git.bitcoin.ninja 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, ChannelKeys};
  26 use ln::channelmonitor::ManyChannelMonitor;
  27 use ln::router::{Route,RouteHop};
  28 use ln::msgs;
  29 use ln::msgs::{HandleError,ChannelMessageHandler};
  30 use util::{byte_utils, events, internal_traits, rng};
  31 use util::sha2::Sha256;
  32 use util::ser::{Readable, Writeable};
  33 use util::chacha20poly1305rfc::ChaCha20;
  34 use util::logger::Logger;
  35 use util::errors::APIError;
  36
  37 use crypto;
  38 use crypto::mac::{Mac,MacResult};
  39 use crypto::hmac::Hmac;
  40 use crypto::digest::Digest;
  41 use crypto::symmetriccipher::SynchronousStreamCipher;
  42
  43 use std::{ptr, mem};
  44 use std::collections::HashMap;
  45 use std::collections::hash_map;
  46 use std::io::Cursor;
  47 use std::sync::{Mutex,MutexGuard,Arc};
  48 use std::sync::atomic::{AtomicUsize, Ordering};
  49 use std::time::{Instant,Duration};
  50
  51 /// We hold various information about HTLC relay in the HTLC objects in Channel itself:
  52 ///
  53 /// Upon receipt of an HTLC from a peer, we'll give it a PendingHTLCStatus indicating if it should
  54 /// forward the HTLC with information it will give back to us when it does so, or if it should Fail
  55 /// the HTLC with the relevant message for the Channel to handle giving to the remote peer.
  56 ///
  57 /// When a Channel forwards an HTLC to its peer, it will give us back the PendingForwardHTLCInfo
  58 /// which we will use to construct an outbound HTLC, with a relevant HTLCSource::PreviousHopData
  59 /// filled in to indicate where it came from (which we can use to either fail-backwards or fulfill
  60 /// the HTLC backwards along the relevant path).
  61 /// Alternatively, we can fill an outbound HTLC with a HTLCSource::OutboundRoute indicating this is
  62 /// our payment, which we can use to decode errors or inform the user that the payment was sent.
  63 mod channel_held_info {
  64         use ln::msgs;
  65         use ln::router::Route;
  66         use secp256k1::key::SecretKey;
  67         use secp256k1::ecdh::SharedSecret;
  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: SharedSecret,
  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: SharedSecret,
  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                 },
 109         }
 110         #[cfg(test)]
 111         impl HTLCSource {
 112                 pub fn dummy() -> Self {
 113                         HTLCSource::OutboundRoute {
 114                                 route: Route { hops: Vec::new() },
 115                                 session_priv: SecretKey::from_slice(&::secp256k1::Secp256k1::without_caps(), &[1; 32]).unwrap(),
 116                         }
 117                 }
 118         }
 119
 120         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
 121         pub(crate) enum HTLCFailReason {
 122                 ErrorPacket {
 123                         err: msgs::OnionErrorPacket,
 124                 },
 125                 Reason {
 126                         failure_code: u16,
 127                         data: Vec<u8>,
 128                 }
 129         }
 130 }
 131 pub(super) use self::channel_held_info::*;
 132
 133 struct MsgHandleErrInternal {
 134         err: msgs::HandleError,
 135         needs_channel_force_close: bool,
 136 }
 137 impl MsgHandleErrInternal {
 138         #[inline]
 139         fn send_err_msg_no_close(err: &'static str, channel_id: [u8; 32]) -> Self {
 140                 Self {
 141                         err: HandleError {
 142                                 err,
 143                                 action: Some(msgs::ErrorAction::SendErrorMessage {
 144                                         msg: msgs::ErrorMessage {
 145                                                 channel_id,
 146                                                 data: err.to_string()
 147                                         },
 148                                 }),
 149                         },
 150                         needs_channel_force_close: false,
 151                 }
 152         }
 153         #[inline]
 154         fn send_err_msg_close_chan(err: &'static str, channel_id: [u8; 32]) -> Self {
 155                 Self {
 156                         err: HandleError {
 157                                 err,
 158                                 action: Some(msgs::ErrorAction::SendErrorMessage {
 159                                         msg: msgs::ErrorMessage {
 160                                                 channel_id,
 161                                                 data: err.to_string()
 162                                         },
 163                                 }),
 164                         },
 165                         needs_channel_force_close: true,
 166                 }
 167         }
 168         #[inline]
 169         fn from_maybe_close(err: msgs::HandleError) -> Self {
 170                 Self { err, needs_channel_force_close: true }
 171         }
 172         #[inline]
 173         fn from_no_close(err: msgs::HandleError) -> Self {
 174                 Self { err, needs_channel_force_close: false }
 175         }
 176         #[inline]
 177         fn from_chan_no_close(err: ChannelError, channel_id: [u8; 32]) -> Self {
 178                 Self {
 179                         err: match err {
 180                                 ChannelError::Ignore(msg) => HandleError {
 181                                         err: msg,
 182                                         action: Some(msgs::ErrorAction::IgnoreError),
 183                                 },
 184                                 ChannelError::Close(msg) => HandleError {
 185                                         err: msg,
 186                                         action: Some(msgs::ErrorAction::SendErrorMessage {
 187                                                 msg: msgs::ErrorMessage {
 188                                                         channel_id,
 189                                                         data: msg.to_string()
 190                                                 },
 191                                         }),
 192                                 },
 193                         },
 194                         needs_channel_force_close: false,
 195                 }
 196         }
 197         #[inline]
 198         fn from_chan_maybe_close(err: ChannelError, channel_id: [u8; 32]) -> Self {
 199                 Self {
 200                         err: match err {
 201                                 ChannelError::Ignore(msg) => HandleError {
 202                                         err: msg,
 203                                         action: Some(msgs::ErrorAction::IgnoreError),
 204                                 },
 205                                 ChannelError::Close(msg) => HandleError {
 206                                         err: msg,
 207                                         action: Some(msgs::ErrorAction::SendErrorMessage {
 208                                                 msg: msgs::ErrorMessage {
 209                                                         channel_id,
 210                                                         data: msg.to_string()
 211                                                 },
 212                                         }),
 213                                 },
 214                         },
 215                         needs_channel_force_close: true,
 216                 }
 217         }
 218 }
 219
 220 /// We hold back HTLCs we intend to relay for a random interval in the range (this, 5*this). This
 221 /// provides some limited amount of privacy. Ideally this would range from somewhere like 1 second
 222 /// to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly. We could
 223 /// probably increase this significantly.
 224 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u32 = 50;
 225
 226 struct HTLCForwardInfo {
 227         prev_short_channel_id: u64,
 228         prev_htlc_id: u64,
 229         forward_info: PendingForwardHTLCInfo,
 230 }
 231
 232 struct ChannelHolder {
 233         by_id: HashMap<[u8; 32], Channel>,
 234         short_to_id: HashMap<u64, [u8; 32]>,
 235         next_forward: Instant,
 236         /// short channel id -> forward infos. Key of 0 means payments received
 237         /// Note that while this is held in the same mutex as the channels themselves, no consistency
 238         /// guarantees are made about there existing a channel with the short id here, nor the short
 239         /// ids in the PendingForwardHTLCInfo!
 240         forward_htlcs: HashMap<u64, Vec<HTLCForwardInfo>>,
 241         /// Note that while this is held in the same mutex as the channels themselves, no consistency
 242         /// guarantees are made about the channels given here actually existing anymore by the time you
 243         /// go to read them!
 244         claimable_htlcs: HashMap<[u8; 32], Vec<HTLCPreviousHopData>>,
 245 }
 246 struct MutChannelHolder<'a> {
 247         by_id: &'a mut HashMap<[u8; 32], Channel>,
 248         short_to_id: &'a mut HashMap<u64, [u8; 32]>,
 249         next_forward: &'a mut Instant,
 250         forward_htlcs: &'a mut HashMap<u64, Vec<HTLCForwardInfo>>,
 251         claimable_htlcs: &'a mut HashMap<[u8; 32], Vec<HTLCPreviousHopData>>,
 252 }
 253 impl ChannelHolder {
 254         fn borrow_parts(&mut self) -> MutChannelHolder {
 255                 MutChannelHolder {
 256                         by_id: &mut self.by_id,
 257                         short_to_id: &mut self.short_to_id,
 258                         next_forward: &mut self.next_forward,
 259                         forward_htlcs: &mut self.forward_htlcs,
 260                         claimable_htlcs: &mut self.claimable_htlcs,
 261                 }
 262         }
 263 }
 264
 265 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
 266 const ERR: () = "You need at least 32 bit pointers (well, usize, but we'll assume they're the same) for ChannelManager::latest_block_height";
 267
 268 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 269 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
 270 ///
 271 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
 272 /// to individual Channels.
 273 pub struct ChannelManager {
 274         genesis_hash: Sha256dHash,
 275         fee_estimator: Arc<FeeEstimator>,
 276         monitor: Arc<ManyChannelMonitor>,
 277         chain_monitor: Arc<ChainWatchInterface>,
 278         tx_broadcaster: Arc<BroadcasterInterface>,
 279
 280         announce_channels_publicly: bool,
 281         fee_proportional_millionths: u32,
 282         latest_block_height: AtomicUsize,
 283         secp_ctx: Secp256k1<secp256k1::All>,
 284
 285         channel_state: Mutex<ChannelHolder>,
 286         our_network_key: SecretKey,
 287
 288         pending_events: Mutex<Vec<events::Event>>,
 289
 290         logger: Arc<Logger>,
 291 }
 292
 293 const CLTV_EXPIRY_DELTA: u16 = 6 * 24 * 2; //TODO?
 294
 295 macro_rules! secp_call {
 296         ( $res: expr, $err: expr ) => {
 297                 match $res {
 298                         Ok(key) => key,
 299                         Err(_) => return Err($err),
 300                 }
 301         };
 302 }
 303
 304 struct OnionKeys {
 305         #[cfg(test)]
 306         shared_secret: SharedSecret,
 307         #[cfg(test)]
 308         blinding_factor: [u8; 32],
 309         ephemeral_pubkey: PublicKey,
 310         rho: [u8; 32],
 311         mu: [u8; 32],
 312 }
 313
 314 /// Details of a channel, as returned by ChannelManager::list_channels and ChannelManager::list_usable_channels
 315 pub struct ChannelDetails {
 316         /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
 317         /// thereafter this is the txid of the funding transaction xor the funding transaction output).
 318         /// Note that this means this value is *not* persistent - it can change once during the
 319         /// lifetime of the channel.
 320         pub channel_id: [u8; 32],
 321         /// The position of the funding transaction in the chain. None if the funding transaction has
 322         /// not yet been confirmed and the channel fully opened.
 323         pub short_channel_id: Option<u64>,
 324         /// The node_id of our counterparty
 325         pub remote_network_id: PublicKey,
 326         /// The value, in satoshis, of this channel as appears in the funding output
 327         pub channel_value_satoshis: u64,
 328         /// The user_id passed in to create_channel, or 0 if the channel was inbound.
 329         pub user_id: u64,
 330 }
 331
 332 impl ChannelManager {
 333         /// Constructs a new ChannelManager to hold several channels and route between them.
 334         ///
 335         /// This is the main "logic hub" for all channel-related actions, and implements
 336         /// ChannelMessageHandler.
 337         ///
 338         /// fee_proportional_millionths is an optional fee to charge any payments routed through us.
 339         /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
 340         ///
 341         /// panics if channel_value_satoshis is >= `MAX_FUNDING_SATOSHIS`!
 342         pub fn new(our_network_key: SecretKey, fee_proportional_millionths: u32, announce_channels_publicly: bool, network: Network, feeest: Arc<FeeEstimator>, monitor: Arc<ManyChannelMonitor>, chain_monitor: Arc<ChainWatchInterface>, tx_broadcaster: Arc<BroadcasterInterface>, logger: Arc<Logger>) -> Result<Arc<ChannelManager>, secp256k1::Error> {
 343                 let secp_ctx = Secp256k1::new();
 344
 345                 let res = Arc::new(ChannelManager {
 346                         genesis_hash: genesis_block(network).header.bitcoin_hash(),
 347                         fee_estimator: feeest.clone(),
 348                         monitor: monitor.clone(),
 349                         chain_monitor,
 350                         tx_broadcaster,
 351
 352                         announce_channels_publicly,
 353                         fee_proportional_millionths,
 354                         latest_block_height: AtomicUsize::new(0), //TODO: Get an init value (generally need to replay recent chain on chain_monitor registration)
 355                         secp_ctx,
 356
 357                         channel_state: Mutex::new(ChannelHolder{
 358                                 by_id: HashMap::new(),
 359                                 short_to_id: HashMap::new(),
 360                                 next_forward: Instant::now(),
 361                                 forward_htlcs: HashMap::new(),
 362                                 claimable_htlcs: HashMap::new(),
 363                         }),
 364                         our_network_key,
 365
 366                         pending_events: Mutex::new(Vec::new()),
 367
 368                         logger,
 369                 });
 370                 let weak_res = Arc::downgrade(&res);
 371                 res.chain_monitor.register_listener(weak_res);
 372                 Ok(res)
 373         }
 374
 375         /// Creates a new outbound channel to the given remote node and with the given value.
 376         ///
 377         /// user_id will be provided back as user_channel_id in FundingGenerationReady and
 378         /// FundingBroadcastSafe events to allow tracking of which events correspond with which
 379         /// create_channel call. Note that user_channel_id defaults to 0 for inbound channels, so you
 380         /// may wish to avoid using 0 for user_id here.
 381         ///
 382         /// If successful, will generate a SendOpenChannel event, so you should probably poll
 383         /// PeerManager::process_events afterwards.
 384         ///
 385         /// Raises APIError::APIMisuseError when channel_value_satoshis > 2**24 or push_msat being greater than channel_value_satoshis * 1k
 386         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, push_msat: u64, user_id: u64) -> Result<(), APIError> {
 387                 let chan_keys = if cfg!(feature = "fuzztarget") {
 388                         ChannelKeys {
 389                                 funding_key:               SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 390                                 revocation_base_key:       SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 391                                 payment_base_key:          SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 392                                 delayed_payment_base_key:  SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 393                                 htlc_base_key:             SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 394                                 channel_close_key:         SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 395                                 channel_monitor_claim_key: SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]).unwrap(),
 396                                 commitment_seed: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
 397                         }
 398                 } else {
 399                         let mut key_seed = [0u8; 32];
 400                         rng::fill_bytes(&mut key_seed);
 401                         match ChannelKeys::new_from_seed(&key_seed) {
 402                                 Ok(key) => key,
 403                                 Err(_) => panic!("RNG is busted!")
 404                         }
 405                 };
 406
 407                 let channel = Channel::new_outbound(&*self.fee_estimator, chan_keys, their_network_key, channel_value_satoshis, push_msat, self.announce_channels_publicly, user_id, Arc::clone(&self.logger))?;
 408                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator);
 409                 let mut channel_state = self.channel_state.lock().unwrap();
 410                 match channel_state.by_id.entry(channel.channel_id()) {
 411                         hash_map::Entry::Occupied(_) => {
 412                                 if cfg!(feature = "fuzztarget") {
 413                                         return Err(APIError::APIMisuseError { err: "Fuzzy bad RNG" });
 414                                 } else {
 415                                         panic!("RNG is bad???");
 416                                 }
 417                         },
 418                         hash_map::Entry::Vacant(entry) => { entry.insert(channel); }
 419                 }
 420
 421                 let mut events = self.pending_events.lock().unwrap();
 422                 events.push(events::Event::SendOpenChannel {
 423                         node_id: their_network_key,
 424                         msg: res,
 425                 });
 426                 Ok(())
 427         }
 428
 429         /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
 430         /// more information.
 431         pub fn list_channels(&self) -> Vec<ChannelDetails> {
 432                 let channel_state = self.channel_state.lock().unwrap();
 433                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 434                 for (channel_id, channel) in channel_state.by_id.iter() {
 435                         res.push(ChannelDetails {
 436                                 channel_id: (*channel_id).clone(),
 437                                 short_channel_id: channel.get_short_channel_id(),
 438                                 remote_network_id: channel.get_their_node_id(),
 439                                 channel_value_satoshis: channel.get_value_satoshis(),
 440                                 user_id: channel.get_user_id(),
 441                         });
 442                 }
 443                 res
 444         }
 445
 446         /// Gets the list of usable channels, in random order. Useful as an argument to
 447         /// Router::get_route to ensure non-announced channels are used.
 448         pub fn list_usable_channels(&self) -> Vec<ChannelDetails> {
 449                 let channel_state = self.channel_state.lock().unwrap();
 450                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 451                 for (channel_id, channel) in channel_state.by_id.iter() {
 452                         if channel.is_usable() {
 453                                 res.push(ChannelDetails {
 454                                         channel_id: (*channel_id).clone(),
 455                                         short_channel_id: channel.get_short_channel_id(),
 456                                         remote_network_id: channel.get_their_node_id(),
 457                                         channel_value_satoshis: channel.get_value_satoshis(),
 458                                         user_id: channel.get_user_id(),
 459                                 });
 460                         }
 461                 }
 462                 res
 463         }
 464
 465         /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
 466         /// will be accepted on the given channel, and after additional timeout/the closing of all
 467         /// pending HTLCs, the channel will be closed on chain.
 468         ///
 469         /// May generate a SendShutdown event on success, which should be relayed.
 470         pub fn close_channel(&self, channel_id: &[u8; 32]) -> Result<(), APIError> {
 471                 let (mut res, node_id, chan_option) = {
 472                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 473                         let channel_state = channel_state_lock.borrow_parts();
 474                         match channel_state.by_id.entry(channel_id.clone()) {
 475                                 hash_map::Entry::Occupied(mut chan_entry) => {
 476                                         let res = chan_entry.get_mut().get_shutdown()?;
 477                                         if chan_entry.get().is_shutdown() {
 478                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
 479                                                         channel_state.short_to_id.remove(&short_id);
 480                                                 }
 481                                                 (res, chan_entry.get().get_their_node_id(), Some(chan_entry.remove_entry().1))
 482                                         } else { (res, chan_entry.get().get_their_node_id(), None) }
 483                                 },
 484                                 hash_map::Entry::Vacant(_) => return Err(APIError::ChannelUnavailable{err: "No such channel"})
 485                         }
 486                 };
 487                 for htlc_source in res.1.drain(..) {
 488                         // unknown_next_peer...I dunno who that is anymore....
 489                         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() });
 490                 }
 491                 let chan_update = if let Some(chan) = chan_option {
 492                         if let Ok(update) = self.get_channel_update(&chan) {
 493                                 Some(update)
 494                         } else { None }
 495                 } else { None };
 496
 497                 let mut events = self.pending_events.lock().unwrap();
 498                 if let Some(update) = chan_update {
 499                         events.push(events::Event::BroadcastChannelUpdate {
 500                                 msg: update
 501                         });
 502                 }
 503                 events.push(events::Event::SendShutdown {
 504                         node_id,
 505                         msg: res.0
 506                 });
 507
 508                 Ok(())
 509         }
 510
 511         #[inline]
 512         fn finish_force_close_channel(&self, shutdown_res: (Vec<Transaction>, Vec<(HTLCSource, [u8; 32])>)) {
 513                 let (local_txn, mut failed_htlcs) = shutdown_res;
 514                 for htlc_source in failed_htlcs.drain(..) {
 515                         // unknown_next_peer...I dunno who that is anymore....
 516                         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() });
 517                 }
 518                 for tx in local_txn {
 519                         self.tx_broadcaster.broadcast_transaction(&tx);
 520                 }
 521                 //TODO: We need to have a way where outbound HTLC claims can result in us claiming the
 522                 //now-on-chain HTLC output for ourselves (and, thereafter, passing the HTLC backwards).
 523                 //TODO: We need to handle monitoring of pending offered HTLCs which just hit the chain and
 524                 //may be claimed, resulting in us claiming the inbound HTLCs (and back-failing after
 525                 //timeouts are hit and our claims confirm).
 526                 //TODO: In any case, we need to make sure we remove any pending htlc tracking (via
 527                 //fail_backwards or claim_funds) eventually for all HTLCs that were in the channel
 528         }
 529
 530         /// Force closes a channel, immediately broadcasting the latest local commitment transaction to
 531         /// the chain and rejecting new HTLCs on the given channel.
 532         pub fn force_close_channel(&self, channel_id: &[u8; 32]) {
 533                 let mut chan = {
 534                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 535                         let channel_state = channel_state_lock.borrow_parts();
 536                         if let Some(chan) = channel_state.by_id.remove(channel_id) {
 537                                 if let Some(short_id) = chan.get_short_channel_id() {
 538                                         channel_state.short_to_id.remove(&short_id);
 539                                 }
 540                                 chan
 541                         } else {
 542                                 return;
 543                         }
 544                 };
 545                 self.finish_force_close_channel(chan.force_shutdown());
 546                 let mut events = self.pending_events.lock().unwrap();
 547                 if let Ok(update) = self.get_channel_update(&chan) {
 548                         events.push(events::Event::BroadcastChannelUpdate {
 549                                 msg: update
 550                         });
 551                 }
 552         }
 553
 554         /// Force close all channels, immediately broadcasting the latest local commitment transaction
 555         /// for each to the chain and rejecting new HTLCs on each.
 556         pub fn force_close_all_channels(&self) {
 557                 for chan in self.list_channels() {
 558                         self.force_close_channel(&chan.channel_id);
 559                 }
 560         }
 561
 562         #[inline]
 563         fn gen_rho_mu_from_shared_secret(shared_secret: &SharedSecret) -> ([u8; 32], [u8; 32]) {
 564                 ({
 565                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 566                         hmac.input(&shared_secret[..]);
 567                         let mut res = [0; 32];
 568                         hmac.raw_result(&mut res);
 569                         res
 570                 },
 571                 {
 572                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 573                         hmac.input(&shared_secret[..]);
 574                         let mut res = [0; 32];
 575                         hmac.raw_result(&mut res);
 576                         res
 577                 })
 578         }
 579
 580         #[inline]
 581         fn gen_um_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 582                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 583                 hmac.input(&shared_secret[..]);
 584                 let mut res = [0; 32];
 585                 hmac.raw_result(&mut res);
 586                 res
 587         }
 588
 589         #[inline]
 590         fn gen_ammag_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 591                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 592                 hmac.input(&shared_secret[..]);
 593                 let mut res = [0; 32];
 594                 hmac.raw_result(&mut res);
 595                 res
 596         }
 597
 598         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 599         #[inline]
 600         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> {
 601                 let mut blinded_priv = session_priv.clone();
 602                 let mut blinded_pub = PublicKey::from_secret_key(secp_ctx, &blinded_priv);
 603
 604                 for hop in route.hops.iter() {
 605                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 606
 607                         let mut sha = Sha256::new();
 608                         sha.input(&blinded_pub.serialize()[..]);
 609                         sha.input(&shared_secret[..]);
 610                         let mut blinding_factor = [0u8; 32];
 611                         sha.result(&mut blinding_factor);
 612
 613                         let ephemeral_pubkey = blinded_pub;
 614
 615                         blinded_priv.mul_assign(secp_ctx, &SecretKey::from_slice(secp_ctx, &blinding_factor)?)?;
 616                         blinded_pub = PublicKey::from_secret_key(secp_ctx, &blinded_priv);
 617
 618                         callback(shared_secret, blinding_factor, ephemeral_pubkey, hop);
 619                 }
 620
 621                 Ok(())
 622         }
 623
 624         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 625         fn construct_onion_keys<T: secp256k1::Signing>(secp_ctx: &Secp256k1<T>, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, secp256k1::Error> {
 626                 let mut res = Vec::with_capacity(route.hops.len());
 627
 628                 Self::construct_onion_keys_callback(secp_ctx, route, session_priv, |shared_secret, _blinding_factor, ephemeral_pubkey, _| {
 629                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 630
 631                         res.push(OnionKeys {
 632                                 #[cfg(test)]
 633                                 shared_secret,
 634                                 #[cfg(test)]
 635                                 blinding_factor: _blinding_factor,
 636                                 ephemeral_pubkey,
 637                                 rho,
 638                                 mu,
 639                         });
 640                 })?;
 641
 642                 Ok(res)
 643         }
 644
 645         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 646         fn build_onion_payloads(route: &Route, starting_htlc_offset: u32) -> Result<(Vec<msgs::OnionHopData>, u64, u32), APIError> {
 647                 let mut cur_value_msat = 0u64;
 648                 let mut cur_cltv = starting_htlc_offset;
 649                 let mut last_short_channel_id = 0;
 650                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 651                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 652                 unsafe { res.set_len(route.hops.len()); }
 653
 654                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 655                         // First hop gets special values so that it can check, on receipt, that everything is
 656                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 657                         // the intended recipient).
 658                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 659                         let cltv = if cur_cltv == starting_htlc_offset { hop.cltv_expiry_delta + starting_htlc_offset } else { cur_cltv };
 660                         res[idx] = msgs::OnionHopData {
 661                                 realm: 0,
 662                                 data: msgs::OnionRealm0HopData {
 663                                         short_channel_id: last_short_channel_id,
 664                                         amt_to_forward: value_msat,
 665                                         outgoing_cltv_value: cltv,
 666                                 },
 667                                 hmac: [0; 32],
 668                         };
 669                         cur_value_msat += hop.fee_msat;
 670                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 671                                 return Err(APIError::RouteError{err: "Channel fees overflowed?!"});
 672                         }
 673                         cur_cltv += hop.cltv_expiry_delta as u32;
 674                         if cur_cltv >= 500000000 {
 675                                 return Err(APIError::RouteError{err: "Channel CLTV overflowed?!"});
 676                         }
 677                         last_short_channel_id = hop.short_channel_id;
 678                 }
 679                 Ok((res, cur_value_msat, cur_cltv))
 680         }
 681
 682         #[inline]
 683         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 684                 unsafe {
 685                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 686                 }
 687                 for i in 0..65 {
 688                         arr[i] = 0;
 689                 }
 690         }
 691
 692         #[inline]
 693         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 694                 assert_eq!(dst.len(), src.len());
 695
 696                 for i in 0..dst.len() {
 697                         dst[i] ^= src[i];
 698                 }
 699         }
 700
 701         const ZERO:[u8; 21*65] = [0; 21*65];
 702         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: &[u8; 32]) -> msgs::OnionPacket {
 703                 let mut buf = Vec::with_capacity(21*65);
 704                 buf.resize(21*65, 0);
 705
 706                 let filler = {
 707                         let iters = payloads.len() - 1;
 708                         let end_len = iters * 65;
 709                         let mut res = Vec::with_capacity(end_len);
 710                         res.resize(end_len, 0);
 711
 712                         for (i, keys) in onion_keys.iter().enumerate() {
 713                                 if i == payloads.len() - 1 { continue; }
 714                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 715                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 716                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 717                         }
 718                         res
 719                 };
 720
 721                 let mut packet_data = [0; 20*65];
 722                 let mut hmac_res = [0; 32];
 723
 724                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 725                         ChannelManager::shift_arr_right(&mut packet_data);
 726                         payload.hmac = hmac_res;
 727                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 728
 729                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 730                         chacha.process(&packet_data, &mut buf[0..20*65]);
 731                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 732
 733                         if i == 0 {
 734                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 735                         }
 736
 737                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 738                         hmac.input(&packet_data);
 739                         hmac.input(&associated_data[..]);
 740                         hmac.raw_result(&mut hmac_res);
 741                 }
 742
 743                 msgs::OnionPacket{
 744                         version: 0,
 745                         public_key: Ok(onion_keys.first().unwrap().ephemeral_pubkey),
 746                         hop_data: packet_data,
 747                         hmac: hmac_res,
 748                 }
 749         }
 750
 751         /// Encrypts a failure packet. raw_packet can either be a
 752         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 753         fn encrypt_failure_packet(shared_secret: &SharedSecret, raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 754                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 755
 756                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 757                 packet_crypted.resize(raw_packet.len(), 0);
 758                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 759                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 760                 msgs::OnionErrorPacket {
 761                         data: packet_crypted,
 762                 }
 763         }
 764
 765         fn build_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 766                 assert!(failure_data.len() <= 256 - 2);
 767
 768                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 769
 770                 let failuremsg = {
 771                         let mut res = Vec::with_capacity(2 + failure_data.len());
 772                         res.push(((failure_type >> 8) & 0xff) as u8);
 773                         res.push(((failure_type >> 0) & 0xff) as u8);
 774                         res.extend_from_slice(&failure_data[..]);
 775                         res
 776                 };
 777                 let pad = {
 778                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 779                         res.resize(256 - 2 - failure_data.len(), 0);
 780                         res
 781                 };
 782                 let mut packet = msgs::DecodedOnionErrorPacket {
 783                         hmac: [0; 32],
 784                         failuremsg: failuremsg,
 785                         pad: pad,
 786                 };
 787
 788                 let mut hmac = Hmac::new(Sha256::new(), &um);
 789                 hmac.input(&packet.encode()[32..]);
 790                 hmac.raw_result(&mut packet.hmac);
 791
 792                 packet
 793         }
 794
 795         #[inline]
 796         fn build_first_hop_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 797                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 798                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 799         }
 800
 801         fn decode_update_add_htlc_onion(&self, msg: &msgs::UpdateAddHTLC) -> (PendingHTLCStatus, MutexGuard<ChannelHolder>) {
 802                 macro_rules! get_onion_hash {
 803                         () => {
 804                                 {
 805                                         let mut sha = Sha256::new();
 806                                         sha.input(&msg.onion_routing_packet.hop_data);
 807                                         let mut onion_hash = [0; 32];
 808                                         sha.result(&mut onion_hash);
 809                                         onion_hash
 810                                 }
 811                         }
 812                 }
 813
 814                 if let Err(_) = msg.onion_routing_packet.public_key {
 815                         log_info!(self, "Failed to accept/forward incoming HTLC with invalid ephemeral pubkey");
 816                         return (PendingHTLCStatus::Fail(HTLCFailureMsg::Malformed(msgs::UpdateFailMalformedHTLC {
 817                                 channel_id: msg.channel_id,
 818                                 htlc_id: msg.htlc_id,
 819                                 sha256_of_onion: get_onion_hash!(),
 820                                 failure_code: 0x8000 | 0x4000 | 6,
 821                         })), self.channel_state.lock().unwrap());
 822                 }
 823
 824                 let shared_secret = SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key.unwrap(), &self.our_network_key);
 825                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 826
 827                 let mut channel_state = None;
 828                 macro_rules! return_err {
 829                         ($msg: expr, $err_code: expr, $data: expr) => {
 830                                 {
 831                                         log_info!(self, "Failed to accept/forward incoming HTLC: {}", $msg);
 832                                         if channel_state.is_none() {
 833                                                 channel_state = Some(self.channel_state.lock().unwrap());
 834                                         }
 835                                         return (PendingHTLCStatus::Fail(HTLCFailureMsg::Relay(msgs::UpdateFailHTLC {
 836                                                 channel_id: msg.channel_id,
 837                                                 htlc_id: msg.htlc_id,
 838                                                 reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
 839                                         })), channel_state.unwrap());
 840                                 }
 841                         }
 842                 }
 843
 844                 if msg.onion_routing_packet.version != 0 {
 845                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
 846                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
 847                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
 848                         //receiving node would have to brute force to figure out which version was put in the
 849                         //packet by the node that send us the message, in the case of hashing the hop_data, the
 850                         //node knows the HMAC matched, so they already know what is there...
 851                         return_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4, &get_onion_hash!());
 852                 }
 853
 854                 let mut hmac = Hmac::new(Sha256::new(), &mu);
 855                 hmac.input(&msg.onion_routing_packet.hop_data);
 856                 hmac.input(&msg.payment_hash);
 857                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
 858                         return_err!("HMAC Check failed", 0x8000 | 0x4000 | 5, &get_onion_hash!());
 859                 }
 860
 861                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
 862                 let next_hop_data = {
 863                         let mut decoded = [0; 65];
 864                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
 865                         match msgs::OnionHopData::read(&mut Cursor::new(&decoded[..])) {
 866                                 Err(err) => {
 867                                         let error_code = match err {
 868                                                 msgs::DecodeError::UnknownVersion => 0x4000 | 1, // unknown realm byte
 869                                                 _ => 0x2000 | 2, // Should never happen
 870                                         };
 871                                         return_err!("Unable to decode our hop data", error_code, &[0;0]);
 872                                 },
 873                                 Ok(msg) => msg
 874                         }
 875                 };
 876
 877                 //TODO: Check that msg.cltv_expiry is within acceptable bounds!
 878
 879                 let pending_forward_info = if next_hop_data.hmac == [0; 32] {
 880                                 // OUR PAYMENT!
 881                                 if next_hop_data.data.amt_to_forward != msg.amount_msat {
 882                                         return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
 883                                 }
 884                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
 885                                         return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
 886                                 }
 887
 888                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
 889                                 // message, however that would leak that we are the recipient of this payment, so
 890                                 // instead we stay symmetric with the forwarding case, only responding (after a
 891                                 // delay) once they've send us a commitment_signed!
 892
 893                                 PendingHTLCStatus::Forward(PendingForwardHTLCInfo {
 894                                         onion_packet: None,
 895                                         payment_hash: msg.payment_hash.clone(),
 896                                         short_channel_id: 0,
 897                                         incoming_shared_secret: shared_secret.clone(),
 898                                         amt_to_forward: next_hop_data.data.amt_to_forward,
 899                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
 900                                 })
 901                         } else {
 902                                 let mut new_packet_data = [0; 20*65];
 903                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
 904                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
 905
 906                                 let mut new_pubkey = msg.onion_routing_packet.public_key.unwrap();
 907
 908                                 let blinding_factor = {
 909                                         let mut sha = Sha256::new();
 910                                         sha.input(&new_pubkey.serialize()[..]);
 911                                         sha.input(&shared_secret[..]);
 912                                         let mut res = [0u8; 32];
 913                                         sha.result(&mut res);
 914                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
 915                                                 Err(_) => {
 916                                                         return_err!("Blinding factor is an invalid private key", 0x8000 | 0x4000 | 6, &get_onion_hash!());
 917                                                 },
 918                                                 Ok(key) => key
 919                                         }
 920                                 };
 921
 922                                 if let Err(_) = new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
 923                                         return_err!("New blinding factor is an invalid private key", 0x8000 | 0x4000 | 6, &get_onion_hash!());
 924                                 }
 925
 926                                 let outgoing_packet = msgs::OnionPacket {
 927                                         version: 0,
 928                                         public_key: Ok(new_pubkey),
 929                                         hop_data: new_packet_data,
 930                                         hmac: next_hop_data.hmac.clone(),
 931                                 };
 932
 933                                 PendingHTLCStatus::Forward(PendingForwardHTLCInfo {
 934                                         onion_packet: Some(outgoing_packet),
 935                                         payment_hash: msg.payment_hash.clone(),
 936                                         short_channel_id: next_hop_data.data.short_channel_id,
 937                                         incoming_shared_secret: shared_secret.clone(),
 938                                         amt_to_forward: next_hop_data.data.amt_to_forward,
 939                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
 940                                 })
 941                         };
 942
 943                 channel_state = Some(self.channel_state.lock().unwrap());
 944                 if let &PendingHTLCStatus::Forward(PendingForwardHTLCInfo { ref onion_packet, ref short_channel_id, ref amt_to_forward, ref outgoing_cltv_value, .. }) = &pending_forward_info {
 945                         if onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
 946                                 let id_option = channel_state.as_ref().unwrap().short_to_id.get(&short_channel_id).cloned();
 947                                 let forwarding_id = match id_option {
 948                                         None => {
 949                                                 return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
 950                                         },
 951                                         Some(id) => id.clone(),
 952                                 };
 953                                 if let Some((err, code, chan_update)) = {
 954                                         let chan = channel_state.as_mut().unwrap().by_id.get_mut(&forwarding_id).unwrap();
 955                                         if !chan.is_live() {
 956                                                 Some(("Forwarding channel is not in a ready state.", 0x1000 | 7, self.get_channel_update(chan).unwrap()))
 957                                         } else {
 958                                                 let fee = amt_to_forward.checked_mul(self.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) });
 959                                                 if fee.is_none() || msg.amount_msat < fee.unwrap() || (msg.amount_msat - fee.unwrap()) < *amt_to_forward {
 960                                                         Some(("Prior hop has deviated from specified fees parameters or origin node has obsolete ones", 0x1000 | 12, self.get_channel_update(chan).unwrap()))
 961                                                 } else {
 962                                                         if (msg.cltv_expiry as u64) < (*outgoing_cltv_value) as u64 + CLTV_EXPIRY_DELTA as u64 {
 963                                                                 Some(("Forwarding node has tampered with the intended HTLC values or origin node has an obsolete cltv_expiry_delta", 0x1000 | 13, self.get_channel_update(chan).unwrap()))
 964                                                         } else {
 965                                                                 None
 966                                                         }
 967                                                 }
 968                                         }
 969                                 } {
 970                                         return_err!(err, code, &chan_update.encode_with_len()[..]);
 971                                 }
 972                         }
 973                 }
 974
 975                 (pending_forward_info, channel_state.unwrap())
 976         }
 977
 978         /// only fails if the channel does not yet have an assigned short_id
 979         fn get_channel_update(&self, chan: &Channel) -> Result<msgs::ChannelUpdate, HandleError> {
 980                 let short_channel_id = match chan.get_short_channel_id() {
 981                         None => return Err(HandleError{err: "Channel not yet established", action: None}),
 982                         Some(id) => id,
 983                 };
 984
 985                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).serialize()[..] < chan.get_their_node_id().serialize()[..];
 986
 987                 let unsigned = msgs::UnsignedChannelUpdate {
 988                         chain_hash: self.genesis_hash,
 989                         short_channel_id: short_channel_id,
 990                         timestamp: chan.get_channel_update_count(),
 991                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
 992                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
 993                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
 994                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
 995                         fee_proportional_millionths: self.fee_proportional_millionths,
 996                         excess_data: Vec::new(),
 997                 };
 998
 999                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
1000                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key); //TODO Can we unwrap here?
1001
1002                 Ok(msgs::ChannelUpdate {
1003                         signature: sig,
1004                         contents: unsigned
1005                 })
1006         }
1007
1008         /// Sends a payment along a given route.
1009         ///
1010         /// Value parameters are provided via the last hop in route, see documentation for RouteHop
1011         /// fields for more info.
1012         ///
1013         /// Note that if the payment_hash already exists elsewhere (eg you're sending a duplicative
1014         /// payment), we don't do anything to stop you! We always try to ensure that if the provided
1015         /// next hop knows the preimage to payment_hash they can claim an additional amount as
1016         /// specified in the last hop in the route! Thus, you should probably do your own
1017         /// payment_preimage tracking (which you should already be doing as they represent "proof of
1018         /// payment") and prevent double-sends yourself.
1019         ///
1020         /// May generate a SendHTLCs event on success, which should be relayed.
1021         ///
1022         /// Raises APIError::RoutError when invalid route or forward parameter
1023         /// (cltv_delta, fee, node public key) is specified
1024         pub fn send_payment(&self, route: Route, payment_hash: [u8; 32]) -> Result<(), APIError> {
1025                 if route.hops.len() < 1 || route.hops.len() > 20 {
1026                         return Err(APIError::RouteError{err: "Route didn't go anywhere/had bogus size"});
1027                 }
1028                 let our_node_id = self.get_our_node_id();
1029                 for (idx, hop) in route.hops.iter().enumerate() {
1030                         if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
1031                                 return Err(APIError::RouteError{err: "Route went through us but wasn't a simple rebalance loop to us"});
1032                         }
1033                 }
1034
1035                 let session_priv = SecretKey::from_slice(&self.secp_ctx, &{
1036                         let mut session_key = [0; 32];
1037                         rng::fill_bytes(&mut session_key);
1038                         session_key
1039                 }).expect("RNG is bad!");
1040
1041                 let cur_height = self.latest_block_height.load(Ordering::Acquire) as u32 + 1;
1042
1043                 let onion_keys = secp_call!(ChannelManager::construct_onion_keys(&self.secp_ctx, &route, &session_priv),
1044                                 APIError::RouteError{err: "Pubkey along hop was maliciously selected"});
1045                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route, cur_height)?;
1046                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, &payment_hash);
1047
1048                 let (first_hop_node_id, (update_add, commitment_signed, chan_monitor)) = {
1049                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1050                         let channel_state = channel_state_lock.borrow_parts();
1051
1052                         let id = match channel_state.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
1053                                 None => return Err(APIError::RouteError{err: "No channel available with first hop!"}),
1054                                 Some(id) => id.clone(),
1055                         };
1056
1057                         let res = {
1058                                 let chan = channel_state.by_id.get_mut(&id).unwrap();
1059                                 if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
1060                                         return Err(APIError::RouteError{err: "Node ID mismatch on first hop!"});
1061                                 }
1062                                 if !chan.is_live() {
1063                                         return Err(APIError::RouteError{err: "Peer for first hop currently disconnected!"});
1064                                 }
1065                                 chan.send_htlc_and_commit(htlc_msat, payment_hash.clone(), htlc_cltv, HTLCSource::OutboundRoute {
1066                                         route: route.clone(),
1067                                         session_priv: session_priv.clone(),
1068                                 }, onion_packet).map_err(|he| APIError::RouteError{err: he.err})?
1069                         };
1070
1071                         let first_hop_node_id = route.hops.first().unwrap().pubkey;
1072
1073                         match res {
1074                                 Some(msgs) => (first_hop_node_id, msgs),
1075                                 None => return Ok(()),
1076                         }
1077                 };
1078
1079                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1080                         unimplemented!();
1081                 }
1082
1083                 let mut events = self.pending_events.lock().unwrap();
1084                 events.push(events::Event::UpdateHTLCs {
1085                         node_id: first_hop_node_id,
1086                         updates: msgs::CommitmentUpdate {
1087                                 update_add_htlcs: vec![update_add],
1088                                 update_fulfill_htlcs: Vec::new(),
1089                                 update_fail_htlcs: Vec::new(),
1090                                 update_fail_malformed_htlcs: Vec::new(),
1091                                 update_fee: None,
1092                                 commitment_signed,
1093                         },
1094                 });
1095                 Ok(())
1096         }
1097
1098         /// Call this upon creation of a funding transaction for the given channel.
1099         ///
1100         /// Panics if a funding transaction has already been provided for this channel.
1101         ///
1102         /// May panic if the funding_txo is duplicative with some other channel (note that this should
1103         /// be trivially prevented by using unique funding transaction keys per-channel).
1104         pub fn funding_transaction_generated(&self, temporary_channel_id: &[u8; 32], funding_txo: OutPoint) {
1105
1106                 macro_rules! add_pending_event {
1107                         ($event: expr) => {
1108                                 {
1109                                         let mut pending_events = self.pending_events.lock().unwrap();
1110                                         pending_events.push($event);
1111                                 }
1112                         }
1113                 }
1114
1115                 let (chan, msg, chan_monitor) = {
1116                         let mut channel_state = self.channel_state.lock().unwrap();
1117                         match channel_state.by_id.remove(temporary_channel_id) {
1118                                 Some(mut chan) => {
1119                                         match chan.get_outbound_funding_created(funding_txo) {
1120                                                 Ok(funding_msg) => {
1121                                                         (chan, funding_msg.0, funding_msg.1)
1122                                                 },
1123                                                 Err(e) => {
1124                                                         log_error!(self, "Got bad signatures: {}!", e.err);
1125                                                         mem::drop(channel_state);
1126                                                         add_pending_event!(events::Event::HandleError {
1127                                                                 node_id: chan.get_their_node_id(),
1128                                                                 action: e.action,
1129                                                         });
1130                                                         return;
1131                                                 },
1132                                         }
1133                                 },
1134                                 None => return
1135                         }
1136                 }; // Release channel lock for install_watch_outpoint call,
1137                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1138                         unimplemented!();
1139                 }
1140                 add_pending_event!(events::Event::SendFundingCreated {
1141                         node_id: chan.get_their_node_id(),
1142                         msg: msg,
1143                 });
1144
1145                 let mut channel_state = self.channel_state.lock().unwrap();
1146                 match channel_state.by_id.entry(chan.channel_id()) {
1147                         hash_map::Entry::Occupied(_) => {
1148                                 panic!("Generated duplicate funding txid?");
1149                         },
1150                         hash_map::Entry::Vacant(e) => {
1151                                 e.insert(chan);
1152                         }
1153                 }
1154         }
1155
1156         fn get_announcement_sigs(&self, chan: &Channel) -> Option<msgs::AnnouncementSignatures> {
1157                 if !chan.should_announce() { return None }
1158
1159                 let (announcement, our_bitcoin_sig) = match chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone()) {
1160                         Ok(res) => res,
1161                         Err(_) => return None, // Only in case of state precondition violations eg channel is closing
1162                 };
1163                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1164                 let our_node_sig = self.secp_ctx.sign(&msghash, &self.our_network_key);
1165
1166                 Some(msgs::AnnouncementSignatures {
1167                         channel_id: chan.channel_id(),
1168                         short_channel_id: chan.get_short_channel_id().unwrap(),
1169                         node_signature: our_node_sig,
1170                         bitcoin_signature: our_bitcoin_sig,
1171                 })
1172         }
1173
1174         /// Processes HTLCs which are pending waiting on random forward delay.
1175         ///
1176         /// Should only really ever be called in response to an PendingHTLCsForwardable event.
1177         /// Will likely generate further events.
1178         pub fn process_pending_htlc_forwards(&self) {
1179                 let mut new_events = Vec::new();
1180                 let mut failed_forwards = Vec::new();
1181                 {
1182                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1183                         let channel_state = channel_state_lock.borrow_parts();
1184
1185                         if cfg!(not(feature = "fuzztarget")) && Instant::now() < *channel_state.next_forward {
1186                                 return;
1187                         }
1188
1189                         for (short_chan_id, mut pending_forwards) in channel_state.forward_htlcs.drain() {
1190                                 if short_chan_id != 0 {
1191                                         let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
1192                                                 Some(chan_id) => chan_id.clone(),
1193                                                 None => {
1194                                                         failed_forwards.reserve(pending_forwards.len());
1195                                                         for HTLCForwardInfo { prev_short_channel_id, prev_htlc_id, forward_info } in pending_forwards.drain(..) {
1196                                                                 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
1197                                                                         short_channel_id: prev_short_channel_id,
1198                                                                         htlc_id: prev_htlc_id,
1199                                                                         incoming_packet_shared_secret: forward_info.incoming_shared_secret,
1200                                                                 });
1201                                                                 failed_forwards.push((htlc_source, forward_info.payment_hash, 0x4000 | 10, None));
1202                                                         }
1203                                                         continue;
1204                                                 }
1205                                         };
1206                                         let forward_chan = &mut channel_state.by_id.get_mut(&forward_chan_id).unwrap();
1207
1208                                         let mut add_htlc_msgs = Vec::new();
1209                                         for HTLCForwardInfo { prev_short_channel_id, prev_htlc_id, forward_info } in pending_forwards.drain(..) {
1210                                                 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
1211                                                         short_channel_id: prev_short_channel_id,
1212                                                         htlc_id: prev_htlc_id,
1213                                                         incoming_packet_shared_secret: forward_info.incoming_shared_secret,
1214                                                 });
1215                                                 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()) {
1216                                                         Err(_e) => {
1217                                                                 let chan_update = self.get_channel_update(forward_chan).unwrap();
1218                                                                 failed_forwards.push((htlc_source, forward_info.payment_hash, 0x1000 | 7, Some(chan_update)));
1219                                                                 continue;
1220                                                         },
1221                                                         Ok(update_add) => {
1222                                                                 match update_add {
1223                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
1224                                                                         None => {
1225                                                                                 // Nothing to do here...we're waiting on a remote
1226                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
1227                                                                                 // will automatically handle building the update_add_htlc and
1228                                                                                 // commitment_signed messages when we can.
1229                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
1230                                                                                 // as we don't really want others relying on us relaying through
1231                                                                                 // this channel currently :/.
1232                                                                         }
1233                                                                 }
1234                                                         }
1235                                                 }
1236                                         }
1237
1238                                         if !add_htlc_msgs.is_empty() {
1239                                                 let (commitment_msg, monitor) = match forward_chan.send_commitment() {
1240                                                         Ok(res) => res,
1241                                                         Err(e) => {
1242                                                                 if let &Some(msgs::ErrorAction::DisconnectPeer{msg: Some(ref _err_msg)}) = &e.action {
1243                                                                 } else if let &Some(msgs::ErrorAction::SendErrorMessage{msg: ref _err_msg}) = &e.action {
1244                                                                 } else {
1245                                                                         panic!("Stated return value requirements in send_commitment() were not met");
1246                                                                 }
1247                                                                 //TODO: Handle...this is bad!
1248                                                                 continue;
1249                                                         },
1250                                                 };
1251                                                 new_events.push((Some(monitor), events::Event::UpdateHTLCs {
1252                                                         node_id: forward_chan.get_their_node_id(),
1253                                                         updates: msgs::CommitmentUpdate {
1254                                                                 update_add_htlcs: add_htlc_msgs,
1255                                                                 update_fulfill_htlcs: Vec::new(),
1256                                                                 update_fail_htlcs: Vec::new(),
1257                                                                 update_fail_malformed_htlcs: Vec::new(),
1258                                                                 update_fee: None,
1259                                                                 commitment_signed: commitment_msg,
1260                                                         },
1261                                                 }));
1262                                         }
1263                                 } else {
1264                                         for HTLCForwardInfo { prev_short_channel_id, prev_htlc_id, forward_info } in pending_forwards.drain(..) {
1265                                                 let prev_hop_data = HTLCPreviousHopData {
1266                                                         short_channel_id: prev_short_channel_id,
1267                                                         htlc_id: prev_htlc_id,
1268                                                         incoming_packet_shared_secret: forward_info.incoming_shared_secret,
1269                                                 };
1270                                                 match channel_state.claimable_htlcs.entry(forward_info.payment_hash) {
1271                                                         hash_map::Entry::Occupied(mut entry) => entry.get_mut().push(prev_hop_data),
1272                                                         hash_map::Entry::Vacant(entry) => { entry.insert(vec![prev_hop_data]); },
1273                                                 };
1274                                                 new_events.push((None, events::Event::PaymentReceived {
1275                                                         payment_hash: forward_info.payment_hash,
1276                                                         amt: forward_info.amt_to_forward,
1277                                                 }));
1278                                         }
1279                                 }
1280                         }
1281                 }
1282
1283                 for (htlc_source, payment_hash, failure_code, update) in failed_forwards.drain(..) {
1284                         match update {
1285                                 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source, &payment_hash, HTLCFailReason::Reason { failure_code, data: Vec::new() }),
1286                                 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() }),
1287                         };
1288                 }
1289
1290                 if new_events.is_empty() { return }
1291
1292                 new_events.retain(|event| {
1293                         if let &Some(ref monitor) = &event.0 {
1294                                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor.clone()) {
1295                                         unimplemented!();// but def dont push the event...
1296                                 }
1297                         }
1298                         true
1299                 });
1300
1301                 let mut events = self.pending_events.lock().unwrap();
1302                 events.reserve(new_events.len());
1303                 for event in new_events.drain(..) {
1304                         events.push(event.1);
1305                 }
1306         }
1307
1308         /// Indicates that the preimage for payment_hash is unknown after a PaymentReceived event.
1309         pub fn fail_htlc_backwards(&self, payment_hash: &[u8; 32]) -> bool {
1310                 let mut channel_state = Some(self.channel_state.lock().unwrap());
1311                 let removed_source = channel_state.as_mut().unwrap().claimable_htlcs.remove(payment_hash);
1312                 if let Some(mut sources) = removed_source {
1313                         for htlc_with_hash in sources.drain(..) {
1314                                 if channel_state.is_none() { channel_state = Some(self.channel_state.lock().unwrap()); }
1315                                 self.fail_htlc_backwards_internal(channel_state.take().unwrap(), HTLCSource::PreviousHopData(htlc_with_hash), payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: Vec::new() });
1316                         }
1317                         true
1318                 } else { false }
1319         }
1320
1321         /// Fails an HTLC backwards to the sender of it to us.
1322         /// Note that while we take a channel_state lock as input, we do *not* assume consistency here.
1323         /// There are several callsites that do stupid things like loop over a list of payment_hashes
1324         /// to fail and take the channel_state lock for each iteration (as we take ownership and may
1325         /// drop it). In other words, no assumptions are made that entries in claimable_htlcs point to
1326         /// still-available channels.
1327         fn fail_htlc_backwards_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, source: HTLCSource, payment_hash: &[u8; 32], onion_error: HTLCFailReason) {
1328                 match source {
1329                         HTLCSource::OutboundRoute { .. } => {
1330                                 mem::drop(channel_state);
1331
1332                                 let mut pending_events = self.pending_events.lock().unwrap();
1333                                 pending_events.push(events::Event::PaymentFailed {
1334                                         payment_hash: payment_hash.clone()
1335                                 });
1336                         },
1337                         HTLCSource::PreviousHopData(HTLCPreviousHopData { short_channel_id, htlc_id, incoming_packet_shared_secret }) => {
1338                                 let err_packet = match onion_error {
1339                                         HTLCFailReason::Reason { failure_code, data } => {
1340                                                 let packet = ChannelManager::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
1341                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
1342                                         },
1343                                         HTLCFailReason::ErrorPacket { err } => {
1344                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
1345                                         }
1346                                 };
1347
1348                                 let (node_id, fail_msgs) = {
1349                                         let chan_id = match channel_state.short_to_id.get(&short_channel_id) {
1350                                                 Some(chan_id) => chan_id.clone(),
1351                                                 None => return
1352                                         };
1353
1354                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
1355                                         match chan.get_update_fail_htlc_and_commit(htlc_id, err_packet) {
1356                                                 Ok(msg) => (chan.get_their_node_id(), msg),
1357                                                 Err(_e) => {
1358                                                         //TODO: Do something with e?
1359                                                         return;
1360                                                 },
1361                                         }
1362                                 };
1363
1364                                 match fail_msgs {
1365                                         Some((msg, commitment_msg, chan_monitor)) => {
1366                                                 mem::drop(channel_state);
1367
1368                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1369                                                         unimplemented!();// but def dont push the event...
1370                                                 }
1371
1372                                                 let mut pending_events = self.pending_events.lock().unwrap();
1373                                                 pending_events.push(events::Event::UpdateHTLCs {
1374                                                         node_id,
1375                                                         updates: msgs::CommitmentUpdate {
1376                                                                 update_add_htlcs: Vec::new(),
1377                                                                 update_fulfill_htlcs: Vec::new(),
1378                                                                 update_fail_htlcs: vec![msg],
1379                                                                 update_fail_malformed_htlcs: Vec::new(),
1380                                                                 update_fee: None,
1381                                                                 commitment_signed: commitment_msg,
1382                                                         },
1383                                                 });
1384                                         },
1385                                         None => {},
1386                                 }
1387                         },
1388                 }
1389         }
1390
1391         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
1392         /// generating message events for the net layer to claim the payment, if possible. Thus, you
1393         /// should probably kick the net layer to go send messages if this returns true!
1394         ///
1395         /// May panic if called except in response to a PaymentReceived event.
1396         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
1397                 let mut sha = Sha256::new();
1398                 sha.input(&payment_preimage);
1399                 let mut payment_hash = [0; 32];
1400                 sha.result(&mut payment_hash);
1401
1402                 let mut channel_state = Some(self.channel_state.lock().unwrap());
1403                 let removed_source = channel_state.as_mut().unwrap().claimable_htlcs.remove(&payment_hash);
1404                 if let Some(mut sources) = removed_source {
1405                         for htlc_with_hash in sources.drain(..) {
1406                                 if channel_state.is_none() { channel_state = Some(self.channel_state.lock().unwrap()); }
1407                                 self.claim_funds_internal(channel_state.take().unwrap(), HTLCSource::PreviousHopData(htlc_with_hash), payment_preimage);
1408                         }
1409                         true
1410                 } else { false }
1411         }
1412         fn claim_funds_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, source: HTLCSource, payment_preimage: [u8; 32]) {
1413                 match source {
1414                         HTLCSource::OutboundRoute { .. } => {
1415                                 mem::drop(channel_state);
1416                                 let mut pending_events = self.pending_events.lock().unwrap();
1417                                 pending_events.push(events::Event::PaymentSent {
1418                                         payment_preimage
1419                                 });
1420                         },
1421                         HTLCSource::PreviousHopData(HTLCPreviousHopData { short_channel_id, htlc_id, .. }) => {
1422                                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1423                                 let (node_id, fulfill_msgs) = {
1424                                         let chan_id = match channel_state.short_to_id.get(&short_channel_id) {
1425                                                 Some(chan_id) => chan_id.clone(),
1426                                                 None => {
1427                                                         // TODO: There is probably a channel manager somewhere that needs to
1428                                                         // learn the preimage as the channel already hit the chain and that's
1429                                                         // why its missing.
1430                                                         return
1431                                                 }
1432                                         };
1433
1434                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
1435                                         match chan.get_update_fulfill_htlc_and_commit(htlc_id, payment_preimage) {
1436                                                 Ok(msg) => (chan.get_their_node_id(), msg),
1437                                                 Err(_e) => {
1438                                                         // TODO: There is probably a channel manager somewhere that needs to
1439                                                         // learn the preimage as the channel may be about to hit the chain.
1440                                                         //TODO: Do something with e?
1441                                                         return
1442                                                 },
1443                                         }
1444                                 };
1445
1446                                 mem::drop(channel_state);
1447                                 if let Some(chan_monitor) = fulfill_msgs.1 {
1448                                         if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1449                                                 unimplemented!();// but def dont push the event...
1450                                         }
1451                                 }
1452
1453                                 if let Some((msg, commitment_msg)) = fulfill_msgs.0 {
1454                                         let mut pending_events = self.pending_events.lock().unwrap();
1455                                         pending_events.push(events::Event::UpdateHTLCs {
1456                                                 node_id: node_id,
1457                                                 updates: msgs::CommitmentUpdate {
1458                                                         update_add_htlcs: Vec::new(),
1459                                                         update_fulfill_htlcs: vec![msg],
1460                                                         update_fail_htlcs: Vec::new(),
1461                                                         update_fail_malformed_htlcs: Vec::new(),
1462                                                         update_fee: None,
1463                                                         commitment_signed: commitment_msg,
1464                                                 }
1465                                         });
1466                                 }
1467                         },
1468                 }
1469         }
1470
1471         /// Gets the node_id held by this ChannelManager
1472         pub fn get_our_node_id(&self) -> PublicKey {
1473                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key)
1474         }
1475
1476         /// Used to restore channels to normal operation after a
1477         /// ChannelMonitorUpdateErr::TemporaryFailure was returned from a channel monitor update
1478         /// operation.
1479         pub fn test_restore_channel_monitor(&self) {
1480                 unimplemented!();
1481         }
1482
1483         fn internal_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, MsgHandleErrInternal> {
1484                 if msg.chain_hash != self.genesis_hash {
1485                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Unknown genesis block hash", msg.temporary_channel_id.clone()));
1486                 }
1487                 let mut channel_state = self.channel_state.lock().unwrap();
1488                 if channel_state.by_id.contains_key(&msg.temporary_channel_id) {
1489                         return Err(MsgHandleErrInternal::send_err_msg_no_close("temporary_channel_id collision!", msg.temporary_channel_id.clone()));
1490                 }
1491
1492                 let chan_keys = if cfg!(feature = "fuzztarget") {
1493                         ChannelKeys {
1494                                 funding_key:               SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0]).unwrap(),
1495                                 revocation_base_key:       SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 2, 0]).unwrap(),
1496                                 payment_base_key:          SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0]).unwrap(),
1497                                 delayed_payment_base_key:  SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0]).unwrap(),
1498                                 htlc_base_key:             SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0]).unwrap(),
1499                                 channel_close_key:         SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0]).unwrap(),
1500                                 channel_monitor_claim_key: SecretKey::from_slice(&self.secp_ctx, &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 0]).unwrap(),
1501                                 commitment_seed: [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0],
1502                         }
1503                 } else {
1504                         let mut key_seed = [0u8; 32];
1505                         rng::fill_bytes(&mut key_seed);
1506                         match ChannelKeys::new_from_seed(&key_seed) {
1507                                 Ok(key) => key,
1508                                 Err(_) => panic!("RNG is busted!")
1509                         }
1510                 };
1511
1512                 let channel = Channel::new_from_req(&*self.fee_estimator, chan_keys, their_node_id.clone(), msg, 0, false, self.announce_channels_publicly, Arc::clone(&self.logger))
1513                         .map_err(|e| MsgHandleErrInternal::from_chan_no_close(e, msg.temporary_channel_id))?;
1514                 let accept_msg = channel.get_accept_channel();
1515                 channel_state.by_id.insert(channel.channel_id(), channel);
1516                 Ok(accept_msg)
1517         }
1518
1519         fn internal_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), MsgHandleErrInternal> {
1520                 let (value, output_script, user_id) = {
1521                         let mut channel_state = self.channel_state.lock().unwrap();
1522                         match channel_state.by_id.get_mut(&msg.temporary_channel_id) {
1523                                 Some(chan) => {
1524                                         if chan.get_their_node_id() != *their_node_id {
1525                                                 //TODO: see issue #153, need a consistent behavior on obnoxious behavior from random node
1526                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.temporary_channel_id));
1527                                         }
1528                                         chan.accept_channel(&msg)
1529                                                 .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.temporary_channel_id))?;
1530                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
1531                                 },
1532                                 //TODO: same as above
1533                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.temporary_channel_id))
1534                         }
1535                 };
1536                 let mut pending_events = self.pending_events.lock().unwrap();
1537                 pending_events.push(events::Event::FundingGenerationReady {
1538                         temporary_channel_id: msg.temporary_channel_id,
1539                         channel_value_satoshis: value,
1540                         output_script: output_script,
1541                         user_channel_id: user_id,
1542                 });
1543                 Ok(())
1544         }
1545
1546         fn internal_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, MsgHandleErrInternal> {
1547                 let (chan, funding_msg, monitor_update) = {
1548                         let mut channel_state = self.channel_state.lock().unwrap();
1549                         match channel_state.by_id.entry(msg.temporary_channel_id.clone()) {
1550                                 hash_map::Entry::Occupied(mut chan) => {
1551                                         if chan.get().get_their_node_id() != *their_node_id {
1552                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1553                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.temporary_channel_id));
1554                                         }
1555                                         match chan.get_mut().funding_created(msg) {
1556                                                 Ok((funding_msg, monitor_update)) => {
1557                                                         (chan.remove(), funding_msg, monitor_update)
1558                                                 },
1559                                                 Err(e) => {
1560                                                         return Err(e).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))
1561                                                 }
1562                                         }
1563                                 },
1564                                 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.temporary_channel_id))
1565                         }
1566                 }; // Release channel lock for install_watch_outpoint call,
1567                    // note that this means if the remote end is misbehaving and sends a message for the same
1568                    // channel back-to-back with funding_created, we'll end up thinking they sent a message
1569                    // for a bogus channel.
1570                 if let Err(_e) = self.monitor.add_update_monitor(monitor_update.get_funding_txo().unwrap(), monitor_update) {
1571                         unimplemented!();
1572                 }
1573                 let mut channel_state = self.channel_state.lock().unwrap();
1574                 match channel_state.by_id.entry(funding_msg.channel_id) {
1575                         hash_map::Entry::Occupied(_) => {
1576                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Already had channel with the new channel_id", funding_msg.channel_id))
1577                         },
1578                         hash_map::Entry::Vacant(e) => {
1579                                 e.insert(chan);
1580                         }
1581                 }
1582                 Ok(funding_msg)
1583         }
1584
1585         fn internal_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), MsgHandleErrInternal> {
1586                 let (funding_txo, user_id, monitor) = {
1587                         let mut channel_state = self.channel_state.lock().unwrap();
1588                         match channel_state.by_id.get_mut(&msg.channel_id) {
1589                                 Some(chan) => {
1590                                         if chan.get_their_node_id() != *their_node_id {
1591                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1592                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1593                                         }
1594                                         let chan_monitor = chan.funding_signed(&msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1595                                         (chan.get_funding_txo().unwrap(), chan.get_user_id(), chan_monitor)
1596                                 },
1597                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1598                         }
1599                 };
1600                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1601                         unimplemented!();
1602                 }
1603                 let mut pending_events = self.pending_events.lock().unwrap();
1604                 pending_events.push(events::Event::FundingBroadcastSafe {
1605                         funding_txo: funding_txo,
1606                         user_channel_id: user_id,
1607                 });
1608                 Ok(())
1609         }
1610
1611         fn internal_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, MsgHandleErrInternal> {
1612                 let mut channel_state = self.channel_state.lock().unwrap();
1613                 match channel_state.by_id.get_mut(&msg.channel_id) {
1614                         Some(chan) => {
1615                                 if chan.get_their_node_id() != *their_node_id {
1616                                         //TODO: here and below MsgHandleErrInternal, #153 case
1617                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1618                                 }
1619                                 chan.funding_locked(&msg)
1620                                         .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))?;
1621                                 return Ok(self.get_announcement_sigs(chan));
1622                         },
1623                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1624                 };
1625         }
1626
1627         fn internal_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), MsgHandleErrInternal> {
1628                 let (mut res, chan_option) = {
1629                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1630                         let channel_state = channel_state_lock.borrow_parts();
1631
1632                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1633                                 hash_map::Entry::Occupied(mut chan_entry) => {
1634                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1635                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1636                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1637                                         }
1638                                         let res = chan_entry.get_mut().shutdown(&*self.fee_estimator, &msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1639                                         if chan_entry.get().is_shutdown() {
1640                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1641                                                         channel_state.short_to_id.remove(&short_id);
1642                                                 }
1643                                                 (res, Some(chan_entry.remove_entry().1))
1644                                         } else { (res, None) }
1645                                 },
1646                                 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1647                         }
1648                 };
1649                 for htlc_source in res.2.drain(..) {
1650                         // unknown_next_peer...I dunno who that is anymore....
1651                         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() });
1652                 }
1653                 if let Some(chan) = chan_option {
1654                         if let Ok(update) = self.get_channel_update(&chan) {
1655                                 let mut events = self.pending_events.lock().unwrap();
1656                                 events.push(events::Event::BroadcastChannelUpdate {
1657                                         msg: update
1658                                 });
1659                         }
1660                 }
1661                 Ok((res.0, res.1))
1662         }
1663
1664         fn internal_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, MsgHandleErrInternal> {
1665                 let (res, chan_option) = {
1666                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1667                         let channel_state = channel_state_lock.borrow_parts();
1668                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1669                                 hash_map::Entry::Occupied(mut chan_entry) => {
1670                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1671                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1672                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1673                                         }
1674                                         let res = chan_entry.get_mut().closing_signed(&*self.fee_estimator, &msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?;
1675                                         if res.1.is_some() {
1676                                                 // We're done with this channel, we've got a signed closing transaction and
1677                                                 // will send the closing_signed back to the remote peer upon return. This
1678                                                 // also implies there are no pending HTLCs left on the channel, so we can
1679                                                 // fully delete it from tracking (the channel monitor is still around to
1680                                                 // watch for old state broadcasts)!
1681                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1682                                                         channel_state.short_to_id.remove(&short_id);
1683                                                 }
1684                                                 (res, Some(chan_entry.remove_entry().1))
1685                                         } else { (res, None) }
1686                                 },
1687                                 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1688                         }
1689                 };
1690                 if let Some(broadcast_tx) = res.1 {
1691                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1692                 }
1693                 if let Some(chan) = chan_option {
1694                         if let Ok(update) = self.get_channel_update(&chan) {
1695                                 let mut events = self.pending_events.lock().unwrap();
1696                                 events.push(events::Event::BroadcastChannelUpdate {
1697                                         msg: update
1698                                 });
1699                         }
1700                 }
1701                 Ok(res.0)
1702         }
1703
1704         fn internal_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), MsgHandleErrInternal> {
1705                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
1706                 //determine the state of the payment based on our response/if we forward anything/the time
1707                 //we take to respond. We should take care to avoid allowing such an attack.
1708                 //
1709                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
1710                 //us repeatedly garbled in different ways, and compare our error messages, which are
1711                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
1712                 //but we should prevent it anyway.
1713
1714                 let (pending_forward_info, mut channel_state_lock) = self.decode_update_add_htlc_onion(msg);
1715                 let channel_state = channel_state_lock.borrow_parts();
1716
1717                 match channel_state.by_id.get_mut(&msg.channel_id) {
1718                         Some(chan) => {
1719                                 if chan.get_their_node_id() != *their_node_id {
1720                                         //TODO: here MsgHandleErrInternal, #153 case
1721                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1722                                 }
1723                                 if !chan.is_usable() {
1724                                         return Err(MsgHandleErrInternal::from_no_close(HandleError{err: "Channel not yet available for receiving HTLCs", action: Some(msgs::ErrorAction::IgnoreError)}));
1725                                 }
1726                                 chan.update_add_htlc(&msg, pending_forward_info).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))
1727                         },
1728                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1729                 }
1730         }
1731
1732         fn internal_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), MsgHandleErrInternal> {
1733                 let mut channel_state = self.channel_state.lock().unwrap();
1734                 let htlc_source = match channel_state.by_id.get_mut(&msg.channel_id) {
1735                         Some(chan) => {
1736                                 if chan.get_their_node_id() != *their_node_id {
1737                                         //TODO: here and below MsgHandleErrInternal, #153 case
1738                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1739                                 }
1740                                 chan.update_fulfill_htlc(&msg)
1741                                         .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))?.clone()
1742                         },
1743                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1744                 };
1745                 self.claim_funds_internal(channel_state, htlc_source, msg.payment_preimage.clone());
1746                 Ok(())
1747         }
1748
1749         fn internal_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<msgs::HTLCFailChannelUpdate>, MsgHandleErrInternal> {
1750                 let mut channel_state = self.channel_state.lock().unwrap();
1751                 let htlc_source = match channel_state.by_id.get_mut(&msg.channel_id) {
1752                         Some(chan) => {
1753                                 if chan.get_their_node_id() != *their_node_id {
1754                                         //TODO: here and below MsgHandleErrInternal, #153 case
1755                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1756                                 }
1757                                 chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() })
1758                                         .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))
1759                         },
1760                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1761                 }?;
1762
1763                 match htlc_source {
1764                         &HTLCSource::OutboundRoute { ref route, ref session_priv, .. } => {
1765                                 // Handle packed channel/node updates for passing back for the route handler
1766                                 let mut packet_decrypted = msg.reason.data.clone();
1767                                 let mut res = None;
1768                                 Self::construct_onion_keys_callback(&self.secp_ctx, &route, &session_priv, |shared_secret, _, _, route_hop| {
1769                                         if res.is_some() { return; }
1770
1771                                         let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
1772
1773                                         let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len());
1774                                         decryption_tmp.resize(packet_decrypted.len(), 0);
1775                                         let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
1776                                         chacha.process(&packet_decrypted, &mut decryption_tmp[..]);
1777                                         packet_decrypted = decryption_tmp;
1778
1779                                         if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::read(&mut Cursor::new(&packet_decrypted)) {
1780                                                 if err_packet.failuremsg.len() >= 2 {
1781                                                         let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
1782
1783                                                         let mut hmac = Hmac::new(Sha256::new(), &um);
1784                                                         hmac.input(&err_packet.encode()[32..]);
1785                                                         let mut calc_tag = [0u8; 32];
1786                                                         hmac.raw_result(&mut calc_tag);
1787                                                         if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) {
1788                                                                 const UNKNOWN_CHAN: u16 = 0x4000|10;
1789                                                                 const TEMP_CHAN_FAILURE: u16 = 0x4000|7;
1790                                                                 match byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]) {
1791                                                                         TEMP_CHAN_FAILURE => {
1792                                                                                 if err_packet.failuremsg.len() >= 4 {
1793                                                                                         let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[2..4]) as usize;
1794                                                                                         if err_packet.failuremsg.len() >= 4 + update_len {
1795                                                                                                 if let Ok(chan_update) = msgs::ChannelUpdate::read(&mut Cursor::new(&err_packet.failuremsg[4..4 + update_len])) {
1796                                                                                                         res = Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage {
1797                                                                                                                 msg: chan_update,
1798                                                                                                         });
1799                                                                                                 }
1800                                                                                         }
1801                                                                                 }
1802                                                                         },
1803                                                                         UNKNOWN_CHAN => {
1804                                                                                 // No such next-hop. We know this came from the
1805                                                                                 // current node as the HMAC validated.
1806                                                                                 res = Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
1807                                                                                         short_channel_id: route_hop.short_channel_id
1808                                                                                 });
1809                                                                         },
1810                                                                         _ => {}, //TODO: Enumerate all of these!
1811                                                                 }
1812                                                         }
1813                                                 }
1814                                         }
1815                                 }).unwrap();
1816                                 Ok(res)
1817                         },
1818                         _ => { Ok(None) },
1819                 }
1820         }
1821
1822         fn internal_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), MsgHandleErrInternal> {
1823                 let mut channel_state = self.channel_state.lock().unwrap();
1824                 match channel_state.by_id.get_mut(&msg.channel_id) {
1825                         Some(chan) => {
1826                                 if chan.get_their_node_id() != *their_node_id {
1827                                         //TODO: here and below MsgHandleErrInternal, #153 case
1828                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1829                                 }
1830                                 if (msg.failure_code & 0x8000) != 0 {
1831                                         return Err(MsgHandleErrInternal::send_err_msg_close_chan("Got update_fail_malformed_htlc with BADONION set", msg.channel_id));
1832                                 }
1833                                 chan.update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() })
1834                                         .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))?;
1835                                 Ok(())
1836                         },
1837                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1838                 }
1839         }
1840
1841         fn internal_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), MsgHandleErrInternal> {
1842                 let (revoke_and_ack, commitment_signed, chan_monitor) = {
1843                         let mut channel_state = self.channel_state.lock().unwrap();
1844                         match channel_state.by_id.get_mut(&msg.channel_id) {
1845                                 Some(chan) => {
1846                                         if chan.get_their_node_id() != *their_node_id {
1847                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1848                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1849                                         }
1850                                         chan.commitment_signed(&msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?
1851                                 },
1852                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1853                         }
1854                 };
1855                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1856                         unimplemented!();
1857                 }
1858
1859                 Ok((revoke_and_ack, commitment_signed))
1860         }
1861
1862         fn internal_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, MsgHandleErrInternal> {
1863                 let ((res, mut pending_forwards, mut pending_failures, chan_monitor), short_channel_id) = {
1864                         let mut channel_state = self.channel_state.lock().unwrap();
1865                         match channel_state.by_id.get_mut(&msg.channel_id) {
1866                                 Some(chan) => {
1867                                         if chan.get_their_node_id() != *their_node_id {
1868                                                 //TODO: here and below MsgHandleErrInternal, #153 case
1869                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1870                                         }
1871                                         (chan.revoke_and_ack(&msg).map_err(|e| MsgHandleErrInternal::from_maybe_close(e))?, chan.get_short_channel_id().expect("RAA should only work on a short-id-available channel"))
1872                                 },
1873                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1874                         }
1875                 };
1876                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1877                         unimplemented!();
1878                 }
1879                 for failure in pending_failures.drain(..) {
1880                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), failure.0, &failure.1, failure.2);
1881                 }
1882
1883                 let mut forward_event = None;
1884                 if !pending_forwards.is_empty() {
1885                         let mut channel_state = self.channel_state.lock().unwrap();
1886                         if channel_state.forward_htlcs.is_empty() {
1887                                 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));
1888                                 channel_state.next_forward = forward_event.unwrap();
1889                         }
1890                         for (forward_info, prev_htlc_id) in pending_forwards.drain(..) {
1891                                 match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
1892                                         hash_map::Entry::Occupied(mut entry) => {
1893                                                 entry.get_mut().push(HTLCForwardInfo { prev_short_channel_id: short_channel_id, prev_htlc_id, forward_info });
1894                                         },
1895                                         hash_map::Entry::Vacant(entry) => {
1896                                                 entry.insert(vec!(HTLCForwardInfo { prev_short_channel_id: short_channel_id, prev_htlc_id, forward_info }));
1897                                         }
1898                                 }
1899                         }
1900                 }
1901                 match forward_event {
1902                         Some(time) => {
1903                                 let mut pending_events = self.pending_events.lock().unwrap();
1904                                 pending_events.push(events::Event::PendingHTLCsForwardable {
1905                                         time_forwardable: time
1906                                 });
1907                         }
1908                         None => {},
1909                 }
1910
1911                 Ok(res)
1912         }
1913
1914         fn internal_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), MsgHandleErrInternal> {
1915                 let mut channel_state = self.channel_state.lock().unwrap();
1916                 match channel_state.by_id.get_mut(&msg.channel_id) {
1917                         Some(chan) => {
1918                                 if chan.get_their_node_id() != *their_node_id {
1919                                         //TODO: here and below MsgHandleErrInternal, #153 case
1920                                         return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1921                                 }
1922                                 chan.update_fee(&*self.fee_estimator, &msg).map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))
1923                         },
1924                         None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1925                 }
1926         }
1927
1928         fn internal_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), MsgHandleErrInternal> {
1929                 let (chan_announcement, chan_update) = {
1930                         let mut channel_state = self.channel_state.lock().unwrap();
1931                         match channel_state.by_id.get_mut(&msg.channel_id) {
1932                                 Some(chan) => {
1933                                         if chan.get_their_node_id() != *their_node_id {
1934                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1935                                         }
1936                                         if !chan.is_usable() {
1937                                                 return Err(MsgHandleErrInternal::from_no_close(HandleError{err: "Got an announcement_signatures before we were ready for it", action: Some(msgs::ErrorAction::IgnoreError)}));
1938                                         }
1939
1940                                         let our_node_id = self.get_our_node_id();
1941                                         let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())
1942                                                 .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))?;
1943
1944                                         let were_node_one = announcement.node_id_1 == our_node_id;
1945                                         let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1946                                         let bad_sig_action = MsgHandleErrInternal::send_err_msg_close_chan("Bad announcement_signatures node_signature", msg.channel_id);
1947                                         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);
1948                                         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);
1949
1950                                         let our_node_sig = self.secp_ctx.sign(&msghash, &self.our_network_key);
1951
1952                                         (msgs::ChannelAnnouncement {
1953                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
1954                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
1955                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
1956                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
1957                                                 contents: announcement,
1958                                         }, self.get_channel_update(chan).unwrap()) // can only fail if we're not in a ready state
1959                                 },
1960                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1961                         }
1962                 };
1963                 let mut pending_events = self.pending_events.lock().unwrap();
1964                 pending_events.push(events::Event::BroadcastChannelAnnouncement { msg: chan_announcement, update_msg: chan_update });
1965                 Ok(())
1966         }
1967
1968         fn internal_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) -> Result<(Option<msgs::FundingLocked>, Option<msgs::RevokeAndACK>, Option<msgs::CommitmentUpdate>), MsgHandleErrInternal> {
1969                 let (res, chan_monitor) = {
1970                         let mut channel_state = self.channel_state.lock().unwrap();
1971                         match channel_state.by_id.get_mut(&msg.channel_id) {
1972                                 Some(chan) => {
1973                                         if chan.get_their_node_id() != *their_node_id {
1974                                                 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
1975                                         }
1976                                         let (funding_locked, revoke_and_ack, commitment_update, channel_monitor) = chan.channel_reestablish(msg)
1977                                                 .map_err(|e| MsgHandleErrInternal::from_chan_maybe_close(e, msg.channel_id))?;
1978                                         (Ok((funding_locked, revoke_and_ack, commitment_update)), channel_monitor)
1979                                 },
1980                                 None => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
1981                         }
1982                 };
1983                 if let Some(monitor) = chan_monitor {
1984                         if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1985                                 unimplemented!();
1986                         }
1987                 }
1988                 res
1989         }
1990
1991         /// Begin Update fee process. Allowed only on an outbound channel.
1992         /// If successful, will generate a UpdateHTLCs event, so you should probably poll
1993         /// PeerManager::process_events afterwards.
1994         /// Note: This API is likely to change!
1995         #[doc(hidden)]
1996         pub fn update_fee(&self, channel_id: [u8;32], feerate_per_kw: u64) -> Result<(), APIError> {
1997                 let mut channel_state = self.channel_state.lock().unwrap();
1998                 match channel_state.by_id.get_mut(&channel_id) {
1999                         None => return Err(APIError::APIMisuseError{err: "Failed to find corresponding channel"}),
2000                         Some(chan) => {
2001                                 if !chan.is_usable() {
2002                                         return Err(APIError::APIMisuseError{err: "Channel is not in usuable state"});
2003                                 }
2004                                 if !chan.is_outbound() {
2005                                         return Err(APIError::APIMisuseError{err: "update_fee cannot be sent for an inbound channel"});
2006                                 }
2007                                 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})? {
2008                                         if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
2009                                                 unimplemented!();
2010                                         }
2011                                         let mut pending_events = self.pending_events.lock().unwrap();
2012                                         pending_events.push(events::Event::UpdateHTLCs {
2013                                                 node_id: chan.get_their_node_id(),
2014                                                 updates: msgs::CommitmentUpdate {
2015                                                         update_add_htlcs: Vec::new(),
2016                                                         update_fulfill_htlcs: Vec::new(),
2017                                                         update_fail_htlcs: Vec::new(),
2018                                                         update_fail_malformed_htlcs: Vec::new(),
2019                                                         update_fee: Some(update_fee),
2020                                                         commitment_signed,
2021                                                 },
2022                                         });
2023                                 }
2024                         },
2025                 }
2026                 Ok(())
2027         }
2028 }
2029
2030 impl events::EventsProvider for ChannelManager {
2031         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
2032                 let mut pending_events = self.pending_events.lock().unwrap();
2033                 let mut ret = Vec::new();
2034                 mem::swap(&mut ret, &mut *pending_events);
2035                 ret
2036         }
2037 }
2038
2039 impl ChainListener for ChannelManager {
2040         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
2041                 let mut new_events = Vec::new();
2042                 let mut failed_channels = Vec::new();
2043                 {
2044                         let mut channel_lock = self.channel_state.lock().unwrap();
2045                         let channel_state = channel_lock.borrow_parts();
2046                         let short_to_id = channel_state.short_to_id;
2047                         channel_state.by_id.retain(|_, channel| {
2048                                 let chan_res = channel.block_connected(header, height, txn_matched, indexes_of_txn_matched);
2049                                 if let Ok(Some(funding_locked)) = chan_res {
2050                                         let announcement_sigs = self.get_announcement_sigs(channel);
2051                                         new_events.push(events::Event::SendFundingLocked {
2052                                                 node_id: channel.get_their_node_id(),
2053                                                 msg: funding_locked,
2054                                                 announcement_sigs: announcement_sigs
2055                                         });
2056                                         short_to_id.insert(channel.get_short_channel_id().unwrap(), channel.channel_id());
2057                                 } else if let Err(e) = chan_res {
2058                                         new_events.push(events::Event::HandleError {
2059                                                 node_id: channel.get_their_node_id(),
2060                                                 action: e.action,
2061                                         });
2062                                         if channel.is_shutdown() {
2063                                                 return false;
2064                                         }
2065                                 }
2066                                 if let Some(funding_txo) = channel.get_funding_txo() {
2067                                         for tx in txn_matched {
2068                                                 for inp in tx.input.iter() {
2069                                                         if inp.previous_output == funding_txo.into_bitcoin_outpoint() {
2070                                                                 if let Some(short_id) = channel.get_short_channel_id() {
2071                                                                         short_to_id.remove(&short_id);
2072                                                                 }
2073                                                                 // It looks like our counterparty went on-chain. We go ahead and
2074                                                                 // broadcast our latest local state as well here, just in case its
2075                                                                 // some kind of SPV attack, though we expect these to be dropped.
2076                                                                 failed_channels.push(channel.force_shutdown());
2077                                                                 if let Ok(update) = self.get_channel_update(&channel) {
2078                                                                         new_events.push(events::Event::BroadcastChannelUpdate {
2079                                                                                 msg: update
2080                                                                         });
2081                                                                 }
2082                                                                 return false;
2083                                                         }
2084                                                 }
2085                                         }
2086                                 }
2087                                 if channel.is_funding_initiated() && channel.channel_monitor().would_broadcast_at_height(height) {
2088                                         if let Some(short_id) = channel.get_short_channel_id() {
2089                                                 short_to_id.remove(&short_id);
2090                                         }
2091                                         failed_channels.push(channel.force_shutdown());
2092                                         // If would_broadcast_at_height() is true, the channel_monitor will broadcast
2093                                         // the latest local tx for us, so we should skip that here (it doesn't really
2094                                         // hurt anything, but does make tests a bit simpler).
2095                                         failed_channels.last_mut().unwrap().0 = Vec::new();
2096                                         if let Ok(update) = self.get_channel_update(&channel) {
2097                                                 new_events.push(events::Event::BroadcastChannelUpdate {
2098                                                         msg: update
2099                                                 });
2100                                         }
2101                                         return false;
2102                                 }
2103                                 true
2104                         });
2105                 }
2106                 for failure in failed_channels.drain(..) {
2107                         self.finish_force_close_channel(failure);
2108                 }
2109                 let mut pending_events = self.pending_events.lock().unwrap();
2110                 for funding_locked in new_events.drain(..) {
2111                         pending_events.push(funding_locked);
2112                 }
2113                 self.latest_block_height.store(height as usize, Ordering::Release);
2114         }
2115
2116         /// We force-close the channel without letting our counterparty participate in the shutdown
2117         fn block_disconnected(&self, header: &BlockHeader) {
2118                 let mut new_events = Vec::new();
2119                 let mut failed_channels = Vec::new();
2120                 {
2121                         let mut channel_lock = self.channel_state.lock().unwrap();
2122                         let channel_state = channel_lock.borrow_parts();
2123                         let short_to_id = channel_state.short_to_id;
2124                         channel_state.by_id.retain(|_,  v| {
2125                                 if v.block_disconnected(header) {
2126                                         if let Some(short_id) = v.get_short_channel_id() {
2127                                                 short_to_id.remove(&short_id);
2128                                         }
2129                                         failed_channels.push(v.force_shutdown());
2130                                         if let Ok(update) = self.get_channel_update(&v) {
2131                                                 new_events.push(events::Event::BroadcastChannelUpdate {
2132                                                         msg: update
2133                                                 });
2134                                         }
2135                                         false
2136                                 } else {
2137                                         true
2138                                 }
2139                         });
2140                 }
2141                 for failure in failed_channels.drain(..) {
2142                         self.finish_force_close_channel(failure);
2143                 }
2144                 if !new_events.is_empty() {
2145                         let mut pending_events = self.pending_events.lock().unwrap();
2146                         for funding_locked in new_events.drain(..) {
2147                                 pending_events.push(funding_locked);
2148                         }
2149                 }
2150                 self.latest_block_height.fetch_sub(1, Ordering::AcqRel);
2151         }
2152 }
2153
2154 macro_rules! handle_error {
2155         ($self: ident, $internal: expr, $their_node_id: expr) => {
2156                 match $internal {
2157                         Ok(msg) => Ok(msg),
2158                         Err(MsgHandleErrInternal { err, needs_channel_force_close }) => {
2159                                 if needs_channel_force_close {
2160                                         match &err.action {
2161                                                 &Some(msgs::ErrorAction::DisconnectPeer { msg: Some(ref msg) }) => {
2162                                                         if msg.channel_id == [0; 32] {
2163                                                                 $self.peer_disconnected(&$their_node_id, true);
2164                                                         } else {
2165                                                                 $self.force_close_channel(&msg.channel_id);
2166                                                         }
2167                                                 },
2168                                                 &Some(msgs::ErrorAction::DisconnectPeer { msg: None }) => {},
2169                                                 &Some(msgs::ErrorAction::IgnoreError) => {},
2170                                                 &Some(msgs::ErrorAction::SendErrorMessage { ref msg }) => {
2171                                                         if msg.channel_id == [0; 32] {
2172                                                                 $self.peer_disconnected(&$their_node_id, true);
2173                                                         } else {
2174                                                                 $self.force_close_channel(&msg.channel_id);
2175                                                         }
2176                                                 },
2177                                                 &None => {},
2178                                         }
2179                                 }
2180                                 Err(err)
2181                         },
2182                 }
2183         }
2184 }
2185
2186 impl ChannelMessageHandler for ChannelManager {
2187         //TODO: Handle errors and close channel (or so)
2188         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, HandleError> {
2189                 handle_error!(self, self.internal_open_channel(their_node_id, msg), their_node_id)
2190         }
2191
2192         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
2193                 handle_error!(self, self.internal_accept_channel(their_node_id, msg), their_node_id)
2194         }
2195
2196         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
2197                 handle_error!(self, self.internal_funding_created(their_node_id, msg), their_node_id)
2198         }
2199
2200         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
2201                 handle_error!(self, self.internal_funding_signed(their_node_id, msg), their_node_id)
2202         }
2203
2204         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
2205                 handle_error!(self, self.internal_funding_locked(their_node_id, msg), their_node_id)
2206         }
2207
2208         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), HandleError> {
2209                 handle_error!(self, self.internal_shutdown(their_node_id, msg), their_node_id)
2210         }
2211
2212         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, HandleError> {
2213                 handle_error!(self, self.internal_closing_signed(their_node_id, msg), their_node_id)
2214         }
2215
2216         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
2217                 handle_error!(self, self.internal_update_add_htlc(their_node_id, msg), their_node_id)
2218         }
2219
2220         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
2221                 handle_error!(self, self.internal_update_fulfill_htlc(their_node_id, msg), their_node_id)
2222         }
2223
2224         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<msgs::HTLCFailChannelUpdate>, HandleError> {
2225                 handle_error!(self, self.internal_update_fail_htlc(their_node_id, msg), their_node_id)
2226         }
2227
2228         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> {
2229                 handle_error!(self, self.internal_update_fail_malformed_htlc(their_node_id, msg), their_node_id)
2230         }
2231
2232         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), HandleError> {
2233                 handle_error!(self, self.internal_commitment_signed(their_node_id, msg), their_node_id)
2234         }
2235
2236         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, HandleError> {
2237                 handle_error!(self, self.internal_revoke_and_ack(their_node_id, msg), their_node_id)
2238         }
2239
2240         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
2241                 handle_error!(self, self.internal_update_fee(their_node_id, msg), their_node_id)
2242         }
2243
2244         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
2245                 handle_error!(self, self.internal_announcement_signatures(their_node_id, msg), their_node_id)
2246         }
2247
2248         fn handle_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) -> Result<(Option<msgs::FundingLocked>, Option<msgs::RevokeAndACK>, Option<msgs::CommitmentUpdate>), HandleError> {
2249                 handle_error!(self, self.internal_channel_reestablish(their_node_id, msg), their_node_id)
2250         }
2251
2252         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
2253                 let mut new_events = Vec::new();
2254                 let mut failed_channels = Vec::new();
2255                 let mut failed_payments = Vec::new();
2256                 {
2257                         let mut channel_state_lock = self.channel_state.lock().unwrap();
2258                         let channel_state = channel_state_lock.borrow_parts();
2259                         let short_to_id = channel_state.short_to_id;
2260                         if no_connection_possible {
2261                                 channel_state.by_id.retain(|_, chan| {
2262                                         if chan.get_their_node_id() == *their_node_id {
2263                                                 if let Some(short_id) = chan.get_short_channel_id() {
2264                                                         short_to_id.remove(&short_id);
2265                                                 }
2266                                                 failed_channels.push(chan.force_shutdown());
2267                                                 if let Ok(update) = self.get_channel_update(&chan) {
2268                                                         new_events.push(events::Event::BroadcastChannelUpdate {
2269                                                                 msg: update
2270                                                         });
2271                                                 }
2272                                                 false
2273                                         } else {
2274                                                 true
2275                                         }
2276                                 });
2277                         } else {
2278                                 channel_state.by_id.retain(|_, chan| {
2279                                         if chan.get_their_node_id() == *their_node_id {
2280                                                 //TODO: mark channel disabled (and maybe announce such after a timeout).
2281                                                 let failed_adds = chan.remove_uncommitted_htlcs_and_mark_paused();
2282                                                 if !failed_adds.is_empty() {
2283                                                         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
2284                                                         failed_payments.push((chan_update, failed_adds));
2285                                                 }
2286                                                 if chan.is_shutdown() {
2287                                                         if let Some(short_id) = chan.get_short_channel_id() {
2288                                                                 short_to_id.remove(&short_id);
2289                                                         }
2290                                                         return false;
2291                                                 }
2292                                         }
2293                                         true
2294                                 })
2295                         }
2296                 }
2297                 for failure in failed_channels.drain(..) {
2298                         self.finish_force_close_channel(failure);
2299                 }
2300                 if !new_events.is_empty() {
2301                         let mut pending_events = self.pending_events.lock().unwrap();
2302                         for event in new_events.drain(..) {
2303                                 pending_events.push(event);
2304                         }
2305                 }
2306                 for (chan_update, mut htlc_sources) in failed_payments {
2307                         for (htlc_source, payment_hash) in htlc_sources.drain(..) {
2308                                 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source, &payment_hash, HTLCFailReason::Reason { failure_code: 0x1000 | 7, data: chan_update.clone() });
2309                         }
2310                 }
2311         }
2312
2313         fn peer_connected(&self, their_node_id: &PublicKey) -> Vec<msgs::ChannelReestablish> {
2314                 let mut res = Vec::new();
2315                 let mut channel_state = self.channel_state.lock().unwrap();
2316                 channel_state.by_id.retain(|_, chan| {
2317                         if chan.get_their_node_id() == *their_node_id {
2318                                 if !chan.have_received_message() {
2319                                         // If we created this (outbound) channel while we were disconnected from the
2320                                         // peer we probably failed to send the open_channel message, which is now
2321                                         // lost. We can't have had anything pending related to this channel, so we just
2322                                         // drop it.
2323                                         false
2324                                 } else {
2325                                         res.push(chan.get_channel_reestablish());
2326                                         true
2327                                 }
2328                         } else { true }
2329                 });
2330                 //TODO: Also re-broadcast announcement_signatures
2331                 res
2332         }
2333
2334         fn handle_error(&self, their_node_id: &PublicKey, msg: &msgs::ErrorMessage) {
2335                 if msg.channel_id == [0; 32] {
2336                         for chan in self.list_channels() {
2337                                 if chan.remote_network_id == *their_node_id {
2338                                         self.force_close_channel(&chan.channel_id);
2339                                 }
2340                         }
2341                 } else {
2342                         self.force_close_channel(&msg.channel_id);
2343                 }
2344         }
2345 }
2346
2347 #[cfg(test)]
2348 mod tests {
2349         use chain::chaininterface;
2350         use chain::transaction::OutPoint;
2351         use chain::chaininterface::ChainListener;
2352         use ln::channelmanager::{ChannelManager,OnionKeys};
2353         use ln::router::{Route, RouteHop, Router};
2354         use ln::msgs;
2355         use ln::msgs::{ChannelMessageHandler,RoutingMessageHandler};
2356         use util::test_utils;
2357         use util::events::{Event, EventsProvider};
2358         use util::errors::APIError;
2359         use util::logger::Logger;
2360         use util::ser::Writeable;
2361
2362         use bitcoin::util::hash::Sha256dHash;
2363         use bitcoin::blockdata::block::{Block, BlockHeader};
2364         use bitcoin::blockdata::transaction::{Transaction, TxOut};
2365         use bitcoin::blockdata::constants::genesis_block;
2366         use bitcoin::network::constants::Network;
2367         use bitcoin::network::serialize::serialize;
2368         use bitcoin::network::serialize::BitcoinHash;
2369
2370         use hex;
2371
2372         use secp256k1::{Secp256k1, Message};
2373         use secp256k1::key::{PublicKey,SecretKey};
2374
2375         use crypto::sha2::Sha256;
2376         use crypto::digest::Digest;
2377
2378         use rand::{thread_rng,Rng};
2379
2380         use std::cell::RefCell;
2381         use std::collections::{BTreeSet, HashMap};
2382         use std::default::Default;
2383         use std::rc::Rc;
2384         use std::sync::{Arc, Mutex};
2385         use std::time::Instant;
2386         use std::mem;
2387
2388         fn build_test_onion_keys() -> Vec<OnionKeys> {
2389                 // Keys from BOLT 4, used in both test vector tests
2390                 let secp_ctx = Secp256k1::new();
2391
2392                 let route = Route {
2393                         hops: vec!(
2394                                         RouteHop {
2395                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
2396                                                 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
2397                                         },
2398                                         RouteHop {
2399                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
2400                                                 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
2401                                         },
2402                                         RouteHop {
2403                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
2404                                                 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
2405                                         },
2406                                         RouteHop {
2407                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
2408                                                 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
2409                                         },
2410                                         RouteHop {
2411                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
2412                                                 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
2413                                         },
2414                         ),
2415                 };
2416
2417                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex::decode("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
2418
2419                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
2420                 assert_eq!(onion_keys.len(), route.hops.len());
2421                 onion_keys
2422         }
2423
2424         #[test]
2425         fn onion_vectors() {
2426                 // Packet creation test vectors from BOLT 4
2427                 let onion_keys = build_test_onion_keys();
2428
2429                 assert_eq!(onion_keys[0].shared_secret[..], hex::decode("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
2430                 assert_eq!(onion_keys[0].blinding_factor[..], hex::decode("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
2431                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
2432                 assert_eq!(onion_keys[0].rho, hex::decode("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
2433                 assert_eq!(onion_keys[0].mu, hex::decode("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
2434
2435                 assert_eq!(onion_keys[1].shared_secret[..], hex::decode("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
2436                 assert_eq!(onion_keys[1].blinding_factor[..], hex::decode("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
2437                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex::decode("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
2438                 assert_eq!(onion_keys[1].rho, hex::decode("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
2439                 assert_eq!(onion_keys[1].mu, hex::decode("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
2440
2441                 assert_eq!(onion_keys[2].shared_secret[..], hex::decode("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
2442                 assert_eq!(onion_keys[2].blinding_factor[..], hex::decode("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
2443                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex::decode("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
2444                 assert_eq!(onion_keys[2].rho, hex::decode("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
2445                 assert_eq!(onion_keys[2].mu, hex::decode("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
2446
2447                 assert_eq!(onion_keys[3].shared_secret[..], hex::decode("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
2448                 assert_eq!(onion_keys[3].blinding_factor[..], hex::decode("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
2449                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex::decode("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
2450                 assert_eq!(onion_keys[3].rho, hex::decode("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
2451                 assert_eq!(onion_keys[3].mu, hex::decode("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
2452
2453                 assert_eq!(onion_keys[4].shared_secret[..], hex::decode("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
2454                 assert_eq!(onion_keys[4].blinding_factor[..], hex::decode("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
2455                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex::decode("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
2456                 assert_eq!(onion_keys[4].rho, hex::decode("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
2457                 assert_eq!(onion_keys[4].mu, hex::decode("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
2458
2459                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
2460                 let payloads = vec!(
2461                         msgs::OnionHopData {
2462                                 realm: 0,
2463                                 data: msgs::OnionRealm0HopData {
2464                                         short_channel_id: 0,
2465                                         amt_to_forward: 0,
2466                                         outgoing_cltv_value: 0,
2467                                 },
2468                                 hmac: [0; 32],
2469                         },
2470                         msgs::OnionHopData {
2471                                 realm: 0,
2472                                 data: msgs::OnionRealm0HopData {
2473                                         short_channel_id: 0x0101010101010101,
2474                                         amt_to_forward: 0x0100000001,
2475                                         outgoing_cltv_value: 0,
2476                                 },
2477                                 hmac: [0; 32],
2478                         },
2479                         msgs::OnionHopData {
2480                                 realm: 0,
2481                                 data: msgs::OnionRealm0HopData {
2482                                         short_channel_id: 0x0202020202020202,
2483                                         amt_to_forward: 0x0200000002,
2484                                         outgoing_cltv_value: 0,
2485                                 },
2486                                 hmac: [0; 32],
2487                         },
2488                         msgs::OnionHopData {
2489                                 realm: 0,
2490                                 data: msgs::OnionRealm0HopData {
2491                                         short_channel_id: 0x0303030303030303,
2492                                         amt_to_forward: 0x0300000003,
2493                                         outgoing_cltv_value: 0,
2494                                 },
2495                                 hmac: [0; 32],
2496                         },
2497                         msgs::OnionHopData {
2498                                 realm: 0,
2499                                 data: msgs::OnionRealm0HopData {
2500                                         short_channel_id: 0x0404040404040404,
2501                                         amt_to_forward: 0x0400000004,
2502                                         outgoing_cltv_value: 0,
2503                                 },
2504                                 hmac: [0; 32],
2505                         },
2506                 );
2507
2508                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, &[0x42; 32]);
2509                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
2510                 // anyway...
2511                 assert_eq!(packet.encode(), hex::decode("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").unwrap());
2512         }
2513
2514         #[test]
2515         fn test_failure_packet_onion() {
2516                 // Returning Errors test vectors from BOLT 4
2517
2518                 let onion_keys = build_test_onion_keys();
2519                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret, 0x2002, &[0; 0]);
2520                 assert_eq!(onion_error.encode(), hex::decode("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").unwrap());
2521
2522                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret, &onion_error.encode()[..]);
2523                 assert_eq!(onion_packet_1.data, hex::decode("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").unwrap());
2524
2525                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret, &onion_packet_1.data[..]);
2526                 assert_eq!(onion_packet_2.data, hex::decode("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").unwrap());
2527
2528                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret, &onion_packet_2.data[..]);
2529                 assert_eq!(onion_packet_3.data, hex::decode("a5d3e8634cfe78b2307d87c6d90be6fe7855b4f2cc9b1dfb19e92e4b79103f61ff9ac25f412ddfb7466e74f81b3e545563cdd8f5524dae873de61d7bdfccd496af2584930d2b566b4f8d3881f8c043df92224f38cf094cfc09d92655989531524593ec6d6caec1863bdfaa79229b5020acc034cd6deeea1021c50586947b9b8e6faa83b81fbfa6133c0af5d6b07c017f7158fa94f0d206baf12dda6b68f785b773b360fd0497e16cc402d779c8d48d0fa6315536ef0660f3f4e1865f5b38ea49c7da4fd959de4e83ff3ab686f059a45c65ba2af4a6a79166aa0f496bf04d06987b6d2ea205bdb0d347718b9aeff5b61dfff344993a275b79717cd815b6ad4c0beb568c4ac9c36ff1c315ec1119a1993c4b61e6eaa0375e0aaf738ac691abd3263bf937e3").unwrap());
2530
2531                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret, &onion_packet_3.data[..]);
2532                 assert_eq!(onion_packet_4.data, hex::decode("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").unwrap());
2533
2534                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret, &onion_packet_4.data[..]);
2535                 assert_eq!(onion_packet_5.data, hex::decode("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").unwrap());
2536         }
2537
2538         fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction, chan_id: u32) {
2539                 assert!(chain.does_match_tx(tx));
2540                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2541                 chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id; 1]);
2542                 for i in 2..100 {
2543                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2544                         chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
2545                 }
2546         }
2547
2548         struct Node {
2549                 chain_monitor: Arc<chaininterface::ChainWatchInterfaceUtil>,
2550                 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
2551                 chan_monitor: Arc<test_utils::TestChannelMonitor>,
2552                 node: Arc<ChannelManager>,
2553                 router: Router,
2554                 network_payment_count: Rc<RefCell<u8>>,
2555                 network_chan_count: Rc<RefCell<u32>>,
2556         }
2557         impl Drop for Node {
2558                 fn drop(&mut self) {
2559                         if !::std::thread::panicking() {
2560                                 // Check that we processed all pending events
2561                                 assert_eq!(self.node.get_and_clear_pending_events().len(), 0);
2562                                 assert_eq!(self.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2563                         }
2564                 }
2565         }
2566
2567         fn create_chan_between_nodes(node_a: &Node, node_b: &Node) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2568                 create_chan_between_nodes_with_value(node_a, node_b, 100000, 10001)
2569         }
2570
2571         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) {
2572                 let (funding_locked, channel_id, tx) = create_chan_between_nodes_with_value_a(node_a, node_b, channel_value, push_msat);
2573                 let (announcement, as_update, bs_update) = create_chan_between_nodes_with_value_b(node_a, node_b, &funding_locked);
2574                 (announcement, as_update, bs_update, channel_id, tx)
2575         }
2576
2577         fn create_chan_between_nodes_with_value_init(node_a: &Node, node_b: &Node, channel_value: u64, push_msat: u64) -> Transaction {
2578                 node_a.node.create_channel(node_b.node.get_our_node_id(), channel_value, push_msat, 42).unwrap();
2579
2580                 let events_1 = node_a.node.get_and_clear_pending_events();
2581                 assert_eq!(events_1.len(), 1);
2582                 let accept_chan = match events_1[0] {
2583                         Event::SendOpenChannel { ref node_id, ref msg } => {
2584                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2585                                 node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), msg).unwrap()
2586                         },
2587                         _ => panic!("Unexpected event"),
2588                 };
2589
2590                 node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &accept_chan).unwrap();
2591
2592                 let chan_id = *node_a.network_chan_count.borrow();
2593                 let tx;
2594                 let funding_output;
2595
2596                 let events_2 = node_a.node.get_and_clear_pending_events();
2597                 assert_eq!(events_2.len(), 1);
2598                 match events_2[0] {
2599                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
2600                                 assert_eq!(*channel_value_satoshis, channel_value);
2601                                 assert_eq!(user_channel_id, 42);
2602
2603                                 tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
2604                                         value: *channel_value_satoshis, script_pubkey: output_script.clone(),
2605                                 }]};
2606                                 funding_output = OutPoint::new(Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
2607
2608                                 node_a.node.funding_transaction_generated(&temporary_channel_id, funding_output);
2609                                 let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2610                                 assert_eq!(added_monitors.len(), 1);
2611                                 assert_eq!(added_monitors[0].0, funding_output);
2612                                 added_monitors.clear();
2613                         },
2614                         _ => panic!("Unexpected event"),
2615                 }
2616
2617                 let events_3 = node_a.node.get_and_clear_pending_events();
2618                 assert_eq!(events_3.len(), 1);
2619                 let funding_signed = match events_3[0] {
2620                         Event::SendFundingCreated { ref node_id, ref msg } => {
2621                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2622                                 let res = node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), msg).unwrap();
2623                                 let mut added_monitors = node_b.chan_monitor.added_monitors.lock().unwrap();
2624                                 assert_eq!(added_monitors.len(), 1);
2625                                 assert_eq!(added_monitors[0].0, funding_output);
2626                                 added_monitors.clear();
2627                                 res
2628                         },
2629                         _ => panic!("Unexpected event"),
2630                 };
2631
2632                 node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &funding_signed).unwrap();
2633                 {
2634                         let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2635                         assert_eq!(added_monitors.len(), 1);
2636                         assert_eq!(added_monitors[0].0, funding_output);
2637                         added_monitors.clear();
2638                 }
2639
2640                 let events_4 = node_a.node.get_and_clear_pending_events();
2641                 assert_eq!(events_4.len(), 1);
2642                 match events_4[0] {
2643                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
2644                                 assert_eq!(user_channel_id, 42);
2645                                 assert_eq!(*funding_txo, funding_output);
2646                         },
2647                         _ => panic!("Unexpected event"),
2648                 };
2649
2650                 tx
2651         }
2652
2653         fn create_chan_between_nodes_with_value_confirm(node_a: &Node, node_b: &Node, tx: &Transaction) -> ((msgs::FundingLocked, msgs::AnnouncementSignatures), [u8; 32]) {
2654                 confirm_transaction(&node_b.chain_monitor, &tx, tx.version);
2655                 let events_5 = node_b.node.get_and_clear_pending_events();
2656                 assert_eq!(events_5.len(), 1);
2657                 match events_5[0] {
2658                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2659                                 assert_eq!(*node_id, node_a.node.get_our_node_id());
2660                                 assert!(announcement_sigs.is_none());
2661                                 node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), msg).unwrap()
2662                         },
2663                         _ => panic!("Unexpected event"),
2664                 };
2665
2666                 let channel_id;
2667
2668                 confirm_transaction(&node_a.chain_monitor, &tx, tx.version);
2669                 let events_6 = node_a.node.get_and_clear_pending_events();
2670                 assert_eq!(events_6.len(), 1);
2671                 (match events_6[0] {
2672                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2673                                 channel_id = msg.channel_id.clone();
2674                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2675                                 (msg.clone(), announcement_sigs.clone().unwrap())
2676                         },
2677                         _ => panic!("Unexpected event"),
2678                 }, channel_id)
2679         }
2680
2681         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) {
2682                 let tx = create_chan_between_nodes_with_value_init(node_a, node_b, channel_value, push_msat);
2683                 let (msgs, chan_id) = create_chan_between_nodes_with_value_confirm(node_a, node_b, &tx);
2684                 (msgs, chan_id, tx)
2685         }
2686
2687         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) {
2688                 let bs_announcement_sigs = {
2689                         let bs_announcement_sigs = node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), &as_funding_msgs.0).unwrap().unwrap();
2690                         node_b.node.handle_announcement_signatures(&node_a.node.get_our_node_id(), &as_funding_msgs.1).unwrap();
2691                         bs_announcement_sigs
2692                 };
2693
2694                 let events_7 = node_b.node.get_and_clear_pending_events();
2695                 assert_eq!(events_7.len(), 1);
2696                 let (announcement, bs_update) = match events_7[0] {
2697                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2698                                 (msg, update_msg)
2699                         },
2700                         _ => panic!("Unexpected event"),
2701                 };
2702
2703                 node_a.node.handle_announcement_signatures(&node_b.node.get_our_node_id(), &bs_announcement_sigs).unwrap();
2704                 let events_8 = node_a.node.get_and_clear_pending_events();
2705                 assert_eq!(events_8.len(), 1);
2706                 let as_update = match events_8[0] {
2707                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2708                                 assert!(*announcement == *msg);
2709                                 update_msg
2710                         },
2711                         _ => panic!("Unexpected event"),
2712                 };
2713
2714                 *node_a.network_chan_count.borrow_mut() += 1;
2715
2716                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone())
2717         }
2718
2719         fn create_announced_chan_between_nodes(nodes: &Vec<Node>, a: usize, b: usize) -> (msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2720                 create_announced_chan_between_nodes_with_value(nodes, a, b, 100000, 10001)
2721         }
2722
2723         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) {
2724                 let chan_announcement = create_chan_between_nodes_with_value(&nodes[a], &nodes[b], channel_value, push_msat);
2725                 for node in nodes {
2726                         assert!(node.router.handle_channel_announcement(&chan_announcement.0).unwrap());
2727                         node.router.handle_channel_update(&chan_announcement.1).unwrap();
2728                         node.router.handle_channel_update(&chan_announcement.2).unwrap();
2729                 }
2730                 (chan_announcement.1, chan_announcement.2, chan_announcement.3, chan_announcement.4)
2731         }
2732
2733         macro_rules! check_spends {
2734                 ($tx: expr, $spends_tx: expr) => {
2735                         {
2736                                 let mut funding_tx_map = HashMap::new();
2737                                 let spends_tx = $spends_tx;
2738                                 funding_tx_map.insert(spends_tx.txid(), spends_tx);
2739                                 $tx.verify(&funding_tx_map).unwrap();
2740                         }
2741                 }
2742         }
2743
2744         fn close_channel(outbound_node: &Node, inbound_node: &Node, channel_id: &[u8; 32], funding_tx: Transaction, close_inbound_first: bool) -> (msgs::ChannelUpdate, msgs::ChannelUpdate) {
2745                 let (node_a, broadcaster_a) = if close_inbound_first { (&inbound_node.node, &inbound_node.tx_broadcaster) } else { (&outbound_node.node, &outbound_node.tx_broadcaster) };
2746                 let (node_b, broadcaster_b) = if close_inbound_first { (&outbound_node.node, &outbound_node.tx_broadcaster) } else { (&inbound_node.node, &inbound_node.tx_broadcaster) };
2747                 let (tx_a, tx_b);
2748
2749                 node_a.close_channel(channel_id).unwrap();
2750                 let events_1 = node_a.get_and_clear_pending_events();
2751                 assert_eq!(events_1.len(), 1);
2752                 let shutdown_a = match events_1[0] {
2753                         Event::SendShutdown { ref node_id, ref msg } => {
2754                                 assert_eq!(node_id, &node_b.get_our_node_id());
2755                                 msg.clone()
2756                         },
2757                         _ => panic!("Unexpected event"),
2758                 };
2759
2760                 let (shutdown_b, mut closing_signed_b) = node_b.handle_shutdown(&node_a.get_our_node_id(), &shutdown_a).unwrap();
2761                 if !close_inbound_first {
2762                         assert!(closing_signed_b.is_none());
2763                 }
2764                 let (empty_a, mut closing_signed_a) = node_a.handle_shutdown(&node_b.get_our_node_id(), &shutdown_b.unwrap()).unwrap();
2765                 assert!(empty_a.is_none());
2766                 if close_inbound_first {
2767                         assert!(closing_signed_a.is_none());
2768                         closing_signed_a = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2769                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2770                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2771
2772                         let empty_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2773                         assert!(empty_b.is_none());
2774                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2775                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2776                 } else {
2777                         closing_signed_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2778                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2779                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2780
2781                         let empty_a2 = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2782                         assert!(empty_a2.is_none());
2783                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2784                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2785                 }
2786                 assert_eq!(tx_a, tx_b);
2787                 check_spends!(tx_a, funding_tx);
2788
2789                 let events_2 = node_a.get_and_clear_pending_events();
2790                 assert_eq!(events_2.len(), 1);
2791                 let as_update = match events_2[0] {
2792                         Event::BroadcastChannelUpdate { ref msg } => {
2793                                 msg.clone()
2794                         },
2795                         _ => panic!("Unexpected event"),
2796                 };
2797
2798                 let events_3 = node_b.get_and_clear_pending_events();
2799                 assert_eq!(events_3.len(), 1);
2800                 let bs_update = match events_3[0] {
2801                         Event::BroadcastChannelUpdate { ref msg } => {
2802                                 msg.clone()
2803                         },
2804                         _ => panic!("Unexpected event"),
2805                 };
2806
2807                 (as_update, bs_update)
2808         }
2809
2810         struct SendEvent {
2811                 node_id: PublicKey,
2812                 msgs: Vec<msgs::UpdateAddHTLC>,
2813                 commitment_msg: msgs::CommitmentSigned,
2814         }
2815         impl SendEvent {
2816                 fn from_event(event: Event) -> SendEvent {
2817                         match event {
2818                                 Event::UpdateHTLCs { node_id, updates: msgs::CommitmentUpdate { update_add_htlcs, update_fulfill_htlcs, update_fail_htlcs, update_fail_malformed_htlcs, update_fee, commitment_signed } } => {
2819                                         assert!(update_fulfill_htlcs.is_empty());
2820                                         assert!(update_fail_htlcs.is_empty());
2821                                         assert!(update_fail_malformed_htlcs.is_empty());
2822                                         assert!(update_fee.is_none());
2823                                         SendEvent { node_id: node_id, msgs: update_add_htlcs, commitment_msg: commitment_signed }
2824                                 },
2825                                 _ => panic!("Unexpected event type!"),
2826                         }
2827                 }
2828         }
2829
2830         macro_rules! check_added_monitors {
2831                 ($node: expr, $count: expr) => {
2832                         {
2833                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2834                                 assert_eq!(added_monitors.len(), $count);
2835                                 added_monitors.clear();
2836                         }
2837                 }
2838         }
2839
2840         macro_rules! commitment_signed_dance {
2841                 ($node_a: expr, $node_b: expr, $commitment_signed: expr, $fail_backwards: expr) => {
2842                         {
2843                                 check_added_monitors!($node_a, 0);
2844                                 let (as_revoke_and_ack, as_commitment_signed) = $node_a.node.handle_commitment_signed(&$node_b.node.get_our_node_id(), &$commitment_signed).unwrap();
2845                                 check_added_monitors!($node_a, 1);
2846                                 check_added_monitors!($node_b, 0);
2847                                 assert!($node_b.node.handle_revoke_and_ack(&$node_a.node.get_our_node_id(), &as_revoke_and_ack).unwrap().is_none());
2848                                 check_added_monitors!($node_b, 1);
2849                                 let (bs_revoke_and_ack, bs_none) = $node_b.node.handle_commitment_signed(&$node_a.node.get_our_node_id(), &as_commitment_signed.unwrap()).unwrap();
2850                                 assert!(bs_none.is_none());
2851                                 check_added_monitors!($node_b, 1);
2852                                 if $fail_backwards {
2853                                         assert!($node_a.node.get_and_clear_pending_events().is_empty());
2854                                 }
2855                                 assert!($node_a.node.handle_revoke_and_ack(&$node_b.node.get_our_node_id(), &bs_revoke_and_ack).unwrap().is_none());
2856                                 {
2857                                         let mut added_monitors = $node_a.chan_monitor.added_monitors.lock().unwrap();
2858                                         if $fail_backwards {
2859                                                 assert_eq!(added_monitors.len(), 2);
2860                                                 assert!(added_monitors[0].0 != added_monitors[1].0);
2861                                         } else {
2862                                                 assert_eq!(added_monitors.len(), 1);
2863                                         }
2864                                         added_monitors.clear();
2865                                 }
2866                         }
2867                 }
2868         }
2869
2870         macro_rules! get_payment_preimage_hash {
2871                 ($node: expr) => {
2872                         {
2873                                 let payment_preimage = [*$node.network_payment_count.borrow(); 32];
2874                                 *$node.network_payment_count.borrow_mut() += 1;
2875                                 let mut payment_hash = [0; 32];
2876                                 let mut sha = Sha256::new();
2877                                 sha.input(&payment_preimage[..]);
2878                                 sha.result(&mut payment_hash);
2879                                 (payment_preimage, payment_hash)
2880                         }
2881                 }
2882         }
2883
2884         fn send_along_route(origin_node: &Node, route: Route, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2885                 let (our_payment_preimage, our_payment_hash) = get_payment_preimage_hash!(origin_node);
2886
2887                 let mut payment_event = {
2888                         origin_node.node.send_payment(route, our_payment_hash).unwrap();
2889                         check_added_monitors!(origin_node, 1);
2890
2891                         let mut events = origin_node.node.get_and_clear_pending_events();
2892                         assert_eq!(events.len(), 1);
2893                         SendEvent::from_event(events.remove(0))
2894                 };
2895                 let mut prev_node = origin_node;
2896
2897                 for (idx, &node) in expected_route.iter().enumerate() {
2898                         assert_eq!(node.node.get_our_node_id(), payment_event.node_id);
2899
2900                         node.node.handle_update_add_htlc(&prev_node.node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
2901                         check_added_monitors!(node, 0);
2902                         commitment_signed_dance!(node, prev_node, payment_event.commitment_msg, false);
2903
2904                         let events_1 = node.node.get_and_clear_pending_events();
2905                         assert_eq!(events_1.len(), 1);
2906                         match events_1[0] {
2907                                 Event::PendingHTLCsForwardable { .. } => { },
2908                                 _ => panic!("Unexpected event"),
2909                         };
2910
2911                         node.node.channel_state.lock().unwrap().next_forward = Instant::now();
2912                         node.node.process_pending_htlc_forwards();
2913
2914                         let mut events_2 = node.node.get_and_clear_pending_events();
2915                         assert_eq!(events_2.len(), 1);
2916                         if idx == expected_route.len() - 1 {
2917                                 match events_2[0] {
2918                                         Event::PaymentReceived { ref payment_hash, amt } => {
2919                                                 assert_eq!(our_payment_hash, *payment_hash);
2920                                                 assert_eq!(amt, recv_value);
2921                                         },
2922                                         _ => panic!("Unexpected event"),
2923                                 }
2924                         } else {
2925                                 check_added_monitors!(node, 1);
2926                                 payment_event = SendEvent::from_event(events_2.remove(0));
2927                                 assert_eq!(payment_event.msgs.len(), 1);
2928                         }
2929
2930                         prev_node = node;
2931                 }
2932
2933                 (our_payment_preimage, our_payment_hash)
2934         }
2935
2936         fn claim_payment_along_route(origin_node: &Node, expected_route: &[&Node], skip_last: bool, our_payment_preimage: [u8; 32]) {
2937                 assert!(expected_route.last().unwrap().node.claim_funds(our_payment_preimage));
2938                 check_added_monitors!(expected_route.last().unwrap(), 1);
2939
2940                 let mut next_msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)> = None;
2941                 macro_rules! update_fulfill_dance {
2942                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2943                                 {
2944                                         $node.node.handle_update_fulfill_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2945                                         if $last_node {
2946                                                 check_added_monitors!($node, 0);
2947                                         } else {
2948                                                 check_added_monitors!($node, 1);
2949                                         }
2950                                         commitment_signed_dance!($node, $prev_node, next_msgs.as_ref().unwrap().1, false);
2951                                 }
2952                         }
2953                 }
2954
2955                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2956                 let mut prev_node = expected_route.last().unwrap();
2957                 for (idx, node) in expected_route.iter().rev().enumerate() {
2958                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2959                         if next_msgs.is_some() {
2960                                 update_fulfill_dance!(node, prev_node, false);
2961                         }
2962
2963                         let events = node.node.get_and_clear_pending_events();
2964                         if !skip_last || idx != expected_route.len() - 1 {
2965                                 assert_eq!(events.len(), 1);
2966                                 match events[0] {
2967                                         Event::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 } } => {
2968                                                 assert!(update_add_htlcs.is_empty());
2969                                                 assert_eq!(update_fulfill_htlcs.len(), 1);
2970                                                 assert!(update_fail_htlcs.is_empty());
2971                                                 assert!(update_fail_malformed_htlcs.is_empty());
2972                                                 assert!(update_fee.is_none());
2973                                                 expected_next_node = node_id.clone();
2974                                                 next_msgs = Some((update_fulfill_htlcs[0].clone(), commitment_signed.clone()));
2975                                         },
2976                                         _ => panic!("Unexpected event"),
2977                                 }
2978                         } else {
2979                                 assert!(events.is_empty());
2980                         }
2981                         if !skip_last && idx == expected_route.len() - 1 {
2982                                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2983                         }
2984
2985                         prev_node = node;
2986                 }
2987
2988                 if !skip_last {
2989                         update_fulfill_dance!(origin_node, expected_route.first().unwrap(), true);
2990                         let events = origin_node.node.get_and_clear_pending_events();
2991                         assert_eq!(events.len(), 1);
2992                         match events[0] {
2993                                 Event::PaymentSent { payment_preimage } => {
2994                                         assert_eq!(payment_preimage, our_payment_preimage);
2995                                 },
2996                                 _ => panic!("Unexpected event"),
2997                         }
2998                 }
2999         }
3000
3001         fn claim_payment(origin_node: &Node, expected_route: &[&Node], our_payment_preimage: [u8; 32]) {
3002                 claim_payment_along_route(origin_node, expected_route, false, our_payment_preimage);
3003         }
3004
3005         const TEST_FINAL_CLTV: u32 = 32;
3006
3007         fn route_payment(origin_node: &Node, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
3008                 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();
3009                 assert_eq!(route.hops.len(), expected_route.len());
3010                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
3011                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
3012                 }
3013
3014                 send_along_route(origin_node, route, expected_route, recv_value)
3015         }
3016
3017         fn route_over_limit(origin_node: &Node, expected_route: &[&Node], recv_value: u64) {
3018                 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();
3019                 assert_eq!(route.hops.len(), expected_route.len());
3020                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
3021                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
3022                 }
3023
3024                 let (_, our_payment_hash) = get_payment_preimage_hash!(origin_node);
3025
3026                 let err = origin_node.node.send_payment(route, our_payment_hash).err().unwrap();
3027                 match err {
3028                         APIError::RouteError{err} => assert_eq!(err, "Cannot send value that would put us over our max HTLC value in flight"),
3029                         _ => panic!("Unknown error variants"),
3030                 };
3031         }
3032
3033         fn send_payment(origin: &Node, expected_route: &[&Node], recv_value: u64) {
3034                 let our_payment_preimage = route_payment(&origin, expected_route, recv_value).0;
3035                 claim_payment(&origin, expected_route, our_payment_preimage);
3036         }
3037
3038         fn fail_payment_along_route(origin_node: &Node, expected_route: &[&Node], skip_last: bool, our_payment_hash: [u8; 32]) {
3039                 assert!(expected_route.last().unwrap().node.fail_htlc_backwards(&our_payment_hash));
3040                 check_added_monitors!(expected_route.last().unwrap(), 1);
3041
3042                 let mut next_msgs: Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)> = None;
3043                 macro_rules! update_fail_dance {
3044                         ($node: expr, $prev_node: expr, $last_node: expr) => {
3045                                 {
3046                                         $node.node.handle_update_fail_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
3047                                         commitment_signed_dance!($node, $prev_node, next_msgs.as_ref().unwrap().1, !$last_node);
3048                                 }
3049                         }
3050                 }
3051
3052                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
3053                 let mut prev_node = expected_route.last().unwrap();
3054                 for (idx, node) in expected_route.iter().rev().enumerate() {
3055                         assert_eq!(expected_next_node, node.node.get_our_node_id());
3056                         if next_msgs.is_some() {
3057                                 // We may be the "last node" for the purpose of the commitment dance if we're
3058                                 // skipping the last node (implying it is disconnected) and we're the
3059                                 // second-to-last node!
3060                                 update_fail_dance!(node, prev_node, skip_last && idx == expected_route.len() - 1);
3061                         }
3062
3063                         let events = node.node.get_and_clear_pending_events();
3064                         if !skip_last || idx != expected_route.len() - 1 {
3065                                 assert_eq!(events.len(), 1);
3066                                 match events[0] {
3067                                         Event::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 } } => {
3068                                                 assert!(update_add_htlcs.is_empty());
3069                                                 assert!(update_fulfill_htlcs.is_empty());
3070                                                 assert_eq!(update_fail_htlcs.len(), 1);
3071                                                 assert!(update_fail_malformed_htlcs.is_empty());
3072                                                 assert!(update_fee.is_none());
3073                                                 expected_next_node = node_id.clone();
3074                                                 next_msgs = Some((update_fail_htlcs[0].clone(), commitment_signed.clone()));
3075                                         },
3076                                         _ => panic!("Unexpected event"),
3077                                 }
3078                         } else {
3079                                 assert!(events.is_empty());
3080                         }
3081                         if !skip_last && idx == expected_route.len() - 1 {
3082                                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
3083                         }
3084
3085                         prev_node = node;
3086                 }
3087
3088                 if !skip_last {
3089                         update_fail_dance!(origin_node, expected_route.first().unwrap(), true);
3090
3091                         let events = origin_node.node.get_and_clear_pending_events();
3092                         assert_eq!(events.len(), 1);
3093                         match events[0] {
3094                                 Event::PaymentFailed { payment_hash } => {
3095                                         assert_eq!(payment_hash, our_payment_hash);
3096                                 },
3097                                 _ => panic!("Unexpected event"),
3098                         }
3099                 }
3100         }
3101
3102         fn fail_payment(origin_node: &Node, expected_route: &[&Node], our_payment_hash: [u8; 32]) {
3103                 fail_payment_along_route(origin_node, expected_route, false, our_payment_hash);
3104         }
3105
3106         fn create_network(node_count: usize) -> Vec<Node> {
3107                 let mut nodes = Vec::new();
3108                 let mut rng = thread_rng();
3109                 let secp_ctx = Secp256k1::new();
3110                 let logger: Arc<Logger> = Arc::new(test_utils::TestLogger::new());
3111
3112                 let chan_count = Rc::new(RefCell::new(0));
3113                 let payment_count = Rc::new(RefCell::new(0));
3114
3115                 for _ in 0..node_count {
3116                         let feeest = Arc::new(test_utils::TestFeeEstimator { sat_per_kw: 253 });
3117                         let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new(Network::Testnet, Arc::clone(&logger)));
3118                         let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
3119                         let chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor.clone(), tx_broadcaster.clone()));
3120                         let node_id = {
3121                                 let mut key_slice = [0; 32];
3122                                 rng.fill_bytes(&mut key_slice);
3123                                 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
3124                         };
3125                         let node = ChannelManager::new(node_id.clone(), 0, true, Network::Testnet, feeest.clone(), chan_monitor.clone(), chain_monitor.clone(), tx_broadcaster.clone(), Arc::clone(&logger)).unwrap();
3126                         let router = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id), chain_monitor.clone(), Arc::clone(&logger));
3127                         nodes.push(Node { chain_monitor, tx_broadcaster, chan_monitor, node, router,
3128                                 network_payment_count: payment_count.clone(),
3129                                 network_chan_count: chan_count.clone(),
3130                         });
3131                 }
3132
3133                 nodes
3134         }
3135
3136         #[test]
3137         fn test_async_inbound_update_fee() {
3138                 let mut nodes = create_network(2);
3139                 let chan = create_announced_chan_between_nodes(&nodes, 0, 1);
3140                 let channel_id = chan.2;
3141
3142                 macro_rules! get_feerate {
3143                         ($node: expr) => {{
3144                                 let chan_lock = $node.node.channel_state.lock().unwrap();
3145                                 let chan = chan_lock.by_id.get(&channel_id).unwrap();
3146                                 chan.get_feerate()
3147                         }}
3148                 }
3149
3150                 // balancing
3151                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
3152
3153                 // A                                        B
3154                 // update_fee                            ->
3155                 // send (1) commitment_signed            -.
3156                 //                                       <- update_add_htlc/commitment_signed
3157                 // send (2) RAA (awaiting remote revoke) -.
3158                 // (1) commitment_signed is delivered    ->
3159                 //                                       .- send (3) RAA (awaiting remote revoke)
3160                 // (2) RAA is delivered                  ->
3161                 //                                       .- send (4) commitment_signed
3162                 //                                       <- (3) RAA is delivered
3163                 // send (5) commitment_signed            -.
3164                 //                                       <- (4) commitment_signed is delivered
3165                 // send (6) RAA                          -.
3166                 // (5) commitment_signed is delivered    ->
3167                 //                                       <- RAA
3168                 // (6) RAA is delivered                  ->
3169
3170                 // First nodes[0] generates an update_fee
3171                 nodes[0].node.update_fee(channel_id, get_feerate!(nodes[0]) + 20).unwrap();
3172                 check_added_monitors!(nodes[0], 1);
3173
3174                 let events_0 = nodes[0].node.get_and_clear_pending_events();
3175                 assert_eq!(events_0.len(), 1);
3176                 let (update_msg, commitment_signed) = match events_0[0] { // (1)
3177                         Event::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, ref commitment_signed, .. }, .. } => {
3178                                 (update_fee.as_ref(), commitment_signed)
3179                         },
3180                         _ => panic!("Unexpected event"),
3181                 };
3182
3183                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap()).unwrap();
3184
3185                 // ...but before it's delivered, nodes[1] starts to send a payment back to nodes[0]...
3186                 let (_, our_payment_hash) = get_payment_preimage_hash!(nodes[0]);
3187                 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();
3188                 check_added_monitors!(nodes[1], 1);
3189
3190                 let payment_event = {
3191                         let mut events_1 = nodes[1].node.get_and_clear_pending_events();
3192                         assert_eq!(events_1.len(), 1);
3193                         SendEvent::from_event(events_1.remove(0))
3194                 };
3195                 assert_eq!(payment_event.node_id, nodes[0].node.get_our_node_id());
3196                 assert_eq!(payment_event.msgs.len(), 1);
3197
3198                 // ...now when the messages get delivered everyone should be happy
3199                 nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
3200                 let (as_revoke_msg, as_commitment_signed) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &payment_event.commitment_msg).unwrap(); // (2)
3201                 assert!(as_commitment_signed.is_none()); // nodes[0] is awaiting nodes[1] revoke_and_ack
3202                 check_added_monitors!(nodes[0], 1);
3203
3204                 // deliver(1), generate (3):
3205                 let (bs_revoke_msg, bs_commitment_signed) = nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed).unwrap();
3206                 assert!(bs_commitment_signed.is_none()); // nodes[1] is awaiting nodes[0] revoke_and_ack
3207                 check_added_monitors!(nodes[1], 1);
3208
3209                 let bs_update = nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_msg).unwrap(); // deliver (2)
3210                 assert!(bs_update.as_ref().unwrap().update_add_htlcs.is_empty()); // (4)
3211                 assert!(bs_update.as_ref().unwrap().update_fulfill_htlcs.is_empty()); // (4)
3212                 assert!(bs_update.as_ref().unwrap().update_fail_htlcs.is_empty()); // (4)
3213                 assert!(bs_update.as_ref().unwrap().update_fail_malformed_htlcs.is_empty()); // (4)
3214                 assert!(bs_update.as_ref().unwrap().update_fee.is_none()); // (4)
3215                 check_added_monitors!(nodes[1], 1);
3216
3217                 let as_update = nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_msg).unwrap(); // deliver (3)
3218                 assert!(as_update.as_ref().unwrap().update_add_htlcs.is_empty()); // (5)
3219                 assert!(as_update.as_ref().unwrap().update_fulfill_htlcs.is_empty()); // (5)
3220                 assert!(as_update.as_ref().unwrap().update_fail_htlcs.is_empty()); // (5)
3221                 assert!(as_update.as_ref().unwrap().update_fail_malformed_htlcs.is_empty()); // (5)
3222                 assert!(as_update.as_ref().unwrap().update_fee.is_none()); // (5)
3223                 check_added_monitors!(nodes[0], 1);
3224
3225                 let (as_second_revoke, as_second_commitment_signed) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_update.unwrap().commitment_signed).unwrap(); // deliver (4)
3226                 assert!(as_second_commitment_signed.is_none()); // only (6)
3227                 check_added_monitors!(nodes[0], 1);
3228
3229                 let (bs_second_revoke, bs_second_commitment_signed) = nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_update.unwrap().commitment_signed).unwrap(); // deliver (5)
3230                 assert!(bs_second_commitment_signed.is_none());
3231                 check_added_monitors!(nodes[1], 1);
3232
3233                 assert!(nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_second_revoke).unwrap().is_none());
3234                 check_added_monitors!(nodes[0], 1);
3235
3236                 let events_2 = nodes[0].node.get_and_clear_pending_events();
3237                 assert_eq!(events_2.len(), 1);
3238                 match events_2[0] {
3239                         Event::PendingHTLCsForwardable {..} => {}, // If we actually processed we'd receive the payment
3240                         _ => panic!("Unexpected event"),
3241                 }
3242
3243                 assert!(nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_second_revoke).unwrap().is_none()); // deliver (6)
3244                 check_added_monitors!(nodes[1], 1);
3245         }
3246
3247         #[test]
3248         fn test_update_fee_unordered_raa() {
3249                 // Just the intro to the previous test followed by an out-of-order RAA (which caused a
3250                 // crash in an earlier version of the update_fee patch)
3251                 let mut nodes = create_network(2);
3252                 let chan = create_announced_chan_between_nodes(&nodes, 0, 1);
3253                 let channel_id = chan.2;
3254
3255                 macro_rules! get_feerate {
3256                         ($node: expr) => {{
3257                                 let chan_lock = $node.node.channel_state.lock().unwrap();
3258                                 let chan = chan_lock.by_id.get(&channel_id).unwrap();
3259                                 chan.get_feerate()
3260                         }}
3261                 }
3262
3263                 // balancing
3264                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
3265
3266                 // First nodes[0] generates an update_fee
3267                 nodes[0].node.update_fee(channel_id, get_feerate!(nodes[0]) + 20).unwrap();
3268                 check_added_monitors!(nodes[0], 1);
3269
3270                 let events_0 = nodes[0].node.get_and_clear_pending_events();
3271                 assert_eq!(events_0.len(), 1);
3272                 let update_msg = match events_0[0] { // (1)
3273                         Event::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, .. }, .. } => {
3274                                 update_fee.as_ref()
3275                         },
3276                         _ => panic!("Unexpected event"),
3277                 };
3278
3279                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap()).unwrap();
3280
3281                 // ...but before it's delivered, nodes[1] starts to send a payment back to nodes[0]...
3282                 let (_, our_payment_hash) = get_payment_preimage_hash!(nodes[0]);
3283                 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();
3284                 check_added_monitors!(nodes[1], 1);
3285
3286                 let payment_event = {
3287                         let mut events_1 = nodes[1].node.get_and_clear_pending_events();
3288                         assert_eq!(events_1.len(), 1);
3289                         SendEvent::from_event(events_1.remove(0))
3290                 };
3291                 assert_eq!(payment_event.node_id, nodes[0].node.get_our_node_id());
3292                 assert_eq!(payment_event.msgs.len(), 1);
3293
3294                 // ...now when the messages get delivered everyone should be happy
3295                 nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
3296                 let (as_revoke_msg, as_commitment_signed) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &payment_event.commitment_msg).unwrap(); // (2)
3297                 assert!(as_commitment_signed.is_none()); // nodes[0] is awaiting nodes[1] revoke_and_ack
3298                 check_added_monitors!(nodes[0], 1);
3299
3300                 assert!(nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_msg).unwrap().is_none()); // deliver (2)
3301                 check_added_monitors!(nodes[1], 1);
3302
3303                 // We can't continue, sadly, because our (1) now has a bogus signature
3304         }
3305
3306         #[test]
3307         fn test_multi_flight_update_fee() {
3308                 let nodes = create_network(2);
3309                 let chan = create_announced_chan_between_nodes(&nodes, 0, 1);
3310                 let channel_id = chan.2;
3311
3312                 macro_rules! get_feerate {
3313                         ($node: expr) => {{
3314                                 let chan_lock = $node.node.channel_state.lock().unwrap();
3315                                 let chan = chan_lock.by_id.get(&channel_id).unwrap();
3316                                 chan.get_feerate()
3317                         }}
3318                 }
3319
3320                 // A                                        B
3321                 // update_fee/commitment_signed          ->
3322                 //                                       .- send (1) RAA and (2) commitment_signed
3323                 // update_fee (never committed)          ->
3324                 // (3) update_fee                        ->
3325                 // We have to manually generate the above update_fee, it is allowed by the protocol but we
3326                 // don't track which updates correspond to which revoke_and_ack responses so we're in
3327                 // AwaitingRAA mode and will not generate the update_fee yet.
3328                 //                                       <- (1) RAA delivered
3329                 // (3) is generated and send (4) CS      -.
3330                 // Note that A cannot generate (4) prior to (1) being delivered as it otherwise doesn't
3331                 // know the per_commitment_point to use for it.
3332                 //                                       <- (2) commitment_signed delivered
3333                 // revoke_and_ack                        ->
3334                 //                                          B should send no response here
3335                 // (4) commitment_signed delivered       ->
3336                 //                                       <- RAA/commitment_signed delivered
3337                 // revoke_and_ack                        ->
3338
3339                 // First nodes[0] generates an update_fee
3340                 let initial_feerate = get_feerate!(nodes[0]);
3341                 nodes[0].node.update_fee(channel_id, initial_feerate + 20).unwrap();
3342                 check_added_monitors!(nodes[0], 1);
3343
3344                 let events_0 = nodes[0].node.get_and_clear_pending_events();
3345                 assert_eq!(events_0.len(), 1);
3346                 let (update_msg_1, commitment_signed_1) = match events_0[0] { // (1)
3347                         Event::UpdateHTLCs { updates: msgs::CommitmentUpdate { ref update_fee, ref commitment_signed, .. }, .. } => {
3348                                 (update_fee.as_ref().unwrap(), commitment_signed)
3349                         },
3350                         _ => panic!("Unexpected event"),
3351                 };
3352
3353                 // Deliver first update_fee/commitment_signed pair, generating (1) and (2):
3354                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg_1).unwrap();
3355                 let (bs_revoke_msg, bs_commitment_signed) = nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed_1).unwrap();
3356                 check_added_monitors!(nodes[1], 1);
3357
3358                 // nodes[0] is awaiting a revoke from nodes[1] before it will create a new commitment
3359                 // transaction:
3360                 nodes[0].node.update_fee(channel_id, initial_feerate + 40).unwrap();
3361                 assert!(nodes[0].node.get_and_clear_pending_events().is_empty());
3362
3363                 // Create the (3) update_fee message that nodes[0] will generate before it does...
3364                 let mut update_msg_2 = msgs::UpdateFee {
3365                         channel_id: update_msg_1.channel_id.clone(),
3366                         feerate_per_kw: (initial_feerate + 30) as u32,
3367                 };
3368
3369                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), &update_msg_2).unwrap();
3370
3371                 update_msg_2.feerate_per_kw = (initial_feerate + 40) as u32;
3372                 // Deliver (3)
3373                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), &update_msg_2).unwrap();
3374
3375                 // Deliver (1), generating (3) and (4)
3376                 let as_second_update = nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_msg).unwrap();
3377                 check_added_monitors!(nodes[0], 1);
3378                 assert!(as_second_update.as_ref().unwrap().update_add_htlcs.is_empty());
3379                 assert!(as_second_update.as_ref().unwrap().update_fulfill_htlcs.is_empty());
3380                 assert!(as_second_update.as_ref().unwrap().update_fail_htlcs.is_empty());
3381                 assert!(as_second_update.as_ref().unwrap().update_fail_malformed_htlcs.is_empty());
3382                 // Check that the update_fee newly generated matches what we delivered:
3383                 assert_eq!(as_second_update.as_ref().unwrap().update_fee.as_ref().unwrap().channel_id, update_msg_2.channel_id);
3384                 assert_eq!(as_second_update.as_ref().unwrap().update_fee.as_ref().unwrap().feerate_per_kw, update_msg_2.feerate_per_kw);
3385
3386                 // Deliver (2) commitment_signed
3387                 let (as_revoke_msg, as_commitment_signed) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), bs_commitment_signed.as_ref().unwrap()).unwrap();
3388                 check_added_monitors!(nodes[0], 1);
3389                 assert!(as_commitment_signed.is_none());
3390
3391                 assert!(nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_msg).unwrap().is_none());
3392                 check_added_monitors!(nodes[1], 1);
3393
3394                 // Delever (4)
3395                 let (bs_second_revoke, bs_second_commitment) = nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_second_update.unwrap().commitment_signed).unwrap();
3396                 check_added_monitors!(nodes[1], 1);
3397
3398                 assert!(nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_second_revoke).unwrap().is_none());
3399                 check_added_monitors!(nodes[0], 1);
3400
3401                 let (as_second_revoke, as_second_commitment) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_second_commitment.unwrap()).unwrap();
3402                 assert!(as_second_commitment.is_none());
3403                 check_added_monitors!(nodes[0], 1);
3404
3405                 assert!(nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_second_revoke).unwrap().is_none());
3406                 check_added_monitors!(nodes[1], 1);
3407         }
3408
3409         #[test]
3410         fn test_update_fee_vanilla() {
3411                 let nodes = create_network(2);
3412                 let chan = create_announced_chan_between_nodes(&nodes, 0, 1);
3413                 let channel_id = chan.2;
3414
3415                 macro_rules! get_feerate {
3416                         ($node: expr) => {{
3417                                 let chan_lock = $node.node.channel_state.lock().unwrap();
3418                                 let chan = chan_lock.by_id.get(&channel_id).unwrap();
3419                                 chan.get_feerate()
3420                         }}
3421                 }
3422
3423                 let feerate = get_feerate!(nodes[0]);
3424                 nodes[0].node.update_fee(channel_id, feerate+20).unwrap();
3425
3426                 let events_0 = nodes[0].node.get_and_clear_pending_events();
3427                 assert_eq!(events_0.len(), 1);
3428                 let (update_msg, commitment_signed) = match events_0[0] {
3429                                 Event::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 } } => {
3430                                 (update_fee.as_ref(), commitment_signed)
3431                         },
3432                         _ => panic!("Unexpected event"),
3433                 };
3434                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap()).unwrap();
3435
3436                 let (revoke_msg, commitment_signed) = nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed).unwrap();
3437                 let commitment_signed = commitment_signed.unwrap();
3438                 check_added_monitors!(nodes[0], 1);
3439                 check_added_monitors!(nodes[1], 1);
3440
3441                 let resp_option = nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_msg).unwrap();
3442                 assert!(resp_option.is_none());
3443                 check_added_monitors!(nodes[0], 1);
3444
3445                 let (revoke_msg, commitment_signed) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed).unwrap();
3446                 assert!(commitment_signed.is_none());
3447                 check_added_monitors!(nodes[0], 1);
3448
3449                 let resp_option = nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke_msg).unwrap();
3450                 assert!(resp_option.is_none());
3451                 check_added_monitors!(nodes[1], 1);
3452         }
3453
3454         #[test]
3455         fn test_update_fee_with_fundee_update_add_htlc() {
3456                 let mut nodes = create_network(2);
3457                 let chan = create_announced_chan_between_nodes(&nodes, 0, 1);
3458                 let channel_id = chan.2;
3459
3460                 macro_rules! get_feerate {
3461                         ($node: expr) => {{
3462                                 let chan_lock = $node.node.channel_state.lock().unwrap();
3463                                 let chan = chan_lock.by_id.get(&channel_id).unwrap();
3464                                 chan.get_feerate()
3465                         }}
3466                 }
3467
3468                 // balancing
3469                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
3470
3471                 let feerate = get_feerate!(nodes[0]);
3472                 nodes[0].node.update_fee(channel_id, feerate+20).unwrap();
3473
3474                 let events_0 = nodes[0].node.get_and_clear_pending_events();
3475                 assert_eq!(events_0.len(), 1);
3476                 let (update_msg, commitment_signed) = match events_0[0] {
3477                                 Event::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 } } => {
3478                                 (update_fee.as_ref(), commitment_signed)
3479                         },
3480                         _ => panic!("Unexpected event"),
3481                 };
3482                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap()).unwrap();
3483                 check_added_monitors!(nodes[0], 1);
3484                 let (revoke_msg, commitment_signed) = nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed).unwrap();
3485                 let commitment_signed = commitment_signed.unwrap();
3486                 check_added_monitors!(nodes[1], 1);
3487
3488                 let route = nodes[1].router.get_route(&nodes[0].node.get_our_node_id(), None, &Vec::new(), 800000, TEST_FINAL_CLTV).unwrap();
3489
3490                 let (our_payment_preimage, our_payment_hash) = get_payment_preimage_hash!(nodes[1]);
3491
3492                 // nothing happens since node[1] is in AwaitingRemoteRevoke
3493                 nodes[1].node.send_payment(route, our_payment_hash).unwrap();
3494                 {
3495                         let mut added_monitors = nodes[0].chan_monitor.added_monitors.lock().unwrap();
3496                         assert_eq!(added_monitors.len(), 0);
3497                         added_monitors.clear();
3498                 }
3499                 let events = nodes[0].node.get_and_clear_pending_events();
3500                 assert_eq!(events.len(), 0);
3501                 // node[1] has nothing to do
3502
3503                 let resp_option = nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_msg).unwrap();
3504                 assert!(resp_option.is_none());
3505                 check_added_monitors!(nodes[0], 1);
3506
3507                 let (revoke_msg, commitment_signed) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed).unwrap();
3508                 assert!(commitment_signed.is_none());
3509                 check_added_monitors!(nodes[0], 1);
3510                 let resp_option = nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke_msg).unwrap();
3511                 // AwaitingRemoteRevoke ends here
3512
3513                 let commitment_update = resp_option.unwrap();
3514                 assert_eq!(commitment_update.update_add_htlcs.len(), 1);
3515                 assert_eq!(commitment_update.update_fulfill_htlcs.len(), 0);
3516                 assert_eq!(commitment_update.update_fail_htlcs.len(), 0);
3517                 assert_eq!(commitment_update.update_fail_malformed_htlcs.len(), 0);
3518                 assert_eq!(commitment_update.update_fee.is_none(), true);
3519
3520                 nodes[0].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &commitment_update.update_add_htlcs[0]).unwrap();
3521                 let (revoke, commitment_signed) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_update.commitment_signed).unwrap();
3522                 check_added_monitors!(nodes[0], 1);
3523                 check_added_monitors!(nodes[1], 1);
3524                 let commitment_signed = commitment_signed.unwrap();
3525                 let resp_option = nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke).unwrap();
3526                 check_added_monitors!(nodes[1], 1);
3527                 assert!(resp_option.is_none());
3528
3529                 let (revoke, commitment_signed) = nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &commitment_signed).unwrap();
3530                 check_added_monitors!(nodes[1], 1);
3531                 assert!(commitment_signed.is_none());
3532                 let resp_option = nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke).unwrap();
3533                 check_added_monitors!(nodes[0], 1);
3534                 assert!(resp_option.is_none());
3535
3536                 let events = nodes[0].node.get_and_clear_pending_events();
3537                 assert_eq!(events.len(), 1);
3538                 match events[0] {
3539                         Event::PendingHTLCsForwardable { .. } => { },
3540                         _ => panic!("Unexpected event"),
3541                 };
3542                 nodes[0].node.channel_state.lock().unwrap().next_forward = Instant::now();
3543                 nodes[0].node.process_pending_htlc_forwards();
3544
3545                 let events = nodes[0].node.get_and_clear_pending_events();
3546                 assert_eq!(events.len(), 1);
3547                 match events[0] {
3548                         Event::PaymentReceived { .. } => { },
3549                         _ => panic!("Unexpected event"),
3550                 };
3551
3552                 claim_payment(&nodes[1], &vec!(&nodes[0])[..], our_payment_preimage);
3553
3554                 send_payment(&nodes[1], &vec!(&nodes[0])[..], 800000);
3555                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 800000);
3556                 close_channel(&nodes[0], &nodes[1], &chan.2, chan.3, true);
3557         }
3558
3559         #[test]
3560         fn test_update_fee() {
3561                 let nodes = create_network(2);
3562                 let chan = create_announced_chan_between_nodes(&nodes, 0, 1);
3563                 let channel_id = chan.2;
3564
3565                 macro_rules! get_feerate {
3566                         ($node: expr) => {{
3567                                 let chan_lock = $node.node.channel_state.lock().unwrap();
3568                                 let chan = chan_lock.by_id.get(&channel_id).unwrap();
3569                                 chan.get_feerate()
3570                         }}
3571                 }
3572
3573                 // A                                        B
3574                 // (1) update_fee/commitment_signed      ->
3575                 //                                       <- (2) revoke_and_ack
3576                 //                                       .- send (3) commitment_signed
3577                 // (4) update_fee/commitment_signed      ->
3578                 //                                       .- send (5) revoke_and_ack (no CS as we're awaiting a revoke)
3579                 //                                       <- (3) commitment_signed delivered
3580                 // send (6) revoke_and_ack               -.
3581                 //                                       <- (5) deliver revoke_and_ack
3582                 // (6) deliver revoke_and_ack            ->
3583                 //                                       .- send (7) commitment_signed in response to (4)
3584                 //                                       <- (7) deliver commitment_signed
3585                 // revoke_and_ack                        ->
3586
3587                 // Create and deliver (1)...
3588                 let feerate = get_feerate!(nodes[0]);
3589                 nodes[0].node.update_fee(channel_id, feerate+20).unwrap();
3590
3591                 let events_0 = nodes[0].node.get_and_clear_pending_events();
3592                 assert_eq!(events_0.len(), 1);
3593                 let (update_msg, commitment_signed) = match events_0[0] {
3594                                 Event::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 } } => {
3595                                 (update_fee.as_ref(), commitment_signed)
3596                         },
3597                         _ => panic!("Unexpected event"),
3598                 };
3599                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap()).unwrap();
3600
3601                 // Generate (2) and (3):
3602                 let (revoke_msg, commitment_signed) = nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed).unwrap();
3603                 let commitment_signed_0 = commitment_signed.unwrap();
3604                 check_added_monitors!(nodes[0], 1);
3605                 check_added_monitors!(nodes[1], 1);
3606
3607                 // Deliver (2):
3608                 let resp_option = nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_msg).unwrap();
3609                 assert!(resp_option.is_none());
3610                 check_added_monitors!(nodes[0], 1);
3611
3612                 // Create and deliver (4)...
3613                 nodes[0].node.update_fee(channel_id, feerate+30).unwrap();
3614                 let events_0 = nodes[0].node.get_and_clear_pending_events();
3615                 assert_eq!(events_0.len(), 1);
3616                 let (update_msg, commitment_signed) = match events_0[0] {
3617                                 Event::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 } } => {
3618                                 (update_fee.as_ref(), commitment_signed)
3619                         },
3620                         _ => panic!("Unexpected event"),
3621                 };
3622                 nodes[1].node.handle_update_fee(&nodes[0].node.get_our_node_id(), update_msg.unwrap()).unwrap();
3623
3624                 let (revoke_msg, commitment_signed) = nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), commitment_signed).unwrap();
3625                 // ... creating (5)
3626                 assert!(commitment_signed.is_none());
3627                 check_added_monitors!(nodes[0], 1);
3628                 check_added_monitors!(nodes[1], 1);
3629
3630                 // Handle (3), creating (6):
3631                 let (revoke_msg_0, commitment_signed) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed_0).unwrap();
3632                 assert!(commitment_signed.is_none());
3633                 check_added_monitors!(nodes[0], 1);
3634
3635                 // Deliver (5):
3636                 let resp_option = nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &revoke_msg).unwrap();
3637                 assert!(resp_option.is_none());
3638                 check_added_monitors!(nodes[0], 1);
3639
3640                 // Deliver (6), creating (7):
3641                 let resp_option = nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke_msg_0).unwrap();
3642                 let commitment_signed = resp_option.unwrap().commitment_signed;
3643                 check_added_monitors!(nodes[1], 1);
3644
3645                 // Deliver (7)
3646                 let (revoke_msg, commitment_signed) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed).unwrap();
3647                 assert!(commitment_signed.is_none());
3648                 check_added_monitors!(nodes[0], 1);
3649                 let resp_option = nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &revoke_msg).unwrap();
3650                 assert!(resp_option.is_none());
3651                 check_added_monitors!(nodes[1], 1);
3652
3653                 assert_eq!(get_feerate!(nodes[0]), feerate + 30);
3654                 assert_eq!(get_feerate!(nodes[1]), feerate + 30);
3655                 close_channel(&nodes[0], &nodes[1], &chan.2, chan.3, true);
3656         }
3657
3658         #[test]
3659         fn fake_network_test() {
3660                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
3661                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
3662                 let nodes = create_network(4);
3663
3664                 // Create some initial channels
3665                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
3666                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
3667                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
3668
3669                 // Rebalance the network a bit by relaying one payment through all the channels...
3670                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
3671                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
3672                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
3673                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
3674
3675                 // Send some more payments
3676                 send_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 1000000);
3677                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1], &nodes[0])[..], 1000000);
3678                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1])[..], 1000000);
3679
3680                 // Test failure packets
3681                 let payment_hash_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 1000000).1;
3682                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], payment_hash_1);
3683
3684                 // Add a new channel that skips 3
3685                 let chan_4 = create_announced_chan_between_nodes(&nodes, 1, 3);
3686
3687                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 1000000);
3688                 send_payment(&nodes[2], &vec!(&nodes[3])[..], 1000000);
3689                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
3690                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
3691                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
3692                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
3693                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
3694
3695                 // Do some rebalance loop payments, simultaneously
3696                 let mut hops = Vec::with_capacity(3);
3697                 hops.push(RouteHop {
3698                         pubkey: nodes[2].node.get_our_node_id(),
3699                         short_channel_id: chan_2.0.contents.short_channel_id,
3700                         fee_msat: 0,
3701                         cltv_expiry_delta: chan_3.0.contents.cltv_expiry_delta as u32
3702                 });
3703                 hops.push(RouteHop {
3704                         pubkey: nodes[3].node.get_our_node_id(),
3705                         short_channel_id: chan_3.0.contents.short_channel_id,
3706                         fee_msat: 0,
3707                         cltv_expiry_delta: chan_4.1.contents.cltv_expiry_delta as u32
3708                 });
3709                 hops.push(RouteHop {
3710                         pubkey: nodes[1].node.get_our_node_id(),
3711                         short_channel_id: chan_4.0.contents.short_channel_id,
3712                         fee_msat: 1000000,
3713                         cltv_expiry_delta: TEST_FINAL_CLTV,
3714                 });
3715                 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;
3716                 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;
3717                 let payment_preimage_1 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[2], &nodes[3], &nodes[1])[..], 1000000).0;
3718
3719                 let mut hops = Vec::with_capacity(3);
3720                 hops.push(RouteHop {
3721                         pubkey: nodes[3].node.get_our_node_id(),
3722                         short_channel_id: chan_4.0.contents.short_channel_id,
3723                         fee_msat: 0,
3724                         cltv_expiry_delta: chan_3.1.contents.cltv_expiry_delta as u32
3725                 });
3726                 hops.push(RouteHop {
3727                         pubkey: nodes[2].node.get_our_node_id(),
3728                         short_channel_id: chan_3.0.contents.short_channel_id,
3729                         fee_msat: 0,
3730                         cltv_expiry_delta: chan_2.1.contents.cltv_expiry_delta as u32
3731                 });
3732                 hops.push(RouteHop {
3733                         pubkey: nodes[1].node.get_our_node_id(),
3734                         short_channel_id: chan_2.0.contents.short_channel_id,
3735                         fee_msat: 1000000,
3736                         cltv_expiry_delta: TEST_FINAL_CLTV,
3737                 });
3738                 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;
3739                 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;
3740                 let payment_hash_2 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[3], &nodes[2], &nodes[1])[..], 1000000).1;
3741
3742                 // Claim the rebalances...
3743                 fail_payment(&nodes[1], &vec!(&nodes[3], &nodes[2], &nodes[1])[..], payment_hash_2);
3744                 claim_payment(&nodes[1], &vec!(&nodes[2], &nodes[3], &nodes[1])[..], payment_preimage_1);
3745
3746                 // Add a duplicate new channel from 2 to 4
3747                 let chan_5 = create_announced_chan_between_nodes(&nodes, 1, 3);
3748
3749                 // Send some payments across both channels
3750                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
3751                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
3752                 let payment_preimage_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
3753
3754                 route_over_limit(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000);
3755
3756                 //TODO: Test that routes work again here as we've been notified that the channel is full
3757
3758                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_3);
3759                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_4);
3760                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_5);
3761
3762                 // Close down the channels...
3763                 close_channel(&nodes[0], &nodes[1], &chan_1.2, chan_1.3, true);
3764                 close_channel(&nodes[1], &nodes[2], &chan_2.2, chan_2.3, false);
3765                 close_channel(&nodes[2], &nodes[3], &chan_3.2, chan_3.3, true);
3766                 close_channel(&nodes[1], &nodes[3], &chan_4.2, chan_4.3, false);
3767                 close_channel(&nodes[1], &nodes[3], &chan_5.2, chan_5.3, false);
3768         }
3769
3770         #[test]
3771         fn duplicate_htlc_test() {
3772                 // Test that we accept duplicate payment_hash HTLCs across the network and that
3773                 // claiming/failing them are all separate and don't effect each other
3774                 let mut nodes = create_network(6);
3775
3776                 // Create some initial channels to route via 3 to 4/5 from 0/1/2
3777                 create_announced_chan_between_nodes(&nodes, 0, 3);
3778                 create_announced_chan_between_nodes(&nodes, 1, 3);
3779                 create_announced_chan_between_nodes(&nodes, 2, 3);
3780                 create_announced_chan_between_nodes(&nodes, 3, 4);
3781                 create_announced_chan_between_nodes(&nodes, 3, 5);
3782
3783                 let (payment_preimage, payment_hash) = route_payment(&nodes[0], &vec!(&nodes[3], &nodes[4])[..], 1000000);
3784
3785                 *nodes[0].network_payment_count.borrow_mut() -= 1;
3786                 assert_eq!(route_payment(&nodes[1], &vec!(&nodes[3])[..], 1000000).0, payment_preimage);
3787
3788                 *nodes[0].network_payment_count.borrow_mut() -= 1;
3789                 assert_eq!(route_payment(&nodes[2], &vec!(&nodes[3], &nodes[5])[..], 1000000).0, payment_preimage);
3790
3791                 claim_payment(&nodes[0], &vec!(&nodes[3], &nodes[4])[..], payment_preimage);
3792                 fail_payment(&nodes[2], &vec!(&nodes[3], &nodes[5])[..], payment_hash);
3793                 claim_payment(&nodes[1], &vec!(&nodes[3])[..], payment_preimage);
3794         }
3795
3796         #[derive(PartialEq)]
3797         enum HTLCType { NONE, TIMEOUT, SUCCESS }
3798         /// Tests that the given node has broadcast transactions for the given Channel
3799         ///
3800         /// First checks that the latest local commitment tx has been broadcast, unless an explicit
3801         /// commitment_tx is provided, which may be used to test that a remote commitment tx was
3802         /// broadcast and the revoked outputs were claimed.
3803         ///
3804         /// Next tests that there is (or is not) a transaction that spends the commitment transaction
3805         /// that appears to be the type of HTLC transaction specified in has_htlc_tx.
3806         ///
3807         /// All broadcast transactions must be accounted for in one of the above three types of we'll
3808         /// also fail.
3809         fn test_txn_broadcast(node: &Node, chan: &(msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction), commitment_tx: Option<Transaction>, has_htlc_tx: HTLCType) -> Vec<Transaction> {
3810                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
3811                 assert!(node_txn.len() >= if commitment_tx.is_some() { 0 } else { 1 } + if has_htlc_tx == HTLCType::NONE { 0 } else { 1 });
3812
3813                 let mut res = Vec::with_capacity(2);
3814                 node_txn.retain(|tx| {
3815                         if tx.input.len() == 1 && tx.input[0].previous_output.txid == chan.3.txid() {
3816                                 check_spends!(tx, chan.3.clone());
3817                                 if commitment_tx.is_none() {
3818                                         res.push(tx.clone());
3819                                 }
3820                                 false
3821                         } else { true }
3822                 });
3823                 if let Some(explicit_tx) = commitment_tx {
3824                         res.push(explicit_tx.clone());
3825                 }
3826
3827                 assert_eq!(res.len(), 1);
3828
3829                 if has_htlc_tx != HTLCType::NONE {
3830                         node_txn.retain(|tx| {
3831                                 if tx.input.len() == 1 && tx.input[0].previous_output.txid == res[0].txid() {
3832                                         check_spends!(tx, res[0].clone());
3833                                         if has_htlc_tx == HTLCType::TIMEOUT {
3834                                                 assert!(tx.lock_time != 0);
3835                                         } else {
3836                                                 assert!(tx.lock_time == 0);
3837                                         }
3838                                         res.push(tx.clone());
3839                                         false
3840                                 } else { true }
3841                         });
3842                         assert_eq!(res.len(), 2);
3843                 }
3844
3845                 assert!(node_txn.is_empty());
3846                 res
3847         }
3848
3849         /// Tests that the given node has broadcast a claim transaction against the provided revoked
3850         /// HTLC transaction.
3851         fn test_revoked_htlc_claim_txn_broadcast(node: &Node, revoked_tx: Transaction) {
3852                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
3853                 assert_eq!(node_txn.len(), 1);
3854                 node_txn.retain(|tx| {
3855                         if tx.input.len() == 1 && tx.input[0].previous_output.txid == revoked_tx.txid() {
3856                                 check_spends!(tx, revoked_tx.clone());
3857                                 false
3858                         } else { true }
3859                 });
3860                 assert!(node_txn.is_empty());
3861         }
3862
3863         fn check_preimage_claim(node: &Node, prev_txn: &Vec<Transaction>) -> Vec<Transaction> {
3864                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
3865
3866                 assert!(node_txn.len() >= 1);
3867                 assert_eq!(node_txn[0].input.len(), 1);
3868                 let mut found_prev = false;
3869
3870                 for tx in prev_txn {
3871                         if node_txn[0].input[0].previous_output.txid == tx.txid() {
3872                                 check_spends!(node_txn[0], tx.clone());
3873                                 assert!(node_txn[0].input[0].witness[2].len() > 106); // must spend an htlc output
3874                                 assert_eq!(tx.input.len(), 1); // must spend a commitment tx
3875
3876                                 found_prev = true;
3877                                 break;
3878                         }
3879                 }
3880                 assert!(found_prev);
3881
3882                 let mut res = Vec::new();
3883                 mem::swap(&mut *node_txn, &mut res);
3884                 res
3885         }
3886
3887         fn get_announce_close_broadcast_events(nodes: &Vec<Node>, a: usize, b: usize) {
3888                 let events_1 = nodes[a].node.get_and_clear_pending_events();
3889                 assert_eq!(events_1.len(), 1);
3890                 let as_update = match events_1[0] {
3891                         Event::BroadcastChannelUpdate { ref msg } => {
3892                                 msg.clone()
3893                         },
3894                         _ => panic!("Unexpected event"),
3895                 };
3896
3897                 let events_2 = nodes[b].node.get_and_clear_pending_events();
3898                 assert_eq!(events_2.len(), 1);
3899                 let bs_update = match events_2[0] {
3900                         Event::BroadcastChannelUpdate { ref msg } => {
3901                                 msg.clone()
3902                         },
3903                         _ => panic!("Unexpected event"),
3904                 };
3905
3906                 for node in nodes {
3907                         node.router.handle_channel_update(&as_update).unwrap();
3908                         node.router.handle_channel_update(&bs_update).unwrap();
3909                 }
3910         }
3911
3912         #[test]
3913         fn channel_reserve_test() {
3914                 use util::rng;
3915                 use std::sync::atomic::Ordering;
3916                 use ln::msgs::HandleError;
3917
3918                 macro_rules! get_channel_value_stat {
3919                         ($node: expr, $channel_id: expr) => {{
3920                                 let chan_lock = $node.node.channel_state.lock().unwrap();
3921                                 let chan = chan_lock.by_id.get(&$channel_id).unwrap();
3922                                 chan.get_value_stat()
3923                         }}
3924                 }
3925
3926                 let mut nodes = create_network(3);
3927                 let chan_1 = create_announced_chan_between_nodes_with_value(&nodes, 0, 1, 1900, 1001);
3928                 let chan_2 = create_announced_chan_between_nodes_with_value(&nodes, 1, 2, 1900, 1001);
3929
3930                 let mut stat01 = get_channel_value_stat!(nodes[0], chan_1.2);
3931                 let mut stat11 = get_channel_value_stat!(nodes[1], chan_1.2);
3932
3933                 let mut stat12 = get_channel_value_stat!(nodes[1], chan_2.2);
3934                 let mut stat22 = get_channel_value_stat!(nodes[2], chan_2.2);
3935
3936                 macro_rules! get_route_and_payment_hash {
3937                         ($recv_value: expr) => {{
3938                                 let route = nodes[0].router.get_route(&nodes.last().unwrap().node.get_our_node_id(), None, &Vec::new(), $recv_value, TEST_FINAL_CLTV).unwrap();
3939                                 let (payment_preimage, payment_hash) = get_payment_preimage_hash!(nodes[0]);
3940                                 (route, payment_hash, payment_preimage)
3941                         }}
3942                 };
3943
3944                 macro_rules! expect_pending_htlcs_forwardable {
3945                         ($node: expr) => {{
3946                                 let events = $node.node.get_and_clear_pending_events();
3947                                 assert_eq!(events.len(), 1);
3948                                 match events[0] {
3949                                         Event::PendingHTLCsForwardable { .. } => { },
3950                                         _ => panic!("Unexpected event"),
3951                                 };
3952                                 $node.node.channel_state.lock().unwrap().next_forward = Instant::now();
3953                                 $node.node.process_pending_htlc_forwards();
3954                         }}
3955                 };
3956
3957                 macro_rules! expect_forward {
3958                         ($node: expr) => {{
3959                                 let mut events = $node.node.get_and_clear_pending_events();
3960                                 assert_eq!(events.len(), 1);
3961                                 check_added_monitors!($node, 1);
3962                                 let payment_event = SendEvent::from_event(events.remove(0));
3963                                 payment_event
3964                         }}
3965                 }
3966
3967                 macro_rules! expect_payment_received {
3968                         ($node: expr, $expected_payment_hash: expr, $expected_recv_value: expr) => {
3969                                 let events = $node.node.get_and_clear_pending_events();
3970                                 assert_eq!(events.len(), 1);
3971                                 match events[0] {
3972                                         Event::PaymentReceived { ref payment_hash, amt } => {
3973                                                 assert_eq!($expected_payment_hash, *payment_hash);
3974                                                 assert_eq!($expected_recv_value, amt);
3975                                         },
3976                                         _ => panic!("Unexpected event"),
3977                                 }
3978                         }
3979                 };
3980
3981                 let feemsat = 239; // somehow we know?
3982                 let total_fee_msat = (nodes.len() - 2) as u64 * 239;
3983
3984                 let recv_value_0 = stat01.their_max_htlc_value_in_flight_msat - total_fee_msat;
3985
3986                 // attempt to send amt_msat > their_max_htlc_value_in_flight_msat
3987                 {
3988                         let (route, our_payment_hash, _) = get_route_and_payment_hash!(recv_value_0 + 1);
3989                         assert!(route.hops.iter().rev().skip(1).all(|h| h.fee_msat == feemsat));
3990                         let err = nodes[0].node.send_payment(route, our_payment_hash).err().unwrap();
3991                         match err {
3992                                 APIError::RouteError{err} => assert_eq!(err, "Cannot send value that would put us over our max HTLC value in flight"),
3993                                 _ => panic!("Unknown error variants"),
3994                         }
3995                 }
3996
3997                 let mut htlc_id = 0;
3998                 // channel reserve is bigger than their_max_htlc_value_in_flight_msat so loop to deplete
3999                 // nodes[0]'s wealth
4000                 loop {
4001                         let amt_msat = recv_value_0 + total_fee_msat;
4002                         if stat01.value_to_self_msat - amt_msat < stat01.channel_reserve_msat {
4003                                 break;
4004                         }
4005                         send_payment(&nodes[0], &vec![&nodes[1], &nodes[2]][..], recv_value_0);
4006                         htlc_id += 1;
4007
4008                         let (stat01_, stat11_, stat12_, stat22_) = (
4009                                 get_channel_value_stat!(nodes[0], chan_1.2),
4010                                 get_channel_value_stat!(nodes[1], chan_1.2),
4011                                 get_channel_value_stat!(nodes[1], chan_2.2),
4012                                 get_channel_value_stat!(nodes[2], chan_2.2),
4013                         );
4014
4015                         assert_eq!(stat01_.value_to_self_msat, stat01.value_to_self_msat - amt_msat);
4016                         assert_eq!(stat11_.value_to_self_msat, stat11.value_to_self_msat + amt_msat);
4017                         assert_eq!(stat12_.value_to_self_msat, stat12.value_to_self_msat - (amt_msat - feemsat));
4018                         assert_eq!(stat22_.value_to_self_msat, stat22.value_to_self_msat + (amt_msat - feemsat));
4019                         stat01 = stat01_; stat11 = stat11_; stat12 = stat12_; stat22 = stat22_;
4020                 }
4021
4022                 {
4023                         let recv_value = stat01.value_to_self_msat - stat01.channel_reserve_msat - total_fee_msat;
4024                         // attempt to get channel_reserve violation
4025                         let (route, our_payment_hash, _) = get_route_and_payment_hash!(recv_value + 1);
4026                         let err = nodes[0].node.send_payment(route.clone(), our_payment_hash).err().unwrap();
4027                         match err {
4028                                 APIError::RouteError{err} => assert_eq!(err, "Cannot send value that would put us over our reserve value"),
4029                                 _ => panic!("Unknown error variants"),
4030                         }
4031                 }
4032
4033                 // adding pending output
4034                 let recv_value_1 = (stat01.value_to_self_msat - stat01.channel_reserve_msat - total_fee_msat)/2;
4035                 let amt_msat_1 = recv_value_1 + total_fee_msat;
4036
4037                 let (route_1, our_payment_hash_1, our_payment_preimage_1) = get_route_and_payment_hash!(recv_value_1);
4038                 let payment_event_1 = {
4039                         nodes[0].node.send_payment(route_1, our_payment_hash_1).unwrap();
4040                         check_added_monitors!(nodes[0], 1);
4041
4042                         let mut events = nodes[0].node.get_and_clear_pending_events();
4043                         assert_eq!(events.len(), 1);
4044                         SendEvent::from_event(events.remove(0))
4045                 };
4046                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event_1.msgs[0]).unwrap();
4047
4048                 // channel reserve test with htlc pending output > 0
4049                 let recv_value_2 = stat01.value_to_self_msat - amt_msat_1 - stat01.channel_reserve_msat - total_fee_msat;
4050                 {
4051                         let (route, our_payment_hash, _) = get_route_and_payment_hash!(recv_value_2 + 1);
4052                         match nodes[0].node.send_payment(route, our_payment_hash).err().unwrap() {
4053                                 APIError::RouteError{err} => assert_eq!(err, "Cannot send value that would put us over our reserve value"),
4054                                 _ => panic!("Unknown error variants"),
4055                         }
4056                 }
4057
4058                 {
4059                         // test channel_reserve test on nodes[1] side
4060                         let (route, our_payment_hash, _) = get_route_and_payment_hash!(recv_value_2 + 1);
4061
4062                         // Need to manually create update_add_htlc message to go around the channel reserve check in send_htlc()
4063                         let secp_ctx = Secp256k1::new();
4064                         let session_priv = SecretKey::from_slice(&secp_ctx, &{
4065                                 let mut session_key = [0; 32];
4066                                 rng::fill_bytes(&mut session_key);
4067                                 session_key
4068                         }).expect("RNG is bad!");
4069
4070                         let cur_height = nodes[0].node.latest_block_height.load(Ordering::Acquire) as u32 + 1;
4071                         let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
4072                         let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route, cur_height).unwrap();
4073                         let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, &our_payment_hash);
4074                         let msg = msgs::UpdateAddHTLC {
4075                                 channel_id: chan_1.2,
4076                                 htlc_id,
4077                                 amount_msat: htlc_msat,
4078                                 payment_hash: our_payment_hash,
4079                                 cltv_expiry: htlc_cltv,
4080                                 onion_routing_packet: onion_packet,
4081                         };
4082
4083                         let err = nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &msg).err().unwrap();
4084                         match err {
4085                                 HandleError{err, .. } => assert_eq!(err, "Remote HTLC add would put them over their reserve value"),
4086                         }
4087                 }
4088
4089                 // split the rest to test holding cell
4090                 let recv_value_21 = recv_value_2/2;
4091                 let recv_value_22 = recv_value_2 - recv_value_21 - total_fee_msat;
4092                 {
4093                         let stat = get_channel_value_stat!(nodes[0], chan_1.2);
4094                         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);
4095                 }
4096
4097                 // now see if they go through on both sides
4098                 let (route_21, our_payment_hash_21, our_payment_preimage_21) = get_route_and_payment_hash!(recv_value_21);
4099                 // but this will stuck in the holding cell
4100                 nodes[0].node.send_payment(route_21, our_payment_hash_21).unwrap();
4101                 check_added_monitors!(nodes[0], 0);
4102                 let events = nodes[0].node.get_and_clear_pending_events();
4103                 assert_eq!(events.len(), 0);
4104
4105                 // test with outbound holding cell amount > 0
4106                 {
4107                         let (route, our_payment_hash, _) = get_route_and_payment_hash!(recv_value_22+1);
4108                         match nodes[0].node.send_payment(route, our_payment_hash).err().unwrap() {
4109                                 APIError::RouteError{err} => assert_eq!(err, "Cannot send value that would put us over our reserve value"),
4110                                 _ => panic!("Unknown error variants"),
4111                         }
4112                 }
4113
4114                 let (route_22, our_payment_hash_22, our_payment_preimage_22) = get_route_and_payment_hash!(recv_value_22);
4115                 // this will also stuck in the holding cell
4116                 nodes[0].node.send_payment(route_22, our_payment_hash_22).unwrap();
4117                 check_added_monitors!(nodes[0], 0);
4118                 let events = nodes[0].node.get_and_clear_pending_events();
4119                 assert_eq!(events.len(), 0);
4120
4121                 // flush the pending htlc
4122                 let (as_revoke_and_ack, as_commitment_signed) = nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &payment_event_1.commitment_msg).unwrap();
4123                 check_added_monitors!(nodes[1], 1);
4124
4125                 let commitment_update_2 = nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &as_revoke_and_ack).unwrap().unwrap();
4126                 check_added_monitors!(nodes[0], 1);
4127                 let (bs_revoke_and_ack, bs_none) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &as_commitment_signed.unwrap()).unwrap();
4128                 assert!(bs_none.is_none());
4129                 check_added_monitors!(nodes[0], 1);
4130                 assert!(nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &bs_revoke_and_ack).unwrap().is_none());
4131                 check_added_monitors!(nodes[1], 1);
4132
4133                 expect_pending_htlcs_forwardable!(nodes[1]);
4134
4135                 let ref payment_event_11 = expect_forward!(nodes[1]);
4136                 nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event_11.msgs[0]).unwrap();
4137                 commitment_signed_dance!(nodes[2], nodes[1], payment_event_11.commitment_msg, false);
4138
4139                 expect_pending_htlcs_forwardable!(nodes[2]);
4140                 expect_payment_received!(nodes[2], our_payment_hash_1, recv_value_1);
4141
4142                 // flush the htlcs in the holding cell
4143                 assert_eq!(commitment_update_2.update_add_htlcs.len(), 2);
4144                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &commitment_update_2.update_add_htlcs[0]).unwrap();
4145                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &commitment_update_2.update_add_htlcs[1]).unwrap();
4146                 commitment_signed_dance!(nodes[1], nodes[0], &commitment_update_2.commitment_signed, false);
4147                 expect_pending_htlcs_forwardable!(nodes[1]);
4148
4149                 let ref payment_event_3 = expect_forward!(nodes[1]);
4150                 assert_eq!(payment_event_3.msgs.len(), 2);
4151                 nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event_3.msgs[0]).unwrap();
4152                 nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event_3.msgs[1]).unwrap();
4153
4154                 commitment_signed_dance!(nodes[2], nodes[1], &payment_event_3.commitment_msg, false);
4155                 expect_pending_htlcs_forwardable!(nodes[2]);
4156
4157                 let events = nodes[2].node.get_and_clear_pending_events();
4158                 assert_eq!(events.len(), 2);
4159                 match events[0] {
4160                         Event::PaymentReceived { ref payment_hash, amt } => {
4161                                 assert_eq!(our_payment_hash_21, *payment_hash);
4162                                 assert_eq!(recv_value_21, amt);
4163                         },
4164                         _ => panic!("Unexpected event"),
4165                 }
4166                 match events[1] {
4167                         Event::PaymentReceived { ref payment_hash, amt } => {
4168                                 assert_eq!(our_payment_hash_22, *payment_hash);
4169                                 assert_eq!(recv_value_22, amt);
4170                         },
4171                         _ => panic!("Unexpected event"),
4172                 }
4173
4174                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), our_payment_preimage_1);
4175                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), our_payment_preimage_21);
4176                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), our_payment_preimage_22);
4177
4178                 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);
4179                 let stat0 = get_channel_value_stat!(nodes[0], chan_1.2);
4180                 assert_eq!(stat0.value_to_self_msat, expected_value_to_self);
4181                 assert_eq!(stat0.value_to_self_msat, stat0.channel_reserve_msat);
4182
4183                 let stat2 = get_channel_value_stat!(nodes[2], chan_2.2);
4184                 assert_eq!(stat2.value_to_self_msat, stat22.value_to_self_msat + recv_value_1 + recv_value_21 + recv_value_22);
4185         }
4186
4187         #[test]
4188         fn channel_monitor_network_test() {
4189                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
4190                 // tests that ChannelMonitor is able to recover from various states.
4191                 let nodes = create_network(5);
4192
4193                 // Create some initial channels
4194                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
4195                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
4196                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
4197                 let chan_4 = create_announced_chan_between_nodes(&nodes, 3, 4);
4198
4199                 // Rebalance the network a bit by relaying one payment through all the channels...
4200                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
4201                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
4202                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
4203                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
4204
4205                 // Simple case with no pending HTLCs:
4206                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), true);
4207                 {
4208                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_1, None, HTLCType::NONE);
4209                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4210                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
4211                         test_txn_broadcast(&nodes[0], &chan_1, None, HTLCType::NONE);
4212                 }
4213                 get_announce_close_broadcast_events(&nodes, 0, 1);
4214                 assert_eq!(nodes[0].node.list_channels().len(), 0);
4215                 assert_eq!(nodes[1].node.list_channels().len(), 1);
4216
4217                 // One pending HTLC is discarded by the force-close:
4218                 let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 3000000).0;
4219
4220                 // Simple case of one pending HTLC to HTLC-Timeout
4221                 nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), true);
4222                 {
4223                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::TIMEOUT);
4224                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4225                         nodes[2].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
4226                         test_txn_broadcast(&nodes[2], &chan_2, None, HTLCType::NONE);
4227                 }
4228                 get_announce_close_broadcast_events(&nodes, 1, 2);
4229                 assert_eq!(nodes[1].node.list_channels().len(), 0);
4230                 assert_eq!(nodes[2].node.list_channels().len(), 1);
4231
4232                 macro_rules! claim_funds {
4233                         ($node: expr, $prev_node: expr, $preimage: expr) => {
4234                                 {
4235                                         assert!($node.node.claim_funds($preimage));
4236                                         check_added_monitors!($node, 1);
4237
4238                                         let events = $node.node.get_and_clear_pending_events();
4239                                         assert_eq!(events.len(), 1);
4240                                         match events[0] {
4241                                                 Event::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fail_htlcs, .. } } => {
4242                                                         assert!(update_add_htlcs.is_empty());
4243                                                         assert!(update_fail_htlcs.is_empty());
4244                                                         assert_eq!(*node_id, $prev_node.node.get_our_node_id());
4245                                                 },
4246                                                 _ => panic!("Unexpected event"),
4247                                         };
4248                                 }
4249                         }
4250                 }
4251
4252                 // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
4253                 // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
4254                 nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
4255                 {
4256                         let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
4257
4258                         // Claim the payment on nodes[3], giving it knowledge of the preimage
4259                         claim_funds!(nodes[3], nodes[2], payment_preimage_1);
4260
4261                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4262                         nodes[3].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, 1);
4263
4264                         check_preimage_claim(&nodes[3], &node_txn);
4265                 }
4266                 get_announce_close_broadcast_events(&nodes, 2, 3);
4267                 assert_eq!(nodes[2].node.list_channels().len(), 0);
4268                 assert_eq!(nodes[3].node.list_channels().len(), 1);
4269
4270                 // One pending HTLC to time out:
4271                 let payment_preimage_2 = route_payment(&nodes[3], &vec!(&nodes[4])[..], 3000000).0;
4272
4273                 {
4274                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4275                         nodes[3].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
4276                         for i in 2..TEST_FINAL_CLTV - 3 {
4277                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4278                                 nodes[3].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
4279                         }
4280
4281                         let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
4282
4283                         // Claim the payment on nodes[4], giving it knowledge of the preimage
4284                         claim_funds!(nodes[4], nodes[3], payment_preimage_2);
4285
4286                         header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4287                         nodes[4].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
4288                         for i in 2..TEST_FINAL_CLTV - 3 {
4289                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4290                                 nodes[4].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
4291                         }
4292
4293                         test_txn_broadcast(&nodes[4], &chan_4, None, HTLCType::SUCCESS);
4294
4295                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4296                         nodes[4].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, TEST_FINAL_CLTV - 5);
4297
4298                         check_preimage_claim(&nodes[4], &node_txn);
4299                 }
4300                 get_announce_close_broadcast_events(&nodes, 3, 4);
4301                 assert_eq!(nodes[3].node.list_channels().len(), 0);
4302                 assert_eq!(nodes[4].node.list_channels().len(), 0);
4303
4304                 // Create some new channels:
4305                 let chan_5 = create_announced_chan_between_nodes(&nodes, 0, 1);
4306
4307                 // A pending HTLC which will be revoked:
4308                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
4309                 // Get the will-be-revoked local txn from nodes[0]
4310                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.iter().next().unwrap().1.last_local_commitment_txn.clone();
4311                 assert_eq!(revoked_local_txn.len(), 2); // First commitment tx, then HTLC tx
4312                 assert_eq!(revoked_local_txn[0].input.len(), 1);
4313                 assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan_5.3.txid());
4314                 assert_eq!(revoked_local_txn[0].output.len(), 2); // Only HTLC and output back to 0 are present
4315                 assert_eq!(revoked_local_txn[1].input.len(), 1);
4316                 assert_eq!(revoked_local_txn[1].input[0].previous_output.txid, revoked_local_txn[0].txid());
4317                 assert_eq!(revoked_local_txn[1].input[0].witness.last().unwrap().len(), 133); // HTLC-Timeout
4318                 // Revoke the old state
4319                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
4320
4321                 {
4322                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4323                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
4324                         {
4325                                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
4326                                 assert_eq!(node_txn.len(), 3);
4327                                 assert_eq!(node_txn.pop().unwrap(), node_txn[0]); // An outpoint registration will result in a 2nd block_connected
4328                                 assert_eq!(node_txn[0].input.len(), 2); // We should claim the revoked output and the HTLC output
4329
4330                                 check_spends!(node_txn[0], revoked_local_txn[0].clone());
4331                                 node_txn.swap_remove(0);
4332                         }
4333                         test_txn_broadcast(&nodes[1], &chan_5, None, HTLCType::NONE);
4334
4335                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
4336                         let node_txn = test_txn_broadcast(&nodes[0], &chan_5, Some(revoked_local_txn[0].clone()), HTLCType::TIMEOUT);
4337                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4338                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[1].clone()] }, 1);
4339                         test_revoked_htlc_claim_txn_broadcast(&nodes[1], node_txn[1].clone());
4340                 }
4341                 get_announce_close_broadcast_events(&nodes, 0, 1);
4342                 assert_eq!(nodes[0].node.list_channels().len(), 0);
4343                 assert_eq!(nodes[1].node.list_channels().len(), 0);
4344         }
4345
4346         #[test]
4347         fn revoked_output_claim() {
4348                 // Simple test to ensure a node will claim a revoked output when a stale remote commitment
4349                 // transaction is broadcast by its counterparty
4350                 let nodes = create_network(2);
4351                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
4352                 // node[0] is gonna to revoke an old state thus node[1] should be able to claim the revoked output
4353                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan_1.2).unwrap().last_local_commitment_txn.clone();
4354                 assert_eq!(revoked_local_txn.len(), 1);
4355                 // Only output is the full channel value back to nodes[0]:
4356                 assert_eq!(revoked_local_txn[0].output.len(), 1);
4357                 // Send a payment through, updating everyone's latest commitment txn
4358                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 5000000);
4359
4360                 // Inform nodes[1] that nodes[0] broadcast a stale tx
4361                 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4362                 nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
4363                 let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
4364                 assert_eq!(node_txn.len(), 3); // nodes[1] will broadcast justice tx twice, and its own local state once
4365
4366                 assert_eq!(node_txn[0], node_txn[2]);
4367
4368                 check_spends!(node_txn[0], revoked_local_txn[0].clone());
4369                 check_spends!(node_txn[1], chan_1.3.clone());
4370
4371                 // Inform nodes[0] that a watchtower cheated on its behalf, so it will force-close the chan
4372                 nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
4373                 get_announce_close_broadcast_events(&nodes, 0, 1);
4374         }
4375
4376         #[test]
4377         fn claim_htlc_outputs_shared_tx() {
4378                 // Node revoked old state, htlcs haven't time out yet, claim them in shared justice tx
4379                 let nodes = create_network(2);
4380
4381                 // Create some new channel:
4382                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
4383
4384                 // Rebalance the network to generate htlc in the two directions
4385                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
4386                 // 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
4387                 let payment_preimage_1 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
4388                 let _payment_preimage_2 = route_payment(&nodes[1], &vec!(&nodes[0])[..], 3000000).0;
4389
4390                 // Get the will-be-revoked local txn from node[0]
4391                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan_1.2).unwrap().last_local_commitment_txn.clone();
4392                 assert_eq!(revoked_local_txn.len(), 2); // commitment tx + 1 HTLC-Timeout tx
4393                 assert_eq!(revoked_local_txn[0].input.len(), 1);
4394                 assert_eq!(revoked_local_txn[0].input[0].previous_output.txid, chan_1.3.txid());
4395                 assert_eq!(revoked_local_txn[1].input.len(), 1);
4396                 assert_eq!(revoked_local_txn[1].input[0].previous_output.txid, revoked_local_txn[0].txid());
4397                 assert_eq!(revoked_local_txn[1].input[0].witness.last().unwrap().len(), 133); // HTLC-Timeout
4398                 check_spends!(revoked_local_txn[1], revoked_local_txn[0].clone());
4399
4400                 //Revoke the old state
4401                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_1);
4402
4403                 {
4404                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4405
4406                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
4407
4408                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
4409                         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
4410                         assert_eq!(node_txn.len(), 4);
4411
4412                         assert_eq!(node_txn[0].input.len(), 3); // Claim the revoked output + both revoked HTLC outputs
4413                         check_spends!(node_txn[0], revoked_local_txn[0].clone());
4414
4415                         assert_eq!(node_txn[0], node_txn[3]); // justice tx is duplicated due to block re-scanning
4416
4417                         let mut witness_lens = BTreeSet::new();
4418                         witness_lens.insert(node_txn[0].input[0].witness.last().unwrap().len());
4419                         witness_lens.insert(node_txn[0].input[1].witness.last().unwrap().len());
4420                         witness_lens.insert(node_txn[0].input[2].witness.last().unwrap().len());
4421                         assert_eq!(witness_lens.len(), 3);
4422                         assert_eq!(*witness_lens.iter().skip(0).next().unwrap(), 77); // revoked to_local
4423                         assert_eq!(*witness_lens.iter().skip(1).next().unwrap(), 133); // revoked offered HTLC
4424                         assert_eq!(*witness_lens.iter().skip(2).next().unwrap(), 138); // revoked received HTLC
4425
4426                         // Next nodes[1] broadcasts its current local tx state:
4427                         assert_eq!(node_txn[1].input.len(), 1);
4428                         assert_eq!(node_txn[1].input[0].previous_output.txid, chan_1.3.txid()); //Spending funding tx unique txouput, tx broadcasted by ChannelManager
4429
4430                         assert_eq!(node_txn[2].input.len(), 1);
4431                         let witness_script = node_txn[2].clone().input[0].witness.pop().unwrap();
4432                         assert_eq!(witness_script.len(), 133); //Spending an offered htlc output
4433                         assert_eq!(node_txn[2].input[0].previous_output.txid, node_txn[1].txid());
4434                         assert_ne!(node_txn[2].input[0].previous_output.txid, node_txn[0].input[0].previous_output.txid);
4435                         assert_ne!(node_txn[2].input[0].previous_output.txid, node_txn[0].input[1].previous_output.txid);
4436                 }
4437                 get_announce_close_broadcast_events(&nodes, 0, 1);
4438                 assert_eq!(nodes[0].node.list_channels().len(), 0);
4439                 assert_eq!(nodes[1].node.list_channels().len(), 0);
4440         }
4441
4442         #[test]
4443         fn claim_htlc_outputs_single_tx() {
4444                 // Node revoked old state, htlcs have timed out, claim each of them in separated justice tx
4445                 let nodes = create_network(2);
4446
4447                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
4448
4449                 // Rebalance the network to generate htlc in the two directions
4450                 send_payment(&nodes[0], &vec!(&nodes[1])[..], 8000000);
4451                 // 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
4452                 // time as two different claim transactions as we're gonna to timeout htlc with given a high current height
4453                 let payment_preimage_1 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
4454                 let _payment_preimage_2 = route_payment(&nodes[1], &vec!(&nodes[0])[..], 3000000).0;
4455
4456                 // Get the will-be-revoked local txn from node[0]
4457                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.get(&chan_1.2).unwrap().last_local_commitment_txn.clone();
4458
4459                 //Revoke the old state
4460                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_1);
4461
4462                 {
4463                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4464
4465                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 200);
4466
4467                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 200);
4468                         let node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
4469                         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)
4470
4471                         assert_eq!(node_txn[0], node_txn[7]);
4472                         assert_eq!(node_txn[1], node_txn[8]);
4473                         assert_eq!(node_txn[2], node_txn[9]);
4474                         assert_eq!(node_txn[3], node_txn[10]);
4475                         assert_eq!(node_txn[4], node_txn[11]);
4476                         assert_eq!(node_txn[3], node_txn[5]); //local commitment tx + htlc timeout tx broadcated by ChannelManger
4477                         assert_eq!(node_txn[4], node_txn[6]);
4478
4479                         assert_eq!(node_txn[0].input.len(), 1);
4480                         assert_eq!(node_txn[1].input.len(), 1);
4481                         assert_eq!(node_txn[2].input.len(), 1);
4482
4483                         let mut revoked_tx_map = HashMap::new();
4484                         revoked_tx_map.insert(revoked_local_txn[0].txid(), revoked_local_txn[0].clone());
4485                         node_txn[0].verify(&revoked_tx_map).unwrap();
4486                         node_txn[1].verify(&revoked_tx_map).unwrap();
4487                         node_txn[2].verify(&revoked_tx_map).unwrap();
4488
4489                         let mut witness_lens = BTreeSet::new();
4490                         witness_lens.insert(node_txn[0].input[0].witness.last().unwrap().len());
4491                         witness_lens.insert(node_txn[1].input[0].witness.last().unwrap().len());
4492                         witness_lens.insert(node_txn[2].input[0].witness.last().unwrap().len());
4493                         assert_eq!(witness_lens.len(), 3);
4494                         assert_eq!(*witness_lens.iter().skip(0).next().unwrap(), 77); // revoked to_local
4495                         assert_eq!(*witness_lens.iter().skip(1).next().unwrap(), 133); // revoked offered HTLC
4496                         assert_eq!(*witness_lens.iter().skip(2).next().unwrap(), 138); // revoked received HTLC
4497
4498                         assert_eq!(node_txn[3].input.len(), 1);
4499                         check_spends!(node_txn[3], chan_1.3.clone());
4500
4501                         assert_eq!(node_txn[4].input.len(), 1);
4502                         let witness_script = node_txn[4].input[0].witness.last().unwrap();
4503                         assert_eq!(witness_script.len(), 133); //Spending an offered htlc output
4504                         assert_eq!(node_txn[4].input[0].previous_output.txid, node_txn[3].txid());
4505                         assert_ne!(node_txn[4].input[0].previous_output.txid, node_txn[0].input[0].previous_output.txid);
4506                         assert_ne!(node_txn[4].input[0].previous_output.txid, node_txn[1].input[0].previous_output.txid);
4507                 }
4508                 get_announce_close_broadcast_events(&nodes, 0, 1);
4509                 assert_eq!(nodes[0].node.list_channels().len(), 0);
4510                 assert_eq!(nodes[1].node.list_channels().len(), 0);
4511         }
4512
4513         #[test]
4514         fn test_htlc_ignore_latest_remote_commitment() {
4515                 // Test that HTLC transactions spending the latest remote commitment transaction are simply
4516                 // ignored if we cannot claim them. This originally tickled an invalid unwrap().
4517                 let nodes = create_network(2);
4518                 create_announced_chan_between_nodes(&nodes, 0, 1);
4519
4520                 route_payment(&nodes[0], &[&nodes[1]], 10000000);
4521                 nodes[0].node.force_close_channel(&nodes[0].node.list_channels()[0].channel_id);
4522                 {
4523                         let events = nodes[0].node.get_and_clear_pending_events();
4524                         assert_eq!(events.len(), 1);
4525                         match events[0] {
4526                                 Event::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
4527                                         assert_eq!(flags & 0b10, 0b10);
4528                                 },
4529                                 _ => panic!("Unexpected event"),
4530                         }
4531                 }
4532
4533                 let node_txn = nodes[0].tx_broadcaster.txn_broadcasted.lock().unwrap();
4534                 assert_eq!(node_txn.len(), 2);
4535
4536                 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4537                 nodes[1].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[0], &node_txn[1]], &[1; 2]);
4538
4539                 {
4540                         let events = nodes[1].node.get_and_clear_pending_events();
4541                         assert_eq!(events.len(), 1);
4542                         match events[0] {
4543                                 Event::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
4544                                         assert_eq!(flags & 0b10, 0b10);
4545                                 },
4546                                 _ => panic!("Unexpected event"),
4547                         }
4548                 }
4549
4550                 // Duplicate the block_connected call since this may happen due to other listeners
4551                 // registering new transactions
4552                 nodes[1].chain_monitor.block_connected_checked(&header, 1, &[&node_txn[0], &node_txn[1]], &[1; 2]);
4553         }
4554
4555         #[test]
4556         fn test_force_close_fail_back() {
4557                 // Check which HTLCs are failed-backwards on channel force-closure
4558                 let mut nodes = create_network(3);
4559                 create_announced_chan_between_nodes(&nodes, 0, 1);
4560                 create_announced_chan_between_nodes(&nodes, 1, 2);
4561
4562                 let route = nodes[0].router.get_route(&nodes[2].node.get_our_node_id(), None, &Vec::new(), 1000000, 42).unwrap();
4563
4564                 let (our_payment_preimage, our_payment_hash) = get_payment_preimage_hash!(nodes[0]);
4565
4566                 let mut payment_event = {
4567                         nodes[0].node.send_payment(route, our_payment_hash).unwrap();
4568                         check_added_monitors!(nodes[0], 1);
4569
4570                         let mut events = nodes[0].node.get_and_clear_pending_events();
4571                         assert_eq!(events.len(), 1);
4572                         SendEvent::from_event(events.remove(0))
4573                 };
4574
4575                 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
4576                 commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
4577
4578                 let events_1 = nodes[1].node.get_and_clear_pending_events();
4579                 assert_eq!(events_1.len(), 1);
4580                 match events_1[0] {
4581                         Event::PendingHTLCsForwardable { .. } => { },
4582                         _ => panic!("Unexpected event"),
4583                 };
4584
4585                 nodes[1].node.channel_state.lock().unwrap().next_forward = Instant::now();
4586                 nodes[1].node.process_pending_htlc_forwards();
4587
4588                 let mut events_2 = nodes[1].node.get_and_clear_pending_events();
4589                 assert_eq!(events_2.len(), 1);
4590                 payment_event = SendEvent::from_event(events_2.remove(0));
4591                 assert_eq!(payment_event.msgs.len(), 1);
4592
4593                 check_added_monitors!(nodes[1], 1);
4594                 nodes[2].node.handle_update_add_htlc(&nodes[1].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
4595                 nodes[2].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
4596                 check_added_monitors!(nodes[2], 1);
4597
4598                 // nodes[2] now has the latest commitment transaction, but hasn't revoked its previous
4599                 // state or updated nodes[1]' state. Now force-close and broadcast that commitment/HTLC
4600                 // transaction and ensure nodes[1] doesn't fail-backwards (this was originally a bug!).
4601
4602                 nodes[2].node.force_close_channel(&payment_event.commitment_msg.channel_id);
4603                 let events_3 = nodes[2].node.get_and_clear_pending_events();
4604                 assert_eq!(events_3.len(), 1);
4605                 match events_3[0] {
4606                         Event::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
4607                                 assert_eq!(flags & 0b10, 0b10);
4608                         },
4609                         _ => panic!("Unexpected event"),
4610                 }
4611
4612                 let tx = {
4613                         let mut node_txn = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap();
4614                         // Note that we don't bother broadcasting the HTLC-Success transaction here as we don't
4615                         // have a use for it unless nodes[2] learns the preimage somehow, the funds will go
4616                         // back to nodes[1] upon timeout otherwise.
4617                         assert_eq!(node_txn.len(), 1);
4618                         node_txn.remove(0)
4619                 };
4620
4621                 let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4622                 nodes[1].chain_monitor.block_connected_checked(&header, 1, &[&tx], &[1]);
4623
4624                 let events_4 = nodes[1].node.get_and_clear_pending_events();
4625                 // Note no UpdateHTLCs event here from nodes[1] to nodes[0]!
4626                 assert_eq!(events_4.len(), 1);
4627                 match events_4[0] {
4628                         Event::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
4629                                 assert_eq!(flags & 0b10, 0b10);
4630                         },
4631                         _ => panic!("Unexpected event"),
4632                 }
4633
4634                 // Now check that if we add the preimage to ChannelMonitor it broadcasts our HTLC-Success..
4635                 {
4636                         let mut monitors = nodes[2].chan_monitor.simple_monitor.monitors.lock().unwrap();
4637                         monitors.get_mut(&OutPoint::new(Sha256dHash::from(&payment_event.commitment_msg.channel_id[..]), 0)).unwrap()
4638                                 .provide_payment_preimage(&our_payment_hash, &our_payment_preimage);
4639                 }
4640                 nodes[2].chain_monitor.block_connected_checked(&header, 1, &[&tx], &[1]);
4641                 let node_txn = nodes[2].tx_broadcaster.txn_broadcasted.lock().unwrap();
4642                 assert_eq!(node_txn.len(), 1);
4643                 assert_eq!(node_txn[0].input.len(), 1);
4644                 assert_eq!(node_txn[0].input[0].previous_output.txid, tx.txid());
4645                 assert_eq!(node_txn[0].lock_time, 0); // Must be an HTLC-Success
4646                 assert_eq!(node_txn[0].input[0].witness.len(), 5); // Must be an HTLC-Success
4647
4648                 check_spends!(node_txn[0], tx);
4649         }
4650
4651         #[test]
4652         fn test_unconf_chan() {
4653                 // After creating a chan between nodes, we disconnect all blocks previously seen to force a channel close on nodes[0] side
4654                 let nodes = create_network(2);
4655                 create_announced_chan_between_nodes(&nodes, 0, 1);
4656
4657                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
4658                 assert_eq!(channel_state.by_id.len(), 1);
4659                 assert_eq!(channel_state.short_to_id.len(), 1);
4660                 mem::drop(channel_state);
4661
4662                 let mut headers = Vec::new();
4663                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4664                 headers.push(header.clone());
4665                 for _i in 2..100 {
4666                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
4667                         headers.push(header.clone());
4668                 }
4669                 while !headers.is_empty() {
4670                         nodes[0].node.block_disconnected(&headers.pop().unwrap());
4671                 }
4672                 {
4673                         let events = nodes[0].node.get_and_clear_pending_events();
4674                         assert_eq!(events.len(), 1);
4675                         match events[0] {
4676                                 Event::BroadcastChannelUpdate { msg: msgs::ChannelUpdate { contents: msgs::UnsignedChannelUpdate { flags, .. }, .. } } => {
4677                                         assert_eq!(flags & 0b10, 0b10);
4678                                 },
4679                                 _ => panic!("Unexpected event"),
4680                         }
4681                 }
4682                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
4683                 assert_eq!(channel_state.by_id.len(), 0);
4684                 assert_eq!(channel_state.short_to_id.len(), 0);
4685         }
4686
4687         /// pending_htlc_adds includes both the holding cell and in-flight update_add_htlcs, whereas
4688         /// for claims/fails they are separated out.
4689         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)) {
4690                 let reestablish_1 = node_a.node.peer_connected(&node_b.node.get_our_node_id());
4691                 let reestablish_2 = node_b.node.peer_connected(&node_a.node.get_our_node_id());
4692
4693                 let mut resp_1 = Vec::new();
4694                 for msg in reestablish_1 {
4695                         resp_1.push(node_b.node.handle_channel_reestablish(&node_a.node.get_our_node_id(), &msg).unwrap());
4696                 }
4697                 if pending_cell_htlc_claims.0 != 0 || pending_cell_htlc_fails.0 != 0 {
4698                         check_added_monitors!(node_b, 1);
4699                 } else {
4700                         check_added_monitors!(node_b, 0);
4701                 }
4702
4703                 let mut resp_2 = Vec::new();
4704                 for msg in reestablish_2 {
4705                         resp_2.push(node_a.node.handle_channel_reestablish(&node_b.node.get_our_node_id(), &msg).unwrap());
4706                 }
4707                 if pending_cell_htlc_claims.1 != 0 || pending_cell_htlc_fails.1 != 0 {
4708                         check_added_monitors!(node_a, 1);
4709                 } else {
4710                         check_added_monitors!(node_a, 0);
4711                 }
4712
4713                 // We dont yet support both needing updates, as that would require a different commitment dance:
4714                 assert!((pending_htlc_adds.0 == 0 && pending_htlc_claims.0 == 0 && pending_cell_htlc_claims.0 == 0 && pending_cell_htlc_fails.0 == 0) ||
4715                         (pending_htlc_adds.1 == 0 && pending_htlc_claims.1 == 0 && pending_cell_htlc_claims.1 == 0 && pending_cell_htlc_fails.1 == 0));
4716
4717                 for chan_msgs in resp_1.drain(..) {
4718                         if pre_all_htlcs {
4719                                 let a = node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), &chan_msgs.0.unwrap());
4720                                 let _announcement_sigs_opt = a.unwrap();
4721                                 //TODO: Test announcement_sigs re-sending when we've implemented it
4722                         } else {
4723                                 assert!(chan_msgs.0.is_none());
4724                         }
4725                         if pending_raa.0 {
4726                                 assert!(node_a.node.handle_revoke_and_ack(&node_b.node.get_our_node_id(), &chan_msgs.1.unwrap()).unwrap().is_none());
4727                                 check_added_monitors!(node_a, 1);
4728                         } else {
4729                                 assert!(chan_msgs.1.is_none());
4730                         }
4731                         if pending_htlc_adds.0 != 0 || pending_htlc_claims.0 != 0 || pending_cell_htlc_claims.0 != 0 || pending_cell_htlc_fails.0 != 0 {
4732                                 let commitment_update = chan_msgs.2.unwrap();
4733                                 if pending_htlc_adds.0 != -1 { // We use -1 to denote a response commitment_signed
4734                                         assert_eq!(commitment_update.update_add_htlcs.len(), pending_htlc_adds.0 as usize);
4735                                 } else {
4736                                         assert!(commitment_update.update_add_htlcs.is_empty());
4737                                 }
4738                                 assert_eq!(commitment_update.update_fulfill_htlcs.len(), pending_htlc_claims.0 + pending_cell_htlc_claims.0);
4739                                 assert_eq!(commitment_update.update_fail_htlcs.len(), pending_cell_htlc_fails.0);
4740                                 assert!(commitment_update.update_fail_malformed_htlcs.is_empty());
4741                                 for update_add in commitment_update.update_add_htlcs {
4742                                         node_a.node.handle_update_add_htlc(&node_b.node.get_our_node_id(), &update_add).unwrap();
4743                                 }
4744                                 for update_fulfill in commitment_update.update_fulfill_htlcs {
4745                                         node_a.node.handle_update_fulfill_htlc(&node_b.node.get_our_node_id(), &update_fulfill).unwrap();
4746                                 }
4747                                 for update_fail in commitment_update.update_fail_htlcs {
4748                                         node_a.node.handle_update_fail_htlc(&node_b.node.get_our_node_id(), &update_fail).unwrap();
4749                                 }
4750
4751                                 if pending_htlc_adds.0 != -1 { // We use -1 to denote a response commitment_signed
4752                                         commitment_signed_dance!(node_a, node_b, commitment_update.commitment_signed, false);
4753                                 } else {
4754                                         let (as_revoke_and_ack, as_commitment_signed) = node_a.node.handle_commitment_signed(&node_b.node.get_our_node_id(), &commitment_update.commitment_signed).unwrap();
4755                                         check_added_monitors!(node_a, 1);
4756                                         assert!(as_commitment_signed.is_none());
4757                                         assert!(node_b.node.handle_revoke_and_ack(&node_a.node.get_our_node_id(), &as_revoke_and_ack).unwrap().is_none());
4758                                         check_added_monitors!(node_b, 1);
4759                                 }
4760                         } else {
4761                                 assert!(chan_msgs.2.is_none());
4762                         }
4763                 }
4764
4765                 for chan_msgs in resp_2.drain(..) {
4766                         if pre_all_htlcs {
4767                                 let _announcement_sigs_opt = node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), &chan_msgs.0.unwrap()).unwrap();
4768                                 //TODO: Test announcement_sigs re-sending when we've implemented it
4769                         } else {
4770                                 assert!(chan_msgs.0.is_none());
4771                         }
4772                         if pending_raa.1 {
4773                                 assert!(node_b.node.handle_revoke_and_ack(&node_a.node.get_our_node_id(), &chan_msgs.1.unwrap()).unwrap().is_none());
4774                                 check_added_monitors!(node_b, 1);
4775                         } else {
4776                                 assert!(chan_msgs.1.is_none());
4777                         }
4778                         if pending_htlc_adds.1 != 0 || pending_htlc_claims.1 != 0 || pending_cell_htlc_claims.1 != 0 || pending_cell_htlc_fails.1 != 0 {
4779                                 let commitment_update = chan_msgs.2.unwrap();
4780                                 if pending_htlc_adds.1 != -1 { // We use -1 to denote a response commitment_signed
4781                                         assert_eq!(commitment_update.update_add_htlcs.len(), pending_htlc_adds.1 as usize);
4782                                 }
4783                                 assert_eq!(commitment_update.update_fulfill_htlcs.len(), pending_htlc_claims.0 + pending_cell_htlc_claims.0);
4784                                 assert_eq!(commitment_update.update_fail_htlcs.len(), pending_cell_htlc_fails.0);
4785                                 assert!(commitment_update.update_fail_malformed_htlcs.is_empty());
4786                                 for update_add in commitment_update.update_add_htlcs {
4787                                         node_b.node.handle_update_add_htlc(&node_a.node.get_our_node_id(), &update_add).unwrap();
4788                                 }
4789                                 for update_fulfill in commitment_update.update_fulfill_htlcs {
4790                                         node_b.node.handle_update_fulfill_htlc(&node_a.node.get_our_node_id(), &update_fulfill).unwrap();
4791                                 }
4792                                 for update_fail in commitment_update.update_fail_htlcs {
4793                                         node_b.node.handle_update_fail_htlc(&node_a.node.get_our_node_id(), &update_fail).unwrap();
4794                                 }
4795
4796                                 if pending_htlc_adds.1 != -1 { // We use -1 to denote a response commitment_signed
4797                                         commitment_signed_dance!(node_b, node_a, commitment_update.commitment_signed, false);
4798                                 } else {
4799                                         let (bs_revoke_and_ack, bs_commitment_signed) = node_b.node.handle_commitment_signed(&node_a.node.get_our_node_id(), &commitment_update.commitment_signed).unwrap();
4800                                         check_added_monitors!(node_b, 1);
4801                                         assert!(bs_commitment_signed.is_none());
4802                                         assert!(node_a.node.handle_revoke_and_ack(&node_b.node.get_our_node_id(), &bs_revoke_and_ack).unwrap().is_none());
4803                                         check_added_monitors!(node_a, 1);
4804                                 }
4805                         } else {
4806                                 assert!(chan_msgs.2.is_none());
4807                         }
4808                 }
4809         }
4810
4811         #[test]
4812         fn test_simple_peer_disconnect() {
4813                 // Test that we can reconnect when there are no lost messages
4814                 let nodes = create_network(3);
4815                 create_announced_chan_between_nodes(&nodes, 0, 1);
4816                 create_announced_chan_between_nodes(&nodes, 1, 2);
4817
4818                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
4819                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
4820                 reconnect_nodes(&nodes[0], &nodes[1], true, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
4821
4822                 let payment_preimage_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).0;
4823                 let payment_hash_2 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).1;
4824                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_hash_2);
4825                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_preimage_1);
4826
4827                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
4828                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
4829                 reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
4830
4831                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).0;
4832                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).0;
4833                 let payment_hash_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).1;
4834                 let payment_hash_6 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2])[..], 1000000).1;
4835
4836                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
4837                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
4838
4839                 claim_payment_along_route(&nodes[0], &vec!(&nodes[1], &nodes[2]), true, payment_preimage_3);
4840                 fail_payment_along_route(&nodes[0], &[&nodes[1], &nodes[2]], true, payment_hash_5);
4841
4842                 reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (1, 0), (1, 0), (false, false));
4843                 {
4844                         let events = nodes[0].node.get_and_clear_pending_events();
4845                         assert_eq!(events.len(), 2);
4846                         match events[0] {
4847                                 Event::PaymentSent { payment_preimage } => {
4848                                         assert_eq!(payment_preimage, payment_preimage_3);
4849                                 },
4850                                 _ => panic!("Unexpected event"),
4851                         }
4852                         match events[1] {
4853                                 Event::PaymentFailed { payment_hash } => {
4854                                         assert_eq!(payment_hash, payment_hash_5);
4855                                 },
4856                                 _ => panic!("Unexpected event"),
4857                         }
4858                 }
4859
4860                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_preimage_4);
4861                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2]), payment_hash_6);
4862         }
4863
4864         fn do_test_drop_messages_peer_disconnect(messages_delivered: u8) {
4865                 // Test that we can reconnect when in-flight HTLC updates get dropped
4866                 let mut nodes = create_network(2);
4867                 if messages_delivered == 0 {
4868                         create_chan_between_nodes_with_value_a(&nodes[0], &nodes[1], 100000, 10001);
4869                         // nodes[1] doesn't receive the funding_locked message (it'll be re-sent on reconnect)
4870                 } else {
4871                         create_announced_chan_between_nodes(&nodes, 0, 1);
4872                 }
4873
4874                 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();
4875                 let (payment_preimage_1, payment_hash_1) = get_payment_preimage_hash!(nodes[0]);
4876
4877                 let payment_event = {
4878                         nodes[0].node.send_payment(route.clone(), payment_hash_1).unwrap();
4879                         check_added_monitors!(nodes[0], 1);
4880
4881                         let mut events = nodes[0].node.get_and_clear_pending_events();
4882                         assert_eq!(events.len(), 1);
4883                         SendEvent::from_event(events.remove(0))
4884                 };
4885                 assert_eq!(nodes[1].node.get_our_node_id(), payment_event.node_id);
4886
4887                 if messages_delivered < 2 {
4888                         // Drop the payment_event messages, and let them get re-generated in reconnect_nodes!
4889                 } else {
4890                         nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
4891                         let (bs_revoke_and_ack, bs_commitment_signed) = nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
4892                         check_added_monitors!(nodes[1], 1);
4893
4894                         if messages_delivered >= 3 {
4895                                 assert!(nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_and_ack).unwrap().is_none());
4896                                 check_added_monitors!(nodes[0], 1);
4897
4898                                 if messages_delivered >= 4 {
4899                                         let (as_revoke_and_ack, as_commitment_signed) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_commitment_signed.unwrap()).unwrap();
4900                                         assert!(as_commitment_signed.is_none());
4901                                         check_added_monitors!(nodes[0], 1);
4902
4903                                         if messages_delivered >= 5 {
4904                                                 assert!(nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_and_ack).unwrap().is_none());
4905                                                 check_added_monitors!(nodes[1], 1);
4906                                         }
4907                                 }
4908                         }
4909                 }
4910
4911                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
4912                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
4913                 if messages_delivered < 2 {
4914                         // Even if the funding_locked messages get exchanged, as long as nothing further was
4915                         // received on either side, both sides will need to resend them.
4916                         reconnect_nodes(&nodes[0], &nodes[1], true, (0, 1), (0, 0), (0, 0), (0, 0), (false, false));
4917                 } else if messages_delivered == 2 {
4918                         // nodes[0] still wants its RAA + commitment_signed
4919                         reconnect_nodes(&nodes[0], &nodes[1], false, (-1, 0), (0, 0), (0, 0), (0, 0), (true, false));
4920                 } else if messages_delivered == 3 {
4921                         // nodes[0] still wants its commitment_signed
4922                         reconnect_nodes(&nodes[0], &nodes[1], false, (-1, 0), (0, 0), (0, 0), (0, 0), (false, false));
4923                 } else if messages_delivered == 4 {
4924                         // nodes[1] still wants its final RAA
4925                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, true));
4926                 } else if messages_delivered == 5 {
4927                         // Everything was delivered...
4928                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
4929                 }
4930
4931                 let events_1 = nodes[1].node.get_and_clear_pending_events();
4932                 assert_eq!(events_1.len(), 1);
4933                 match events_1[0] {
4934                         Event::PendingHTLCsForwardable { .. } => { },
4935                         _ => panic!("Unexpected event"),
4936                 };
4937
4938                 nodes[1].node.channel_state.lock().unwrap().next_forward = Instant::now();
4939                 nodes[1].node.process_pending_htlc_forwards();
4940
4941                 let events_2 = nodes[1].node.get_and_clear_pending_events();
4942                 assert_eq!(events_2.len(), 1);
4943                 match events_2[0] {
4944                         Event::PaymentReceived { ref payment_hash, amt } => {
4945                                 assert_eq!(payment_hash_1, *payment_hash);
4946                                 assert_eq!(amt, 1000000);
4947                         },
4948                         _ => panic!("Unexpected event"),
4949                 }
4950
4951                 nodes[1].node.claim_funds(payment_preimage_1);
4952                 check_added_monitors!(nodes[1], 1);
4953
4954                 let events_3 = nodes[1].node.get_and_clear_pending_events();
4955                 assert_eq!(events_3.len(), 1);
4956                 let (update_fulfill_htlc, commitment_signed) = match events_3[0] {
4957                         Event::UpdateHTLCs { ref node_id, ref updates } => {
4958                                 assert_eq!(*node_id, nodes[0].node.get_our_node_id());
4959                                 assert!(updates.update_add_htlcs.is_empty());
4960                                 assert!(updates.update_fail_htlcs.is_empty());
4961                                 assert_eq!(updates.update_fulfill_htlcs.len(), 1);
4962                                 assert!(updates.update_fail_malformed_htlcs.is_empty());
4963                                 assert!(updates.update_fee.is_none());
4964                                 (updates.update_fulfill_htlcs[0].clone(), updates.commitment_signed.clone())
4965                         },
4966                         _ => panic!("Unexpected event"),
4967                 };
4968
4969                 if messages_delivered >= 1 {
4970                         nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &update_fulfill_htlc).unwrap();
4971
4972                         let events_4 = nodes[0].node.get_and_clear_pending_events();
4973                         assert_eq!(events_4.len(), 1);
4974                         match events_4[0] {
4975                                 Event::PaymentSent { ref payment_preimage } => {
4976                                         assert_eq!(payment_preimage_1, *payment_preimage);
4977                                 },
4978                                 _ => panic!("Unexpected event"),
4979                         }
4980
4981                         if messages_delivered >= 2 {
4982                                 let (as_revoke_and_ack, as_commitment_signed) = nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &commitment_signed).unwrap();
4983                                 check_added_monitors!(nodes[0], 1);
4984
4985                                 if messages_delivered >= 3 {
4986                                         assert!(nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_revoke_and_ack).unwrap().is_none());
4987                                         check_added_monitors!(nodes[1], 1);
4988
4989                                         if messages_delivered >= 4 {
4990                                                 let (bs_revoke_and_ack, bs_commitment_signed) = nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_commitment_signed.unwrap()).unwrap();
4991                                                 assert!(bs_commitment_signed.is_none());
4992                                                 check_added_monitors!(nodes[1], 1);
4993
4994                                                 if messages_delivered >= 5 {
4995                                                         assert!(nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_revoke_and_ack).unwrap().is_none());
4996                                                         check_added_monitors!(nodes[0], 1);
4997                                                 }
4998                                         }
4999                                 }
5000                         }
5001                 }
5002
5003                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
5004                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
5005                 if messages_delivered < 2 {
5006                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (1, 0), (0, 0), (0, 0), (false, false));
5007                         //TODO: Deduplicate PaymentSent events, then enable this if:
5008                         //if messages_delivered < 1 {
5009                                 let events_4 = nodes[0].node.get_and_clear_pending_events();
5010                                 assert_eq!(events_4.len(), 1);
5011                                 match events_4[0] {
5012                                         Event::PaymentSent { ref payment_preimage } => {
5013                                                 assert_eq!(payment_preimage_1, *payment_preimage);
5014                                         },
5015                                         _ => panic!("Unexpected event"),
5016                                 }
5017                         //}
5018                 } else if messages_delivered == 2 {
5019                         // nodes[0] still wants its RAA + commitment_signed
5020                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, -1), (0, 0), (0, 0), (0, 0), (false, true));
5021                 } else if messages_delivered == 3 {
5022                         // nodes[0] still wants its commitment_signed
5023                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, -1), (0, 0), (0, 0), (0, 0), (false, false));
5024                 } else if messages_delivered == 4 {
5025                         // nodes[1] still wants its final RAA
5026                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (true, false));
5027                 } else if messages_delivered == 5 {
5028                         // Everything was delivered...
5029                         reconnect_nodes(&nodes[0], &nodes[1], false, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
5030                 }
5031
5032                 // Channel should still work fine...
5033                 let payment_preimage_2 = send_along_route(&nodes[0], route, &[&nodes[1]], 1000000).0;
5034                 claim_payment(&nodes[0], &[&nodes[1]], payment_preimage_2);
5035         }
5036
5037         #[test]
5038         fn test_drop_messages_peer_disconnect_a() {
5039                 do_test_drop_messages_peer_disconnect(0);
5040                 do_test_drop_messages_peer_disconnect(1);
5041                 do_test_drop_messages_peer_disconnect(2);
5042         }
5043
5044         #[test]
5045         fn test_drop_messages_peer_disconnect_b() {
5046                 do_test_drop_messages_peer_disconnect(3);
5047                 do_test_drop_messages_peer_disconnect(4);
5048                 do_test_drop_messages_peer_disconnect(5);
5049         }
5050
5051         #[test]
5052         fn test_funding_peer_disconnect() {
5053                 // Test that we can lock in our funding tx while disconnected
5054                 let nodes = create_network(2);
5055                 let tx = create_chan_between_nodes_with_value_init(&nodes[0], &nodes[1], 100000, 10001);
5056
5057                 nodes[0].node.peer_disconnected(&nodes[1].node.get_our_node_id(), false);
5058                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), false);
5059
5060                 confirm_transaction(&nodes[0].chain_monitor, &tx, tx.version);
5061                 let events_1 = nodes[0].node.get_and_clear_pending_events();
5062                 assert_eq!(events_1.len(), 1);
5063                 match events_1[0] {
5064                         Event::SendFundingLocked { ref node_id, msg: _, ref announcement_sigs } => {
5065                                 assert_eq!(*node_id, nodes[1].node.get_our_node_id());
5066                                 assert!(announcement_sigs.is_none());
5067                         },
5068                         _ => panic!("Unexpected event"),
5069                 }
5070
5071                 confirm_transaction(&nodes[1].chain_monitor, &tx, tx.version);
5072                 let events_2 = nodes[1].node.get_and_clear_pending_events();
5073                 assert_eq!(events_2.len(), 1);
5074                 match events_2[0] {
5075                         Event::SendFundingLocked { ref node_id, msg: _, ref announcement_sigs } => {
5076                                 assert_eq!(*node_id, nodes[0].node.get_our_node_id());
5077                                 assert!(announcement_sigs.is_none());
5078                         },
5079                         _ => panic!("Unexpected event"),
5080                 }
5081
5082                 reconnect_nodes(&nodes[0], &nodes[1], true, (0, 0), (0, 0), (0, 0), (0, 0), (false, false));
5083
5084                 // TODO: We shouldn't need to manually pass list_usable_chanels here once we support
5085                 // rebroadcasting announcement_signatures upon reconnect.
5086
5087                 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();
5088                 let (payment_preimage, _) = send_along_route(&nodes[0], route, &[&nodes[1]], 1000000);
5089                 claim_payment(&nodes[0], &[&nodes[1]], payment_preimage);
5090         }
5091
5092         #[test]
5093         fn test_invalid_channel_announcement() {
5094                 //Test BOLT 7 channel_announcement msg requirement for final node, gather data to build customed channel_announcement msgs
5095                 let secp_ctx = Secp256k1::new();
5096                 let nodes = create_network(2);
5097
5098                 let chan_announcement = create_chan_between_nodes(&nodes[0], &nodes[1]);
5099
5100                 let a_channel_lock = nodes[0].node.channel_state.lock().unwrap();
5101                 let b_channel_lock = nodes[1].node.channel_state.lock().unwrap();
5102                 let as_chan = a_channel_lock.by_id.get(&chan_announcement.3).unwrap();
5103                 let bs_chan = b_channel_lock.by_id.get(&chan_announcement.3).unwrap();
5104
5105                 let _ = nodes[0].router.handle_htlc_fail_channel_update(&msgs::HTLCFailChannelUpdate::ChannelClosed { short_channel_id : as_chan.get_short_channel_id().unwrap() } );
5106
5107                 let as_bitcoin_key = PublicKey::from_secret_key(&secp_ctx, &as_chan.get_local_keys().funding_key);
5108                 let bs_bitcoin_key = PublicKey::from_secret_key(&secp_ctx, &bs_chan.get_local_keys().funding_key);
5109
5110                 let as_network_key = nodes[0].node.get_our_node_id();
5111                 let bs_network_key = nodes[1].node.get_our_node_id();
5112
5113                 let were_node_one = as_bitcoin_key.serialize()[..] < bs_bitcoin_key.serialize()[..];
5114
5115                 let mut chan_announcement;
5116
5117                 macro_rules! dummy_unsigned_msg {
5118                         () => {
5119                                 msgs::UnsignedChannelAnnouncement {
5120                                         features: msgs::GlobalFeatures::new(),
5121                                         chain_hash: genesis_block(Network::Testnet).header.bitcoin_hash(),
5122                                         short_channel_id: as_chan.get_short_channel_id().unwrap(),
5123                                         node_id_1: if were_node_one { as_network_key } else { bs_network_key },
5124                                         node_id_2: if were_node_one { bs_network_key } else { as_network_key },
5125                                         bitcoin_key_1: if were_node_one { as_bitcoin_key } else { bs_bitcoin_key },
5126                                         bitcoin_key_2: if were_node_one { bs_bitcoin_key } else { as_bitcoin_key },
5127                                         excess_data: Vec::new(),
5128                                 };
5129                         }
5130                 }
5131
5132                 macro_rules! sign_msg {
5133                         ($unsigned_msg: expr) => {
5134                                 let msghash = Message::from_slice(&Sha256dHash::from_data(&$unsigned_msg.encode()[..])[..]).unwrap();
5135                                 let as_bitcoin_sig = secp_ctx.sign(&msghash, &as_chan.get_local_keys().funding_key);
5136                                 let bs_bitcoin_sig = secp_ctx.sign(&msghash, &bs_chan.get_local_keys().funding_key);
5137                                 let as_node_sig = secp_ctx.sign(&msghash, &nodes[0].node.our_network_key);
5138                                 let bs_node_sig = secp_ctx.sign(&msghash, &nodes[1].node.our_network_key);
5139                                 chan_announcement = msgs::ChannelAnnouncement {
5140                                         node_signature_1 : if were_node_one { as_node_sig } else { bs_node_sig},
5141                                         node_signature_2 : if were_node_one { bs_node_sig } else { as_node_sig},
5142                                         bitcoin_signature_1: if were_node_one { as_bitcoin_sig } else { bs_bitcoin_sig },
5143                                         bitcoin_signature_2 : if were_node_one { bs_bitcoin_sig } else { as_bitcoin_sig },
5144                                         contents: $unsigned_msg
5145                                 }
5146                         }
5147                 }
5148
5149                 let unsigned_msg = dummy_unsigned_msg!();
5150                 sign_msg!(unsigned_msg);
5151                 assert_eq!(nodes[0].router.handle_channel_announcement(&chan_announcement).unwrap(), true);
5152                 let _ = nodes[0].router.handle_htlc_fail_channel_update(&msgs::HTLCFailChannelUpdate::ChannelClosed { short_channel_id : as_chan.get_short_channel_id().unwrap() } );
5153
5154                 // Configured with Network::Testnet
5155                 let mut unsigned_msg = dummy_unsigned_msg!();
5156                 unsigned_msg.chain_hash = genesis_block(Network::Bitcoin).header.bitcoin_hash();
5157                 sign_msg!(unsigned_msg);
5158                 assert!(nodes[0].router.handle_channel_announcement(&chan_announcement).is_err());
5159
5160                 let mut unsigned_msg = dummy_unsigned_msg!();
5161                 unsigned_msg.chain_hash = Sha256dHash::from_data(&[1,2,3,4,5,6,7,8,9]);
5162                 sign_msg!(unsigned_msg);
5163                 assert!(nodes[0].router.handle_channel_announcement(&chan_announcement).is_err());
5164         }
5165 }