_ 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 use bitcoin::util::uint::Uint256;
   8
   9 use secp256k1::key::{SecretKey,PublicKey};
  10 use secp256k1::{Secp256k1,Message};
  11 use secp256k1::ecdh::SharedSecret;
  12 use secp256k1;
  13
  14 use chain::chaininterface::{BroadcasterInterface,ChainListener,ChainWatchInterface,FeeEstimator};
  15 use ln::channel::Channel;
  16 use ln::channelmonitor::ManyChannelMonitor;
  17 use ln::router::Route;
  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
  23 use crypto::mac::{Mac,MacResult};
  24 use crypto::hmac::Hmac;
  25 use crypto::digest::Digest;
  26 use crypto::symmetriccipher::SynchronousStreamCipher;
  27 use crypto::chacha20::ChaCha20;
  28
  29 use std::sync::{Mutex,MutexGuard,Arc};
  30 use std::collections::HashMap;
  31 use std::collections::hash_map;
  32 use std::{ptr, mem};
  33 use std::time::{Instant,Duration};
  34
  35 mod channel_held_info {
  36         use ln::msgs;
  37
  38         /// Stores the info we will need to send when we want to forward an HTLC onwards
  39         pub struct PendingForwardHTLCInfo {
  40                 pub(super) onion_packet: Option<msgs::OnionPacket>,
  41                 pub(super) payment_hash: [u8; 32],
  42                 pub(super) short_channel_id: u64,
  43                 pub(super) prev_short_channel_id: u64,
  44                 pub(super) amt_to_forward: u64,
  45                 pub(super) outgoing_cltv_value: u32,
  46         }
  47
  48         #[cfg(feature = "fuzztarget")]
  49         impl PendingForwardHTLCInfo {
  50                 pub fn dummy() -> Self {
  51                         Self {
  52                                 onion_packet: None,
  53                                 payment_hash: [0; 32],
  54                                 short_channel_id: 0,
  55                                 prev_short_channel_id: 0,
  56                                 amt_to_forward: 0,
  57                                 outgoing_cltv_value: 0,
  58                         }
  59                 }
  60         }
  61
  62         #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
  63         pub enum HTLCFailReason {
  64                 ErrorPacket {
  65                         err: msgs::OnionErrorPacket,
  66                 },
  67                 Reason {
  68                         failure_code: u16,
  69                         data: Vec<u8>,
  70                 }
  71         }
  72
  73         #[cfg(feature = "fuzztarget")]
  74         impl HTLCFailReason {
  75                 pub fn dummy() -> Self {
  76                         HTLCFailReason::Reason {
  77                                 failure_code: 0, data: Vec::new(),
  78                         }
  79                 }
  80         }
  81 }
  82 #[cfg(feature = "fuzztarget")]
  83 pub use self::channel_held_info::*;
  84 #[cfg(not(feature = "fuzztarget"))]
  85 pub(crate) use self::channel_held_info::*;
  86
  87 enum PendingOutboundHTLC {
  88         IntermediaryHopData {
  89                 source_short_channel_id: u64,
  90                 incoming_packet_shared_secret: SharedSecret,
  91         },
  92         OutboundRoute {
  93                 route: Route,
  94         },
  95         /// Used for channel rebalancing
  96         CycledRoute {
  97                 source_short_channel_id: u64,
  98                 incoming_packet_shared_secret: SharedSecret,
  99                 route: Route,
 100         }
 101 }
 102
 103 /// We hold back HTLCs we intend to relay for a random interval in the range (this, 5*this). This
 104 /// provides some limited amount of privacy. Ideally this would range from somewhere like 1 second
 105 /// to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly. We could
 106 /// probably increase this significantly.
 107 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u32 = 50;
 108
 109 struct ChannelHolder {
 110         by_id: HashMap<Uint256, Channel>,
 111         short_to_id: HashMap<u64, Uint256>,
 112         next_forward: Instant,
 113         /// short channel id -> forward infos. Key of 0 means payments received
 114         forward_htlcs: HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 115         claimable_htlcs: HashMap<[u8; 32], PendingOutboundHTLC>,
 116 }
 117 struct MutChannelHolder<'a> {
 118         by_id: &'a mut HashMap<Uint256, Channel>,
 119         short_to_id: &'a mut HashMap<u64, Uint256>,
 120         next_forward: &'a mut Instant,
 121         /// short channel id -> forward infos. Key of 0 means payments received
 122         forward_htlcs: &'a mut HashMap<u64, Vec<PendingForwardHTLCInfo>>,
 123         claimable_htlcs: &'a mut HashMap<[u8; 32], PendingOutboundHTLC>,
 124 }
 125 impl ChannelHolder {
 126         fn borrow_parts(&mut self) -> MutChannelHolder {
 127                 MutChannelHolder {
 128                         by_id: &mut self.by_id,
 129                         short_to_id: &mut self.short_to_id,
 130                         next_forward: &mut self.next_forward,
 131                         /// short channel id -> forward infos. Key of 0 means payments received
 132                         forward_htlcs: &mut self.forward_htlcs,
 133                         claimable_htlcs: &mut self.claimable_htlcs,
 134                 }
 135         }
 136 }
 137
 138 /// Manager which keeps track of a number of channels and sends messages to the appropriate
 139 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
 140 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
 141 /// to individual Channels.
 142 pub struct ChannelManager {
 143         genesis_hash: Sha256dHash,
 144         fee_estimator: Arc<FeeEstimator>,
 145         monitor: Arc<ManyChannelMonitor>,
 146         chain_monitor: Arc<ChainWatchInterface>,
 147         tx_broadcaster: Arc<BroadcasterInterface>,
 148
 149         announce_channels_publicly: bool,
 150         fee_proportional_millionths: u32,
 151         secp_ctx: Secp256k1,
 152
 153         channel_state: Mutex<ChannelHolder>,
 154         our_network_key: SecretKey,
 155
 156         pending_events: Mutex<Vec<events::Event>>,
 157 }
 158
 159 const CLTV_EXPIRY_DELTA: u16 = 6 * 24 * 2; //TODO?
 160
 161 macro_rules! secp_call {
 162         ( $res : expr ) => {
 163                 match $res {
 164                         Ok(key) => key,
 165                         //TODO: Make the err a parameter!
 166                         Err(_) => return Err(HandleError{err: "Key error", msg: None})
 167                 }
 168         };
 169 }
 170
 171 struct OnionKeys {
 172         #[cfg(test)]
 173         shared_secret: SharedSecret,
 174         #[cfg(test)]
 175         blinding_factor: [u8; 32],
 176         ephemeral_pubkey: PublicKey,
 177         rho: [u8; 32],
 178         mu: [u8; 32],
 179 }
 180
 181 pub struct ChannelDetails {
 182         /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
 183         /// thereafter this is the txid of the funding transaction xor the funding transaction output).
 184         /// Note that this means this value is *not* persistent - it can change once during the
 185         /// lifetime of the channel.
 186         pub channel_id: Uint256,
 187         /// The position of the funding transaction in the chain. None if the funding transaction has
 188         /// not yet been confirmed and the channel fully opened.
 189         pub short_channel_id: Option<u64>,
 190         pub remote_network_id: PublicKey,
 191         pub channel_value_satoshis: u64,
 192         /// The user_id passed in to create_channel, or 0 if the channel was inbound.
 193         pub user_id: u64,
 194 }
 195
 196 impl ChannelManager {
 197         /// Constructs a new ChannelManager to hold several channels and route between them. This is
 198         /// the main "logic hub" for all channel-related actions, and implements ChannelMessageHandler.
 199         /// fee_proportional_millionths is an optional fee to charge any payments routed through us.
 200         /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
 201         /// panics if channel_value_satoshis is >= (1 << 24)!
 202         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>) -> Result<Arc<ChannelManager>, secp256k1::Error> {
 203                 let secp_ctx = Secp256k1::new();
 204
 205                 let res = Arc::new(ChannelManager {
 206                         genesis_hash: genesis_block(network).header.bitcoin_hash(),
 207                         fee_estimator: feeest.clone(),
 208                         monitor: monitor.clone(),
 209                         chain_monitor,
 210                         tx_broadcaster,
 211
 212                         announce_channels_publicly,
 213                         fee_proportional_millionths,
 214                         secp_ctx,
 215
 216                         channel_state: Mutex::new(ChannelHolder{
 217                                 by_id: HashMap::new(),
 218                                 short_to_id: HashMap::new(),
 219                                 next_forward: Instant::now(),
 220                                 forward_htlcs: HashMap::new(),
 221                                 claimable_htlcs: HashMap::new(),
 222                         }),
 223                         our_network_key,
 224
 225                         pending_events: Mutex::new(Vec::new()),
 226                 });
 227                 let weak_res = Arc::downgrade(&res);
 228                 res.chain_monitor.register_listener(weak_res);
 229                 Ok(res)
 230         }
 231
 232         pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, user_id: u64) -> Result<msgs::OpenChannel, HandleError> {
 233                 let channel = Channel::new_outbound(&*self.fee_estimator, their_network_key, channel_value_satoshis, self.announce_channels_publicly, user_id);
 234                 let res = channel.get_open_channel(self.genesis_hash.clone(), &*self.fee_estimator)?;
 235                 let mut channel_state = self.channel_state.lock().unwrap();
 236                 match channel_state.by_id.insert(channel.channel_id(), channel) {
 237                         Some(_) => panic!("RNG is bad???"),
 238                         None => Ok(res)
 239                 }
 240         }
 241
 242         /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
 243         /// more information.
 244         pub fn list_channels(&self) -> Vec<ChannelDetails> {
 245                 let channel_state = self.channel_state.lock().unwrap();
 246                 let mut res = Vec::with_capacity(channel_state.by_id.len());
 247                 for (channel_id, channel) in channel_state.by_id.iter() {
 248                         res.push(ChannelDetails {
 249                                 channel_id: (*channel_id).clone(),
 250                                 short_channel_id: channel.get_short_channel_id(),
 251                                 remote_network_id: channel.get_their_node_id(),
 252                                 channel_value_satoshis: channel.get_value_satoshis(),
 253                                 user_id: channel.get_user_id(),
 254                         });
 255                 }
 256                 res
 257         }
 258
 259         /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
 260         /// will be accepted on the given channel, and after additional timeout/the closing of all
 261         /// pending HTLCs, the channel will be closed on chain.
 262         pub fn close_channel(&self, channel_id: &Uint256) -> Result<msgs::Shutdown, HandleError> {
 263                 let res = {
 264                         let mut channel_state = self.channel_state.lock().unwrap();
 265                         match channel_state.by_id.entry(channel_id.clone()) {
 266                                 hash_map::Entry::Occupied(mut chan_entry) => {
 267                                         let res = chan_entry.get_mut().get_shutdown()?;
 268                                         if chan_entry.get().is_shutdown() {
 269                                                 chan_entry.remove_entry();
 270                                         }
 271                                         res
 272                                 },
 273                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "No such channel", msg: None})
 274                         }
 275                 };
 276                 for payment_hash in res.1 {
 277                         // unknown_next_peer...I dunno who that is anymore....
 278                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
 279                 }
 280                 Ok(res.0)
 281         }
 282
 283         #[inline]
 284         fn gen_rho_mu_from_shared_secret(shared_secret: &SharedSecret) -> ([u8; 32], [u8; 32]) {
 285                 ({
 286                         let mut hmac = Hmac::new(Sha256::new(), &[0x72, 0x68, 0x6f]); // rho
 287                         hmac.input(&shared_secret[..]);
 288                         let mut res = [0; 32];
 289                         hmac.raw_result(&mut res);
 290                         res
 291                 },
 292                 {
 293                         let mut hmac = Hmac::new(Sha256::new(), &[0x6d, 0x75]); // mu
 294                         hmac.input(&shared_secret[..]);
 295                         let mut res = [0; 32];
 296                         hmac.raw_result(&mut res);
 297                         res
 298                 })
 299         }
 300
 301         #[inline]
 302         fn gen_um_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 303                 let mut hmac = Hmac::new(Sha256::new(), &[0x75, 0x6d]); // um
 304                 hmac.input(&shared_secret[..]);
 305                 let mut res = [0; 32];
 306                 hmac.raw_result(&mut res);
 307                 res
 308         }
 309
 310         fn gen_ammag_from_shared_secret(shared_secret: &SharedSecret) -> [u8; 32] {
 311                 let mut hmac = Hmac::new(Sha256::new(), &[0x61, 0x6d, 0x6d, 0x61, 0x67]); // ammag
 312                 hmac.input(&shared_secret[..]);
 313                 let mut res = [0; 32];
 314                 hmac.raw_result(&mut res);
 315                 res
 316         }
 317
 318         fn construct_onion_keys(secp_ctx: &Secp256k1, route: &Route, session_priv: &SecretKey) -> Result<Vec<OnionKeys>, HandleError> {
 319                 let mut res = Vec::with_capacity(route.hops.len());
 320                 let mut blinded_priv = session_priv.clone();
 321                 let mut blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 322                 let mut first_iteration = true;
 323
 324                 for hop in route.hops.iter() {
 325                         let shared_secret = SharedSecret::new(secp_ctx, &hop.pubkey, &blinded_priv);
 326
 327                         let mut sha = Sha256::new();
 328                         sha.input(&blinded_pub.serialize()[..]);
 329                         sha.input(&shared_secret[..]);
 330                         let mut blinding_factor = [0u8; 32];
 331                         sha.result(&mut blinding_factor);
 332
 333                         if first_iteration {
 334                                 blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 335                                 first_iteration = false;
 336                         }
 337                         let ephemeral_pubkey = blinded_pub;
 338
 339                         secp_call!(blinded_priv.mul_assign(secp_ctx, &secp_call!(SecretKey::from_slice(secp_ctx, &blinding_factor))));
 340                         blinded_pub = secp_call!(PublicKey::from_secret_key(secp_ctx, &blinded_priv));
 341
 342                         let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
 343
 344                         res.push(OnionKeys {
 345                                 #[cfg(test)]
 346                                 shared_secret: shared_secret,
 347                                 #[cfg(test)]
 348                                 blinding_factor: blinding_factor,
 349                                 ephemeral_pubkey: ephemeral_pubkey,
 350                                 rho: rho,
 351                                 mu: mu,
 352                         });
 353                 }
 354
 355                 Ok(res)
 356         }
 357
 358         /// returns the hop data, as well as the first-hop value_msat and CLTV value we should send.
 359         fn build_onion_payloads(route: &Route) -> Result<(Vec<msgs::OnionHopData>, u64, u32), HandleError> {
 360                 let mut cur_value_msat = 0u64;
 361                 let mut cur_cltv = 0u32;
 362                 let mut last_short_channel_id = 0;
 363                 let mut res: Vec<msgs::OnionHopData> = Vec::with_capacity(route.hops.len());
 364                 internal_traits::test_no_dealloc::<msgs::OnionHopData>(None);
 365                 unsafe { res.set_len(route.hops.len()); }
 366
 367                 for (idx, hop) in route.hops.iter().enumerate().rev() {
 368                         // First hop gets special values so that it can check, on receipt, that everything is
 369                         // exactly as it should be (and the next hop isn't trying to probe to find out if we're
 370                         // the intended recipient).
 371                         let value_msat = if cur_value_msat == 0 { hop.fee_msat } else { cur_value_msat };
 372                         let cltv = if cur_cltv == 0 { hop.cltv_expiry_delta } else { cur_cltv };
 373                         res[idx] = msgs::OnionHopData {
 374                                 realm: 0,
 375                                 data: msgs::OnionRealm0HopData {
 376                                         short_channel_id: last_short_channel_id,
 377                                         amt_to_forward: value_msat,
 378                                         outgoing_cltv_value: cltv,
 379                                 },
 380                                 hmac: [0; 32],
 381                         };
 382                         cur_value_msat += hop.fee_msat;
 383                         if cur_value_msat >= 21000000 * 100000000 * 1000 {
 384                                 return Err(HandleError{err: "Channel fees overflowed?!", msg: None});
 385                         }
 386                         cur_cltv += hop.cltv_expiry_delta as u32;
 387                         if cur_cltv >= 500000000 {
 388                                 return Err(HandleError{err: "Channel CLTV overflowed?!", msg: None});
 389                         }
 390                         last_short_channel_id = hop.short_channel_id;
 391                 }
 392                 Ok((res, cur_value_msat, cur_cltv))
 393         }
 394
 395         #[inline]
 396         fn shift_arr_right(arr: &mut [u8; 20*65]) {
 397                 unsafe {
 398                         ptr::copy(arr[0..].as_ptr(), arr[65..].as_mut_ptr(), 19*65);
 399                 }
 400                 for i in 0..65 {
 401                         arr[i] = 0;
 402                 }
 403         }
 404
 405         #[inline]
 406         fn xor_bufs(dst: &mut[u8], src: &[u8]) {
 407                 assert_eq!(dst.len(), src.len());
 408
 409                 for i in 0..dst.len() {
 410                         dst[i] ^= src[i];
 411                 }
 412         }
 413
 414         const ZERO:[u8; 21*65] = [0; 21*65];
 415         fn construct_onion_packet(mut payloads: Vec<msgs::OnionHopData>, onion_keys: Vec<OnionKeys>, associated_data: Vec<u8>) -> Result<msgs::OnionPacket, HandleError> {
 416                 let mut buf = Vec::with_capacity(21*65);
 417                 buf.resize(21*65, 0);
 418
 419                 let filler = {
 420                         let iters = payloads.len() - 1;
 421                         let end_len = iters * 65;
 422                         let mut res = Vec::with_capacity(end_len);
 423                         res.resize(end_len, 0);
 424
 425                         for (i, keys) in onion_keys.iter().enumerate() {
 426                                 if i == payloads.len() - 1 { continue; }
 427                                 let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 428                                 chacha.process(&ChannelManager::ZERO, &mut buf); // We don't have a seek function :(
 429                                 ChannelManager::xor_bufs(&mut res[0..(i + 1)*65], &buf[(20 - i)*65..21*65]);
 430                         }
 431                         res
 432                 };
 433
 434                 let mut packet_data = [0; 20*65];
 435                 let mut hmac_res = [0; 32];
 436
 437                 for (i, (payload, keys)) in payloads.iter_mut().zip(onion_keys.iter()).rev().enumerate() {
 438                         ChannelManager::shift_arr_right(&mut packet_data);
 439                         payload.hmac = hmac_res;
 440                         packet_data[0..65].copy_from_slice(&payload.encode()[..]);
 441
 442                         let mut chacha = ChaCha20::new(&keys.rho, &[0u8; 8]);
 443                         chacha.process(&packet_data, &mut buf[0..20*65]);
 444                         packet_data[..].copy_from_slice(&buf[0..20*65]);
 445
 446                         if i == 0 {
 447                                 packet_data[20*65 - filler.len()..20*65].copy_from_slice(&filler[..]);
 448                         }
 449
 450                         let mut hmac = Hmac::new(Sha256::new(), &keys.mu);
 451                         hmac.input(&packet_data);
 452                         hmac.input(&associated_data[..]);
 453                         hmac.raw_result(&mut hmac_res);
 454                 }
 455
 456                 Ok(msgs::OnionPacket{
 457                         version: 0,
 458                         public_key: onion_keys.first().unwrap().ephemeral_pubkey,
 459                         hop_data: packet_data,
 460                         hmac: hmac_res,
 461                 })
 462         }
 463
 464         /// Encrypts a failure packet. raw_packet can either be a
 465         /// msgs::DecodedOnionErrorPacket.encode() result or a msgs::OnionErrorPacket.data element.
 466         fn encrypt_failure_packet(shared_secret: &SharedSecret, raw_packet: &[u8]) -> msgs::OnionErrorPacket {
 467                 let ammag = ChannelManager::gen_ammag_from_shared_secret(&shared_secret);
 468
 469                 let mut packet_crypted = Vec::with_capacity(raw_packet.len());
 470                 packet_crypted.resize(raw_packet.len(), 0);
 471                 let mut chacha = ChaCha20::new(&ammag, &[0u8; 8]);
 472                 chacha.process(&raw_packet, &mut packet_crypted[..]);
 473                 msgs::OnionErrorPacket {
 474                         data: packet_crypted,
 475                 }
 476         }
 477
 478         fn build_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::DecodedOnionErrorPacket {
 479                 assert!(failure_data.len() <= 256 - 2);
 480
 481                 let um = ChannelManager::gen_um_from_shared_secret(&shared_secret);
 482
 483                 let failuremsg = {
 484                         let mut res = Vec::with_capacity(2 + failure_data.len());
 485                         res.push(((failure_type >> 8) & 0xff) as u8);
 486                         res.push(((failure_type >> 0) & 0xff) as u8);
 487                         res.extend_from_slice(&failure_data[..]);
 488                         res
 489                 };
 490                 let pad = {
 491                         let mut res = Vec::with_capacity(256 - 2 - failure_data.len());
 492                         res.resize(256 - 2 - failure_data.len(), 0);
 493                         res
 494                 };
 495                 let mut packet = msgs::DecodedOnionErrorPacket {
 496                         hmac: [0; 32],
 497                         failuremsg: failuremsg,
 498                         pad: pad,
 499                 };
 500
 501                 let mut hmac = Hmac::new(Sha256::new(), &um);
 502                 hmac.input(&packet.encode()[32..]);
 503                 hmac.raw_result(&mut packet.hmac);
 504
 505                 packet
 506         }
 507
 508         fn build_first_hop_failure_packet(shared_secret: &SharedSecret, failure_type: u16, failure_data: &[u8]) -> msgs::OnionErrorPacket {
 509                 let failure_packet = ChannelManager::build_failure_packet(shared_secret, failure_type, failure_data);
 510                 ChannelManager::encrypt_failure_packet(shared_secret, &failure_packet.encode()[..])
 511         }
 512
 513         /// only fails if the channel does not yet have an assigned short_id
 514         fn get_channel_update(&self, chan: &mut Channel) -> Result<msgs::ChannelUpdate, HandleError> {
 515                 let short_channel_id = match chan.get_short_channel_id() {
 516                         None => return Err(HandleError{err: "Channel not yet established", msg: None}),
 517                         Some(id) => id,
 518                 };
 519
 520                 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap().serialize()[..] < chan.get_their_node_id().serialize()[..];
 521
 522                 let unsigned = msgs::UnsignedChannelUpdate {
 523                         chain_hash: self.genesis_hash,
 524                         short_channel_id: short_channel_id,
 525                         timestamp: chan.get_channel_update_count(),
 526                         flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
 527                         cltv_expiry_delta: CLTV_EXPIRY_DELTA,
 528                         htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
 529                         fee_base_msat: chan.get_our_fee_base_msat(&*self.fee_estimator),
 530                         fee_proportional_millionths: self.fee_proportional_millionths,
 531                 };
 532
 533                 let msg_hash = Sha256dHash::from_data(&unsigned.encode()[..]);
 534                 let sig = self.secp_ctx.sign(&Message::from_slice(&msg_hash[..]).unwrap(), &self.our_network_key).unwrap(); //TODO Can we unwrap here?
 535
 536                 Ok(msgs::ChannelUpdate {
 537                         signature: sig,
 538                         contents: unsigned
 539                 })
 540         }
 541
 542         /// Sends a payment along a given route, returning the UpdateAddHTLC message to give to the
 543         /// first hop in route. Value parameters are provided via the last hop in route, see
 544         /// documentation for RouteHop fields for more info.
 545         /// See-also docs on Channel::send_htlc_and_commit.
 546         pub fn send_payment(&self, route: Route, payment_hash: [u8; 32]) -> Result<Option<(msgs::UpdateAddHTLC, msgs::CommitmentSigned)>, HandleError> {
 547                 if route.hops.len() < 1 || route.hops.len() > 20 {
 548                         return Err(HandleError{err: "Route didn't go anywhere/had bogus size", msg: None});
 549                 }
 550                 let our_node_id = self.get_our_node_id();
 551                 for (idx, hop) in route.hops.iter().enumerate() {
 552                         if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
 553                                 return Err(HandleError{err: "Route went through us but wasn't a simple rebalance loop to us", msg: None});
 554                         }
 555                 }
 556
 557                 let session_priv = secp_call!(SecretKey::from_slice(&self.secp_ctx, &{
 558                         let mut session_key = [0; 32];
 559                         rng::fill_bytes(&mut session_key);
 560                         session_key
 561                 }));
 562
 563                 let associated_data = Vec::new(); //TODO: What to put here?
 564
 565                 let onion_keys = ChannelManager::construct_onion_keys(&self.secp_ctx, &route, &session_priv)?;
 566                 let (onion_payloads, htlc_msat, htlc_cltv) = ChannelManager::build_onion_payloads(&route)?;
 567                 let onion_packet = ChannelManager::construct_onion_packet(onion_payloads, onion_keys, associated_data)?;
 568
 569                 let mut channel_state = self.channel_state.lock().unwrap();
 570                 let id = match channel_state.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
 571                         None => return Err(HandleError{err: "No channel available with first hop!", msg: None}),
 572                         Some(id) => id.clone()
 573                 };
 574                 let res = {
 575                         let chan = channel_state.by_id.get_mut(&id).unwrap();
 576                         if chan.get_their_node_id() != route.hops.first().unwrap().pubkey {
 577                                 return Err(HandleError{err: "Node ID mismatch on first hop!", msg: None});
 578                         }
 579                         chan.send_htlc_and_commit(htlc_msat, payment_hash.clone(), htlc_cltv, onion_packet)?
 580                 };
 581
 582                 if channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute {
 583                         route: route,
 584                 }).is_some() {
 585                         // TODO: We need to track these better, we're not generating these, so a
 586                         // third-party might make this happen:
 587                         panic!("payment_hash was repeated! Don't let this happen");
 588                 }
 589
 590                 Ok(res)
 591         }
 592
 593         /// Call this upon creation of a funding transaction for the given channel.
 594         /// Panics if a funding transaction has already been provided for this channel.
 595         pub fn funding_transaction_generated(&self, temporary_channel_id: &Uint256, funding_txo: (Sha256dHash, u16)) {
 596                 let (chan, msg) = {
 597                         let mut channel_state = self.channel_state.lock().unwrap();
 598                         match channel_state.by_id.remove(&temporary_channel_id) {
 599                                 Some(mut chan) => {
 600                                         match chan.get_outbound_funding_created(funding_txo.0, funding_txo.1) {
 601                                                 Ok(funding_msg) => {
 602                                                         (chan, funding_msg)
 603                                                 },
 604                                                 Err(_e) => {
 605                                                         //TODO: Push e to pendingevents
 606                                                         return;
 607                                                 }
 608                                         }
 609                                 },
 610                                 None => return
 611                         }
 612                 }; // Release channel lock for install_watch_outpoint call,
 613                 let chan_monitor = chan.channel_monitor();
 614                 match self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
 615                         Ok(()) => {},
 616                         Err(_e) => {
 617                                 //TODO: Push e to pendingevents?
 618                                 return;
 619                         }
 620                 };
 621
 622                 {
 623                         let mut pending_events = self.pending_events.lock().unwrap();
 624                         pending_events.push(events::Event::SendFundingCreated {
 625                                 node_id: chan.get_their_node_id(),
 626                                 msg: msg,
 627                         });
 628                 }
 629
 630                 let mut channel_state = self.channel_state.lock().unwrap();
 631                 channel_state.by_id.insert(chan.channel_id(), chan);
 632         }
 633
 634         fn get_announcement_sigs(&self, chan: &Channel) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
 635                 if !chan.is_usable() { return Ok(None) }
 636
 637                 let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone())?;
 638                 let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
 639                 let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
 640
 641                 Ok(Some(msgs::AnnouncementSignatures {
 642                         channel_id: chan.channel_id(),
 643                         short_channel_id: chan.get_short_channel_id().unwrap(),
 644                         node_signature: our_node_sig,
 645                         bitcoin_signature: our_bitcoin_sig,
 646                 }))
 647         }
 648
 649         pub fn process_pending_htlc_forward(&self) {
 650                 let mut new_events = Vec::new();
 651                 let mut failed_forwards = Vec::new();
 652                 {
 653                         let mut channel_state_lock = self.channel_state.lock().unwrap();
 654                         let channel_state = channel_state_lock.borrow_parts();
 655
 656                         if cfg!(not(feature = "fuzztarget")) && Instant::now() < *channel_state.next_forward {
 657                                 return;
 658                         }
 659
 660                         for (short_chan_id, pending_forwards) in channel_state.forward_htlcs.drain() {
 661                                 if short_chan_id != 0 {
 662                                         let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
 663                                                 Some(chan_id) => chan_id.clone(),
 664                                                 None => {
 665                                                         failed_forwards.reserve(pending_forwards.len());
 666                                                         for forward_info in pending_forwards {
 667                                                                 failed_forwards.push((forward_info.payment_hash, 0x4000 | 10, None));
 668                                                         }
 669                                                         // TODO: Send a failure packet back on each pending_forward
 670                                                         continue;
 671                                                 }
 672                                         };
 673                                         let forward_chan = &mut channel_state.by_id.get_mut(&forward_chan_id).unwrap();
 674
 675                                         let mut add_htlc_msgs = Vec::new();
 676                                         for forward_info in pending_forwards {
 677                                                 match forward_chan.send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, forward_info.onion_packet.unwrap()) {
 678                                                         Err(_e) => {
 679                                                                 let chan_update = self.get_channel_update(forward_chan).unwrap();
 680                                                                 failed_forwards.push((forward_info.payment_hash, 0x4000 | 7, Some(chan_update)));
 681                                                                 continue;
 682                                                         },
 683                                                         Ok(update_add) => {
 684                                                                 match update_add {
 685                                                                         Some(msg) => { add_htlc_msgs.push(msg); },
 686                                                                         None => {
 687                                                                                 // Nothing to do here...we're waiting on a remote
 688                                                                                 // revoke_and_ack before we can add anymore HTLCs. The Channel
 689                                                                                 // will automatically handle building the update_add_htlc and
 690                                                                                 // commitment_signed messages when we can.
 691                                                                                 // TODO: Do some kind of timer to set the channel as !is_live()
 692                                                                                 // as we don't really want others relying on us relaying through
 693                                                                                 // this channel currently :/.
 694                                                                         }
 695                                                                 }
 696                                                         }
 697                                                 }
 698                                         }
 699
 700                                         if !add_htlc_msgs.is_empty() {
 701                                                 let commitment_msg = match forward_chan.send_commitment() {
 702                                                         Ok(msg) => msg,
 703                                                         Err(_) => {
 704                                                                 //TODO: Handle...this is bad!
 705                                                                 continue;
 706                                                         },
 707                                                 };
 708                                                 new_events.push(events::Event::SendHTLCs {
 709                                                         node_id: forward_chan.get_their_node_id(),
 710                                                         msgs: add_htlc_msgs,
 711                                                         commitment_msg: commitment_msg,
 712                                                 });
 713                                         }
 714                                 } else {
 715                                         for forward_info in pending_forwards {
 716                                                 new_events.push(events::Event::PaymentReceived {
 717                                                         payment_hash: forward_info.payment_hash,
 718                                                         amt: forward_info.amt_to_forward,
 719                                                 });
 720                                         }
 721                                 }
 722                         }
 723                 }
 724
 725                 for failed_forward in failed_forwards.drain(..) {
 726                         match failed_forward.2 {
 727                                 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failed_forward.0, HTLCFailReason::Reason { failure_code: failed_forward.1, data: Vec::new() }),
 728                                 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() }),
 729                         };
 730                 }
 731
 732                 if new_events.is_empty() { return }
 733
 734                 let mut events = self.pending_events.lock().unwrap();
 735                 events.reserve(new_events.len());
 736                 for event in new_events.drain(..) {
 737                         events.push(event);
 738                 }
 739         }
 740
 741         /// Indicates that the preimage for payment_hash is unknown after a PaymentReceived event.
 742         pub fn fail_htlc_backwards(&self, payment_hash: &[u8; 32]) -> bool {
 743                 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: Vec::new() })
 744         }
 745
 746         fn fail_htlc_backwards_internal(&self, mut channel_state: MutexGuard<ChannelHolder>, payment_hash: &[u8; 32], onion_error: HTLCFailReason) -> bool {
 747                 let mut pending_htlc = {
 748                         match channel_state.claimable_htlcs.remove(payment_hash) {
 749                                 Some(pending_htlc) => pending_htlc,
 750                                 None => return false,
 751                         }
 752                 };
 753
 754                 match pending_htlc {
 755                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, .. } => {
 756                                 pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 757                         },
 758                         _ => {}
 759                 }
 760
 761                 match pending_htlc {
 762                         PendingOutboundHTLC::CycledRoute { .. } => { panic!("WAT"); },
 763                         PendingOutboundHTLC::OutboundRoute { .. } => {
 764                                 //TODO: DECRYPT route from OutboundRoute
 765                                 mem::drop(channel_state);
 766                                 let mut pending_events = self.pending_events.lock().unwrap();
 767                                 pending_events.push(events::Event::PaymentFailed {
 768                                         payment_hash: payment_hash.clone()
 769                                 });
 770                                 false
 771                         },
 772                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret } => {
 773                                 let err_packet = match onion_error {
 774                                         HTLCFailReason::Reason { failure_code, data } => {
 775                                                 let packet = ChannelManager::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
 776                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
 777                                         },
 778                                         HTLCFailReason::ErrorPacket { err } => {
 779                                                 ChannelManager::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
 780                                         }
 781                                 };
 782
 783                                 let (node_id, fail_msgs) = {
 784                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 785                                                 Some(chan_id) => chan_id.clone(),
 786                                                 None => return false
 787                                         };
 788
 789                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
 790                                         match chan.get_update_fail_htlc_and_commit(payment_hash, err_packet) {
 791                                                 Ok(msg) => (chan.get_their_node_id(), msg),
 792                                                 Err(_e) => {
 793                                                         //TODO: Do something with e?
 794                                                         return false;
 795                                                 },
 796                                         }
 797                                 };
 798
 799                                 match fail_msgs {
 800                                         Some(msgs) => {
 801                                                 mem::drop(channel_state);
 802                                                 let mut pending_events = self.pending_events.lock().unwrap();
 803                                                 pending_events.push(events::Event::SendFailHTLC {
 804                                                         node_id,
 805                                                         msg: msgs.0,
 806                                                         commitment_msg: msgs.1,
 807                                                 });
 808                                         },
 809                                         None => {},
 810                                 }
 811
 812                                 true
 813                         },
 814                 }
 815         }
 816
 817         /// Provides a payment preimage in response to a PaymentReceived event, returning true and
 818         /// generating message events for the net layer to claim the payment, if possible. Thus, you
 819         /// should probably kick the net layer to go send messages if this returns true!
 820         /// May panic if called except in response to a PaymentReceived event.
 821         pub fn claim_funds(&self, payment_preimage: [u8; 32]) -> bool {
 822                 self.claim_funds_internal(payment_preimage, true)
 823         }
 824         pub fn claim_funds_internal(&self, payment_preimage: [u8; 32], from_user: bool) -> bool {
 825                 let mut sha = Sha256::new();
 826                 sha.input(&payment_preimage);
 827                 let mut payment_hash = [0; 32];
 828                 sha.result(&mut payment_hash);
 829
 830                 let mut channel_state = self.channel_state.lock().unwrap();
 831                 let mut pending_htlc = {
 832                         match channel_state.claimable_htlcs.remove(&payment_hash) {
 833                                 Some(pending_htlc) => pending_htlc,
 834                                 None => return false,
 835                         }
 836                 };
 837
 838                 match pending_htlc {
 839                         PendingOutboundHTLC::CycledRoute { source_short_channel_id, incoming_packet_shared_secret, route } => {
 840                                 if from_user { // This was the end hop back to us
 841                                         pending_htlc = PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret };
 842                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::OutboundRoute { route });
 843                                 } else { // This came from the first upstream node
 844                                         // Bank error in our favor! Maybe we should tell the user this somehow???
 845                                         pending_htlc = PendingOutboundHTLC::OutboundRoute { route };
 846                                         channel_state.claimable_htlcs.insert(payment_hash, PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, incoming_packet_shared_secret });
 847                                 }
 848                         },
 849                         _ => {},
 850                 }
 851
 852                 match pending_htlc {
 853                         PendingOutboundHTLC::CycledRoute { .. } => { panic!("WAT"); },
 854                         PendingOutboundHTLC::OutboundRoute { .. } => {
 855                                 if from_user {
 856                                         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...");
 857                                 }
 858                                 mem::drop(channel_state);
 859                                 let mut pending_events = self.pending_events.lock().unwrap();
 860                                 pending_events.push(events::Event::PaymentSent {
 861                                         payment_preimage
 862                                 });
 863                                 false
 864                         },
 865                         PendingOutboundHTLC::IntermediaryHopData { source_short_channel_id, .. } => {
 866                                 let (node_id, fulfill_msgs, monitor) = {
 867                                         let chan_id = match channel_state.short_to_id.get(&source_short_channel_id) {
 868                                                 Some(chan_id) => chan_id.clone(),
 869                                                 None => return false
 870                                         };
 871
 872                                         let chan = channel_state.by_id.get_mut(&chan_id).unwrap();
 873                                         match chan.get_update_fulfill_htlc_and_commit(payment_preimage) {
 874                                                 Ok(msg) => (chan.get_their_node_id(), msg, if from_user { Some(chan.channel_monitor()) } else { None }),
 875                                                 Err(_e) => {
 876                                                         //TODO: Do something with e?
 877                                                         return false;
 878                                                 },
 879                                         }
 880                                 };
 881
 882                                 mem::drop(channel_state);
 883                                 match fulfill_msgs {
 884                                         Some(msgs) => {
 885                                                 let mut pending_events = self.pending_events.lock().unwrap();
 886                                                 pending_events.push(events::Event::SendFulfillHTLC {
 887                                                         node_id: node_id,
 888                                                         msg: msgs.0,
 889                                                         commitment_msg: msgs.1,
 890                                                 });
 891                                         },
 892                                         None => {},
 893                                 }
 894
 895                                 //TODO: It may not be possible to handle add_update_monitor fails gracefully, maybe
 896                                 //it should return no Err? Sadly, panic!()s instead doesn't help much :(
 897                                 if from_user {
 898                                         match self.monitor.add_update_monitor(monitor.as_ref().unwrap().get_funding_txo().unwrap(), monitor.unwrap()) {
 899                                                 Ok(()) => true,
 900                                                 Err(_) => true,
 901                                         }
 902                                 } else { true }
 903                         },
 904                 }
 905         }
 906
 907         /// Gets the node_id held by this ChannelManager
 908         pub fn get_our_node_id(&self) -> PublicKey {
 909                 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).unwrap()
 910         }
 911 }
 912
 913 impl events::EventsProvider for ChannelManager {
 914         fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
 915                 let mut pending_events = self.pending_events.lock().unwrap();
 916                 let mut ret = Vec::new();
 917                 mem::swap(&mut ret, &mut *pending_events);
 918                 ret
 919         }
 920 }
 921
 922 impl ChainListener for ChannelManager {
 923         fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
 924                 let mut new_funding_locked_messages = Vec::new();
 925                 {
 926                         let mut channel_state = self.channel_state.lock().unwrap();
 927                         let mut short_to_ids_to_insert = Vec::new();
 928                         for channel in channel_state.by_id.values_mut() {
 929                                 match channel.block_connected(header, height, txn_matched, indexes_of_txn_matched) {
 930                                         Some(funding_locked) => {
 931                                                 let announcement_sigs = match self.get_announcement_sigs(channel) {
 932                                                         Ok(res) => res,
 933                                                         Err(_e) => {
 934                                                                 //TODO: push e on events and blow up the channel (it has bad keys)
 935                                                                 continue;
 936                                                         }
 937                                                 };
 938                                                 new_funding_locked_messages.push(events::Event::SendFundingLocked {
 939                                                         node_id: channel.get_their_node_id(),
 940                                                         msg: funding_locked,
 941                                                         announcement_sigs: announcement_sigs
 942                                                 });
 943                                                 short_to_ids_to_insert.push((channel.get_short_channel_id().unwrap(), channel.channel_id()));
 944                                         },
 945                                         None => {}
 946                                 }
 947                                 //TODO: Check if channel was closed (or disabled) here
 948                         }
 949                         for to_insert in short_to_ids_to_insert {
 950                                 channel_state.short_to_id.insert(to_insert.0, to_insert.1);
 951                         }
 952                 }
 953                 let mut pending_events = self.pending_events.lock().unwrap();
 954                 for funding_locked in new_funding_locked_messages.drain(..) {
 955                         pending_events.push(funding_locked);
 956                 }
 957         }
 958
 959         fn block_disconnected(&self, header: &BlockHeader) {
 960                 let mut channel_state = self.channel_state.lock().unwrap();
 961                 for channel in channel_state.by_id.values_mut() {
 962                         if channel.block_disconnected(header) {
 963                                 //TODO Close channel here
 964                         }
 965                 }
 966         }
 967 }
 968
 969 impl ChannelMessageHandler for ChannelManager {
 970         //TODO: Handle errors and close channel (or so)
 971         fn handle_open_channel(&self, their_node_id: &PublicKey, msg: &msgs::OpenChannel) -> Result<msgs::AcceptChannel, HandleError> {
 972                 if msg.chain_hash != self.genesis_hash {
 973                         return Err(HandleError{err: "Unknown genesis block hash", msg: None});
 974                 }
 975                 let mut channel_state = self.channel_state.lock().unwrap();
 976                 if channel_state.by_id.contains_key(&msg.temporary_channel_id) {
 977                         return Err(HandleError{err: "temporary_channel_id collision!", msg: None});
 978                 }
 979                 let channel = Channel::new_from_req(&*self.fee_estimator, their_node_id.clone(), msg, 0, self.announce_channels_publicly)?;
 980                 let accept_msg = channel.get_accept_channel()?;
 981                 channel_state.by_id.insert(channel.channel_id(), channel);
 982                 Ok(accept_msg)
 983         }
 984
 985         fn handle_accept_channel(&self, their_node_id: &PublicKey, msg: &msgs::AcceptChannel) -> Result<(), HandleError> {
 986                 let (value, output_script, user_id) = {
 987                         let mut channel_state = self.channel_state.lock().unwrap();
 988                         match channel_state.by_id.get_mut(&msg.temporary_channel_id) {
 989                                 Some(chan) => {
 990                                         if chan.get_their_node_id() != *their_node_id {
 991                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
 992                                         }
 993                                         chan.accept_channel(&msg)?;
 994                                         (chan.get_value_satoshis(), chan.get_funding_redeemscript().to_v0_p2wsh(), chan.get_user_id())
 995                                 },
 996                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
 997                         }
 998                 };
 999                 let mut pending_events = self.pending_events.lock().unwrap();
1000                 pending_events.push(events::Event::FundingGenerationReady {
1001                         temporary_channel_id: msg.temporary_channel_id,
1002                         channel_value_satoshis: value,
1003                         output_script: output_script,
1004                         user_channel_id: user_id,
1005                 });
1006                 Ok(())
1007         }
1008
1009         fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<msgs::FundingSigned, HandleError> {
1010                 //TODO: broke this - a node shouldn't be able to get their channel removed by sending a
1011                 //funding_created a second time, or long after the first, or whatever (note this also
1012                 //leaves the short_to_id map in a busted state.
1013                 let chan = {
1014                         let mut channel_state = self.channel_state.lock().unwrap();
1015                         match channel_state.by_id.remove(&msg.temporary_channel_id) {
1016                                 Some(mut chan) => {
1017                                         if chan.get_their_node_id() != *their_node_id {
1018                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1019                                         }
1020                                         match chan.funding_created(msg) {
1021                                                 Ok(funding_msg) => {
1022                                                         (chan, funding_msg)
1023                                                 },
1024                                                 Err(e) => {
1025                                                         return Err(e);
1026                                                 }
1027                                         }
1028                                 },
1029                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1030                         }
1031                 }; // Release channel lock for install_watch_outpoint call,
1032                    // note that this means if the remote end is misbehaving and sends a message for the same
1033                    // channel back-to-back with funding_created, we'll end up thinking they sent a message
1034                    // for a bogus channel.
1035                 let chan_monitor = chan.0.channel_monitor();
1036                 self.monitor.add_update_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor)?;
1037                 let mut channel_state = self.channel_state.lock().unwrap();
1038                 channel_state.by_id.insert(chan.1.channel_id, chan.0);
1039                 Ok(chan.1)
1040         }
1041
1042         fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), HandleError> {
1043                 let (funding_txo, user_id) = {
1044                         let mut channel_state = self.channel_state.lock().unwrap();
1045                         match channel_state.by_id.get_mut(&msg.channel_id) {
1046                                 Some(chan) => {
1047                                         if chan.get_their_node_id() != *their_node_id {
1048                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1049                                         }
1050                                         chan.funding_signed(&msg)?;
1051                                         (chan.get_funding_txo().unwrap(), chan.get_user_id())
1052                                 },
1053                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1054                         }
1055                 };
1056                 let mut pending_events = self.pending_events.lock().unwrap();
1057                 pending_events.push(events::Event::FundingBroadcastSafe {
1058                         funding_txo: funding_txo,
1059                         user_channel_id: user_id,
1060                 });
1061                 Ok(())
1062         }
1063
1064         fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<Option<msgs::AnnouncementSignatures>, HandleError> {
1065                 let mut channel_state = self.channel_state.lock().unwrap();
1066                 match channel_state.by_id.get_mut(&msg.channel_id) {
1067                         Some(chan) => {
1068                                 if chan.get_their_node_id() != *their_node_id {
1069                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1070                                 }
1071                                 chan.funding_locked(&msg)?;
1072                                 return Ok(self.get_announcement_sigs(chan)?);
1073                         },
1074                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1075                 };
1076         }
1077
1078         fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>), HandleError> {
1079                 let res = {
1080                         let mut channel_state = self.channel_state.lock().unwrap();
1081
1082                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1083                                 hash_map::Entry::Occupied(mut chan_entry) => {
1084                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1085                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1086                                         }
1087                                         let res = chan_entry.get_mut().shutdown(&*self.fee_estimator, &msg)?;
1088                                         if chan_entry.get().is_shutdown() {
1089                                                 chan_entry.remove_entry();
1090                                         }
1091                                         res
1092                                 },
1093                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1094                         }
1095                 };
1096                 for payment_hash in res.2 {
1097                         // unknown_next_peer...I dunno who that is anymore....
1098                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 10, data: Vec::new() });
1099                 }
1100                 Ok((res.0, res.1))
1101         }
1102
1103         fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<Option<msgs::ClosingSigned>, HandleError> {
1104                 let res = {
1105                         let mut channel_state = self.channel_state.lock().unwrap();
1106                         match channel_state.by_id.entry(msg.channel_id.clone()) {
1107                                 hash_map::Entry::Occupied(mut chan_entry) => {
1108                                         if chan_entry.get().get_their_node_id() != *their_node_id {
1109                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1110                                         }
1111                                         let res = chan_entry.get_mut().closing_signed(&*self.fee_estimator, &msg)?;
1112                                         if res.1.is_some() {
1113                                                 // We're done with this channel, we've got a signed closing transaction and
1114                                                 // will send the closing_signed back to the remote peer upon return. This
1115                                                 // also implies there are no pending HTLCs left on the channel, so we can
1116                                                 // fully delete it from tracking (the channel monitor is still around to
1117                                                 // watch for old state broadcasts)!
1118                                                 chan_entry.remove_entry();
1119                                         }
1120                                         res
1121                                 },
1122                                 hash_map::Entry::Vacant(_) => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1123                         }
1124                 };
1125                 if let Some(broadcast_tx) = res.1 {
1126                         self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
1127                 }
1128                 Ok(res.0)
1129         }
1130
1131         fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), msgs::HandleError> {
1132                 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
1133                 //determine the state of the payment based on our response/if we forward anything/the time
1134                 //we take to respond. We should take care to avoid allowing such an attack.
1135                 //
1136                 //TODO: There exists a further attack where a node may garble the onion data, forward it to
1137                 //us repeatedly garbled in different ways, and compare our error messages, which are
1138                 //encrypted with the same key. Its not immediately obvious how to usefully exploit that,
1139                 //but we should prevent it anyway.
1140
1141                 let shared_secret = SharedSecret::new(&self.secp_ctx, &msg.onion_routing_packet.public_key, &self.our_network_key);
1142                 let (rho, mu) = ChannelManager::gen_rho_mu_from_shared_secret(&shared_secret);
1143
1144                 let associated_data = Vec::new(); //TODO: What to put here?
1145
1146                 macro_rules! get_onion_hash {
1147                         () => {
1148                                 {
1149                                         let mut sha = Sha256::new();
1150                                         sha.input(&msg.onion_routing_packet.hop_data);
1151                                         let mut onion_hash = [0; 32];
1152                                         sha.result(&mut onion_hash);
1153                                         onion_hash
1154                                 }
1155                         }
1156                 }
1157
1158                 macro_rules! return_err {
1159                         ($msg: expr, $err_code: expr, $data: expr) => {
1160                                 return Err(msgs::HandleError {
1161                                         err: $msg,
1162                                         msg: Some(msgs::ErrorAction::UpdateFailHTLC {
1163                                                 msg: msgs::UpdateFailHTLC {
1164                                                         channel_id: msg.channel_id,
1165                                                         htlc_id: msg.htlc_id,
1166                                                         reason: ChannelManager::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
1167                                                 }
1168                                         }),
1169                                 });
1170                         }
1171                 }
1172
1173                 if msg.onion_routing_packet.version != 0 {
1174                         //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
1175                         //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
1176                         //the hash doesn't really serve any purpuse - in the case of hashing all data, the
1177                         //receiving node would have to brute force to figure out which version was put in the
1178                         //packet by the node that send us the message, in the case of hashing the hop_data, the
1179                         //node knows the HMAC matched, so they already know what is there...
1180                         return_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4, &get_onion_hash!());
1181                 }
1182
1183                 let mut hmac = Hmac::new(Sha256::new(), &mu);
1184                 hmac.input(&msg.onion_routing_packet.hop_data);
1185                 hmac.input(&associated_data[..]);
1186                 if hmac.result() != MacResult::new(&msg.onion_routing_packet.hmac) {
1187                         return_err!("HMAC Check failed", 0x8000 | 0x4000 | 5, &get_onion_hash!());
1188                 }
1189
1190                 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
1191                 let next_hop_data = {
1192                         let mut decoded = [0; 65];
1193                         chacha.process(&msg.onion_routing_packet.hop_data[0..65], &mut decoded);
1194                         match msgs::OnionHopData::decode(&decoded[..]) {
1195                                 Err(err) => {
1196                                         let error_code = match err {
1197                                                 msgs::DecodeError::UnknownRealmByte => 0x4000 | 1,
1198                                                 _ => 0x2000 | 2, // Should never happen
1199                                         };
1200                                         return_err!("Unable to decode our hop data", error_code, &[0;0]);
1201                                 },
1202                                 Ok(msg) => msg
1203                         }
1204                 };
1205
1206                 let mut pending_forward_info = if next_hop_data.hmac == [0; 32] {
1207                                 // OUR PAYMENT!
1208                                 if next_hop_data.data.amt_to_forward != msg.amount_msat {
1209                                         return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
1210                                 }
1211                                 if next_hop_data.data.outgoing_cltv_value != msg.cltv_expiry {
1212                                         return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
1213                                 }
1214
1215                                 // Note that we could obviously respond immediately with an update_fulfill_htlc
1216                                 // message, however that would leak that we are the recipient of this payment, so
1217                                 // instead we stay symmetric with the forwarding case, only responding (after a
1218                                 // delay) once they've send us a commitment_signed!
1219
1220                                 PendingForwardHTLCInfo {
1221                                         onion_packet: None,
1222                                         payment_hash: msg.payment_hash.clone(),
1223                                         short_channel_id: 0,
1224                                         prev_short_channel_id: 0,
1225                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1226                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1227                                 }
1228                         } else {
1229                                 let mut new_packet_data = [0; 20*65];
1230                                 chacha.process(&msg.onion_routing_packet.hop_data[65..], &mut new_packet_data[0..19*65]);
1231                                 chacha.process(&ChannelManager::ZERO[0..65], &mut new_packet_data[19*65..]);
1232
1233                                 let mut new_pubkey = msg.onion_routing_packet.public_key.clone();
1234
1235                                 let blinding_factor = {
1236                                         let mut sha = Sha256::new();
1237                                         sha.input(&new_pubkey.serialize()[..]);
1238                                         sha.input(&shared_secret[..]);
1239                                         let mut res = [0u8; 32];
1240                                         sha.result(&mut res);
1241                                         match SecretKey::from_slice(&self.secp_ctx, &res) {
1242                                                 Err(_) => {
1243                                                         // Return temporary node failure as its technically our issue, not the
1244                                                         // channel's issue.
1245                                                         return_err!("Blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1246                                                 },
1247                                                 Ok(key) => key
1248                                         }
1249                                 };
1250
1251                                 match new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor) {
1252                                         Err(_) => {
1253                                                 // Return temporary node failure as its technically our issue, not the
1254                                                 // channel's issue.
1255                                                 return_err!("New blinding factor is an invalid private key", 0x2000 | 2, &[0;0]);
1256                                         },
1257                                         Ok(_) => {}
1258                                 };
1259
1260                                 let outgoing_packet = msgs::OnionPacket {
1261                                         version: 0,
1262                                         public_key: new_pubkey,
1263                                         hop_data: new_packet_data,
1264                                         hmac: next_hop_data.hmac.clone(),
1265                                 };
1266
1267                                 //TODO: Check amt_to_forward and outgoing_cltv_value are within acceptable ranges!
1268
1269                                 PendingForwardHTLCInfo {
1270                                         onion_packet: Some(outgoing_packet),
1271                                         payment_hash: msg.payment_hash.clone(),
1272                                         short_channel_id: next_hop_data.data.short_channel_id,
1273                                         prev_short_channel_id: 0,
1274                                         amt_to_forward: next_hop_data.data.amt_to_forward,
1275                                         outgoing_cltv_value: next_hop_data.data.outgoing_cltv_value,
1276                                 }
1277                         };
1278
1279                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1280                 let channel_state = channel_state_lock.borrow_parts();
1281
1282                 if pending_forward_info.onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
1283                         let forwarding_id = match channel_state.short_to_id.get(&pending_forward_info.short_channel_id) {
1284                                 None => {
1285                                         return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
1286                                 },
1287                                 Some(id) => id.clone(),
1288                         };
1289                         let chan = channel_state.by_id.get_mut(&forwarding_id).unwrap();
1290                         if !chan.is_live() {
1291                                 let chan_update = self.get_channel_update(chan).unwrap();
1292                                 return_err!("Forwarding channel is not in a ready state.", 0x4000 | 10, &chan_update.encode()[..]);
1293                         }
1294                 }
1295
1296                 let claimable_htlcs_entry = channel_state.claimable_htlcs.entry(msg.payment_hash.clone());
1297
1298                 // We dont correctly handle payments that route through us twice on their way to their
1299                 // destination. That's OK since those nodes are probably busted or trying to do network
1300                 // mapping through repeated loops. In either case, we want them to stop talking to us, so
1301                 // we send permanent_node_failure.
1302                 match &claimable_htlcs_entry {
1303                         &hash_map::Entry::Occupied(ref e) => {
1304                                 let mut acceptable_cycle = false;
1305                                 match e.get() {
1306                                         &PendingOutboundHTLC::OutboundRoute { .. } => {
1307                                                 acceptable_cycle = pending_forward_info.short_channel_id == 0;
1308                                         },
1309                                         _ => {},
1310                                 }
1311                                 if !acceptable_cycle {
1312                                         return_err!("Payment looped through us twice", 0x4000 | 0x2000 | 2, &[0;0]);
1313                                 }
1314                         },
1315                         _ => {},
1316                 }
1317
1318                 let (source_short_channel_id, res) = match channel_state.by_id.get_mut(&msg.channel_id) {
1319                         Some(chan) => {
1320                                 if chan.get_their_node_id() != *their_node_id {
1321                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1322                                 }
1323                                 if !chan.is_usable() {
1324                                         return Err(HandleError{err: "Channel not yet available for receiving HTLCs", msg: None});
1325                                 }
1326                                 let short_channel_id = chan.get_short_channel_id().unwrap();
1327                                 pending_forward_info.prev_short_channel_id = short_channel_id;
1328                                 (short_channel_id, chan.update_add_htlc(&msg, pending_forward_info)?)
1329                         },
1330                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None}), //TODO: panic?
1331                 };
1332
1333                 match claimable_htlcs_entry {
1334                         hash_map::Entry::Occupied(mut e) => {
1335                                 let outbound_route = e.get_mut();
1336                                 let route = match outbound_route {
1337                                         &mut PendingOutboundHTLC::OutboundRoute { ref route } => {
1338                                                 route.clone()
1339                                         },
1340                                         _ => { panic!("WAT") },
1341                                 };
1342                                 *outbound_route = PendingOutboundHTLC::CycledRoute {
1343                                         source_short_channel_id,
1344                                         incoming_packet_shared_secret: shared_secret,
1345                                         route
1346                                 };
1347                         },
1348                         hash_map::Entry::Vacant(e) => {
1349                                 e.insert(PendingOutboundHTLC::IntermediaryHopData {
1350                                         source_short_channel_id,
1351                                         incoming_packet_shared_secret: shared_secret,
1352                                 });
1353                         }
1354                 }
1355
1356                 Ok(res)
1357         }
1358
1359         fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), HandleError> {
1360                 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1361                 // Claim funds first, cause we don't really care if the channel we received the message on
1362                 // is broken, we may have enough info to get our own money!
1363                 self.claim_funds_internal(msg.payment_preimage.clone(), false);
1364
1365                 let monitor = {
1366                         let mut channel_state = self.channel_state.lock().unwrap();
1367                         match channel_state.by_id.get_mut(&msg.channel_id) {
1368                                 Some(chan) => {
1369                                         if chan.get_their_node_id() != *their_node_id {
1370                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1371                                         }
1372                                         chan.update_fulfill_htlc(&msg)?;
1373                                         chan.channel_monitor()
1374                                 },
1375                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1376                         }
1377                 };
1378                 self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor)?;
1379                 Ok(())
1380         }
1381
1382         fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<(), HandleError> {
1383                 let mut channel_state = self.channel_state.lock().unwrap();
1384                 match channel_state.by_id.get_mut(&msg.channel_id) {
1385                         Some(chan) => {
1386                                 if chan.get_their_node_id() != *their_node_id {
1387                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1388                                 }
1389                                 chan.update_fail_htlc(&msg, HTLCFailReason::ErrorPacket { err: msg.reason.clone() })
1390                         },
1391                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1392                 }
1393         }
1394
1395         fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), HandleError> {
1396                 let mut channel_state = self.channel_state.lock().unwrap();
1397                 match channel_state.by_id.get_mut(&msg.channel_id) {
1398                         Some(chan) => {
1399                                 if chan.get_their_node_id() != *their_node_id {
1400                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1401                                 }
1402                                 chan.update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() })
1403                         },
1404                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1405                 }
1406         }
1407
1408         fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>), HandleError> {
1409                 let (res, monitor) = {
1410                         let mut channel_state = self.channel_state.lock().unwrap();
1411                         match channel_state.by_id.get_mut(&msg.channel_id) {
1412                                 Some(chan) => {
1413                                         if chan.get_their_node_id() != *their_node_id {
1414                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1415                                         }
1416                                         (chan.commitment_signed(&msg)?, chan.channel_monitor())
1417                                 },
1418                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1419                         }
1420                 };
1421                 //TODO: Only if we store HTLC sigs
1422                 self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor)?;
1423
1424                 Ok(res)
1425         }
1426
1427         fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<Option<msgs::CommitmentUpdate>, HandleError> {
1428                 let ((res, mut pending_forwards, mut pending_failures), monitor) = {
1429                         let mut channel_state = self.channel_state.lock().unwrap();
1430                         match channel_state.by_id.get_mut(&msg.channel_id) {
1431                                 Some(chan) => {
1432                                         if chan.get_their_node_id() != *their_node_id {
1433                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1434                                         }
1435                                         (chan.revoke_and_ack(&msg)?, chan.channel_monitor())
1436                                 },
1437                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1438                         }
1439                 };
1440                 self.monitor.add_update_monitor(monitor.get_funding_txo().unwrap(), monitor)?;
1441                 for failure in pending_failures.drain(..) {
1442                         self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), &failure.0, failure.1);
1443                 }
1444
1445                 let mut forward_event = None;
1446                 if !pending_forwards.is_empty() {
1447                         let mut channel_state = self.channel_state.lock().unwrap();
1448                         if channel_state.forward_htlcs.is_empty() {
1449                                 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));
1450                                 channel_state.next_forward = forward_event.unwrap();
1451                         }
1452                         for forward_info in pending_forwards.drain(..) {
1453                                 match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
1454                                         hash_map::Entry::Occupied(mut entry) => {
1455                                                 entry.get_mut().push(forward_info);
1456                                         },
1457                                         hash_map::Entry::Vacant(entry) => {
1458                                                 entry.insert(vec!(forward_info));
1459                                         }
1460                                 }
1461                         }
1462                 }
1463                 match forward_event {
1464                         Some(time) => {
1465                                 let mut pending_events = self.pending_events.lock().unwrap();
1466                                 pending_events.push(events::Event::PendingHTLCsForwardable {
1467                                         time_forwardable: time
1468                                 });
1469                         }
1470                         None => {},
1471                 }
1472
1473                 Ok(res)
1474         }
1475
1476         fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), HandleError> {
1477                 let mut channel_state = self.channel_state.lock().unwrap();
1478                 match channel_state.by_id.get_mut(&msg.channel_id) {
1479                         Some(chan) => {
1480                                 if chan.get_their_node_id() != *their_node_id {
1481                                         return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1482                                 }
1483                                 chan.update_fee(&*self.fee_estimator, &msg)
1484                         },
1485                         None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1486                 }
1487         }
1488
1489         fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), HandleError> {
1490                 let (chan_announcement, chan_update) = {
1491                         let mut channel_state = self.channel_state.lock().unwrap();
1492                         match channel_state.by_id.get_mut(&msg.channel_id) {
1493                                 Some(chan) => {
1494                                         if chan.get_their_node_id() != *their_node_id {
1495                                                 return Err(HandleError{err: "Got a message for a channel from the wrong node!", msg: None})
1496                                         }
1497                                         if !chan.is_usable() {
1498                                                 return Err(HandleError{err: "Got an announcement_signatures before we were ready for it", msg: None });
1499                                         }
1500
1501                                         let our_node_id = self.get_our_node_id();
1502                                         let (announcement, our_bitcoin_sig) = chan.get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone())?;
1503
1504                                         let were_node_one = announcement.node_id_1 == our_node_id;
1505                                         let msghash = Message::from_slice(&Sha256dHash::from_data(&announcement.encode()[..])[..]).unwrap();
1506                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }));
1507                                         secp_call!(self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }));
1508
1509                                         let our_node_sig = secp_call!(self.secp_ctx.sign(&msghash, &self.our_network_key));
1510
1511                                         (msgs::ChannelAnnouncement {
1512                                                 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
1513                                                 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
1514                                                 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
1515                                                 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
1516                                                 contents: announcement,
1517                                         }, self.get_channel_update(chan).unwrap()) // can only fail if we're not in a ready state
1518                                 },
1519                                 None => return Err(HandleError{err: "Failed to find corresponding channel", msg: None})
1520                         }
1521                 };
1522                 let mut pending_events = self.pending_events.lock().unwrap();
1523                 pending_events.push(events::Event::BroadcastChannelAnnouncement { msg: chan_announcement, update_msg: chan_update });
1524                 Ok(())
1525         }
1526
1527         fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
1528                 let mut channel_state_lock = self.channel_state.lock().unwrap();
1529                 let channel_state = channel_state_lock.borrow_parts();
1530                 let short_to_id = channel_state.short_to_id;
1531                 if no_connection_possible {
1532                         channel_state.by_id.retain(move |_, chan| {
1533                                 if chan.get_their_node_id() == *their_node_id {
1534                                         match chan.get_short_channel_id() {
1535                                                 Some(short_id) => {
1536                                                         short_to_id.remove(&short_id);
1537                                                 },
1538                                                 None => {},
1539                                         }
1540                                         //TODO: get the latest commitment tx, any HTLC txn built on top of it, etc out
1541                                         //of the channel and throw those into the announcement blackhole.
1542                                         false
1543                                 } else {
1544                                         true
1545                                 }
1546                         });
1547                 } else {
1548                         for chan in channel_state.by_id {
1549                                 if chan.1.get_their_node_id() == *their_node_id {
1550                                         //TODO: mark channel disabled (and maybe announce such after a timeout). Also
1551                                         //fail and wipe any uncommitted outbound HTLCs as those are considered after
1552                                         //reconnect.
1553                                 }
1554                         }
1555                 }
1556         }
1557 }
1558
1559 #[cfg(test)]
1560 mod tests {
1561         use chain::chaininterface;
1562         use ln::channelmanager::{ChannelManager,OnionKeys};
1563         use ln::router::{Route, RouteHop, Router};
1564         use ln::msgs;
1565         use ln::msgs::{MsgEncodable,ChannelMessageHandler,RoutingMessageHandler};
1566         use util::test_utils;
1567         use util::events::{Event, EventsProvider};
1568
1569         use bitcoin::util::misc::hex_bytes;
1570         use bitcoin::util::hash::Sha256dHash;
1571         use bitcoin::util::uint::Uint256;
1572         use bitcoin::blockdata::block::BlockHeader;
1573         use bitcoin::blockdata::transaction::{Transaction, TxOut};
1574         use bitcoin::network::constants::Network;
1575         use bitcoin::network::serialize::serialize;
1576         use bitcoin::network::serialize::BitcoinHash;
1577
1578         use secp256k1::Secp256k1;
1579         use secp256k1::key::{PublicKey,SecretKey};
1580
1581         use crypto::sha2::Sha256;
1582         use crypto::digest::Digest;
1583
1584         use rand::{thread_rng,Rng};
1585
1586         use std::collections::HashMap;
1587         use std::default::Default;
1588         use std::sync::{Arc, Mutex};
1589         use std::time::Instant;
1590
1591         fn build_test_onion_keys() -> Vec<OnionKeys> {
1592                 // Keys from BOLT 4, used in both test vector tests
1593                 let secp_ctx = Secp256k1::new();
1594
1595                 let route = Route {
1596                         hops: vec!(
1597                                         RouteHop {
1598                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]).unwrap(),
1599                                                 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
1600                                         },
1601                                         RouteHop {
1602                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("0324653eac434488002cc06bbfb7f10fe18991e35f9fe4302dbea6d2353dc0ab1c").unwrap()[..]).unwrap(),
1603                                                 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
1604                                         },
1605                                         RouteHop {
1606                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("027f31ebc5462c1fdce1b737ecff52d37d75dea43ce11c74d25aa297165faa2007").unwrap()[..]).unwrap(),
1607                                                 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
1608                                         },
1609                                         RouteHop {
1610                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]).unwrap(),
1611                                                 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
1612                                         },
1613                                         RouteHop {
1614                                                 pubkey: PublicKey::from_slice(&secp_ctx, &hex_bytes("02edabbd16b41c8371b92ef2f04c1185b4f03b6dcd52ba9b78d9d7c89c8f221145").unwrap()[..]).unwrap(),
1615                                                 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
1616                                         },
1617                         ),
1618                 };
1619
1620                 let session_priv = SecretKey::from_slice(&secp_ctx, &hex_bytes("4141414141414141414141414141414141414141414141414141414141414141").unwrap()[..]).unwrap();
1621
1622                 let onion_keys = ChannelManager::construct_onion_keys(&secp_ctx, &route, &session_priv).unwrap();
1623                 assert_eq!(onion_keys.len(), route.hops.len());
1624                 onion_keys
1625         }
1626
1627         #[test]
1628         fn onion_vectors() {
1629                 // Packet creation test vectors from BOLT 4
1630                 let onion_keys = build_test_onion_keys();
1631
1632                 assert_eq!(onion_keys[0].shared_secret[..], hex_bytes("53eb63ea8a3fec3b3cd433b85cd62a4b145e1dda09391b348c4e1cd36a03ea66").unwrap()[..]);
1633                 assert_eq!(onion_keys[0].blinding_factor[..], hex_bytes("2ec2e5da605776054187180343287683aa6a51b4b1c04d6dd49c45d8cffb3c36").unwrap()[..]);
1634                 assert_eq!(onion_keys[0].ephemeral_pubkey.serialize()[..], hex_bytes("02eec7245d6b7d2ccb30380bfbe2a3648cd7a942653f5aa340edcea1f283686619").unwrap()[..]);
1635                 assert_eq!(onion_keys[0].rho, hex_bytes("ce496ec94def95aadd4bec15cdb41a740c9f2b62347c4917325fcc6fb0453986").unwrap()[..]);
1636                 assert_eq!(onion_keys[0].mu, hex_bytes("b57061dc6d0a2b9f261ac410c8b26d64ac5506cbba30267a649c28c179400eba").unwrap()[..]);
1637
1638                 assert_eq!(onion_keys[1].shared_secret[..], hex_bytes("a6519e98832a0b179f62123b3567c106db99ee37bef036e783263602f3488fae").unwrap()[..]);
1639                 assert_eq!(onion_keys[1].blinding_factor[..], hex_bytes("bf66c28bc22e598cfd574a1931a2bafbca09163df2261e6d0056b2610dab938f").unwrap()[..]);
1640                 assert_eq!(onion_keys[1].ephemeral_pubkey.serialize()[..], hex_bytes("028f9438bfbf7feac2e108d677e3a82da596be706cc1cf342b75c7b7e22bf4e6e2").unwrap()[..]);
1641                 assert_eq!(onion_keys[1].rho, hex_bytes("450ffcabc6449094918ebe13d4f03e433d20a3d28a768203337bc40b6e4b2c59").unwrap()[..]);
1642                 assert_eq!(onion_keys[1].mu, hex_bytes("05ed2b4a3fb023c2ff5dd6ed4b9b6ea7383f5cfe9d59c11d121ec2c81ca2eea9").unwrap()[..]);
1643
1644                 assert_eq!(onion_keys[2].shared_secret[..], hex_bytes("3a6b412548762f0dbccce5c7ae7bb8147d1caf9b5471c34120b30bc9c04891cc").unwrap()[..]);
1645                 assert_eq!(onion_keys[2].blinding_factor[..], hex_bytes("a1f2dadd184eb1627049673f18c6325814384facdee5bfd935d9cb031a1698a5").unwrap()[..]);
1646                 assert_eq!(onion_keys[2].ephemeral_pubkey.serialize()[..], hex_bytes("03bfd8225241ea71cd0843db7709f4c222f62ff2d4516fd38b39914ab6b83e0da0").unwrap()[..]);
1647                 assert_eq!(onion_keys[2].rho, hex_bytes("11bf5c4f960239cb37833936aa3d02cea82c0f39fd35f566109c41f9eac8deea").unwrap()[..]);
1648                 assert_eq!(onion_keys[2].mu, hex_bytes("caafe2820fa00eb2eeb78695ae452eba38f5a53ed6d53518c5c6edf76f3f5b78").unwrap()[..]);
1649
1650                 assert_eq!(onion_keys[3].shared_secret[..], hex_bytes("21e13c2d7cfe7e18836df50872466117a295783ab8aab0e7ecc8c725503ad02d").unwrap()[..]);
1651                 assert_eq!(onion_keys[3].blinding_factor[..], hex_bytes("7cfe0b699f35525029ae0fa437c69d0f20f7ed4e3916133f9cacbb13c82ff262").unwrap()[..]);
1652                 assert_eq!(onion_keys[3].ephemeral_pubkey.serialize()[..], hex_bytes("031dde6926381289671300239ea8e57ffaf9bebd05b9a5b95beaf07af05cd43595").unwrap()[..]);
1653                 assert_eq!(onion_keys[3].rho, hex_bytes("cbe784ab745c13ff5cffc2fbe3e84424aa0fd669b8ead4ee562901a4a4e89e9e").unwrap()[..]);
1654                 assert_eq!(onion_keys[3].mu, hex_bytes("5052aa1b3d9f0655a0932e50d42f0c9ba0705142c25d225515c45f47c0036ee9").unwrap()[..]);
1655
1656                 assert_eq!(onion_keys[4].shared_secret[..], hex_bytes("b5756b9b542727dbafc6765a49488b023a725d631af688fc031217e90770c328").unwrap()[..]);
1657                 assert_eq!(onion_keys[4].blinding_factor[..], hex_bytes("c96e00dddaf57e7edcd4fb5954be5b65b09f17cb6d20651b4e90315be5779205").unwrap()[..]);
1658                 assert_eq!(onion_keys[4].ephemeral_pubkey.serialize()[..], hex_bytes("03a214ebd875aab6ddfd77f22c5e7311d7f77f17a169e599f157bbcdae8bf071f4").unwrap()[..]);
1659                 assert_eq!(onion_keys[4].rho, hex_bytes("034e18b8cc718e8af6339106e706c52d8df89e2b1f7e9142d996acf88df8799b").unwrap()[..]);
1660                 assert_eq!(onion_keys[4].mu, hex_bytes("8e45e5c61c2b24cb6382444db6698727afb063adecd72aada233d4bf273d975a").unwrap()[..]);
1661
1662                 // Test vectors below are flat-out wrong: they claim to set outgoing_cltv_value to non-0 :/
1663                 let payloads = vec!(
1664                         msgs::OnionHopData {
1665                                 realm: 0,
1666                                 data: msgs::OnionRealm0HopData {
1667                                         short_channel_id: 0,
1668                                         amt_to_forward: 0,
1669                                         outgoing_cltv_value: 0,
1670                                 },
1671                                 hmac: [0; 32],
1672                         },
1673                         msgs::OnionHopData {
1674                                 realm: 0,
1675                                 data: msgs::OnionRealm0HopData {
1676                                         short_channel_id: 0x0101010101010101,
1677                                         amt_to_forward: 0x0100000001,
1678                                         outgoing_cltv_value: 0,
1679                                 },
1680                                 hmac: [0; 32],
1681                         },
1682                         msgs::OnionHopData {
1683                                 realm: 0,
1684                                 data: msgs::OnionRealm0HopData {
1685                                         short_channel_id: 0x0202020202020202,
1686                                         amt_to_forward: 0x0200000002,
1687                                         outgoing_cltv_value: 0,
1688                                 },
1689                                 hmac: [0; 32],
1690                         },
1691                         msgs::OnionHopData {
1692                                 realm: 0,
1693                                 data: msgs::OnionRealm0HopData {
1694                                         short_channel_id: 0x0303030303030303,
1695                                         amt_to_forward: 0x0300000003,
1696                                         outgoing_cltv_value: 0,
1697                                 },
1698                                 hmac: [0; 32],
1699                         },
1700                         msgs::OnionHopData {
1701                                 realm: 0,
1702                                 data: msgs::OnionRealm0HopData {
1703                                         short_channel_id: 0x0404040404040404,
1704                                         amt_to_forward: 0x0400000004,
1705                                         outgoing_cltv_value: 0,
1706                                 },
1707                                 hmac: [0; 32],
1708                         },
1709                 );
1710
1711                 let packet = ChannelManager::construct_onion_packet(payloads, onion_keys, hex_bytes("4242424242424242424242424242424242424242424242424242424242424242").unwrap()).unwrap();
1712                 // Just check the final packet encoding, as it includes all the per-hop vectors in it
1713                 // anyway...
1714                 assert_eq!(packet.encode(), hex_bytes("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").unwrap());
1715         }
1716
1717         #[test]
1718         fn test_failure_packet_onion() {
1719                 // Returning Errors test vectors from BOLT 4
1720
1721                 let onion_keys = build_test_onion_keys();
1722                 let onion_error = ChannelManager::build_failure_packet(&onion_keys[4].shared_secret, 0x2002, &[0; 0]);
1723                 assert_eq!(onion_error.encode(), hex_bytes("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").unwrap());
1724
1725                 let onion_packet_1 = ChannelManager::encrypt_failure_packet(&onion_keys[4].shared_secret, &onion_error.encode()[..]);
1726                 assert_eq!(onion_packet_1.data, hex_bytes("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").unwrap());
1727
1728                 let onion_packet_2 = ChannelManager::encrypt_failure_packet(&onion_keys[3].shared_secret, &onion_packet_1.data[..]);
1729                 assert_eq!(onion_packet_2.data, hex_bytes("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").unwrap());
1730
1731                 let onion_packet_3 = ChannelManager::encrypt_failure_packet(&onion_keys[2].shared_secret, &onion_packet_2.data[..]);
1732                 assert_eq!(onion_packet_3.data, hex_bytes("a5d3e8634cfe78b2307d87c6d90be6fe7855b4f2cc9b1dfb19e92e4b79103f61ff9ac25f412ddfb7466e74f81b3e545563cdd8f5524dae873de61d7bdfccd496af2584930d2b566b4f8d3881f8c043df92224f38cf094cfc09d92655989531524593ec6d6caec1863bdfaa79229b5020acc034cd6deeea1021c50586947b9b8e6faa83b81fbfa6133c0af5d6b07c017f7158fa94f0d206baf12dda6b68f785b773b360fd0497e16cc402d779c8d48d0fa6315536ef0660f3f4e1865f5b38ea49c7da4fd959de4e83ff3ab686f059a45c65ba2af4a6a79166aa0f496bf04d06987b6d2ea205bdb0d347718b9aeff5b61dfff344993a275b79717cd815b6ad4c0beb568c4ac9c36ff1c315ec1119a1993c4b61e6eaa0375e0aaf738ac691abd3263bf937e3").unwrap());
1733
1734                 let onion_packet_4 = ChannelManager::encrypt_failure_packet(&onion_keys[1].shared_secret, &onion_packet_3.data[..]);
1735                 assert_eq!(onion_packet_4.data, hex_bytes("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").unwrap());
1736
1737                 let onion_packet_5 = ChannelManager::encrypt_failure_packet(&onion_keys[0].shared_secret, &onion_packet_4.data[..]);
1738                 assert_eq!(onion_packet_5.data, hex_bytes("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").unwrap());
1739         }
1740
1741         fn confirm_transaction(chain: &chaininterface::ChainWatchInterfaceUtil, tx: &Transaction, chan_id: u32) {
1742                 let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
1743                 chain.block_connected_checked(&header, 1, &[tx; 1], &[chan_id; 1]);
1744                 for i in 2..100 {
1745                         header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
1746                         chain.block_connected_checked(&header, i, &[tx; 0], &[0; 0]);
1747                 }
1748         }
1749
1750         static mut CHAN_COUNT: u32 = 0;
1751         fn create_chan_between_nodes(node_a: &ChannelManager, chain_a: &chaininterface::ChainWatchInterfaceUtil, monitor_a: &test_utils::TestChannelMonitor, node_b: &ChannelManager, chain_b: &chaininterface::ChainWatchInterfaceUtil, monitor_b: &test_utils::TestChannelMonitor) -> (msgs::ChannelAnnouncement, msgs::ChannelUpdate, msgs::ChannelUpdate, Uint256, Transaction) {
1752                 let open_chan = node_a.create_channel(node_b.get_our_node_id(), 100000, 42).unwrap();
1753                 let accept_chan = node_b.handle_open_channel(&node_a.get_our_node_id(), &open_chan).unwrap();
1754                 node_a.handle_accept_channel(&node_b.get_our_node_id(), &accept_chan).unwrap();
1755
1756                 let chan_id = unsafe { CHAN_COUNT };
1757                 let tx;
1758                 let funding_output;
1759
1760                 let events_1 = node_a.get_and_clear_pending_events();
1761                 assert_eq!(events_1.len(), 1);
1762                 match events_1[0] {
1763                         Event::FundingGenerationReady { ref temporary_channel_id, ref channel_value_satoshis, ref output_script, user_channel_id } => {
1764                                 assert_eq!(*channel_value_satoshis, 100000);
1765                                 assert_eq!(user_channel_id, 42);
1766
1767                                 tx = Transaction { version: chan_id as u32, lock_time: 0, input: Vec::new(), output: vec![TxOut {
1768                                         value: *channel_value_satoshis, script_pubkey: output_script.clone(),
1769                                 }]};
1770                                 funding_output = (Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
1771
1772                                 node_a.funding_transaction_generated(&temporary_channel_id, funding_output.clone());
1773                                 let mut added_monitors = monitor_a.added_monitors.lock().unwrap();
1774                                 assert_eq!(added_monitors.len(), 1);
1775                                 assert_eq!(added_monitors[0].0, funding_output);
1776                                 added_monitors.clear();
1777                         },
1778                         _ => panic!("Unexpected event"),
1779                 }
1780
1781                 let events_2 = node_a.get_and_clear_pending_events();
1782                 assert_eq!(events_2.len(), 1);
1783                 let funding_signed = match events_2[0] {
1784                         Event::SendFundingCreated { ref node_id, ref msg } => {
1785                                 assert_eq!(*node_id, node_b.get_our_node_id());
1786                                 let res = node_b.handle_funding_created(&node_a.get_our_node_id(), msg).unwrap();
1787                                 let mut added_monitors = monitor_b.added_monitors.lock().unwrap();
1788                                 assert_eq!(added_monitors.len(), 1);
1789                                 assert_eq!(added_monitors[0].0, funding_output);
1790                                 added_monitors.clear();
1791                                 res
1792                         },
1793                         _ => panic!("Unexpected event"),
1794                 };
1795
1796                 node_a.handle_funding_signed(&node_b.get_our_node_id(), &funding_signed).unwrap();
1797
1798                 let events_3 = node_a.get_and_clear_pending_events();
1799                 assert_eq!(events_3.len(), 1);
1800                 match events_3[0] {
1801                         Event::FundingBroadcastSafe { ref funding_txo, user_channel_id } => {
1802                                 assert_eq!(user_channel_id, 42);
1803                                 assert_eq!(*funding_txo, funding_output);
1804                         },
1805                         _ => panic!("Unexpected event"),
1806                 };
1807
1808                 confirm_transaction(&chain_a, &tx, chan_id);
1809                 let events_4 = node_a.get_and_clear_pending_events();
1810                 assert_eq!(events_4.len(), 1);
1811                 match events_4[0] {
1812                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
1813                                 assert_eq!(*node_id, node_b.get_our_node_id());
1814                                 assert!(announcement_sigs.is_none());
1815                                 node_b.handle_funding_locked(&node_a.get_our_node_id(), msg).unwrap()
1816                         },
1817                         _ => panic!("Unexpected event"),
1818                 };
1819
1820                 let channel_id;
1821
1822                 confirm_transaction(&chain_b, &tx, chan_id);
1823                 let events_5 = node_b.get_and_clear_pending_events();
1824                 assert_eq!(events_5.len(), 1);
1825                 let as_announcement_sigs = match events_5[0] {
1826                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
1827                                 assert_eq!(*node_id, node_a.get_our_node_id());
1828                                 channel_id = msg.channel_id.clone();
1829                                 let as_announcement_sigs = node_a.handle_funding_locked(&node_b.get_our_node_id(), msg).unwrap().unwrap();
1830                                 node_a.handle_announcement_signatures(&node_b.get_our_node_id(), &(*announcement_sigs).clone().unwrap()).unwrap();
1831                                 as_announcement_sigs
1832                         },
1833                         _ => panic!("Unexpected event"),
1834                 };
1835
1836                 let events_6 = node_a.get_and_clear_pending_events();
1837                 assert_eq!(events_6.len(), 1);
1838                 let (announcement, as_update) = match events_6[0] {
1839                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
1840                                 (msg, update_msg)
1841                         },
1842                         _ => panic!("Unexpected event"),
1843                 };
1844
1845                 node_b.handle_announcement_signatures(&node_a.get_our_node_id(), &as_announcement_sigs).unwrap();
1846                 let events_7 = node_b.get_and_clear_pending_events();
1847                 assert_eq!(events_7.len(), 1);
1848                 let bs_update = match events_7[0] {
1849                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
1850                                 assert!(*announcement == *msg);
1851                                 update_msg
1852                         },
1853                         _ => panic!("Unexpected event"),
1854                 };
1855
1856                 unsafe {
1857                         CHAN_COUNT += 1;
1858                 }
1859
1860                 ((*announcement).clone(), (*as_update).clone(), (*bs_update).clone(), channel_id, tx)
1861         }
1862
1863         fn close_channel(outbound_node: &ChannelManager, outbound_broadcaster: &test_utils::TestBroadcaster, inbound_node: &ChannelManager, inbound_broadcaster: &test_utils::TestBroadcaster, channel_id: &Uint256, funding_tx: Transaction, close_inbound_first: bool) {
1864                 let (node_a, broadcaster_a) = if close_inbound_first { (inbound_node, inbound_broadcaster) } else { (outbound_node, outbound_broadcaster) };
1865                 let (node_b, broadcaster_b) = if close_inbound_first { (outbound_node, outbound_broadcaster) } else { (inbound_node, inbound_broadcaster) };
1866                 let (tx_a, tx_b);
1867
1868                 let shutdown_a = node_a.close_channel(channel_id).unwrap();
1869                 let (shutdown_b, mut closing_signed_b) = node_b.handle_shutdown(&node_a.get_our_node_id(), &shutdown_a).unwrap();
1870                 if !close_inbound_first {
1871                         assert!(closing_signed_b.is_none());
1872                 }
1873                 let (empty_a, mut closing_signed_a) = node_a.handle_shutdown(&node_b.get_our_node_id(), &shutdown_b.unwrap()).unwrap();
1874                 assert!(empty_a.is_none());
1875                 if close_inbound_first {
1876                         assert!(closing_signed_a.is_none());
1877                         closing_signed_a = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
1878                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
1879                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
1880
1881                         let empty_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
1882                         assert!(empty_b.is_none());
1883                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
1884                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
1885                 } else {
1886                         closing_signed_b = node_b.handle_closing_signed(&node_a.get_our_node_id(), &closing_signed_a.unwrap()).unwrap();
1887                         assert_eq!(broadcaster_b.txn_broadcasted.lock().unwrap().len(), 1);
1888                         tx_b = broadcaster_b.txn_broadcasted.lock().unwrap().remove(0);
1889
1890                         let empty_a2 = node_a.handle_closing_signed(&node_b.get_our_node_id(), &closing_signed_b.unwrap()).unwrap();
1891                         assert!(empty_a2.is_none());
1892                         assert_eq!(broadcaster_a.txn_broadcasted.lock().unwrap().len(), 1);
1893                         tx_a = broadcaster_a.txn_broadcasted.lock().unwrap().remove(0);
1894                 }
1895                 assert_eq!(tx_a, tx_b);
1896                 let mut funding_tx_map = HashMap::new();
1897                 funding_tx_map.insert(funding_tx.txid(), funding_tx);
1898                 tx_a.verify(&funding_tx_map).unwrap();
1899         }
1900
1901         struct SendEvent {
1902                 node_id: PublicKey,
1903                 msgs: Vec<msgs::UpdateAddHTLC>,
1904                 commitment_msg: msgs::CommitmentSigned,
1905         }
1906         impl SendEvent {
1907                 fn from_event(event: Event) -> SendEvent {
1908                         match event {
1909                                 Event::SendHTLCs { node_id, msgs, commitment_msg } => {
1910                                         SendEvent { node_id: node_id, msgs: msgs, commitment_msg: commitment_msg }
1911                                 },
1912                                 _ => panic!("Unexpected event type!"),
1913                         }
1914                 }
1915         }
1916
1917         static mut PAYMENT_COUNT: u8 = 0;
1918         fn send_along_route(origin_node: &ChannelManager, origin_monitor: &test_utils::TestChannelMonitor, route: Route, expected_route: &[(&ChannelManager, &test_utils::TestChannelMonitor)], recv_value: u64) -> ([u8; 32], [u8; 32]) {
1919                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
1920                 unsafe { PAYMENT_COUNT += 1 };
1921                 let our_payment_hash = {
1922                         let mut sha = Sha256::new();
1923                         sha.input(&our_payment_preimage[..]);
1924                         let mut ret = [0; 32];
1925                         sha.result(&mut ret);
1926                         ret
1927                 };
1928
1929                 let mut payment_event = {
1930                         let msgs = origin_node.send_payment(route, our_payment_hash).unwrap().unwrap();
1931                         SendEvent {
1932                                 node_id: expected_route[0].0.get_our_node_id(),
1933                                 msgs: vec!(msgs.0),
1934                                 commitment_msg: msgs.1,
1935                         }
1936                 };
1937                 let mut prev_node = (origin_node, origin_monitor);
1938
1939                 for (idx, &(node, monitor)) in expected_route.iter().enumerate() {
1940                         assert_eq!(node.get_our_node_id(), payment_event.node_id);
1941
1942                         node.handle_update_add_htlc(&prev_node.0.get_our_node_id(), &payment_event.msgs[0]).unwrap();
1943                         {
1944                                 let added_monitors = monitor.added_monitors.lock().unwrap();
1945                                 assert_eq!(added_monitors.len(), 0);
1946                         }
1947
1948                         let revoke_and_ack = node.handle_commitment_signed(&prev_node.0.get_our_node_id(), &payment_event.commitment_msg).unwrap();
1949                         {
1950                                 let mut added_monitors = monitor.added_monitors.lock().unwrap();
1951                                 assert_eq!(added_monitors.len(), 1);
1952                                 added_monitors.clear();
1953                         }
1954                         assert!(prev_node.0.handle_revoke_and_ack(&node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
1955                         let prev_revoke_and_ack = prev_node.0.handle_commitment_signed(&node.get_our_node_id(), &revoke_and_ack.1.unwrap()).unwrap();
1956                         {
1957                                 let mut added_monitors = prev_node.1.added_monitors.lock().unwrap();
1958                                 assert_eq!(added_monitors.len(), 2);
1959                                 added_monitors.clear();
1960                         }
1961                         assert!(node.handle_revoke_and_ack(&prev_node.0.get_our_node_id(), &prev_revoke_and_ack.0).unwrap().is_none());
1962                         assert!(prev_revoke_and_ack.1.is_none());
1963                         {
1964                                 let mut added_monitors = monitor.added_monitors.lock().unwrap();
1965                                 assert_eq!(added_monitors.len(), 1);
1966                                 added_monitors.clear();
1967                         }
1968
1969                         let events_1 = node.get_and_clear_pending_events();
1970                         assert_eq!(events_1.len(), 1);
1971                         match events_1[0] {
1972                                 Event::PendingHTLCsForwardable { .. } => { },
1973                                 _ => panic!("Unexpected event"),
1974                         };
1975
1976                         node.channel_state.lock().unwrap().next_forward = Instant::now();
1977                         node.process_pending_htlc_forward();
1978
1979                         let mut events_2 = node.get_and_clear_pending_events();
1980                         assert_eq!(events_2.len(), 1);
1981                         if idx == expected_route.len() - 1 {
1982                                 match events_2[0] {
1983                                         Event::PaymentReceived { ref payment_hash, amt } => {
1984                                                 assert_eq!(our_payment_hash, *payment_hash);
1985                                                 assert_eq!(amt, recv_value);
1986                                         },
1987                                         _ => panic!("Unexpected event"),
1988                                 }
1989                         } else {
1990                                 for event in events_2.drain(..) {
1991                                         payment_event = SendEvent::from_event(event);
1992                                 }
1993                                 assert_eq!(payment_event.msgs.len(), 1);
1994                         }
1995
1996                         prev_node = (node, monitor);
1997                 }
1998
1999                 (our_payment_preimage, our_payment_hash)
2000         }
2001
2002         fn claim_payment(origin_node: &ChannelManager, origin_monitor: &test_utils::TestChannelMonitor, expected_route: &[(&ChannelManager, &test_utils::TestChannelMonitor)], our_payment_preimage: [u8; 32]) {
2003                 assert!(expected_route.last().unwrap().0.claim_funds(our_payment_preimage));
2004                 {
2005                         let mut added_monitors = expected_route.last().unwrap().1.added_monitors.lock().unwrap();
2006                         assert_eq!(added_monitors.len(), 1);
2007                         added_monitors.clear();
2008                 }
2009
2010                 let mut next_msgs: Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)> = None;
2011                 macro_rules! update_fulfill_dance {
2012                         ($node: expr, $monitor: expr, $prev_node: expr, $prev_monitor: expr) => {
2013                                 {
2014                                         $node.handle_update_fulfill_htlc(&$prev_node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2015                                         let revoke_and_commit = $node.handle_commitment_signed(&$prev_node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2016                                         {
2017                                                 let mut added_monitors = $monitor.added_monitors.lock().unwrap();
2018                                                 assert_eq!(added_monitors.len(), 2);
2019                                                 added_monitors.clear();
2020                                         }
2021                                         assert!($prev_node.handle_revoke_and_ack(&$node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2022                                         let revoke_and_ack = $prev_node.handle_commitment_signed(&$node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2023                                         assert!(revoke_and_ack.1.is_none());
2024                                         {
2025                                                 let mut added_monitors = $prev_monitor.added_monitors.lock().unwrap();
2026                                                 assert_eq!(added_monitors.len(), 2);
2027                                                 added_monitors.clear();
2028                                         }
2029                                         assert!($node.handle_revoke_and_ack(&$prev_node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2030                                         {
2031                                                 let mut added_monitors = $monitor.added_monitors.lock().unwrap();
2032                                                 assert_eq!(added_monitors.len(), 1);
2033                                                 added_monitors.clear();
2034                                         }
2035                                 }
2036                         }
2037                 }
2038
2039                 let mut expected_next_node = expected_route.last().unwrap().0.get_our_node_id();
2040                 let mut prev_node = (expected_route.last().unwrap().0, expected_route.last().unwrap().1);
2041                 for &(node, monitor) in expected_route.iter().rev() {
2042                         assert_eq!(expected_next_node, node.get_our_node_id());
2043                         if next_msgs.is_some() {
2044                                 update_fulfill_dance!(node, monitor, prev_node.0, prev_node.1);
2045                         }
2046
2047                         let events = node.get_and_clear_pending_events();
2048                         assert_eq!(events.len(), 1);
2049                         match events[0] {
2050                                 Event::SendFulfillHTLC { ref node_id, ref msg, ref commitment_msg } => {
2051                                         expected_next_node = node_id.clone();
2052                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2053                                 },
2054                                 _ => panic!("Unexpected event"),
2055                         };
2056
2057                         prev_node = (node, monitor);
2058                 }
2059
2060                 assert_eq!(expected_next_node, origin_node.get_our_node_id());
2061                 update_fulfill_dance!(origin_node, origin_monitor, expected_route.first().unwrap().0, expected_route.first().unwrap().1);
2062
2063                 let events = origin_node.get_and_clear_pending_events();
2064                 assert_eq!(events.len(), 1);
2065                 match events[0] {
2066                         Event::PaymentSent { payment_preimage } => {
2067                                 assert_eq!(payment_preimage, our_payment_preimage);
2068                         },
2069                         _ => panic!("Unexpected event"),
2070                 }
2071         }
2072
2073         fn route_payment(origin_node: &ChannelManager, origin_monitor: &test_utils::TestChannelMonitor, origin_router: &Router, expected_route: &[(&ChannelManager, &test_utils::TestChannelMonitor)], recv_value: u64) -> ([u8; 32], [u8; 32]) {
2074                 let route = origin_router.get_route(&expected_route.last().unwrap().0.get_our_node_id(), &Vec::new(), recv_value, 142).unwrap();
2075                 assert_eq!(route.hops.len(), expected_route.len());
2076                 for (&(node, _), hop) in expected_route.iter().zip(route.hops.iter()) {
2077                         assert_eq!(hop.pubkey, node.get_our_node_id());
2078                 }
2079
2080                 send_along_route(origin_node, origin_monitor, route, expected_route, recv_value)
2081         }
2082
2083         fn route_over_limit(origin_node: &ChannelManager, origin_router: &Router, expected_route: &[&ChannelManager], recv_value: u64) {
2084                 let route = origin_router.get_route(&expected_route.last().unwrap().get_our_node_id(), &Vec::new(), recv_value, 142).unwrap();
2085                 assert_eq!(route.hops.len(), expected_route.len());
2086                 for (node, hop) in expected_route.iter().zip(route.hops.iter()) {
2087                         assert_eq!(hop.pubkey, node.get_our_node_id());
2088                 }
2089
2090                 let our_payment_preimage = unsafe { [PAYMENT_COUNT; 32] };
2091                 unsafe { PAYMENT_COUNT += 1 };
2092                 let our_payment_hash = {
2093                         let mut sha = Sha256::new();
2094                         sha.input(&our_payment_preimage[..]);
2095                         let mut ret = [0; 32];
2096                         sha.result(&mut ret);
2097                         ret
2098                 };
2099
2100                 let err = origin_node.send_payment(route, our_payment_hash).err().unwrap();
2101                 assert_eq!(err.err, "Cannot send value that would put us over our max HTLC value in flight");
2102         }
2103
2104         fn send_payment(origin_node: &ChannelManager, origin_monitor: &test_utils::TestChannelMonitor, origin_router: &Router, expected_route: &[(&ChannelManager, &test_utils::TestChannelMonitor)], recv_value: u64) {
2105                 let our_payment_preimage = route_payment(origin_node, origin_monitor, origin_router, expected_route, recv_value).0;
2106                 claim_payment(origin_node, origin_monitor, expected_route, our_payment_preimage);
2107         }
2108
2109         fn send_failed_payment(origin_node: &ChannelManager, origin_monitor: &test_utils::TestChannelMonitor, origin_router: &Router, expected_route: &[(&ChannelManager, &test_utils::TestChannelMonitor)]) {
2110                 let route = origin_router.get_route(&expected_route.last().unwrap().0.get_our_node_id(), &Vec::new(), 1000000, 142).unwrap();
2111                 assert_eq!(route.hops.len(), expected_route.len());
2112                 for (&(node, _), hop) in expected_route.iter().zip(route.hops.iter()) {
2113                         assert_eq!(hop.pubkey, node.get_our_node_id());
2114                 }
2115                 let our_payment_hash = send_along_route(origin_node, origin_monitor, route, expected_route, 1000000).1;
2116
2117                 assert!(expected_route.last().unwrap().0.fail_htlc_backwards(&our_payment_hash));
2118
2119                 let mut next_msgs: Option<(msgs::UpdateFailHTLC, msgs::CommitmentSigned)> = None;
2120                 macro_rules! update_fail_dance {
2121                         ($node: expr, $monitor: expr, $prev_node: expr, $prev_monitor: expr) => {
2122                                 {
2123                                         $node.handle_update_fail_htlc(&$prev_node.get_our_node_id(), &next_msgs.as_ref().unwrap().0).unwrap();
2124                                         let revoke_and_commit = $node.handle_commitment_signed(&$prev_node.get_our_node_id(), &next_msgs.as_ref().unwrap().1).unwrap();
2125                                         {
2126                                                 let mut added_monitors = $monitor.added_monitors.lock().unwrap();
2127                                                 assert_eq!(added_monitors.len(), 1);
2128                                                 added_monitors.clear();
2129                                         }
2130                                         assert!($prev_node.handle_revoke_and_ack(&$node.get_our_node_id(), &revoke_and_commit.0).unwrap().is_none());
2131                                         let revoke_and_ack = $prev_node.handle_commitment_signed(&$node.get_our_node_id(), &revoke_and_commit.1.unwrap()).unwrap();
2132                                         assert!(revoke_and_ack.1.is_none());
2133                                         {
2134                                                 let mut added_monitors = $prev_monitor.added_monitors.lock().unwrap();
2135                                                 assert_eq!(added_monitors.len(), 2);
2136                                                 added_monitors.clear();
2137                                         }
2138                                         assert!($node.handle_revoke_and_ack(&$prev_node.get_our_node_id(), &revoke_and_ack.0).unwrap().is_none());
2139                                         {
2140                                                 let mut added_monitors = $monitor.added_monitors.lock().unwrap();
2141                                                 assert_eq!(added_monitors.len(), 1);
2142                                                 added_monitors.clear();
2143                                         }
2144                                 }
2145                         }
2146                 }
2147
2148                 let mut expected_next_node = expected_route.last().unwrap().0.get_our_node_id();
2149                 let mut prev_node = (expected_route.last().unwrap().0, expected_route.last().unwrap().1);
2150                 for &(node, monitor) in expected_route.iter().rev() {
2151                         assert_eq!(expected_next_node, node.get_our_node_id());
2152                         if next_msgs.is_some() {
2153                                 update_fail_dance!(node, monitor, prev_node.0, prev_node.1);
2154                         }
2155
2156                         let events = node.get_and_clear_pending_events();
2157                         assert_eq!(events.len(), 1);
2158                         match events[0] {
2159                                 Event::SendFailHTLC { ref node_id, ref msg, ref commitment_msg } => {
2160                                         expected_next_node = node_id.clone();
2161                                         next_msgs = Some((msg.clone(), commitment_msg.clone()));
2162                                 },
2163                                 _ => panic!("Unexpected event"),
2164                         };
2165
2166                         prev_node = (node, monitor);
2167                 }
2168
2169                 assert_eq!(expected_next_node, origin_node.get_our_node_id());
2170                 update_fail_dance!(origin_node, origin_monitor, expected_route.first().unwrap().0, expected_route.first().unwrap().1);
2171
2172                 let events = origin_node.get_and_clear_pending_events();
2173                 assert_eq!(events.len(), 1);
2174                 match events[0] {
2175                         Event::PaymentFailed { payment_hash } => {
2176                                 assert_eq!(payment_hash, our_payment_hash);
2177                         },
2178                         _ => panic!("Unexpected event"),
2179                 }
2180         }
2181
2182         #[test]
2183         fn fake_network_test() {
2184                 // Simple test which builds a network of ChannelManagers, connects them to each other, and
2185                 // tests that payments get routed and transactions broadcast in semi-reasonable ways.
2186                 let mut rng = thread_rng();
2187                 let secp_ctx = Secp256k1::new();
2188
2189                 let feeest_1 = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
2190                 let chain_monitor_1 = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
2191                 let tx_broadcaster_1 = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2192                 let chan_monitor_1 = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor_1.clone(), tx_broadcaster_1.clone()));
2193                 let node_id_1 = {
2194                         let mut key_slice = [0; 32];
2195                         rng.fill_bytes(&mut key_slice);
2196                         SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2197                 };
2198                 let node_1 = ChannelManager::new(node_id_1.clone(), 0, true, Network::Testnet, feeest_1.clone(), chan_monitor_1.clone(), chain_monitor_1.clone(), tx_broadcaster_1.clone()).unwrap();
2199                 let router_1 = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id_1).unwrap());
2200
2201                 let feeest_2 = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
2202                 let chain_monitor_2 = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
2203                 let tx_broadcaster_2 = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2204                 let chan_monitor_2 = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor_2.clone(), tx_broadcaster_2.clone()));
2205                 let node_id_2 = {
2206                         let mut key_slice = [0; 32];
2207                         rng.fill_bytes(&mut key_slice);
2208                         SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2209                 };
2210                 let node_2 = ChannelManager::new(node_id_2.clone(), 0, true, Network::Testnet, feeest_2.clone(), chan_monitor_2.clone(), chain_monitor_2.clone(), tx_broadcaster_2.clone()).unwrap();
2211                 let router_2 = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id_2).unwrap());
2212
2213                 let feeest_3 = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
2214                 let chain_monitor_3 = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
2215                 let tx_broadcaster_3 = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2216                 let chan_monitor_3 = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor_3.clone(), tx_broadcaster_3.clone()));
2217                 let node_id_3 = {
2218                         let mut key_slice = [0; 32];
2219                         rng.fill_bytes(&mut key_slice);
2220                         SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2221                 };
2222                 let node_3 = ChannelManager::new(node_id_3.clone(), 0, true, Network::Testnet, feeest_3.clone(), chan_monitor_3.clone(), chain_monitor_3.clone(), tx_broadcaster_3.clone()).unwrap();
2223                 let router_3 = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id_3).unwrap());
2224
2225                 let feeest_4 = Arc::new(test_utils::TestFeeEstimator { sat_per_vbyte: 1 });
2226                 let chain_monitor_4 = Arc::new(chaininterface::ChainWatchInterfaceUtil::new());
2227                 let tx_broadcaster_4 = Arc::new(test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new())});
2228                 let chan_monitor_4 = Arc::new(test_utils::TestChannelMonitor::new(chain_monitor_4.clone(), tx_broadcaster_4.clone()));
2229                 let node_id_4 = {
2230                         let mut key_slice = [0; 32];
2231                         rng.fill_bytes(&mut key_slice);
2232                         SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
2233                 };
2234                 let node_4 = ChannelManager::new(node_id_4.clone(), 0, true, Network::Testnet, feeest_4.clone(), chan_monitor_4.clone(), chain_monitor_4.clone(), tx_broadcaster_4.clone()).unwrap();
2235                 let router_4 = Router::new(PublicKey::from_secret_key(&secp_ctx, &node_id_4).unwrap());
2236
2237                 // Create some initial channels
2238                 let chan_announcement_1 = create_chan_between_nodes(&node_1, &chain_monitor_1, &chan_monitor_1, &node_2, &chain_monitor_2, &chan_monitor_2);
2239                 for router in vec!(&router_1, &router_2, &router_3, &router_4) {
2240                         assert!(router.handle_channel_announcement(&chan_announcement_1.0).unwrap());
2241                         router.handle_channel_update(&chan_announcement_1.1).unwrap();
2242                         router.handle_channel_update(&chan_announcement_1.2).unwrap();
2243                 }
2244                 let chan_announcement_2 = create_chan_between_nodes(&node_2, &chain_monitor_2, &chan_monitor_2, &node_3, &chain_monitor_3, &chan_monitor_3);
2245                 for router in vec!(&router_1, &router_2, &router_3, &router_4) {
2246                         assert!(router.handle_channel_announcement(&chan_announcement_2.0).unwrap());
2247                         router.handle_channel_update(&chan_announcement_2.1).unwrap();
2248                         router.handle_channel_update(&chan_announcement_2.2).unwrap();
2249                 }
2250                 let chan_announcement_3 = create_chan_between_nodes(&node_3, &chain_monitor_3, &chan_monitor_3, &node_4, &chain_monitor_4, &chan_monitor_4);
2251                 for router in vec!(&router_1, &router_2, &router_3, &router_4) {
2252                         assert!(router.handle_channel_announcement(&chan_announcement_3.0).unwrap());
2253                         router.handle_channel_update(&chan_announcement_3.1).unwrap();
2254                         router.handle_channel_update(&chan_announcement_3.2).unwrap();
2255                 }
2256
2257                 // Rebalance the network a bit by relaying one payment through all the channels...
2258                 send_payment(&node_1, &chan_monitor_1, &router_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_3, &*chan_monitor_3), (&*node_4, &*chan_monitor_4))[..], 8000000);
2259                 send_payment(&node_1, &chan_monitor_1, &router_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_3, &*chan_monitor_3), (&*node_4, &*chan_monitor_4))[..], 8000000);
2260                 send_payment(&node_1, &chan_monitor_1, &router_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_3, &*chan_monitor_3), (&*node_4, &*chan_monitor_4))[..], 8000000);
2261                 send_payment(&node_1, &chan_monitor_1, &router_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_3, &*chan_monitor_3), (&*node_4, &*chan_monitor_4))[..], 8000000);
2262                 send_payment(&node_1, &chan_monitor_1, &router_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_3, &*chan_monitor_3), (&*node_4, &*chan_monitor_4))[..], 8000000);
2263
2264                 // Send some more payments
2265                 send_payment(&node_2, &chan_monitor_2, &router_2, &vec!((&*node_3, &*chan_monitor_3), (&*node_4, &*chan_monitor_4))[..], 1000000);
2266                 send_payment(&node_4, &chan_monitor_4, &router_4, &vec!((&*node_3, &*chan_monitor_3), (&*node_2, &*chan_monitor_2), (&*node_1, &*chan_monitor_1))[..], 1000000);
2267                 send_payment(&node_4, &chan_monitor_4, &router_4, &vec!((&*node_3, &*chan_monitor_3), (&*node_2, &*chan_monitor_2))[..], 1000000);
2268
2269                 // Test failure packets
2270                 send_failed_payment(&node_1, &chan_monitor_1, &router_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_3, &*chan_monitor_3), (&*node_4, &*chan_monitor_4))[..]);
2271
2272                 // Add a new channel that skips 3
2273                 let chan_announcement_4 = create_chan_between_nodes(&node_2, &chain_monitor_2, &chan_monitor_2, &node_4, &chain_monitor_4, &chan_monitor_4);
2274                 for router in vec!(&router_1, &router_2, &router_3, &router_4) {
2275                         assert!(router.handle_channel_announcement(&chan_announcement_4.0).unwrap());
2276                         router.handle_channel_update(&chan_announcement_4.1).unwrap();
2277                         router.handle_channel_update(&chan_announcement_4.2).unwrap();
2278                 }
2279
2280                 send_payment(&node_1, &chan_monitor_1, &router_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_4, &*chan_monitor_4))[..], 1000000);
2281                 send_payment(&node_3, &chan_monitor_3, &router_3, &vec!((&*node_4, &*chan_monitor_4))[..], 1000000);
2282                 send_payment(&node_2, &chan_monitor_2, &router_2, &vec!((&*node_4, &*chan_monitor_4))[..], 8000000);
2283                 send_payment(&node_2, &chan_monitor_2, &router_2, &vec!((&*node_4, &*chan_monitor_4))[..], 8000000);
2284                 send_payment(&node_2, &chan_monitor_2, &router_2, &vec!((&*node_4, &*chan_monitor_4))[..], 8000000);
2285                 send_payment(&node_2, &chan_monitor_2, &router_2, &vec!((&*node_4, &*chan_monitor_4))[..], 8000000);
2286                 send_payment(&node_2, &chan_monitor_2, &router_2, &vec!((&*node_4, &*chan_monitor_4))[..], 8000000);
2287
2288                 // Do some rebalance loop payments, simultaneously
2289                 let mut hops = Vec::with_capacity(3);
2290                 hops.push(RouteHop {
2291                         pubkey: node_3.get_our_node_id(),
2292                         short_channel_id: chan_announcement_2.1.contents.short_channel_id,
2293                         fee_msat: 0,
2294                         cltv_expiry_delta: chan_announcement_3.1.contents.cltv_expiry_delta as u32
2295                 });
2296                 hops.push(RouteHop {
2297                         pubkey: node_4.get_our_node_id(),
2298                         short_channel_id: chan_announcement_3.1.contents.short_channel_id,
2299                         fee_msat: 0,
2300                         cltv_expiry_delta: chan_announcement_4.2.contents.cltv_expiry_delta as u32
2301                 });
2302                 hops.push(RouteHop {
2303                         pubkey: node_2.get_our_node_id(),
2304                         short_channel_id: chan_announcement_4.1.contents.short_channel_id,
2305                         fee_msat: 1000000,
2306                         cltv_expiry_delta: 142,
2307                 });
2308                 hops[1].fee_msat = chan_announcement_4.2.contents.fee_base_msat as u64 + chan_announcement_4.2.contents.fee_proportional_millionths as u64 * hops[2].fee_msat as u64 / 1000000;
2309                 hops[0].fee_msat = chan_announcement_3.1.contents.fee_base_msat as u64 + chan_announcement_3.1.contents.fee_proportional_millionths as u64 * hops[1].fee_msat as u64 / 1000000;
2310                 let payment_preimage_1 = send_along_route(&node_2, &chan_monitor_2, Route { hops }, &vec!((&*node_3, &*chan_monitor_3), (&*node_4, &*chan_monitor_4), (&*node_2, &*chan_monitor_2))[..], 1000000).0;
2311
2312                 let mut hops = Vec::with_capacity(3);
2313                 hops.push(RouteHop {
2314                         pubkey: node_4.get_our_node_id(),
2315                         short_channel_id: chan_announcement_4.1.contents.short_channel_id,
2316                         fee_msat: 0,
2317                         cltv_expiry_delta: chan_announcement_3.2.contents.cltv_expiry_delta as u32
2318                 });
2319                 hops.push(RouteHop {
2320                         pubkey: node_3.get_our_node_id(),
2321                         short_channel_id: chan_announcement_3.1.contents.short_channel_id,
2322                         fee_msat: 0,
2323                         cltv_expiry_delta: chan_announcement_2.2.contents.cltv_expiry_delta as u32
2324                 });
2325                 hops.push(RouteHop {
2326                         pubkey: node_2.get_our_node_id(),
2327                         short_channel_id: chan_announcement_2.1.contents.short_channel_id,
2328                         fee_msat: 1000000,
2329                         cltv_expiry_delta: 142,
2330                 });
2331                 hops[1].fee_msat = chan_announcement_2.2.contents.fee_base_msat as u64 + chan_announcement_2.2.contents.fee_proportional_millionths as u64 * hops[2].fee_msat as u64 / 1000000;
2332                 hops[0].fee_msat = chan_announcement_3.2.contents.fee_base_msat as u64 + chan_announcement_3.2.contents.fee_proportional_millionths as u64 * hops[1].fee_msat as u64 / 1000000;
2333                 let payment_preimage_2 = send_along_route(&node_2, &chan_monitor_2, Route { hops }, &vec!((&*node_4, &*chan_monitor_4), (&*node_3, &*chan_monitor_3), (&*node_2, &*chan_monitor_2))[..], 1000000).0;
2334
2335                 // Claim the rebalances...
2336                 claim_payment(&node_2, &chan_monitor_2, &vec!((&*node_4, &*chan_monitor_4), (&*node_3, &*chan_monitor_3), (&*node_2, &*chan_monitor_2))[..], payment_preimage_2);
2337                 claim_payment(&node_2, &chan_monitor_2, &vec!((&*node_3, &*chan_monitor_3), (&*node_4, &*chan_monitor_4), (&*node_2, &*chan_monitor_2))[..], payment_preimage_1);
2338
2339                 // Add a duplicate new channel from 2 to 4
2340                 let chan_announcement_5 = create_chan_between_nodes(&node_2, &chain_monitor_2, &chan_monitor_2, &node_4, &chain_monitor_4, &chan_monitor_4);
2341                 for router in vec!(&router_1, &router_2, &router_3, &router_4) {
2342                         assert!(router.handle_channel_announcement(&chan_announcement_5.0).unwrap());
2343                         router.handle_channel_update(&chan_announcement_5.1).unwrap();
2344                         router.handle_channel_update(&chan_announcement_5.2).unwrap();
2345                 }
2346
2347                 // Send some payments across both channels
2348                 let payment_preimage_3 = route_payment(&node_1, &chan_monitor_1, &router_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_4, &*chan_monitor_4))[..], 3000000).0;
2349                 let payment_preimage_4 = route_payment(&node_1, &chan_monitor_1, &router_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_4, &*chan_monitor_4))[..], 3000000).0;
2350                 let payment_preimage_5 = route_payment(&node_1, &chan_monitor_1, &router_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_4, &*chan_monitor_4))[..], 3000000).0;
2351
2352                 route_over_limit(&node_1, &router_1, &vec!(&*node_2, &*node_4)[..], 3000000);
2353
2354                 //TODO: Test that routes work again here as we've been notified that the channel is full
2355
2356                 claim_payment(&node_1, &chan_monitor_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_4, &*chan_monitor_4))[..], payment_preimage_3);
2357                 claim_payment(&node_1, &chan_monitor_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_4, &*chan_monitor_4))[..], payment_preimage_4);
2358                 claim_payment(&node_1, &chan_monitor_1, &vec!((&*node_2, &*chan_monitor_2), (&*node_4, &*chan_monitor_4))[..], payment_preimage_5);
2359
2360                 // Close down the channels...
2361                 close_channel(&node_1, &tx_broadcaster_1, &node_2, &tx_broadcaster_2, &chan_announcement_1.3, chan_announcement_1.4, true);
2362                 close_channel(&node_2, &tx_broadcaster_2, &node_3, &tx_broadcaster_3, &chan_announcement_2.3, chan_announcement_2.4, false);
2363                 close_channel(&node_3, &tx_broadcaster_3, &node_4, &tx_broadcaster_4, &chan_announcement_3.3, chan_announcement_3.4, true);
2364                 close_channel(&node_2, &tx_broadcaster_2, &node_4, &tx_broadcaster_4, &chan_announcement_4.3, chan_announcement_4.4, false);
2365
2366                 // Check that we processed all pending events
2367                 for node in vec!(&node_1, &node_2, &node_3, &node_4) {
2368                         assert_eq!(node.get_and_clear_pending_events().len(), 0);
2369                 }
2370                 for chan_monitor in vec!(&chan_monitor_1, &chan_monitor_2, &chan_monitor_3, &chan_monitor_4) {
2371                         assert_eq!(chan_monitor.added_monitors.lock().unwrap().len(), 0);
2372                 }
2373         }
2374 }