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

   1 use bitcoin::blockdata::block::BlockHeader;
   2 use bitcoin::blockdata::transaction::Transaction;
   3 use bitcoin::blockdata::constants::genesis_block;
   4 use bitcoin::network::constants::Network;
   5 use bitcoin::network::serialize::BitcoinHash;
   6 use bitcoin::util::hash::Sha256dHash;
   7
   8 use secp256k1::key::{SecretKey,PublicKey};
   9 use secp256k1::{Secp256k1,Message};
  10 use secp256k1::ecdh::SharedSecret;
  11 use secp256k1;
  12
  13 use chain::chaininterface::{BroadcasterInterface,ChainListener,ChainWatchInterface,FeeEstimator};
  14 use chain::transaction::OutPoint;
  15 use ln::channel::{Channel, ChannelKeys};
  16 use ln::channelmonitor::ManyChannelMonitor;
  17 use ln::router::{Route,RouteHop};
  18 use ln::msgs;
  19 use ln::msgs::{HandleError,ChannelMessageHandler,MsgEncodable,MsgDecodable};
  20 use util::{byte_utils, events, internal_traits, rng};
  21 use util::sha2::Sha256;
  22 use util::chacha20poly1305rfc::ChaCha20;
  23 use util::logger::{Logger, Record};
  24
  25 use crypto;
  26 use crypto::mac::{Mac,MacResult};
  27 use crypto::hmac::Hmac;
  28 use crypto::digest::Digest;
  29 use crypto::symmetriccipher::SynchronousStreamCipher;
  30
  31 use std::{ptr, mem};
  32 use std::collections::HashMap;
  33 use std::collections::hash_map;
  34 use std::sync::{Mutex,MutexGuard,Arc};
  35 use std::sync::atomic::{AtomicUsize, Ordering};
  36 use std::time::{Instant,Duration};
  37
  38 mod channel_held_info {
  39         use ln::msgs;
  40
  41         /// Stores the info we will need to send when we want to forward an HTLC onwards
  42         pub struct PendingForwardHTLCInfo {
  43                 pub(super) onion_packet: Option<msgs::OnionPacket>,
  44                 pub(super) payment_hash: [u8; 32],
  45                 pub(super) short_channel_id: u64,
  46                 pub(super) prev_short_channel_id: u64,
  47                 pub(super) amt_to_forward: u64,
  48                 pub(super) outgoing_cltv_value: u32,
  49         }
  50
  51         #[cfg(feature = "fuzztarget")]
  52         impl PendingForwardHTLCInfo {
  53                 pub fn dummy() -> Self {
  54                         Self {
  55                                 onion_packet: None,
  56                                 payment_hash: [0; 32],
  57                                 short_channel_id: 0,
  58                                 prev_short_channel_id: 0,
  59                                 amt_to_forward: 0,
  60                                 outgoing_cltv_value: 0,
  61                         }
  62                 }
  63         }
  64
  65         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  66         pub enum HTLCFailReason {
  67                 ErrorPacket {
  68                         err: msgs::OnionErrorPacket,
  69                 },
  70                 Reason {
  71                         failure_code: u16,
  72                         data: Vec<u8>,
  73                 }
  74         }
  75
  76         #[cfg(feature = "fuzztarget")]
  77         impl HTLCFailReason {
  78                 pub fn dummy() -> Self {
  79                         HTLCFailReason::Reason {
  80                                 failure_code: 0, data: Vec::new(),
  81                         }
  82                 }
  83         }
  84 }
  85 #[cfg(feature = "fuzztarget")]
  86 pub use self::channel_held_info::*;
  87 #[cfg(not(feature = "fuzztarget"))]
  88 pub(crate) use self::channel_held_info::*;
  89
  90 enum PendingOutboundHTLC {
  91         IntermediaryHopData {
  92                 source_short_channel_id: u64,
  93                 incoming_packet_shared_secret: SharedSecret,
  94         },
  95         OutboundRoute {
  96                 route: Route,
  97                 session_priv: SecretKey,
  98         },
  99         /// Used for channel rebalancing
 100         CycledRoute {
 101                 source_short_channel_id: u64,
 102                 incoming_packet_shared_secret: SharedSecret,
 103                 route: Route,
 104                 session_priv: SecretKey,
 105         }
 106 }
 107
 108 /// We hold back HTLCs we intend to relay for a random interval in the range (this, 5*this). This
 109 /// provides some limited amount of privacy. Ideally this would range from somewhere like 1 second
 110 /// to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly. We could
 111 /// probably increase this significantly.
 112 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u32 = 50;
 113
 114 struct ChannelHolder {
 115         by_id: HashMap<[u8; 32], Channel>,
 116         short_to_id: HashMap<u64, [u8; 32]>,
 117         next_forward: Instant,
 118         /// short channel id -> forward infos. Key of 0 means payments received
 119         /// Note that while this is held in the same mutex as the channels themselves, no consistency
 120         /// guarantees are made about there existing a channel with the short id here, nor the short
 121         /// ids in the PendingForwardHTLCInfo!
 122         forward_htlcs: HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 123         /// Note that while this is held in the same mutex as the channels themselves, no consistency
 124         /// guarantees are made about the channels given here actually existing anymore by the time you
 125         /// go to read them!
 126         claimable_htlcs: HashMap<[u8; 32], PendingOutboundHTLC>,
 127 }
 128 struct MutChannelHolder<'a> {
 129         by_id: &'a mut HashMap<[u8; 32], Channel>,
 130         short_to_id: &'a mut HashMap<u64, [u8; 32]>,
 131         next_forward: &'a mut Instant,
 132         forward_htlcs: &'a mut HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 133         claimable_htlcs: &'a mut HashMap<[u8; 32], PendingOutboundHTLC>,
 134 }
 135 impl ChannelHolder {
 136         fn borrow_parts(&mut self) -> MutChannelHolder {
 137                 MutChannelHolder {
 138                         by_id: &mut self.by_id,
 139                         short_to_id: &mut self.short_to_id,
 140                         next_forward: &mut self.next_forward,
 141                         forward_htlcs: &mut self.forward_htlcs,
 142                         claimable_htlcs: &mut self.claimable_htlcs,
 143                 }
 144         }
 145 }
 146
 147 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
 148 const ERR: () = "You need at least 32 bit pointers (well, usize, but we'll assume they're the same) for ChannelManager::latest_block_height";
 149
 150 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 151 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
 152 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
 153 /// to individual Channels.
 154 pub struct ChannelManager {
 155         genesis_hash: Sha256dHash,
 156         fee_estimator: Arc<FeeEstimator>,
 157         monitor: Arc<ManyChannelMonitor>,
 158         chain_monitor: Arc<ChainWatchInterface>,
 159         tx_broadcaster: Arc<BroadcasterInterface>,
 160
 161         announce_channels_publicly: bool,
 162         fee_proportional_millionths: u32,
 163         latest_block_height: AtomicUsize,
 164         secp_ctx: Secp256k1,
 165
 166         channel_state: Mutex<ChannelHolder>,
 167         our_network_key: SecretKey,
 168
 169         pending_events: Mutex<Vec<events::Event>>,
 170
 171         logger: Arc<Logger>,
 172 }
 173
 174 const CLTV_EXPIRY_DELTA: u16 = 6 * 24 * 2; //TODO?
 175
 176 macro_rules! secp_call {
 177         ( $res : expr ) => {
 178                 match $res {
 179                         Ok(key) => key,
 180                         //TODO: Make the err a parameter!
 181                         Err(_) => return Err(HandleError{err: "Key error", action: None})
 182                 }
 183         };
 184 }
 185
 186 struct OnionKeys {
 187         #[cfg(test)]
 188         shared_secret: SharedSecret,
 189         #[cfg(test)]
 190         blinding_factor: [u8; 32],
 191         ephemeral_pubkey: PublicKey,
 192         rho: [u8; 32],
 193         mu: [u8; 32],
 194 }
 195
 196 pub struct ChannelDetails {
 197         /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
 198         /// thereafter this is the txid of the funding transaction xor the funding transaction output).
 199         /// Note that this means this value is *not* persistent - it can change once during the
 200         /// lifetime of the channel.
 201         pub channel_id: [u8; 32],
 202         /// The position of the funding transaction in the chain. None if the funding transaction has
 203         /// not yet been confirmed and the channel fully opened.
 204         pub short_channel_id: Option<u64>,
 205         pub remote_network_id: PublicKey,
 206         pub channel_value_satoshis: u64,
 207         /// The user_id passed in to create_channel, or 0 if the channel was inbound.
 208         pub user_id: u64,
 209 }
 210
 211 impl ChannelManager {
 212         /// Constructs a new ChannelManager to hold several channels and route between them. This is
 213         /// the main "logic hub" for all channel-related actions, and implements ChannelMessageHandler.
 214         /// fee_proportional_millionths is an optional fee to charge any payments routed through us.
 215         /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
 216         /// panics if channel_value_satoshis is >= `MAX_FUNDING_SATOSHIS`!
 217         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> {
 218                 let secp_ctx = Secp256k1::new();
 219
 220                 let res = Arc::new(ChannelManager {
 221                         genesis_hash: genesis_block(network).header.bitcoin_hash(),
 222                         fee_estimator: feeest.clone(),
 223                         monitor: monitor.clone(),
 224                         chain_monitor,
 225                         tx_broadcaster,
 226
 227                         announce_channels_publicly,
 228                         fee_proportional_millionths,
 229                         latest_block_height: AtomicUsize::new(0), //TODO: Get an init value (generally need to replay recent chain on chain_monitor registration)
 230                         secp_ctx,
 231
 232                         channel_state: Mutex::new(ChannelHolder{
 233                                 by_id: HashMap::new(),
 234                                 short_to_id: HashMap::new(),
 235                                 next_forward: Instant::now(),
 236                                 forward_htlcs: HashMap::new(),
 237                                 claimable_htlcs: HashMap::new(),
 238                         }),
 239                         our_network_key,
 240
 241                         pending_events: Mutex::new(Vec::new()),
 242
 243                         logger,
 244                 });
 245                 let weak_res = Arc::downgrade(&res);
 246                 res.chain_monitor.register_listener(weak_res);
 247                 Ok(res)
 248         }
 249
 250         /// Creates a new outbound channel to the given remote node and with the given value.
 251         /// user_id will be provided back as user_channel_id in FundingGenerationReady and
 252         /// FundingBroadcastSafe events to allow tracking of which events correspond with which
 253         /// create_channel call. Note that user_channel_id defaults to 0 for inbound channels, so you
 254         /// may wish to avoid using 0 for user_id here.
 255         /// If successful, will generate a SendOpenChannel event, so you should probably poll
 256         /// PeerManager::process_events afterwards.
 257         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, user_id: u64) -> Result<(), HandleError> {
 258                 let chan_keys = if cfg!(feature = "fuzztarget") {
 259                         ChannelKeys {
 260                                 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(),
 261                                 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(),
 262                                 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(),
 263                                 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(),
 264                                 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(),
 265                                 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(),
 266                                 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(),
 267                                 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],
 268                         }
 269                 } else {
 270                         let mut key_seed = [0u8; 32];
 271                         rng::fill_bytes(&mut key_seed);
 272                         match ChannelKeys::new_from_seed(&key_seed) {
 273                                 Ok(key) => key,
 274                                 Err(_) => panic!("RNG is busted!")
 275                         }
 276                 };
 277
 278                 let channel = Channel::new_outbound(&*self.fee_estimator, chan_keys, their_network_key, channel_value_satoshis, self.announce_channels_publicly, user_id, Arc::clone(&self.logger));
 279                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator)?;
 280                 let mut channel_state = self.channel_state.lock().unwrap();
 281                 match channel_state.by_id.insert(channel.channel_id(), channel) {
 282                         Some(_) => panic!("RNG is bad???"),
 283                         None => {}
 284                 }
 285
 286                 let mut events = self.pending_events.lock().unwrap();
 287                 events.push(events::Event::SendOpenChannel {
 288                         node_id: their_network_key,
 289                         msg: res,
 290                 });
 291                 Ok(())
 292         }
 293
 294         /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
 295         /// more information.
 296         pub fn list_channels(&self) -> Vec<ChannelDetails> {
 297                 let channel_state = self.channel_state.lock().unwrap();
 298                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 299                 for (channel_id, channel) in channel_state.by_id.iter() {
 300                         res.push(ChannelDetails {
 301                                 channel_id: (*channel_id).clone(),
 302                                 short_channel_id: channel.get_short_channel_id(),
 303                                 remote_network_id: channel.get_their_node_id(),
 304                                 channel_value_satoshis: channel.get_value_satoshis(),
 305                                 user_id: channel.get_user_id(),
 306                         });
 307                 }
 308                 res
 309         }
 310
 311         /// Gets the list of usable channels, in random order. Useful as an argument to
 312         /// Router::get_route to ensure non-announced channels are used.
 313         pub fn list_usable_channels(&self) -> Vec<ChannelDetails> {
 314                 let channel_state = self.channel_state.lock().unwrap();
 315                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 316                 for (channel_id, channel) in channel_state.by_id.iter() {
 317                         if channel.is_usable() {
 318                                 res.push(ChannelDetails {
 319                                         channel_id: (*channel_id).clone(),
 320                                         short_channel_id: channel.get_short_channel_id(),
 321                                         remote_network_id: channel.get_their_node_id(),
 322                                         channel_value_satoshis: channel.get_value_satoshis(),
 323                                         user_id: channel.get_user_id(),
 324                                 });
 325                         }
 326                 }
 327                 res
 328         }
 329
 330         /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
 331         /// will be accepted on the given channel, and after additional timeout/the closing of all
 332         /// pending HTLCs, the channel will be closed on chain.
 333         /// May generate a SendShutdown event on success, which should be relayed.
 334         pub fn close_channel(&self, channel_id: &[u8; 32]) -> Result<(), HandleError> {
 335                 let (res, node_id, chan_option) = {
 336                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 337                         let channel_state = channel_state_lock.borrow_parts();
 338                         match channel_state.by_id.entry(channel_id.clone()) {
 339                                 hash_map::Entry::Occupied(mut chan_entry) => {
 340                                         let res = chan_entry.get_mut().get_shutdown()?;
 341                                         if chan_entry.get().is_shutdown() {
 342                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
 343                                                         channel_state.short_to_id.remove(&short_id);
 344                                                 }
 345                                                 (res, chan_entry.get().get_their_node_id(), Some(chan_entry.remove_entry().1))
 346                                         } else { (res, chan_entry.get().get_their_node_id(), None) }
 347                                 },
 348                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "No such channel", action: None})
 349                         }
 350                 };
 351                 for payment_hash in res.1 {
 352                         // unknown_next_peer...I dunno who that is anymore....
 353                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 354                 }
 355                 let chan_update = if let Some(chan) = chan_option {
 356                         if let Ok(update) = self.get_channel_update(&chan) {
 357                                 Some(update)
 358                         } else { None }
 359                 } else { None };
 360
 361                 let mut events = self.pending_events.lock().unwrap();
 362                 if let Some(update) = chan_update {
 363                         events.push(events::Event::BroadcastChannelUpdate {
 364                                 msg: update
 365                         });
 366                 }
 367                 events.push(events::Event::SendShutdown {
 368                         node_id,
 369                         msg: res.0
 370                 });
 371
 372                 Ok(())
 373         }
 374
 375         #[inline]
 376         fn finish_force_close_channel(&self, shutdown_res: (Vec<Transaction>, Vec<[u8; 32]>)) {
 377                 let (local_txn, failed_htlcs) = shutdown_res;
 378                 for payment_hash in failed_htlcs {
 379                         // unknown_next_peer...I dunno who that is anymore....
 380                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 381                 }
 382                 for tx in local_txn {
 383                         self.tx_broadcaster.broadcast_transaction(&tx);
 384                 }
 385                 //TODO: We need to have a way where outbound HTLC claims can result in us claiming the
 386                 //now-on-chain HTLC output for ourselves (and, thereafter, passing the HTLC backwards).
 387                 //TODO: We need to handle monitoring of pending offered HTLCs which just hit the chain and
 388                 //may be claimed, resulting in us claiming the inbound HTLCs (and back-failing after
 389                 //timeouts are hit and our claims confirm).
 390         }
 391
 392         /// Force closes a channel, immediately broadcasting the latest local commitment transaction to
 393         /// the chain and rejecting new HTLCs on the given channel.
 394         pub fn force_close_channel(&self, channel_id: &[u8; 32]) {
 395                 let mut chan = {
 396                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 397                         let channel_state = channel_state_lock.borrow_parts();
 398                         if let Some(chan) = channel_state.by_id.remove(channel_id) {
 399                                 if let Some(short_id) = chan.get_short_channel_id() {
 400                                         channel_state.short_to_id.remove(&short_id);
 401                                 }
 402                                 chan
 403                         } else {
 404                                 return;
 405                         }
 406                 };
 407                 self.finish_force_close_channel(chan.force_shutdown());
 408                 let mut events = self.pending_events.lock().unwrap();
 409                 if let Ok(update) = self.get_channel_update(&chan) {
 410                         events.push(events::Event::BroadcastChannelUpdate {
 411                                 msg: update
 412                         });
 413                 }
 414         }
 415
 416         #[inline]
 417         fn gen_rho_mu_from_shared_secret(shared_secret: &SharedSecret) -> ([u8; 32], [u8; 32]) {
 418                 ({
 419                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 420                         hmac.input(&shared_secret[..]);
 421                         let mut res = [0; 32];
 422                         hmac.raw_result(&mut res);
 423                         res
 424                 },
 425                 {
 426                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 427                         hmac.input(&shared_secret[..]);
 428                         let mut res = [0; 32];
 429                         hmac.raw_result(&mut res);
 430                         res
 431                 })
 432         }
 433
 434         #[inline]
 435         fn gen_um_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 436                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 437                 hmac.input(&shared_secret[..]);
 438                 let mut res = [0; 32];
 439                 hmac.raw_result(&mut res);
 440                 res
 441         }
 442
 443         #[inline]
 444         fn gen_ammag_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 445                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 446                 hmac.input(&shared_secret[..]);
 447                 let mut res = [0; 32];
 448                 hmac.raw_result(&mut res);
 449                 res
 450         }
 451
 452         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 453         #[inline]
 454         fn construct_onion_keys_callback<FType: FnMut(SharedSecret, [u8; 32], PublicKey, &RouteHop)> (secp_ctx: &Secp256k1, route: &Route, session_priv: &SecretKey, mut callback: FType) -> Result<(), HandleError> {
 455                 let mut blinded_priv = session_priv.clone();
 456                 let mut blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 457                 let mut first_iteration = true;
 458
 459                 for hop in route.hops.iter() {
 460                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 461
 462                         let mut sha = Sha256::new();
 463                         sha.input(&blinded_pub.serialize()[..]);
 464                         sha.input(&shared_secret[..]);
 465                         let mut blinding_factor = [0u8; 32];
 466                         sha.result(&mut blinding_factor);
 467
 468                         if first_iteration {
 469                                 blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 470                                 first_iteration = false;
 471                         }
 472                         let ephemeral_pubkey = blinded_pub;
 473
 474                         secp_call!(blinded_priv.mul_assign(secp_ctx, &secp_call!(SecretKey::from_slice(secp_ctx, &blinding_factor))));
 475                         blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 476
 477                         callback(shared_secret, blinding_factor, ephemeral_pubkey, hop);
 478                 }
 479
 480                 Ok(())
 481         }
 482
 483         // can only fail if an intermediary hop has an invalid public key or session_priv is invalid
 484         fn construct_onion_keys(secp_ctx: &Secp256k1, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, HandleError> {
 485                 let mut res = Vec::with_capacity(route.hops.len());
 486
 487                 Self::construct_onion_keys_callback(secp_ctx, route, session_priv, |shared_secret, _blinding_factor, ephemeral_pubkey, _| {
 488                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 489
 490                         res.push(OnionKeys {
 491                                 #[cfg(test)]
 492                                 shared_secret,
 493                                 #[cfg(test)]
 494                                 blinding_factor: _blinding_factor,
 495                                 ephemeral_pubkey,
 496                                 rho,
 497                                 mu,
 498                         });
 499                 })?;
 500
 501                 Ok(res)
 502         }
 503
 504         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 505         fn build_onion_payloads(route: &Route, starting_htlc_offset: u32) -> Result<(Vec<msgs::OnionHopData>, u64, u32), HandleError> {
 506                 let mut cur_value_msat = 0u64;
 507                 let mut cur_cltv = starting_htlc_offset;
 508                 let mut last_short_channel_id = 0;
 509                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 510                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 511                 unsafe { res.set_len(route.hops.len()); }
 512
 513                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 514                         // First hop gets special values so that it can check, on receipt, that everything is
 515                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 516                         // the intended recipient).
 517                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 518                         let cltv = if cur_cltv == starting_htlc_offset { hop.cltv_expiry_delta + starting_htlc_offset } else { cur_cltv };
 519                         res[idx] = msgs::OnionHopData {
 520                                 realm: 0,
 521                                 data: msgs::OnionRealm0HopData {
 522                                         short_channel_id: last_short_channel_id,
 523                                         amt_to_forward: value_msat,
 524                                         outgoing_cltv_value: cltv,
 525                                 },
 526                                 hmac: [0; 32],
 527                         };
 528                         cur_value_msat += hop.fee_msat;
 529                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 530                                 return Err(HandleError{err: "Channel fees overflowed?!", action: None});
 531                         }
 532                         cur_cltv += hop.cltv_expiry_delta as u32;
 533                         if cur_cltv >= 500000000 {
 534                                 return Err(HandleError{err: "Channel CLTV overflowed?!", action: None});
 535                         }
 536                         last_short_channel_id = hop.short_channel_id;
 537                 }
 538                 Ok((res, cur_value_msat, cur_cltv))
 539         }
 540
 541         #[inline]
 542         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 543                 unsafe {
 544                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 545                 }
 546                 for i in 0..65 {
 547                         arr[i] = 0;
 548                 }
 549         }
 550
 551         #[inline]
 552         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 553                 assert_eq!(dst.len(), src.len());
 554
 555                 for i in 0..dst.len() {
 556                         dst[i] ^= src[i];
 557                 }
 558         }
 559
 560         const ZERO:[u8; 21*65] = [0; 21*65];
 561         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: &[u8; 32]) -> Result<msgs::OnionPacket, HandleError> {
 562                 let mut buf = Vec::with_capacity(21*65);
 563                 buf.resize(21*65, 0);
 564
 565                 let filler = {
 566                         let iters = payloads.len() - 1;
 567                         let end_len = iters * 65;
 568                         let mut res = Vec::with_capacity(end_len);
 569                         res.resize(end_len, 0);
 570
 571                         for (i, keys) in onion_keys.iter().enumerate() {
 572                                 if i == payloads.len() - 1 { continue; }
 573                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 574                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 575                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 576                         }
 577                         res
 578                 };
 579
 580                 let mut packet_data = [0; 20*65];
 581                 let mut hmac_res = [0; 32];
 582
 583                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 584                         ChannelManager::shift_arr_right(&mut packet_data);
 585                         payload.hmac = hmac_res;
 586                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 587
 588                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 589                         chacha.process(&packet_data, &mut buf[0..20*65]);
 590                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 591
 592                         if i == 0 {
 593                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 594                         }
 595
 596                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 597                         hmac.input(&packet_data);
 598                         hmac.input(&associated_data[..]);
 599                         hmac.raw_result(&mut hmac_res);
 600                 }
 601
 602                 Ok(msgs::OnionPacket{
 603                         version: 0,
 604                         public_key: onion_keys.first().unwrap().ephemeral_pubkey,
 605                         hop_data: packet_data,
 606                         hmac: hmac_res,
 607                 })
 608         }
 609
 610         /// Encrypts a failure packet. raw_packet can either be a
 611         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 612         fn encrypt_failure_packet(shared_secret: &SharedSecret, raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 613                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 614
 615                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 616                 packet_crypted.resize(raw_packet.len(), 0);
 617                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 618                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 619                 msgs::OnionErrorPacket {
 620                         data: packet_crypted,
 621                 }
 622         }
 623
 624         fn build_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 625                 assert!(failure_data.len() <= 256 - 2);
 626
 627                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 628
 629                 let failuremsg = {
 630                         let mut res = Vec::with_capacity(2 + failure_data.len());
 631                         res.push(((failure_type >> 8) & 0xff) as u8);
 632                         res.push(((failure_type >> 0) & 0xff) as u8);
 633                         res.extend_from_slice(&failure_data[..]);
 634                         res
 635                 };
 636                 let pad = {
 637                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 638                         res.resize(256 - 2 - failure_data.len(), 0);
 639                         res
 640                 };
 641                 let mut packet = msgs::DecodedOnionErrorPacket {
 642                         hmac: [0; 32],
 643                         failuremsg: failuremsg,
 644                         pad: pad,
 645                 };
 646
 647                 let mut hmac = Hmac::new(Sha256::new(), &um);
 648                 hmac.input(&packet.encode()[32..]);
 649                 hmac.raw_result(&mut packet.hmac);
 650
 651                 packet
 652         }
 653
 654         #[inline]
 655         fn build_first_hop_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 656                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 657                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 658         }
 659
 660         /// only fails if the channel does not yet have an assigned short_id
 661         fn get_channel_update(&self, chan: &Channel) -> Result<msgs::ChannelUpdate, HandleError> {
 662                 let short_channel_id = match chan.get_short_channel_id() {
 663                         None => return Err(HandleError{err: "Channel not yet established", action: None}),
 664                         Some(id) => id,
 665                 };
 666
 667                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap().serialize()[..] < chan.get_their_node_id().serialize()[..];
 668
 669                 let unsigned = msgs::UnsignedChannelUpdate {
 670                         chain_hash: self.genesis_hash,
 671                         short_channel_id: short_channel_id,
 672                         timestamp: chan.get_channel_update_count(),
 673                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
 674                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
 675                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
 676                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
 677                         fee_proportional_millionths: self.fee_proportional_millionths,
 678                 };
 679
 680                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
 681                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key).unwrap(); //TODO Can we unwrap here?
 682
 683                 Ok(msgs::ChannelUpdate {
 684                         signature: sig,
 685                         contents: unsigned
 686                 })
 687         }
 688
 689         /// Sends a payment along a given route.
 690         /// Value parameters are provided via the last hop in route, see documentation for RouteHop
 691         /// fields for more info.
 692         /// Note that if the payment_hash already exists elsewhere (eg you're sending a duplicative
 693         /// payment), we don't do anything to stop you! We always try to ensure that if the provided
 694         /// next hop knows the preimage to payment_hash they can claim an additional amount as
 695         /// specified in the last hop in the route! Thus, you should probably do your own
 696         /// payment_preimage tracking (which you should already be doing as they represent "proof of
 697         /// payment") and prevent double-sends yourself.
 698         /// See-also docs on Channel::send_htlc_and_commit.
 699         /// May generate a SendHTLCs event on success, which should be relayed.
 700         pub fn send_payment(&self, route: Route, payment_hash: [u8; 32]) -> Result<(), HandleError> {
 701                 if route.hops.len() < 1 || route.hops.len() > 20 {
 702                         return Err(HandleError{err: "Route didn't go anywhere/had bogus size", action: None});
 703                 }
 704                 let our_node_id = self.get_our_node_id();
 705                 for (idx, hop) in route.hops.iter().enumerate() {
 706                         if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
 707                                 return Err(HandleError{err: "Route went through us but wasn't a simple rebalance loop to us", action: None});
 708                         }
 709                 }
 710
 711                 let session_priv = secp_call!(SecretKey::from_slice(&self.secp_ctx, &{
 712                         let mut session_key = [0; 32];
 713                         rng::fill_bytes(&mut session_key);
 714                         session_key
 715                 }));
 716
 717                 let cur_height = self.latest_block_height.load(Ordering::Acquire) as u32 + 1;
 718
 719                 let onion_keys = ChannelManager::construct_onion_keys(&self.secp_ctx, &route, &session_priv)?;
 720                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route, cur_height)?;
 721                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, &payment_hash)?;
 722
 723                 let (first_hop_node_id, (update_add, commitment_signed, chan_monitor)) = {
 724                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 725                         let channel_state = channel_state_lock.borrow_parts();
 726
 727                         let id = match channel_state.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
 728                                 None => return Err(HandleError{err: "No channel available with first hop!", action: None}),
 729                                 Some(id) => id.clone()
 730                         };
 731
 732                         let claimable_htlc_entry = channel_state.claimable_htlcs.entry(payment_hash.clone());
 733                         if let hash_map::Entry::Occupied(_) = claimable_htlc_entry {
 734                                 return Err(HandleError{err: "Already had pending HTLC with the same payment_hash", action: None});
 735                         }
 736
 737                         let res = {
 738                                 let chan = channel_state.by_id.get_mut(&id).unwrap();
 739                                 if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
 740                                         return Err(HandleError{err: "Node ID mismatch on first hop!", action: None});
 741                                 }
 742                                 chan.send_htlc_and_commit(htlc_msat, payment_hash, htlc_cltv, onion_packet)?
 743                         };
 744
 745                         let first_hop_node_id = route.hops.first().unwrap().pubkey;
 746
 747                         claimable_htlc_entry.or_insert(PendingOutboundHTLC::OutboundRoute {
 748                                 route,
 749                                 session_priv,
 750                         });
 751
 752                         match res {
 753                                 Some(msgs) => (first_hop_node_id, msgs),
 754                                 None => return Ok(()),
 755                         }
 756                 };
 757
 758                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 759                         unimplemented!(); // maybe remove from claimable_htlcs?
 760                 }
 761
 762                 let mut events = self.pending_events.lock().unwrap();
 763                 events.push(events::Event::SendHTLCs {
 764                         node_id: first_hop_node_id,
 765                         msgs: vec![update_add],
 766                         commitment_msg: commitment_signed,
 767                 });
 768                 Ok(())
 769         }
 770
 771         /// Call this upon creation of a funding transaction for the given channel.
 772         /// Panics if a funding transaction has already been provided for this channel.
 773         /// May panic if the funding_txo is duplicative with some other channel (note that this should
 774         /// be trivially prevented by using unique funding transaction keys per-channel).
 775         pub fn funding_transaction_generated(&self, temporary_channel_id: &[u8; 32], funding_txo: OutPoint) {
 776
 777                 macro_rules! add_pending_event {
 778                         ($event: expr) => {
 779                                 {
 780                                         let mut pending_events = self.pending_events.lock().unwrap();
 781                                         pending_events.push($event);
 782                                 }
 783                         }
 784                 }
 785
 786                 let (chan, msg, chan_monitor) = {
 787                         let mut channel_state = self.channel_state.lock().unwrap();
 788                         match channel_state.by_id.remove(temporary_channel_id) {
 789                                 Some(mut chan) => {
 790                                         match chan.get_outbound_funding_created(funding_txo) {
 791                                                 Ok(funding_msg) => {
 792                                                         (chan, funding_msg.0, funding_msg.1)
 793                                                 },
 794                                                 Err(e) => {
 795                                                         log_error!(self, "Got bad signatures: {}!", e.err);
 796                                                         mem::drop(channel_state);
 797                                                         add_pending_event!(events::Event::HandleError {
 798                                                                 node_id: chan.get_their_node_id(),
 799                                                                 action: e.action,
 800                                                         });
 801                                                         return;
 802                                                 },
 803                                         }
 804                                 },
 805                                 None => return
 806                         }
 807                 }; // Release channel lock for install_watch_outpoint call,
 808                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 809                         unimplemented!(); // maybe remove from claimable_htlcs?
 810                 }
 811                 add_pending_event!(events::Event::SendFundingCreated {
 812                         node_id: chan.get_their_node_id(),
 813                         msg: msg,
 814                 });
 815
 816                 let mut channel_state = self.channel_state.lock().unwrap();
 817                 match channel_state.by_id.entry(chan.channel_id()) {
 818                         hash_map::Entry::Occupied(_) => {
 819                                 panic!("Generated duplicate funding txid?");
 820                         },
 821                         hash_map::Entry::Vacant(e) => {
 822                                 e.insert(chan);
 823                         }
 824                 }
 825         }
 826
 827         fn get_announcement_sigs(&self, chan: &Channel) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
 828                 if !chan.is_usable() || !chan.should_announce() { return Ok(None) }
 829
 830                 let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone())?;
 831                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
 832                 let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
 833
 834                 Ok(Some(msgs::AnnouncementSignatures {
 835                         channel_id: chan.channel_id(),
 836                         short_channel_id: chan.get_short_channel_id().unwrap(),
 837                         node_signature: our_node_sig,
 838                         bitcoin_signature: our_bitcoin_sig,
 839                 }))
 840         }
 841
 842         /// Processes HTLCs which are pending waiting on random forward delay.
 843         /// Should only really ever be called in response to an PendingHTLCsForwardable event.
 844         /// Will likely generate further events.
 845         pub fn process_pending_htlc_forwards(&self) {
 846                 let mut new_events = Vec::new();
 847                 let mut failed_forwards = Vec::new();
 848                 {
 849                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 850                         let channel_state = channel_state_lock.borrow_parts();
 851
 852                         if cfg!(not(feature = "fuzztarget")) && Instant::now() < *channel_state.next_forward {
 853                                 return;
 854                         }
 855
 856                         for (short_chan_id, pending_forwards) in channel_state.forward_htlcs.drain() {
 857                                 if short_chan_id != 0 {
 858                                         let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
 859                                                 Some(chan_id) => chan_id.clone(),
 860                                                 None => {
 861                                                         failed_forwards.reserve(pending_forwards.len());
 862                                                         for forward_info in pending_forwards {
 863                                                                 failed_forwards.push((forward_info.payment_hash, 0x4000 | 10, None));
 864                                                         }
 865                                                         continue;
 866                                                 }
 867                                         };
 868                                         let forward_chan = &mut channel_state.by_id.get_mut(&forward_chan_id).unwrap();
 869
 870                                         let mut add_htlc_msgs = Vec::new();
 871                                         for forward_info in pending_forwards {
 872                                                 match forward_chan.send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, forward_info.onion_packet.unwrap()) {
 873                                                         Err(_e) => {
 874                                                                 let chan_update = self.get_channel_update(forward_chan).unwrap();
 875                                                                 failed_forwards.push((forward_info.payment_hash, 0x1000 | 7, Some(chan_update)));
 876                                                                 continue;
 877                                                         },
 878                                                         Ok(update_add) => {
 879                                                                 match update_add {
 880                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
 881                                                                         None => {
 882                                                                                 // Nothing to do here...we're waiting on a remote
 883                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
 884                                                                                 // will automatically handle building the update_add_htlc and
 885                                                                                 // commitment_signed messages when we can.
 886                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
 887                                                                                 // as we don't really want others relying on us relaying through
 888                                                                                 // this channel currently :/.
 889                                                                         }
 890                                                                 }
 891                                                         }
 892                                                 }
 893                                         }
 894
 895                                         if !add_htlc_msgs.is_empty() {
 896                                                 let (commitment_msg, monitor) = match forward_chan.send_commitment() {
 897                                                         Ok(res) => res,
 898                                                         Err(_e) => {
 899                                                                 //TODO: Handle...this is bad!
 900                                                                 continue;
 901                                                         },
 902                                                 };
 903                                                 new_events.push((Some(monitor), events::Event::SendHTLCs {
 904                                                         node_id: forward_chan.get_their_node_id(),
 905                                                         msgs: add_htlc_msgs,
 906                                                         commitment_msg: commitment_msg,
 907                                                 }));
 908                                         }
 909                                 } else {
 910                                         for forward_info in pending_forwards {
 911                                                 new_events.push((None, events::Event::PaymentReceived {
 912                                                         payment_hash: forward_info.payment_hash,
 913                                                         amt: forward_info.amt_to_forward,
 914                                                 }));
 915                                         }
 916                                 }
 917                         }
 918                 }
 919
 920                 for failed_forward in failed_forwards.drain(..) {
 921                         match failed_forward.2 {
 922                                 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failed_forward.0, HTLCFailReason::Reason { failure_code: failed_forward.1, data: Vec::new() }),
 923                                 Some(chan_update) => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failed_forward.0, HTLCFailReason::Reason { failure_code: failed_forward.1, data: chan_update.encode_with_len() }),
 924                         };
 925                 }
 926
 927                 if new_events.is_empty() { return }
 928
 929                 new_events.retain(|event| {
 930                         if let &Some(ref monitor) = &event.0 {
 931                                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor.clone()) {
 932                                         unimplemented!();// but def dont push the event...
 933                                 }
 934                         }
 935                         true
 936                 });
 937
 938                 let mut events = self.pending_events.lock().unwrap();
 939                 events.reserve(new_events.len());
 940                 for event in new_events.drain(..) {
 941                         events.push(event.1);
 942                 }
 943         }
 944
 945         /// Indicates that the preimage for payment_hash is unknown after a PaymentReceived event.
 946         pub fn fail_htlc_backwards(&self, payment_hash: &[u8; 32]) -> bool {
 947                 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: Vec::new() })
 948         }
 949
 950         /// Fails an HTLC backwards to the sender of it to us.
 951         /// Note that while we take a channel_state lock as input, we do *not* assume consistency here.
 952         /// There are several callsites that do stupid things like loop over a list of payment_hashes
 953         /// to fail and take the channel_state lock for each iteration (as we take ownership and may
 954         /// drop it). In other words, no assumptions are made that entries in claimable_htlcs point to
 955         /// still-available channels.
 956         fn fail_htlc_backwards_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, payment_hash: &[u8; 32], onion_error: HTLCFailReason) -> bool {
 957                 let mut pending_htlc = {
 958                         match channel_state.claimable_htlcs.remove(payment_hash) {
 959                                 Some(pending_htlc) => pending_htlc,
 960                                 None => return false,
 961                         }
 962                 };
 963
 964                 match pending_htlc {
 965                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
 966                                 channel_state.claimable_htlcs.insert(payment_hash.clone(), PendingOutboundHTLC::OutboundRoute {
 967                                         route,
 968                                         session_priv,
 969                                 });
 970                                 pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 971                         },
 972                         _ => {}
 973                 }
 974
 975                 match pending_htlc {
 976                         PendingOutboundHTLC::CycledRoute { .. } => unreachable!(),
 977                         PendingOutboundHTLC::OutboundRoute { .. } => {
 978                                 mem::drop(channel_state);
 979
 980                                 let mut pending_events = self.pending_events.lock().unwrap();
 981                                 pending_events.push(events::Event::PaymentFailed {
 982                                         payment_hash: payment_hash.clone()
 983                                 });
 984                                 false
 985                         },
 986                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret } => {
 987                                 let err_packet = match onion_error {
 988                                         HTLCFailReason::Reason { failure_code, data } => {
 989                                                 let packet = ChannelManager::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
 990                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
 991                                         },
 992                                         HTLCFailReason::ErrorPacket { err } => {
 993                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
 994                                         }
 995                                 };
 996
 997                                 let (node_id, fail_msgs) = {
 998                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 999                                                 Some(chan_id) => chan_id.clone(),
1000                                                 None => return false
1001                                         };
1002
1003                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
1004                                         match chan.get_update_fail_htlc_and_commit(payment_hash, err_packet) {
1005                                                 Ok(msg) => (chan.get_their_node_id(), msg),
1006                                                 Err(_e) => {
1007                                                         //TODO: Do something with e?
1008                                                         return false;
1009                                                 },
1010                                         }
1011                                 };
1012
1013                                 match fail_msgs {
1014                                         Some((msg, commitment_msg, chan_monitor)) => {
1015                                                 mem::drop(channel_state);
1016
1017                                                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1018                                                         unimplemented!();// but def dont push the event...
1019                                                 }
1020
1021                                                 let mut pending_events = self.pending_events.lock().unwrap();
1022                                                 //TODO: replace by HandleError ? UpdateFailHTLC in handle_update_add_htlc need also to build a CommitmentSigned
1023                                                 pending_events.push(events::Event::SendFailHTLC {
1024                                                         node_id,
1025                                                         msg: msg,
1026                                                         commitment_msg: commitment_msg,
1027                                                 });
1028                                         },
1029                                         None => {},
1030                                 }
1031
1032                                 true
1033                         },
1034                 }
1035         }
1036
1037         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
1038         /// generating message events for the net layer to claim the payment, if possible. Thus, you
1039         /// should probably kick the net layer to go send messages if this returns true!
1040         /// May panic if called except in response to a PaymentReceived event.
1041         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
1042                 self.claim_funds_internal(payment_preimage, true)
1043         }
1044         fn claim_funds_internal(&self, payment_preimage: [u8; 32], from_user: bool) -> bool {
1045                 let mut sha = Sha256::new();
1046                 sha.input(&payment_preimage);
1047                 let mut payment_hash = [0; 32];
1048                 sha.result(&mut payment_hash);
1049
1050                 let mut channel_state = self.channel_state.lock().unwrap();
1051                 let mut pending_htlc = {
1052                         match channel_state.claimable_htlcs.remove(&payment_hash) {
1053                                 Some(pending_htlc) => pending_htlc,
1054                                 None => return false,
1055                         }
1056                 };
1057
1058                 match pending_htlc {
1059                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route, session_priv } => {
1060                                 if from_user { // This was the end hop back to us
1061                                         pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
1062                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute { route, session_priv });
1063                                 } else { // This came from the first upstream node
1064                                         // Bank error in our favor! Maybe we should tell the user this somehow???
1065                                         pending_htlc = PendingOutboundHTLC::OutboundRoute { route, session_priv };
1066                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret });
1067                                 }
1068                         },
1069                         _ => {},
1070                 }
1071
1072                 match pending_htlc {
1073                         PendingOutboundHTLC::CycledRoute { .. } => unreachable!(),
1074                         PendingOutboundHTLC::OutboundRoute { .. } => {
1075                                 if from_user {
1076                                         panic!("Called claim_funds with a preimage for an outgoing payment. There is nothing we can do with this, and something is seriously wrong if you knew this...");
1077                                 }
1078                                 mem::drop(channel_state);
1079                                 let mut pending_events = self.pending_events.lock().unwrap();
1080                                 pending_events.push(events::Event::PaymentSent {
1081                                         payment_preimage
1082                                 });
1083                                 false
1084                         },
1085                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, .. } => {
1086                                 let (node_id, fulfill_msgs) = {
1087                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
1088                                                 Some(chan_id) => chan_id.clone(),
1089                                                 None => {
1090                                                         // TODO: There is probably a channel manager somewhere that needs to
1091                                                         // learn the preimage as the channel already hit the chain and that's
1092                                                         // why its missing.
1093                                                         return false
1094                                                 }
1095                                         };
1096
1097                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
1098                                         match chan.get_update_fulfill_htlc_and_commit(payment_preimage) {
1099                                                 Ok(msg) => (chan.get_their_node_id(), msg),
1100                                                 Err(_e) => {
1101                                                         // TODO: There is probably a channel manager somewhere that needs to
1102                                                         // learn the preimage as the channel may be about to hit the chain.
1103                                                         //TODO: Do something with e?
1104                                                         return false;
1105                                                 },
1106                                         }
1107                                 };
1108
1109                                 mem::drop(channel_state);
1110                                 if let Some(chan_monitor) = fulfill_msgs.1 {
1111                                         if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1112                                                 unimplemented!();// but def dont push the event...
1113                                         }
1114                                 }
1115
1116                                 if let Some((msg, commitment_msg)) = fulfill_msgs.0 {
1117                                         let mut pending_events = self.pending_events.lock().unwrap();
1118                                         pending_events.push(events::Event::SendFulfillHTLC {
1119                                                 node_id: node_id,
1120                                                 msg,
1121                                                 commitment_msg,
1122                                         });
1123                                 }
1124                                 true
1125                         },
1126                 }
1127         }
1128
1129         /// Gets the node_id held by this ChannelManager
1130         pub fn get_our_node_id(&self) -> PublicKey {
1131                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap()
1132         }
1133
1134         /// Used to restore channels to normal operation after a
1135         /// ChannelMonitorUpdateErr::TemporaryFailure was returned from a channel monitor update
1136         /// operation.
1137         pub fn test_restore_channel_monitor(&self) {
1138                 unimplemented!();
1139         }
1140 }
1141
1142 impl events::EventsProvider for ChannelManager {
1143         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
1144                 let mut pending_events = self.pending_events.lock().unwrap();
1145                 let mut ret = Vec::new();
1146                 mem::swap(&mut ret, &mut *pending_events);
1147                 ret
1148         }
1149 }
1150
1151 impl ChainListener for ChannelManager {
1152         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
1153                 let mut new_events = Vec::new();
1154                 let mut failed_channels = Vec::new();
1155                 {
1156                         let mut channel_lock = self.channel_state.lock().unwrap();
1157                         let channel_state = channel_lock.borrow_parts();
1158                         let short_to_id = channel_state.short_to_id;
1159                         channel_state.by_id.retain(|_, channel| {
1160                                 let chan_res = channel.block_connected(header, height, txn_matched, indexes_of_txn_matched);
1161                                 if let Ok(Some(funding_locked)) = chan_res {
1162                                         let announcement_sigs = match self.get_announcement_sigs(channel) {
1163                                                 Ok(res) => res,
1164                                                 Err(e) => {
1165                                                         log_error!(self, "Got error handling message: {}!", e.err);
1166                                                         //TODO: push e on events and blow up the channel (it has bad keys)
1167                                                         return true;
1168                                                 }
1169                                         };
1170                                         new_events.push(events::Event::SendFundingLocked {
1171                                                 node_id: channel.get_their_node_id(),
1172                                                 msg: funding_locked,
1173                                                 announcement_sigs: announcement_sigs
1174                                         });
1175                                         short_to_id.insert(channel.get_short_channel_id().unwrap(), channel.channel_id());
1176                                 } else if let Err(e) = chan_res {
1177                                         new_events.push(events::Event::HandleError {
1178                                                 node_id: channel.get_their_node_id(),
1179                                                 action: e.action,
1180                                         });
1181                                         if channel.is_shutdown() {
1182                                                 return false;
1183                                         }
1184                                 }
1185                                 if let Some(funding_txo) = channel.get_funding_txo() {
1186                                         for tx in txn_matched {
1187                                                 for inp in tx.input.iter() {
1188                                                         if inp.prev_hash == funding_txo.txid && inp.prev_index == funding_txo.index as u32 {
1189                                                                 if let Some(short_id) = channel.get_short_channel_id() {
1190                                                                         short_to_id.remove(&short_id);
1191                                                                 }
1192                                                                 // It looks like our counterparty went on-chain. We go ahead and
1193                                                                 // broadcast our latest local state as well here, just in case its
1194                                                                 // some kind of SPV attack, though we expect these to be dropped.
1195                                                                 failed_channels.push(channel.force_shutdown());
1196                                                                 if let Ok(update) = self.get_channel_update(&channel) {
1197                                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1198                                                                                 msg: update
1199                                                                         });
1200                                                                 }
1201                                                                 return false;
1202                                                         }
1203                                                 }
1204                                         }
1205                                 }
1206                                 if channel.is_funding_initiated() && channel.channel_monitor().would_broadcast_at_height(height) {
1207                                         if let Some(short_id) = channel.get_short_channel_id() {
1208                                                 short_to_id.remove(&short_id);
1209                                         }
1210                                         failed_channels.push(channel.force_shutdown());
1211                                         // If would_broadcast_at_height() is true, the channel_monitor will broadcast
1212                                         // the latest local tx for us, so we should skip that here (it doesn't really
1213                                         // hurt anything, but does make tests a bit simpler).
1214                                         failed_channels.last_mut().unwrap().0 = Vec::new();
1215                                         if let Ok(update) = self.get_channel_update(&channel) {
1216                                                 new_events.push(events::Event::BroadcastChannelUpdate {
1217                                                         msg: update
1218                                                 });
1219                                         }
1220                                         return false;
1221                                 }
1222                                 true
1223                         });
1224                 }
1225                 for failure in failed_channels.drain(..) {
1226                         self.finish_force_close_channel(failure);
1227                 }
1228                 let mut pending_events = self.pending_events.lock().unwrap();
1229                 for funding_locked in new_events.drain(..) {
1230                         pending_events.push(funding_locked);
1231                 }
1232                 self.latest_block_height.store(height as usize, Ordering::Release);
1233         }
1234
1235         /// We force-close the channel without letting our counterparty participate in the shutdown
1236         fn block_disconnected(&self, header: &BlockHeader) {
1237                 let mut new_events = Vec::new();
1238                 let mut failed_channels = Vec::new();
1239                 {
1240                         let mut channel_lock = self.channel_state.lock().unwrap();
1241                         let channel_state = channel_lock.borrow_parts();
1242                         let short_to_id = channel_state.short_to_id;
1243                         channel_state.by_id.retain(|_,  v| {
1244                                 if v.block_disconnected(header) {
1245                                         if let Some(short_id) = v.get_short_channel_id() {
1246                                                 short_to_id.remove(&short_id);
1247                                         }
1248                                         failed_channels.push(v.force_shutdown());
1249                                         if let Ok(update) = self.get_channel_update(&v) {
1250                                                 new_events.push(events::Event::BroadcastChannelUpdate {
1251                                                         msg: update
1252                                                 });
1253                                         }
1254                                         false
1255                                 } else {
1256                                         true
1257                                 }
1258                         });
1259                 }
1260                 for failure in failed_channels.drain(..) {
1261                         self.finish_force_close_channel(failure);
1262                 }
1263                 if !new_events.is_empty() {
1264                         let mut pending_events = self.pending_events.lock().unwrap();
1265                         for funding_locked in new_events.drain(..) {
1266                                 pending_events.push(funding_locked);
1267                         }
1268                 }
1269                 self.latest_block_height.fetch_sub(1, Ordering::AcqRel);
1270         }
1271 }
1272
1273 impl ChannelMessageHandler for ChannelManager {
1274         //TODO: Handle errors and close channel (or so)
1275         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, HandleError> {
1276                 if msg.chain_hash != self.genesis_hash {
1277                         return Err(HandleError{err: "Unknown genesis block hash", action: None});
1278                 }
1279                 let mut channel_state = self.channel_state.lock().unwrap();
1280                 if channel_state.by_id.contains_key(&msg.temporary_channel_id) {
1281                         return Err(HandleError{err: "temporary_channel_id collision!", action: None});
1282                 }
1283
1284                 let chan_keys = if cfg!(feature = "fuzztarget") {
1285                         ChannelKeys {
1286                                 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(),
1287                                 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(),
1288                                 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(),
1289                                 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(),
1290                                 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(),
1291                                 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(),
1292                                 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(),
1293                                 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],
1294                         }
1295                 } else {
1296                         let mut key_seed = [0u8; 32];
1297                         rng::fill_bytes(&mut key_seed);
1298                         match ChannelKeys::new_from_seed(&key_seed) {
1299                                 Ok(key) => key,
1300                                 Err(_) => panic!("RNG is busted!")
1301                         }
1302                 };
1303
1304                 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))?;
1305                 let accept_msg = channel.get_accept_channel()?;
1306                 channel_state.by_id.insert(channel.channel_id(), channel);
1307                 Ok(accept_msg)
1308         }
1309
1310         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
1311                 let (value, output_script, user_id) = {
1312                         let mut channel_state = self.channel_state.lock().unwrap();
1313                         match channel_state.by_id.get_mut(&msg.temporary_channel_id) {
1314                                 Some(chan) => {
1315                                         if chan.get_their_node_id() != *their_node_id {
1316                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1317                                         }
1318                                         chan.accept_channel(&msg)?;
1319                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
1320                                 },
1321                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1322                         }
1323                 };
1324                 let mut pending_events = self.pending_events.lock().unwrap();
1325                 pending_events.push(events::Event::FundingGenerationReady {
1326                         temporary_channel_id: msg.temporary_channel_id,
1327                         channel_value_satoshis: value,
1328                         output_script: output_script,
1329                         user_channel_id: user_id,
1330                 });
1331                 Ok(())
1332         }
1333
1334         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
1335                 let (chan, funding_msg, monitor_update) = {
1336                         let mut channel_state = self.channel_state.lock().unwrap();
1337                         match channel_state.by_id.entry(msg.temporary_channel_id.clone()) {
1338                                 hash_map::Entry::Occupied(mut chan) => {
1339                                         if chan.get().get_their_node_id() != *their_node_id {
1340                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1341                                         }
1342                                         match chan.get_mut().funding_created(msg) {
1343                                                 Ok((funding_msg, monitor_update)) => {
1344                                                         (chan.remove(), funding_msg, monitor_update)
1345                                                 },
1346                                                 Err(e) => {
1347                                                         //TODO: Possibly remove the channel depending on e.action
1348                                                         return Err(e);
1349                                                 }
1350                                         }
1351                                 },
1352                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1353                         }
1354                 }; // Release channel lock for install_watch_outpoint call,
1355                    // note that this means if the remote end is misbehaving and sends a message for the same
1356                    // channel back-to-back with funding_created, we'll end up thinking they sent a message
1357                    // for a bogus channel.
1358                 if let Err(_e) = self.monitor.add_update_monitor(monitor_update.get_funding_txo().unwrap(), monitor_update) {
1359                         unimplemented!();
1360                 }
1361                 let mut channel_state = self.channel_state.lock().unwrap();
1362                 match channel_state.by_id.entry(funding_msg.channel_id) {
1363                         hash_map::Entry::Occupied(_) => {
1364                                 return Err(HandleError {
1365                                         err: "Duplicate channel_id!",
1366                                         action: Some(msgs::ErrorAction::SendErrorMessage { msg: msgs::ErrorMessage { channel_id: funding_msg.channel_id, data: "Already had channel with the new channel_id".to_owned() } })
1367                                 });
1368                         },
1369                         hash_map::Entry::Vacant(e) => {
1370                                 e.insert(chan);
1371                         }
1372                 }
1373                 Ok(funding_msg)
1374         }
1375
1376         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
1377                 let (funding_txo, user_id, monitor) = {
1378                         let mut channel_state = self.channel_state.lock().unwrap();
1379                         match channel_state.by_id.get_mut(&msg.channel_id) {
1380                                 Some(chan) => {
1381                                         if chan.get_their_node_id() != *their_node_id {
1382                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1383                                         }
1384                                         let chan_monitor = chan.funding_signed(&msg)?;
1385                                         (chan.get_funding_txo().unwrap(), chan.get_user_id(), chan_monitor)
1386                                 },
1387                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1388                         }
1389                 };
1390                 if let Err(_e) = self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor) {
1391                         unimplemented!();
1392                 }
1393                 let mut pending_events = self.pending_events.lock().unwrap();
1394                 pending_events.push(events::Event::FundingBroadcastSafe {
1395                         funding_txo: funding_txo,
1396                         user_channel_id: user_id,
1397                 });
1398                 Ok(())
1399         }
1400
1401         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
1402                 let mut channel_state = self.channel_state.lock().unwrap();
1403                 match channel_state.by_id.get_mut(&msg.channel_id) {
1404                         Some(chan) => {
1405                                 if chan.get_their_node_id() != *their_node_id {
1406                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1407                                 }
1408                                 chan.funding_locked(&msg)?;
1409                                 return Ok(self.get_announcement_sigs(chan)?);
1410                         },
1411                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1412                 };
1413         }
1414
1415         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), HandleError> {
1416                 let (res, chan_option) = {
1417                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1418                         let channel_state = channel_state_lock.borrow_parts();
1419
1420                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1421                                 hash_map::Entry::Occupied(mut chan_entry) => {
1422                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1423                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1424                                         }
1425                                         let res = chan_entry.get_mut().shutdown(&*self.fee_estimator, &msg)?;
1426                                         if chan_entry.get().is_shutdown() {
1427                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1428                                                         channel_state.short_to_id.remove(&short_id);
1429                                                 }
1430                                                 (res, Some(chan_entry.remove_entry().1))
1431                                         } else { (res, None) }
1432                                 },
1433                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1434                         }
1435                 };
1436                 for payment_hash in res.2 {
1437                         // unknown_next_peer...I dunno who that is anymore....
1438                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
1439                 }
1440                 if let Some(chan) = chan_option {
1441                         if let Ok(update) = self.get_channel_update(&chan) {
1442                                 let mut events = self.pending_events.lock().unwrap();
1443                                 events.push(events::Event::BroadcastChannelUpdate {
1444                                         msg: update
1445                                 });
1446                         }
1447                 }
1448                 Ok((res.0, res.1))
1449         }
1450
1451         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, HandleError> {
1452                 let (res, chan_option) = {
1453                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1454                         let channel_state = channel_state_lock.borrow_parts();
1455                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1456                                 hash_map::Entry::Occupied(mut chan_entry) => {
1457                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1458                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1459                                         }
1460                                         let res = chan_entry.get_mut().closing_signed(&*self.fee_estimator, &msg)?;
1461                                         if res.1.is_some() {
1462                                                 // We're done with this channel, we've got a signed closing transaction and
1463                                                 // will send the closing_signed back to the remote peer upon return. This
1464                                                 // also implies there are no pending HTLCs left on the channel, so we can
1465                                                 // fully delete it from tracking (the channel monitor is still around to
1466                                                 // watch for old state broadcasts)!
1467                                                 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
1468                                                         channel_state.short_to_id.remove(&short_id);
1469                                                 }
1470                                                 (res, Some(chan_entry.remove_entry().1))
1471                                         } else { (res, None) }
1472                                 },
1473                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1474                         }
1475                 };
1476                 if let Some(broadcast_tx) = res.1 {
1477                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1478                 }
1479                 if let Some(chan) = chan_option {
1480                         if let Ok(update) = self.get_channel_update(&chan) {
1481                                 let mut events = self.pending_events.lock().unwrap();
1482                                 events.push(events::Event::BroadcastChannelUpdate {
1483                                         msg: update
1484                                 });
1485                         }
1486                 }
1487                 Ok(res.0)
1488         }
1489
1490         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
1491                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
1492                 //determine the state of the payment based on our response/if we forward anything/the time
1493                 //we take to respond. We should take care to avoid allowing such an attack.
1494                 //
1495                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
1496                 //us repeatedly garbled in different ways, and compare our error messages, which are
1497                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
1498                 //but we should prevent it anyway.
1499
1500                 let shared_secret = SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key, &self.our_network_key);
1501                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
1502
1503                 macro_rules! get_onion_hash {
1504                         () => {
1505                                 {
1506                                         let mut sha = Sha256::new();
1507                                         sha.input(&msg.onion_routing_packet.hop_data);
1508                                         let mut onion_hash = [0; 32];
1509                                         sha.result(&mut onion_hash);
1510                                         onion_hash
1511                                 }
1512                         }
1513                 }
1514
1515                 macro_rules! return_err {
1516                         ($msg: expr, $err_code: expr, $data: expr) => {
1517                                 return Err(msgs::HandleError {
1518                                         err: $msg,
1519                                         action: Some(msgs::ErrorAction::UpdateFailHTLC {
1520                                                 msg: msgs::UpdateFailHTLC {
1521                                                         channel_id: msg.channel_id,
1522                                                         htlc_id: msg.htlc_id,
1523                                                         reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
1524                                                 }
1525                                         }),
1526                                 });
1527                         }
1528                 }
1529
1530                 if msg.onion_routing_packet.version != 0 {
1531                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
1532                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
1533                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
1534                         //receiving node would have to brute force to figure out which version was put in the
1535                         //packet by the node that send us the message, in the case of hashing the hop_data, the
1536                         //node knows the HMAC matched, so they already know what is there...
1537                         return_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4, &get_onion_hash!());
1538                 }
1539
1540                 let mut hmac = Hmac::new(Sha256::new(), &mu);
1541                 hmac.input(&msg.onion_routing_packet.hop_data);
1542                 hmac.input(&msg.payment_hash);
1543                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
1544                         return_err!("HMAC Check failed", 0x8000 | 0x4000 | 5, &get_onion_hash!());
1545                 }
1546
1547                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
1548                 let next_hop_data = {
1549                         let mut decoded = [0; 65];
1550                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
1551                         match msgs::OnionHopData::decode(&decoded[..]) {
1552                                 Err(err) => {
1553                                         let error_code = match err {
1554                                                 msgs::DecodeError::UnknownRealmByte => 0x4000 | 1,
1555                                                 _ => 0x2000 | 2, // Should never happen
1556                                         };
1557                                         return_err!("Unable to decode our hop data", error_code, &[0;0]);
1558                                 },
1559                                 Ok(msg) => msg
1560                         }
1561                 };
1562
1563                 //TODO: Check that msg.cltv_expiry is within acceptable bounds!
1564
1565                 let mut pending_forward_info = if next_hop_data.hmac == [0; 32] {
1566                                 // OUR PAYMENT!
1567                                 if next_hop_data.data.amt_to_forward != msg.amount_msat {
1568                                         return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
1569                                 }
1570                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
1571                                         return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
1572                                 }
1573
1574                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
1575                                 // message, however that would leak that we are the recipient of this payment, so
1576                                 // instead we stay symmetric with the forwarding case, only responding (after a
1577                                 // delay) once they've send us a commitment_signed!
1578
1579                                 PendingForwardHTLCInfo {
1580                                         onion_packet: None,
1581                                         payment_hash: msg.payment_hash.clone(),
1582                                         short_channel_id: 0,
1583                                         prev_short_channel_id: 0,
1584                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1585                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1586                                 }
1587                         } else {
1588                                 let mut new_packet_data = [0; 20*65];
1589                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
1590                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
1591
1592                                 let mut new_pubkey = msg.onion_routing_packet.public_key.clone();
1593
1594                                 let blinding_factor = {
1595                                         let mut sha = Sha256::new();
1596                                         sha.input(&new_pubkey.serialize()[..]);
1597                                         sha.input(&shared_secret[..]);
1598                                         let mut res = [0u8; 32];
1599                                         sha.result(&mut res);
1600                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
1601                                                 Err(_) => {
1602                                                         // Return temporary node failure as its technically our issue, not the
1603                                                         // channel's issue.
1604                                                         return_err!("Blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1605                                                 },
1606                                                 Ok(key) => key
1607                                         }
1608                                 };
1609
1610                                 match new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
1611                                         Err(_) => {
1612                                                 // Return temporary node failure as its technically our issue, not the
1613                                                 // channel's issue.
1614                                                 return_err!("New blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1615                                         },
1616                                         Ok(_) => {}
1617                                 };
1618
1619                                 let outgoing_packet = msgs::OnionPacket {
1620                                         version: 0,
1621                                         public_key: new_pubkey,
1622                                         hop_data: new_packet_data,
1623                                         hmac: next_hop_data.hmac.clone(),
1624                                 };
1625
1626                                 //TODO: Check amt_to_forward and outgoing_cltv_value are within acceptable ranges!
1627
1628                                 PendingForwardHTLCInfo {
1629                                         onion_packet: Some(outgoing_packet),
1630                                         payment_hash: msg.payment_hash.clone(),
1631                                         short_channel_id: next_hop_data.data.short_channel_id,
1632                                         prev_short_channel_id: 0,
1633                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1634                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1635                                 }
1636                         };
1637
1638                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1639                 let channel_state = channel_state_lock.borrow_parts();
1640
1641                 if pending_forward_info.onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
1642                         let forwarding_id = match channel_state.short_to_id.get(&pending_forward_info.short_channel_id) {
1643                                 None => {
1644                                         return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
1645                                 },
1646                                 Some(id) => id.clone(),
1647                         };
1648                         let chan = channel_state.by_id.get_mut(&forwarding_id).unwrap();
1649                         if !chan.is_live() {
1650                                 let chan_update = self.get_channel_update(chan).unwrap();
1651                                 return_err!("Forwarding channel is not in a ready state.", 0x1000 | 7, &chan_update.encode_with_len()[..]);
1652                         }
1653                 }
1654
1655                 let claimable_htlcs_entry = channel_state.claimable_htlcs.entry(msg.payment_hash.clone());
1656
1657                 // We dont correctly handle payments that route through us twice on their way to their
1658                 // destination. That's OK since those nodes are probably busted or trying to do network
1659                 // mapping through repeated loops. In either case, we want them to stop talking to us, so
1660                 // we send permanent_node_failure.
1661                 if let &hash_map::Entry::Occupied(ref e) = &claimable_htlcs_entry {
1662                         let mut acceptable_cycle = false;
1663                         if let &PendingOutboundHTLC::OutboundRoute { .. } = e.get() {
1664                                 acceptable_cycle = pending_forward_info.short_channel_id == 0;
1665                         }
1666                         if !acceptable_cycle {
1667                                 return_err!("Payment looped through us twice", 0x4000 | 0x2000 | 2, &[0;0]);
1668                         }
1669                 }
1670
1671                 let (source_short_channel_id, res) = match channel_state.by_id.get_mut(&msg.channel_id) {
1672                         Some(chan) => {
1673                                 if chan.get_their_node_id() != *their_node_id {
1674                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1675                                 }
1676                                 if !chan.is_usable() {
1677                                         return Err(HandleError{err: "Channel not yet available for receiving HTLCs", action: None});
1678                                 }
1679                                 let short_channel_id = chan.get_short_channel_id().unwrap();
1680                                 pending_forward_info.prev_short_channel_id = short_channel_id;
1681                                 (short_channel_id, chan.update_add_htlc(&msg, pending_forward_info)?)
1682                         },
1683                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None}),
1684                 };
1685
1686                 match claimable_htlcs_entry {
1687                         hash_map::Entry::Occupied(mut e) => {
1688                                 let outbound_route = e.get_mut();
1689                                 let (route, session_priv) = match outbound_route {
1690                                         &mut PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1691                                                 (route.clone(), session_priv.clone())
1692                                         },
1693                                         _ => unreachable!(),
1694                                 };
1695                                 *outbound_route = PendingOutboundHTLC::CycledRoute {
1696                                         source_short_channel_id,
1697                                         incoming_packet_shared_secret: shared_secret,
1698                                         route,
1699                                         session_priv,
1700                                 };
1701                         },
1702                         hash_map::Entry::Vacant(e) => {
1703                                 e.insert(PendingOutboundHTLC::IntermediaryHopData {
1704                                         source_short_channel_id,
1705                                         incoming_packet_shared_secret: shared_secret,
1706                                 });
1707                         }
1708                 }
1709
1710                 Ok(res)
1711         }
1712
1713         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
1714                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1715                 // Claim funds first, cause we don't really care if the channel we received the message on
1716                 // is broken, we may have enough info to get our own money!
1717                 self.claim_funds_internal(msg.payment_preimage.clone(), false);
1718
1719                 let mut channel_state = self.channel_state.lock().unwrap();
1720                 match channel_state.by_id.get_mut(&msg.channel_id) {
1721                         Some(chan) => {
1722                                 if chan.get_their_node_id() != *their_node_id {
1723                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1724                                 }
1725                                 chan.update_fulfill_htlc(&msg)
1726                         },
1727                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1728                 }
1729         }
1730
1731         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<Option<msgs::HTLCFailChannelUpdate>, HandleError> {
1732                 let mut channel_state = self.channel_state.lock().unwrap();
1733                 let payment_hash = match channel_state.by_id.get_mut(&msg.channel_id) {
1734                         Some(chan) => {
1735                                 if chan.get_their_node_id() != *their_node_id {
1736                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1737                                 }
1738                                 chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() })
1739                         },
1740                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1741                 }?;
1742
1743                 if let Some(pending_htlc) = channel_state.claimable_htlcs.get(&payment_hash) {
1744                         match pending_htlc {
1745                                 &PendingOutboundHTLC::OutboundRoute { ref route, ref session_priv } => {
1746                                         // Handle packed channel/node updates for passing back for the route handler
1747                                         let mut packet_decrypted = msg.reason.data.clone();
1748                                         let mut res = None;
1749                                         Self::construct_onion_keys_callback(&self.secp_ctx, &route, &session_priv, |shared_secret, _, _, route_hop| {
1750                                                 if res.is_some() { return; }
1751
1752                                                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
1753
1754                                                 let mut decryption_tmp = Vec::with_capacity(packet_decrypted.len());
1755                                                 decryption_tmp.resize(packet_decrypted.len(), 0);
1756                                                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
1757                                                 chacha.process(&packet_decrypted, &mut decryption_tmp[..]);
1758                                                 packet_decrypted = decryption_tmp;
1759
1760                                                 if let Ok(err_packet) = msgs::DecodedOnionErrorPacket::decode(&packet_decrypted) {
1761                                                         if err_packet.failuremsg.len() >= 2 {
1762                                                                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
1763
1764                                                                 let mut hmac = Hmac::new(Sha256::new(), &um);
1765                                                                 hmac.input(&err_packet.encode()[32..]);
1766                                                                 let mut calc_tag = [0u8; 32];
1767                                                                 hmac.raw_result(&mut calc_tag);
1768                                                                 if crypto::util::fixed_time_eq(&calc_tag, &err_packet.hmac) {
1769                                                                         const UNKNOWN_CHAN: u16 = 0x4000|10;
1770                                                                         const TEMP_CHAN_FAILURE: u16 = 0x4000|7;
1771                                                                         match byte_utils::slice_to_be16(&err_packet.failuremsg[0..2]) {
1772                                                                                 TEMP_CHAN_FAILURE => {
1773                                                                                         if err_packet.failuremsg.len() >= 4 {
1774                                                                                                 let update_len = byte_utils::slice_to_be16(&err_packet.failuremsg[2..4]) as usize;
1775                                                                                                 if err_packet.failuremsg.len() >= 4 + update_len {
1776                                                                                                         if let Ok(chan_update) = msgs::ChannelUpdate::decode(&err_packet.failuremsg[4..4 + update_len]) {
1777                                                                                                                 res = Some(msgs::HTLCFailChannelUpdate::ChannelUpdateMessage {
1778                                                                                                                         msg: chan_update,
1779                                                                                                                 });
1780                                                                                                         }
1781                                                                                                 }
1782                                                                                         }
1783                                                                                 },
1784                                                                                 UNKNOWN_CHAN => {
1785                                                                                         // No such next-hop. We know this came from the
1786                                                                                         // current node as the HMAC validated.
1787                                                                                         res = Some(msgs::HTLCFailChannelUpdate::ChannelClosed {
1788                                                                                                 short_channel_id: route_hop.short_channel_id
1789                                                                                         });
1790                                                                                 },
1791                                                                                 _ => {}, //TODO: Enumerate all of these!
1792                                                                         }
1793                                                                 }
1794                                                         }
1795                                                 }
1796                                         }).unwrap();
1797                                         Ok(res)
1798                                 },
1799                                 _ => { Ok(None) },
1800                         }
1801                 } else {
1802                         Ok(None)
1803                 }
1804         }
1805
1806         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> {
1807                 let mut channel_state = self.channel_state.lock().unwrap();
1808                 match channel_state.by_id.get_mut(&msg.channel_id) {
1809                         Some(chan) => {
1810                                 if chan.get_their_node_id() != *their_node_id {
1811                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1812                                 }
1813                                 chan.update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() })
1814                         },
1815                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1816                 }
1817         }
1818
1819         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), HandleError> {
1820                 let (revoke_and_ack, commitment_signed, chan_monitor) = {
1821                         let mut channel_state = self.channel_state.lock().unwrap();
1822                         match channel_state.by_id.get_mut(&msg.channel_id) {
1823                                 Some(chan) => {
1824                                         if chan.get_their_node_id() != *their_node_id {
1825                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1826                                         }
1827                                         chan.commitment_signed(&msg)?
1828                                 },
1829                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1830                         }
1831                 };
1832                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1833                         unimplemented!();
1834                 }
1835
1836                 Ok((revoke_and_ack, commitment_signed))
1837         }
1838
1839         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, HandleError> {
1840                 let (res, mut pending_forwards, mut pending_failures, chan_monitor) = {
1841                         let mut channel_state = self.channel_state.lock().unwrap();
1842                         match channel_state.by_id.get_mut(&msg.channel_id) {
1843                                 Some(chan) => {
1844                                         if chan.get_their_node_id() != *their_node_id {
1845                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1846                                         }
1847                                         chan.revoke_and_ack(&msg)?
1848                                 },
1849                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1850                         }
1851                 };
1852                 if let Err(_e) = self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1853                         unimplemented!();
1854                 }
1855                 for failure in pending_failures.drain(..) {
1856                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failure.0, failure.1);
1857                 }
1858
1859                 let mut forward_event = None;
1860                 if !pending_forwards.is_empty() {
1861                         let mut channel_state = self.channel_state.lock().unwrap();
1862                         if channel_state.forward_htlcs.is_empty() {
1863                                 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));
1864                                 channel_state.next_forward = forward_event.unwrap();
1865                         }
1866                         for forward_info in pending_forwards.drain(..) {
1867                                 match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
1868                                         hash_map::Entry::Occupied(mut entry) => {
1869                                                 entry.get_mut().push(forward_info);
1870                                         },
1871                                         hash_map::Entry::Vacant(entry) => {
1872                                                 entry.insert(vec!(forward_info));
1873                                         }
1874                                 }
1875                         }
1876                 }
1877                 match forward_event {
1878                         Some(time) => {
1879                                 let mut pending_events = self.pending_events.lock().unwrap();
1880                                 pending_events.push(events::Event::PendingHTLCsForwardable {
1881                                         time_forwardable: time
1882                                 });
1883                         }
1884                         None => {},
1885                 }
1886
1887                 Ok(res)
1888         }
1889
1890         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1891                 let mut channel_state = self.channel_state.lock().unwrap();
1892                 match channel_state.by_id.get_mut(&msg.channel_id) {
1893                         Some(chan) => {
1894                                 if chan.get_their_node_id() != *their_node_id {
1895                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1896                                 }
1897                                 chan.update_fee(&*self.fee_estimator, &msg)
1898                         },
1899                         None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1900                 }
1901         }
1902
1903         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
1904                 let (chan_announcement, chan_update) = {
1905                         let mut channel_state = self.channel_state.lock().unwrap();
1906                         match channel_state.by_id.get_mut(&msg.channel_id) {
1907                                 Some(chan) => {
1908                                         if chan.get_their_node_id() != *their_node_id {
1909                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", action: None})
1910                                         }
1911                                         if !chan.is_usable() {
1912                                                 return Err(HandleError{err: "Got an announcement_signatures before we were ready for it", action: None });
1913                                         }
1914
1915                                         let our_node_id = self.get_our_node_id();
1916                                         let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())?;
1917
1918                                         let were_node_one = announcement.node_id_1 == our_node_id;
1919                                         let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1920                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }));
1921                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }));
1922
1923                                         let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
1924
1925                                         (msgs::ChannelAnnouncement {
1926                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
1927                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
1928                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
1929                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
1930                                                 contents: announcement,
1931                                         }, self.get_channel_update(chan).unwrap()) // can only fail if we're not in a ready state
1932                                 },
1933                                 None => return Err(HandleError{err: "Failed to find corresponding channel", action: None})
1934                         }
1935                 };
1936                 let mut pending_events = self.pending_events.lock().unwrap();
1937                 pending_events.push(events::Event::BroadcastChannelAnnouncement { msg: chan_announcement, update_msg: chan_update });
1938                 Ok(())
1939         }
1940
1941         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
1942                 let mut new_events = Vec::new();
1943                 let mut failed_channels = Vec::new();
1944                 {
1945                         let mut channel_state_lock = self.channel_state.lock().unwrap();
1946                         let channel_state = channel_state_lock.borrow_parts();
1947                         let short_to_id = channel_state.short_to_id;
1948                         if no_connection_possible {
1949                                 channel_state.by_id.retain(|_, chan| {
1950                                         if chan.get_their_node_id() == *their_node_id {
1951                                                 if let Some(short_id) = chan.get_short_channel_id() {
1952                                                         short_to_id.remove(&short_id);
1953                                                 }
1954                                                 failed_channels.push(chan.force_shutdown());
1955                                                 if let Ok(update) = self.get_channel_update(&chan) {
1956                                                         new_events.push(events::Event::BroadcastChannelUpdate {
1957                                                                 msg: update
1958                                                         });
1959                                                 }
1960                                                 false
1961                                         } else {
1962                                                 true
1963                                         }
1964                                 });
1965                         } else {
1966                                 for chan in channel_state.by_id {
1967                                         if chan.1.get_their_node_id() == *their_node_id {
1968                                                 //TODO: mark channel disabled (and maybe announce such after a timeout). Also
1969                                                 //fail and wipe any uncommitted outbound HTLCs as those are considered after
1970                                                 //reconnect.
1971                                         }
1972                                 }
1973                         }
1974                 }
1975                 for failure in failed_channels.drain(..) {
1976                         self.finish_force_close_channel(failure);
1977                 }
1978                 if !new_events.is_empty() {
1979                         let mut pending_events = self.pending_events.lock().unwrap();
1980                         for event in new_events.drain(..) {
1981                                 pending_events.push(event);
1982                         }
1983                 }
1984         }
1985 }
1986
1987 #[cfg(test)]
1988 mod tests {
1989         use chain::chaininterface;
1990         use chain::transaction::OutPoint;
1991         use chain::chaininterface::ChainListener;
1992         use ln::channelmanager::{ChannelManager,OnionKeys};
1993         use ln::router::{Route, RouteHop, Router};
1994         use ln::msgs;
1995         use ln::msgs::{MsgEncodable,ChannelMessageHandler,RoutingMessageHandler};
1996         use util::test_utils;
1997         use util::events::{Event, EventsProvider};
1998         use util::logger::Logger;
1999
2000         use bitcoin::util::hash::Sha256dHash;
2001         use bitcoin::blockdata::block::{Block, BlockHeader};
2002         use bitcoin::blockdata::transaction::{Transaction, TxOut};
2003         use bitcoin::network::constants::Network;
2004         use bitcoin::network::serialize::serialize;
2005         use bitcoin::network::serialize::BitcoinHash;
2006
2007         use hex;
2008
2009         use secp256k1::Secp256k1;
2010         use secp256k1::key::{PublicKey,SecretKey};
2011
2012         use crypto::sha2::Sha256;
2013         use crypto::digest::Digest;
2014
2015         use rand::{thread_rng,Rng};
2016
2017         use std::collections::HashMap;
2018         use std::default::Default;
2019         use std::sync::{Arc, Mutex};
2020         use std::time::Instant;
2021         use std::mem;
2022
2023         fn build_test_onion_keys() -> Vec<OnionKeys> {
2024                 // Keys from BOLT 4, used in both test vector tests
2025                 let secp_ctx = Secp256k1::new();
2026
2027                 let route = Route {
2028                         hops: vec!(
2029                                         RouteHop {
2030                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
2031                                                 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
2032                                         },
2033                                         RouteHop {
2034                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
2035                                                 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
2036                                         },
2037                                         RouteHop {
2038                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
2039                                                 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
2040                                         },
2041                                         RouteHop {
2042                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
2043                                                 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
2044                                         },
2045                                         RouteHop {
2046                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex::decode("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
2047                                                 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
2048                                         },
2049                         ),
2050                 };
2051
2052                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex::decode("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
2053
2054                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
2055                 assert_eq!(onion_keys.len(), route.hops.len());
2056                 onion_keys
2057         }
2058
2059         #[test]
2060         fn onion_vectors() {
2061                 // Packet creation test vectors from BOLT 4
2062                 let onion_keys = build_test_onion_keys();
2063
2064                 assert_eq!(onion_keys[0].shared_secret[..], hex::decode("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
2065                 assert_eq!(onion_keys[0].blinding_factor[..], hex::decode("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
2066                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex::decode("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
2067                 assert_eq!(onion_keys[0].rho, hex::decode("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
2068                 assert_eq!(onion_keys[0].mu, hex::decode("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
2069
2070                 assert_eq!(onion_keys[1].shared_secret[..], hex::decode("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
2071                 assert_eq!(onion_keys[1].blinding_factor[..], hex::decode("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
2072                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex::decode("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
2073                 assert_eq!(onion_keys[1].rho, hex::decode("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
2074                 assert_eq!(onion_keys[1].mu, hex::decode("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
2075
2076                 assert_eq!(onion_keys[2].shared_secret[..], hex::decode("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
2077                 assert_eq!(onion_keys[2].blinding_factor[..], hex::decode("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
2078                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex::decode("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
2079                 assert_eq!(onion_keys[2].rho, hex::decode("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
2080                 assert_eq!(onion_keys[2].mu, hex::decode("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
2081
2082                 assert_eq!(onion_keys[3].shared_secret[..], hex::decode("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
2083                 assert_eq!(onion_keys[3].blinding_factor[..], hex::decode("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
2084                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex::decode("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
2085                 assert_eq!(onion_keys[3].rho, hex::decode("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
2086                 assert_eq!(onion_keys[3].mu, hex::decode("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
2087
2088                 assert_eq!(onion_keys[4].shared_secret[..], hex::decode("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
2089                 assert_eq!(onion_keys[4].blinding_factor[..], hex::decode("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
2090                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex::decode("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
2091                 assert_eq!(onion_keys[4].rho, hex::decode("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
2092                 assert_eq!(onion_keys[4].mu, hex::decode("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
2093
2094                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
2095                 let payloads = vec!(
2096                         msgs::OnionHopData {
2097                                 realm: 0,
2098                                 data: msgs::OnionRealm0HopData {
2099                                         short_channel_id: 0,
2100                                         amt_to_forward: 0,
2101                                         outgoing_cltv_value: 0,
2102                                 },
2103                                 hmac: [0; 32],
2104                         },
2105                         msgs::OnionHopData {
2106                                 realm: 0,
2107                                 data: msgs::OnionRealm0HopData {
2108                                         short_channel_id: 0x0101010101010101,
2109                                         amt_to_forward: 0x0100000001,
2110                                         outgoing_cltv_value: 0,
2111                                 },
2112                                 hmac: [0; 32],
2113                         },
2114                         msgs::OnionHopData {
2115                                 realm: 0,
2116                                 data: msgs::OnionRealm0HopData {
2117                                         short_channel_id: 0x0202020202020202,
2118                                         amt_to_forward: 0x0200000002,
2119                                         outgoing_cltv_value: 0,
2120                                 },
2121                                 hmac: [0; 32],
2122                         },
2123                         msgs::OnionHopData {
2124                                 realm: 0,
2125                                 data: msgs::OnionRealm0HopData {
2126                                         short_channel_id: 0x0303030303030303,
2127                                         amt_to_forward: 0x0300000003,
2128                                         outgoing_cltv_value: 0,
2129                                 },
2130                                 hmac: [0; 32],
2131                         },
2132                         msgs::OnionHopData {
2133                                 realm: 0,
2134                                 data: msgs::OnionRealm0HopData {
2135                                         short_channel_id: 0x0404040404040404,
2136                                         amt_to_forward: 0x0400000004,
2137                                         outgoing_cltv_value: 0,
2138                                 },
2139                                 hmac: [0; 32],
2140                         },
2141                 );
2142
2143                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, &[0x42; 32]).unwrap();
2144                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
2145                 // anyway...
2146                 assert_eq!(packet.encode(), hex::decode("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").unwrap());
2147         }
2148
2149         #[test]
2150         fn test_failure_packet_onion() {
2151                 // Returning Errors test vectors from BOLT 4
2152
2153                 let onion_keys = build_test_onion_keys();
2154                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret, 0x2002, &[0; 0]);
2155                 assert_eq!(onion_error.encode(), hex::decode("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").unwrap());
2156
2157                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret, &onion_error.encode()[..]);
2158                 assert_eq!(onion_packet_1.data, hex::decode("a5e6bd0c74cb347f10cce367f949098f2457d14c046fd8a22cb96efb30b0fdcda8cb9168b50f2fd45edd73c1b0c8b33002df376801ff58aaa94000bf8a86f92620f343baef38a580102395ae3abf9128d1047a0736ff9b83d456740ebbb4aeb3aa9737f18fb4afb4aa074fb26c4d702f42968888550a3bded8c05247e045b866baef0499f079fdaeef6538f31d44deafffdfd3afa2fb4ca9082b8f1c465371a9894dd8c243fb4847e004f5256b3e90e2edde4c9fb3082ddfe4d1e734cacd96ef0706bf63c9984e22dc98851bcccd1c3494351feb458c9c6af41c0044bea3c47552b1d992ae542b17a2d0bba1a096c78d169034ecb55b6e3a7263c26017f033031228833c1daefc0dedb8cf7c3e37c9c37ebfe42f3225c326e8bcfd338804c145b16e34e4").unwrap());
2159
2160                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret, &onion_packet_1.data[..]);
2161                 assert_eq!(onion_packet_2.data, hex::decode("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").unwrap());
2162
2163                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret, &onion_packet_2.data[..]);
2164                 assert_eq!(onion_packet_3.data, hex::decode("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").unwrap());
2165
2166                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret, &onion_packet_3.data[..]);
2167                 assert_eq!(onion_packet_4.data, hex::decode("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").unwrap());
2168
2169                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret, &onion_packet_4.data[..]);
2170                 assert_eq!(onion_packet_5.data, hex::decode("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").unwrap());
2171         }
2172
2173         fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction, chan_id: u32) {
2174                 assert!(chain.does_match_tx(tx));
2175                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2176                 chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id; 1]);
2177                 for i in 2..100 {
2178                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2179                         chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
2180                 }
2181         }
2182
2183         struct Node {
2184                 feeest: Arc<test_utils::TestFeeEstimator>,
2185                 chain_monitor: Arc<chaininterface::ChainWatchInterfaceUtil>,
2186                 tx_broadcaster: Arc<test_utils::TestBroadcaster>,
2187                 chan_monitor: Arc<test_utils::TestChannelMonitor>,
2188                 node_id: SecretKey,
2189                 node: Arc<ChannelManager>,
2190                 router: Router,
2191         }
2192
2193         static mut CHAN_COUNT: u32 = 0;
2194         fn create_chan_between_nodes(node_a: &Node, node_b: &Node) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2195                 node_a.node.create_channel(node_b.node.get_our_node_id(), 100000, 42).unwrap();
2196
2197                 let events_1 = node_a.node.get_and_clear_pending_events();
2198                 assert_eq!(events_1.len(), 1);
2199                 let accept_chan = match events_1[0] {
2200                         Event::SendOpenChannel { ref node_id, ref msg } => {
2201                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2202                                 node_b.node.handle_open_channel(&node_a.node.get_our_node_id(), msg).unwrap()
2203                         },
2204                         _ => panic!("Unexpected event"),
2205                 };
2206
2207                 node_a.node.handle_accept_channel(&node_b.node.get_our_node_id(), &accept_chan).unwrap();
2208
2209                 let chan_id = unsafe { CHAN_COUNT };
2210                 let tx;
2211                 let funding_output;
2212
2213                 let events_2 = node_a.node.get_and_clear_pending_events();
2214                 assert_eq!(events_2.len(), 1);
2215                 match events_2[0] {
2216                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
2217                                 assert_eq!(*channel_value_satoshis, 100000);
2218                                 assert_eq!(user_channel_id, 42);
2219
2220                                 tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
2221                                         value: *channel_value_satoshis, script_pubkey: output_script.clone(),
2222                                 }]};
2223                                 funding_output = OutPoint::new(Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
2224
2225                                 node_a.node.funding_transaction_generated(&temporary_channel_id, funding_output);
2226                                 let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2227                                 assert_eq!(added_monitors.len(), 1);
2228                                 assert_eq!(added_monitors[0].0, funding_output);
2229                                 added_monitors.clear();
2230                         },
2231                         _ => panic!("Unexpected event"),
2232                 }
2233
2234                 let events_3 = node_a.node.get_and_clear_pending_events();
2235                 assert_eq!(events_3.len(), 1);
2236                 let funding_signed = match events_3[0] {
2237                         Event::SendFundingCreated { ref node_id, ref msg } => {
2238                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2239                                 let res = node_b.node.handle_funding_created(&node_a.node.get_our_node_id(), msg).unwrap();
2240                                 let mut added_monitors = node_b.chan_monitor.added_monitors.lock().unwrap();
2241                                 assert_eq!(added_monitors.len(), 1);
2242                                 assert_eq!(added_monitors[0].0, funding_output);
2243                                 added_monitors.clear();
2244                                 res
2245                         },
2246                         _ => panic!("Unexpected event"),
2247                 };
2248
2249                 node_a.node.handle_funding_signed(&node_b.node.get_our_node_id(), &funding_signed).unwrap();
2250                 {
2251                         let mut added_monitors = node_a.chan_monitor.added_monitors.lock().unwrap();
2252                         assert_eq!(added_monitors.len(), 1);
2253                         assert_eq!(added_monitors[0].0, funding_output);
2254                         added_monitors.clear();
2255                 }
2256
2257                 let events_4 = node_a.node.get_and_clear_pending_events();
2258                 assert_eq!(events_4.len(), 1);
2259                 match events_4[0] {
2260                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
2261                                 assert_eq!(user_channel_id, 42);
2262                                 assert_eq!(*funding_txo, funding_output);
2263                         },
2264                         _ => panic!("Unexpected event"),
2265                 };
2266
2267                 confirm_transaction(&node_a.chain_monitor, &tx, chan_id);
2268                 let events_5 = node_a.node.get_and_clear_pending_events();
2269                 assert_eq!(events_5.len(), 1);
2270                 match events_5[0] {
2271                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2272                                 assert_eq!(*node_id, node_b.node.get_our_node_id());
2273                                 assert!(announcement_sigs.is_none());
2274                                 node_b.node.handle_funding_locked(&node_a.node.get_our_node_id(), msg).unwrap()
2275                         },
2276                         _ => panic!("Unexpected event"),
2277                 };
2278
2279                 let channel_id;
2280
2281                 confirm_transaction(&node_b.chain_monitor, &tx, chan_id);
2282                 let events_6 = node_b.node.get_and_clear_pending_events();
2283                 assert_eq!(events_6.len(), 1);
2284                 let as_announcement_sigs = match events_6[0] {
2285                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
2286                                 assert_eq!(*node_id, node_a.node.get_our_node_id());
2287                                 channel_id = msg.channel_id.clone();
2288                                 let as_announcement_sigs = node_a.node.handle_funding_locked(&node_b.node.get_our_node_id(), msg).unwrap().unwrap();
2289                                 node_a.node.handle_announcement_signatures(&node_b.node.get_our_node_id(), &(*announcement_sigs).clone().unwrap()).unwrap();
2290                                 as_announcement_sigs
2291                         },
2292                         _ => panic!("Unexpected event"),
2293                 };
2294
2295                 let events_7 = node_a.node.get_and_clear_pending_events();
2296                 assert_eq!(events_7.len(), 1);
2297                 let (announcement, as_update) = match events_7[0] {
2298                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2299                                 (msg, update_msg)
2300                         },
2301                         _ => panic!("Unexpected event"),
2302                 };
2303
2304                 node_b.node.handle_announcement_signatures(&node_a.node.get_our_node_id(), &as_announcement_sigs).unwrap();
2305                 let events_8 = node_b.node.get_and_clear_pending_events();
2306                 assert_eq!(events_8.len(), 1);
2307                 let bs_update = match events_8[0] {
2308                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
2309                                 assert!(*announcement == *msg);
2310                                 update_msg
2311                         },
2312                         _ => panic!("Unexpected event"),
2313                 };
2314
2315                 unsafe {
2316                         CHAN_COUNT += 1;
2317                 }
2318
2319                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone(), channel_id, tx)
2320         }
2321
2322         fn create_announced_chan_between_nodes(nodes: &Vec<Node>, a: usize, b: usize) -> (msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction) {
2323                 let chan_announcement = create_chan_between_nodes(&nodes[a], &nodes[b]);
2324                 for node in nodes {
2325                         assert!(node.router.handle_channel_announcement(&chan_announcement.0).unwrap());
2326                         node.router.handle_channel_update(&chan_announcement.1).unwrap();
2327                         node.router.handle_channel_update(&chan_announcement.2).unwrap();
2328                 }
2329                 (chan_announcement.1, chan_announcement.2, chan_announcement.3, chan_announcement.4)
2330         }
2331
2332         fn close_channel(outbound_node: &Node, inbound_node: &Node, channel_id: &[u8; 32], funding_tx: Transaction, close_inbound_first: bool) -> (msgs::ChannelUpdate, msgs::ChannelUpdate) {
2333                 let (node_a, broadcaster_a) = if close_inbound_first { (&inbound_node.node, &inbound_node.tx_broadcaster) } else { (&outbound_node.node, &outbound_node.tx_broadcaster) };
2334                 let (node_b, broadcaster_b) = if close_inbound_first { (&outbound_node.node, &outbound_node.tx_broadcaster) } else { (&inbound_node.node, &inbound_node.tx_broadcaster) };
2335                 let (tx_a, tx_b);
2336
2337                 node_a.close_channel(channel_id).unwrap();
2338                 let events_1 = node_a.get_and_clear_pending_events();
2339                 assert_eq!(events_1.len(), 1);
2340                 let shutdown_a = match events_1[0] {
2341                         Event::SendShutdown { ref node_id, ref msg } => {
2342                                 assert_eq!(node_id, &node_b.get_our_node_id());
2343                                 msg.clone()
2344                         },
2345                         _ => panic!("Unexpected event"),
2346                 };
2347
2348                 let (shutdown_b, mut closing_signed_b) = node_b.handle_shutdown(&node_a.get_our_node_id(), &shutdown_a).unwrap();
2349                 if !close_inbound_first {
2350                         assert!(closing_signed_b.is_none());
2351                 }
2352                 let (empty_a, mut closing_signed_a) = node_a.handle_shutdown(&node_b.get_our_node_id(), &shutdown_b.unwrap()).unwrap();
2353                 assert!(empty_a.is_none());
2354                 if close_inbound_first {
2355                         assert!(closing_signed_a.is_none());
2356                         closing_signed_a = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2357                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2358                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2359
2360                         let empty_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2361                         assert!(empty_b.is_none());
2362                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2363                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2364                 } else {
2365                         closing_signed_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
2366                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
2367                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
2368
2369                         let empty_a2 = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
2370                         assert!(empty_a2.is_none());
2371                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
2372                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
2373                 }
2374                 assert_eq!(tx_a, tx_b);
2375                 let mut funding_tx_map = HashMap::new();
2376                 funding_tx_map.insert(funding_tx.txid(), funding_tx);
2377                 tx_a.verify(&funding_tx_map).unwrap();
2378
2379                 let events_2 = node_a.get_and_clear_pending_events();
2380                 assert_eq!(events_2.len(), 1);
2381                 let as_update = match events_2[0] {
2382                         Event::BroadcastChannelUpdate { ref msg } => {
2383                                 msg.clone()
2384                         },
2385                         _ => panic!("Unexpected event"),
2386                 };
2387
2388                 let events_3 = node_b.get_and_clear_pending_events();
2389                 assert_eq!(events_3.len(), 1);
2390                 let bs_update = match events_3[0] {
2391                         Event::BroadcastChannelUpdate { ref msg } => {
2392                                 msg.clone()
2393                         },
2394                         _ => panic!("Unexpected event"),
2395                 };
2396
2397                 (as_update, bs_update)
2398         }
2399
2400         struct SendEvent {
2401                 node_id: PublicKey,
2402                 msgs: Vec<msgs::UpdateAddHTLC>,
2403                 commitment_msg: msgs::CommitmentSigned,
2404         }
2405         impl SendEvent {
2406                 fn from_event(event: Event) -> SendEvent {
2407                         match event {
2408                                 Event::SendHTLCs { node_id, msgs, commitment_msg } => {
2409                                         SendEvent { node_id: node_id, msgs: msgs, commitment_msg: commitment_msg }
2410                                 },
2411                                 _ => panic!("Unexpected event type!"),
2412                         }
2413                 }
2414         }
2415
2416         static mut PAYMENT_COUNT: u8 = 0;
2417         fn send_along_route(origin_node: &Node, route: Route, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2418                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2419                 unsafe { PAYMENT_COUNT += 1 };
2420                 let our_payment_hash = {
2421                         let mut sha = Sha256::new();
2422                         sha.input(&our_payment_preimage[..]);
2423                         let mut ret = [0; 32];
2424                         sha.result(&mut ret);
2425                         ret
2426                 };
2427
2428                 let mut payment_event = {
2429                         origin_node.node.send_payment(route, our_payment_hash).unwrap();
2430                         {
2431                                 let mut added_monitors = origin_node.chan_monitor.added_monitors.lock().unwrap();
2432                                 assert_eq!(added_monitors.len(), 1);
2433                                 added_monitors.clear();
2434                         }
2435
2436                         let mut events = origin_node.node.get_and_clear_pending_events();
2437                         assert_eq!(events.len(), 1);
2438                         SendEvent::from_event(events.remove(0))
2439                 };
2440                 let mut prev_node = origin_node;
2441
2442                 for (idx, &node) in expected_route.iter().enumerate() {
2443                         assert_eq!(node.node.get_our_node_id(), payment_event.node_id);
2444
2445                         node.node.handle_update_add_htlc(&prev_node.node.get_our_node_id(), &payment_event.msgs[0]).unwrap();
2446                         {
2447                                 let added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2448                                 assert_eq!(added_monitors.len(), 0);
2449                         }
2450
2451                         let revoke_and_ack = node.node.handle_commitment_signed(&prev_node.node.get_our_node_id(), &payment_event.commitment_msg).unwrap();
2452                         {
2453                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2454                                 assert_eq!(added_monitors.len(), 1);
2455                                 added_monitors.clear();
2456                         }
2457                         assert!(prev_node.node.handle_revoke_and_ack(&node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2458                         let prev_revoke_and_ack = prev_node.node.handle_commitment_signed(&node.node.get_our_node_id(), &revoke_and_ack.1.unwrap()).unwrap();
2459                         {
2460                                 let mut added_monitors = prev_node.chan_monitor.added_monitors.lock().unwrap();
2461                                 assert_eq!(added_monitors.len(), 2);
2462                                 added_monitors.clear();
2463                         }
2464                         assert!(node.node.handle_revoke_and_ack(&prev_node.node.get_our_node_id(), &prev_revoke_and_ack.0).unwrap().is_none());
2465                         assert!(prev_revoke_and_ack.1.is_none());
2466                         {
2467                                 let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2468                                 assert_eq!(added_monitors.len(), 1);
2469                                 added_monitors.clear();
2470                         }
2471
2472                         let events_1 = node.node.get_and_clear_pending_events();
2473                         assert_eq!(events_1.len(), 1);
2474                         match events_1[0] {
2475                                 Event::PendingHTLCsForwardable { .. } => { },
2476                                 _ => panic!("Unexpected event"),
2477                         };
2478
2479                         node.node.channel_state.lock().unwrap().next_forward = Instant::now();
2480                         node.node.process_pending_htlc_forwards();
2481
2482                         let mut events_2 = node.node.get_and_clear_pending_events();
2483                         assert_eq!(events_2.len(), 1);
2484                         if idx == expected_route.len() - 1 {
2485                                 match events_2[0] {
2486                                         Event::PaymentReceived { ref payment_hash, amt } => {
2487                                                 assert_eq!(our_payment_hash, *payment_hash);
2488                                                 assert_eq!(amt, recv_value);
2489                                         },
2490                                         _ => panic!("Unexpected event"),
2491                                 }
2492                         } else {
2493                                 {
2494                                         let mut added_monitors = node.chan_monitor.added_monitors.lock().unwrap();
2495                                         assert_eq!(added_monitors.len(), 1);
2496                                         added_monitors.clear();
2497                                 }
2498                                 payment_event = SendEvent::from_event(events_2.remove(0));
2499                                 assert_eq!(payment_event.msgs.len(), 1);
2500                         }
2501
2502                         prev_node = node;
2503                 }
2504
2505                 (our_payment_preimage, our_payment_hash)
2506         }
2507
2508         fn claim_payment(origin_node: &Node, expected_route: &[&Node], our_payment_preimage: [u8; 32]) {
2509                 assert!(expected_route.last().unwrap().node.claim_funds(our_payment_preimage));
2510                 {
2511                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2512                         assert_eq!(added_monitors.len(), 1);
2513                         added_monitors.clear();
2514                 }
2515
2516                 let mut next_msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)> = None;
2517                 macro_rules! update_fulfill_dance {
2518                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2519                                 {
2520                                         $node.node.handle_update_fulfill_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2521                                         {
2522                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2523                                                 if $last_node {
2524                                                         assert_eq!(added_monitors.len(), 0);
2525                                                 } else {
2526                                                         assert_eq!(added_monitors.len(), 1);
2527                                                 }
2528                                                 added_monitors.clear();
2529                                         }
2530                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2531                                         {
2532                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2533                                                 assert_eq!(added_monitors.len(), 1);
2534                                                 added_monitors.clear();
2535                                         }
2536                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2537                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2538                                         assert!(revoke_and_ack.1.is_none());
2539                                         {
2540                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2541                                                 assert_eq!(added_monitors.len(), 2);
2542                                                 added_monitors.clear();
2543                                         }
2544                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2545                                         {
2546                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2547                                                 assert_eq!(added_monitors.len(), 1);
2548                                                 added_monitors.clear();
2549                                         }
2550                                 }
2551                         }
2552                 }
2553
2554                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2555                 let mut prev_node = expected_route.last().unwrap();
2556                 for node in expected_route.iter().rev() {
2557                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2558                         if next_msgs.is_some() {
2559                                 update_fulfill_dance!(node, prev_node, false);
2560                         }
2561
2562                         let events = node.node.get_and_clear_pending_events();
2563                         assert_eq!(events.len(), 1);
2564                         match events[0] {
2565                                 Event::SendFulfillHTLC { ref node_id, ref msg, ref commitment_msg } => {
2566                                         expected_next_node = node_id.clone();
2567                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2568                                 },
2569                                 _ => panic!("Unexpected event"),
2570                         };
2571
2572                         prev_node = node;
2573                 }
2574
2575                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2576                 update_fulfill_dance!(origin_node, expected_route.first().unwrap(), true);
2577
2578                 let events = origin_node.node.get_and_clear_pending_events();
2579                 assert_eq!(events.len(), 1);
2580                 match events[0] {
2581                         Event::PaymentSent { payment_preimage } => {
2582                                 assert_eq!(payment_preimage, our_payment_preimage);
2583                         },
2584                         _ => panic!("Unexpected event"),
2585                 }
2586         }
2587
2588         const TEST_FINAL_CLTV: u32 = 32;
2589
2590         fn route_payment(origin_node: &Node, expected_route: &[&Node], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2591                 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();
2592                 assert_eq!(route.hops.len(), expected_route.len());
2593                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2594                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2595                 }
2596
2597                 send_along_route(origin_node, route, expected_route, recv_value)
2598         }
2599
2600         fn route_over_limit(origin_node: &Node, expected_route: &[&Node], recv_value: u64) {
2601                 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();
2602                 assert_eq!(route.hops.len(), expected_route.len());
2603                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2604                         assert_eq!(hop.pubkey, node.node.get_our_node_id());
2605                 }
2606
2607                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2608                 unsafe { PAYMENT_COUNT += 1 };
2609                 let our_payment_hash = {
2610                         let mut sha = Sha256::new();
2611                         sha.input(&our_payment_preimage[..]);
2612                         let mut ret = [0; 32];
2613                         sha.result(&mut ret);
2614                         ret
2615                 };
2616
2617                 let err = origin_node.node.send_payment(route, our_payment_hash).err().unwrap();
2618                 assert_eq!(err.err, "Cannot send value that would put us over our max HTLC value in flight");
2619         }
2620
2621         fn send_payment(origin: &Node, expected_route: &[&Node], recv_value: u64) {
2622                 let our_payment_preimage = route_payment(&origin, expected_route, recv_value).0;
2623                 claim_payment(&origin, expected_route, our_payment_preimage);
2624         }
2625
2626         fn fail_payment(origin_node: &Node, expected_route: &[&Node], our_payment_hash: [u8; 32]) {
2627                 assert!(expected_route.last().unwrap().node.fail_htlc_backwards(&our_payment_hash));
2628                 {
2629                         let mut added_monitors = expected_route.last().unwrap().chan_monitor.added_monitors.lock().unwrap();
2630                         assert_eq!(added_monitors.len(), 1);
2631                         added_monitors.clear();
2632                 }
2633
2634                 let mut next_msgs: Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)> = None;
2635                 macro_rules! update_fail_dance {
2636                         ($node: expr, $prev_node: expr, $last_node: expr) => {
2637                                 {
2638                                         $node.node.handle_update_fail_htlc(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2639                                         let revoke_and_commit = $node.node.handle_commitment_signed(&$prev_node.node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2640
2641                                         {
2642                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2643                                                 assert_eq!(added_monitors.len(), 1);
2644                                                 added_monitors.clear();
2645                                         }
2646                                         assert!($prev_node.node.handle_revoke_and_ack(&$node.node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2647                                         {
2648                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2649                                                 assert_eq!(added_monitors.len(), 1);
2650                                                 added_monitors.clear();
2651                                         }
2652                                         let revoke_and_ack = $prev_node.node.handle_commitment_signed(&$node.node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2653                                         {
2654                                                 let mut added_monitors = $prev_node.chan_monitor.added_monitors.lock().unwrap();
2655                                                 assert_eq!(added_monitors.len(), 1);
2656                                                 added_monitors.clear();
2657                                         }
2658                                         assert!(revoke_and_ack.1.is_none());
2659                                         assert!($node.node.get_and_clear_pending_events().is_empty());
2660                                         assert!($node.node.handle_revoke_and_ack(&$prev_node.node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2661                                         {
2662                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2663                                                 if $last_node {
2664                                                         assert_eq!(added_monitors.len(), 1);
2665                                                 } else {
2666                                                         assert_eq!(added_monitors.len(), 2);
2667                                                         assert!(added_monitors[0].0 != added_monitors[1].0);
2668                                                 }
2669                                                 added_monitors.clear();
2670                                         }
2671                                 }
2672                         }
2673                 }
2674
2675                 let mut expected_next_node = expected_route.last().unwrap().node.get_our_node_id();
2676                 let mut prev_node = expected_route.last().unwrap();
2677                 for node in expected_route.iter().rev() {
2678                         assert_eq!(expected_next_node, node.node.get_our_node_id());
2679                         if next_msgs.is_some() {
2680                                 update_fail_dance!(node, prev_node, false);
2681                         }
2682
2683                         let events = node.node.get_and_clear_pending_events();
2684                         assert_eq!(events.len(), 1);
2685                         match events[0] {
2686                                 Event::SendFailHTLC { ref node_id, ref msg, ref commitment_msg } => {
2687                                         expected_next_node = node_id.clone();
2688                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2689                                 },
2690                                 _ => panic!("Unexpected event"),
2691                         };
2692
2693                         prev_node = node;
2694                 }
2695
2696                 assert_eq!(expected_next_node, origin_node.node.get_our_node_id());
2697                 update_fail_dance!(origin_node, expected_route.first().unwrap(), true);
2698
2699                 let events = origin_node.node.get_and_clear_pending_events();
2700                 assert_eq!(events.len(), 1);
2701                 match events[0] {
2702                         Event::PaymentFailed { payment_hash } => {
2703                                 assert_eq!(payment_hash, our_payment_hash);
2704                         },
2705                         _ => panic!("Unexpected event"),
2706                 }
2707         }
2708
2709         fn create_network(node_count: usize) -> Vec<Node> {
2710                 let mut nodes = Vec::new();
2711                 let mut rng = thread_rng();
2712                 let secp_ctx = Secp256k1::new();
2713                 let logger: Arc<Logger> = Arc::new(test_utils::TestLogger::new());
2714
2715                 for _ in 0..node_count {
2716                         let feeest = Arc::new(test_utils::TestFeeEstimator { sat_per_kw: 253 });
2717                         let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new(Arc::clone(&logger)));
2718                         let tx_broadcaster = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2719                         let chan_monitor = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor.clone(), tx_broadcaster.clone()));
2720                         let node_id = {
2721                                 let mut key_slice = [0; 32];
2722                                 rng.fill_bytes(&mut key_slice);
2723                                 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2724                         };
2725                         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();
2726                         let router = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id).unwrap(), Arc::clone(&logger));
2727                         nodes.push(Node { feeest, chain_monitor, tx_broadcaster, chan_monitor, node_id, node, router });
2728                 }
2729
2730                 nodes
2731         }
2732
2733         #[test]
2734         fn fake_network_test() {
2735                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2736                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
2737                 let nodes = create_network(4);
2738
2739                 // Create some initial channels
2740                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2741                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2742                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2743
2744                 // Rebalance the network a bit by relaying one payment through all the channels...
2745                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2746                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2747                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2748                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 8000000);
2749
2750                 // Send some more payments
2751                 send_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 1000000);
2752                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1], &nodes[0])[..], 1000000);
2753                 send_payment(&nodes[3], &vec!(&nodes[2], &nodes[1])[..], 1000000);
2754
2755                 // Test failure packets
2756                 let payment_hash_1 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], 1000000).1;
2757                 fail_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3])[..], payment_hash_1);
2758
2759                 // Add a new channel that skips 3
2760                 let chan_4 = create_announced_chan_between_nodes(&nodes, 1, 3);
2761
2762                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 1000000);
2763                 send_payment(&nodes[2], &vec!(&nodes[3])[..], 1000000);
2764                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2765                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2766                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2767                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2768                 send_payment(&nodes[1], &vec!(&nodes[3])[..], 8000000);
2769
2770                 // Do some rebalance loop payments, simultaneously
2771                 let mut hops = Vec::with_capacity(3);
2772                 hops.push(RouteHop {
2773                         pubkey: nodes[2].node.get_our_node_id(),
2774                         short_channel_id: chan_2.0.contents.short_channel_id,
2775                         fee_msat: 0,
2776                         cltv_expiry_delta: chan_3.0.contents.cltv_expiry_delta as u32
2777                 });
2778                 hops.push(RouteHop {
2779                         pubkey: nodes[3].node.get_our_node_id(),
2780                         short_channel_id: chan_3.0.contents.short_channel_id,
2781                         fee_msat: 0,
2782                         cltv_expiry_delta: chan_4.1.contents.cltv_expiry_delta as u32
2783                 });
2784                 hops.push(RouteHop {
2785                         pubkey: nodes[1].node.get_our_node_id(),
2786                         short_channel_id: chan_4.0.contents.short_channel_id,
2787                         fee_msat: 1000000,
2788                         cltv_expiry_delta: TEST_FINAL_CLTV,
2789                 });
2790                 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;
2791                 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;
2792                 let payment_preimage_1 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[2], &nodes[3], &nodes[1])[..], 1000000).0;
2793
2794                 let mut hops = Vec::with_capacity(3);
2795                 hops.push(RouteHop {
2796                         pubkey: nodes[3].node.get_our_node_id(),
2797                         short_channel_id: chan_4.0.contents.short_channel_id,
2798                         fee_msat: 0,
2799                         cltv_expiry_delta: chan_3.1.contents.cltv_expiry_delta as u32
2800                 });
2801                 hops.push(RouteHop {
2802                         pubkey: nodes[2].node.get_our_node_id(),
2803                         short_channel_id: chan_3.0.contents.short_channel_id,
2804                         fee_msat: 0,
2805                         cltv_expiry_delta: chan_2.1.contents.cltv_expiry_delta as u32
2806                 });
2807                 hops.push(RouteHop {
2808                         pubkey: nodes[1].node.get_our_node_id(),
2809                         short_channel_id: chan_2.0.contents.short_channel_id,
2810                         fee_msat: 1000000,
2811                         cltv_expiry_delta: TEST_FINAL_CLTV,
2812                 });
2813                 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;
2814                 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;
2815                 let payment_hash_2 = send_along_route(&nodes[1], Route { hops }, &vec!(&nodes[3], &nodes[2], &nodes[1])[..], 1000000).1;
2816
2817                 // Claim the rebalances...
2818                 fail_payment(&nodes[1], &vec!(&nodes[3], &nodes[2], &nodes[1])[..], payment_hash_2);
2819                 claim_payment(&nodes[1], &vec!(&nodes[2], &nodes[3], &nodes[1])[..], payment_preimage_1);
2820
2821                 // Add a duplicate new channel from 2 to 4
2822                 let chan_5 = create_announced_chan_between_nodes(&nodes, 1, 3);
2823
2824                 // Send some payments across both channels
2825                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2826                 let payment_preimage_4 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2827                 let payment_preimage_5 = route_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000).0;
2828
2829                 route_over_limit(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], 3000000);
2830
2831                 //TODO: Test that routes work again here as we've been notified that the channel is full
2832
2833                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_3);
2834                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_4);
2835                 claim_payment(&nodes[0], &vec!(&nodes[1], &nodes[3])[..], payment_preimage_5);
2836
2837                 // Close down the channels...
2838                 close_channel(&nodes[0], &nodes[1], &chan_1.2, chan_1.3, true);
2839                 close_channel(&nodes[1], &nodes[2], &chan_2.2, chan_2.3, false);
2840                 close_channel(&nodes[2], &nodes[3], &chan_3.2, chan_3.3, true);
2841                 close_channel(&nodes[1], &nodes[3], &chan_4.2, chan_4.3, false);
2842                 close_channel(&nodes[1], &nodes[3], &chan_5.2, chan_5.3, false);
2843
2844                 // Check that we processed all pending events
2845                 for node in nodes {
2846                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
2847                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
2848                 }
2849         }
2850
2851         #[derive(PartialEq)]
2852         enum HTLCType { NONE, TIMEOUT, SUCCESS }
2853         fn test_txn_broadcast(node: &Node, chan: &(msgs::ChannelUpdate, msgs::ChannelUpdate, [u8; 32], Transaction), commitment_tx: Option<Transaction>, has_htlc_tx: HTLCType) -> Vec<Transaction> {
2854                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2855                 assert!(node_txn.len() >= if commitment_tx.is_some() { 0 } else { 1 } + if has_htlc_tx == HTLCType::NONE { 0 } else { 1 });
2856
2857                 let mut res = Vec::with_capacity(2);
2858
2859                 if let Some(explicit_tx) = commitment_tx {
2860                         res.push(explicit_tx.clone());
2861                 } else {
2862                         for tx in node_txn.iter() {
2863                                 if tx.input.len() == 1 && tx.input[0].prev_hash == chan.3.txid() {
2864                                         let mut funding_tx_map = HashMap::new();
2865                                         funding_tx_map.insert(chan.3.txid(), chan.3.clone());
2866                                         tx.verify(&funding_tx_map).unwrap();
2867                                         res.push(tx.clone());
2868                                 }
2869                         }
2870                 }
2871                 assert_eq!(res.len(), 1);
2872
2873                 if has_htlc_tx != HTLCType::NONE {
2874                         for tx in node_txn.iter() {
2875                                 if tx.input.len() == 1 && tx.input[0].prev_hash == res[0].txid() {
2876                                         let mut funding_tx_map = HashMap::new();
2877                                         funding_tx_map.insert(res[0].txid(), res[0].clone());
2878                                         tx.verify(&funding_tx_map).unwrap();
2879                                         if has_htlc_tx == HTLCType::TIMEOUT {
2880                                                 assert!(tx.lock_time != 0);
2881                                         } else {
2882                                                 assert!(tx.lock_time == 0);
2883                                         }
2884                                         res.push(tx.clone());
2885                                         break;
2886                                 }
2887                         }
2888                         assert_eq!(res.len(), 2);
2889                 }
2890                 node_txn.clear();
2891                 res
2892         }
2893
2894         fn check_preimage_claim(node: &Node, prev_txn: &Vec<Transaction>) -> Vec<Transaction> {
2895                 let mut node_txn = node.tx_broadcaster.txn_broadcasted.lock().unwrap();
2896
2897                 assert!(node_txn.len() >= 1);
2898                 assert_eq!(node_txn[0].input.len(), 1);
2899                 let mut found_prev = false;
2900
2901                 for tx in prev_txn {
2902                         if node_txn[0].input[0].prev_hash == tx.txid() {
2903                                 let mut funding_tx_map = HashMap::new();
2904                                 funding_tx_map.insert(tx.txid(), tx.clone());
2905                                 node_txn[0].verify(&funding_tx_map).unwrap();
2906
2907                                 assert!(node_txn[0].input[0].witness[2].len() > 106); // must spend an htlc output
2908                                 assert_eq!(tx.input.len(), 1); // must spend a commitment tx
2909
2910                                 found_prev = true;
2911                                 break;
2912                         }
2913                 }
2914                 assert!(found_prev);
2915
2916                 let mut res = Vec::new();
2917                 mem::swap(&mut *node_txn, &mut res);
2918                 res
2919         }
2920
2921         fn get_announce_close_broadcast_events(nodes: &Vec<Node>, a: usize, b: usize) {
2922                 let events_1 = nodes[a].node.get_and_clear_pending_events();
2923                 assert_eq!(events_1.len(), 1);
2924                 let as_update = match events_1[0] {
2925                         Event::BroadcastChannelUpdate { ref msg } => {
2926                                 msg.clone()
2927                         },
2928                         _ => panic!("Unexpected event"),
2929                 };
2930
2931                 let events_2 = nodes[b].node.get_and_clear_pending_events();
2932                 assert_eq!(events_2.len(), 1);
2933                 let bs_update = match events_2[0] {
2934                         Event::BroadcastChannelUpdate { ref msg } => {
2935                                 msg.clone()
2936                         },
2937                         _ => panic!("Unexpected event"),
2938                 };
2939
2940                 for node in nodes {
2941                         node.router.handle_channel_update(&as_update).unwrap();
2942                         node.router.handle_channel_update(&bs_update).unwrap();
2943                 }
2944         }
2945
2946         #[test]
2947         fn channel_monitor_network_test() {
2948                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2949                 // tests that ChannelMonitor is able to recover from various states.
2950                 let nodes = create_network(5);
2951
2952                 // Create some initial channels
2953                 let chan_1 = create_announced_chan_between_nodes(&nodes, 0, 1);
2954                 let chan_2 = create_announced_chan_between_nodes(&nodes, 1, 2);
2955                 let chan_3 = create_announced_chan_between_nodes(&nodes, 2, 3);
2956                 let chan_4 = create_announced_chan_between_nodes(&nodes, 3, 4);
2957
2958                 // Rebalance the network a bit by relaying one payment through all the channels...
2959                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2960                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2961                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2962                 send_payment(&nodes[0], &vec!(&nodes[1], &nodes[2], &nodes[3], &nodes[4])[..], 8000000);
2963
2964                 // Simple case with no pending HTLCs:
2965                 nodes[1].node.peer_disconnected(&nodes[0].node.get_our_node_id(), true);
2966                 {
2967                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_1, None, HTLCType::NONE);
2968                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2969                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
2970                         test_txn_broadcast(&nodes[0], &chan_1, None, HTLCType::NONE);
2971                 }
2972                 get_announce_close_broadcast_events(&nodes, 0, 1);
2973                 assert_eq!(nodes[0].node.list_channels().len(), 0);
2974                 assert_eq!(nodes[1].node.list_channels().len(), 1);
2975
2976                 // One pending HTLC is discarded by the force-close:
2977                 let payment_preimage_1 = route_payment(&nodes[1], &vec!(&nodes[2], &nodes[3])[..], 3000000).0;
2978
2979                 // Simple case of one pending HTLC to HTLC-Timeout
2980                 nodes[1].node.peer_disconnected(&nodes[2].node.get_our_node_id(), true);
2981                 {
2982                         let mut node_txn = test_txn_broadcast(&nodes[1], &chan_2, None, HTLCType::TIMEOUT);
2983                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
2984                         nodes[2].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn.drain(..).next().unwrap()] }, 1);
2985                         test_txn_broadcast(&nodes[2], &chan_2, None, HTLCType::NONE);
2986                 }
2987                 get_announce_close_broadcast_events(&nodes, 1, 2);
2988                 assert_eq!(nodes[1].node.list_channels().len(), 0);
2989                 assert_eq!(nodes[2].node.list_channels().len(), 1);
2990
2991                 macro_rules! claim_funds {
2992                         ($node: expr, $prev_node: expr, $preimage: expr) => {
2993                                 {
2994                                         assert!($node.node.claim_funds($preimage));
2995                                         {
2996                                                 let mut added_monitors = $node.chan_monitor.added_monitors.lock().unwrap();
2997                                                 assert_eq!(added_monitors.len(), 1);
2998                                                 added_monitors.clear();
2999                                         }
3000
3001                                         let events = $node.node.get_and_clear_pending_events();
3002                                         assert_eq!(events.len(), 1);
3003                                         match events[0] {
3004                                                 Event::SendFulfillHTLC { ref node_id, .. } => {
3005                                                         assert_eq!(*node_id, $prev_node.node.get_our_node_id());
3006                                                 },
3007                                                 _ => panic!("Unexpected event"),
3008                                         };
3009                                 }
3010                         }
3011                 }
3012
3013                 // nodes[3] gets the preimage, but nodes[2] already disconnected, resulting in a nodes[2]
3014                 // HTLC-Timeout and a nodes[3] claim against it (+ its own announces)
3015                 nodes[2].node.peer_disconnected(&nodes[3].node.get_our_node_id(), true);
3016                 {
3017                         let node_txn = test_txn_broadcast(&nodes[2], &chan_3, None, HTLCType::TIMEOUT);
3018
3019                         // Claim the payment on nodes[3], giving it knowledge of the preimage
3020                         claim_funds!(nodes[3], nodes[2], payment_preimage_1);
3021
3022                         let header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3023                         nodes[3].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, 1);
3024
3025                         check_preimage_claim(&nodes[3], &node_txn);
3026                 }
3027                 get_announce_close_broadcast_events(&nodes, 2, 3);
3028                 assert_eq!(nodes[2].node.list_channels().len(), 0);
3029                 assert_eq!(nodes[3].node.list_channels().len(), 1);
3030
3031                 // One pending HTLC to time out:
3032                 let payment_preimage_2 = route_payment(&nodes[3], &vec!(&nodes[4])[..], 3000000).0;
3033
3034                 {
3035                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3036                         nodes[3].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
3037                         for i in 2..TEST_FINAL_CLTV - 3 {
3038                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3039                                 nodes[3].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
3040                         }
3041
3042                         let node_txn = test_txn_broadcast(&nodes[3], &chan_4, None, HTLCType::TIMEOUT);
3043
3044                         // Claim the payment on nodes[3], giving it knowledge of the preimage
3045                         claim_funds!(nodes[4], nodes[3], payment_preimage_2);
3046
3047                         header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3048                         nodes[4].chain_monitor.block_connected_checked(&header, 1, &Vec::new()[..], &[0; 0]);
3049                         for i in 2..TEST_FINAL_CLTV - 3 {
3050                                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3051                                 nodes[4].chain_monitor.block_connected_checked(&header, i, &Vec::new()[..], &[0; 0]);
3052                         }
3053
3054                         test_txn_broadcast(&nodes[4], &chan_4, None, HTLCType::SUCCESS);
3055
3056                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3057                         nodes[4].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[0].clone()] }, TEST_FINAL_CLTV - 5);
3058
3059                         check_preimage_claim(&nodes[4], &node_txn);
3060                 }
3061                 get_announce_close_broadcast_events(&nodes, 3, 4);
3062                 assert_eq!(nodes[3].node.list_channels().len(), 0);
3063                 assert_eq!(nodes[4].node.list_channels().len(), 0);
3064
3065                 // Create some new channels:
3066                 let chan_5 = create_announced_chan_between_nodes(&nodes, 0, 1);
3067
3068                 // A pending HTLC which will be revoked:
3069                 let payment_preimage_3 = route_payment(&nodes[0], &vec!(&nodes[1])[..], 3000000).0;
3070                 // Get the will-be-revoked local txn from nodes[0]
3071                 let revoked_local_txn = nodes[0].node.channel_state.lock().unwrap().by_id.iter().next().unwrap().1.last_local_commitment_txn.clone();
3072                 // Revoke the old state
3073                 claim_payment(&nodes[0], &vec!(&nodes[1])[..], payment_preimage_3);
3074
3075                 {
3076                         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3077                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
3078                         {
3079                                 let mut node_txn = nodes[1].tx_broadcaster.txn_broadcasted.lock().unwrap();
3080                                 assert_eq!(node_txn.len(), 2);
3081                                 assert_eq!(node_txn[0].input.len(), 1);
3082
3083                                 let mut funding_tx_map = HashMap::new();
3084                                 funding_tx_map.insert(revoked_local_txn[0].txid(), revoked_local_txn[0].clone());
3085                                 node_txn[0].verify(&funding_tx_map).unwrap();
3086                                 node_txn.swap_remove(0);
3087                         }
3088                         test_txn_broadcast(&nodes[1], &chan_5, None, HTLCType::NONE);
3089
3090                         nodes[0].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![revoked_local_txn[0].clone()] }, 1);
3091                         let node_txn = test_txn_broadcast(&nodes[0], &chan_5, Some(revoked_local_txn[0].clone()), HTLCType::TIMEOUT);
3092                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3093                         nodes[1].chain_monitor.block_connected_with_filtering(&Block { header, txdata: vec![node_txn[1].clone()] }, 1);
3094
3095                         //TODO: At this point nodes[1] should claim the revoked HTLC-Timeout output, but that's
3096                         //not yet implemented in ChannelMonitor
3097                 }
3098                 get_announce_close_broadcast_events(&nodes, 0, 1);
3099                 assert_eq!(nodes[0].node.list_channels().len(), 0);
3100                 assert_eq!(nodes[1].node.list_channels().len(), 0);
3101
3102                 // Check that we processed all pending events
3103                 for node in nodes {
3104                         assert_eq!(node.node.get_and_clear_pending_events().len(), 0);
3105                         assert_eq!(node.chan_monitor.added_monitors.lock().unwrap().len(), 0);
3106                 }
3107         }
3108
3109         #[test]
3110         fn test_unconf_chan() {
3111                 // After creating a chan between nodes, we disconnect all blocks previously seen to force a channel close on nodes[0] side
3112                 let nodes = create_network(2);
3113                 create_announced_chan_between_nodes(&nodes, 0, 1);
3114
3115                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
3116                 assert_eq!(channel_state.by_id.len(), 1);
3117                 assert_eq!(channel_state.short_to_id.len(), 1);
3118                 mem::drop(channel_state);
3119
3120                 let mut headers = Vec::new();
3121                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3122                 headers.push(header.clone());
3123                 for _i in 2..100 {
3124                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
3125                         headers.push(header.clone());
3126                 }
3127                 while !headers.is_empty() {
3128                         nodes[0].node.block_disconnected(&headers.pop().unwrap());
3129                 }
3130                 let channel_state = nodes[0].node.channel_state.lock().unwrap();
3131                 assert_eq!(channel_state.by_id.len(), 0);
3132                 assert_eq!(channel_state.short_to_id.len(), 0);
3133         }
3134 }