion_error {
1476                                         HTLCFailReason::Reason { failure_code, data } => {
1477                                                 let packet = ChannelManager::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
1478                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
1479                                         },
1480                                         HTLCFailReason::ErrorPacket { err } => {
1481                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
1482                                         }
1483                                 };
1484
1485                                 let channel_state = channel_state_lock.borrow_parts();
1486
1487                                 let chan_id = match channel_state.short_to_id.get(&short_channel_id) {
1488                                         Some(chan_id) => chan_id.clone(),
1489                                         None => return
1490                                 };
1491
1492                                 let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
1493                                 match chan.get_update_fail_htlc_and_commit(htlc_id, err_packet) {
1494                                         Ok(Some((msg, commitment_msg, chan_monitor))) => {
1495                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1496                                                         unimplemented!();
1497                                                 }
1498                                                 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
1499                                                         node_id: chan.get_their_node_id(),
1500                                                         updates: msgs::CommitmentUpdate {
1501                                                                 update_add_htlcs: Vec::new(),
1502                                                                 update_fulfill_htlcs: Vec::new(),
1503                                                                 update_fail_htlcs: vec![msg],
1504                                                                 update_fail_malformed_htlcs: Vec::new(),
1505                                                                 update_fee: None,
1506                                                                 commitment_signed: commitment_msg,
1507                                                         },
1508                                                 });
1509                                         },
1510                                         Ok(None) => {},
1511                                         Err(_e) => {
1512                                                 //TODO: Do something with e?
1513                                                 return;
1514                                         },
1515                                 }
1516                         },
1517                 }
1518         }
1519
1520         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
1521         /// generating message events for the net layer to claim the payment, if possible. Thus, you
1522         /// should probably kick the net layer to go send messages if this returns true!
1523         ///
1524         /// May panic if called except in response to a PaymentReceived event.
1525         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
1526                 let mut sha = Sha256::new();
1527                 sha.input(&payment_preimage);
1528                 let mut payment_hash = [0; 32];
1529                 sha.result(&mut payment_hash);
1530
1531                 let _ = self.total_consistency_lock.read().unwrap();
1532
1533                 let mut channel_state = Some(self.channel_state.lock().unwrap());
1534                 let removed_source = channel_state.as_mut().unwrap().claimable_htlcs.remove(&payment_hash);
1535                 if let Some(mut sources) = removed_source {
1536                         for htlc_with_hash in sources.drain(..) {
1537                                 if channel_state.is_none() { channel_state = Some(self.channel_state.lock().unwrap()); }
1538                                 self.claim_funds_internal(channel_state.take().unwrap(), HTLCSource::PreviousHopData(htlc_with_hash), payment_preimage);
1539                         }
1540                         true
1541                 } else { false }
1542         }
1543         fn claim_funds_internal(&self, mut channel_state_lock: MutexGuard<ChannelHolder>, source: HTLCSource, payment_preimage: [u8; 32]) {
1544                 match source {
1545                         HTLCSource::OutboundRoute { .. } => {
1546                                 mem::drop(channel_state_lock);
1547                                 let mut pending_events = self.pending_events.lock().unwrap();
1548                                 pending_events.push(events::Event::PaymentSent {
1549                                         payment_preimage
1550                                 });
1551                         },
1552                         HTLCSource::PreviousHopData(HTLCPreviousHopData { short_channel_id, htlc_id, .. }) => {
1553                                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1554                                 let channel_state = channel_state_lock.borrow_parts();
1555
1556                                 let chan_id = match channel_state.short_to_id.get(&short_channel_id) {
1557                                         Some(chan_id) => chan_id.clone(),
1558                                         None => {
1559                                                 // TODO: There is probably a channel manager somewhere that needs to
1560                                                 // learn the preimage as the channel already hit the chain and that's
1561                                                 // why its missing.
1562                                                 return
1563                                         }
1564                                 };
1565
1566                                 let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
1567                                 match chan.get_update_fulfill_htlc_and_commit(htlc_id, payment_preimage) {
1568                                         Ok((msgs, monitor_option)) => {
1569                                                 if let Some(chan_monitor) = monitor_option {
1570                                                         if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1571                                                                 unimplemented!();// but def dont push the event...
1572                                                         }
1573                                                 }
1574                                                 if let Some((msg, commitment_signed)) = msgs {
1575                                                         channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
1576                                                                 node_id: chan.get_their_node_id(),
1577                                                                 updates: msgs::CommitmentUpdate {
1578                                                                         update_add_htlcs: Vec::new(),
1579                                                                         update_fulfill_htlcs: vec![msg],
1580                                                                         update_fail_htlcs: Vec::new(),
1581                                                                         update_fail_malformed_htlcs: Vec::new(),
1582                                                                         update_fee: None,
1583                                                                         commitment_signed,
1584                                                                 }
1585                                                         });
1586                                                 }
1587                                         },
1588                                         Err(_e) => {
1589                                                 // TODO: There is probably a channel manager somewhere that needs to
1590                                                 // learn the preimage as the channel may be about to hit the chain.
1591                                                 //TODO: Do something with e?
1592                                                 return
1593                                         },
1594                                 }
1595                         },
1596                 }
1597         }
1598
1599         /// Gets the node_id held by this ChannelManager
1600         pub fn get_our_node_id(&self) -> PublicKey {
1601                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key)
1602         }
1603
1604         /// Used to restore channels to normal operation after a
1605         /// ChannelMonitorUpdateErr::TemporaryFailure was returned from a channel monitor update
1606         /// operation.
1607         pub fn test_restore_channel_monitor(&self) {
1608                 let mut close_results = Vec::new();
1609                 let mut htlc_forwards = Vec::new();
1610                 let mut htlc_failures = Vec::new();
1611                 let _ = self.total_consistency_lock.read().unwrap();
1612
1613                 {
1614                         let mut channel_lock = self.channel_state.lock().unwrap();
1615                         let channel_state = channel_lock.borrow_parts();
1616                         let short_to_id = channel_state.short_to_id;
1617                         let pending_msg_events = channel_state.pending_msg_events;
1618                         channel_state.by_id.retain(|_, channel| {
1619                                 if channel.is_awaiting_monitor_update() {
1620                                         let chan_monitor = channel.channel_monitor();
1621                                         if let Err(e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1622                                                 match e {
1623                                                         ChannelMonitorUpdateErr::PermanentFailure => {
1624                                                                 if let Some(short_id) = channel.get_short_channel_id() {
1625                                                                         short_to_id.remove(&short_id);
1626                                                                 }
1627                                                                 close_results.push(channel.force_shutdown());
1628                                                                 if let Ok(update) = self.get_channel_update(&channel) {
1629                                                                         pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
1630                                                                                 msg: update
1631                                                                         });
1632                                                                 }
1633                                                                 false
1634                                                         },
1635                                                         ChannelMonitorUpdateErr::TemporaryFailure => true,
1636                                                 }
1637                                         } else {
1638                                                 let (raa, commitment_update, order, pending_forwards, mut pending_failures) = channel.monitor_updating_restored();
1639                                                 if !pending_forwards.is_empty() {
1640                                                         htlc_forwards.push((channel.get_short_channel_id().expect("We can't have pending forwards before funding confirmation"), pending_forwards));
1641                                                 }
1642                                                 htlc_failures.append(&mut pending_failures);
1643
1644                                                 macro_rules! handle_cs { () => {
1645                                                         if let Some(update) = commitment_update {
1646                                                                 pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
1647                                                                         node_id: channel.get_their_node_id(),
1648                                                                         updates: update,
1649                                                                 });
1650                                                         }
1651                                                 } }
1652                                                 macro_rules! handle_raa { () => {
1653                                                         if let Some(revoke_and_ack) = raa {
1654                                                                 pending_msg_events.push(events::MessageSendEvent::SendRevokeAndACK {
1655                                                                         node_id: channel.get_their_node_id(),
1656                                                                         msg: revoke_and_ack,
1657                                                                 });
1658                                                         }
1659                                                 } }
1660                                                 match order {
1661                                                         RAACommitmentOrder::CommitmentFirst => {
1662                                                                 handle_cs!();
1663                                                                 handle_raa!();
1664                                                         },
1665                                                         RAACommitmentOrder::RevokeAndACKFirst => {
1666                                                                 handle_raa!();
1667                                                                 handle_cs!();
1668                                                         },
1669                                                 }
1670                                                 true
1671                                         }
1672                                 } else { true }
1673                         });
1674                 }
1675
1676                 for failure in htlc_failures.drain(..) {
1677                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), failure.0, &failure.1, failure.2);
1678                 }
1679                 self.forward_htlcs(&mut htlc_forwards[..]);
1680
1681                 for res in close_results.drain(..) {
1682                         self.finish_force_close_channel(res);
1683                 }
1684         }
1685
1686         fn internal_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<(), MsgHandleErrInternal> {
1687                 if msg.chain_hash != self.genesis_hash {
1688                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Unknown genesis block hash", msg.temporary_channel_id.clone()));
1689                 }
1690
1691                 let channel = Channel::new_from_req(&*self.fee_estimator, &self.keys_manager, their_node_id.clone(), msg, 0, Arc::clone(&self.logger), &self.default_configuration)
1692                         .map_err(|e| MsgHandleErrInternal::from_chan_no_close(e, msg.temporary_channel_id))?;
1693                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1694                 let channel_state = channel_state_lock.borrow_parts();
1695                 match channel_state.by_id.entry(channel.channel_id()) {
1696                         hash_map::Entry::Occupied(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("temporary_channel_id collision!", msg.temporary_channel_id.clone())),
1697                         hash_map::Entry::Vacant(entry) => {
1698                                 channel_state.pending_msg_events.push(events::MessageSendEvent::SendAcceptChannel {
1699                                         node_id: their_node_id.clone(),
1700                                         msg: channel.get_accept_channel(),
1701                                 });
1702                                 entry.insert(channel);
1703                         }
1704                 }
1705                 Ok(())
1706         }
1707
1708         fn internal_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), MsgHandleErrInternal> {
1709                 let (value, output_script, user_id) = {
1710                         let mut channel_state = self.channel_state.lock().unwrap();
1711                         match channel_state.by_id.get_mut(&msg.temporary_channel_id) {
1712                                 Some(chan) => {
1713                                         if chan.get_their_node_id() != *their_node_id {
1714                                                 //TODO: see issue #153, need a consistent behavior on obnoxious behavior from random node
1715                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.temporary_channel_id));
1716                                         }
1717                                         chan.accept_channel(&msg, &self.default_configuration)
1718                                                 .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.temporary_channel_id))?;
1719                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
1720                                 },
1721                                 //TODO: same as above
1722                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.temporary_channel_id))
1723                         }
1724                 };
1725                 let mut pending_events = self.pending_events.lock().unwrap();
1726                 pending_events.push(events::Event::FundingGenerationReady {
1727                         temporary_channel_id: msg.temporary_channel_id,
1728                         channel_value_satoshis: value,
1729                         output_script: output_script,
1730                         user_channel_id: user_id,
1731                 });
1732                 Ok(())
1733         }
1734
1735         fn internal_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<(), MsgHandleErrInternal> {
1736                 let (chan, funding_msg, monitor_update) = {
1737                         let mut channel_state = self.channel_state.lock().unwrap();
1738                         match channel_state.by_id.entry(msg.temporary_channel_id.clone()) {
1739                                 hash_map::Entry::Occupied(mut chan) => {
1740                                         if chan.get().get_their_node_id() != *their_node_id {
1741                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1742                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.temporary_channel_id));
1743                                         }
1744                                         match chan.get_mut().funding_created(msg) {
1745                                                 Ok((funding_msg, monitor_update)) => {
1746                                                         (chan.remove(), funding_msg, monitor_update)
1747                                                 },
1748                                                 Err(e) => {
1749                                                         return Err(e).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))
1750                                                 }
1751                                         }
1752                                 },
1753                                 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.temporary_channel_id))
1754                         }
1755                 };
1756                 // Because we have exclusive ownership of the channel here we can release the channel_state
1757                 // lock before add_update_monitor
1758                 if let Err(_e) = self.monitor.add_update_monitor(monitor_update.get_funding_txo().unwrap(), monitor_update) {
1759                         unimplemented!();
1760                 }
1761                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1762                 let channel_state = channel_state_lock.borrow_parts();
1763                 match channel_state.by_id.entry(funding_msg.channel_id) {
1764                         hash_map::Entry::Occupied(_) => {
1765                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Already had channel with the new channel_id", funding_msg.channel_id))
1766                         },
1767                         hash_map::Entry::Vacant(e) => {
1768                                 channel_state.pending_msg_events.push(events::MessageSendEvent::SendFundingSigned {
1769                                         node_id: their_node_id.clone(),
1770                                         msg: funding_msg,
1771                                 });
1772                                 e.insert(chan);
1773                         }
1774                 }
1775                 Ok(())
1776         }
1777
1778         fn internal_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), MsgHandleErrInternal> {
1779                 let (funding_txo, user_id) = {
1780                         let mut channel_state = self.channel_state.lock().unwrap();
1781                         match channel_state.by_id.get_mut(&msg.channel_id) {
1782                                 Some(chan) => {
1783                                         if chan.get_their_node_id() != *their_node_id {
1784                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1785                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1786                                         }
1787                                         let chan_monitor = chan.funding_signed(&msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1788                                         if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1789                                                 unimplemented!();
1790                                         }
1791                                         (chan.get_funding_txo().unwrap(), chan.get_user_id())
1792                                 },
1793                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1794                         }
1795                 };
1796                 let mut pending_events = self.pending_events.lock().unwrap();
1797                 pending_events.push(events::Event::FundingBroadcastSafe {
1798                         funding_txo: funding_txo,
1799                         user_channel_id: user_id,
1800                 });
1801                 Ok(())
1802         }
1803
1804         fn internal_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<(), MsgHandleErrInternal> {
1805                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1806                 let channel_state = channel_state_lock.borrow_parts();
1807                 match channel_state.by_id.get_mut(&msg.channel_id) {
1808                         Some(chan) => {
1809                                 if chan.get_their_node_id() != *their_node_id {
1810                                         //TODO: here and below MsgHandleErrInternal, #153 case
1811                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1812                                 }
1813                                 chan.funding_locked(&msg)
1814                                         .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))?;
1815                                 if let Some(announcement_sigs) = self.get_announcement_sigs(chan) {
1816                                         channel_state.pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
1817                                                 node_id: their_node_id.clone(),
1818                                                 msg: announcement_sigs,
1819                                         });
1820                                 }
1821                                 Ok(())
1822                         },
1823                         None => Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1824                 }
1825         }
1826
1827         fn internal_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(), MsgHandleErrInternal> {
1828                 let (mut dropped_htlcs, chan_option) = {
1829                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1830                         let channel_state = channel_state_lock.borrow_parts();
1831
1832                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1833                                 hash_map::Entry::Occupied(mut chan_entry) => {
1834                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1835                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1836                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1837                                         }
1838                                         let (shutdown, closing_signed, dropped_htlcs) = chan_entry.get_mut().shutdown(&*self.fee_estimator, &msg).map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))?;
1839                                         if let Some(msg) = shutdown {
1840                                                 channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
1841                                                         node_id: their_node_id.clone(),
1842                                                         msg,
1843                                                 });
1844                                         }
1845                                         if let Some(msg) = closing_signed {
1846                                                 channel_state.pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
1847                                                         node_id: their_node_id.clone(),
1848                                                         msg,
1849                                                 });
1850                                         }
1851                                         if chan_entry.get().is_shutdown() {
1852                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1853                                                         channel_state.short_to_id.remove(&short_id);
1854                                                 }
1855                                                 (dropped_htlcs, Some(chan_entry.remove_entry().1))
1856                                         } else { (dropped_htlcs, None) }
1857                                 },
1858                                 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1859                         }
1860                 };
1861                 for htlc_source in dropped_htlcs.drain(..) {
1862                         // unknown_next_peer...I dunno who that is anymore....
1863                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source.0, &htlc_source.1, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
1864                 }
1865                 if let Some(chan) = chan_option {
1866                         if let Ok(update) = self.get_channel_update(&chan) {
1867                                 let mut channel_state = self.channel_state.lock().unwrap();
1868                                 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
1869                                         msg: update
1870                                 });
1871                         }
1872                 }
1873                 Ok(())
1874         }
1875
1876         fn internal_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<(), MsgHandleErrInternal> {
1877                 let (tx, chan_option) = {
1878                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1879                         let channel_state = channel_state_lock.borrow_parts();
1880                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1881                                 hash_map::Entry::Occupied(mut chan_entry) => {
1882                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1883                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1884                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1885                                         }
1886                                         let (closing_signed, tx) = chan_entry.get_mut().closing_signed(&*self.fee_estimator, &msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1887                                         if let Some(msg) = closing_signed {
1888                                                 channel_state.pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
1889                                                         node_id: their_node_id.clone(),
1890                                                         msg,
1891                                                 });
1892                                         }
1893                                         if tx.is_some() {
1894                                                 // We're done with this channel, we've got a signed closing transaction and
1895                                                 // will send the closing_signed back to the remote peer upon return. This
1896                                                 // also implies there are no pending HTLCs left on the channel, so we can
1897                                                 // fully delete it from tracking (the channel monitor is still around to
1898                                                 // watch for old state broadcasts)!
1899                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1900                                                         channel_state.short_to_id.remove(&short_id);
1901                                                 }
1902                                                 (tx, Some(chan_entry.remove_entry().1))
1903                                         } else { (tx, None) }
1904                                 },
1905                                 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1906                         }
1907                 };
1908                 if let Some(broadcast_tx) = tx {
1909                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1910                 }
1911                 if let Some(chan) = chan_option {
1912                         if let Ok(update) = self.get_channel_update(&chan) {
1913                                 let mut channel_state = self.channel_state.lock().unwrap();
1914                                 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
1915                                         msg: update
1916                                 });
1917                         }
1918                 }
1919                 Ok(())
1920         }
1921
1922         fn internal_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), MsgHandleErrInternal> {
1923                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
1924                 //determine the state of the payment based on our response/if we forward anything/the time
1925                 //we take to respond. We should take care to avoid allowing such an attack.
1926                 //
1927                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
1928                 //us repeatedly garbled in different ways, and compare our error messages, which are
1929                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
1930                 //but we should prevent it anyway.
1931
1932                 let (mut pending_forward_info, mut channel_state_lock) = self.decode_update_add_htlc_onion(msg);
1933                 let channel_state = channel_state_lock.borrow_parts();
1934
1935                 match channel_state.by_id.get_mut(&msg.channel_id) {
1936                         Some(chan) => {
1937                                 if chan.get_their_node_id() != *their_node_id {
1938                                         //TODO: here MsgHandleErrInternal, #153 case
1939                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1940                                 }
1941                                 if !chan.is_usable() {
1942                                         // If the update_add is completely bogus, the call will Err and we will close,
1943                                         // but if we've sent a shutdown and they haven't acknowledged it yet, we just
1944                                         // want to reject the new HTLC and fail it backwards instead of forwarding.
1945                                         if let PendingHTLCStatus::Forward(PendingForwardHTLCInfo { incoming_shared_secret, .. }) = pending_forward_info {
1946                                                 pending_forward_info = PendingHTLCStatus::Fail(HTLCFailureMsg::Relay(msgs::UpdateFailHTLC {
1947                                                         channel_id: msg.channel_id,
1948                                                         htlc_id: msg.htlc_id,
1949                                                         reason: ChannelManager::build_first_hop_failure_packet(&incoming_shared_secret, 0x1000|20, &self.get_channel_update(chan).unwrap().encode_with_len()[..]),
1950                                                 }));
1951                                         }
1952                                 }
1953                                 chan.update_add_htlc(&msg, pending_forward_info).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))
1954                         },
1955                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1956                 }
1957         }
1958
1959         fn internal_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), MsgHandleErrInternal> {
1960                 let mut channel_state = self.channel_state.lock().unwrap();
1961                 let htlc_source = match channel_state.by_id.get_mut(&msg.channel_id) {
1962                         Some(chan) => {
1963                                 if chan.get_their_node_id() != *their_node_id {
1964                                         //TODO: here and below MsgHandleErrInternal, #153 case
1965                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1966                                 }
1967                                 chan.update_fulfill_htlc(&msg)
1968                                         .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))?.clone()
1969                         },
1970                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1971                 };
1972                 self.claim_funds_internal(channel_state, htlc_source, msg.payment_preimage.clone());
1973                 Ok(())
1974         }
1975
1976         // Process failure we got back from upstream on a payment we sent. Returns update and a boolean
1977         // indicating that the payment itself failed
1978         fn process_onion_failure(&self, htlc_source: &HTLCSource, mut packet_decrypted: Vec<u8>) -> (Option<msgs::HTLCFailChannelUpdate>, bool) {
1979                 if let &HTLCSource::OutboundRoute { ref route, ref session_priv, ref first_hop_htlc_msat } = htlc_source {
1980                         macro_rules! onion_failure_log {
1981                                 ( $error_code_textual: expr, $error_code: expr, $reported_name: expr, $reported_value: expr ) => {
1982                                         log_trace!(self, "{}({:#x}) {}({})", $error_code_textual, $error_code, $reported_name, $reported_value);
1983                                 };
1984                                 ( $error_code_textual: expr, $error_code: expr ) => {
1985                                         log_trace!(self, "{}({})", $error_code_textual, $error_code);
1986                                 };
1987                         }
1988
1989                         const BADONION: u16 = 0x8000;
1990                         const PERM: u16 = 0x4000;
1991                         const UPDATE: u16 = 0x1000;
1992
1993                         let mut res = None;
1994                         let mut htlc_msat = *first_hop_htlc_msat;
1995
1996                         // Handle packed channel/node updates for passing back for the route handler
1997                         Self::construct_onion_keys_callback(&self.secp_ctx, route, session_priv, |shared_secret, _, _, route_hop| {
1998                                 if res.is_some() { return; }
1999
2000                                 let incoming_htlc_msat = htlc_msat;
2001                                 let amt_to_forward = htlc_msat - route_hop.fee_msat;
2002                                 htlc_msat = amt_to_forward;
2003
2004                                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret[..]);
2005
2006                                 let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len());
2007                                 decryption_tmp.resize(packet_decrypted.len(), 0);
2008                                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
2009                                 chacha.process(&packet_decrypted, &mut decryption_tmp[..]);
2010                                 packet_decrypted = decryption_tmp;
2011
2012                                 let is_from_final_node = route.hops.last().unwrap().pubkey == route_hop.pubkey;
2013
2014                                 if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::read(&mut Cursor::new(&packet_decrypted)) {
2015                                         let um = ChannelManager::gen_um_from_shared_secret(&shared_secret[..]);
2016                                         let mut hmac = Hmac::new(Sha256::new(), &um);
2017                                         hmac.input(&err_packet.encode()[32..]);
2018                                         let mut calc_tag = [0u8; 32];
2019                                         hmac.raw_result(&mut calc_tag);
2020
2021                                         if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) {
2022                                                 if err_packet.failuremsg.len() < 2 {
2023                                                         // Useless packet that we can't use but it passed HMAC, so it
2024                                                         // definitely came from the peer in question
2025                                                         res = Some((None, !is_from_final_node));
2026                                                 } else {
2027                                                         let error_code = byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]);
2028
2029                                                         match error_code & 0xff {
2030                                                                 1|2|3 => {
2031                                                                         // either from an intermediate or final node
2032                                                                         //   invalid_realm(PERM|1),
2033                                                                         //   temporary_node_failure(NODE|2)
2034                                                                         //   permanent_node_failure(PERM|NODE|2)
2035                                                                         //   required_node_feature_mssing(PERM|NODE|3)
2036                                                                         res = Some((Some(msgs::HTLCFailChannelUpdate::NodeFailure {
2037                                                                                 node_id: route_hop.pubkey,
2038                                                                                 is_permanent: error_code & PERM == PERM,
2039                                                                         }), !(error_code & PERM == PERM && is_from_final_node)));
2040                                                                         // node returning invalid_realm is removed from network_map,
2041                                                                         // although NODE flag is not set, TODO: or remove channel only?
2042                                                                         // retry payment when removed node is not a final node
2043                                                                         return;
2044                                                                 },
2045                                                                 _ => {}
2046                                                         }
2047
2048                                                         if is_from_final_node {
2049                                                                 let payment_retryable = match error_code {
2050                                                                         c if c == PERM|15 => false, // unknown_payment_hash
2051                                                                         c if c == PERM|16 => false, // incorrect_payment_amount
2052                                                                         17 => true, // final_expiry_too_soon
2053                                                                         18 if err_packet.failuremsg.len() == 6 => { // final_incorrect_cltv_expiry
2054                                                                                 let _reported_cltv_expiry = byte_utils::slice_to_be32(&err_packet.failuremsg[2..2+4]);
2055                                                                                 true
2056                                                                         },
2057                                                                         19 if err_packet.failuremsg.len() == 10 => { // final_incorrect_htlc_amount
2058                                                                                 let _reported_incoming_htlc_msat = byte_utils::slice_to_be64(&err_packet.failuremsg[2..2+8]);
2059                                                                                 true
2060                                                                         },
2061                                                                         _ => {
2062                                                                                 // A final node has sent us either an invalid code or an error_code that
2063                                                                                 // MUST be sent from the processing node, or the formmat of failuremsg
2064                                                                                 // does not coform to the spec.
2065                                                                                 // Remove it from the network map and don't may retry payment
2066                                                                                 res = Some((Some(msgs::HTLCFailChannelUpdate::NodeFailure {
2067                                                                                         node_id: route_hop.pubkey,
2068                                                                                         is_permanent: true,
2069                                                                                 }), false));
2070                                                                                 return;
2071                                                                         }
2072                                                                 };
2073                                                                 res = Some((None, payment_retryable));
2074                                                                 return;
2075                                                         }
2076
2077                                                         // now, error_code should be only from the intermediate nodes
2078                                                         match error_code {
2079                                                                 _c if error_code & PERM == PERM => {
2080                                                                         res = Some((Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
2081                                                                                 short_channel_id: route_hop.short_channel_id,
2082                                                                                 is_permanent: true,
2083                                                                         }), false));
2084                                                                 },
2085                                                                 _c if error_code & UPDATE == UPDATE => {
2086                                                                         let offset = match error_code {
2087                                                                                 c if c == UPDATE|7  => 0, // temporary_channel_failure
2088                                                                                 c if c == UPDATE|11 => 8, // amount_below_minimum
2089                                                                                 c if c == UPDATE|12 => 8, // fee_insufficient
2090                                                                                 c if c == UPDATE|13 => 4, // incorrect_cltv_expiry
2091                                                                                 c if c == UPDATE|14 => 0, // expiry_too_soon
2092                                                                                 c if c == UPDATE|20 => 2, // channel_disabled
2093                                                                                 _ =>  {
2094                                                                                         // node sending unknown code
2095                                                                                         res = Some((Some(msgs::HTLCFailChannelUpdate::NodeFailure {
2096                                                                                                 node_id: route_hop.pubkey,
2097                                                                                                 is_permanent: true,
2098                                                                                         }), false));
2099                                                                                         return;
2100                                                                                 }
2101                                                                         };
2102
2103                                                                         if err_packet.failuremsg.len() >= offset + 2 {
2104                                                                                 let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[offset+2..offset+4]) as usize;
2105                                                                                 if err_packet.failuremsg.len() >= offset + 4 + update_len {
2106                                                                                         if let Ok(chan_update) = msgs::ChannelUpdate::read(&mut Cursor::new(&err_packet.failuremsg[offset + 4..offset + 4 + update_len])) {
2107                                                                                                 // if channel_update should NOT have caused the failure:
2108                                                                                                 // MAY treat the channel_update as invalid.
2109                                                                                                 let is_chan_update_invalid = match error_code {
2110                                                                                                         c if c == UPDATE|7 => { // temporary_channel_failure
2111                                                                                                                 false
2112                                                                                                         },
2113                                                                                                         c if c == UPDATE|11 => { // amount_below_minimum
2114                                                                                                                 let reported_htlc_msat = byte_utils::slice_to_be64(&err_packet.failuremsg[2..2+8]);
2115                                                                                                                 onion_failure_log!("amount_below_minimum", UPDATE|11, "htlc_msat", reported_htlc_msat);
2116                                                                                                                 incoming_htlc_msat > chan_update.contents.htlc_minimum_msat
2117                                                                                                         },
2118                                                                                                         c if c == UPDATE|12 => { // fee_insufficient
2119                                                                                                                 let reported_htlc_msat = byte_utils::slice_to_be64(&err_packet.failuremsg[2..2+8]);
2120                                                                                                                 let new_fee =  amt_to_forward.checked_mul(chan_update.contents.fee_proportional_millionths as u64).and_then(|prop_fee| { (prop_fee / 1000000).checked_add(chan_update.contents.fee_base_msat as u64) });
2121                                                                                                                 onion_failure_log!("fee_insufficient", UPDATE|12, "htlc_msat", reported_htlc_msat);
2122                                                                                                                 new_fee.is_none() || incoming_htlc_msat >= new_fee.unwrap() && incoming_htlc_msat >= amt_to_forward + new_fee.unwrap()
2123                                                                                                         }
2124                                                                                                         c if c == UPDATE|13 => { // incorrect_cltv_expiry
2125                                                                                                                 let reported_cltv_expiry = byte_utils::slice_to_be32(&err_packet.failuremsg[2..2+4]);
2126                                                                                                                 onion_failure_log!("incorrect_cltv_expiry", UPDATE|13, "cltv_expiry", reported_cltv_expiry);
2127                                                                                                                 route_hop.cltv_expiry_delta as u16 >= chan_update.contents.cltv_expiry_delta
2128                                                                                                         },
2129                                                                                                         c if c == UPDATE|20 => { // channel_disabled
2130                                                                                                                 let reported_flags = byte_utils::slice_to_be16(&err_packet.failuremsg[2..2+2]);
2131                                                                                                                 onion_failure_log!("channel_disabled", UPDATE|20, "flags", reported_flags);
2132                                                                                                                 chan_update.contents.flags & 0x01 == 0x01
2133                                                                                                         },
2134                                                                                                         c if c == UPDATE|21 => true, // expiry_too_far
2135                                                                                                         _ => { unreachable!(); },
2136                                                                                                 };
2137
2138                                                                                                 let msg = if is_chan_update_invalid { None } else {
2139                                                                                                         Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage {
2140                                                                                                                 msg: chan_update,
2141                                                                                                         })
2142                                                                                                 };
2143                                                                                                 res = Some((msg, true));
2144                                                                                                 return;
2145                                                                                         }
2146                                                                                 }
2147                                                                         }
2148                                                                 },
2149                                                                 _c if error_code & BADONION == BADONION => {
2150                                                                         //TODO
2151                                                                 },
2152                                                                 14 => { // expiry_too_soon
2153                                                                         res = Some((None, true));
2154                                                                         return;
2155                                                                 }
2156                                                                 _ => {
2157                                                                         // node sending unknown code
2158                                                                         res = Some((Some(msgs::HTLCFailChannelUpdate::NodeFailure {
2159                                                                                 node_id: route_hop.pubkey,
2160                                                                                 is_permanent: true,
2161                                                                         }), false));
2162                                                                         return;
2163                                                                 }
2164                                                         }
2165                                                 }
2166                                         }
2167                                 }
2168                         }).expect("Route that we sent via spontaneously grew invalid keys in the middle of it?");
2169                         res.unwrap_or((None, true))
2170                 } else { ((None, true)) }
2171         }
2172
2173         fn internal_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<(), MsgHandleErrInternal> {
2174                 let mut channel_state = self.channel_state.lock().unwrap();
2175                 match channel_state.by_id.get_mut(&msg.channel_id) {
2176                         Some(chan) => {
2177                                 if chan.get_their_node_id() != *their_node_id {
2178                                         //TODO: here and below MsgHandleErrInternal, #153 case
2179                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2180                                 }
2181                                 chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() })
2182                                         .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))
2183                         },
2184                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2185                 }?;
2186                 Ok(())
2187         }
2188
2189         fn internal_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), MsgHandleErrInternal> {
2190                 let mut channel_state = self.channel_state.lock().unwrap();
2191                 match channel_state.by_id.get_mut(&msg.channel_id) {
2192                         Some(chan) => {
2193                                 if chan.get_their_node_id() != *their_node_id {
2194                                         //TODO: here and below MsgHandleErrInternal, #153 case
2195                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2196                                 }
2197                                 if (msg.failure_code & 0x8000) != 0 {
2198                                         return Err(MsgHandleErrInternal::send_err_msg_close_chan("Got update_fail_malformed_htlc with BADONION set", msg.channel_id));
2199                                 }
2200                                 chan.update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() })
2201                                         .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))?;
2202                                 Ok(())
2203                         },
2204                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2205                 }
2206         }
2207
2208         fn internal_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(), MsgHandleErrInternal> {
2209                 let mut channel_state_lock = self.channel_state.lock().unwrap();
2210                 let channel_state = channel_state_lock.borrow_parts();
2211                 match channel_state.by_id.get_mut(&msg.channel_id) {
2212                         Some(chan) => {
2213                                 if chan.get_their_node_id() != *their_node_id {
2214                                         //TODO: here and below MsgHandleErrInternal, #153 case
2215                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2216                                 }
2217                                 let (revoke_and_ack, commitment_signed, closing_signed, chan_monitor) = chan.commitment_signed(&msg, &*self.fee_estimator).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
2218                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
2219                                         unimplemented!();
2220                                 }
2221                                 channel_state.pending_msg_events.push(events::MessageSendEvent::SendRevokeAndACK {
2222                                         node_id: their_node_id.clone(),
2223                                         msg: revoke_and_ack,
2224                                 });
2225                                 if let Some(msg) = commitment_signed {
2226                                         channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
2227                                                 node_id: their_node_id.clone(),
2228                                                 updates: msgs::CommitmentUpdate {
2229                                                         update_add_htlcs: Vec::new(),
2230                                                         update_fulfill_htlcs: Vec::new(),
2231                                                         update_fail_htlcs: Vec::new(),
2232                                                         update_fail_malformed_htlcs: Vec::new(),
2233                                                         update_fee: None,
2234                                                         commitment_signed: msg,
2235                                                 },
2236                                         });
2237                                 }
2238                                 if let Some(msg) = closing_signed {
2239                                         channel_state.pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
2240                                                 node_id: their_node_id.clone(),
2241                                                 msg,
2242                                         });
2243                                 }
2244                                 Ok(())
2245                         },
2246                         None => Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2247                 }
2248         }
2249
2250         #[inline]
2251         fn forward_htlcs(&self, per_source_pending_forwards: &mut [(u64, Vec<(PendingForwardHTLCInfo, u64)>)]) {
2252                 for &mut (prev_short_channel_id, ref mut pending_forwards) in per_source_pending_forwards {
2253                         let mut forward_event = None;
2254                         if !pending_forwards.is_empty() {
2255                                 let mut channel_state = self.channel_state.lock().unwrap();
2256                                 if channel_state.forward_htlcs.is_empty() {
2257                                         forward_event = Some(Instant::now() + Duration::from_millis(((rng::rand_f32() * 4.0 + 1.0) * MIN_HTLC_RELAY_HOLDING_CELL_MILLIS as f32) as u64));
2258                                         channel_state.next_forward = forward_event.unwrap();
2259                                 }
2260                                 for (forward_info, prev_htlc_id) in pending_forwards.drain(..) {
2261                                         match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
2262                                                 hash_map::Entry::Occupied(mut entry) => {
2263                                                         entry.get_mut().push(HTLCForwardInfo { prev_short_channel_id, prev_htlc_id, forward_info });
2264                                                 },
2265                                                 hash_map::Entry::Vacant(entry) => {
2266                                                         entry.insert(vec!(HTLCForwardInfo { prev_short_channel_id, prev_htlc_id, forward_info }));
2267                                                 }
2268                                         }
2269                                 }
2270                         }
2271                         match forward_event {
2272                                 Some(time) => {
2273                                         let mut pending_events = self.pending_events.lock().unwrap();
2274                                         pending_events.push(events::Event::PendingHTLCsForwardable {
2275                                                 time_forwardable: time
2276                                         });
2277                                 }
2278                                 None => {},
2279                         }
2280                 }
2281         }
2282
2283         fn internal_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<(), MsgHandleErrInternal> {
2284                 let (pending_forwards, mut pending_failures, short_channel_id) = {
2285                         let mut channel_state_lock = self.channel_state.lock().unwrap();
2286                         let channel_state = channel_state_lock.borrow_parts();
2287                         match channel_state.by_id.get_mut(&msg.channel_id) {
2288                                 Some(chan) => {
2289                                         if chan.get_their_node_id() != *their_node_id {
2290                                                 //TODO: here and below MsgHandleErrInternal, #153 case
2291                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2292                                         }
2293                                         let (commitment_update, pending_forwards, pending_failures, closing_signed, chan_monitor) = chan.revoke_and_ack(&msg, &*self.fee_estimator).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
2294                                         if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
2295                                                 unimplemented!();
2296                                         }
2297                                         if let Some(updates) = commitment_update {
2298                                                 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
2299                                                         node_id: their_node_id.clone(),
2300                                                         updates,
2301                                                 });
2302                                         }
2303                                         if let Some(msg) = closing_signed {
2304                                                 channel_state.pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
2305                                                         node_id: their_node_id.clone(),
2306                                                         msg,
2307                                                 });
2308                                         }
2309                                         (pending_forwards, pending_failures, chan.get_short_channel_id().expect("RAA should only work on a short-id-available channel"))
2310                                 },
2311                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2312                         }
2313                 };
2314                 for failure in pending_failures.drain(..) {
2315                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), failure.0, &failure.1, failure.2);
2316                 }
2317                 self.forward_htlcs(&mut [(short_channel_id, pending_forwards)]);
2318
2319                 Ok(())
2320         }
2321
2322         fn internal_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), MsgHandleErrInternal> {
2323                 let mut channel_state = self.channel_state.lock().unwrap();
2324                 match channel_state.by_id.get_mut(&msg.channel_id) {
2325                         Some(chan) => {
2326                                 if chan.get_their_node_id() != *their_node_id {
2327                                         //TODO: here and below MsgHandleErrInternal, #153 case
2328                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2329                                 }
2330                                 chan.update_fee(&*self.fee_estimator, &msg).map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))
2331                         },
2332                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2333                 }
2334         }
2335
2336         fn internal_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), MsgHandleErrInternal> {
2337                 let mut channel_state_lock = self.channel_state.lock().unwrap();
2338                 let channel_state = channel_state_lock.borrow_parts();
2339
2340                 match channel_state.by_id.get_mut(&msg.channel_id) {
2341                         Some(chan) => {
2342                                 if chan.get_their_node_id() != *their_node_id {
2343                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2344                                 }
2345                                 if !chan.is_usable() {
2346                                         return Err(MsgHandleErrInternal::from_no_close(HandleError{err: "Got an announcement_signatures before we were ready for it", action: Some(msgs::ErrorAction::IgnoreError)}));
2347                                 }
2348
2349                                 let our_node_id = self.get_our_node_id();
2350                                 let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())
2351                                         .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))?;
2352
2353                                 let were_node_one = announcement.node_id_1 == our_node_id;
2354                                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
2355                                 let bad_sig_action = MsgHandleErrInternal::send_err_msg_close_chan("Bad announcement_signatures node_signature", msg.channel_id);
2356                                 secp_call!(self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }), bad_sig_action);
2357                                 secp_call!(self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }), bad_sig_action);
2358
2359                                 let our_node_sig = self.secp_ctx.sign(&msghash, &self.our_network_key);
2360
2361                                 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelAnnouncement {
2362                                         msg: msgs::ChannelAnnouncement {
2363                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
2364                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
2365                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
2366                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
2367                                                 contents: announcement,
2368                                         },
2369                                         update_msg: self.get_channel_update(chan).unwrap(), // can only fail if we're not in a ready state
2370                                 });
2371                         },
2372                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2373                 }
2374                 Ok(())
2375         }
2376
2377         fn internal_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) -> Result<(), MsgHandleErrInternal> {
2378                 let mut channel_state_lock = self.channel_state.lock().unwrap();
2379                 let channel_state = channel_state_lock.borrow_parts();
2380
2381                 match channel_state.by_id.get_mut(&msg.channel_id) {
2382                         Some(chan) => {
2383                                 if chan.get_their_node_id() != *their_node_id {
2384                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2385                                 }
2386                                 let (funding_locked, revoke_and_ack, commitment_update, channel_monitor, order) = chan.channel_reestablish(msg)
2387                                         .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))?;
2388                                 if let Some(monitor) = channel_monitor {
2389                                         if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
2390                                                 unimplemented!();
2391                                         }
2392                                 }
2393                                 if let Some(msg) = funding_locked {
2394                                         channel_state.pending_msg_events.push(events::MessageSendEvent::SendFundingLocked {
2395                                                 node_id: their_node_id.clone(),
2396                                                 msg
2397                                         });
2398                                 }
2399                                 macro_rules! send_raa { () => {
2400                                         if let Some(msg) = revoke_and_ack {
2401                                                 channel_state.pending_msg_events.push(events::MessageSendEvent::SendRevokeAndACK {
2402                                                         node_id: their_node_id.clone(),
2403                                                         msg
2404                                                 });
2405                                         }
2406                                 } }
2407                                 macro_rules! send_cu { () => {
2408                                         if let Some(updates) = commitment_update {
2409                                                 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
2410                                                         node_id: their_node_id.clone(),
2411                                                         updates
2412                                                 });
2413                                         }
2414                                 } }
2415                                 match order {
2416                                         RAACommitmentOrder::RevokeAndACKFirst => {
2417                                                 send_raa!();
2418                                                 send_cu!();
2419                                         },
2420                                         RAACommitmentOrder::CommitmentFirst => {
2421                                                 send_cu!();
2422                                                 send_raa!();
2423                                         },
2424                                 }
2425                                 Ok(())
2426                         },
2427                         None => Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2428                 }
2429         }
2430
2431         /// Begin Update fee process. Allowed only on an outbound channel.
2432         /// If successful, will generate a UpdateHTLCs event, so you should probably poll
2433         /// PeerManager::process_events afterwards.
2434         /// Note: This API is likely to change!
2435         #[doc(hidden)]
2436         pub fn update_fee(&self, channel_id: [u8;32], feerate_per_kw: u64) -> Result<(), APIError> {
2437                 let _ = self.total_consistency_lock.read().unwrap();
2438                 let mut channel_state_lock = self.channel_state.lock().unwrap();
2439                 let channel_state = channel_state_lock.borrow_parts();
2440
2441                 match channel_state.by_id.get_mut(&channel_id) {
2442                         None => return Err(APIError::APIMisuseError{err: "Failed to find corresponding channel"}),
2443                         Some(chan) => {
2444                                 if !chan.is_outbound() {
2445                                         return Err(APIError::APIMisuseError{err: "update_fee cannot be sent for an inbound channel"});
2446                                 }
2447                                 if chan.is_awaiting_monitor_update() {
2448                                         return Err(APIError::MonitorUpdateFailed);
2449                                 }
2450                                 if !chan.is_live() {
2451                                         return Err(APIError::ChannelUnavailable{err: "Channel is either not yet fully established or peer is currently disconnected"});
2452                                 }
2453                                 if let Some((update_fee, commitment_signed, chan_monitor)) = chan.send_update_fee_and_commit(feerate_per_kw).map_err(|e| APIError::APIMisuseError{err: e.err})? {
2454                                         if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
2455                                                 unimplemented!();
2456                                         }
2457                                         channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
2458                                                 node_id: chan.get_their_node_id(),
2459                                                 updates: msgs::CommitmentUpdate {
2460                                                         update_add_htlcs: Vec::new(),
2461                                                         update_fulfill_htlcs: Vec::new(),
2462                                                         update_fail_htlcs: Vec::new(),
2463                                                         update_fail_malformed_htlcs: Vec::new(),
2464                                                         update_fee: Some(update_fee),
2465                                                         commitment_signed,
2466                                                 },
2467                                         });
2468                                 }
2469                         },
2470                 }
2471                 Ok(())
2472         }
2473 }
2474
2475 impl events::MessageSendEventsProvider for ChannelManager {
2476         fn get_and_clear_pending_msg_events(&self) -> Vec<events::MessageSendEvent> {
2477                 let mut ret = Vec::new();
2478                 let mut channel_state = self.channel_state.lock().unwrap();
2479                 mem::swap(&mut ret, &mut channel_state.pending_msg_events);
2480                 ret
2481         }
2482 }
2483
2484 impl events::EventsProvider for ChannelManager {
2485         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
2486                 let mut ret = Vec::new();
2487                 let mut pending_events = self.pending_events.lock().unwrap();
2488                 mem::swap(&mut ret, &mut *pending_events);
2489                 ret
2490         }
2491 }
2492
2493 impl ChainListener for ChannelManager {
2494         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
2495                 let _ = self.total_consistency_lock.read().unwrap();
2496                 let mut failed_channels = Vec::new();
2497                 {
2498                         let mut channel_lock = self.channel_state.lock().unwrap();
2499                         let channel_state = channel_lock.borrow_parts();
2500                         let short_to_id = channel_state.short_to_id;
2501                         let pending_msg_events = channel_state.pending_msg_events;
2502                         channel_state.by_id.retain(|_, channel| {
2503                                 let chan_res = channel.block_connected(header, height, txn_matched, indexes_of_txn_matched);
2504                                 if let Ok(Some(funding_locked)) = chan_res {
2505                                         pending_msg_events.push(events::MessageSendEvent::SendFundingLocked {
2506                                                 node_id: channel.get_their_node_id(),
2507                                                 msg: funding_locked,
2508                                         });
2509                                         if let Some(announcement_sigs) = self.get_announcement_sigs(channel) {
2510                                                 pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
2511                                                         node_id: channel.get_their_node_id(),
2512                                                         msg: announcement_sigs,
2513                                                 });
2514                                         }
2515                                         short_to_id.insert(channel.get_short_channel_id().unwrap(), channel.channel_id());
2516                                 } else if let Err(e) = chan_res {
2517                                         pending_msg_events.push(events::MessageSendEvent::HandleError {
2518                                                 node_id: channel.get_their_node_id(),
2519                                                 action: e.action,
2520                                         });
2521                                         if channel.is_shutdown() {
2522                                                 return false;
2523                                         }
2524                                 }
2525                                 if let Some(funding_txo) = channel.get_funding_txo() {
2526                                         for tx in txn_matched {
2527                                                 for inp in tx.input.iter() {
2528                                                         if inp.previous_output == funding_txo.into_bitcoin_outpoint() {
2529                                                                 if let Some(short_id) = channel.get_short_channel_id() {
2530                                                                         short_to_id.remove(&short_id);
2531                                                                 }
2532                                                                 // It looks like our counterparty went on-chain. We go ahead and
2533                                                                 // broadcast our latest local state as well here, just in case its
2534                                                                 // some kind of SPV attack, though we expect these to be dropped.
2535                                                                 failed_channels.push(channel.force_shutdown());
2536                                                                 if let Ok(update) = self.get_channel_update(&channel) {
2537                                                                         pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
2538                                                                                 msg: update
2539                                                                         });
2540                                                                 }
2541                                                                 return false;
2542                                                         }
2543                                                 }
2544                                         }
2545                                 }
2546                                 if channel.is_funding_initiated() && channel.channel_monitor().would_broadcast_at_height(height) {
2547                                         if let Some(short_id) = channel.get_short_channel_id() {
2548                                                 short_to_id.remove(&short_id);
2549                                         }
2550                                         failed_channels.push(channel.force_shutdown());
2551                                         // If would_broadcast_at_height() is true, the channel_monitor will broadcast
2552                                         // the latest local tx for us, so we should skip that here (it doesn't really
2553                                         // hurt anything, but does make tests a bit simpler).
2554                                         failed_channels.last_mut().unwrap().0 = Vec::new();
2555                                         if let Ok(update) = self.get_channel_update(&channel) {
2556                                                 pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
2557                                                         msg: update
2558                                                 });
2559                                         }
2560                                         return false;
2561                                 }
2562                                 true
2563                         });
2564                 }
2565                 for failure in failed_channels.drain(..) {
2566                         self.finish_force_close_channel(failure);
2567                 }
2568                 self.latest_block_height.store(height as usize, Ordering::Release);
2569                 *self.last_block_hash.try_lock().expect("block_(dis)connected must not be called in parallel") = header.bitcoin_hash();
2570         }
2571
2572         /// We force-close the channel without letting our counterparty participate in the shutdown
2573         fn block_disconnected(&self, header: &BlockHeader) {
2574                 let _ = self.total_consistency_lock.read().unwrap();
2575                 let mut failed_channels = Vec::new();
2576                 {
2577                         let mut channel_lock = self.channel_state.lock().unwrap();
2578                         let channel_state = channel_lock.borrow_parts();
2579                         let short_to_id = channel_state.short_to_id;
2580                         let pending_msg_events = channel_state.pending_msg_events;
2581                         channel_state.by_id.retain(|_,  v| {
2582                                 if v.block_disconnected(header) {
2583                                         if let Some(short_id) = v.get_short_channel_id() {
2584                                                 short_to_id.remove(&short_id);
2585                                         }
2586                                         failed_channels.push(v.force_shutdown());
2587                                         if let Ok(update) = self.get_channel_update(&v) {
2588                                                 pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
2589                                                         msg: update
2590                                                 });
2591                                         }
2592                                         false
2593                                 } else {
2594                                         true
2595                                 }
2596                         });
2597                 }
2598                 for failure in failed_channels.drain(..) {
2599                         self.finish_force_close_channel(failure);
2600                 }
2601                 self.latest_block_height.fetch_sub(1, Ordering::AcqRel);
2602                 *self.last_block_hash.try_lock().expect("block_(dis)connected must not be called in parallel") = header.bitcoin_hash();
2603         }
2604 }
2605
2606 macro_rules! handle_error {
2607         ($self: ident, $internal: expr, $their_node_id: expr) => {
2608                 match $internal {
2609                         Ok(msg) => Ok(msg),
2610                         Err(MsgHandleErrInternal { err, needs_channel_force_close }) => {
2611                                 if needs_channel_force_close {
2612                                         match &err.action {
2613                                                 &Some(msgs::ErrorAction::DisconnectPeer { msg: Some(ref msg) }) => {
2614                                                         if msg.channel_id == [0; 32] {
2615                                                                 $self.peer_disconnected(&$their_node_id, true);
2616                                                         } else {
2617                                                                 $self.force_close_channel(&msg.channel_id);
2618                                                         }
2619                                                 },
2620                                                 &Some(msgs::ErrorAction::DisconnectPeer { msg: None }) => {},
2621                                                 &Some(msgs::ErrorAction::IgnoreError) => {},
2622                                                 &Some(msgs::ErrorAction::SendErrorMessage { ref msg }) => {
2623                                                         if msg.channel_id == [0; 32] {
2624                                                                 $self.peer_disconnected(&$their_node_id, true);
2625                                                         } else {
2626                                                                 $self.force_close_channel(&msg.channel_id);
2627                                                         }
2628                                                 },
2629                                                 &None => {},
2630                                         }
2631                                 }
2632                                 Err(err)
2633                         },
2634                 }
2635         }
2636 }
2637
2638 impl ChannelMessageHandler for ChannelManager {
2639         //TODO: Handle errors and close channel (or so)
2640         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<(), HandleError> {
2641                 let _ = self.total_consistency_lock.read().unwrap();
2642                 handle_error!(self, self.internal_open_channel(their_node_id, msg), their_node_id)
2643         }
2644
2645         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
2646                 let _ = self.total_consistency_lock.read().unwrap();
2647                 handle_error!(self, self.internal_accept_channel(their_node_id, msg), their_node_id)
2648         }
2649
2650         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<(), HandleError> {
2651                 let _ = self.total_consistency_lock.read().unwrap();
2652                 handle_error!(self, self.internal_funding_created(their_node_id, msg), their_node_id)
2653         }
2654
2655         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
2656                 let _ = self.total_consistency_lock.read().unwrap();
2657                 handle_error!(self, self.internal_funding_signed(their_node_id, msg), their_node_id)
2658         }
2659
2660         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<(), HandleError> {
2661                 let _ = self.total_consistency_lock.read().unwrap();
2662                 handle_error!(self, self.internal_funding_locked(their_node_id, msg), their_node_id)
2663         }
2664
2665         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(), HandleError> {
2666                 let _ = self.total_consistency_lock.read().unwrap();
2667                 handle_error!(self, self.internal_shutdown(their_node_id, msg), their_node_id)
2668         }
2669
2670         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<(), HandleError> {
2671                 let _ = self.total_consistency_lock.read().unwrap();
2672                 handle_error!(self, self.internal_closing_signed(their_node_id, msg), their_node_id)
2673         }
2674
2675         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
2676                 let _ = self.total_consistency_lock.read().unwrap();
2677                 handle_error!(self, self.internal_update_add_htlc(their_node_id, msg), their_node_id)
2678         }
2679
2680         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
2681                 let _ = self.total_consistency_lock.read().unwrap();
2682                 handle_error!(self, self.internal_update_fulfill_htlc(their_node_id, msg), their_node_id)
2683         }
2684
2685         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<(), HandleError> {
2686                 let _ = self.total_consistency_lock.read().unwrap();
2687                 handle_error!(self, self.internal_update_fail_htlc(their_node_id, msg), their_node_id)
2688         }
2689
2690         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> {
2691                 let _ = self.total_consistency_lock.read().unwrap();
2692                 handle_error!(self, self.internal_update_fail_malformed_htlc(their_node_id, msg), their_node_id)
2693         }
2694
2695         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(), HandleError> {
2696                 let _ = self.total_consistency_lock.read().unwrap();
2697                 handle_error!(self, self.internal_commitment_signed(their_node_id, msg), their_node_id)
2698         }
2699
2700         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<(), HandleError> {
2701                 let _ = self.total_consistency_lock.read().unwrap();
2702                 handle_error!(self, self.internal_revoke_and_ack(their_node_id, msg), their_node_id)
2703         }
2704
2705         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
2706                 let _ = self.total_consistency_lock.read().unwrap();
2707                 handle_error!(self, self.internal_update_fee(their_node_id, msg), their_node_id)
2708         }
2709
2710         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
2711                 let _ = self.total_consistency_lock.read().unwrap();
2712                 handle_error!(self, self.internal_announcement_signatures(their_node_id, msg), their_node_id)
2713         }
2714
2715         fn handle_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) -> Result<(), HandleError> {
2716                 let _ = self.total_consistency_lock.read().unwrap();
2717                 handle_error!(self, self.internal_channel_reestablish(their_node_id, msg), their_node_id)
2718         }
2719
2720         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
2721                 let _ = self.total_consistency_lock.read().unwrap();
2722                 let mut failed_channels = Vec::new();
2723                 let mut failed_payments = Vec::new();
2724                 {
2725                         let mut channel_state_lock = self.channel_state.lock().unwrap();
2726                         let channel_state = channel_state_lock.borrow_parts();
2727                         let short_to_id = channel_state.short_to_id;
2728                         let pending_msg_events = channel_state.pending_msg_events;
2729                         if no_connection_possible {
2730                                 channel_state.by_id.retain(|_, chan| {
2731                                         if chan.get_their_node_id() == *their_node_id {
2732                                                 if let Some(short_id) = chan.get_short_channel_id() {
2733                                                         short_to_id.remove(&short_id);
2734                                                 }
2735                                                 failed_channels.push(chan.force_shutdown());
2736                                                 if let Ok(update) = self.get_channel_update(&chan) {
2737                                                         pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
2738                                                                 msg: update
2739                                                         });
2740                                                 }
2741                                                 false
2742                                         } else {
2743                                                 true
2744                                         }
2745                                 });
2746                         } else {
2747                                 channel_state.by_id.retain(|_, chan| {
2748                                         if chan.get_their_node_id() == *their_node_id {
2749                                                 //TODO: mark channel disabled (and maybe announce such after a timeout).
2750                                                 let failed_adds = chan.remove_uncommitted_htlcs_and_mark_paused();
2751                                                 if !failed_adds.is_empty() {
2752                                                         let chan_update = self.get_channel_update(&chan).map(|u| u.encode_with_len()).unwrap(); // Cannot add/recv HTLCs before we have a short_id so unwrap is safe
2753                                                         failed_payments.push((chan_update, failed_adds));
2754                                                 }
2755                                                 if chan.is_shutdown() {
2756                                                         if let Some(short_id) = chan.get_short_channel_id() {
2757                                                                 short_to_id.remove(&short_id);
2758                                                         }
2759                                                         return false;
2760                                                 }
2761                                         }
2762                                         true
2763                                 })
2764                         }
2765                 }
2766                 for failure in failed_channels.drain(..) {
2767                         self.finish_force_close_channel(failure);
2768                 }
2769                 for (chan_update, mut htlc_sources) in failed_payments {
2770                         for (htlc_source, payment_hash) in htlc_sources.drain(..) {
2771                                 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source, &payment_hash, HTLCFailReason::Reason { failure_code: 0x1000 | 7, data: chan_update.clone() });
2772                         }
2773                 }
2774         }
2775
2776         fn peer_connected(&self, their_node_id: &PublicKey) {
2777                 let _ = self.total_consistency_lock.read().unwrap();
2778                 let mut channel_state_lock = self.channel_state.lock().unwrap();
2779                 let channel_state = channel_state_lock.borrow_parts();
2780                 let pending_msg_events = channel_state.pending_msg_events;
2781                 channel_state.by_id.retain(|_, chan| {
2782                         if chan.get_their_node_id() == *their_node_id {
2783                                 if !chan.have_received_message() {
2784                                         // If we created this (outbound) channel while we were disconnected from the
2785                                         // peer we probably failed to send the open_channel message, which is now
2786                                         // lost. We can't have had anything pending related to this channel, so we just
2787                                         // drop it.
2788                                         false
2789                                 } else {
2790                                         pending_msg_events.push(events::MessageSendEvent::SendChannelReestablish {
2791                                                 node_id: chan.get_their_node_id(),
2792                                                 msg: chan.get_channel_reestablish(),
2793                                         });
2794                                         true
2795                                 }
2796                         } else { true }
2797                 });
2798                 //TODO: Also re-broadcast announcement_signatures
2799         }
2800
2801         fn handle_error(&self, their_node_id: &PublicKey, msg: &msgs::ErrorMessage) {
2802                 let _ = self.total_consistency_lock.read().unwrap();
2803
2804                 if msg.channel_id == [0; 32] {
2805                         for chan in self.list_channels() {
2806                                 if chan.remote_network_id == *their_node_id {
2807                                         self.force_close_channel(&chan.channel_id);
2808                                 }
2809                         }
2810                 } else {
2811                         self.force_close_channel(&msg.channel_id);
2812                 }
2813         }
2814 }
2815
2816 const SERIALIZATION_VERSION: u8 = 1;
2817 const MIN_SERIALIZATION_VERSION: u8 = 1;
2818
2819 impl Writeable for PendingForwardHTLCInfo {
2820         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
2821                 if let &Some(ref onion) = &self.onion_packet {
2822                         1u8.write(writer)?;
2823                         onion.write(writer)?;
2824                 } else {
2825                         0u8.write(writer)?;
2826                 }
2827                 self.incoming_shared_secret.write(writer)?;
2828                 self.payment_hash.write(writer)?;
2829                 self.short_channel_id.write(writer)?;
2830                 self.amt_to_forward.write(writer)?;
2831                 self.outgoing_cltv_value.write(writer)?;
2832                 Ok(())
2833         }
2834 }
2835
2836 impl<R: ::std::io::Read> Readable<R> for PendingForwardHTLCInfo {
2837         fn read(reader: &mut R) -> Result<PendingForwardHTLCInfo, DecodeError> {
2838                 let onion_packet = match <u8 as Readable<R>>::read(reader)? {
2839                         0 => None,
2840                         1 => Some(msgs::OnionPacket::read(reader)?),
2841                         _ => return Err(DecodeError::InvalidValue),
2842                 };
2843                 Ok(PendingForwardHTLCInfo {
2844                         onion_packet,
2845                         incoming_shared_secret: Readable::read(reader)?,
2846                         payment_hash: Readable::read(reader)?,
2847                         short_channel_id: Readable::read(reader)?,
2848                         amt_to_forward: Readable::read(reader)?,
2849                         outgoing_cltv_value: Readable::read(reader)?,
2850                 })
2851         }
2852 }
2853
2854 impl Writeable for HTLCFailureMsg {
2855         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
2856                 match self {
2857                         &HTLCFailureMsg::Relay(ref fail_msg) => {
2858                                 0u8.write(writer)?;
2859                                 fail_msg.write(writer)?;
2860                         },
2861                         &HTLCFailureMsg::Malformed(ref fail_msg) => {
2862                                 1u8.write(writer)?;
2863                                 fail_msg.write(writer)?;
2864                         }
2865                 }
2866                 Ok(())
2867         }
2868 }
2869
2870 impl<R: ::std::io::Read> Readable<R> for HTLCFailureMsg {
2871         fn read(reader: &mut R) -> Result<HTLCFailureMsg, DecodeError> {
2872                 match <u8 as Readable<R>>::read(reader)? {
2873                         0 => Ok(HTLCFailureMsg::Relay(Readable::read(reader)?)),
2874                         1 => Ok(HTLCFailureMsg::Malformed(Readable::read(reader)?)),
2875                         _ => Err(DecodeError::InvalidValue),
2876                 }
2877         }
2878 }
2879
2880 impl Writeable for PendingHTLCStatus {
2881         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
2882                 match self {
2883                         &PendingHTLCStatus::Forward(ref forward_info) => {
2884                                 0u8.write(writer)?;
2885                                 forward_info.write(writer)?;
2886                         },
2887                         &PendingHTLCStatus::Fail(ref fail_msg) => {
2888                                 1u8.write(writer)?;
2889                                 fail_msg.write(writer)?;
2890                         }
2891                 }
2892                 Ok(())
2893         }
2894 }
2895
2896 impl<R: ::std::io::Read> Readable<R> for PendingHTLCStatus {
2897         fn read(reader: &mut R) -> Result<PendingHTLCStatus, DecodeError> {
2898                 match <u8 as Readable<R>>::read(reader)? {
2899                         0 => Ok(PendingHTLCStatus::Forward(Readable::read(reader)?)),
2900                         1 => Ok(PendingHTLCStatus::Fail(Readable::read(reader)?)),
2901                         _ => Err(DecodeError::InvalidValue),
2902                 }
2903         }
2904 }
2905
2906 impl_writeable!(HTLCPreviousHopData, 0, {
2907         short_channel_id,
2908         htlc_id,
2909         incoming_packet_shared_secret
2910 });
2911
2912 impl Writeable for HTLCSource {
2913         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
2914                 match self {
2915                         &HTLCSource::PreviousHopData(ref hop_data) => {
2916                                 0u8.write(writer)?;
2917                                 hop_data.write(writer)?;
2918                         },
2919                         &HTLCSource::OutboundRoute { ref route, ref session_priv, ref first_hop_htlc_msat } => {
2920                                 1u8.write(writer)?;
2921                                 route.write(writer)?;
2922                                 session_priv.write(writer)?;
2923                                 first_hop_htlc_msat.write(writer)?;
2924                         }
2925                 }
2926                 Ok(())
2927         }
2928 }
2929
2930 impl<R: ::std::io::Read> Readable<R> for HTLCSource {
2931         fn read(reader: &mut R) -> Result<HTLCSource, DecodeError> {
2932                 match <u8 as Readable<R>>::read(reader)? {
2933                         0 => Ok(HTLCSource::PreviousHopData(Readable::read(reader)?)),
2934                         1 => Ok(HTLCSource::OutboundRoute {
2935                                 route: Readable::read(reader)?,
2936                                 session_priv: Readable::read(reader)?,
2937                                 first_hop_htlc_msat: Readable::read(reader)?,
2938                         }),
2939                         _ => Err(DecodeError::InvalidValue),
2940                 }
2941         }
2942 }
2943
2944 impl Writeable for HTLCFailReason {
2945         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
2946                 match self {
2947                         &HTLCFailReason::ErrorPacket { ref err } => {
2948                                 0u8.write(writer)?;
2949                                 err.write(writer)?;
2950                         },
2951                         &HTLCFailReason::Reason { ref failure_code, ref data } => {
2952                                 1u8.write(writer)?;
2953                                 failure_code.write(writer)?;
2954                                 data.write(writer)?;
2955                         }
2956                 }
2957                 Ok(())
2958         }
2959 }
2960
2961 impl<R: ::std::io::Read> Readable<R> for HTLCFailReason {
2962         fn read(reader: &mut R) -> Result<HTLCFailReason, DecodeError> {
2963                 match <u8 as Readable<R>>::read(reader)? {
2964                         0 => Ok(HTLCFailReason::ErrorPacket { err: Readable::read(reader)? }),
2965                         1 => Ok(HTLCFailReason::Reason {
2966                                 failure_code: Readable::read(reader)?,
2967                                 data: Readable::read(reader)?,
2968                         }),
2969                         _ => Err(DecodeError::InvalidValue),
2970                 }
2971         }
2972 }
2973
2974 impl_writeable!(HTLCForwardInfo, 0, {
2975         prev_short_channel_id,
2976         prev_htlc_id,
2977         forward_info
2978 });
2979
2980 impl Writeable for ChannelManager {
2981         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
2982                 let _ = self.total_consistency_lock.write().unwrap();
2983
2984                 writer.write_all(&[SERIALIZATION_VERSION; 1])?;
2985                 writer.write_all(&[MIN_SERIALIZATION_VERSION; 1])?;
2986
2987                 self.genesis_hash.write(writer)?;
2988                 (self.latest_block_height.load(Ordering::Acquire) as u32).write(writer)?;
2989                 self.last_block_hash.lock().unwrap().write(writer)?;
2990
2991                 let channel_state = self.channel_state.lock().unwrap();
2992                 let mut unfunded_channels = 0;
2993                 for (_, channel) in channel_state.by_id.iter() {
2994                         if !channel.is_funding_initiated() {
2995                                 unfunded_channels += 1;
2996                         }
2997                 }
2998                 ((channel_state.by_id.len() - unfunded_channels) as u64).write(writer)?;
2999                 for (_, channel) in channel_state.by_id.iter() {
3000                         if channel.is_funding_initiated() {
3001                                 channel.write(writer)?;
3002                         }
3003                 }
3004
3005                 (channel_state.forward_htlcs.len() as u64).write(writer)?;
3006                 for (short_channel_id, pending_forwards) in channel_state.forward_htlcs.iter() {
3007                         short_channel_id.write(writer)?;
3008                         (pending_forwards.len() as u64).write(writer)?;
3009                         for forward in pending_forwards {
3010                                 forward.write(writer)?;
3011                         }
3012                 }
3013
3014                 (channel_state.claimable_htlcs.len() as u64).write(writer)?;
3015                 for (payment_hash, previous_hops) in channel_state.claimable_htlcs.iter() {
3016                         payment_hash.write(writer)?;
3017                         (previous_hops.len() as u64).write(writer)?;
3018                         for previous_hop in previous_hops {
3019                                 previous_hop.write(writer)?;
3020                         }
3021                 }
3022
3023                 Ok(())
3024         }
3025 }
3026
3027 /// Arguments for the creation of a ChannelManager that are not deserialized.
3028 ///
3029 /// At a high-level, the process for deserializing a ChannelManager and resuming normal operation
3030 /// is:
3031 /// 1) Deserialize all stored ChannelMonitors.
3032 /// 2) Deserialize the ChannelManager by filling in this struct and calling <(Sha256dHash,
3033 ///    ChannelManager)>::read(reader, args).
3034 ///    This may result in closing some Channels if the ChannelMonitor is newer than the stored
3035 ///    ChannelManager state to ensure no loss of funds. Thus, transactions may be broadcasted.
3036 /// 3) Register all relevant ChannelMonitor outpoints with your chain watch mechanism using
3037 ///    ChannelMonitor::get_monitored_outpoints and ChannelMonitor::get_funding_txo().
3038 /// 4) Reconnect blocks on your ChannelMonitors.
3039 /// 5) Move the ChannelMonitors into your local ManyChannelMonitor.
3040 /// 6) Disconnect/connect blocks on the ChannelManager.
3041 /// 7) Register the new ChannelManager with your ChainWatchInterface (this does not happen
3042 ///    automatically as it does in ChannelManager::new()).
3043 pub struct ChannelManagerReadArgs<'a> {
3044         /// The keys provider which will give us relevant keys. Some keys will be loaded during
3045         /// deserialization.
3046         pub keys_manager: Arc<KeysInterface>,
3047
3048         /// The fee_estimator for use in the ChannelManager in the future.
3049         ///
3050         /// No calls to the FeeEstimator will be made during deserialization.
3051         pub fee_estimator: Arc<FeeEstimator>,
3052         /// The ManyChannelMonitor for use in the ChannelManager in the future.
3053         ///
3054         /// No calls to the ManyChannelMonitor will be made during deserialization. It is assumed that
3055         /// you have deserialized ChannelMonitors separately and will add them to your
3056         /// ManyChannelMonitor after deserializing this ChannelManager.
3057         pub monitor: Arc<ManyChannelMonitor>,
3058         /// The ChainWatchInterface for use in the ChannelManager in the future.
3059         ///
3060         /// No calls to the ChainWatchInterface will be made during deserialization.
3061         pub chain_monitor: Arc<ChainWatchInterface>,
3062         /// The BroadcasterInterface which will be used in the ChannelManager in the future and may be
3063         /// used to broadcast the latest local commitment transactions of channels which must be
3064         /// force-closed during deserialization.
3065         pub tx_broadcaster: Arc<BroadcasterInterface>,
3066         /// The Logger for use in the ChannelManager and which may be used to log information during
3067         /// deserialization.
3068         pub logger: Arc<Logger>,
3069         /// Default settings used for new channels. Any existing channels will continue to use the
3070         /// runtime settings which were stored when the ChannelManager was serialized.
3071         pub default_config: UserConfig,
3072
3073         /// A map from channel funding outpoints to ChannelMonitors for those channels (ie
3074         /// value.get_funding_txo() should be the key).
3075         ///
3076         /// If a monitor is inconsistent with the channel state during deserialization the channel will
3077         /// be force-closed using the data in the channelmonitor and the Channel will be dropped. This
3078         /// is true for missing channels as well. If there is a monitor missing for which we find
3079         /// channel data Err(DecodeError::InvalidValue) will be returned.
3080         ///
3081         /// In such cases the latest local transactions will be sent to the tx_broadcaster included in
3082         /// this struct.
3083         pub channel_monitors: &'a HashMap<OutPoint, &'a ChannelMonitor>,
3084 }
3085
3086 impl<'a, R : ::std::io::Read> ReadableArgs<R, ChannelManagerReadArgs<'a>> for (Sha256dHash, ChannelManager) {
3087         fn read(reader: &mut R, args: ChannelManagerReadArgs<'a>) -> Result<Self, DecodeError> {
3088                 let _ver: u8 = Readable::read(reader)?;
3089                 let min_ver: u8 = Readable::read(reader)?;
3090                 if min_ver > SERIALIZATION_VERSION {
3091                         return Err(DecodeError::UnknownVersion);
3092                 }
3093
3094                 let genesis_hash: Sha256dHash = Readable::read(reader)?;
3095                 let latest_block_height: u32 = Readable::read(reader)?;
3096                 let last_block_hash: Sha256dHash = Readable::read(reader)?;
3097
3098                 let mut closed_channels = Vec::new();
3099
3100                 let channel_count: u64 = Readable::read(reader)?;
3101                 let mut funding_txo_set = HashSet::with_capacity(cmp::min(channel_count as usize, 128));
3102                 let mut by_id = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
3103                 let mut short_to_id = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
3104                 for _ in 0..channel_count {
3105                         let mut channel: Channel = ReadableArgs::read(reader, args.logger.clone())?;
3106                         if channel.last_block_connected != last_block_hash {
3107                                 return Err(DecodeError::InvalidValue);
3108                         }
3109
3110                         let funding_txo = channel.channel_monitor().get_funding_txo().ok_or(DecodeError::InvalidValue)?;
3111                         funding_txo_set.insert(funding_txo.clone());
3112                         if let Some(monitor) = args.channel_monitors.get(&funding_txo) {
3113                                 if channel.get_cur_local_commitment_transaction_number() != monitor.get_cur_local_commitment_number() ||
3114                                                 channel.get_revoked_remote_commitment_transaction_number() != monitor.get_min_seen_secret() ||
3115                                                 channel.get_cur_remote_commitment_transaction_number() != monitor.get_cur_remote_commitment_number() {
3116                                         let mut force_close_res = channel.force_shutdown();
3117                                         force_close_res.0 = monitor.get_latest_local_commitment_txn();
3118                                         closed_channels.push(force_close_res);
3119                                 } else {
3120                                         if let Some(short_channel_id) = channel.get_short_channel_id() {
3121                                                 short_to_id.insert(short_channel_id, channel.channel_id());
3122                                         }
3123                                         by_id.insert(channel.channel_id(), channel);
3124                                 }
3125                         } else {
3126                                 return Err(DecodeError::InvalidValue);
3127                         }
3128                 }
3129
3130                 for (ref funding_txo, ref monitor) in args.channel_monitors.iter() {
3131                         if !funding_txo_set.contains(funding_txo) {
3132                                 closed_channels.push((monitor.get_latest_local_commitment_txn(), Vec::new()));
3133                         }
3134                 }
3135
3136                 let forward_htlcs_count: u64 = Readable::read(reader)?;
3137                 let mut forward_htlcs = HashMap::with_capacity(cmp::min(forward_htlcs_count as usize, 128));
3138                 for _ in 0..forward_htlcs_count {
3139                         let short_channel_id = Readable::read(reader)?;
3140                         let pending_forwards_count: u64 = Readable::read(reader)?;
3141                         let mut pending_forwards = Vec::with_capacity(cmp::min(pending_forwards_count as usize, 128));
3142                         for _ in 0..pending_forwards_count {
3143                                 pending_forwards.push(Readable::read(reader)?);
3144                         }
3145                         forward_htlcs.insert(short_channel_id, pending_forwards);
3146                 }
3147
3148                 let claimable_htlcs_count: u64 = Readable::read(reader)?;
3149                 let mut claimable_htlcs = HashMap::with_capacity(cmp::min(claimable_htlcs_count as usize, 128));
3150                 for _ in 0..claimable_htlcs_count {
3151                         let payment_hash = Readable::read(reader)?;
3152                         let previous_hops_len: u64 = Readable::read(reader)?;
3153                         let mut previous_hops = Vec::with_capacity(cmp::min(previous_hops_len as usize, 2));
3154                         for _ in 0..previous_hops_len {
3155                                 previous_hops.push(Readable::read(reader)?);
3156                         }
3157                         claimable_htlcs.insert(payment_hash, previous_hops);
3158                 }
3159
3160                 let channel_manager = ChannelManager {
3161                         genesis_hash,
3162                         fee_estimator: args.fee_estimator,
3163                         monitor: args.monitor,
3164                         chain_monitor: args.chain_monitor,
3165                         tx_broadcaster: args.tx_broadcaster,
3166
3167                         latest_block_height: AtomicUsize::new(latest_block_height as usize),
3168                         last_block_hash: Mutex::new(last_block_hash),
3169                         secp_ctx: Secp256k1::new(),
3170
3171                         channel_state: Mutex::new(ChannelHolder {
3172                                 by_id,
3173                                 short_to_id,
3174                                 next_forward: Instant::now(),
3175                                 forward_htlcs,
3176                                 claimable_htlcs,
3177                                 pending_msg_events: Vec::new(),
3178                         }),
3179                         our_network_key: args.keys_manager.get_node_secret(),
3180
3181                         pending_events: Mutex::new(Vec::new()),
3182                         total_consistency_lock: RwLock::new(()),
3183                         keys_manager: args.keys_manager,
3184                         logger: args.logger,
3185                         default_configuration: args.default_config,
3186                 };
3187
3188                 for close_res in closed_channels.drain(..) {
3189                         channel_manager.finish_force_close_channel(close_res);
3190                         //TODO: Broadcast channel update for closed channels, but only after we've made a
3191                         //connection or two.
3192                 }
3193
3194                 Ok((last_block_hash.clone(), channel_manager))
3195         }
3196 }
3197
3198 #[cfg(test)]
3199 mod tests {
3200         use chain::chaininterface;
3201         use chain::transaction::OutPoint;
3202         use chain::chaininterface::{ChainListener, ChainWatchInterface};
3203         use chain::keysinterface::KeysInterface;
3204         use chain::keysinterface;
3205         use ln::channelmanager::{ChannelManager,ChannelManagerReadArgs,OnionKeys,PaymentFailReason,RAACommitmentOrder};
3206         use ln::channelmonitor::{ChannelMonitor, ChannelMonitorUpdateErr, CLTV_CLAIM_BUFFER, HTLC_FAIL_TIMEOUT_BLOCKS, ManyChannelMonitor};
3207         use ln::router::{Route, RouteHop, Router};
3208         use ln::msgs;
3209         use ln::msgs::{ChannelMessageHandler,RoutingMessageHandler};
3210         use util::test_utils;
3211         use util::events::{Event, EventsProvider, MessageSendEvent, MessageSendEventsProvider};
3212         use util::errors::APIError;
3213         use util::logger::Logger;
3214         use util::ser::{Writeable, Writer, ReadableArgs};
3215         use util::config::UserConfig;
3216
3217         use bitcoin::util::hash::Sha256dHash;
3218         use bitcoin::blockdata::block::{Block, BlockHeader};
3219         use bitcoin::blockdata::transaction::{Transaction, TxOut};
3220         use bitcoin::blockdata::constants::genesis_block;
3221         use bitcoin::network::constants::Network;
3222         use bitcoin::network::serialize::serialize;
3223         use bitcoin::network::serialize::BitcoinHash;
3224
3225         use hex;
3226
3227         use secp256k1::{Secp256k1, Message};
3228         use secp256k1::key::{PublicKey,SecretKey};
3229
3230         use crypto::sha2::Sha256;
3231         use crypto::digest::Digest;
3232
3233         use rand::{thread_rng,Rng};
3234
3235         use std::cell::RefCell;
3236         use std::collections::{BTreeSet, HashMap};
3237         use std::default::Default;
3238         use std::rc::Rc;
3239         use std::sync::{Arc, Mutex};
3240         use std::sync::atomic::Ordering;
3241         use std::time::Instant;
3242         use std::mem;
3243
3244         fn build_test_onion_keys() -> Vec<OnionKeys> {
3245                 // Keys from BOLT 4, used in both test vector tests
3246                 let secp_ctx = Secp256k1::new();
3247
3248                 let route = Route {
3249                         hops: vec!(
3250                                         RouteHop {
3251                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
3252                                                 short_channel_id: 0, fee_msat: 0, cltv_expiry_delta: 0 // Test vectors are garbage and not generateble from a RouteHop, we fill in payloads manually
3253                                         },
3254                                         RouteHop {
3255                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
3256                                                 short_channel_id: 0, fee_msat: 0, cltv_expiry_delta: 0 // Test vectors are garbage and not generateble from a RouteHop, we fill in payloads manually
3257                                         },
3258                                         RouteHop {
3259                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
3260                                                 short_channel_id: 0, fee_msat: 0, cltv_expiry_delta: 0 // Test vectors are garbage and not generateble from a RouteHop, we fill in payloads manually
3261                                         },
3262                                         RouteHop {
3263                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
3264                                                 short_channel_id: 0, fee_msat: 0, cltv_expiry_delta: 0 // Test vectors are garbage and not generateble from a RouteHop, we fill in payloads manually
3265                                         },
3266                                         RouteHop {
3267                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
3268                                                 short_channel_id: 0, fee_msat: 0, cltv_expiry_delta: 0 // Test vectors are garbage and not generateble from a RouteHop, we fill in payloads manually
3269                                         },
3270                         ),
3271                 };
3272
3273                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex::decode("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
3274
3275                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
3276                 assert_eq!(onion_keys.len(), route.hops.len());
3277                 onion_keys
3278         }
3279
3280         #[test]
3281         fn onion_vectors() {
3282                 // Packet creation test vectors from BOLT 4
3283                 let onion_keys = build_test_onion_keys();
3284
3285                 assert_eq!(onion_keys[0].shared_secret[..], hex::decode("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
3286                 assert_eq!(onion_keys[0].blinding_factor[..], hex::decode("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
3287                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
3288                 assert_eq!(onion_keys[0].rho, hex::decode("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
3289                 assert_eq!(onion_keys[0].mu, hex::decode("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
3290
3291                 assert_eq!(onion_keys[1].shared_secret[..], hex::decode("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
3292                 assert_eq!(onion_keys[1].blinding_factor[..], hex::decode("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
3293                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex::decode("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
3294                 assert_eq!(onion_keys[1].rho, hex::decode("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
3295                 assert_eq!(onion_keys[1].mu, hex::decode("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
3296
3297                 assert_eq!(onion_keys[2].shared_secret[..], hex::decode("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
3298                 assert_eq!(onion_keys[2].blinding_factor[..], hex::decode("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
3299                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex::decode("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
3300                 assert_eq!(onion_keys[2].rho, hex::decode("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
3301                 assert_eq!(onion_keys[2].mu, hex::decode("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
3302
3303                 assert_eq!(onion_keys[3].shared_secret[..], hex::decode("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
3304                 assert_eq!(onion_keys[3].blinding_factor[..], hex::decode("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
3305                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex::decode("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
3306                 assert_eq!(onion_keys[3].rho, hex::decode("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
3307                 assert_eq!(onion_keys[3].mu, hex::decode("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
3308
3309                 assert_eq!(onion_keys[4].shared_secret[..], hex::decode("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
3310                 assert_eq!(onion_keys[4].blinding_factor[..], hex::decode("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
3311                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex::decode("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
3312                 assert_eq!(onion_keys[4].rho, hex::decode("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
3313                 assert_eq!(onion_keys[4].mu, hex::decode("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
3314
3315                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
3316                 let payloads = vec!(
3317                         msgs::OnionHopData {
3318                                 realm: 0,
3319                                 data: msgs::OnionRealm0HopData {
3320                                         short_channel_id: 0,
3321                                         amt_to_forward: 0,
3322                                         outgoing_cltv_value: 0,
3323                                 },
3324                                 hmac: [0; 32],
3325                         },
3326                         msgs::OnionHopData {
3327                                 realm: 0,
3328                                 data: msgs::OnionRealm0HopData {
3329                                         short_channel_id: 0x0101010101010101,
3330                                         amt_to_forward: 0x0100000001,
3331                                         outgoing_cltv_value: 0,
3332                                 },
3333                                 hmac: [0; 32],
3334                         },
3335                         msgs::OnionHopData {
3336                                 realm: 0,
3337                                 data: msgs::OnionRealm0HopData {
3338                                         short_channel_id: 0x0202020202020202,
3339                                         amt_to_forward: 0x0200000002,
3340                                         outgoing_cltv_value: 0,
3341                                 },
3342                                 hmac: [0; 32],
3343                         },
3344                         msgs::OnionHopData {
3345                                 realm: 0,
3346                                 data: msgs::OnionRealm0HopData {
3347                                         short_channel_id: 0x0303030303030303,
3348                                         amt_to_forward: 0x0300000003,
3349                                         outgoing_cltv_value: 0,
3350                                 },
3351                                 hmac: [0; 32],
3352                         },
3353                         msgs::OnionHopData {
3354                                 realm: 0,
3355                                 data: msgs::OnionRealm0HopData {
3356                                         short_channel_id: 0x0404040404040404,
3357                                         amt_to_forward: 0x0400000004,
3358                                         outgoing_cltv_value: 0,
3359                                 },
3360                                 hmac: [0; 32],
3361                         },
3362                 );
3363
3364                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, &[0x42; 32]);
3365                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
3366                 // anyway...
3367                 assert_eq!(packet.encode(), hex::decode("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").unwrap());
3368         }
3369
3370         #[test]
3371         fn test_failure_packet_onion() {
3372                 // Returning Errors test vectors from BOLT 4
3373
3374                 let onion_keys = build_test_onion_keys();
3375                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret[..], 0x2002, &[0; 0]);
3376                 assert_eq!(onion_error.encode(), hex::decode("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").unwrap());
3377
3378                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret[..], &onion_error.encode()[..]);
3379                 assert_eq!(onion_packet_1.data, hex::decode("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").unwrap());
3380
3381                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret[..], &onion_packet_1.data[..]);
3382                 assert_eq!(onion_packet_2.data, hex::decode("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").unwrap());
3383
3384                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret[..], &onion_packet_2.data[..]);
3385                 assert_eq!(onion_packet_3.data, hex::decode("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").unwrap());
3386
3387                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret[..], &onion_packet_3.data[..]);
3388                 assert_eq!(onion_packet_4.data, hex::decode("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").unwrap());
3389
3390                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret[..], &onion_packet_4.data[..]);
3391                 assert_eq!(onion_packet_5.data, hex::decode("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").unwrap());
3392         }
3393
3394         fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction, chan_id: u32) {
3395                 assert!(chain.does_match_tx(tx));
3396                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3397                 chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id; 1]);
3398                 for i in 2..100 {
3399                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3400                         chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
3401                 }
3402         }
3403
3404         struct Node {
3405                 chain_monitor: Arc<chaininterface::ChainWatchInterfaceUtil>,
3406                 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
3407                 chan_monitor: Arc<test_utils::TestChannelMonitor>,
3408                 node: Arc<ChannelManager>,
3409                 router: Router,
3410                 node_seed: [u8; 32],
3411                 network_payment_count: Rc<RefCell<u8>>,
3412                 network_chan_count: Rc<RefCell<u32>>,
3413         }
3414         impl Drop for Node {
3415                 fn drop(&mut self) {
3416                         if !::std::thread::panicking() {
3417                                 // Check that we processed all pending events
3418                                 assert_eq!(self.node.get_and_clear_pending_msg_events().len(), 0);
3419                                 assert_eq!(self.node.get_and_clear_pending_events().len(), 0);
3420                                 assert_eq!(self.chan_monitor.added_monitors.lock().unwrap().len(), 0);
3421                         }
3422                 }
3423         }
3424
3425         fn create_chan_between_nodes(node_a: &Node, node_b: &Node) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
3426                 create_chan_between_nodes_with_value(node_a, node_b, 100000, 10001)
3427         }
3428
3429         fn create_chan_between_nodes_with_value(node_a: &Node, node_b: &Node, channel_value: u64, push_msat: u64) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
3430                 let (funding_locked, channel_id, tx) = create_chan_between_nodes_with_value_a(node_a, node_b, channel_value, push_msat);
3431                 let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(node_a, node_b, &funding_locked);
3432                 (announcement, as_update, bs_update, channel_id, tx)
3433         }
3434
3435         macro_rules! get_revoke_commit_msgs {
3436                 ($node: expr, $node_id: expr) => {
3437                         {
3438                                 let events = $node.node.get_and_clear_pending_msg_events();
3439                                 assert_eq!(events.len(), 2);
3440                                 (match events[0] {
3441                                         MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
3442                                                 assert_eq!(*node_id, $node_id);
3443                                                 (*msg).clone()
3444                                         },
3445                                         _ => panic!("Unexpected event"),
3446                                 }, match events[1] {
3447                                         MessageSendEvent::UpdateHTLCs { ref node_id, ref updates } => {
3448                                                 assert_eq!(*node_id, $node_id);
3449                                                 assert!(updates.update_add_htlcs.is_empty());
3450                                                 assert!(updates.update_fulfill_htlcs.is_empty());
3451                                                 assert!(updates.update_fail_htlcs.is_empty());
3452                                                 assert!(updates.update_fail_malformed_htlcs.is_empty());
3453                                                 assert!(updates.update_fee.is_none());
3454                                                 updates.commitment_signed.clone()
3455                                         },
3456                                         _ => panic!("Unexpected event"),
3457                                 })
3458                         }
3459                 }
3460         }
3461
3462         macro_rules! get_event_msg {
3463                 ($node: expr, $event_type: path, $node_id: expr) => {
3464                         {
3465                                 let events = $node.node.get_and_clear_pending_msg_events();
3466                                 assert_eq!(events.len(), 1);
3467                                 match events[0] {
3468                                         $event_type { ref node_id, ref msg } => {
3469                                                 assert_eq!(*node_id, $node_id);
3470                                                 (*msg).clone()
3471                                         },
3472                                         _ => panic!("Unexpected event"),
3473                                 }
3474                         }
3475                 }
3476         }
3477
3478         macro_rules! get_htlc_update_msgs {
3479                 ($node: expr, $node_id: expr) => {
3480                         {
3481                                 let events = $node.node.get_and_clear_pending_msg_events();
3482                                 assert_eq!(events.len(), 1);
3483                                 match events[0] {
3484                                         MessageSendEvent::UpdateHTLCs { ref node_id, ref updates } => {
3485                                                 assert_eq!(*node_id, $node_id);
3486                                                 (*updates).clone()
3487                                         },
3488                                         _ => panic!("Unexpected event"),
3489                                 }
3490                         }
3491                 }
3492         }
3493
3494         fn create_chan_between_nodes_with_value_init(node_a: &Node, node_b: &Node, channel_value: u64, push_msat: u64) -> Transaction {
3495                 node_a.node.create_channel(node_b.node.get_our_node_id(), channel_value, push_msat, 42).unwrap();
3496                 node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), &get_event_msg!(node_a, MessageSendEvent::SendOpenChannel, node_b.node.get_our_node_id())).unwrap();
3497                 node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &get_event_msg!(node_b, MessageSendEvent::SendAcceptChannel, node_a.node.get_our_node_id())).unwrap();
3498
3499                 let chan_id = *node_a.network_chan_count.borrow();
3500                 let tx;
3501                 let funding_output;
3502
3503                 let events_2 = node_a.node.get_and_clear_pending_events();
3504                 assert_eq!(events_2.len(), 1);
3505                 match events_2[0] {
3506                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
3507                                 assert_eq!(*channel_value_satoshis, channel_value);
3508                                 assert_eq!(user_channel_id, 42);
3509
3510                                 tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
3511                                         value: *channel_value_satoshis, script_pubkey: output_script.clone(),
3512                                 }]};
3513                                 funding_output = OutPoint::new(Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
3514
3515                                 node_a.node.funding_transaction_generated(&temporary_channel_id, funding_output);
3516                                 let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
3517                                 assert_eq!(added_monitors.len(), 1);
3518                                 assert_eq!(added_monitors[0].0, funding_output);
3519                                 added_monitors.clear();
3520                         },
3521                         _ => panic!("Unexpected event"),
3522                 }
3523
3524                 node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), &get_event_msg!(node_a, MessageSendEvent::SendFundingCreated, node_b.node.get_our_node_id())).unwrap();
3525                 {
3526                         let mut added_monitors = node_b.chan_monitor.added_monitors.lock().unwrap();
3527                         assert_eq!(added_monitors.len(), 1);
3528                         assert_eq!(added_monitors[0].0, funding_output);
3529                         added_monitors.clear();
3530                 }
3531
3532                 node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &get_event_msg!(node_b, MessageSendEvent::SendFundingSigned, node_a.node.get_our_node_id())).unwrap();
3533                 {
3534                         let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
3535                         assert_eq!(added_monitors.len(), 1);
3536                         assert_eq!(added_monitors[0].0, funding_output);
3537                         added_monitors.clear();
3538                 }
3539
3540                 let events_4 = node_a.node.get_and_clear_pending_events();
3541                 assert_eq!(events_4.len(), 1);
3542                 match events_4[0] {
3543                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
3544                                 assert_eq!(user_channel_id, 42);
3545                                 assert_eq!(*funding_txo, funding_output);
3546                         },
3547                         _ => panic!("Unexpected event"),
3548                 };
3549
3550                 tx
3551         }
3552
3553         fn create_chan_between_nodes_with_value_confirm(node_a: &Node, node_b: &Node, tx: &Transaction) -> ((msgs::FundingLocked, msgs::AnnouncementSignatures), [u8; 32]) {
3554                 confirm_transaction(&node_b.chain_monitor, &tx, tx.version);
3555                 node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), &get_event_msg!(node_b, MessageSendEvent::SendFundingLocked, node_a.node.get_our_node_id())).unwrap();
3556
3557                 let channel_id;
3558
3559                 confirm_transaction(&node_a.chain_monitor, &tx, tx.version);
3560                 let events_6 = node_a.node.get_and_clear_pending_msg_events();
3561                 assert_eq!(events_6.len(), 2);
3562                 ((match events_6[0] {
3563                         MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
3564                                 channel_id = msg.channel_id.clone();
3565                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
3566                                 msg.clone()
3567                         },
3568                         _ => panic!("Unexpected event"),
3569                 }, match events_6[1] {
3570                         MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
3571                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
3572                                 msg.clone()
3573                         },
3574                         _ => panic!("Unexpected event"),
3575                 }), channel_id)
3576         }
3577
3578         fn create_chan_between_nodes_with_value_a(node_a: &Node, node_b: &Node, channel_value: u64, push_msat: u64) -> ((msgs::FundingLocked, msgs::AnnouncementSignatures), [u8; 32], Transaction) {
3579                 let tx = create_chan_between_nodes_with_value_init(node_a, node_b, channel_value, push_msat);
3580                 let (msgs, chan_id) = create_chan_between_nodes_with_value_confirm(node_a, node_b, &tx);
3581                 (msgs, chan_id, tx)
3582         }
3583
3584         fn create_chan_between_nodes_with_value_b(node_a: &Node, node_b: &Node, as_funding_msgs: &(msgs::FundingLocked, msgs::AnnouncementSignatures)) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate) {
3585                 node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), &as_funding_msgs.0).unwrap();
3586                 let bs_announcement_sigs = get_event_msg!(node_b, MessageSendEvent::SendAnnouncementSignatures, node_a.node.get_our_node_id());
3587                 node_b.node.handle_announcement_signatures(&node_a.node.get_our_node_id(), &as_funding_msgs.1).unwrap();
3588
3589                 let events_7 = node_b.node.get_and_clear_pending_msg_events();
3590                 assert_eq!(events_7.len(), 1);
3591                 let (announcement, bs_update) = match events_7[0] {
3592                         MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
3593                                 (msg, update_msg)
3594                         },
3595                         _ => panic!("Unexpected event"),
3596                 };
3597
3598                 node_a.node.handle_announcement_signatures(&node_b.node.get_our_node_id(), &bs_announcement_sigs).unwrap();
3599                 let events_8 = node_a.node.get_and_clear_pending_msg_events();
3600                 assert_eq!(events_8.len(), 1);
3601                 let as_update = match events_8[0] {
3602                         MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
3603                                 assert!(*announcement == *msg);
3604                                 update_msg
3605                         },
3606                         _ => panic!("Unexpected event"),
3607                 };
3608
3609                 *node_a.network_chan_count.borrow_mut() += 1;
3610
3611                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone())
3612         }
3613
3614         fn create_announced_chan_between_nodes(nodes: &Vec<Node>, a: usize, b: usize) -> (msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
3615                 create_announced_chan_between_nodes_with_value(nodes, a, b, 100000, 10001)
3616         }
3617
3618         fn create_announced_chan_between_nodes_with_value(nodes: &Vec<Node>, a: usize, b: usize, channel_value: u64, push_msat: u64) -> (msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
3619                 let chan_announcement = create_chan_between_nodes_with_value(&nodes[a], &nodes[b], channel_value, push_msat);
3620                 for node in nodes {
3621                         assert!(node.router.handle_channel_announcement(&chan_announcement.0).unwrap());
3622                         node.router.handle_channel_update(&chan_announcement.1).unwrap();
3623                         node.router.handle_channel_update(&chan_announcement.2).unwrap();
3624                 }
3625                 (chan_announcement.1, chan_announcement.2, chan_announcement.3, chan_announcement.4)
3626         }
3627
3628         macro_rules! check_spends {
3629                 ($tx: expr, $spends_tx: expr) => {
3630                         {
3631                                 let mut funding_tx_map = HashMap::new();
3632                                 let spends_tx = $spends_tx;
3633                                 funding_tx_map.insert(spends_tx.txid(), spends_tx);
3634                                 $tx.verify(&funding_tx_map).unwrap();
3635                         }
3636                 }
3637         }
3638
3639         fn close_channel(outbound_node: &Node, inbound_node: &Node, channel_id: &[u8; 32], funding_tx: Transaction, close_inbound_first: bool) -> (msgs::ChannelUpdate, msgs::ChannelUpdate) {
3640                 let (node_a, broadcaster_a, struct_a) = if close_inbound_first { (&inbound_node.node, &inbound_node.tx_broadcaster, inbound_node) } else { (&outbound_node.node, &outbound_node.tx_broadcaster, outbound_node) };
3641                 let (node_b, broadcaster_b) = if close_inbound_first { (&outbound_node.node, &outbound_node.tx_broadcaster) } else { (&inbound_node.node, &inbound_node.tx_broadcaster) };
3642                 let (tx_a, tx_b);
3643
3644                 node_a.close_channel(channel_id).unwrap();
3645                 node_b.handle_shutdown(&node_a.get_our_node_id(), &get_event_msg!(struct_a, MessageSendEvent::SendShutdown, node_b.get_our_node_id())).unwrap();
3646
3647                 let events_1 = node_b.get_and_clear_pending_msg_events();
3648                 assert!(events_1.len() >= 1);
3649                 let shutdown_b = match events_1[0] {
3650                         MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
3651                                 assert_eq!(node_id, &node_a.get_our_node_id());
3652                                 msg.clone()
3653                         },
3654                         _ => panic!("Unexpected event"),
3655                 };
3656
3657                 let closing_signed_b = if !close_inbound_first {
3658                         assert_eq!(events_1.len(), 1);
3659                         None
3660                 } else {
3661                         Some(match events_1[1] {
3662                                 MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
3663                                         assert_eq!(node_id, &node_a.get_our_node_id());
3664                                         msg.clone()
3665                                 },
3666                                 _ => panic!("Unexpected event"),
3667                         })
3668                 };
3669
3670                 macro_rules! get_closing_signed_broadcast {
3671                         ($node: expr, $dest_pubkey: expr) => {
3672                                 {
3673                                         let events = $node.get_and_clear_pending_msg_events();
3674                                         assert!(events.len() == 1 || events.len() == 2);
3675                                         (match events[events.len() - 1] {
3676                                                 MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
3677                                                         msg.clone()
3678                                                 },
3679                                                 _ => panic!("Unexpected event"),
3680                                         }, if events.len() == 2 {
3681                                                 match events[0] {
3682                                                         MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
3683                                                                 assert_eq!(*node_id, $dest_pubkey);
3684                                                                 Some(msg.clone())
3685                                                         },
3686                                                         _ => panic!("Unexpected event"),
3687                                                 }
3688                                         } else { None })
3689                                 }
3690                         }
3691                 }
3692
3693                 node_a.handle_shutdown(&node_b.get_our_node_id(), &shutdown_b).unwrap();
3694                 let (as_update, bs_update) = if close_inbound_first {
3695                         assert!(node_a.get_and_clear_pending_msg_events().is_empty());
3696                         node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
3697                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
3698                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
3699                         let (as_update, closing_signed_a) = get_closing_signed_broadcast!(node_a, node_b.get_our_node_id());
3700
3701                         node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
3702                         let (bs_update, none_b) = get_closing_signed_broadcast!(node_b, node_a.get_our_node_id());
3703                         assert!(none_b.is_none());
3704                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
3705                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
3706                         (as_update, bs_update)
3707                 } else {
3708                         let closing_signed_a = get_event_msg!(struct_a, MessageSendEvent::SendClosingSigned, node_b.get_our_node_id());
3709
3710                         node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a).unwrap();
3711                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
3712                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
3713                         let (bs_update, closing_signed_b) = get_closing_signed_broadcast!(node_b, node_a.get_our_node_id());
3714
3715                         node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
3716                         let (as_update, none_a) = get_closing_signed_broadcast!(node_a, node_b.get_our_node_id());
3717                         assert!(none_a.is_none());
3718                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
3719                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
3720                         (as_update, bs_update)
3721                 };
3722                 assert_eq!(tx_a, tx_b);
3723                 check_spends!(tx_a, funding_tx);
3724
3725                 (as_update, bs_update)
3726         }
3727
3728         struct SendEvent {
3729                 node_id: PublicKey,
3730                 msgs: Vec<msgs::UpdateAddHTLC>,
3731                 commitment_msg: msgs::CommitmentSigned,
3732         }
3733         impl SendEvent {
3734                 fn from_commitment_update(node_id: PublicKey, updates: msgs::CommitmentUpdate) -> SendEvent {
3735                         assert!(updates.update_fulfill_htlcs.is_empty());
3736                         assert!(updates.update_fail_htlcs.is_empty());
3737                         assert!(updates.update_fail_malformed_htlcs.is_empty());
3738                         assert!(updates.update_fee.is_none());
3739                         SendEvent { node_id: node_id, msgs: updates.update_add_htlcs, commitment_msg: updates.commitment_signed }
3740                 }
3741
3742                 fn from_event(event: MessageSendEvent) -> SendEvent {
3743                         match event {
3744                                 MessageSendEvent::UpdateHTLCs { node_id, updates } => SendEvent::from_commitment_update(node_id, updates),
3745                                 _ => panic!("Unexpected event type!"),
3746                         }
3747                 }
3748         }
3749
3750         macro_rules! check_added_monitors {
3751                 ($node: expr, $count: expr) => {
3752                         {
3753                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
3754                                 assert_eq!(added_monitors.len(), $count);
3755                                 added_monitors.clear();
3756                         }
3757                 }
3758         }
3759
3760         macro_rules! commitment_signed_dance {
3761                 ($node_a: expr, $node_b: expr, $commitment_signed: expr, $fail_backwards: expr) => {
3762                         {
3763                                 check_added_monitors!($node_a, 0);
3764                                 assert!($node_a.node.get_and_clear_pending_msg_events().is_empty());
3765                                 $node_a.node.handle_commitment_signed(&$node_b.node.get_our_node_id(), &$commitment_signed).unwrap();
3766                                 let (as_revoke_and_ack, as_commitment_signed) = get_revoke_commit_msgs!($node_a, $node_b.node.get_our_node_id());
3767                                 check_added_monitors!($node_a, 1);
3768                                 check_added_monitors!($node_b, 0);
3769                                 assert!($node_b.node.get_and_clear_pending_msg_events().is_empty());
3770                                 $node_b.node.handle_revoke_and_ack(&$node_a.node.get_our_node_id(), &as_revoke_and_ack).unwrap();
3771                                 assert!($node_b.node.get_and_clear_pending_msg_events().is_empty());
3772                                 check_added_monitors!($node_b, 1);
3773                                 $node_b.node.handle_commitment_signed(&$node_a.node.get_our_node_id(), &as_commitment_signed).unwrap();
3774                                 let bs_revoke_and_ack = get_event_msg!($node_b, MessageSendEvent::SendRevokeAndACK, $node_a.node.get_our_node_id());
3775                                 check_added_monitors!($node_b, 1);
3776                                 if $fail_backwards {
3777                                         assert!($node_a.node.get_and_clear_pending_events().is_empty());
3778                                         assert!($node_a.node.get_and_clear_pending_msg_events().is_empty());
3779                                 }
3780                                 $node_a.node.handle_revoke_and_ack(&$node_b.node.get_our_node_id(), &bs_revoke_and_ack).unwrap();
3781                                 if $fail_backwards {
3782                                         let channel_state = $node_a.node.channel_state.lock().unwrap();
3783                                         assert_eq!(channel_state.pending_msg_events.len(), 1);
3784                                         if let MessageSendEvent::UpdateHTLCs { ref node_id, .. } = channel_state.pending_msg_events[0] {
3785                                                 assert_ne!(*node_id, $node_b.node.get_our_node_id());
3786                                         } else { panic!("Unexpected event"); }
3787                                 } else {
3788                                         assert!($node_a.node.get_and_clear_pending_msg_events().is_empty());
3789                                 }
3790                                 {
3791                                         let mut added_monitors = $node_a.chan_monitor.added_monitors.lock().unwrap();
3792                                         if $fail_backwards {
3793                                                 assert_eq!(added_monitors.len(), 2);
3794                                                 assert!(added_monitors[0].0 != added_monitors[1].0);
3795                                         } else {
3796                                                 assert_eq!(added_monitors.len(), 1);
3797                                         }
3798                                         added_monitors.clear();
3799                                 }
3800                         }
3801                 }
3802         }
3803
3804         macro_rules! get_payment_preimage_hash {
3805                 ($node: expr) => {
3806                         {
3807                                 let payment_preimage = [*$node.network_payment_count.borrow(); 32];
3808                                 *$node.network_payment_count.borrow_mut() += 1;
3809                                 let mut payment_hash = [0; 32];
3810                                 let mut sha = Sha256::new();
3811                                 sha.input(&payment_preimage[..]);
3812                                 sha.result(&mut payment_hash);
3813                                 (payment_preimage, payment_hash)
3814                         }
3815                 }
3816         }
3817
3818         fn send_along_route(origin_node: &Node, route: Route, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
3819                 let (our_payment_preimage, our_payment_hash) = get_payment_preimage_hash!(origin_node);
3820
3821                 let mut payment_event = {
3822                         origin_node.node.send_payment(route, our_payment_hash).unwrap();
3823                         check_added_monitors!(origin_node, 1);
3824
3825                         let mut events = origin_node.node.get_and_clear_pending_msg_events();
3826                         assert_eq!(events.len(), 1);
3827                         SendEvent::from_event(events.remove(0))
3828                 };
3829                 let mut prev_node = origin_node;
3830
3831                 for (idx, &node) in expected_route.iter().enumerate() {
3832                         assert_eq!(node.node.get_our_node_id(), payment_event.node_id);
3833
3834                         node.node.handle_update_add_htlc(&prev_node.node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
3835                         check_added_monitors!(node, 0);
3836                         commitment_signed_dance!(node, prev_node, payment_event.commitment_msg, false);
3837
3838                         let events_1 = node.node.get_and_clear_pending_events();
3839                         assert_eq!(events_1.len(), 1);
3840                         match events_1[0] {
3841                                 Event::PendingHTLCsForwardable { .. } => { },
3842                                 _ => panic!("Unexpected event"),
3843                         };
3844
3845                         node.node.channel_state.lock().unwrap().next_forward = Instant::now();
3846                         node.node.process_pending_htlc_forwards();
3847
3848                         if idx == expected_route.len() - 1 {
3849                                 let events_2 = node.node.get_and_clear_pending_events();
3850                                 assert_eq!(events_2.len(), 1);
3851                                 match events_2[0] {
3852                                         Event::PaymentReceived { ref payment_hash, amt } => {
3853                                                 assert_eq!(our_payment_hash, *payment_hash);
3854                                                 assert_eq!(amt, recv_value);
3855                                         },
3856                                         _ => panic!("Unexpected event"),
3857                                 }
3858                         } else {
3859                                 let mut events_2 = node.node.get_and_clear_pending_msg_events();
3860                                 assert_eq!(events_2.len(), 1);
3861                                 check_added_monitors!(node, 1);
3862                                 payment_event = SendEvent::from_event(events_2.remove(0));
3863                                 assert_eq!(payment_event.msgs.len(), 1);
3864                         }
3865
3866                         prev_node = node;
3867                 }
3868
3869                 (our_payment_preimage, our_payment_hash)
3870         }
3871
3872         fn claim_payment_along_route(origin_node: &Node, expected_route: &[&Node], skip_last: bool, our_payment_preimage: [u8; 32]) {
3873                 assert!(expected_route.last().unwrap().node.claim_funds(our_payment_preimage));
3874                 check_added_monitors!(expected_route.last().unwrap(), 1);
3875
3876                 let mut next_msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)> = None;
3877                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
3878                 macro_rules! get_next_msgs {
3879                         ($node: expr) => {
3880                                 {
3881                                         let events = $node.node.get_and_clear_pending_msg_events();
3882                                         assert_eq!(events.len(), 1);
3883                                         match events[0] {
3884                                                 MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
3885                                                         assert!(update_add_htlcs.is_empty());
3886                                                         assert_eq!(update_fulfill_htlcs.len(), 1);
3887                                                         assert!(update_fail_htlcs.is_empty());
3888                                                         assert!(update_fail_malformed_htlcs.is_empty());
3889                                                         assert!(update_fee.is_none());
3890                                                         expected_next_node = node_id.clone();
3891                                                         Some((update_fulfill_htlcs[0].clone(), commitment_signed.clone()))
3892                                                 },
3893                                                 _ => panic!("Unexpected event"),
3894                                         }
3895                                 }
3896                         }
3897                 }
3898
3899                 macro_rules! last_update_fulfill_dance {
3900                         ($node: expr, $prev_node: expr) => {
3901                                 {
3902                                         $node.node.handle_update_fulfill_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
3903                                         check_added_monitors!($node, 0);
3904                                         assert!($node.node.get_and_clear_pending_msg_events().is_empty());
3905                                         commitment_signed_dance!($node, $prev_node, next_msgs.as_ref().unwrap().1, false);
3906                                 }
3907                         }
3908                 }
3909                 macro_rules! mid_update_fulfill_dance {
3910                         ($node: expr, $prev_node: expr, $new_msgs: expr) => {
3911                                 {
3912                                         $node.node.handle_update_fulfill_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
3913                                         check_added_monitors!($node, 1);
3914                                         let new_next_msgs = if $new_msgs {
3915                                                 get_next_msgs!($node)
3916                                         } else {
3917                                                 assert!($node.node.get_and_clear_pending_msg_events().is_empty());
3918                                                 None
3919                                         };
3920                                         commitment_signed_dance!($node, $prev_node, next_msgs.as_ref().unwrap().1, false);
3921                                         next_msgs = new_next_msgs;
3922                                 }
3923                         }
3924                 }
3925
3926                 let mut prev_node = expected_route.last().unwrap();
3927                 for (idx, node) in expected_route.iter().rev().enumerate() {
3928                         assert_eq!(expected_next_node, node.node.get_our_node_id());
3929                         let update_next_msgs = !skip_last || idx != expected_route.len() - 1;
3930                         if next_msgs.is_some() {
3931                                 mid_update_fulfill_dance!(node, prev_node, update_next_msgs);
3932                         } else if update_next_msgs {
3933                                 next_msgs = get_next_msgs!(node);
3934                         } else {
3935                                 assert!(node.node.get_and_clear_pending_msg_events().is_empty());
3936                         }
3937                         if !skip_last && idx == expected_route.len() - 1 {
3938                                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
3939                         }
3940
3941                         prev_node = node;
3942                 }
3943
3944                 if !skip_last {
3945                         last_update_fulfill_dance!(origin_node, expected_route.first().unwrap());
3946                         let events = origin_node.node.get_and_clear_pending_events();
3947                         assert_eq!(events.len(), 1);
3948                         match events[0] {
3949                                 Event::PaymentSent { payment_preimage } => {
3950                                         assert_eq!(payment_preimage, our_payment_preimage);
3951                                 },
3952                                 _ => panic!("Unexpected event"),
3953                         }
3954                 }
3955         }
3956
3957         fn claim_payment(origin_node: &Node, expected_route: &[&Node], our_payment_preimage: [u8; 32]) {
3958                 claim_payment_along_route(origin_node, expected_route, false, our_payment_preimage);
3959         }
3960
3961         const TEST_FINAL_CLTV: u32 = 32;
3962
3963         fn route_payment(origin_node: &Node, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
3964                 let route = origin_node.router.get_route(&expected_route.last().unwrap().node.get_our_node_id(), None, &Vec::new(), recv_value, TEST_FINAL_CLTV).unwrap();
3965                 assert_eq!(route.hops.len(), expected_route.len());
3966                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
3967                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
3968                 }
3969
3970                 send_along_route(origin_node, route, expected_route, recv_value)
3971         }
3972
3973         fn route_over_limit(origin_node: &Node, expected_route: &[&Node], recv_value: u64) {
3974                 let route = origin_node.router.get_route(&expected_route.last().unwrap().node.get_our_node_id(), None, &Vec::new(), recv_value, TEST_FINAL_CLTV).unwrap();
3975                 assert_eq!(route.hops.len(), expected_route.len());
3976                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
3977                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
3978                 }
3979
3980                 let (_, our_payment_hash) = get_payment_preimage_hash!(origin_node);
3981
3982                 let err = origin_node.node.send_payment(route, our_payment_hash).err().unwrap();
3983                 match err {
3984                         APIError::ChannelUnavailable{err} => assert_eq!(err, "Cannot send value that would put us over our max HTLC value in flight"),
3985                         _ => panic!("Unknown error variants"),
3986                 };
3987         }
3988
3989         fn send_payment(origin: &Node, expected_route: &[&Node], recv_value: u64) {
3990                 let our_payment_preimage = route_payment(&origin, expected_route, recv_value).0;
3991                 claim_payment(&origin, expected_route, our_payment_preimage);
3992         }
3993
3994         fn fail_payment_along_route(origin_node: &Node, expected_route: &[&Node], skip_last: bool, our_payment_hash: [u8; 32]) {
3995                 assert!(expected_route.last().unwrap().node.fail_htlc_backwards(&our_payment_hash, PaymentFailReason::PreimageUnknown));
3996                 check_added_monitors!(expected_route.last().unwrap(), 1);
3997
3998                 let mut next_msgs: Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)> = None;
3999                 macro_rules! update_fail_dance {
4000                         ($node: expr, $prev_node: expr, $last_node: expr) => {
4001                                 {
4002                                         $node.node.handle_update_fail_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
4003                                         commitment_signed_dance!($node, $prev_node, next_msgs.as_ref().unwrap().1, !$last_node);
4004                                 }
4005                         }
4006                 }
4007
4008                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
4009                 let mut prev_node = expected_route.last().unwrap();
4010                 for (idx, node) in expected_route.iter().rev().enumerate() {
4011                         assert_eq!(expected_next_node, node.node.get_our_node_id());
4012                         if next_msgs.is_some() {
4013                                 // We may be the "last node" for the purpose of the commitment dance if we're
4014                                 // skipping the last node (implying it is disconnected) and we're the
4015                                 // second-to-last node!
4016                                 update_fail_dance!(node, prev_node, skip_last && idx == expected_route.len() - 1);
4017                         }
4018
4019                         let events = node.node.get_and_clear_pending_msg_events();
4020                         if !skip_last || idx != expected_route.len() - 1 {
4021                                 assert_eq!(events.len(), 1);
4022                                 match events[0] {
4023                                         MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
4024                                                 assert!(update_add_htlcs.is_empty());
4025                                                 assert!(update_fulfill_htlcs.is_empty());
4026                                                 assert_eq!(update_fail_htlcs.len(), 1);
4027                                                 assert!(update_fail_malformed_htlcs.is_empty());
4028                                                 assert!(update_fee.is_none());
4029                                                 expected_next_node = node_id.clone();
4030                                                 next_msgs = Some((update_fail_htlcs[0].clone(), commitment_signed.clone()));
4031                                         },
4032                                         _ => panic!("Unexpected event"),
4033                                 }
4034                         } else {
4035                                 assert!(events.is_empty());
4036                         }
4037                         if !skip_last && idx == expected_route.len() - 1 {
4038                                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
4039                         }
4040
4041                         prev_node = node;
4042                 }
4043
4044                 if !skip_last {
4045                         update_fail_dance!(origin_node, expected_route.first().unwrap(), true);
4046
4047                         let events = origin_node.node.get_and_clear_pending_events();
4048                         assert_eq!(events.len(), 1);
4049                         match events[0] {
4050                                 Event::PaymentFailed { payment_hash, rejected_by_dest } => {
4051                                         assert_eq!(payment_hash, our_payment_hash);
4052                                         assert!(rejected_by_dest);
4053                                 },
4054                                 _ => panic!("Unexpected event"),
4055                         }
4056                 }
4057         }
4058
4059         fn fail_payment(origin_node: &Node, expected_route: &[&Node], our_payment_hash: [u8; 32]) {
4060                 fail_payment_along_route(origin_node, expected_route, false, our_payment_hash);
4061         }
4062
4063         fn create_network(node_count: usize) -> Vec<Node> {
4064                 let mut nodes = Vec::new();
4065                 let mut rng = thread_rng();
4066                 let secp_ctx = Secp256k1::new();
4067                 let logger: Arc<Logger> = Arc::new(test_utils::TestLogger::new());
4068
4069                 let chan_count = Rc::new(RefCell::new(0));
4070                 let payment_count = Rc::new(RefCell::new(0));
4071
4072                 for _ in 0..node_count {
4073                         let feeest = Arc::new(test_utils::TestFeeEstimator { sat_per_kw: 253 });
4074                         let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new(Network::Testnet, Arc::clone(&logger)));
4075                         let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
4076                         let mut seed = [0; 32];
4077                         rng.fill_bytes(&mut seed);
4078                         let keys_manager = Arc::new(keysinterface::KeysManager::new(&seed, Network::Testnet, Arc::clone(&logger)));
4079                         let chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor.clone(), tx_broadcaster.clone(), logger.clone()));
4080                         let mut config = UserConfig::new();
4081                         config.channel_options.announced_channel = true;
4082                         config.channel_limits.force_announced_channel_preference = false;
4083                         let node = ChannelManager::new(Network::Testnet, feeest.clone(), chan_monitor.clone(), chain_monitor.clone(), tx_broadcaster.clone(), Arc::clone(&logger), keys_manager.clone(), config).unwrap();
4084                         let router = Router::new(PublicKey::from_secret_key(&secp_ctx, &keys_manager.get_node_secret()), chain_monitor.clone(), Arc::clone(&logger));
4085                         nodes.push(Node { chain_monitor, tx_broadcaster, chan_monitor, node, router, node_seed: seed,
4086                                 network_payment_count: payment_count.clone(),
4087                                 network_chan_count: chan_count.clone(),
4088                         });
4089                 }
4090
4091                 nodes
4092         }
4093
4094         #[test]
4095         fn test_async_inbound_update_fee() {
4096                 let mut nodes = create_network(2);
4097                 let chan = create_announced_chan_between_nodes(&nodes, 0, 1);
4098                 let channel_id = chan.2;
4099
4100                 macro_rules! get_feerate {
4101                         ($node: expr) => {{
4102                                 let chan_lock = $node.node.channel_state.lock().unwrap();
4103                                 let chan = chan_lock.by_id.get(&channel_id).unwrap();
4104                                 chan.get_feerate()
4105                         }}
4106                 }
4107
4108                 // balancing
4109                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
4110
4111                 // A                                        B
4112                 // update_fee                            ->
4113                 // send (1) commitment_signed            -.
4114                 //                                       <- update_add_htlc/commitment_signed
4115                 // send (2) RAA (awaiting remote revoke) -.
4116                 // (1) commitment_signed is delivered    ->
4117                 //                                       .- send (3) RAA (awaiting remote revoke)
4118                 // (2) RAA is delivered                  ->
4119                 //                                       .- send (4) commitment_signed
4120                 //                                       <- (3) RAA is delivered
4121                 // send (5) commitment_signed            -.
4122                 //                                       <- (4) commitment_signed is delivered
4123                 // send (6) RAA                          -.
4124                 // (5) commitment_signed is delivered    ->
4125                 //                                       <- RAA
4126                 // (6) RAA is delivered                  ->
4127
4128                 // First nodes[0] generates an update_fee
4129                 nodes[0].node.update_fee(channel_id, get_feerate!(nodes[0]) + 20).unwrap();
4130                 check_added_monitors!(nodes[0], 1);
4131
4132                 let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
4133                 assert_eq!(events_0.len(), 1);
4134                 let (update_msg, commitment_signed) = match events_0[0] { // (1)
4135                         MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, ref commitment_signed, .. }, .. } => {
4136                                 (update_fee.as_ref(), commitment_signed)
4137                         },
4138                         _ => panic!("Unexpected event"),
4139                 };
4140
4141                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap()).unwrap();
4142
4143                 // ...but before it's delivered, nodes[1] starts to send a payment back to nodes[0]...
4144                 let (_, our_payment_hash) = get_payment_preimage_hash!(nodes[0]);
4145                 nodes[1].node.send_payment(nodes[1].router.get_route(&nodes[0].node.get_our_node_id(), None, &Vec::new(), 40000, TEST_FINAL_CLTV).unwrap(), our_payment_hash).unwrap();
4146                 check_added_monitors!(nodes[1], 1);
4147
4148                 let payment_event = {
4149                         let mut events_1 = nodes[1].node.get_and_clear_pending_msg_events();
4150                         assert_eq!(events_1.len(), 1);
4151                         SendEvent::from_event(events_1.remove(0))
4152                 };
4153                 assert_eq!(payment_event.node_id, nodes[0].node.get_our_node_id());
4154                 assert_eq!(payment_event.msgs.len(), 1);
4155
4156                 // ...now when the messages get delivered everyone should be happy
4157                 nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
4158                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &payment_event.commitment_msg).unwrap(); // (2)
4159                 let as_revoke_and_ack = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
4160                 // nodes[0] is awaiting nodes[1] revoke_and_ack so get_event_msg's assert(len == 1) passes
4161                 check_added_monitors!(nodes[0], 1);
4162
4163                 // deliver(1), generate (3):
4164                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed).unwrap();
4165                 let bs_revoke_and_ack = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
4166                 // nodes[1] is awaiting nodes[0] revoke_and_ack so get_event_msg's assert(len == 1) passes
4167                 check_added_monitors!(nodes[1], 1);
4168
4169                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_and_ack).unwrap(); // deliver (2)
4170                 let bs_update = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
4171                 assert!(bs_update.update_add_htlcs.is_empty()); // (4)
4172                 assert!(bs_update.update_fulfill_htlcs.is_empty()); // (4)
4173                 assert!(bs_update.update_fail_htlcs.is_empty()); // (4)
4174                 assert!(bs_update.update_fail_malformed_htlcs.is_empty()); // (4)
4175                 assert!(bs_update.update_fee.is_none()); // (4)
4176                 check_added_monitors!(nodes[1], 1);
4177
4178                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_and_ack).unwrap(); // deliver (3)
4179                 let as_update = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
4180                 assert!(as_update.update_add_htlcs.is_empty()); // (5)
4181                 assert!(as_update.update_fulfill_htlcs.is_empty()); // (5)
4182                 assert!(as_update.update_fail_htlcs.is_empty()); // (5)
4183                 assert!(as_update.update_fail_malformed_htlcs.is_empty()); // (5)
4184                 assert!(as_update.update_fee.is_none()); // (5)
4185                 check_added_monitors!(nodes[0], 1);
4186
4187                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_update.commitment_signed).unwrap(); // deliver (4)
4188                 let as_second_revoke = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
4189                 // only (6) so get_event_msg's assert(len == 1) passes
4190                 check_added_monitors!(nodes[0], 1);
4191
4192                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_update.commitment_signed).unwrap(); // deliver (5)
4193                 let bs_second_revoke = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
4194                 check_added_monitors!(nodes[1], 1);
4195
4196                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_second_revoke).unwrap();
4197                 check_added_monitors!(nodes[0], 1);
4198
4199                 let events_2 = nodes[0].node.get_and_clear_pending_events();
4200                 assert_eq!(events_2.len(), 1);
4201                 match events_2[0] {
4202                         Event::PendingHTLCsForwardable {..} => {}, // If we actually processed we'd receive the payment
4203                         _ => panic!("Unexpected event"),
4204                 }
4205
4206                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_second_revoke).unwrap(); // deliver (6)
4207                 check_added_monitors!(nodes[1], 1);
4208         }
4209
4210         #[test]
4211         fn test_update_fee_unordered_raa() {
4212                 // Just the intro to the previous test followed by an out-of-order RAA (which caused a
4213                 // crash in an earlier version of the update_fee patch)
4214                 let mut nodes = create_network(2);
4215                 let chan = create_announced_chan_between_nodes(&nodes, 0, 1);
4216                 let channel_id = chan.2;
4217
4218                 macro_rules! get_feerate {
4219                         ($node: expr) => {{
4220                                 let chan_lock = $node.node.channel_state.lock().unwrap();
4221                                 let chan = chan_lock.by_id.get(&channel_id).unwrap();
4222                                 chan.get_feerate()
4223                         }}
4224                 }
4225
4226                 // balancing
4227                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
4228
4229                 // First nodes[0] generates an update_fee
4230                 nodes[0].node.update_fee(channel_id, get_feerate!(nodes[0]) + 20).unwrap();
4231                 check_added_monitors!(nodes[0], 1);
4232
4233                 let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
4234                 assert_eq!(events_0.len(), 1);
4235                 let update_msg = match events_0[0] { // (1)
4236                         MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, .. }, .. } => {
4237                                 update_fee.as_ref()
4238                         },
4239                         _ => panic!("Unexpected event"),
4240                 };
4241
4242                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap()).unwrap();
4243
4244                 // ...but before it's delivered, nodes[1] starts to send a payment back to nodes[0]...
4245                 let (_, our_payment_hash) = get_payment_preimage_hash!(nodes[0]);
4246                 nodes[1].node.send_payment(nodes[1].router.get_route(&nodes[0].node.get_our_node_id(), None, &Vec::new(), 40000, TEST_FINAL_CLTV).unwrap(), our_payment_hash).unwrap();
4247                 check_added_monitors!(nodes[1], 1);
4248
4249                 let payment_event = {
4250                         let mut events_1 = nodes[1].node.get_and_clear_pending_msg_events();
4251                         assert_eq!(events_1.len(), 1);
4252                         SendEvent::from_event(events_1.remove(0))
4253                 };
4254                 assert_eq!(payment_event.node_id, nodes[0].node.get_our_node_id());
4255                 assert_eq!(payment_event.msgs.len(), 1);
4256
4257                 // ...now when the messages get delivered everyone should be happy
4258                 nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
4259                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &payment_event.commitment_msg).unwrap(); // (2)
4260                 let as_revoke_msg = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
4261                 // nodes[0] is awaiting nodes[1] revoke_and_ack so get_event_msg's assert(len == 1) passes
4262                 check_added_monitors!(nodes[0], 1);
4263
4264                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_msg).unwrap(); // deliver (2)
4265                 check_added_monitors!(nodes[1], 1);
4266
4267                 // We can't continue, sadly, because our (1) now has a bogus signature
4268         }
4269
4270         #[test]
4271         fn test_multi_flight_update_fee() {
4272                 let nodes = create_network(2);
4273                 let chan = create_announced_chan_between_nodes(&nodes, 0, 1);
4274                 let channel_id = chan.2;
4275
4276                 macro_rules! get_feerate {
4277                         ($node: expr) => {{
4278                                 let chan_lock = $node.node.channel_state.lock().unwrap();
4279                                 let chan = chan_lock.by_id.get(&channel_id).unwrap();
4280                                 chan.get_feerate()
4281                         }}
4282                 }
4283
4284                 // A                                        B
4285                 // update_fee/commitment_signed          ->
4286                 //                                       .- send (1) RAA and (2) commitment_signed
4287                 // update_fee (never committed)          ->
4288                 // (3) update_fee                        ->
4289                 // We have to manually generate the above update_fee, it is allowed by the protocol but we
4290                 // don't track which updates correspond to which revoke_and_ack responses so we're in
4291                 // AwaitingRAA mode and will not generate the update_fee yet.
4292                 //                                       <- (1) RAA delivered
4293                 // (3) is generated and send (4) CS      -.
4294                 // Note that A cannot generate (4) prior to (1) being delivered as it otherwise doesn't
4295                 // know the per_commitment_point to use for it.
4296                 //                                       <- (2) commitment_signed delivered
4297                 // revoke_and_ack                        ->
4298                 //                                          B should send no response here
4299                 // (4) commitment_signed delivered       ->
4300                 //                                       <- RAA/commitment_signed delivered
4301                 // revoke_and_ack                        ->
4302
4303                 // First nodes[0] generates an update_fee
4304                 let initial_feerate = get_feerate!(nodes[0]);
4305                 nodes[0].node.update_fee(channel_id, initial_feerate + 20).unwrap();
4306                 check_added_monitors!(nodes[0], 1);
4307
4308                 let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
4309                 assert_eq!(events_0.len(), 1);
4310                 let (update_msg_1, commitment_signed_1) = match events_0[0] { // (1)
4311                         MessageSendEvent::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, ref commitment_signed, .. }, .. } => {
4312                                 (update_fee.as_ref().unwrap(), commitment_signed)
4313                         },
4314                         _ => panic!("Unexpected event"),
4315                 };
4316
4317                 // Deliver first update_fee/commitment_signed pair, generating (1) and (2):
4318                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg_1).unwrap();
4319                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed_1).unwrap();
4320                 let (bs_revoke_msg, bs_commitment_signed) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
4321                 check_added_monitors!(nodes[1], 1);
4322
4323                 // nodes[0] is awaiting a revoke from nodes[1] before it will create a new commitment
4324                 // transaction:
4325                 nodes[0].node.update_fee(channel_id, initial_feerate + 40).unwrap();
4326                 assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
4327                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
4328
4329                 // Create the (3) update_fee message that nodes[0] will generate before it does...
4330                 let mut update_msg_2 = msgs::UpdateFee {
4331                         channel_id: update_msg_1.channel_id.clone(),
4332                         feerate_per_kw: (initial_feerate + 30) as u32,
4333                 };
4334
4335                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), &update_msg_2).unwrap();
4336
4337                 update_msg_2.feerate_per_kw = (initial_feerate + 40) as u32;
4338                 // Deliver (3)
4339                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), &update_msg_2).unwrap();
4340
4341                 // Deliver (1), generating (3) and (4)
4342                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_msg).unwrap();
4343                 let as_second_update = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
4344                 check_added_monitors!(nodes[0], 1);
4345                 assert!(as_second_update.update_add_htlcs.is_empty());
4346                 assert!(as_second_update.update_fulfill_htlcs.is_empty());
4347                 assert!(as_second_update.update_fail_htlcs.is_empty());
4348                 assert!(as_second_update.update_fail_malformed_htlcs.is_empty());
4349                 // Check that the update_fee newly generated matches what we delivered:
4350                 assert_eq!(as_second_update.update_fee.as_ref().unwrap().channel_id, update_msg_2.channel_id);
4351                 assert_eq!(as_second_update.update_fee.as_ref().unwrap().feerate_per_kw, update_msg_2.feerate_per_kw);
4352
4353                 // Deliver (2) commitment_signed
4354                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_commitment_signed).unwrap();
4355                 let as_revoke_msg = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
4356                 check_added_monitors!(nodes[0], 1);
4357                 // No commitment_signed so get_event_msg's assert(len == 1) passes
4358
4359                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_msg).unwrap();
4360                 assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
4361                 check_added_monitors!(nodes[1], 1);
4362
4363                 // Delever (4)
4364                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_second_update.commitment_signed).unwrap();
4365                 let (bs_second_revoke, bs_second_commitment) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
4366                 check_added_monitors!(nodes[1], 1);
4367
4368                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_second_revoke).unwrap();
4369                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
4370                 check_added_monitors!(nodes[0], 1);
4371
4372                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_second_commitment).unwrap();
4373                 let as_second_revoke = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
4374                 // No commitment_signed so get_event_msg's assert(len == 1) passes
4375                 check_added_monitors!(nodes[0], 1);
4376
4377                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_second_revoke).unwrap();
4378                 assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
4379                 check_added_monitors!(nodes[1], 1);
4380         }
4381
4382         #[test]
4383         fn test_update_fee_vanilla() {
4384                 let nodes = create_network(2);
4385                 let chan = create_announced_chan_between_nodes(&nodes, 0, 1);
4386                 let channel_id = chan.2;
4387
4388                 macro_rules! get_feerate {
4389                         ($node: expr) => {{
4390                                 let chan_lock = $node.node.channel_state.lock().unwrap();
4391                                 let chan = chan_lock.by_id.get(&channel_id).unwrap();
4392                                 chan.get_feerate()
4393                         }}
4394                 }
4395
4396                 let feerate = get_feerate!(nodes[0]);
4397                 nodes[0].node.update_fee(channel_id, feerate+20).unwrap();
4398                 check_added_monitors!(nodes[0], 1);
4399
4400                 let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
4401                 assert_eq!(events_0.len(), 1);
4402                 let (update_msg, commitment_signed) = match events_0[0] {
4403                                 MessageSendEvent::UpdateHTLCs { node_id:_, updates: msgs::CommitmentUpdate { update_add_htlcs:_, update_fulfill_htlcs:_, update_fail_htlcs:_, update_fail_malformed_htlcs:_, ref update_fee, ref commitment_signed } } => {
4404                                 (update_fee.as_ref(), commitment_signed)
4405                         },
4406                         _ => panic!("Unexpected event"),
4407                 };
4408                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap()).unwrap();
4409
4410                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed).unwrap();
4411                 let (revoke_msg, commitment_signed) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
4412                 check_added_monitors!(nodes[1], 1);
4413
4414                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_msg).unwrap();
4415                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
4416                 check_added_monitors!(nodes[0], 1);
4417
4418                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed).unwrap();
4419                 let revoke_msg = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
4420                 // No commitment_signed so get_event_msg's assert(len == 1) passes
4421                 check_added_monitors!(nodes[0], 1);
4422
4423                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke_msg).unwrap();
4424                 assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
4425                 check_added_monitors!(nodes[1], 1);
4426         }
4427
4428         #[test]
4429         fn test_update_fee_with_fundee_update_add_htlc() {
4430                 let mut nodes = create_network(2);
4431                 let chan = create_announced_chan_between_nodes(&nodes, 0, 1);
4432                 let channel_id = chan.2;
4433
4434                 macro_rules! get_feerate {
4435                         ($node: expr) => {{
4436                                 let chan_lock = $node.node.channel_state.lock().unwrap();
4437                                 let chan = chan_lock.by_id.get(&channel_id).unwrap();
4438                                 chan.get_feerate()
4439                         }}
4440                 }
4441
4442                 // balancing
4443                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
4444
4445                 let feerate = get_feerate!(nodes[0]);
4446                 nodes[0].node.update_fee(channel_id, feerate+20).unwrap();
4447                 check_added_monitors!(nodes[0], 1);
4448
4449                 let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
4450                 assert_eq!(events_0.len(), 1);
4451                 let (update_msg, commitment_signed) = match events_0[0] {
4452                                 MessageSendEvent::UpdateHTLCs { node_id:_, updates: msgs::CommitmentUpdate { update_add_htlcs:_, update_fulfill_htlcs:_, update_fail_htlcs:_, update_fail_malformed_htlcs:_, ref update_fee, ref commitment_signed } } => {
4453                                 (update_fee.as_ref(), commitment_signed)
4454                         },
4455                         _ => panic!("Unexpected event"),
4456                 };
4457                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap()).unwrap();
4458                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed).unwrap();
4459                 let (revoke_msg, commitment_signed) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
4460                 check_added_monitors!(nodes[1], 1);
4461
4462                 let route = nodes[1].router.get_route(&nodes[0].node.get_our_node_id(), None, &Vec::new(), 800000, TEST_FINAL_CLTV).unwrap();
4463
4464                 let (our_payment_preimage, our_payment_hash) = get_payment_preimage_hash!(nodes[1]);
4465
4466                 // nothing happens since node[1] is in AwaitingRemoteRevoke
4467                 nodes[1].node.send_payment(route, our_payment_hash).unwrap();
4468                 {
4469                         let mut added_monitors = nodes[0].chan_monitor.added_monitors.lock().unwrap();
4470                         assert_eq!(added_monitors.len(), 0);
4471                         added_monitors.clear();
4472                 }
4473                 assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
4474                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
4475                 // node[1] has nothing to do
4476
4477                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_msg).unwrap();
4478                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
4479                 check_added_monitors!(nodes[0], 1);
4480
4481                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed).unwrap();
4482                 let revoke_msg = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
4483                 // No commitment_signed so get_event_msg's assert(len == 1) passes
4484                 check_added_monitors!(nodes[0], 1);
4485                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke_msg).unwrap();
4486                 check_added_monitors!(nodes[1], 1);
4487                 // AwaitingRemoteRevoke ends here
4488
4489                 let commitment_update = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
4490                 assert_eq!(commitment_update.update_add_htlcs.len(), 1);
4491                 assert_eq!(commitment_update.update_fulfill_htlcs.len(), 0);
4492                 assert_eq!(commitment_update.update_fail_htlcs.len(), 0);
4493                 assert_eq!(commitment_update.update_fail_malformed_htlcs.len(), 0);
4494                 assert_eq!(commitment_update.update_fee.is_none(), true);
4495
4496                 nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &commitment_update.update_add_htlcs[0]).unwrap();
4497                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_update.commitment_signed).unwrap();
4498                 check_added_monitors!(nodes[0], 1);
4499                 let (revoke, commitment_signed) = get_revoke_commit_msgs!(nodes[0], nodes[1].node.get_our_node_id());
4500
4501                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke).unwrap();
4502                 check_added_monitors!(nodes[1], 1);
4503                 assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
4504
4505                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &commitment_signed).unwrap();
4506                 check_added_monitors!(nodes[1], 1);
4507                 let revoke = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
4508                 // No commitment_signed so get_event_msg's assert(len == 1) passes
4509
4510                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke).unwrap();
4511                 check_added_monitors!(nodes[0], 1);
4512                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
4513
4514                 let events = nodes[0].node.get_and_clear_pending_events();
4515                 assert_eq!(events.len(), 1);
4516                 match events[0] {
4517                         Event::PendingHTLCsForwardable { .. } => { },
4518                         _ => panic!("Unexpected event"),
4519                 };
4520                 nodes[0].node.channel_state.lock().unwrap().next_forward = Instant::now();
4521                 nodes[0].node.process_pending_htlc_forwards();
4522
4523                 let events = nodes[0].node.get_and_clear_pending_events();
4524                 assert_eq!(events.len(), 1);
4525                 match events[0] {
4526                         Event::PaymentReceived { .. } => { },
4527                         _ => panic!("Unexpected event"),
4528                 };
4529
4530                 claim_payment(&nodes[1], &vec!(&nodes[0])[..], our_payment_preimage);
4531
4532                 send_payment(&nodes[1], &vec!(&nodes[0])[..], 800000);
4533                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 800000);
4534                 close_channel(&nodes[0], &nodes[1], &chan.2, chan.3, true);
4535         }
4536
4537         #[test]
4538         fn test_update_fee() {
4539                 let nodes = create_network(2);
4540                 let chan = create_announced_chan_between_nodes(&nodes, 0, 1);
4541                 let channel_id = chan.2;
4542
4543                 macro_rules! get_feerate {
4544                         ($node: expr) => {{
4545                                 let chan_lock = $node.node.channel_state.lock().unwrap();
4546                                 let chan = chan_lock.by_id.get(&channel_id).unwrap();
4547                                 chan.get_feerate()
4548                         }}
4549                 }
4550
4551                 // A                                        B
4552                 // (1) update_fee/commitment_signed      ->
4553                 //                                       <- (2) revoke_and_ack
4554                 //                                       .- send (3) commitment_signed
4555                 // (4) update_fee/commitment_signed      ->
4556                 //                                       .- send (5) revoke_and_ack (no CS as we're awaiting a revoke)
4557                 //                                       <- (3) commitment_signed delivered
4558                 // send (6) revoke_and_ack               -.
4559                 //                                       <- (5) deliver revoke_and_ack
4560                 // (6) deliver revoke_and_ack            ->
4561                 //                                       .- send (7) commitment_signed in response to (4)
4562                 //                                       <- (7) deliver commitment_signed
4563                 // revoke_and_ack                        ->
4564
4565                 // Create and deliver (1)...
4566                 let feerate = get_feerate!(nodes[0]);
4567                 nodes[0].node.update_fee(channel_id, feerate+20).unwrap();
4568                 check_added_monitors!(nodes[0], 1);
4569
4570                 let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
4571                 assert_eq!(events_0.len(), 1);
4572                 let (update_msg, commitment_signed) = match events_0[0] {
4573                                 MessageSendEvent::UpdateHTLCs { node_id:_, updates: msgs::CommitmentUpdate { update_add_htlcs:_, update_fulfill_htlcs:_, update_fail_htlcs:_, update_fail_malformed_htlcs:_, ref update_fee, ref commitment_signed } } => {
4574                                 (update_fee.as_ref(), commitment_signed)
4575                         },
4576                         _ => panic!("Unexpected event"),
4577                 };
4578                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap()).unwrap();
4579
4580                 // Generate (2) and (3):
4581                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed).unwrap();
4582                 let (revoke_msg, commitment_signed_0) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
4583                 check_added_monitors!(nodes[1], 1);
4584
4585                 // Deliver (2):
4586                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_msg).unwrap();
4587                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
4588                 check_added_monitors!(nodes[0], 1);
4589
4590                 // Create and deliver (4)...
4591                 nodes[0].node.update_fee(channel_id, feerate+30).unwrap();
4592                 check_added_monitors!(nodes[0], 1);
4593                 let events_0 = nodes[0].node.get_and_clear_pending_msg_events();
4594                 assert_eq!(events_0.len(), 1);
4595                 let (update_msg, commitment_signed) = match events_0[0] {
4596                                 MessageSendEvent::UpdateHTLCs { node_id:_, updates: msgs::CommitmentUpdate { update_add_htlcs:_, update_fulfill_htlcs:_, update_fail_htlcs:_, update_fail_malformed_htlcs:_, ref update_fee, ref commitment_signed } } => {
4597                                 (update_fee.as_ref(), commitment_signed)
4598                         },
4599                         _ => panic!("Unexpected event"),
4600                 };
4601
4602                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap()).unwrap();
4603                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed).unwrap();
4604                 check_added_monitors!(nodes[1], 1);
4605                 // ... creating (5)
4606                 let revoke_msg = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
4607                 // No commitment_signed so get_event_msg's assert(len == 1) passes
4608
4609                 // Handle (3), creating (6):
4610                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed_0).unwrap();
4611                 check_added_monitors!(nodes[0], 1);
4612                 let revoke_msg_0 = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
4613                 // No commitment_signed so get_event_msg's assert(len == 1) passes
4614
4615                 // Deliver (5):
4616                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_msg).unwrap();
4617                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
4618                 check_added_monitors!(nodes[0], 1);
4619
4620                 // Deliver (6), creating (7):
4621                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke_msg_0).unwrap();
4622                 let commitment_update = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
4623                 assert!(commitment_update.update_add_htlcs.is_empty());
4624                 assert!(commitment_update.update_fulfill_htlcs.is_empty());
4625                 assert!(commitment_update.update_fail_htlcs.is_empty());
4626                 assert!(commitment_update.update_fail_malformed_htlcs.is_empty());
4627                 assert!(commitment_update.update_fee.is_none());
4628                 check_added_monitors!(nodes[1], 1);
4629
4630                 // Deliver (7)
4631                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_update.commitment_signed).unwrap();
4632                 check_added_monitors!(nodes[0], 1);
4633                 let revoke_msg = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
4634                 // No commitment_signed so get_event_msg's assert(len == 1) passes
4635
4636                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke_msg).unwrap();
4637                 check_added_monitors!(nodes[1], 1);
4638                 assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
4639
4640                 assert_eq!(get_feerate!(nodes[0]), feerate + 30);
4641                 assert_eq!(get_feerate!(nodes[1]), feerate + 30);
4642                 close_channel(&nodes[0], &nodes[1], &chan.2, chan.3, true);
4643         }
4644
4645         #[test]
4646         fn fake_network_test() {
4647                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
4648                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
4649                 let nodes = create_network(4);
4650
4651                 // Create some initial channels
4652                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
4653                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
4654                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
4655
4656                 // Rebalance the network a bit by relaying one payment through all the channels...
4657                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
4658                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
4659                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
4660                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
4661
4662                 // Send some more payments
4663                 send_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 1000000);
4664                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1], &nodes[0])[..], 1000000);
4665                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1])[..], 1000000);
4666
4667                 // Test failure packets
4668                 let payment_hash_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 1000000).1;
4669                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], payment_hash_1);
4670
4671                 // Add a new channel that skips 3
4672                 let chan_4 = create_announced_chan_between_nodes(&nodes, 1, 3);
4673
4674                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 1000000);
4675                 send_payment(&nodes[2], &vec!(&nodes[3])[..], 1000000);
4676                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
4677                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
4678                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
4679                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
4680                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
4681
4682                 // Do some rebalance loop payments, simultaneously
4683                 let mut hops = Vec::with_capacity(3);
4684                 hops.push(RouteHop {
4685                         pubkey: nodes[2].node.get_our_node_id(),
4686                         short_channel_id: chan_2.0.contents.short_channel_id,
4687                         fee_msat: 0,
4688                         cltv_expiry_delta: chan_3.0.contents.cltv_expiry_delta as u32
4689                 });
4690                 hops.push(RouteHop {
4691                         pubkey: nodes[3].node.get_our_node_id(),
4692                         short_channel_id: chan_3.0.contents.short_channel_id,
4693                         fee_msat: 0,
4694                         cltv_expiry_delta: chan_4.1.contents.cltv_expiry_delta as u32
4695                 });
4696                 hops.push(RouteHop {
4697                         pubkey: nodes[1].node.get_our_node_id(),
4698                         short_channel_id: chan_4.0.contents.short_channel_id,
4699                         fee_msat: 1000000,
4700                         cltv_expiry_delta: TEST_FINAL_CLTV,
4701                 });
4702                 hops[1].fee_msat = chan_4.1.contents.fee_base_msat as u64 + chan_4.1.contents.fee_proportional_millionths as u64 * hops[2].fee_msat as u64 / 1000000;
4703                 hops[0].fee_msat = chan_3.0.contents.fee_base_msat as u64 + chan_3.0.contents.fee_proportional_millionths as u64 * hops[1].fee_msat as u64 / 1000000;
4704                 let payment_preimage_1 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[2], &nodes[3], &nodes[1])[..], 1000000).0;
4705
4706                 let mut hops = Vec::with_capacity(3);
4707                 hops.push(RouteHop {
4708                         pubkey: nodes[3].node.get_our_node_id(),
4709                         short_channel_id: chan_4.0.contents.short_channel_id,
4710                         fee_msat: 0,
4711                         cltv_expiry_delta: chan_3.1.contents.cltv_expiry_delta as u32
4712                 });
4713                 hops.push(RouteHop {
4714                         pubkey: nodes[2].node.get_our_node_id(),
4715                         short_channel_id: chan_3.0.contents.short_channel_id,
4716                         fee_msat: 0,
4717                         cltv_expiry_delta: chan_2.1.contents.cltv_expiry_delta as u32
4718                 });
4719                 hops.push(RouteHop {
4720                         pubkey: nodes[1].node.get_our_node_id(),
4721                         short_channel_id: chan_2.0.contents.short_channel_id,
4722                         fee_msat: 1000000,
4723                         cltv_expiry_delta: TEST_FINAL_CLTV,
4724                 });
4725                 hops[1].fee_msat = chan_2.1.contents.fee_base_msat as u64 + chan_2.1.contents.fee_proportional_millionths as u64 * hops[2].fee_msat as u64 / 1000000;
4726                 hops[0].fee_msat = chan_3.1.contents.fee_base_msat as u64 + chan_3.1.contents.fee_proportional_millionths as u64 * hops[1].fee_msat as u64 / 1000000;
4727                 let payment_hash_2 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[3], &nodes[2], &nodes[1])[..], 1000000).1;
4728
4729                 // Claim the rebalances...
4730                 fail_payment(&nodes[1], &vec!(&nodes[3], &nodes[2], &nodes[1])[..], payment_hash_2);
4731                 claim_payment(&nodes[1], &vec!(&nodes[2], &nodes[3], &nodes[1])[..], payment_preimage_1);
4732
4733                 // Add a duplicate new channel from 2 to 4
4734                 let chan_5 = create_announced_chan_between_nodes(&nodes, 1, 3);
4735
4736                 // Send some payments across both channels
4737                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
4738                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
4739                 let payment_preimage_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
4740
4741                 route_over_limit(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000);
4742
4743                 //TODO: Test that routes work again here as we've been notified that the channel is full
4744
4745                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_3);
4746                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_4);
4747                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_5);
4748
4749                 // Close down the channels...
4750                 close_channel(&nodes[0], &nodes[1], &chan_1.2, chan_1.3, true);
4751                 close_channel(&nodes[1], &nodes[2], &chan_2.2, chan_2.3, false);
4752                 close_channel(&nodes[2], &nodes[3], &chan_3.2, chan_3.3, true);
4753                 close_channel(&nodes[1], &nodes[3], &chan_4.2, chan_4.3, false);
4754                 close_channel(&nodes[1], &nodes[3], &chan_5.2, chan_5.3, false);
4755         }
4756
4757         #[test]
4758         fn duplicate_htlc_test() {
4759                 // Test that we accept duplicate payment_hash HTLCs across the network and that
4760                 // claiming/failing them are all separate and don't effect each other
4761                 let mut nodes = create_network(6);
4762
4763                 // Create some initial channels to route via 3 to 4/5 from 0/1/2
4764                 create_announced_chan_between_nodes(&nodes, 0, 3);
4765                 create_announced_chan_between_nodes(&nodes, 1, 3);
4766                 create_announced_chan_between_nodes(&nodes, 2, 3);
4767                 create_announced_chan_between_nodes(&nodes, 3, 4);
4768                 create_announced_chan_between_nodes(&nodes, 3, 5);
4769
4770                 let (payment_preimage, payment_hash) = route_payment(&nodes[0], &vec!(&nodes[3], &nodes[4])[..], 1000000);
4771
4772                 *nodes[0].network_payment_count.borrow_mut() -= 1;
4773                 assert_eq!(route_payment(&nodes[1], &vec!(&nodes[3])[..], 1000000).0, payment_preimage);
4774
4775                 *nodes[0].network_payment_count.borrow_mut() -= 1;
4776                 assert_eq!(route_payment(&nodes[2], &vec!(&nodes[3], &nodes[5])[..], 1000000).0, payment_preimage);
4777
4778                 claim_payment(&nodes[0], &vec!(&nodes[3], &nodes[4])[..], payment_preimage);
4779                 fail_payment(&nodes[2], &vec!(&nodes[3], &nodes[5])[..], payment_hash);
4780                 claim_payment(&nodes[1], &vec!(&nodes[3])[..], payment_preimage);
4781         }
4782
4783         #[derive(PartialEq)]
4784         enum HTLCType { NONE, TIMEOUT, SUCCESS }
4785         /// Tests that the given node has broadcast transactions for the given Channel
4786         ///
4787         /// First checks that the latest local commitment tx has been broadcast, unless an explicit
4788         /// commitment_tx is provided, which may be used to test that a remote commitment tx was
4789         /// broadcast and the revoked outputs were claimed.
4790         ///
4791         /// Next tests that there is (or is not) a transaction that spends the commitment transaction
4792         /// that appears to be the type of HTLC transaction specified in has_htlc_tx.
4793         ///
4794         /// All broadcast transactions must be accounted for in one of the above three types of we'll
4795         /// also fail.
4796         fn test_txn_broadcast(node: &Node, chan: &(msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction), commitment_tx: Option<Transaction>, has_htlc_tx: HTLCType) -> Vec<Transaction> {
4797                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
4798                 assert!(node_txn.len() >= if commitment_tx.is_some() { 0 } else { 1 } + if has_htlc_tx == HTLCType::NONE { 0 } else { 1 });
4799
4800                 let mut res = Vec::with_capacity(2);
4801                 node_txn.retain(|tx| {
4802                         if tx.input.len() == 1 && tx.input[0].previous_output.txid == chan.3.txid() {
4803                                 check_spends!(tx, chan.3.clone());
4804                                 if commitment_tx.is_none() {
4805                                         res.push(tx.clone());
4806                                 }
4807                                 false
4808                         } else { true }
4809                 });
4810                 if let Some(explicit_tx) = commitment_tx {
4811                         res.push(explicit_tx.clone());
4812                 }
4813
4814                 assert_eq!(res.len(), 1);
4815
4816                 if has_htlc_tx != HTLCType::NONE {
4817                         node_txn.retain(|tx| {
4818                                 if tx.input.len() == 1 && tx.input[0].previous_output.txid == res[0].txid() {
4819                                         check_spends!(tx, res[0].clone());
4820                                         if has_htlc_tx == HTLCType::TIMEOUT {
4821                                                 assert!(tx.lock_time != 0);
4822                                         } else {
4823                                                 assert!(tx.lock_time == 0);
4824                                         }
4825                                         res.push(tx.clone());
4826                                         false
4827                                 } else { true }
4828                         });
4829                         assert_eq!(res.len(), 2);
4830                 }
4831
4832                 assert!(node_txn.is_empty());
4833                 res
4834         }
4835
4836         /// Tests that the given node has broadcast a claim transaction against the provided revoked
4837         /// HTLC transaction.
4838         fn test_revoked_htlc_claim_txn_broadcast(node: &Node, revoked_tx: Transaction) {
4839                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
4840                 assert_eq!(node_txn.len(), 1);
4841                 node_txn.retain(|tx| {
4842                         if tx.input.len() == 1 && tx.input[0].previous_output.txid == revoked_tx.txid() {
4843                                 check_spends!(tx, revoked_tx.clone());
4844                                 false
4845                         } else { true }
4846                 });
4847                 assert!(node_txn.is_empty());
4848         }
4849
4850         fn check_preimage_claim(node: &Node, prev_txn: &Vec<Transaction>) -> Vec<Transaction> {
4851                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
4852
4853                 assert!(node_txn.len() >= 1);
4854                 assert_eq!(node_txn[0].input.len(), 1);
4855                 let mut found_prev = false;
4856
4857                 for tx in prev_txn {
4858                         if node_txn[0].input[0].previous_output.txid == tx.txid() {
4859                                 check_spends!(node_txn[0], tx.clone());
4860                                 assert!(node_txn[0].input[0].witness[2].len() > 106); // must spend an htlc output
4861                                 assert_eq!(tx.input.len(), 1); // must spend a commitment tx
4862
4863                                 found_prev = true;
4864                                 break;
4865                         }
4866                 }
4867                 assert!(found_prev);
4868
4869                 let mut res = Vec::new();
4870                 mem::swap(&mut *node_txn, &mut res);
4871                 res
4872         }
4873
4874         fn get_announce_close_broadcast_events(nodes: &Vec<Node>, a: usize, b: usize) {
4875                 let events_1 = nodes[a].node.get_and_clear_pending_msg_events();
4876                 assert_eq!(events_1.len(), 1);
4877                 let as_update = match events_1[0] {
4878                         MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
4879                                 msg.clone()
4880                         },
4881                         _ => panic!("Unexpected event"),
4882                 };
4883
4884                 let events_2 = nodes[b].node.get_and_clear_pending_msg_events();
4885                 assert_eq!(events_2.len(), 1);
4886                 let bs_update = match events_2[0] {
4887                         MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
4888                                 msg.clone()
4889                         },
4890                         _ => panic!("Unexpected event"),
4891                 };
4892
4893                 for node in nodes {
4894                         node.router.handle_channel_update(&as_update).unwrap();
4895                         node.router.handle_channel_update(&bs_update).unwrap();
4896                 }
4897         }
4898
4899         macro_rules! expect_pending_htlcs_forwardable {
4900                 ($node: expr) => {{
4901                         let events = $node.node.get_and_clear_pending_events();
4902                         assert_eq!(events.len(), 1);
4903                         match events[0] {
4904                                 Event::PendingHTLCsForwardable { .. } => { },
4905                                 _ => panic!("Unexpected event"),
4906                         };
4907                         $node.node.channel_state.lock().unwrap().next_forward = Instant::now();
4908                         $node.node.process_pending_htlc_forwards();
4909                 }}
4910         }
4911
4912         #[test]
4913         fn channel_reserve_test() {
4914                 use util::rng;
4915                 use std::sync::atomic::Ordering;
4916                 use ln::msgs::HandleError;
4917
4918                 macro_rules! get_channel_value_stat {
4919                         ($node: expr, $channel_id: expr) => {{
4920                                 let chan_lock = $node.node.channel_state.lock().unwrap();
4921                                 let chan = chan_lock.by_id.get(&$channel_id).unwrap();
4922                                 chan.get_value_stat()
4923                         }}
4924                 }
4925
4926                 let mut nodes = create_network(3);
4927                 let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1900, 1001);
4928                 let chan_2 = create_announced_chan_between_nodes_with_value(&nodes, 1, 2, 1900, 1001);
4929
4930                 let mut stat01 = get_channel_value_stat!(nodes[0], chan_1.2);
4931                 let mut stat11 = get_channel_value_stat!(nodes[1], chan_1.2);
4932
4933                 let mut stat12 = get_channel_value_stat!(nodes[1], chan_2.2);
4934                 let mut stat22 = get_channel_value_stat!(nodes[2], chan_2.2);
4935
4936                 macro_rules! get_route_and_payment_hash {
4937                         ($recv_value: expr) => {{
4938                                 let route = nodes[0].router.get_route(&nodes.last().unwrap().node.get_our_node_id(), None, &Vec::new(), $recv_value, TEST_FINAL_CLTV).unwrap();
4939                                 let (payment_preimage, payment_hash) = get_payment_preimage_hash!(nodes[0]);
4940                                 (route, payment_hash, payment_preimage)
4941                         }}
4942                 };
4943
4944                 macro_rules! expect_forward {
4945                         ($node: expr) => {{
4946                                 let mut events = $node.node.get_and_clear_pending_msg_events();
4947                                 assert_eq!(events.len(), 1);
4948                                 check_added_monitors!($node, 1);
4949                                 let payment_event = SendEvent::from_event(events.remove(0));
4950                                 payment_event
4951                         }}
4952                 }
4953
4954                 macro_rules! expect_payment_received {
4955                         ($node: expr, $expected_payment_hash: expr, $expected_recv_value: expr) => {
4956                                 let events = $node.node.get_and_clear_pending_events();
4957                                 assert_eq!(events.len(), 1);
4958                                 match events[0] {
4959                                         Event::PaymentReceived { ref payment_hash, amt } => {
4960                                                 assert_eq!($expected_payment_hash, *payment_hash);
4961                                                 assert_eq!($expected_recv_value, amt);
4962                                         },
4963                                         _ => panic!("Unexpected event"),
4964                                 }
4965                         }
4966                 };
4967
4968                 let feemsat = 239; // somehow we know?
4969                 let total_fee_msat = (nodes.len() - 2) as u64 * 239;
4970
4971                 let recv_value_0 = stat01.their_max_htlc_value_in_flight_msat - total_fee_msat;
4972
4973                 // attempt to send amt_msat > their_max_htlc_value_in_flight_msat
4974                 {
4975                         let (route, our_payment_hash, _) = get_route_and_payment_hash!(recv_value_0 + 1);
4976                         assert!(route.hops.iter().rev().skip(1).all(|h| h.fee_msat == feemsat));
4977                         let err = nodes[0].node.send_payment(route, our_payment_hash).err().unwrap();
4978                         match err {
4979                                 APIError::ChannelUnavailable{err} => assert_eq!(err, "Cannot send value that would put us over our max HTLC value in flight"),
4980                                 _ => panic!("Unknown error variants"),
4981                         }
4982                 }
4983
4984                 let mut htlc_id = 0;
4985                 // channel reserve is bigger than their_max_htlc_value_in_flight_msat so loop to deplete
4986                 // nodes[0]'s wealth
4987                 loop {
4988                         let amt_msat = recv_value_0 + total_fee_msat;
4989                         if stat01.value_to_self_msat - amt_msat < stat01.channel_reserve_msat {
4990                                 break;
4991                         }
4992                         send_payment(&nodes[0], &vec![&nodes[1], &nodes[2]][..], recv_value_0);
4993                         htlc_id += 1;
4994
4995                         let (stat01_, stat11_, stat12_, stat22_) = (
4996                                 get_channel_value_stat!(nodes[0], chan_1.2),
4997                                 get_channel_value_stat!(nodes[1], chan_1.2),
4998                                 get_channel_value_stat!(nodes[1], chan_2.2),
4999                                 get_channel_value_stat!(nodes[2], chan_2.2),
5000                         );
5001
5002                         assert_eq!(stat01_.value_to_self_msat, stat01.value_to_self_msat - amt_msat);
5003                         assert_eq!(stat11_.value_to_self_msat, stat11.value_to_self_msat + amt_msat);
5004                         assert_eq!(stat12_.value_to_self_msat, stat12.value_to_self_msat - (amt_msat - feemsat));
5005                         assert_eq!(stat22_.value_to_self_msat, stat22.value_to_self_msat + (amt_msat - feemsat));
5006                         stat01 = stat01_; stat11 = stat11_; stat12 = stat12_; stat22 = stat22_;
5007                 }
5008
5009                 {
5010                         let recv_value = stat01.value_to_self_msat - stat01.channel_reserve_msat - total_fee_msat;
5011                         // attempt to get channel_reserve violation
5012                         let (route, our_payment_hash, _) = get_route_and_payment_hash!(recv_value + 1);
5013                         let err = nodes[0].node.send_payment(route.clone(), our_payment_hash).err().unwrap();
5014                         match err {
5015                                 APIError::ChannelUnavailable{err} => assert_eq!(err, "Cannot send value that would put us over our reserve value"),
5016                                 _ => panic!("Unknown error variants"),
5017                         }
5018                 }
5019
5020                 // adding pending output
5021                 let recv_value_1 = (stat01.value_to_self_msat - stat01.channel_reserve_msat - total_fee_msat)/2;
5022                 let amt_msat_1 = recv_value_1 + total_fee_msat;
5023
5024                 let (route_1, our_payment_hash_1, our_payment_preimage_1) = get_route_and_payment_hash!(recv_value_1);
5025                 let payment_event_1 = {
5026                         nodes[0].node.send_payment(route_1, our_payment_hash_1).unwrap();
5027                         check_added_monitors!(nodes[0], 1);
5028
5029                         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
5030                         assert_eq!(events.len(), 1);
5031                         SendEvent::from_event(events.remove(0))
5032                 };
5033                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event_1.msgs[0]).unwrap();
5034
5035                 // channel reserve test with htlc pending output > 0
5036                 let recv_value_2 = stat01.value_to_self_msat - amt_msat_1 - stat01.channel_reserve_msat - total_fee_msat;
5037                 {
5038                         let (route, our_payment_hash, _) = get_route_and_payment_hash!(recv_value_2 + 1);
5039                         match nodes[0].node.send_payment(route, our_payment_hash).err().unwrap() {
5040                                 APIError::ChannelUnavailable{err} => assert_eq!(err, "Cannot send value that would put us over our reserve value"),
5041                                 _ => panic!("Unknown error variants"),
5042                         }
5043                 }
5044
5045                 {
5046                         // test channel_reserve test on nodes[1] side
5047                         let (route, our_payment_hash, _) = get_route_and_payment_hash!(recv_value_2 + 1);
5048
5049                         // Need to manually create update_add_htlc message to go around the channel reserve check in send_htlc()
5050                         let secp_ctx = Secp256k1::new();
5051                         let session_priv = SecretKey::from_slice(&secp_ctx, &{
5052                                 let mut session_key = [0; 32];
5053                                 rng::fill_bytes(&mut session_key);
5054                                 session_key
5055                         }).expect("RNG is bad!");
5056
5057                         let cur_height = nodes[0].node.latest_block_height.load(Ordering::Acquire) as u32 + 1;
5058                         let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
5059                         let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route, cur_height).unwrap();
5060                         let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, &our_payment_hash);
5061                         let msg = msgs::UpdateAddHTLC {
5062                                 channel_id: chan_1.2,
5063                                 htlc_id,
5064                                 amount_msat: htlc_msat,
5065                                 payment_hash: our_payment_hash,
5066                                 cltv_expiry: htlc_cltv,
5067                                 onion_routing_packet: onion_packet,
5068                         };
5069
5070                         let err = nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &msg).err().unwrap();
5071                         match err {
5072                                 HandleError{err, .. } => assert_eq!(err, "Remote HTLC add would put them over their reserve value"),
5073                         }
5074                 }
5075
5076                 // split the rest to test holding cell
5077                 let recv_value_21 = recv_value_2/2;
5078                 let recv_value_22 = recv_value_2 - recv_value_21 - total_fee_msat;
5079                 {
5080                         let stat = get_channel_value_stat!(nodes[0], chan_1.2);
5081                         assert_eq!(stat.value_to_self_msat - (stat.pending_outbound_htlcs_amount_msat + recv_value_21 + recv_value_22 + total_fee_msat + total_fee_msat), stat.channel_reserve_msat);
5082                 }
5083
5084                 // now see if they go through on both sides
5085                 let (route_21, our_payment_hash_21, our_payment_preimage_21) = get_route_and_payment_hash!(recv_value_21);
5086                 // but this will stuck in the holding cell
5087                 nodes[0].node.send_payment(route_21, our_payment_hash_21).unwrap();
5088                 check_added_monitors!(nodes[0], 0);
5089                 let events = nodes[0].node.get_and_clear_pending_events();
5090                 assert_eq!(events.len(), 0);
5091
5092                 // test with outbound holding cell amount > 0
5093                 {
5094                         let (route, our_payment_hash, _) = get_route_and_payment_hash!(recv_value_22+1);
5095                         match nodes[0].node.send_payment(route, our_payment_hash).err().unwrap() {
5096                                 APIError::ChannelUnavailable{err} => assert_eq!(err, "Cannot send value that would put us over our reserve value"),
5097                                 _ => panic!("Unknown error variants"),
5098                         }
5099                 }
5100
5101                 let (route_22, our_payment_hash_22, our_payment_preimage_22) = get_route_and_payment_hash!(recv_value_22);
5102                 // this will also stuck in the holding cell
5103                 nodes[0].node.send_payment(route_22, our_payment_hash_22).unwrap();
5104                 check_added_monitors!(nodes[0], 0);
5105                 assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
5106                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
5107
5108                 // flush the pending htlc
5109                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &payment_event_1.commitment_msg).unwrap();
5110                 let (as_revoke_and_ack, as_commitment_signed) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
5111                 check_added_monitors!(nodes[1], 1);
5112
5113                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &as_revoke_and_ack).unwrap();
5114                 check_added_monitors!(nodes[0], 1);
5115                 let commitment_update_2 = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
5116
5117                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &as_commitment_signed).unwrap();
5118                 let bs_revoke_and_ack = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
5119                 // No commitment_signed so get_event_msg's assert(len == 1) passes
5120                 check_added_monitors!(nodes[0], 1);
5121
5122                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &bs_revoke_and_ack).unwrap();
5123                 assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
5124                 check_added_monitors!(nodes[1], 1);
5125
5126                 expect_pending_htlcs_forwardable!(nodes[1]);
5127
5128                 let ref payment_event_11 = expect_forward!(nodes[1]);
5129                 nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event_11.msgs[0]).unwrap();
5130                 commitment_signed_dance!(nodes[2], nodes[1], payment_event_11.commitment_msg, false);
5131
5132                 expect_pending_htlcs_forwardable!(nodes[2]);
5133                 expect_payment_received!(nodes[2], our_payment_hash_1, recv_value_1);
5134
5135                 // flush the htlcs in the holding cell
5136                 assert_eq!(commitment_update_2.update_add_htlcs.len(), 2);
5137                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &commitment_update_2.update_add_htlcs[0]).unwrap();
5138                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &commitment_update_2.update_add_htlcs[1]).unwrap();
5139                 commitment_signed_dance!(nodes[1], nodes[0], &commitment_update_2.commitment_signed, false);
5140                 expect_pending_htlcs_forwardable!(nodes[1]);
5141
5142                 let ref payment_event_3 = expect_forward!(nodes[1]);
5143                 assert_eq!(payment_event_3.msgs.len(), 2);
5144                 nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event_3.msgs[0]).unwrap();
5145                 nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event_3.msgs[1]).unwrap();
5146
5147                 commitment_signed_dance!(nodes[2], nodes[1], &payment_event_3.commitment_msg, false);
5148                 expect_pending_htlcs_forwardable!(nodes[2]);
5149
5150                 let events = nodes[2].node.get_and_clear_pending_events();
5151                 assert_eq!(events.len(), 2);
5152                 match events[0] {
5153                         Event::PaymentReceived { ref payment_hash, amt } => {
5154                                 assert_eq!(our_payment_hash_21, *payment_hash);
5155                                 assert_eq!(recv_value_21, amt);
5156                         },
5157                         _ => panic!("Unexpected event"),
5158                 }
5159                 match events[1] {
5160                         Event::PaymentReceived { ref payment_hash, amt } => {
5161                                 assert_eq!(our_payment_hash_22, *payment_hash);
5162                                 assert_eq!(recv_value_22, amt);
5163                         },
5164                         _ => panic!("Unexpected event"),
5165                 }
5166
5167                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), our_payment_preimage_1);
5168                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), our_payment_preimage_21);
5169                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), our_payment_preimage_22);
5170
5171                 let expected_value_to_self = stat01.value_to_self_msat - (recv_value_1 + total_fee_msat) - (recv_value_21 + total_fee_msat) - (recv_value_22 + total_fee_msat);
5172                 let stat0 = get_channel_value_stat!(nodes[0], chan_1.2);
5173                 assert_eq!(stat0.value_to_self_msat, expected_value_to_self);
5174                 assert_eq!(stat0.value_to_self_msat, stat0.channel_reserve_msat);
5175
5176                 let stat2 = get_channel_value_stat!(nodes[2], chan_2.2);
5177                 assert_eq!(stat2.value_to_self_msat, stat22.value_to_self_msat + recv_value_1 + recv_value_21 + recv_value_22);
5178         }
5179
5180         #[test]
5181         fn channel_monitor_network_test() {
5182                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
5183                 // tests that ChannelMonitor is able to recover from various states.
5184                 let nodes = create_network(5);
5185
5186                 // Create some initial channels
5187                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
5188                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
5189                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
5190                 let chan_4 = create_announced_chan_between_nodes(&nodes, 3, 4);
5191
5192                 // Rebalance the network a bit by relaying one payment through all the channels...
5193                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
5194                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
5195                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
5196                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
5197
5198                 // Simple case with no pending HTLCs:
5199                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), true);
5200                 {
5201                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_1, None, HTLCType::NONE);
5202                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5203                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
5204                         test_txn_broadcast(&nodes[0], &chan_1, None, HTLCType::NONE);
5205                 }
5206                 get_announce_close_broadcast_events(&nodes, 0, 1);
5207                 assert_eq!(nodes[0].node.list_channels().len(), 0);
5208                 assert_eq!(nodes[1].node.list_channels().len(), 1);
5209
5210                 // One pending HTLC is discarded by the force-close:
5211                 let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 3000000).0;
5212
5213                 // Simple case of one pending HTLC to HTLC-Timeout
5214                 nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), true);
5215                 {
5216                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::TIMEOUT);
5217                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5218                         nodes[2].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
5219                         test_txn_broadcast(&nodes[2], &chan_2, None, HTLCType::NONE);
5220                 }
5221                 get_announce_close_broadcast_events(&nodes, 1, 2);
5222                 assert_eq!(nodes[1].node.list_channels().len(), 0);
5223                 assert_eq!(nodes[2].node.list_channels().len(), 1);
5224
5225                 macro_rules! claim_funds {
5226                         ($node: expr, $prev_node: expr, $preimage: expr) => {
5227                                 {
5228                                         assert!($node.node.claim_funds($preimage));
5229                                         check_added_monitors!($node, 1);
5230
5231                                         let events = $node.node.get_and_clear_pending_msg_events();
5232                                         assert_eq!(events.len(), 1);
5233                                         match events[0] {
5234                                                 MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fail_htlcs, .. } } => {
5235                                                         assert!(update_add_htlcs.is_empty());
5236                                                         assert!(update_fail_htlcs.is_empty());
5237                                                         assert_eq!(*node_id, $prev_node.node.get_our_node_id());
5238                                                 },
5239                                                 _ => panic!("Unexpected event"),
5240                                         };
5241                                 }
5242                         }
5243                 }
5244
5245                 // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
5246                 // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
5247                 nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
5248                 {
5249                         let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
5250
5251                         // Claim the payment on nodes[3], giving it knowledge of the preimage
5252                         claim_funds!(nodes[3], nodes[2], payment_preimage_1);
5253
5254                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5255                         nodes[3].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, 1);
5256
5257                         check_preimage_claim(&nodes[3], &node_txn);
5258                 }
5259                 get_announce_close_broadcast_events(&nodes, 2, 3);
5260                 assert_eq!(nodes[2].node.list_channels().len(), 0);
5261                 assert_eq!(nodes[3].node.list_channels().len(), 1);
5262
5263                 { // Cheat and reset nodes[4]'s height to 1
5264                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5265                         nodes[4].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![] }, 1);
5266                 }
5267
5268                 assert_eq!(nodes[3].node.latest_block_height.load(Ordering::Acquire), 1);
5269                 assert_eq!(nodes[4].node.latest_block_height.load(Ordering::Acquire), 1);
5270                 // One pending HTLC to time out:
5271                 let payment_preimage_2 = route_payment(&nodes[3], &vec!(&nodes[4])[..], 3000000).0;
5272                 // CLTV expires at TEST_FINAL_CLTV + 1 (current height) + 1 (added in send_payment for
5273                 // buffer space).
5274
5275                 {
5276                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5277                         nodes[3].chain_monitor.block_connected_checked(&header, 2, &Vec::new()[..], &[0; 0]);
5278                         for i in 3..TEST_FINAL_CLTV + 2 + HTLC_FAIL_TIMEOUT_BLOCKS + 1 {
5279                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5280                                 nodes[3].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
5281                         }
5282
5283                         let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
5284
5285                         // Claim the payment on nodes[4], giving it knowledge of the preimage
5286                         claim_funds!(nodes[4], nodes[3], payment_preimage_2);
5287
5288                         header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5289                         nodes[4].chain_monitor.block_connected_checked(&header, 2, &Vec::new()[..], &[0; 0]);
5290                         for i in 3..TEST_FINAL_CLTV + 2 - CLTV_CLAIM_BUFFER + 1 {
5291                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5292                                 nodes[4].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
5293                         }
5294
5295                         test_txn_broadcast(&nodes[4], &chan_4, None, HTLCType::SUCCESS);
5296
5297                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5298                         nodes[4].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, TEST_FINAL_CLTV - 5);
5299
5300                         check_preimage_claim(&nodes[4], &node_txn);
5301                 }
5302                 get_announce_close_broadcast_events(&nodes, 3, 4);
5303                 assert_eq!(nodes[3].node.list_channels().len(), 0);
5304                 assert_eq!(nodes[4].node.list_channels().len(), 0);
5305
5306                 // Create some new channels:
5307                 let chan_5 = create_announced_chan_between_nodes(&nodes, 0, 1);
5308
5309                 // A pending HTLC which will be revoked:
5310                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
5311                 // Get the will-be-revoked local txn from nodes[0]
5312                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.iter().next().unwrap().1.last_local_commitment_txn.clone();
5313                 assert_eq!(revoked_local_txn.len(), 2); // First commitment tx, then HTLC tx
5314                 assert_eq!(revoked_local_txn[0].input.len(), 1);
5315                 assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan_5.3.txid());
5316                 assert_eq!(revoked_local_txn[0].output.len(), 2); // Only HTLC and output back to 0 are present
5317                 assert_eq!(revoked_local_txn[1].input.len(), 1);
5318                 assert_eq!(revoked_local_txn[1].input[0].previous_output.txid, revoked_local_txn[0].txid());
5319                 assert_eq!(revoked_local_txn[1].input[0].witness.last().unwrap().len(), 133); // HTLC-Timeout
5320                 // Revoke the old state
5321                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
5322
5323                 {
5324                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5325                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
5326                         {
5327                                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
5328                                 assert_eq!(node_txn.len(), 3);
5329                                 assert_eq!(node_txn.pop().unwrap(), node_txn[0]); // An outpoint registration will result in a 2nd block_connected
5330                                 assert_eq!(node_txn[0].input.len(), 2); // We should claim the revoked output and the HTLC output
5331
5332                                 check_spends!(node_txn[0], revoked_local_txn[0].clone());
5333                                 node_txn.swap_remove(0);
5334                         }
5335                         test_txn_broadcast(&nodes[1], &chan_5, None, HTLCType::NONE);
5336
5337                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
5338                         let node_txn = test_txn_broadcast(&nodes[0], &chan_5, Some(revoked_local_txn[0].clone()), HTLCType::TIMEOUT);
5339                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5340                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[1].clone()] }, 1);
5341                         test_revoked_htlc_claim_txn_broadcast(&nodes[1], node_txn[1].clone());
5342                 }
5343                 get_announce_close_broadcast_events(&nodes, 0, 1);
5344                 assert_eq!(nodes[0].node.list_channels().len(), 0);
5345                 assert_eq!(nodes[1].node.list_channels().len(), 0);
5346         }
5347
5348         #[test]
5349         fn revoked_output_claim() {
5350                 // Simple test to ensure a node will claim a revoked output when a stale remote commitment
5351                 // transaction is broadcast by its counterparty
5352                 let nodes = create_network(2);
5353                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
5354                 // node[0] is gonna to revoke an old state thus node[1] should be able to claim the revoked output
5355                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan_1.2).unwrap().last_local_commitment_txn.clone();
5356                 assert_eq!(revoked_local_txn.len(), 1);
5357                 // Only output is the full channel value back to nodes[0]:
5358                 assert_eq!(revoked_local_txn[0].output.len(), 1);
5359                 // Send a payment through, updating everyone's latest commitment txn
5360                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 5000000);
5361
5362                 // Inform nodes[1] that nodes[0] broadcast a stale tx
5363                 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5364                 nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
5365                 let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
5366                 assert_eq!(node_txn.len(), 3); // nodes[1] will broadcast justice tx twice, and its own local state once
5367
5368                 assert_eq!(node_txn[0], node_txn[2]);
5369
5370                 check_spends!(node_txn[0], revoked_local_txn[0].clone());
5371                 check_spends!(node_txn[1], chan_1.3.clone());
5372
5373                 // Inform nodes[0] that a watchtower cheated on its behalf, so it will force-close the chan
5374                 nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
5375                 get_announce_close_broadcast_events(&nodes, 0, 1);
5376         }
5377
5378         #[test]
5379         fn claim_htlc_outputs_shared_tx() {
5380                 // Node revoked old state, htlcs haven't time out yet, claim them in shared justice tx
5381                 let nodes = create_network(2);
5382
5383                 // Create some new channel:
5384                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
5385
5386                 // Rebalance the network to generate htlc in the two directions
5387                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
5388                 // node[0] is gonna to revoke an old state thus node[1] should be able to claim both offered/received HTLC outputs on top of commitment tx
5389                 let payment_preimage_1 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
5390                 let _payment_preimage_2 = route_payment(&nodes[1], &vec!(&nodes[0])[..], 3000000).0;
5391
5392                 // Get the will-be-revoked local txn from node[0]
5393                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan_1.2).unwrap().last_local_commitment_txn.clone();
5394                 assert_eq!(revoked_local_txn.len(), 2); // commitment tx + 1 HTLC-Timeout tx
5395                 assert_eq!(revoked_local_txn[0].input.len(), 1);
5396                 assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan_1.3.txid());
5397                 assert_eq!(revoked_local_txn[1].input.len(), 1);
5398                 assert_eq!(revoked_local_txn[1].input[0].previous_output.txid, revoked_local_txn[0].txid());
5399                 assert_eq!(revoked_local_txn[1].input[0].witness.last().unwrap().len(), 133); // HTLC-Timeout
5400                 check_spends!(revoked_local_txn[1], revoked_local_txn[0].clone());
5401
5402                 //Revoke the old state
5403                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_1);
5404
5405                 {
5406                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5407
5408                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
5409
5410                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
5411                         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
5412                         assert_eq!(node_txn.len(), 4);
5413
5414                         assert_eq!(node_txn[0].input.len(), 3); // Claim the revoked output + both revoked HTLC outputs
5415                         check_spends!(node_txn[0], revoked_local_txn[0].clone());
5416
5417                         assert_eq!(node_txn[0], node_txn[3]); // justice tx is duplicated due to block re-scanning
5418
5419                         let mut witness_lens = BTreeSet::new();
5420                         witness_lens.insert(node_txn[0].input[0].witness.last().unwrap().len());
5421                         witness_lens.insert(node_txn[0].input[1].witness.last().unwrap().len());
5422                         witness_lens.insert(node_txn[0].input[2].witness.last().unwrap().len());
5423                         assert_eq!(witness_lens.len(), 3);
5424                         assert_eq!(*witness_lens.iter().skip(0).next().unwrap(), 77); // revoked to_local
5425                         assert_eq!(*witness_lens.iter().skip(1).next().unwrap(), 133); // revoked offered HTLC
5426                         assert_eq!(*witness_lens.iter().skip(2).next().unwrap(), 138); // revoked received HTLC
5427
5428                         // Next nodes[1] broadcasts its current local tx state:
5429                         assert_eq!(node_txn[1].input.len(), 1);
5430                         assert_eq!(node_txn[1].input[0].previous_output.txid, chan_1.3.txid()); //Spending funding tx unique txouput, tx broadcasted by ChannelManager
5431
5432                         assert_eq!(node_txn[2].input.len(), 1);
5433                         let witness_script = node_txn[2].clone().input[0].witness.pop().unwrap();
5434                         assert_eq!(witness_script.len(), 133); //Spending an offered htlc output
5435                         assert_eq!(node_txn[2].input[0].previous_output.txid, node_txn[1].txid());
5436                         assert_ne!(node_txn[2].input[0].previous_output.txid, node_txn[0].input[0].previous_output.txid);
5437                         assert_ne!(node_txn[2].input[0].previous_output.txid, node_txn[0].input[1].previous_output.txid);
5438                 }
5439                 get_announce_close_broadcast_events(&nodes, 0, 1);
5440                 assert_eq!(nodes[0].node.list_channels().len(), 0);
5441                 assert_eq!(nodes[1].node.list_channels().len(), 0);
5442         }
5443
5444         #[test]
5445         fn claim_htlc_outputs_single_tx() {
5446                 // Node revoked old state, htlcs have timed out, claim each of them in separated justice tx
5447                 let nodes = create_network(2);
5448
5449                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
5450
5451                 // Rebalance the network to generate htlc in the two directions
5452                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
5453                 // node[0] is gonna to revoke an old state thus node[1] should be able to claim both offered/received HTLC outputs on top of commitment tx, but this
5454                 // time as two different claim transactions as we're gonna to timeout htlc with given a high current height
5455                 let payment_preimage_1 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
5456                 let _payment_preimage_2 = route_payment(&nodes[1], &vec!(&nodes[0])[..], 3000000).0;
5457
5458                 // Get the will-be-revoked local txn from node[0]
5459                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan_1.2).unwrap().last_local_commitment_txn.clone();
5460
5461                 //Revoke the old state
5462                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_1);
5463
5464                 {
5465                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5466
5467                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 200);
5468
5469                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 200);
5470                         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
5471                         assert_eq!(node_txn.len(), 12); // ChannelManager : 2, ChannelMontitor: 8 (1 standard revoked output, 2 revocation htlc tx, 1 local commitment tx + 1 htlc timeout tx) * 2 (block-rescan)
5472
5473                         assert_eq!(node_txn[0], node_txn[7]);
5474                         assert_eq!(node_txn[1], node_txn[8]);
5475                         assert_eq!(node_txn[2], node_txn[9]);
5476                         assert_eq!(node_txn[3], node_txn[10]);
5477                         assert_eq!(node_txn[4], node_txn[11]);
5478                         assert_eq!(node_txn[3], node_txn[5]); //local commitment tx + htlc timeout tx broadcated by ChannelManger
5479                         assert_eq!(node_txn[4], node_txn[6]);
5480
5481                         assert_eq!(node_txn[0].input.len(), 1);
5482                         assert_eq!(node_txn[1].input.len(), 1);
5483                         assert_eq!(node_txn[2].input.len(), 1);
5484
5485                         let mut revoked_tx_map = HashMap::new();
5486                         revoked_tx_map.insert(revoked_local_txn[0].txid(), revoked_local_txn[0].clone());
5487                         node_txn[0].verify(&revoked_tx_map).unwrap();
5488                         node_txn[1].verify(&revoked_tx_map).unwrap();
5489                         node_txn[2].verify(&revoked_tx_map).unwrap();
5490
5491                         let mut witness_lens = BTreeSet::new();
5492                         witness_lens.insert(node_txn[0].input[0].witness.last().unwrap().len());
5493                         witness_lens.insert(node_txn[1].input[0].witness.last().unwrap().len());
5494                         witness_lens.insert(node_txn[2].input[0].witness.last().unwrap().len());
5495                         assert_eq!(witness_lens.len(), 3);
5496                         assert_eq!(*witness_lens.iter().skip(0).next().unwrap(), 77); // revoked to_local
5497                         assert_eq!(*witness_lens.iter().skip(1).next().unwrap(), 133); // revoked offered HTLC
5498                         assert_eq!(*witness_lens.iter().skip(2).next().unwrap(), 138); // revoked received HTLC
5499
5500                         assert_eq!(node_txn[3].input.len(), 1);
5501                         check_spends!(node_txn[3], chan_1.3.clone());
5502
5503                         assert_eq!(node_txn[4].input.len(), 1);
5504                         let witness_script = node_txn[4].input[0].witness.last().unwrap();
5505                         assert_eq!(witness_script.len(), 133); //Spending an offered htlc output
5506                         assert_eq!(node_txn[4].input[0].previous_output.txid, node_txn[3].txid());
5507                         assert_ne!(node_txn[4].input[0].previous_output.txid, node_txn[0].input[0].previous_output.txid);
5508                         assert_ne!(node_txn[4].input[0].previous_output.txid, node_txn[1].input[0].previous_output.txid);
5509                 }
5510                 get_announce_close_broadcast_events(&nodes, 0, 1);
5511                 assert_eq!(nodes[0].node.list_channels().len(), 0);
5512                 assert_eq!(nodes[1].node.list_channels().len(), 0);
5513         }
5514
5515         #[test]
5516         fn test_htlc_ignore_latest_remote_commitment() {
5517                 // Test that HTLC transactions spending the latest remote commitment transaction are simply
5518                 // ignored if we cannot claim them. This originally tickled an invalid unwrap().
5519                 let nodes = create_network(2);
5520                 create_announced_chan_between_nodes(&nodes, 0, 1);
5521
5522                 route_payment(&nodes[0], &[&nodes[1]], 10000000);
5523                 nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id);
5524                 {
5525                         let events = nodes[0].node.get_and_clear_pending_msg_events();
5526                         assert_eq!(events.len(), 1);
5527                         match events[0] {
5528                                 MessageSendEvent::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
5529                                         assert_eq!(flags & 0b10, 0b10);
5530                                 },
5531                                 _ => panic!("Unexpected event"),
5532                         }
5533                 }
5534
5535                 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
5536                 assert_eq!(node_txn.len(), 2);
5537
5538                 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5539                 nodes[1].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[0], &node_txn[1]], &[1; 2]);
5540
5541                 {
5542                         let events = nodes[1].node.get_and_clear_pending_msg_events();
5543                         assert_eq!(events.len(), 1);
5544                         match events[0] {
5545                                 MessageSendEvent::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
5546                                         assert_eq!(flags & 0b10, 0b10);
5547                                 },
5548                                 _ => panic!("Unexpected event"),
5549                         }
5550                 }
5551
5552                 // Duplicate the block_connected call since this may happen due to other listeners
5553                 // registering new transactions
5554                 nodes[1].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[0], &node_txn[1]], &[1; 2]);
5555         }
5556
5557         #[test]
5558         fn test_force_close_fail_back() {
5559                 // Check which HTLCs are failed-backwards on channel force-closure
5560                 let mut nodes = create_network(3);
5561                 create_announced_chan_between_nodes(&nodes, 0, 1);
5562                 create_announced_chan_between_nodes(&nodes, 1, 2);
5563
5564                 let route = nodes[0].router.get_route(&nodes[2].node.get_our_node_id(), None, &Vec::new(), 1000000, 42).unwrap();
5565
5566                 let (our_payment_preimage, our_payment_hash) = get_payment_preimage_hash!(nodes[0]);
5567
5568                 let mut payment_event = {
5569                         nodes[0].node.send_payment(route, our_payment_hash).unwrap();
5570                         check_added_monitors!(nodes[0], 1);
5571
5572                         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
5573                         assert_eq!(events.len(), 1);
5574                         SendEvent::from_event(events.remove(0))
5575                 };
5576
5577                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
5578                 commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
5579
5580                 let events_1 = nodes[1].node.get_and_clear_pending_events();
5581                 assert_eq!(events_1.len(), 1);
5582                 match events_1[0] {
5583                         Event::PendingHTLCsForwardable { .. } => { },
5584                         _ => panic!("Unexpected event"),
5585                 };
5586
5587                 nodes[1].node.channel_state.lock().unwrap().next_forward = Instant::now();
5588                 nodes[1].node.process_pending_htlc_forwards();
5589
5590                 let mut events_2 = nodes[1].node.get_and_clear_pending_msg_events();
5591                 assert_eq!(events_2.len(), 1);
5592                 payment_event = SendEvent::from_event(events_2.remove(0));
5593                 assert_eq!(payment_event.msgs.len(), 1);
5594
5595                 check_added_monitors!(nodes[1], 1);
5596                 nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
5597                 nodes[2].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
5598                 check_added_monitors!(nodes[2], 1);
5599                 let (_, _) = get_revoke_commit_msgs!(nodes[2], nodes[1].node.get_our_node_id());
5600
5601                 // nodes[2] now has the latest commitment transaction, but hasn't revoked its previous
5602                 // state or updated nodes[1]' state. Now force-close and broadcast that commitment/HTLC
5603                 // transaction and ensure nodes[1] doesn't fail-backwards (this was originally a bug!).
5604
5605                 nodes[2].node.force_close_channel(&payment_event.commitment_msg.channel_id);
5606                 let events_3 = nodes[2].node.get_and_clear_pending_msg_events();
5607                 assert_eq!(events_3.len(), 1);
5608                 match events_3[0] {
5609                         MessageSendEvent::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
5610                                 assert_eq!(flags & 0b10, 0b10);
5611                         },
5612                         _ => panic!("Unexpected event"),
5613                 }
5614
5615                 let tx = {
5616                         let mut node_txn = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap();
5617                         // Note that we don't bother broadcasting the HTLC-Success transaction here as we don't
5618                         // have a use for it unless nodes[2] learns the preimage somehow, the funds will go
5619                         // back to nodes[1] upon timeout otherwise.
5620                         assert_eq!(node_txn.len(), 1);
5621                         node_txn.remove(0)
5622                 };
5623
5624                 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5625                 nodes[1].chain_monitor.block_connected_checked(&header, 1, &[&tx], &[1]);
5626
5627                 let events_4 = nodes[1].node.get_and_clear_pending_msg_events();
5628                 // Note no UpdateHTLCs event here from nodes[1] to nodes[0]!
5629                 assert_eq!(events_4.len(), 1);
5630                 match events_4[0] {
5631                         MessageSendEvent::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
5632                                 assert_eq!(flags & 0b10, 0b10);
5633                         },
5634                         _ => panic!("Unexpected event"),
5635                 }
5636
5637                 // Now check that if we add the preimage to ChannelMonitor it broadcasts our HTLC-Success..
5638                 {
5639                         let mut monitors = nodes[2].chan_monitor.simple_monitor.monitors.lock().unwrap();
5640                         monitors.get_mut(&OutPoint::new(Sha256dHash::from(&payment_event.commitment_msg.channel_id[..]), 0)).unwrap()
5641                                 .provide_payment_preimage(&our_payment_hash, &our_payment_preimage);
5642                 }
5643                 nodes[2].chain_monitor.block_connected_checked(&header, 1, &[&tx], &[1]);
5644                 let node_txn = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap();
5645                 assert_eq!(node_txn.len(), 1);
5646                 assert_eq!(node_txn[0].input.len(), 1);
5647                 assert_eq!(node_txn[0].input[0].previous_output.txid, tx.txid());
5648                 assert_eq!(node_txn[0].lock_time, 0); // Must be an HTLC-Success
5649                 assert_eq!(node_txn[0].input[0].witness.len(), 5); // Must be an HTLC-Success
5650
5651                 check_spends!(node_txn[0], tx);
5652         }
5653
5654         #[test]
5655         fn test_unconf_chan() {
5656                 // After creating a chan between nodes, we disconnect all blocks previously seen to force a channel close on nodes[0] side
5657                 let nodes = create_network(2);
5658                 create_announced_chan_between_nodes(&nodes, 0, 1);
5659
5660                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
5661                 assert_eq!(channel_state.by_id.len(), 1);
5662                 assert_eq!(channel_state.short_to_id.len(), 1);
5663                 mem::drop(channel_state);
5664
5665                 let mut headers = Vec::new();
5666                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5667                 headers.push(header.clone());
5668                 for _i in 2..100 {
5669                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
5670                         headers.push(header.clone());
5671                 }
5672                 while !headers.is_empty() {
5673                         nodes[0].node.block_disconnected(&headers.pop().unwrap());
5674                 }
5675                 {
5676                         let events = nodes[0].node.get_and_clear_pending_msg_events();
5677                         assert_eq!(events.len(), 1);
5678                         match events[0] {
5679                                 MessageSendEvent::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
5680                                         assert_eq!(flags & 0b10, 0b10);
5681                                 },
5682                                 _ => panic!("Unexpected event"),
5683                         }
5684                 }
5685                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
5686                 assert_eq!(channel_state.by_id.len(), 0);
5687                 assert_eq!(channel_state.short_to_id.len(), 0);
5688         }
5689
5690         macro_rules! get_chan_reestablish_msgs {
5691                 ($src_node: expr, $dst_node: expr) => {
5692                         {
5693                                 let mut res = Vec::with_capacity(1);
5694                                 for msg in $src_node.node.get_and_clear_pending_msg_events() {
5695                                         if let MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } = msg {
5696                                                 assert_eq!(*node_id, $dst_node.node.get_our_node_id());
5697                                                 res.push(msg.clone());
5698                                         } else {
5699                                                 panic!("Unexpected event")
5700                                         }
5701                                 }
5702                                 res
5703                         }
5704                 }
5705         }
5706
5707         macro_rules! handle_chan_reestablish_msgs {
5708                 ($src_node: expr, $dst_node: expr) => {
5709                         {
5710                                 let msg_events = $src_node.node.get_and_clear_pending_msg_events();
5711                                 let mut idx = 0;
5712                                 let funding_locked = if let Some(&MessageSendEvent::SendFundingLocked { ref node_id, ref msg }) = msg_events.get(0) {
5713                                         idx += 1;
5714                                         assert_eq!(*node_id, $dst_node.node.get_our_node_id());
5715                                         Some(msg.clone())
5716                                 } else {
5717                                         None
5718                                 };
5719
5720                                 let mut revoke_and_ack = None;
5721                                 let mut commitment_update = None;
5722                                 let order = if let Some(ev) = msg_events.get(idx) {
5723                                         idx += 1;
5724                                         match ev {
5725                                                 &MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
5726                                                         assert_eq!(*node_id, $dst_node.node.get_our_node_id());
5727                                                         revoke_and_ack = Some(msg.clone());
5728                                                         RAACommitmentOrder::RevokeAndACKFirst
5729                                                 },
5730                                                 &MessageSendEvent::UpdateHTLCs { ref node_id, ref updates } => {
5731                                                         assert_eq!(*node_id, $dst_node.node.get_our_node_id());
5732                                                         commitment_update = Some(updates.clone());
5733                                                         RAACommitmentOrder::CommitmentFirst
5734                                                 },
5735                                                 _ => panic!("Unexpected event"),
5736                                         }
5737                                 } else {
5738                                         RAACommitmentOrder::CommitmentFirst
5739                                 };
5740
5741                                 if let Some(ev) = msg_events.get(idx) {
5742                                         match ev {
5743                                                 &MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
5744                                                         assert_eq!(*node_id, $dst_node.node.get_our_node_id());
5745                                                         assert!(revoke_and_ack.is_none());
5746                                                         revoke_and_ack = Some(msg.clone());
5747                                                 },
5748                                                 &MessageSendEvent::UpdateHTLCs { ref node_id, ref updates } => {
5749                                                         assert_eq!(*node_id, $dst_node.node.get_our_node_id());
5750                                                         assert!(commitment_update.is_none());
5751                                                         commitment_update = Some(updates.clone());
5752                                                 },
5753                                                 _ => panic!("Unexpected event"),
5754                                         }
5755                                 }
5756
5757                                 (funding_locked, revoke_and_ack, commitment_update, order)
5758                         }
5759                 }
5760         }
5761
5762         /// pending_htlc_adds includes both the holding cell and in-flight update_add_htlcs, whereas
5763         /// for claims/fails they are separated out.
5764         fn reconnect_nodes(node_a: &Node, node_b: &Node, pre_all_htlcs: bool, pending_htlc_adds: (i64, i64), pending_htlc_claims: (usize, usize), pending_cell_htlc_claims: (usize, usize), pending_cell_htlc_fails: (usize, usize), pending_raa: (bool, bool)) {
5765                 node_a.node.peer_connected(&node_b.node.get_our_node_id());
5766                 let reestablish_1 = get_chan_reestablish_msgs!(node_a, node_b);
5767                 node_b.node.peer_connected(&node_a.node.get_our_node_id());
5768                 let reestablish_2 = get_chan_reestablish_msgs!(node_b, node_a);
5769
5770                 let mut resp_1 = Vec::new();
5771                 for msg in reestablish_1 {
5772                         node_b.node.handle_channel_reestablish(&node_a.node.get_our_node_id(), &msg).unwrap();
5773                         resp_1.push(handle_chan_reestablish_msgs!(node_b, node_a));
5774                 }
5775                 if pending_cell_htlc_claims.0 != 0 || pending_cell_htlc_fails.0 != 0 {
5776                         check_added_monitors!(node_b, 1);
5777                 } else {
5778                         check_added_monitors!(node_b, 0);
5779                 }
5780
5781                 let mut resp_2 = Vec::new();
5782                 for msg in reestablish_2 {
5783                         node_a.node.handle_channel_reestablish(&node_b.node.get_our_node_id(), &msg).unwrap();
5784                         resp_2.push(handle_chan_reestablish_msgs!(node_a, node_b));
5785                 }
5786                 if pending_cell_htlc_claims.1 != 0 || pending_cell_htlc_fails.1 != 0 {
5787                         check_added_monitors!(node_a, 1);
5788                 } else {
5789                         check_added_monitors!(node_a, 0);
5790                 }
5791
5792                 // We dont yet support both needing updates, as that would require a different commitment dance:
5793                 assert!((pending_htlc_adds.0 == 0 && pending_htlc_claims.0 == 0 && pending_cell_htlc_claims.0 == 0 && pending_cell_htlc_fails.0 == 0) ||
5794                         (pending_htlc_adds.1 == 0 && pending_htlc_claims.1 == 0 && pending_cell_htlc_claims.1 == 0 && pending_cell_htlc_fails.1 == 0));
5795
5796                 for chan_msgs in resp_1.drain(..) {
5797                         if pre_all_htlcs {
5798                                 node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), &chan_msgs.0.unwrap()).unwrap();
5799                                 let announcement_event = node_a.node.get_and_clear_pending_msg_events();
5800                                 if !announcement_event.is_empty() {
5801                                         assert_eq!(announcement_event.len(), 1);
5802                                         if let MessageSendEvent::SendAnnouncementSignatures { .. } = announcement_event[0] {
5803                                                 //TODO: Test announcement_sigs re-sending
5804                                         } else { panic!("Unexpected event!"); }
5805                                 }
5806                         } else {
5807                                 assert!(chan_msgs.0.is_none());
5808                         }
5809                         if pending_raa.0 {
5810                                 assert!(chan_msgs.3 == RAACommitmentOrder::RevokeAndACKFirst);
5811                                 node_a.node.handle_revoke_and_ack(&node_b.node.get_our_node_id(), &chan_msgs.1.unwrap()).unwrap();
5812                                 assert!(node_a.node.get_and_clear_pending_msg_events().is_empty());
5813                                 check_added_monitors!(node_a, 1);
5814                         } else {
5815                                 assert!(chan_msgs.1.is_none());
5816                         }
5817                         if pending_htlc_adds.0 != 0 || pending_htlc_claims.0 != 0 || pending_cell_htlc_claims.0 != 0 || pending_cell_htlc_fails.0 != 0 {
5818                                 let commitment_update = chan_msgs.2.unwrap();
5819                                 if pending_htlc_adds.0 != -1 { // We use -1 to denote a response commitment_signed
5820                                         assert_eq!(commitment_update.update_add_htlcs.len(), pending_htlc_adds.0 as usize);
5821                                 } else {
5822                                         assert!(commitment_update.update_add_htlcs.is_empty());
5823                                 }
5824                                 assert_eq!(commitment_update.update_fulfill_htlcs.len(), pending_htlc_claims.0 + pending_cell_htlc_claims.0);
5825                                 assert_eq!(commitment_update.update_fail_htlcs.len(), pending_cell_htlc_fails.0);
5826                                 assert!(commitment_update.update_fail_malformed_htlcs.is_empty());
5827                                 for update_add in commitment_update.update_add_htlcs {
5828                                         node_a.node.handle_update_add_htlc(&node_b.node.get_our_node_id(), &update_add).unwrap();
5829                                 }
5830                                 for update_fulfill in commitment_update.update_fulfill_htlcs {
5831                                         node_a.node.handle_update_fulfill_htlc(&node_b.node.get_our_node_id(), &update_fulfill).unwrap();
5832                                 }
5833                                 for update_fail in commitment_update.update_fail_htlcs {
5834                                         node_a.node.handle_update_fail_htlc(&node_b.node.get_our_node_id(), &update_fail).unwrap();
5835                                 }
5836
5837                                 if pending_htlc_adds.0 != -1 { // We use -1 to denote a response commitment_signed
5838                                         commitment_signed_dance!(node_a, node_b, commitment_update.commitment_signed, false);
5839                                 } else {
5840                                         node_a.node.handle_commitment_signed(&node_b.node.get_our_node_id(), &commitment_update.commitment_signed).unwrap();
5841                                         check_added_monitors!(node_a, 1);
5842                                         let as_revoke_and_ack = get_event_msg!(node_a, MessageSendEvent::SendRevokeAndACK, node_b.node.get_our_node_id());
5843                                         // No commitment_signed so get_event_msg's assert(len == 1) passes
5844                                         node_b.node.handle_revoke_and_ack(&node_a.node.get_our_node_id(), &as_revoke_and_ack).unwrap();
5845                                         assert!(node_b.node.get_and_clear_pending_msg_events().is_empty());
5846                                         check_added_monitors!(node_b, 1);
5847                                 }
5848                         } else {
5849                                 assert!(chan_msgs.2.is_none());
5850                         }
5851                 }
5852
5853                 for chan_msgs in resp_2.drain(..) {
5854                         if pre_all_htlcs {
5855                                 node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), &chan_msgs.0.unwrap()).unwrap();
5856                                 let announcement_event = node_b.node.get_and_clear_pending_msg_events();
5857                                 if !announcement_event.is_empty() {
5858                                         assert_eq!(announcement_event.len(), 1);
5859                                         if let MessageSendEvent::SendAnnouncementSignatures { .. } = announcement_event[0] {
5860                                                 //TODO: Test announcement_sigs re-sending
5861                                         } else { panic!("Unexpected event!"); }
5862                                 }
5863                         } else {
5864                                 assert!(chan_msgs.0.is_none());
5865                         }
5866                         if pending_raa.1 {
5867                                 assert!(chan_msgs.3 == RAACommitmentOrder::RevokeAndACKFirst);
5868                                 node_b.node.handle_revoke_and_ack(&node_a.node.get_our_node_id(), &chan_msgs.1.unwrap()).unwrap();
5869                                 assert!(node_b.node.get_and_clear_pending_msg_events().is_empty());
5870                                 check_added_monitors!(node_b, 1);
5871                         } else {
5872                                 assert!(chan_msgs.1.is_none());
5873                         }
5874                         if pending_htlc_adds.1 != 0 || pending_htlc_claims.1 != 0 || pending_cell_htlc_claims.1 != 0 || pending_cell_htlc_fails.1 != 0 {
5875                                 let commitment_update = chan_msgs.2.unwrap();
5876                                 if pending_htlc_adds.1 != -1 { // We use -1 to denote a response commitment_signed
5877                                         assert_eq!(commitment_update.update_add_htlcs.len(), pending_htlc_adds.1 as usize);
5878                                 }
5879                                 assert_eq!(commitment_update.update_fulfill_htlcs.len(), pending_htlc_claims.0 + pending_cell_htlc_claims.0);
5880                                 assert_eq!(commitment_update.update_fail_htlcs.len(), pending_cell_htlc_fails.0);
5881                                 assert!(commitment_update.update_fail_malformed_htlcs.is_empty());
5882                                 for update_add in commitment_update.update_add_htlcs {
5883                                         node_b.node.handle_update_add_htlc(&node_a.node.get_our_node_id(), &update_add).unwrap();
5884                                 }
5885                                 for update_fulfill in commitment_update.update_fulfill_htlcs {
5886                                         node_b.node.handle_update_fulfill_htlc(&node_a.node.get_our_node_id(), &update_fulfill).unwrap();
5887                                 }
5888                                 for update_fail in commitment_update.update_fail_htlcs {
5889                                         node_b.node.handle_update_fail_htlc(&node_a.node.get_our_node_id(), &update_fail).unwrap();
5890                                 }
5891
5892                                 if pending_htlc_adds.1 != -1 { // We use -1 to denote a response commitment_signed
5893                                         commitment_signed_dance!(node_b, node_a, commitment_update.commitment_signed, false);
5894                                 } else {
5895                                         node_b.node.handle_commitment_signed(&node_a.node.get_our_node_id(), &commitment_update.commitment_signed).unwrap();
5896                                         check_added_monitors!(node_b, 1);
5897                                         let bs_revoke_and_ack = get_event_msg!(node_b, MessageSendEvent::SendRevokeAndACK, node_a.node.get_our_node_id());
5898                                         // No commitment_signed so get_event_msg's assert(len == 1) passes
5899                                         node_a.node.handle_revoke_and_ack(&node_b.node.get_our_node_id(), &bs_revoke_and_ack).unwrap();
5900                                         assert!(node_a.node.get_and_clear_pending_msg_events().is_empty());
5901                                         check_added_monitors!(node_a, 1);
5902                                 }
5903                         } else {
5904                                 assert!(chan_msgs.2.is_none());
5905                         }
5906                 }
5907         }
5908
5909         #[test]
5910         fn test_simple_peer_disconnect() {
5911                 // Test that we can reconnect when there are no lost messages
5912                 let nodes = create_network(3);
5913                 create_announced_chan_between_nodes(&nodes, 0, 1);
5914                 create_announced_chan_between_nodes(&nodes, 1, 2);
5915
5916                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
5917                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
5918                 reconnect_nodes(&nodes[0], &nodes[1], true, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
5919
5920                 let payment_preimage_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).0;
5921                 let payment_hash_2 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).1;
5922                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_hash_2);
5923                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_preimage_1);
5924
5925                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
5926                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
5927                 reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
5928
5929                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).0;
5930                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).0;
5931                 let payment_hash_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).1;
5932                 let payment_hash_6 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).1;
5933
5934                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
5935                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
5936
5937                 claim_payment_along_route(&nodes[0], &vec!(&nodes[1], &nodes[2]), true, payment_preimage_3);
5938                 fail_payment_along_route(&nodes[0], &[&nodes[1], &nodes[2]], true, payment_hash_5);
5939
5940                 reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (1, 0), (1, 0), (false, false));
5941                 {
5942                         let events = nodes[0].node.get_and_clear_pending_events();
5943                         assert_eq!(events.len(), 2);
5944                         match events[0] {
5945                                 Event::PaymentSent { payment_preimage } => {
5946                                         assert_eq!(payment_preimage, payment_preimage_3);
5947                                 },
5948                                 _ => panic!("Unexpected event"),
5949                         }
5950                         match events[1] {
5951                                 Event::PaymentFailed { payment_hash, rejected_by_dest } => {
5952                                         assert_eq!(payment_hash, payment_hash_5);
5953                                         assert!(rejected_by_dest);
5954                                 },
5955                                 _ => panic!("Unexpected event"),
5956                         }
5957                 }
5958
5959                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_preimage_4);
5960                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_hash_6);
5961         }
5962
5963         fn do_test_drop_messages_peer_disconnect(messages_delivered: u8) {
5964                 // Test that we can reconnect when in-flight HTLC updates get dropped
5965                 let mut nodes = create_network(2);
5966                 if messages_delivered == 0 {
5967                         create_chan_between_nodes_with_value_a(&nodes[0], &nodes[1], 100000, 10001);
5968                         // nodes[1] doesn't receive the funding_locked message (it'll be re-sent on reconnect)
5969                 } else {
5970                         create_announced_chan_between_nodes(&nodes, 0, 1);
5971                 }
5972
5973                 let route = nodes[0].router.get_route(&nodes[1].node.get_our_node_id(), Some(&nodes[0].node.list_usable_channels()), &Vec::new(), 1000000, TEST_FINAL_CLTV).unwrap();
5974                 let (payment_preimage_1, payment_hash_1) = get_payment_preimage_hash!(nodes[0]);
5975
5976                 let payment_event = {
5977                         nodes[0].node.send_payment(route.clone(), payment_hash_1).unwrap();
5978                         check_added_monitors!(nodes[0], 1);
5979
5980                         let mut events = nodes[0].node.get_and_clear_pending_msg_events();
5981                         assert_eq!(events.len(), 1);
5982                         SendEvent::from_event(events.remove(0))
5983                 };
5984                 assert_eq!(nodes[1].node.get_our_node_id(), payment_event.node_id);
5985
5986                 if messages_delivered < 2 {
5987                         // Drop the payment_event messages, and let them get re-generated in reconnect_nodes!
5988                 } else {
5989                         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
5990                         if messages_delivered >= 3 {
5991                                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
5992                                 check_added_monitors!(nodes[1], 1);
5993                                 let (bs_revoke_and_ack, bs_commitment_signed) = get_revoke_commit_msgs!(nodes[1], nodes[0].node.get_our_node_id());
5994
5995                                 if messages_delivered >= 4 {
5996                                         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_and_ack).unwrap();
5997                                         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
5998                                         check_added_monitors!(nodes[0], 1);
5999
6000                                         if messages_delivered >= 5 {
6001                                                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_commitment_signed).unwrap();
6002                                                 let as_revoke_and_ack = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
6003                                                 // No commitment_signed so get_event_msg's assert(len == 1) passes
6004                                                 check_added_monitors!(nodes[0], 1);
6005
6006                                                 if messages_delivered >= 6 {
6007                                                         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_and_ack).unwrap();
6008                                                         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
6009                                                         check_added_monitors!(nodes[1], 1);
6010                                                 }
6011                                         }
6012                                 }
6013                         }
6014                 }
6015
6016                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
6017                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6018                 if messages_delivered < 3 {
6019                         // Even if the funding_locked messages get exchanged, as long as nothing further was
6020                         // received on either side, both sides will need to resend them.
6021                         reconnect_nodes(&nodes[0], &nodes[1], true, (0, 1), (0, 0), (0, 0), (0, 0), (false, false));
6022                 } else if messages_delivered == 3 {
6023                         // nodes[0] still wants its RAA + commitment_signed
6024                         reconnect_nodes(&nodes[0], &nodes[1], false, (-1, 0), (0, 0), (0, 0), (0, 0), (true, false));
6025                 } else if messages_delivered == 4 {
6026                         // nodes[0] still wants its commitment_signed
6027                         reconnect_nodes(&nodes[0], &nodes[1], false, (-1, 0), (0, 0), (0, 0), (0, 0), (false, false));
6028                 } else if messages_delivered == 5 {
6029                         // nodes[1] still wants its final RAA
6030                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, true));
6031                 } else if messages_delivered == 6 {
6032                         // Everything was delivered...
6033                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
6034                 }
6035
6036                 let events_1 = nodes[1].node.get_and_clear_pending_events();
6037                 assert_eq!(events_1.len(), 1);
6038                 match events_1[0] {
6039                         Event::PendingHTLCsForwardable { .. } => { },
6040                         _ => panic!("Unexpected event"),
6041                 };
6042
6043                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
6044                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6045                 reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
6046
6047                 nodes[1].node.channel_state.lock().unwrap().next_forward = Instant::now();
6048                 nodes[1].node.process_pending_htlc_forwards();
6049
6050                 let events_2 = nodes[1].node.get_and_clear_pending_events();
6051                 assert_eq!(events_2.len(), 1);
6052                 match events_2[0] {
6053                         Event::PaymentReceived { ref payment_hash, amt } => {
6054                                 assert_eq!(payment_hash_1, *payment_hash);
6055                                 assert_eq!(amt, 1000000);
6056                         },
6057                         _ => panic!("Unexpected event"),
6058                 }
6059
6060                 nodes[1].node.claim_funds(payment_preimage_1);
6061                 check_added_monitors!(nodes[1], 1);
6062
6063                 let events_3 = nodes[1].node.get_and_clear_pending_msg_events();
6064                 assert_eq!(events_3.len(), 1);
6065                 let (update_fulfill_htlc, commitment_signed) = match events_3[0] {
6066                         MessageSendEvent::UpdateHTLCs { ref node_id, ref updates } => {
6067                                 assert_eq!(*node_id, nodes[0].node.get_our_node_id());
6068                                 assert!(updates.update_add_htlcs.is_empty());
6069                                 assert!(updates.update_fail_htlcs.is_empty());
6070                                 assert_eq!(updates.update_fulfill_htlcs.len(), 1);
6071                                 assert!(updates.update_fail_malformed_htlcs.is_empty());
6072                                 assert!(updates.update_fee.is_none());
6073                                 (updates.update_fulfill_htlcs[0].clone(), updates.commitment_signed.clone())
6074                         },
6075                         _ => panic!("Unexpected event"),
6076                 };
6077
6078                 if messages_delivered >= 1 {
6079                         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &update_fulfill_htlc).unwrap();
6080
6081                         let events_4 = nodes[0].node.get_and_clear_pending_events();
6082                         assert_eq!(events_4.len(), 1);
6083                         match events_4[0] {
6084                                 Event::PaymentSent { ref payment_preimage } => {
6085                                         assert_eq!(payment_preimage_1, *payment_preimage);
6086                                 },
6087                                 _ => panic!("Unexpected event"),
6088                         }
6089
6090                         if messages_delivered >= 2 {
6091                                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed).unwrap();
6092                                 check_added_monitors!(nodes[0], 1);
6093                                 let (as_revoke_and_ack, as_commitment_signed) = get_revoke_commit_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6094
6095                                 if messages_delivered >= 3 {
6096                                         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_and_ack).unwrap();
6097                                         assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
6098                                         check_added_monitors!(nodes[1], 1);
6099
6100                                         if messages_delivered >= 4 {
6101                                                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_commitment_signed).unwrap();
6102                                                 let bs_revoke_and_ack = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
6103                                                 // No commitment_signed so get_event_msg's assert(len == 1) passes
6104                                                 check_added_monitors!(nodes[1], 1);
6105
6106                                                 if messages_delivered >= 5 {
6107                                                         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_and_ack).unwrap();
6108                                                         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
6109                                                         check_added_monitors!(nodes[0], 1);
6110                                                 }
6111                                         }
6112                                 }
6113                         }
6114                 }
6115
6116                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
6117                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6118                 if messages_delivered < 2 {
6119                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (1, 0), (0, 0), (0, 0), (false, false));
6120                         //TODO: Deduplicate PaymentSent events, then enable this if:
6121                         //if messages_delivered < 1 {
6122                                 let events_4 = nodes[0].node.get_and_clear_pending_events();
6123                                 assert_eq!(events_4.len(), 1);
6124                                 match events_4[0] {
6125                                         Event::PaymentSent { ref payment_preimage } => {
6126                                                 assert_eq!(payment_preimage_1, *payment_preimage);
6127                                         },
6128                                         _ => panic!("Unexpected event"),
6129                                 }
6130                         //}
6131                 } else if messages_delivered == 2 {
6132                         // nodes[0] still wants its RAA + commitment_signed
6133                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, -1), (0, 0), (0, 0), (0, 0), (false, true));
6134                 } else if messages_delivered == 3 {
6135                         // nodes[0] still wants its commitment_signed
6136                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, -1), (0, 0), (0, 0), (0, 0), (false, false));
6137                 } else if messages_delivered == 4 {
6138                         // nodes[1] still wants its final RAA
6139                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (true, false));
6140                 } else if messages_delivered == 5 {
6141                         // Everything was delivered...
6142                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
6143                 }
6144
6145                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
6146                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6147                 reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
6148
6149                 // Channel should still work fine...
6150                 let payment_preimage_2 = send_along_route(&nodes[0], route, &[&nodes[1]], 1000000).0;
6151                 claim_payment(&nodes[0], &[&nodes[1]], payment_preimage_2);
6152         }
6153
6154         #[test]
6155         fn test_drop_messages_peer_disconnect_a() {
6156                 do_test_drop_messages_peer_disconnect(0);
6157                 do_test_drop_messages_peer_disconnect(1);
6158                 do_test_drop_messages_peer_disconnect(2);
6159                 do_test_drop_messages_peer_disconnect(3);
6160         }
6161
6162         #[test]
6163         fn test_drop_messages_peer_disconnect_b() {
6164                 do_test_drop_messages_peer_disconnect(4);
6165                 do_test_drop_messages_peer_disconnect(5);
6166                 do_test_drop_messages_peer_disconnect(6);
6167         }
6168
6169         #[test]
6170         fn test_funding_peer_disconnect() {
6171                 // Test that we can lock in our funding tx while disconnected
6172                 let nodes = create_network(2);
6173                 let tx = create_chan_between_nodes_with_value_init(&nodes[0], &nodes[1], 100000, 10001);
6174
6175                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
6176                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6177
6178                 confirm_transaction(&nodes[0].chain_monitor, &tx, tx.version);
6179                 let events_1 = nodes[0].node.get_and_clear_pending_msg_events();
6180                 assert_eq!(events_1.len(), 1);
6181                 match events_1[0] {
6182                         MessageSendEvent::SendFundingLocked { ref node_id, msg: _ } => {
6183                                 assert_eq!(*node_id, nodes[1].node.get_our_node_id());
6184                         },
6185                         _ => panic!("Unexpected event"),
6186                 }
6187
6188                 confirm_transaction(&nodes[1].chain_monitor, &tx, tx.version);
6189                 let events_2 = nodes[1].node.get_and_clear_pending_msg_events();
6190                 assert_eq!(events_2.len(), 1);
6191                 match events_2[0] {
6192                         MessageSendEvent::SendFundingLocked { ref node_id, msg: _ } => {
6193                                 assert_eq!(*node_id, nodes[0].node.get_our_node_id());
6194                         },
6195                         _ => panic!("Unexpected event"),
6196                 }
6197
6198                 reconnect_nodes(&nodes[0], &nodes[1], true, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
6199                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
6200                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6201                 reconnect_nodes(&nodes[0], &nodes[1], true, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
6202
6203                 // TODO: We shouldn't need to manually pass list_usable_chanels here once we support
6204                 // rebroadcasting announcement_signatures upon reconnect.
6205
6206                 let route = nodes[0].router.get_route(&nodes[1].node.get_our_node_id(), Some(&nodes[0].node.list_usable_channels()), &Vec::new(), 1000000, TEST_FINAL_CLTV).unwrap();
6207                 let (payment_preimage, _) = send_along_route(&nodes[0], route, &[&nodes[1]], 1000000);
6208                 claim_payment(&nodes[0], &[&nodes[1]], payment_preimage);
6209         }
6210
6211         #[test]
6212         fn test_drop_messages_peer_disconnect_dual_htlc() {
6213                 // Test that we can handle reconnecting when both sides of a channel have pending
6214                 // commitment_updates when we disconnect.
6215                 let mut nodes = create_network(2);
6216                 create_announced_chan_between_nodes(&nodes, 0, 1);
6217
6218                 let (payment_preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
6219
6220                 // Now try to send a second payment which will fail to send
6221                 let route = nodes[0].router.get_route(&nodes[1].node.get_our_node_id(), None, &Vec::new(), 1000000, TEST_FINAL_CLTV).unwrap();
6222                 let (payment_preimage_2, payment_hash_2) = get_payment_preimage_hash!(nodes[0]);
6223
6224                 nodes[0].node.send_payment(route.clone(), payment_hash_2).unwrap();
6225                 check_added_monitors!(nodes[0], 1);
6226
6227                 let events_1 = nodes[0].node.get_and_clear_pending_msg_events();
6228                 assert_eq!(events_1.len(), 1);
6229                 match events_1[0] {
6230                         MessageSendEvent::UpdateHTLCs { .. } => {},
6231                         _ => panic!("Unexpected event"),
6232                 }
6233
6234                 assert!(nodes[1].node.claim_funds(payment_preimage_1));
6235                 check_added_monitors!(nodes[1], 1);
6236
6237                 let events_2 = nodes[1].node.get_and_clear_pending_msg_events();
6238                 assert_eq!(events_2.len(), 1);
6239                 match events_2[0] {
6240                         MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
6241                                 assert_eq!(*node_id, nodes[0].node.get_our_node_id());
6242                                 assert!(update_add_htlcs.is_empty());
6243                                 assert_eq!(update_fulfill_htlcs.len(), 1);
6244                                 assert!(update_fail_htlcs.is_empty());
6245                                 assert!(update_fail_malformed_htlcs.is_empty());
6246                                 assert!(update_fee.is_none());
6247
6248                                 nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &update_fulfill_htlcs[0]).unwrap();
6249                                 let events_3 = nodes[0].node.get_and_clear_pending_events();
6250                                 assert_eq!(events_3.len(), 1);
6251                                 match events_3[0] {
6252                                         Event::PaymentSent { ref payment_preimage } => {
6253                                                 assert_eq!(*payment_preimage, payment_preimage_1);
6254                                         },
6255                                         _ => panic!("Unexpected event"),
6256                                 }
6257
6258                                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), commitment_signed).unwrap();
6259                                 let _ = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
6260                                 // No commitment_signed so get_event_msg's assert(len == 1) passes
6261                                 check_added_monitors!(nodes[0], 1);
6262                         },
6263                         _ => panic!("Unexpected event"),
6264                 }
6265
6266                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
6267                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6268
6269                 nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id());
6270                 let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
6271                 assert_eq!(reestablish_1.len(), 1);
6272                 nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id());
6273                 let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
6274                 assert_eq!(reestablish_2.len(), 1);
6275
6276                 nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[0]).unwrap();
6277                 let as_resp = handle_chan_reestablish_msgs!(nodes[0], nodes[1]);
6278                 nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]).unwrap();
6279                 let bs_resp = handle_chan_reestablish_msgs!(nodes[1], nodes[0]);
6280
6281                 assert!(as_resp.0.is_none());
6282                 assert!(bs_resp.0.is_none());
6283
6284                 assert!(bs_resp.1.is_none());
6285                 assert!(bs_resp.2.is_none());
6286
6287                 assert!(as_resp.3 == RAACommitmentOrder::CommitmentFirst);
6288
6289                 assert_eq!(as_resp.2.as_ref().unwrap().update_add_htlcs.len(), 1);
6290                 assert!(as_resp.2.as_ref().unwrap().update_fulfill_htlcs.is_empty());
6291                 assert!(as_resp.2.as_ref().unwrap().update_fail_htlcs.is_empty());
6292                 assert!(as_resp.2.as_ref().unwrap().update_fail_malformed_htlcs.is_empty());
6293                 assert!(as_resp.2.as_ref().unwrap().update_fee.is_none());
6294                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &as_resp.2.as_ref().unwrap().update_add_htlcs[0]).unwrap();
6295                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_resp.2.as_ref().unwrap().commitment_signed).unwrap();
6296                 let bs_revoke_and_ack = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
6297                 // No commitment_signed so get_event_msg's assert(len == 1) passes
6298                 check_added_monitors!(nodes[1], 1);
6299
6300                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), as_resp.1.as_ref().unwrap()).unwrap();
6301                 let bs_second_commitment_signed = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
6302                 assert!(bs_second_commitment_signed.update_add_htlcs.is_empty());
6303                 assert!(bs_second_commitment_signed.update_fulfill_htlcs.is_empty());
6304                 assert!(bs_second_commitment_signed.update_fail_htlcs.is_empty());
6305                 assert!(bs_second_commitment_signed.update_fail_malformed_htlcs.is_empty());
6306                 assert!(bs_second_commitment_signed.update_fee.is_none());
6307                 check_added_monitors!(nodes[1], 1);
6308
6309                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_and_ack).unwrap();
6310                 let as_commitment_signed = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6311                 assert!(as_commitment_signed.update_add_htlcs.is_empty());
6312                 assert!(as_commitment_signed.update_fulfill_htlcs.is_empty());
6313                 assert!(as_commitment_signed.update_fail_htlcs.is_empty());
6314                 assert!(as_commitment_signed.update_fail_malformed_htlcs.is_empty());
6315                 assert!(as_commitment_signed.update_fee.is_none());
6316                 check_added_monitors!(nodes[0], 1);
6317
6318                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_second_commitment_signed.commitment_signed).unwrap();
6319                 let as_revoke_and_ack = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
6320                 // No commitment_signed so get_event_msg's assert(len == 1) passes
6321                 check_added_monitors!(nodes[0], 1);
6322
6323                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_commitment_signed.commitment_signed).unwrap();
6324                 let bs_second_revoke_and_ack = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
6325                 // No commitment_signed so get_event_msg's assert(len == 1) passes
6326                 check_added_monitors!(nodes[1], 1);
6327
6328                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_and_ack).unwrap();
6329                 assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
6330                 check_added_monitors!(nodes[1], 1);
6331
6332                 let events_4 = nodes[1].node.get_and_clear_pending_events();
6333                 assert_eq!(events_4.len(), 1);
6334                 match events_4[0] {
6335                         Event::PendingHTLCsForwardable { .. } => { },
6336                         _ => panic!("Unexpected event"),
6337                 };
6338
6339                 nodes[1].node.channel_state.lock().unwrap().next_forward = Instant::now();
6340                 nodes[1].node.process_pending_htlc_forwards();
6341
6342                 let events_5 = nodes[1].node.get_and_clear_pending_events();
6343                 assert_eq!(events_5.len(), 1);
6344                 match events_5[0] {
6345                         Event::PaymentReceived { ref payment_hash, amt: _ } => {
6346                                 assert_eq!(payment_hash_2, *payment_hash);
6347                         },
6348                         _ => panic!("Unexpected event"),
6349                 }
6350
6351                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_second_revoke_and_ack).unwrap();
6352                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
6353                 check_added_monitors!(nodes[0], 1);
6354
6355                 claim_payment(&nodes[0], &[&nodes[1]], payment_preimage_2);
6356         }
6357
6358         #[test]
6359         fn test_simple_monitor_permanent_update_fail() {
6360                 // Test that we handle a simple permanent monitor update failure
6361                 let mut nodes = create_network(2);
6362                 create_announced_chan_between_nodes(&nodes, 0, 1);
6363
6364                 let route = nodes[0].router.get_route(&nodes[1].node.get_our_node_id(), None, &Vec::new(), 1000000, TEST_FINAL_CLTV).unwrap();
6365                 let (_, payment_hash_1) = get_payment_preimage_hash!(nodes[0]);
6366
6367                 *nodes[0].chan_monitor.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::PermanentFailure);
6368                 if let Err(APIError::MonitorUpdateFailed) = nodes[0].node.send_payment(route, payment_hash_1) {} else { panic!(); }
6369                 check_added_monitors!(nodes[0], 1);
6370
6371                 let events_1 = nodes[0].node.get_and_clear_pending_msg_events();
6372                 assert_eq!(events_1.len(), 1);
6373                 match events_1[0] {
6374                         MessageSendEvent::BroadcastChannelUpdate { .. } => {},
6375                         _ => panic!("Unexpected event"),
6376                 };
6377
6378                 // TODO: Once we hit the chain with the failure transaction we should check that we get a
6379                 // PaymentFailed event
6380
6381                 assert_eq!(nodes[0].node.list_channels().len(), 0);
6382         }
6383
6384         fn do_test_simple_monitor_temporary_update_fail(disconnect: bool) {
6385                 // Test that we can recover from a simple temporary monitor update failure optionally with
6386                 // a disconnect in between
6387                 let mut nodes = create_network(2);
6388                 create_announced_chan_between_nodes(&nodes, 0, 1);
6389
6390                 let route = nodes[0].router.get_route(&nodes[1].node.get_our_node_id(), None, &Vec::new(), 1000000, TEST_FINAL_CLTV).unwrap();
6391                 let (payment_preimage_1, payment_hash_1) = get_payment_preimage_hash!(nodes[0]);
6392
6393                 *nodes[0].chan_monitor.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::TemporaryFailure);
6394                 if let Err(APIError::MonitorUpdateFailed) = nodes[0].node.send_payment(route.clone(), payment_hash_1) {} else { panic!(); }
6395                 check_added_monitors!(nodes[0], 1);
6396
6397                 assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
6398                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
6399                 assert_eq!(nodes[0].node.list_channels().len(), 1);
6400
6401                 if disconnect {
6402                         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
6403                         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6404                         reconnect_nodes(&nodes[0], &nodes[1], true, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
6405                 }
6406
6407                 *nodes[0].chan_monitor.update_ret.lock().unwrap() = Ok(());
6408                 nodes[0].node.test_restore_channel_monitor();
6409                 check_added_monitors!(nodes[0], 1);
6410
6411                 let mut events_2 = nodes[0].node.get_and_clear_pending_msg_events();
6412                 assert_eq!(events_2.len(), 1);
6413                 let payment_event = SendEvent::from_event(events_2.pop().unwrap());
6414                 assert_eq!(payment_event.node_id, nodes[1].node.get_our_node_id());
6415                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
6416                 commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
6417
6418                 expect_pending_htlcs_forwardable!(nodes[1]);
6419
6420                 let events_3 = nodes[1].node.get_and_clear_pending_events();
6421                 assert_eq!(events_3.len(), 1);
6422                 match events_3[0] {
6423                         Event::PaymentReceived { ref payment_hash, amt } => {
6424                                 assert_eq!(payment_hash_1, *payment_hash);
6425                                 assert_eq!(amt, 1000000);
6426                         },
6427                         _ => panic!("Unexpected event"),
6428                 }
6429
6430                 claim_payment(&nodes[0], &[&nodes[1]], payment_preimage_1);
6431
6432                 // Now set it to failed again...
6433                 let (_, payment_hash_2) = get_payment_preimage_hash!(nodes[0]);
6434                 *nodes[0].chan_monitor.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::TemporaryFailure);
6435                 if let Err(APIError::MonitorUpdateFailed) = nodes[0].node.send_payment(route, payment_hash_2) {} else { panic!(); }
6436                 check_added_monitors!(nodes[0], 1);
6437
6438                 assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
6439                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
6440                 assert_eq!(nodes[0].node.list_channels().len(), 1);
6441
6442                 if disconnect {
6443                         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
6444                         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6445                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
6446                 }
6447
6448                 // ...and make sure we can force-close a TemporaryFailure channel with a PermanentFailure
6449                 *nodes[0].chan_monitor.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::PermanentFailure);
6450                 nodes[0].node.test_restore_channel_monitor();
6451                 check_added_monitors!(nodes[0], 1);
6452
6453                 let events_5 = nodes[0].node.get_and_clear_pending_msg_events();
6454                 assert_eq!(events_5.len(), 1);
6455                 match events_5[0] {
6456                         MessageSendEvent::BroadcastChannelUpdate { .. } => {},
6457                         _ => panic!("Unexpected event"),
6458                 }
6459
6460                 // TODO: Once we hit the chain with the failure transaction we should check that we get a
6461                 // PaymentFailed event
6462
6463                 assert_eq!(nodes[0].node.list_channels().len(), 0);
6464         }
6465
6466         #[test]
6467         fn test_simple_monitor_temporary_update_fail() {
6468                 do_test_simple_monitor_temporary_update_fail(false);
6469                 do_test_simple_monitor_temporary_update_fail(true);
6470         }
6471
6472         fn do_test_monitor_temporary_update_fail(disconnect_count: usize) {
6473                 let disconnect_flags = 8 | 16;
6474
6475                 // Test that we can recover from a temporary monitor update failure with some in-flight
6476                 // HTLCs going on at the same time potentially with some disconnection thrown in.
6477                 // * First we route a payment, then get a temporary monitor update failure when trying to
6478                 //   route a second payment. We then claim the first payment.
6479                 // * If disconnect_count is set, we will disconnect at this point (which is likely as
6480                 //   TemporaryFailure likely indicates net disconnect which resulted in failing to update
6481                 //   the ChannelMonitor on a watchtower).
6482                 // * If !(disconnect_count & 16) we deliver a update_fulfill_htlc/CS for the first payment
6483                 //   immediately, otherwise we wait sconnect and deliver them via the reconnect
6484                 //   channel_reestablish processing (ie disconnect_count & 16 makes no sense if
6485                 //   disconnect_count & !disconnect_flags is 0).
6486                 // * We then update the channel monitor, reconnecting if disconnect_count is set and walk
6487                 //   through message sending, potentially disconnect/reconnecting multiple times based on
6488                 //   disconnect_count, to get the update_fulfill_htlc through.
6489                 // * We then walk through more message exchanges to get the original update_add_htlc
6490                 //   through, swapping message ordering based on disconnect_count & 8 and optionally
6491                 //   disconnect/reconnecting based on disconnect_count.
6492                 let mut nodes = create_network(2);
6493                 create_announced_chan_between_nodes(&nodes, 0, 1);
6494
6495                 let (payment_preimage_1, _) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
6496
6497                 // Now try to send a second payment which will fail to send
6498                 let route = nodes[0].router.get_route(&nodes[1].node.get_our_node_id(), None, &Vec::new(), 1000000, TEST_FINAL_CLTV).unwrap();
6499                 let (payment_preimage_2, payment_hash_2) = get_payment_preimage_hash!(nodes[0]);
6500
6501                 *nodes[0].chan_monitor.update_ret.lock().unwrap() = Err(ChannelMonitorUpdateErr::TemporaryFailure);
6502                 if let Err(APIError::MonitorUpdateFailed) = nodes[0].node.send_payment(route.clone(), payment_hash_2) {} else { panic!(); }
6503                 check_added_monitors!(nodes[0], 1);
6504
6505                 assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
6506                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
6507                 assert_eq!(nodes[0].node.list_channels().len(), 1);
6508
6509                 // Claim the previous payment, which will result in a update_fulfill_htlc/CS from nodes[1]
6510                 // but nodes[0] won't respond since it is frozen.
6511                 assert!(nodes[1].node.claim_funds(payment_preimage_1));
6512                 check_added_monitors!(nodes[1], 1);
6513                 let events_2 = nodes[1].node.get_and_clear_pending_msg_events();
6514                 assert_eq!(events_2.len(), 1);
6515                 let (bs_initial_fulfill, bs_initial_commitment_signed) = match events_2[0] {
6516                         MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
6517                                 assert_eq!(*node_id, nodes[0].node.get_our_node_id());
6518                                 assert!(update_add_htlcs.is_empty());
6519                                 assert_eq!(update_fulfill_htlcs.len(), 1);
6520                                 assert!(update_fail_htlcs.is_empty());
6521                                 assert!(update_fail_malformed_htlcs.is_empty());
6522                                 assert!(update_fee.is_none());
6523
6524                                 if (disconnect_count & 16) == 0 {
6525                                         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &update_fulfill_htlcs[0]).unwrap();
6526                                         let events_3 = nodes[0].node.get_and_clear_pending_events();
6527                                         assert_eq!(events_3.len(), 1);
6528                                         match events_3[0] {
6529                                                 Event::PaymentSent { ref payment_preimage } => {
6530                                                         assert_eq!(*payment_preimage, payment_preimage_1);
6531                                                 },
6532                                                 _ => panic!("Unexpected event"),
6533                                         }
6534
6535                                         if let Err(msgs::HandleError{err, action: Some(msgs::ErrorAction::IgnoreError) }) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), commitment_signed) {
6536                                                 assert_eq!(err, "Previous monitor update failure prevented generation of RAA");
6537                                         } else { panic!(); }
6538                                 }
6539
6540                                 (update_fulfill_htlcs[0].clone(), commitment_signed.clone())
6541                         },
6542                         _ => panic!("Unexpected event"),
6543                 };
6544
6545                 if disconnect_count & !disconnect_flags > 0 {
6546                         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
6547                         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6548                 }
6549
6550                 // Now fix monitor updating...
6551                 *nodes[0].chan_monitor.update_ret.lock().unwrap() = Ok(());
6552                 nodes[0].node.test_restore_channel_monitor();
6553                 check_added_monitors!(nodes[0], 1);
6554
6555                 macro_rules! disconnect_reconnect_peers { () => { {
6556                         nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
6557                         nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6558
6559                         nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id());
6560                         let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
6561                         assert_eq!(reestablish_1.len(), 1);
6562                         nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id());
6563                         let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
6564                         assert_eq!(reestablish_2.len(), 1);
6565
6566                         nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[0]).unwrap();
6567                         let as_resp = handle_chan_reestablish_msgs!(nodes[0], nodes[1]);
6568                         nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]).unwrap();
6569                         let bs_resp = handle_chan_reestablish_msgs!(nodes[1], nodes[0]);
6570
6571                         assert!(as_resp.0.is_none());
6572                         assert!(bs_resp.0.is_none());
6573
6574                         (reestablish_1, reestablish_2, as_resp, bs_resp)
6575                 } } }
6576
6577                 let (payment_event, initial_revoke_and_ack) = if disconnect_count & !disconnect_flags > 0 {
6578                         assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
6579                         assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
6580
6581                         nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id());
6582                         let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
6583                         assert_eq!(reestablish_1.len(), 1);
6584                         nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id());
6585                         let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
6586                         assert_eq!(reestablish_2.len(), 1);
6587
6588                         nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[0]).unwrap();
6589                         check_added_monitors!(nodes[0], 0);
6590                         let mut as_resp = handle_chan_reestablish_msgs!(nodes[0], nodes[1]);
6591                         nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]).unwrap();
6592                         check_added_monitors!(nodes[1], 0);
6593                         let mut bs_resp = handle_chan_reestablish_msgs!(nodes[1], nodes[0]);
6594
6595                         assert!(as_resp.0.is_none());
6596                         assert!(bs_resp.0.is_none());
6597
6598                         assert!(bs_resp.1.is_none());
6599                         if (disconnect_count & 16) == 0 {
6600                                 assert!(bs_resp.2.is_none());
6601
6602                                 assert!(as_resp.1.is_some());
6603                                 assert!(as_resp.2.is_some());
6604                                 assert!(as_resp.3 == RAACommitmentOrder::CommitmentFirst);
6605                         } else {
6606                                 assert!(bs_resp.2.as_ref().unwrap().update_add_htlcs.is_empty());
6607                                 assert!(bs_resp.2.as_ref().unwrap().update_fail_htlcs.is_empty());
6608                                 assert!(bs_resp.2.as_ref().unwrap().update_fail_malformed_htlcs.is_empty());
6609                                 assert!(bs_resp.2.as_ref().unwrap().update_fee.is_none());
6610                                 assert!(bs_resp.2.as_ref().unwrap().update_fulfill_htlcs == vec![bs_initial_fulfill]);
6611                                 assert!(bs_resp.2.as_ref().unwrap().commitment_signed == bs_initial_commitment_signed);
6612
6613                                 assert!(as_resp.1.is_none());
6614
6615                                 nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &bs_resp.2.as_ref().unwrap().update_fulfill_htlcs[0]).unwrap();
6616                                 let events_3 = nodes[0].node.get_and_clear_pending_events();
6617                                 assert_eq!(events_3.len(), 1);
6618                                 match events_3[0] {
6619                                         Event::PaymentSent { ref payment_preimage } => {
6620                                                 assert_eq!(*payment_preimage, payment_preimage_1);
6621                                         },
6622                                         _ => panic!("Unexpected event"),
6623                                 }
6624
6625                                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_resp.2.as_ref().unwrap().commitment_signed).unwrap();
6626                                 let as_resp_raa = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
6627                                 // No commitment_signed so get_event_msg's assert(len == 1) passes
6628                                 check_added_monitors!(nodes[0], 1);
6629
6630                                 as_resp.1 = Some(as_resp_raa);
6631                                 bs_resp.2 = None;
6632                         }
6633
6634                         if disconnect_count & !disconnect_flags > 1 {
6635                                 let (second_reestablish_1, second_reestablish_2, second_as_resp, second_bs_resp) = disconnect_reconnect_peers!();
6636
6637                                 if (disconnect_count & 16) == 0 {
6638                                         assert!(reestablish_1 == second_reestablish_1);
6639                                         assert!(reestablish_2 == second_reestablish_2);
6640                                 }
6641                                 assert!(as_resp == second_as_resp);
6642                                 assert!(bs_resp == second_bs_resp);
6643                         }
6644
6645                         (SendEvent::from_commitment_update(nodes[1].node.get_our_node_id(), as_resp.2.unwrap()), as_resp.1.unwrap())
6646                 } else {
6647                         let mut events_4 = nodes[0].node.get_and_clear_pending_msg_events();
6648                         assert_eq!(events_4.len(), 2);
6649                         (SendEvent::from_event(events_4.remove(0)), match events_4[0] {
6650                                 MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
6651                                         assert_eq!(*node_id, nodes[1].node.get_our_node_id());
6652                                         msg.clone()
6653                                 },
6654                                 _ => panic!("Unexpected event"),
6655                         })
6656                 };
6657
6658                 assert_eq!(payment_event.node_id, nodes[1].node.get_our_node_id());
6659
6660                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
6661                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
6662                 let bs_revoke_and_ack = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
6663                 // nodes[1] is awaiting an RAA from nodes[0] still so get_event_msg's assert(len == 1) passes
6664                 check_added_monitors!(nodes[1], 1);
6665
6666                 if disconnect_count & !disconnect_flags > 2 {
6667                         let (_, _, as_resp, bs_resp) = disconnect_reconnect_peers!();
6668
6669                         assert!(as_resp.1.unwrap() == initial_revoke_and_ack);
6670                         assert!(bs_resp.1.unwrap() == bs_revoke_and_ack);
6671
6672                         assert!(as_resp.2.is_none());
6673                         assert!(bs_resp.2.is_none());
6674                 }
6675
6676                 let as_commitment_update;
6677                 let bs_second_commitment_update;
6678
6679                 macro_rules! handle_bs_raa { () => {
6680                         nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_and_ack).unwrap();
6681                         as_commitment_update = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
6682                         assert!(as_commitment_update.update_add_htlcs.is_empty());
6683                         assert!(as_commitment_update.update_fulfill_htlcs.is_empty());
6684                         assert!(as_commitment_update.update_fail_htlcs.is_empty());
6685                         assert!(as_commitment_update.update_fail_malformed_htlcs.is_empty());
6686                         assert!(as_commitment_update.update_fee.is_none());
6687                         check_added_monitors!(nodes[0], 1);
6688                 } }
6689
6690                 macro_rules! handle_initial_raa { () => {
6691                         nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &initial_revoke_and_ack).unwrap();
6692                         bs_second_commitment_update = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
6693                         assert!(bs_second_commitment_update.update_add_htlcs.is_empty());
6694                         assert!(bs_second_commitment_update.update_fulfill_htlcs.is_empty());
6695                         assert!(bs_second_commitment_update.update_fail_htlcs.is_empty());
6696                         assert!(bs_second_commitment_update.update_fail_malformed_htlcs.is_empty());
6697                         assert!(bs_second_commitment_update.update_fee.is_none());
6698                         check_added_monitors!(nodes[1], 1);
6699                 } }
6700
6701                 if (disconnect_count & 8) == 0 {
6702                         handle_bs_raa!();
6703
6704                         if disconnect_count & !disconnect_flags > 3 {
6705                                 let (_, _, as_resp, bs_resp) = disconnect_reconnect_peers!();
6706
6707                                 assert!(as_resp.1.unwrap() == initial_revoke_and_ack);
6708                                 assert!(bs_resp.1.is_none());
6709
6710                                 assert!(as_resp.2.unwrap() == as_commitment_update);
6711                                 assert!(bs_resp.2.is_none());
6712
6713                                 assert!(as_resp.3 == RAACommitmentOrder::RevokeAndACKFirst);
6714                         }
6715
6716                         handle_initial_raa!();
6717
6718                         if disconnect_count & !disconnect_flags > 4 {
6719                                 let (_, _, as_resp, bs_resp) = disconnect_reconnect_peers!();
6720
6721                                 assert!(as_resp.1.is_none());
6722                                 assert!(bs_resp.1.is_none());
6723
6724                                 assert!(as_resp.2.unwrap() == as_commitment_update);
6725                                 assert!(bs_resp.2.unwrap() == bs_second_commitment_update);
6726                         }
6727                 } else {
6728                         handle_initial_raa!();
6729
6730                         if disconnect_count & !disconnect_flags > 3 {
6731                                 let (_, _, as_resp, bs_resp) = disconnect_reconnect_peers!();
6732
6733                                 assert!(as_resp.1.is_none());
6734                                 assert!(bs_resp.1.unwrap() == bs_revoke_and_ack);
6735
6736                                 assert!(as_resp.2.is_none());
6737                                 assert!(bs_resp.2.unwrap() == bs_second_commitment_update);
6738
6739                                 assert!(bs_resp.3 == RAACommitmentOrder::RevokeAndACKFirst);
6740                         }
6741
6742                         handle_bs_raa!();
6743
6744                         if disconnect_count & !disconnect_flags > 4 {
6745                                 let (_, _, as_resp, bs_resp) = disconnect_reconnect_peers!();
6746
6747                                 assert!(as_resp.1.is_none());
6748                                 assert!(bs_resp.1.is_none());
6749
6750                                 assert!(as_resp.2.unwrap() == as_commitment_update);
6751                                 assert!(bs_resp.2.unwrap() == bs_second_commitment_update);
6752                         }
6753                 }
6754
6755                 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_second_commitment_update.commitment_signed).unwrap();
6756                 let as_revoke_and_ack = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
6757                 // No commitment_signed so get_event_msg's assert(len == 1) passes
6758                 check_added_monitors!(nodes[0], 1);
6759
6760                 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_commitment_update.commitment_signed).unwrap();
6761                 let bs_second_revoke_and_ack = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
6762                 // No commitment_signed so get_event_msg's assert(len == 1) passes
6763                 check_added_monitors!(nodes[1], 1);
6764
6765                 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_and_ack).unwrap();
6766                 assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
6767                 check_added_monitors!(nodes[1], 1);
6768
6769                 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_second_revoke_and_ack).unwrap();
6770                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
6771                 check_added_monitors!(nodes[0], 1);
6772
6773                 expect_pending_htlcs_forwardable!(nodes[1]);
6774
6775                 let events_5 = nodes[1].node.get_and_clear_pending_events();
6776                 assert_eq!(events_5.len(), 1);
6777                 match events_5[0] {
6778                         Event::PaymentReceived { ref payment_hash, amt } => {
6779                                 assert_eq!(payment_hash_2, *payment_hash);
6780                                 assert_eq!(amt, 1000000);
6781                         },
6782                         _ => panic!("Unexpected event"),
6783                 }
6784
6785                 claim_payment(&nodes[0], &[&nodes[1]], payment_preimage_2);
6786         }
6787
6788         #[test]
6789         fn test_monitor_temporary_update_fail_a() {
6790                 do_test_monitor_temporary_update_fail(0);
6791                 do_test_monitor_temporary_update_fail(1);
6792                 do_test_monitor_temporary_update_fail(2);
6793                 do_test_monitor_temporary_update_fail(3);
6794                 do_test_monitor_temporary_update_fail(4);
6795                 do_test_monitor_temporary_update_fail(5);
6796         }
6797
6798         #[test]
6799         fn test_monitor_temporary_update_fail_b() {
6800                 do_test_monitor_temporary_update_fail(2 | 8);
6801                 do_test_monitor_temporary_update_fail(3 | 8);
6802                 do_test_monitor_temporary_update_fail(4 | 8);
6803                 do_test_monitor_temporary_update_fail(5 | 8);
6804         }
6805
6806         #[test]
6807         fn test_monitor_temporary_update_fail_c() {
6808                 do_test_monitor_temporary_update_fail(1 | 16);
6809                 do_test_monitor_temporary_update_fail(2 | 16);
6810                 do_test_monitor_temporary_update_fail(3 | 16);
6811                 do_test_monitor_temporary_update_fail(2 | 8 | 16);
6812                 do_test_monitor_temporary_update_fail(3 | 8 | 16);
6813         }
6814
6815         #[test]
6816         fn test_invalid_channel_announcement() {
6817                 //Test BOLT 7 channel_announcement msg requirement for final node, gather data to build customed channel_announcement msgs
6818                 let secp_ctx = Secp256k1::new();
6819                 let nodes = create_network(2);
6820
6821                 let chan_announcement = create_chan_between_nodes(&nodes[0], &nodes[1]);
6822
6823                 let a_channel_lock = nodes[0].node.channel_state.lock().unwrap();
6824                 let b_channel_lock = nodes[1].node.channel_state.lock().unwrap();
6825                 let as_chan = a_channel_lock.by_id.get(&chan_announcement.3).unwrap();
6826                 let bs_chan = b_channel_lock.by_id.get(&chan_announcement.3).unwrap();
6827
6828                 let _ = nodes[0].router.handle_htlc_fail_channel_update(&msgs::HTLCFailChannelUpdate::ChannelClosed { short_channel_id : as_chan.get_short_channel_id().unwrap(), is_permanent: false } );
6829
6830                 let as_bitcoin_key = PublicKey::from_secret_key(&secp_ctx, &as_chan.get_local_keys().funding_key);
6831                 let bs_bitcoin_key = PublicKey::from_secret_key(&secp_ctx, &bs_chan.get_local_keys().funding_key);
6832
6833                 let as_network_key = nodes[0].node.get_our_node_id();
6834                 let bs_network_key = nodes[1].node.get_our_node_id();
6835
6836                 let were_node_one = as_bitcoin_key.serialize()[..] < bs_bitcoin_key.serialize()[..];
6837
6838                 let mut chan_announcement;
6839
6840                 macro_rules! dummy_unsigned_msg {
6841                         () => {
6842                                 msgs::UnsignedChannelAnnouncement {
6843                                         features: msgs::GlobalFeatures::new(),
6844                                         chain_hash: genesis_block(Network::Testnet).header.bitcoin_hash(),
6845                                         short_channel_id: as_chan.get_short_channel_id().unwrap(),
6846                                         node_id_1: if were_node_one { as_network_key } else { bs_network_key },
6847                                         node_id_2: if were_node_one { bs_network_key } else { as_network_key },
6848                                         bitcoin_key_1: if were_node_one { as_bitcoin_key } else { bs_bitcoin_key },
6849                                         bitcoin_key_2: if were_node_one { bs_bitcoin_key } else { as_bitcoin_key },
6850                                         excess_data: Vec::new(),
6851                                 };
6852                         }
6853                 }
6854
6855                 macro_rules! sign_msg {
6856                         ($unsigned_msg: expr) => {
6857                                 let msghash = Message::from_slice(&Sha256dHash::from_data(&$unsigned_msg.encode()[..])[..]).unwrap();
6858                                 let as_bitcoin_sig = secp_ctx.sign(&msghash, &as_chan.get_local_keys().funding_key);
6859                                 let bs_bitcoin_sig = secp_ctx.sign(&msghash, &bs_chan.get_local_keys().funding_key);
6860                                 let as_node_sig = secp_ctx.sign(&msghash, &nodes[0].node.our_network_key);
6861                                 let bs_node_sig = secp_ctx.sign(&msghash, &nodes[1].node.our_network_key);
6862                                 chan_announcement = msgs::ChannelAnnouncement {
6863                                         node_signature_1 : if were_node_one { as_node_sig } else { bs_node_sig},
6864                                         node_signature_2 : if were_node_one { bs_node_sig } else { as_node_sig},
6865                                         bitcoin_signature_1: if were_node_one { as_bitcoin_sig } else { bs_bitcoin_sig },
6866                                         bitcoin_signature_2 : if were_node_one { bs_bitcoin_sig } else { as_bitcoin_sig },
6867                                         contents: $unsigned_msg
6868                                 }
6869                         }
6870                 }
6871
6872                 let unsigned_msg = dummy_unsigned_msg!();
6873                 sign_msg!(unsigned_msg);
6874                 assert_eq!(nodes[0].router.handle_channel_announcement(&chan_announcement).unwrap(), true);
6875                 let _ = nodes[0].router.handle_htlc_fail_channel_update(&msgs::HTLCFailChannelUpdate::ChannelClosed { short_channel_id : as_chan.get_short_channel_id().unwrap(), is_permanent: false } );
6876
6877                 // Configured with Network::Testnet
6878                 let mut unsigned_msg = dummy_unsigned_msg!();
6879                 unsigned_msg.chain_hash = genesis_block(Network::Bitcoin).header.bitcoin_hash();
6880                 sign_msg!(unsigned_msg);
6881                 assert!(nodes[0].router.handle_channel_announcement(&chan_announcement).is_err());
6882
6883                 let mut unsigned_msg = dummy_unsigned_msg!();
6884                 unsigned_msg.chain_hash = Sha256dHash::from_data(&[1,2,3,4,5,6,7,8,9]);
6885                 sign_msg!(unsigned_msg);
6886                 assert!(nodes[0].router.handle_channel_announcement(&chan_announcement).is_err());
6887         }
6888
6889         struct VecWriter(Vec<u8>);
6890         impl Writer for VecWriter {
6891                 fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
6892                         self.0.extend_from_slice(buf);
6893                         Ok(())
6894                 }
6895                 fn size_hint(&mut self, size: usize) {
6896                         self.0.reserve_exact(size);
6897                 }
6898         }
6899
6900         #[test]
6901         fn test_no_txn_manager_serialize_deserialize() {
6902                 let mut nodes = create_network(2);
6903
6904                 let tx = create_chan_between_nodes_with_value_init(&nodes[0], &nodes[1], 100000, 10001);
6905
6906                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6907
6908                 let nodes_0_serialized = nodes[0].node.encode();
6909                 let mut chan_0_monitor_serialized = VecWriter(Vec::new());
6910                 nodes[0].chan_monitor.simple_monitor.monitors.lock().unwrap().iter().next().unwrap().1.write_for_disk(&mut chan_0_monitor_serialized).unwrap();
6911
6912                 nodes[0].chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(nodes[0].chain_monitor.clone(), nodes[0].tx_broadcaster.clone(), Arc::new(test_utils::TestLogger::new())));
6913                 let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
6914                 let (_, chan_0_monitor) = <(Sha256dHash, ChannelMonitor)>::read(&mut chan_0_monitor_read, Arc::new(test_utils::TestLogger::new())).unwrap();
6915                 assert!(chan_0_monitor_read.is_empty());
6916
6917                 let mut nodes_0_read = &nodes_0_serialized[..];
6918                 let config = UserConfig::new();
6919                 let keys_manager = Arc::new(keysinterface::KeysManager::new(&nodes[0].node_seed, Network::Testnet, Arc::new(test_utils::TestLogger::new())));
6920                 let (_, nodes_0_deserialized) = {
6921                         let mut channel_monitors = HashMap::new();
6922                         channel_monitors.insert(chan_0_monitor.get_funding_txo().unwrap(), &chan_0_monitor);
6923                         <(Sha256dHash, ChannelManager)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
6924                                 default_config: config,
6925                                 keys_manager,
6926                                 fee_estimator: Arc::new(test_utils::TestFeeEstimator { sat_per_kw: 253 }),
6927                                 monitor: nodes[0].chan_monitor.clone(),
6928                                 chain_monitor: nodes[0].chain_monitor.clone(),
6929                                 tx_broadcaster: nodes[0].tx_broadcaster.clone(),
6930                                 logger: Arc::new(test_utils::TestLogger::new()),
6931                                 channel_monitors: &channel_monitors,
6932                         }).unwrap()
6933                 };
6934                 assert!(nodes_0_read.is_empty());
6935
6936                 assert!(nodes[0].chan_monitor.add_update_monitor(chan_0_monitor.get_funding_txo().unwrap(), chan_0_monitor).is_ok());
6937                 nodes[0].node = Arc::new(nodes_0_deserialized);
6938                 let nodes_0_as_listener: Arc<ChainListener> = nodes[0].node.clone();
6939                 nodes[0].chain_monitor.register_listener(Arc::downgrade(&nodes_0_as_listener));
6940                 assert_eq!(nodes[0].node.list_channels().len(), 1);
6941                 check_added_monitors!(nodes[0], 1);
6942
6943                 nodes[0].node.peer_connected(&nodes[1].node.get_our_node_id());
6944                 let reestablish_1 = get_chan_reestablish_msgs!(nodes[0], nodes[1]);
6945                 nodes[1].node.peer_connected(&nodes[0].node.get_our_node_id());
6946                 let reestablish_2 = get_chan_reestablish_msgs!(nodes[1], nodes[0]);
6947
6948                 nodes[1].node.handle_channel_reestablish(&nodes[0].node.get_our_node_id(), &reestablish_1[0]).unwrap();
6949                 assert!(nodes[1].node.get_and_clear_pending_msg_events().is_empty());
6950                 nodes[0].node.handle_channel_reestablish(&nodes[1].node.get_our_node_id(), &reestablish_2[0]).unwrap();
6951                 assert!(nodes[0].node.get_and_clear_pending_msg_events().is_empty());
6952
6953                 let (funding_locked, _) = create_chan_between_nodes_with_value_confirm(&nodes[0], &nodes[1], &tx);
6954                 let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(&nodes[0], &nodes[1], &funding_locked);
6955                 for node in nodes.iter() {
6956                         assert!(node.router.handle_channel_announcement(&announcement).unwrap());
6957                         node.router.handle_channel_update(&as_update).unwrap();
6958                         node.router.handle_channel_update(&bs_update).unwrap();
6959                 }
6960
6961                 send_payment(&nodes[0], &[&nodes[1]], 1000000);
6962         }
6963
6964         #[test]
6965         fn test_simple_manager_serialize_deserialize() {
6966                 let mut nodes = create_network(2);
6967                 create_announced_chan_between_nodes(&nodes, 0, 1);
6968
6969                 let (our_payment_preimage, _) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
6970                 let (_, our_payment_hash) = route_payment(&nodes[0], &[&nodes[1]], 1000000);
6971
6972                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
6973
6974                 let nodes_0_serialized = nodes[0].node.encode();
6975                 let mut chan_0_monitor_serialized = VecWriter(Vec::new());
6976                 nodes[0].chan_monitor.simple_monitor.monitors.lock().unwrap().iter().next().unwrap().1.write_for_disk(&mut chan_0_monitor_serialized).unwrap();
6977
6978                 nodes[0].chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(nodes[0].chain_monitor.clone(), nodes[0].tx_broadcaster.clone(), Arc::new(test_utils::TestLogger::new())));
6979                 let mut chan_0_monitor_read = &chan_0_monitor_serialized.0[..];
6980                 let (_, chan_0_monitor) = <(Sha256dHash, ChannelMonitor)>::read(&mut chan_0_monitor_read, Arc::new(test_utils::TestLogger::new())).unwrap();
6981                 assert!(chan_0_monitor_read.is_empty());
6982
6983                 let mut nodes_0_read = &nodes_0_serialized[..];
6984                 let keys_manager = Arc::new(keysinterface::KeysManager::new(&nodes[0].node_seed, Network::Testnet, Arc::new(test_utils::TestLogger::new())));
6985                 let (_, nodes_0_deserialized) = {
6986                         let mut channel_monitors = HashMap::new();
6987                         channel_monitors.insert(chan_0_monitor.get_funding_txo().unwrap(), &chan_0_monitor);
6988                         <(Sha256dHash, ChannelManager)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
6989                                 default_config: UserConfig::new(),
6990                                 keys_manager,
6991                                 fee_estimator: Arc::new(test_utils::TestFeeEstimator { sat_per_kw: 253 }),
6992                                 monitor: nodes[0].chan_monitor.clone(),
6993                                 chain_monitor: nodes[0].chain_monitor.clone(),
6994                                 tx_broadcaster: nodes[0].tx_broadcaster.clone(),
6995                                 logger: Arc::new(test_utils::TestLogger::new()),
6996                                 channel_monitors: &channel_monitors,
6997                         }).unwrap()
6998                 };
6999                 assert!(nodes_0_read.is_empty());
7000
7001                 assert!(nodes[0].chan_monitor.add_update_monitor(chan_0_monitor.get_funding_txo().unwrap(), chan_0_monitor).is_ok());
7002                 nodes[0].node = Arc::new(nodes_0_deserialized);
7003                 check_added_monitors!(nodes[0], 1);
7004
7005                 reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
7006
7007                 fail_payment(&nodes[0], &[&nodes[1]], our_payment_hash);
7008                 claim_payment(&nodes[0], &[&nodes[1]], our_payment_preimage);
7009         }
7010
7011         #[test]
7012         fn test_manager_serialize_deserialize_inconsistent_monitor() {
7013                 // Test deserializing a ChannelManager with a out-of-date ChannelMonitor
7014                 let mut nodes = create_network(4);
7015                 create_announced_chan_between_nodes(&nodes, 0, 1);
7016                 create_announced_chan_between_nodes(&nodes, 2, 0);
7017                 let (_, _, channel_id, funding_tx) = create_announced_chan_between_nodes(&nodes, 0, 3);
7018
7019                 let (our_payment_preimage, _) = route_payment(&nodes[2], &[&nodes[0], &nodes[1]], 1000000);
7020
7021                 // Serialize the ChannelManager here, but the monitor we keep up-to-date
7022                 let nodes_0_serialized = nodes[0].node.encode();
7023
7024                 route_payment(&nodes[0], &[&nodes[3]], 1000000);
7025                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
7026                 nodes[2].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
7027                 nodes[3].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
7028
7029                 // Now the ChannelMonitor (which is now out-of-sync with ChannelManager for channel w/
7030                 // nodes[3])
7031                 let mut node_0_monitors_serialized = Vec::new();
7032                 for monitor in nodes[0].chan_monitor.simple_monitor.monitors.lock().unwrap().iter() {
7033                         let mut writer = VecWriter(Vec::new());
7034                         monitor.1.write_for_disk(&mut writer).unwrap();
7035                         node_0_monitors_serialized.push(writer.0);
7036                 }
7037
7038                 nodes[0].chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(nodes[0].chain_monitor.clone(), nodes[0].tx_broadcaster.clone(), Arc::new(test_utils::TestLogger::new())));
7039                 let mut node_0_monitors = Vec::new();
7040                 for serialized in node_0_monitors_serialized.iter() {
7041                         let mut read = &serialized[..];
7042                         let (_, monitor) = <(Sha256dHash, ChannelMonitor)>::read(&mut read, Arc::new(test_utils::TestLogger::new())).unwrap();
7043                         assert!(read.is_empty());
7044                         node_0_monitors.push(monitor);
7045                 }
7046
7047                 let mut nodes_0_read = &nodes_0_serialized[..];
7048                 let keys_manager = Arc::new(keysinterface::KeysManager::new(&nodes[0].node_seed, Network::Testnet, Arc::new(test_utils::TestLogger::new())));
7049                 let (_, nodes_0_deserialized) = <(Sha256dHash, ChannelManager)>::read(&mut nodes_0_read, ChannelManagerReadArgs {
7050                         default_config: UserConfig::new(),
7051                         keys_manager,
7052                         fee_estimator: Arc::new(test_utils::TestFeeEstimator { sat_per_kw: 253 }),
7053                         monitor: nodes[0].chan_monitor.clone(),
7054                         chain_monitor: nodes[0].chain_monitor.clone(),
7055                         tx_broadcaster: nodes[0].tx_broadcaster.clone(),
7056                         logger: Arc::new(test_utils::TestLogger::new()),
7057                         channel_monitors: &node_0_monitors.iter().map(|monitor| { (monitor.get_funding_txo().unwrap(), monitor) }).collect(),
7058                 }).unwrap();
7059                 assert!(nodes_0_read.is_empty());
7060
7061                 { // Channel close should result in a commitment tx and an HTLC tx
7062                         let txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
7063                         assert_eq!(txn.len(), 2);
7064                         assert_eq!(txn[0].input[0].previous_output.txid, funding_tx.txid());
7065                         assert_eq!(txn[1].input[0].previous_output.txid, txn[0].txid());
7066                 }
7067
7068                 for monitor in node_0_monitors.drain(..) {
7069                         assert!(nodes[0].chan_monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor).is_ok());
7070                         check_added_monitors!(nodes[0], 1);
7071                 }
7072                 nodes[0].node = Arc::new(nodes_0_deserialized);
7073
7074                 // nodes[1] and nodes[2] have no lost state with nodes[0]...
7075                 reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
7076                 reconnect_nodes(&nodes[0], &nodes[2], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
7077                 //... and we can even still claim the payment!
7078                 claim_payment(&nodes[2], &[&nodes[0], &nodes[1]], our_payment_preimage);
7079
7080                 nodes[3].node.peer_connected(&nodes[0].node.get_our_node_id());
7081                 let reestablish = get_event_msg!(nodes[3], MessageSendEvent::SendChannelReestablish, nodes[0].node.get_our_node_id());
7082                 nodes[0].node.peer_connected(&nodes[3].node.get_our_node_id());
7083                 if let Err(msgs::HandleError { action: Some(msgs::ErrorAction::SendErrorMessage { msg }), .. }) = nodes[0].node.handle_channel_reestablish(&nodes[3].node.get_our_node_id(), &reestablish) {
7084                         assert_eq!(msg.channel_id, channel_id);
7085                 } else { panic!("Unexpected result"); }
7086         }
7087 }