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

   1 use bitcoin::blockdata::block::BlockHeader;
   2 use bitcoin::blockdata::script::{Script,Builder};
   3 use bitcoin::blockdata::transaction::{TxIn, TxOut, Transaction, SigHashType};
   4 use bitcoin::blockdata::opcodes;
   5 use bitcoin::util::hash::BitcoinHash;
   6 use bitcoin::util::bip143;
   7 use bitcoin::consensus::encode;
   8
   9 use bitcoin_hashes::{Hash, HashEngine};
  10 use bitcoin_hashes::sha256::Hash as Sha256;
  11 use bitcoin_hashes::hash160::Hash as Hash160;
  12 use bitcoin_hashes::sha256d::Hash as Sha256dHash;
  13
  14 use secp256k1::key::{PublicKey,SecretKey};
  15 use secp256k1::{Secp256k1,Signature};
  16 use secp256k1;
  17
  18 use ln::features::{ChannelFeatures, InitFeatures};
  19 use ln::msgs;
  20 use ln::msgs::{DecodeError, OptionalField, DataLossProtect};
  21 use ln::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateStep};
  22 use ln::channelmanager::{PendingHTLCStatus, HTLCSource, HTLCFailReason, HTLCFailureMsg, PendingHTLCInfo, RAACommitmentOrder, PaymentPreimage, PaymentHash, BREAKDOWN_TIMEOUT, MAX_LOCAL_BREAKDOWN_TIMEOUT};
  23 use ln::chan_utils::{CounterpartyCommitmentSecrets, LocalCommitmentTransaction, TxCreationKeys, HTLCOutputInCommitment, HTLC_SUCCESS_TX_WEIGHT, HTLC_TIMEOUT_TX_WEIGHT, make_funding_redeemscript, ChannelPublicKeys};
  24 use ln::chan_utils;
  25 use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
  26 use chain::transaction::OutPoint;
  27 use chain::keysinterface::{ChannelKeys, KeysInterface};
  28 use util::transaction_utils;
  29 use util::ser::{Readable, ReadableArgs, Writeable, Writer};
  30 use util::logger::{Logger, LogHolder};
  31 use util::errors::APIError;
  32 use util::config::{UserConfig,ChannelConfig};
  33
  34 use std;
  35 use std::default::Default;
  36 use std::{cmp,mem,fmt};
  37 use std::sync::{Arc};
  38 use std::ops::Deref;
  39
  40 #[cfg(test)]
  41 pub struct ChannelValueStat {
  42         pub value_to_self_msat: u64,
  43         pub channel_value_msat: u64,
  44         pub channel_reserve_msat: u64,
  45         pub pending_outbound_htlcs_amount_msat: u64,
  46         pub pending_inbound_htlcs_amount_msat: u64,
  47         pub holding_cell_outbound_amount_msat: u64,
  48         pub their_max_htlc_value_in_flight_msat: u64, // outgoing
  49 }
  50
  51 enum InboundHTLCRemovalReason {
  52         FailRelay(msgs::OnionErrorPacket),
  53         FailMalformed(([u8; 32], u16)),
  54         Fulfill(PaymentPreimage),
  55 }
  56
  57 enum InboundHTLCState {
  58         /// Added by remote, to be included in next local commitment tx.
  59         RemoteAnnounced(PendingHTLCStatus),
  60         /// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
  61         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
  62         /// accept this HTLC. Implies AwaitingRemoteRevoke.
  63         /// We also have not yet included this HTLC in a commitment_signed message, and are waiting on
  64         /// a remote revoke_and_ack on a previous state before we can do so.
  65         AwaitingRemoteRevokeToAnnounce(PendingHTLCStatus),
  66         /// Included in a received commitment_signed message (implying we've revoke_and_ack'ed it), but
  67         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
  68         /// accept this HTLC. Implies AwaitingRemoteRevoke.
  69         /// We have included this HTLC in our latest commitment_signed and are now just waiting on a
  70         /// revoke_and_ack.
  71         AwaitingAnnouncedRemoteRevoke(PendingHTLCStatus),
  72         Committed,
  73         /// Removed by us and a new commitment_signed was sent (if we were AwaitingRemoteRevoke when we
  74         /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
  75         /// we'll drop it.
  76         /// Note that we have to keep an eye on the HTLC until we've received a broadcastable
  77         /// commitment transaction without it as otherwise we'll have to force-close the channel to
  78         /// claim it before the timeout (obviously doesn't apply to revoked HTLCs that we can't claim
  79         /// anyway). That said, ChannelMonitor does this for us (see
  80         /// ChannelMonitor::would_broadcast_at_height) so we actually remove the HTLC from our own
  81         /// local state before then, once we're sure that the next commitment_signed and
  82         /// ChannelMonitor::provide_latest_local_commitment_tx_info will not include this HTLC.
  83         LocalRemoved(InboundHTLCRemovalReason),
  84 }
  85
  86 struct InboundHTLCOutput {
  87         htlc_id: u64,
  88         amount_msat: u64,
  89         cltv_expiry: u32,
  90         payment_hash: PaymentHash,
  91         state: InboundHTLCState,
  92 }
  93
  94 enum OutboundHTLCState {
  95         /// Added by us and included in a commitment_signed (if we were AwaitingRemoteRevoke when we
  96         /// created it we would have put it in the holding cell instead). When they next revoke_and_ack
  97         /// we will promote to Committed (note that they may not accept it until the next time we
  98         /// revoke, but we don't really care about that:
  99         ///  * they've revoked, so worst case we can announce an old state and get our (option on)
 100         ///    money back (though we won't), and,
 101         ///  * we'll send them a revoke when they send a commitment_signed, and since only they're
 102         ///    allowed to remove it, the "can only be removed once committed on both sides" requirement
 103         ///    doesn't matter to us and it's up to them to enforce it, worst-case they jump ahead but
 104         ///    we'll never get out of sync).
 105         /// Note that we Box the OnionPacket as it's rather large and we don't want to blow up
 106         /// OutboundHTLCOutput's size just for a temporary bit
 107         LocalAnnounced(Box<msgs::OnionPacket>),
 108         Committed,
 109         /// Remote removed this (outbound) HTLC. We're waiting on their commitment_signed to finalize
 110         /// the change (though they'll need to revoke before we fail the payment).
 111         RemoteRemoved(Option<HTLCFailReason>),
 112         /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
 113         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
 114         /// can do any backwards failing. Implies AwaitingRemoteRevoke.
 115         /// We also have not yet removed this HTLC in a commitment_signed message, and are waiting on a
 116         /// remote revoke_and_ack on a previous state before we can do so.
 117         AwaitingRemoteRevokeToRemove(Option<HTLCFailReason>),
 118         /// Remote removed this and sent a commitment_signed (implying we've revoke_and_ack'ed it), but
 119         /// the remote side hasn't yet revoked their previous state, which we need them to do before we
 120         /// can do any backwards failing. Implies AwaitingRemoteRevoke.
 121         /// We have removed this HTLC in our latest commitment_signed and are now just waiting on a
 122         /// revoke_and_ack to drop completely.
 123         AwaitingRemovedRemoteRevoke(Option<HTLCFailReason>),
 124 }
 125
 126 struct OutboundHTLCOutput {
 127         htlc_id: u64,
 128         amount_msat: u64,
 129         cltv_expiry: u32,
 130         payment_hash: PaymentHash,
 131         state: OutboundHTLCState,
 132         source: HTLCSource,
 133 }
 134
 135 /// See AwaitingRemoteRevoke ChannelState for more info
 136 enum HTLCUpdateAwaitingACK {
 137         AddHTLC { // TODO: Time out if we're getting close to cltv_expiry
 138                 // always outbound
 139                 amount_msat: u64,
 140                 cltv_expiry: u32,
 141                 payment_hash: PaymentHash,
 142                 source: HTLCSource,
 143                 onion_routing_packet: msgs::OnionPacket,
 144         },
 145         ClaimHTLC {
 146                 payment_preimage: PaymentPreimage,
 147                 htlc_id: u64,
 148         },
 149         FailHTLC {
 150                 htlc_id: u64,
 151                 err_packet: msgs::OnionErrorPacket,
 152         },
 153 }
 154
 155 /// There are a few "states" and then a number of flags which can be applied:
 156 /// We first move through init with OurInitSent -> TheirInitSent -> FundingCreated -> FundingSent.
 157 /// TheirFundingLocked and OurFundingLocked then get set on FundingSent, and when both are set we
 158 /// move on to ChannelFunded.
 159 /// Note that PeerDisconnected can be set on both ChannelFunded and FundingSent.
 160 /// ChannelFunded can then get all remaining flags set on it, until we finish shutdown, then we
 161 /// move on to ShutdownComplete, at which point most calls into this channel are disallowed.
 162 enum ChannelState {
 163         /// Implies we have (or are prepared to) send our open_channel/accept_channel message
 164         OurInitSent = (1 << 0),
 165         /// Implies we have received their open_channel/accept_channel message
 166         TheirInitSent = (1 << 1),
 167         /// We have sent funding_created and are awaiting a funding_signed to advance to FundingSent.
 168         /// Note that this is nonsense for an inbound channel as we immediately generate funding_signed
 169         /// upon receipt of funding_created, so simply skip this state.
 170         FundingCreated = 4,
 171         /// Set when we have received/sent funding_created and funding_signed and are thus now waiting
 172         /// on the funding transaction to confirm. The FundingLocked flags are set to indicate when we
 173         /// and our counterparty consider the funding transaction confirmed.
 174         FundingSent = 8,
 175         /// Flag which can be set on FundingSent to indicate they sent us a funding_locked message.
 176         /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
 177         TheirFundingLocked = (1 << 4),
 178         /// Flag which can be set on FundingSent to indicate we sent them a funding_locked message.
 179         /// Once both TheirFundingLocked and OurFundingLocked are set, state moves on to ChannelFunded.
 180         OurFundingLocked = (1 << 5),
 181         ChannelFunded = 64,
 182         /// Flag which is set on ChannelFunded and FundingSent indicating remote side is considered
 183         /// "disconnected" and no updates are allowed until after we've done a channel_reestablish
 184         /// dance.
 185         PeerDisconnected = (1 << 7),
 186         /// Flag which is set on ChannelFunded, FundingCreated, and FundingSent indicating the user has
 187         /// told us they failed to update our ChannelMonitor somewhere and we should pause sending any
 188         /// outbound messages until they've managed to do so.
 189         MonitorUpdateFailed = (1 << 8),
 190         /// Flag which implies that we have sent a commitment_signed but are awaiting the responding
 191         /// revoke_and_ack message. During this time period, we can't generate new commitment_signed
 192         /// messages as then we will be unable to determine which HTLCs they included in their
 193         /// revoke_and_ack implicit ACK, so instead we have to hold them away temporarily to be sent
 194         /// later.
 195         /// Flag is set on ChannelFunded.
 196         AwaitingRemoteRevoke = (1 << 9),
 197         /// Flag which is set on ChannelFunded or FundingSent after receiving a shutdown message from
 198         /// the remote end. If set, they may not add any new HTLCs to the channel, and we are expected
 199         /// to respond with our own shutdown message when possible.
 200         RemoteShutdownSent = (1 << 10),
 201         /// Flag which is set on ChannelFunded or FundingSent after sending a shutdown message. At this
 202         /// point, we may not add any new HTLCs to the channel.
 203         /// TODO: Investigate some kind of timeout mechanism by which point the remote end must provide
 204         /// us their shutdown.
 205         LocalShutdownSent = (1 << 11),
 206         /// We've successfully negotiated a closing_signed dance. At this point ChannelManager is about
 207         /// to drop us, but we store this anyway.
 208         ShutdownComplete = 4096,
 209 }
 210 const BOTH_SIDES_SHUTDOWN_MASK: u32 = (ChannelState::LocalShutdownSent as u32 | ChannelState::RemoteShutdownSent as u32);
 211 const MULTI_STATE_FLAGS: u32 = (BOTH_SIDES_SHUTDOWN_MASK | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32);
 212
 213 const INITIAL_COMMITMENT_NUMBER: u64 = (1 << 48) - 1;
 214
 215 /// Liveness is called to fluctuate given peer disconnecton/monitor failures/closing.
 216 /// If channel is public, network should have a liveness view announced by us on a
 217 /// best-effort, which means we may filter out some status transitions to avoid spam.
 218 /// See further timer_chan_freshness_every_min.
 219 #[derive(PartialEq)]
 220 enum UpdateStatus {
 221         /// Status has been gossiped.
 222         Fresh,
 223         /// Status has been changed.
 224         DisabledMarked,
 225         /// Status has been marked to be gossiped at next flush
 226         DisabledStaged,
 227 }
 228
 229 // TODO: We should refactor this to be an Inbound/OutboundChannel until initial setup handshaking
 230 // has been completed, and then turn into a Channel to get compiler-time enforcement of things like
 231 // calling channel_id() before we're set up or things like get_outbound_funding_signed on an
 232 // inbound channel.
 233 pub(super) struct Channel<ChanSigner: ChannelKeys> {
 234         config: ChannelConfig,
 235
 236         user_id: u64,
 237
 238         channel_id: [u8; 32],
 239         channel_state: u32,
 240         channel_outbound: bool,
 241         secp_ctx: Secp256k1<secp256k1::All>,
 242         channel_value_satoshis: u64,
 243
 244         latest_monitor_update_id: u64,
 245
 246         #[cfg(not(test))]
 247         local_keys: ChanSigner,
 248         #[cfg(test)]
 249         pub(super) local_keys: ChanSigner,
 250         shutdown_pubkey: PublicKey,
 251         destination_script: Script,
 252
 253         // Our commitment numbers start at 2^48-1 and count down, whereas the ones used in transaction
 254         // generation start at 0 and count up...this simplifies some parts of implementation at the
 255         // cost of others, but should really just be changed.
 256
 257         cur_local_commitment_transaction_number: u64,
 258         cur_remote_commitment_transaction_number: u64,
 259         value_to_self_msat: u64, // Excluding all pending_htlcs, excluding fees
 260         pending_inbound_htlcs: Vec<InboundHTLCOutput>,
 261         pending_outbound_htlcs: Vec<OutboundHTLCOutput>,
 262         holding_cell_htlc_updates: Vec<HTLCUpdateAwaitingACK>,
 263
 264         /// When resending CS/RAA messages on channel monitor restoration or on reconnect, we always
 265         /// need to ensure we resend them in the order we originally generated them. Note that because
 266         /// there can only ever be one in-flight CS and/or one in-flight RAA at any time, it is
 267         /// sufficient to simply set this to the opposite of any message we are generating as we
 268         /// generate it. ie when we generate a CS, we set this to RAAFirst as, if there is a pending
 269         /// in-flight RAA to resend, it will have been the first thing we generated, and thus we should
 270         /// send it first.
 271         resend_order: RAACommitmentOrder,
 272
 273         monitor_pending_funding_locked: bool,
 274         monitor_pending_revoke_and_ack: bool,
 275         monitor_pending_commitment_signed: bool,
 276         monitor_pending_forwards: Vec<(PendingHTLCInfo, u64)>,
 277         monitor_pending_failures: Vec<(HTLCSource, PaymentHash, HTLCFailReason)>,
 278
 279         // pending_update_fee is filled when sending and receiving update_fee
 280         // For outbound channel, feerate_per_kw is updated with the value from
 281         // pending_update_fee when revoke_and_ack is received
 282         //
 283         // For inbound channel, feerate_per_kw is updated when it receives
 284         // commitment_signed and revoke_and_ack is generated
 285         // The pending value is kept when another pair of update_fee and commitment_signed
 286         // is received during AwaitingRemoteRevoke and relieved when the expected
 287         // revoke_and_ack is received and new commitment_signed is generated to be
 288         // sent to the funder. Otherwise, the pending value is removed when receiving
 289         // commitment_signed.
 290         pending_update_fee: Option<u64>,
 291         // update_fee() during ChannelState::AwaitingRemoteRevoke is hold in
 292         // holdina_cell_update_fee then moved to pending_udpate_fee when revoke_and_ack
 293         // is received. holding_cell_update_fee is updated when there are additional
 294         // update_fee() during ChannelState::AwaitingRemoteRevoke.
 295         holding_cell_update_fee: Option<u64>,
 296         next_local_htlc_id: u64,
 297         next_remote_htlc_id: u64,
 298         update_time_counter: u32,
 299         feerate_per_kw: u64,
 300
 301         #[cfg(debug_assertions)]
 302         /// Max to_local and to_remote outputs in a locally-generated commitment transaction
 303         max_commitment_tx_output_local: ::std::sync::Mutex<(u64, u64)>,
 304         #[cfg(debug_assertions)]
 305         /// Max to_local and to_remote outputs in a remote-generated commitment transaction
 306         max_commitment_tx_output_remote: ::std::sync::Mutex<(u64, u64)>,
 307
 308         last_sent_closing_fee: Option<(u64, u64, Signature)>, // (feerate, fee, our_sig)
 309
 310         funding_txo: Option<OutPoint>,
 311
 312         /// The hash of the block in which the funding transaction reached our CONF_TARGET. We use this
 313         /// to detect unconfirmation after a serialize-unserialize roundtrip where we may not see a full
 314         /// series of block_connected/block_disconnected calls. Obviously this is not a guarantee as we
 315         /// could miss the funding_tx_confirmed_in block as well, but it serves as a useful fallback.
 316         funding_tx_confirmed_in: Option<Sha256dHash>,
 317         short_channel_id: Option<u64>,
 318         /// Used to deduplicate block_connected callbacks, also used to verify consistency during
 319         /// ChannelManager deserialization (hence pub(super))
 320         pub(super) last_block_connected: Sha256dHash,
 321         funding_tx_confirmations: u64,
 322
 323         their_dust_limit_satoshis: u64,
 324         #[cfg(test)]
 325         pub(super) our_dust_limit_satoshis: u64,
 326         #[cfg(not(test))]
 327         our_dust_limit_satoshis: u64,
 328         #[cfg(test)]
 329         pub(super) their_max_htlc_value_in_flight_msat: u64,
 330         #[cfg(not(test))]
 331         their_max_htlc_value_in_flight_msat: u64,
 332         //get_our_max_htlc_value_in_flight_msat(): u64,
 333         /// minimum channel reserve for **self** to maintain - set by them.
 334         their_channel_reserve_satoshis: u64,
 335         //get_our_channel_reserve_satoshis(): u64,
 336         their_htlc_minimum_msat: u64,
 337         our_htlc_minimum_msat: u64,
 338         their_to_self_delay: u16,
 339         our_to_self_delay: u16,
 340         #[cfg(test)]
 341         pub their_max_accepted_htlcs: u16,
 342         #[cfg(not(test))]
 343         their_max_accepted_htlcs: u16,
 344         //implied by OUR_MAX_HTLCS: our_max_accepted_htlcs: u16,
 345         minimum_depth: u32,
 346
 347         their_pubkeys: Option<ChannelPublicKeys>,
 348
 349         their_cur_commitment_point: Option<PublicKey>,
 350
 351         their_prev_commitment_point: Option<PublicKey>,
 352         their_node_id: PublicKey,
 353
 354         their_shutdown_scriptpubkey: Option<Script>,
 355
 356         /// Used exclusively to broadcast the latest local state, mostly a historical quirk that this
 357         /// is here:
 358         channel_monitor: Option<ChannelMonitor<ChanSigner>>,
 359         commitment_secrets: CounterpartyCommitmentSecrets,
 360
 361         network_sync: UpdateStatus,
 362
 363         logger: Arc<Logger>,
 364 }
 365
 366 pub const OUR_MAX_HTLCS: u16 = 50; //TODO
 367 /// Confirmation count threshold at which we close a channel. Ideally we'd keep the channel around
 368 /// on ice until the funding transaction gets more confirmations, but the LN protocol doesn't
 369 /// really allow for this, so instead we're stuck closing it out at that point.
 370 const UNCONF_THRESHOLD: u32 = 6;
 371 const SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT: u64 = 79; // prevout: 36, nSequence: 4, script len: 1, witness lengths: (3+1)/4, sig: 73/4, if-selector: 1, redeemScript: (6 ops + 2*33 pubkeys + 1*2 delay)/4
 372 const B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT: u64 = 104; // prevout: 40, nSequence: 4, script len: 1, witness lengths: 3/4, sig: 73/4, pubkey: 33/4, output: 31 (TODO: Wrong? Useless?)
 373
 374 #[cfg(not(test))]
 375 const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
 376 #[cfg(test)]
 377 pub const COMMITMENT_TX_BASE_WEIGHT: u64 = 724;
 378 #[cfg(not(test))]
 379 const COMMITMENT_TX_WEIGHT_PER_HTLC: u64 = 172;
 380 #[cfg(test)]
 381 pub const COMMITMENT_TX_WEIGHT_PER_HTLC: u64 = 172;
 382
 383 /// Maximmum `funding_satoshis` value, according to the BOLT #2 specification
 384 /// it's 2^24.
 385 pub const MAX_FUNDING_SATOSHIS: u64 = (1 << 24);
 386
 387 /// Used to return a simple Error back to ChannelManager. Will get converted to a
 388 /// msgs::ErrorAction::SendErrorMessage or msgs::ErrorAction::IgnoreError as appropriate with our
 389 /// channel_id in ChannelManager.
 390 pub(super) enum ChannelError {
 391         Ignore(&'static str),
 392         Close(&'static str),
 393         CloseDelayBroadcast {
 394                 msg: &'static str,
 395                 update: ChannelMonitorUpdate,
 396         },
 397 }
 398
 399 impl fmt::Debug for ChannelError {
 400         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 401                 match self {
 402                         &ChannelError::Ignore(e) => write!(f, "Ignore : {}", e),
 403                         &ChannelError::Close(e) => write!(f, "Close : {}", e),
 404                         &ChannelError::CloseDelayBroadcast { msg, .. } => write!(f, "CloseDelayBroadcast : {}", msg)
 405                 }
 406         }
 407 }
 408
 409 macro_rules! secp_check {
 410         ($res: expr, $err: expr) => {
 411                 match $res {
 412                         Ok(thing) => thing,
 413                         Err(_) => return Err(ChannelError::Close($err)),
 414                 }
 415         };
 416 }
 417
 418 impl<ChanSigner: ChannelKeys> Channel<ChanSigner> {
 419         // Convert constants + channel value to limits:
 420         fn get_our_max_htlc_value_in_flight_msat(channel_value_satoshis: u64) -> u64 {
 421                 channel_value_satoshis * 1000 / 10 //TODO
 422         }
 423
 424         /// Returns a minimum channel reserve value **they** need to maintain
 425         ///
 426         /// Guaranteed to return a value no larger than channel_value_satoshis
 427         pub(crate) fn get_our_channel_reserve_satoshis(channel_value_satoshis: u64) -> u64 {
 428                 let (q, _) = channel_value_satoshis.overflowing_div(100);
 429                 cmp::min(channel_value_satoshis, cmp::max(q, 1000)) //TODO
 430         }
 431
 432         fn derive_our_dust_limit_satoshis(at_open_background_feerate: u64) -> u64 {
 433                 cmp::max(at_open_background_feerate * B_OUTPUT_PLUS_SPENDING_INPUT_WEIGHT / 1000, 546) //TODO
 434         }
 435
 436         // Constructors:
 437         pub fn new_outbound<K: Deref, F: Deref>(fee_estimator: &F, keys_provider: &K, their_node_id: PublicKey, channel_value_satoshis: u64, push_msat: u64, user_id: u64, logger: Arc<Logger>, config: &UserConfig) -> Result<Channel<ChanSigner>, APIError>
 438         where K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
 439               F::Target: FeeEstimator,
 440         {
 441                 let chan_keys = keys_provider.get_channel_keys(false, channel_value_satoshis);
 442
 443                 if channel_value_satoshis >= MAX_FUNDING_SATOSHIS {
 444                         return Err(APIError::APIMisuseError{err: "funding value > 2^24"});
 445                 }
 446
 447                 if push_msat > channel_value_satoshis * 1000 {
 448                         return Err(APIError::APIMisuseError{err: "push value > channel value"});
 449                 }
 450                 if config.own_channel_config.our_to_self_delay < BREAKDOWN_TIMEOUT {
 451                         return Err(APIError::APIMisuseError{err: "Configured with an unreasonable our_to_self_delay putting user funds at risks"});
 452                 }
 453
 454
 455                 let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
 456                 if Channel::<ChanSigner>::get_our_channel_reserve_satoshis(channel_value_satoshis) < Channel::<ChanSigner>::derive_our_dust_limit_satoshis(background_feerate) {
 457                         return Err(APIError::FeeRateTooHigh{err: format!("Not enough reserve above dust limit can be found at current fee rate({})", background_feerate), feerate: background_feerate});
 458                 }
 459
 460                 let feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 461
 462                 Ok(Channel {
 463                         user_id: user_id,
 464                         config: config.channel_options.clone(),
 465
 466                         channel_id: keys_provider.get_channel_id(),
 467                         channel_state: ChannelState::OurInitSent as u32,
 468                         channel_outbound: true,
 469                         secp_ctx: Secp256k1::new(),
 470                         channel_value_satoshis: channel_value_satoshis,
 471
 472                         latest_monitor_update_id: 0,
 473
 474                         local_keys: chan_keys,
 475                         shutdown_pubkey: keys_provider.get_shutdown_pubkey(),
 476                         destination_script: keys_provider.get_destination_script(),
 477
 478                         cur_local_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
 479                         cur_remote_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
 480                         value_to_self_msat: channel_value_satoshis * 1000 - push_msat,
 481
 482                         pending_inbound_htlcs: Vec::new(),
 483                         pending_outbound_htlcs: Vec::new(),
 484                         holding_cell_htlc_updates: Vec::new(),
 485                         pending_update_fee: None,
 486                         holding_cell_update_fee: None,
 487                         next_local_htlc_id: 0,
 488                         next_remote_htlc_id: 0,
 489                         update_time_counter: 1,
 490
 491                         resend_order: RAACommitmentOrder::CommitmentFirst,
 492
 493                         monitor_pending_funding_locked: false,
 494                         monitor_pending_revoke_and_ack: false,
 495                         monitor_pending_commitment_signed: false,
 496                         monitor_pending_forwards: Vec::new(),
 497                         monitor_pending_failures: Vec::new(),
 498
 499                         #[cfg(debug_assertions)]
 500                         max_commitment_tx_output_local: ::std::sync::Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
 501                         #[cfg(debug_assertions)]
 502                         max_commitment_tx_output_remote: ::std::sync::Mutex::new((channel_value_satoshis * 1000 - push_msat, push_msat)),
 503
 504                         last_sent_closing_fee: None,
 505
 506                         funding_txo: None,
 507                         funding_tx_confirmed_in: None,
 508                         short_channel_id: None,
 509                         last_block_connected: Default::default(),
 510                         funding_tx_confirmations: 0,
 511
 512                         feerate_per_kw: feerate,
 513                         their_dust_limit_satoshis: 0,
 514                         our_dust_limit_satoshis: Channel::<ChanSigner>::derive_our_dust_limit_satoshis(background_feerate),
 515                         their_max_htlc_value_in_flight_msat: 0,
 516                         their_channel_reserve_satoshis: 0,
 517                         their_htlc_minimum_msat: 0,
 518                         our_htlc_minimum_msat: if config.own_channel_config.our_htlc_minimum_msat == 0 { 1 } else { config.own_channel_config.our_htlc_minimum_msat },
 519                         their_to_self_delay: 0,
 520                         our_to_self_delay: config.own_channel_config.our_to_self_delay,
 521                         their_max_accepted_htlcs: 0,
 522                         minimum_depth: 0, // Filled in in accept_channel
 523
 524                         their_pubkeys: None,
 525                         their_cur_commitment_point: None,
 526
 527                         their_prev_commitment_point: None,
 528                         their_node_id: their_node_id,
 529
 530                         their_shutdown_scriptpubkey: None,
 531
 532                         channel_monitor: None,
 533                         commitment_secrets: CounterpartyCommitmentSecrets::new(),
 534
 535                         network_sync: UpdateStatus::Fresh,
 536
 537                         logger,
 538                 })
 539         }
 540
 541         fn check_remote_fee<F: Deref>(fee_estimator: &F, feerate_per_kw: u32) -> Result<(), ChannelError>
 542                 where F::Target: FeeEstimator
 543         {
 544                 if (feerate_per_kw as u64) < fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background) {
 545                         return Err(ChannelError::Close("Peer's feerate much too low"));
 546                 }
 547                 if (feerate_per_kw as u64) > fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::HighPriority) * 2 {
 548                         return Err(ChannelError::Close("Peer's feerate much too high"));
 549                 }
 550                 Ok(())
 551         }
 552
 553         /// Creates a new channel from a remote sides' request for one.
 554         /// Assumes chain_hash has already been checked and corresponds with what we expect!
 555         pub fn new_from_req<K: Deref, F: Deref>(fee_estimator: &F, keys_provider: &K, their_node_id: PublicKey, their_features: InitFeatures, msg: &msgs::OpenChannel, user_id: u64, logger: Arc<Logger>, config: &UserConfig) -> Result<Channel<ChanSigner>, ChannelError>
 556                 where K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
 557           F::Target: FeeEstimator
 558         {
 559                 let mut chan_keys = keys_provider.get_channel_keys(true, msg.funding_satoshis);
 560                 let their_pubkeys = ChannelPublicKeys {
 561                         funding_pubkey: msg.funding_pubkey,
 562                         revocation_basepoint: msg.revocation_basepoint,
 563                         payment_basepoint: msg.payment_basepoint,
 564                         delayed_payment_basepoint: msg.delayed_payment_basepoint,
 565                         htlc_basepoint: msg.htlc_basepoint
 566                 };
 567                 chan_keys.set_remote_channel_pubkeys(&their_pubkeys);
 568                 let mut local_config = (*config).channel_options.clone();
 569
 570                 if config.own_channel_config.our_to_self_delay < BREAKDOWN_TIMEOUT {
 571                         return Err(ChannelError::Close("Configured with an unreasonable our_to_self_delay putting user funds at risks"));
 572                 }
 573
 574                 // Check sanity of message fields:
 575                 if msg.funding_satoshis >= MAX_FUNDING_SATOSHIS {
 576                         return Err(ChannelError::Close("funding value > 2^24"));
 577                 }
 578                 if msg.channel_reserve_satoshis > msg.funding_satoshis {
 579                         return Err(ChannelError::Close("Bogus channel_reserve_satoshis"));
 580                 }
 581                 if msg.push_msat > (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
 582                         return Err(ChannelError::Close("push_msat larger than funding value"));
 583                 }
 584                 if msg.dust_limit_satoshis > msg.funding_satoshis {
 585                         return Err(ChannelError::Close("Peer never wants payout outputs?"));
 586                 }
 587                 if msg.dust_limit_satoshis > msg.channel_reserve_satoshis {
 588                         return Err(ChannelError::Close("Bogus; channel reserve is less than dust limit"));
 589                 }
 590                 if msg.htlc_minimum_msat >= (msg.funding_satoshis - msg.channel_reserve_satoshis) * 1000 {
 591                         return Err(ChannelError::Close("Minimum htlc value is full channel value"));
 592                 }
 593                 Channel::<ChanSigner>::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
 594
 595                 if msg.to_self_delay > config.peer_channel_config_limits.their_to_self_delay || msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
 596                         return Err(ChannelError::Close("They wanted our payments to be delayed by a needlessly long period"));
 597                 }
 598                 if msg.max_accepted_htlcs < 1 {
 599                         return Err(ChannelError::Close("0 max_accpted_htlcs makes for a useless channel"));
 600                 }
 601                 if msg.max_accepted_htlcs > 483 {
 602                         return Err(ChannelError::Close("max_accpted_htlcs > 483"));
 603                 }
 604
 605                 // Now check against optional parameters as set by config...
 606                 if msg.funding_satoshis < config.peer_channel_config_limits.min_funding_satoshis {
 607                         return Err(ChannelError::Close("funding satoshis is less than the user specified limit"));
 608                 }
 609                 if msg.htlc_minimum_msat > config.peer_channel_config_limits.max_htlc_minimum_msat {
 610                         return Err(ChannelError::Close("htlc minimum msat is higher than the user specified limit"));
 611                 }
 612                 if msg.max_htlc_value_in_flight_msat < config.peer_channel_config_limits.min_max_htlc_value_in_flight_msat {
 613                         return Err(ChannelError::Close("max htlc value in flight msat is less than the user specified limit"));
 614                 }
 615                 if msg.channel_reserve_satoshis > config.peer_channel_config_limits.max_channel_reserve_satoshis {
 616                         return Err(ChannelError::Close("channel reserve satoshis is higher than the user specified limit"));
 617                 }
 618                 if msg.max_accepted_htlcs < config.peer_channel_config_limits.min_max_accepted_htlcs {
 619                         return Err(ChannelError::Close("max accepted htlcs is less than the user specified limit"));
 620                 }
 621                 if msg.dust_limit_satoshis < config.peer_channel_config_limits.min_dust_limit_satoshis {
 622                         return Err(ChannelError::Close("dust limit satoshis is less than the user specified limit"));
 623                 }
 624                 if msg.dust_limit_satoshis > config.peer_channel_config_limits.max_dust_limit_satoshis {
 625                         return Err(ChannelError::Close("dust limit satoshis is greater than the user specified limit"));
 626                 }
 627
 628                 // Convert things into internal flags and prep our state:
 629
 630                 let their_announce = if (msg.channel_flags & 1) == 1 { true } else { false };
 631                 if config.peer_channel_config_limits.force_announced_channel_preference {
 632                         if local_config.announced_channel != their_announce {
 633                                 return Err(ChannelError::Close("Peer tried to open channel but their announcement preference is different from ours"));
 634                         }
 635                 }
 636                 // we either accept their preference or the preferences match
 637                 local_config.announced_channel = their_announce;
 638
 639                 let background_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
 640
 641                 let our_dust_limit_satoshis = Channel::<ChanSigner>::derive_our_dust_limit_satoshis(background_feerate);
 642                 let our_channel_reserve_satoshis = Channel::<ChanSigner>::get_our_channel_reserve_satoshis(msg.funding_satoshis);
 643                 if our_channel_reserve_satoshis < our_dust_limit_satoshis {
 644                         return Err(ChannelError::Close("Suitable channel reserve not found. aborting"));
 645                 }
 646                 if msg.channel_reserve_satoshis < our_dust_limit_satoshis {
 647                         return Err(ChannelError::Close("channel_reserve_satoshis too small"));
 648                 }
 649                 if our_channel_reserve_satoshis < msg.dust_limit_satoshis {
 650                         return Err(ChannelError::Close("Dust limit too high for our channel reserve"));
 651                 }
 652
 653                 // check if the funder's amount for the initial commitment tx is sufficient
 654                 // for full fee payment
 655                 let funders_amount_msat = msg.funding_satoshis * 1000 - msg.push_msat;
 656                 if funders_amount_msat < background_feerate * COMMITMENT_TX_BASE_WEIGHT {
 657                         return Err(ChannelError::Close("Insufficient funding amount for initial commitment"));
 658                 }
 659
 660                 let to_local_msat = msg.push_msat;
 661                 let to_remote_msat = funders_amount_msat - background_feerate * COMMITMENT_TX_BASE_WEIGHT;
 662                 if to_local_msat <= msg.channel_reserve_satoshis * 1000 && to_remote_msat <= our_channel_reserve_satoshis * 1000 {
 663                         return Err(ChannelError::Close("Insufficient funding amount for initial commitment"));
 664                 }
 665
 666                 let their_shutdown_scriptpubkey = if their_features.supports_upfront_shutdown_script() {
 667                         match &msg.shutdown_scriptpubkey {
 668                                 &OptionalField::Present(ref script) => {
 669                                         // Peer is signaling upfront_shutdown and has provided a non-accepted scriptpubkey format. We enforce it while receiving shutdown msg
 670                                         if script.is_p2pkh() || script.is_p2sh() || script.is_v0_p2wsh() || script.is_v0_p2wpkh() {
 671                                                 Some(script.clone())
 672                                         // Peer is signaling upfront_shutdown and has opt-out with a 0-length script. We don't enforce anything
 673                                         } else if script.len() == 0 {
 674                                                 None
 675                                         // Peer is signaling upfront_shutdown and has provided a non-accepted scriptpubkey format. Fail the channel
 676                                         } else {
 677                                                 return Err(ChannelError::Close("Peer is signaling upfront_shutdown but has provided a non-accepted scriptpubkey format"));
 678                                         }
 679                                 },
 680                                 // Peer is signaling upfront shutdown but don't opt-out with correct mechanism (a.k.a 0-length script). Peer looks buggy, we fail the channel
 681                                 &OptionalField::Absent => {
 682                                         return Err(ChannelError::Close("Peer is signaling upfront_shutdown but we don't get any script. Use 0-length script to opt-out"));
 683                                 }
 684                         }
 685                 } else { None };
 686
 687                 let chan = Channel {
 688                         user_id: user_id,
 689                         config: local_config,
 690
 691                         channel_id: msg.temporary_channel_id,
 692                         channel_state: (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32),
 693                         channel_outbound: false,
 694                         secp_ctx: Secp256k1::new(),
 695
 696                         latest_monitor_update_id: 0,
 697
 698                         local_keys: chan_keys,
 699                         shutdown_pubkey: keys_provider.get_shutdown_pubkey(),
 700                         destination_script: keys_provider.get_destination_script(),
 701
 702                         cur_local_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
 703                         cur_remote_commitment_transaction_number: INITIAL_COMMITMENT_NUMBER,
 704                         value_to_self_msat: msg.push_msat,
 705
 706                         pending_inbound_htlcs: Vec::new(),
 707                         pending_outbound_htlcs: Vec::new(),
 708                         holding_cell_htlc_updates: Vec::new(),
 709                         pending_update_fee: None,
 710                         holding_cell_update_fee: None,
 711                         next_local_htlc_id: 0,
 712                         next_remote_htlc_id: 0,
 713                         update_time_counter: 1,
 714
 715                         resend_order: RAACommitmentOrder::CommitmentFirst,
 716
 717                         monitor_pending_funding_locked: false,
 718                         monitor_pending_revoke_and_ack: false,
 719                         monitor_pending_commitment_signed: false,
 720                         monitor_pending_forwards: Vec::new(),
 721                         monitor_pending_failures: Vec::new(),
 722
 723                         #[cfg(debug_assertions)]
 724                         max_commitment_tx_output_local: ::std::sync::Mutex::new((msg.push_msat, msg.funding_satoshis * 1000 - msg.push_msat)),
 725                         #[cfg(debug_assertions)]
 726                         max_commitment_tx_output_remote: ::std::sync::Mutex::new((msg.push_msat, msg.funding_satoshis * 1000 - msg.push_msat)),
 727
 728                         last_sent_closing_fee: None,
 729
 730                         funding_txo: None,
 731                         funding_tx_confirmed_in: None,
 732                         short_channel_id: None,
 733                         last_block_connected: Default::default(),
 734                         funding_tx_confirmations: 0,
 735
 736                         feerate_per_kw: msg.feerate_per_kw as u64,
 737                         channel_value_satoshis: msg.funding_satoshis,
 738                         their_dust_limit_satoshis: msg.dust_limit_satoshis,
 739                         our_dust_limit_satoshis: our_dust_limit_satoshis,
 740                         their_max_htlc_value_in_flight_msat: cmp::min(msg.max_htlc_value_in_flight_msat, msg.funding_satoshis * 1000),
 741                         their_channel_reserve_satoshis: msg.channel_reserve_satoshis,
 742                         their_htlc_minimum_msat: msg.htlc_minimum_msat,
 743                         our_htlc_minimum_msat: if config.own_channel_config.our_htlc_minimum_msat == 0 { 1 } else { config.own_channel_config.our_htlc_minimum_msat },
 744                         their_to_self_delay: msg.to_self_delay,
 745                         our_to_self_delay: config.own_channel_config.our_to_self_delay,
 746                         their_max_accepted_htlcs: msg.max_accepted_htlcs,
 747                         minimum_depth: config.own_channel_config.minimum_depth,
 748
 749                         their_pubkeys: Some(their_pubkeys),
 750                         their_cur_commitment_point: Some(msg.first_per_commitment_point),
 751
 752                         their_prev_commitment_point: None,
 753                         their_node_id: their_node_id,
 754
 755                         their_shutdown_scriptpubkey,
 756
 757                         channel_monitor: None,
 758                         commitment_secrets: CounterpartyCommitmentSecrets::new(),
 759
 760                         network_sync: UpdateStatus::Fresh,
 761
 762                         logger,
 763                 };
 764
 765                 Ok(chan)
 766         }
 767
 768         // Utilities to derive keys:
 769
 770         fn build_local_commitment_secret(&self, idx: u64) -> SecretKey {
 771                 let res = chan_utils::build_commitment_secret(self.local_keys.commitment_seed(), idx);
 772                 SecretKey::from_slice(&res).unwrap()
 773         }
 774
 775         // Utilities to build transactions:
 776
 777         fn get_commitment_transaction_number_obscure_factor(&self) -> u64 {
 778                 let mut sha = Sha256::engine();
 779                 let our_payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.payment_base_key());
 780
 781                 let their_payment_basepoint = &self.their_pubkeys.as_ref().unwrap().payment_basepoint.serialize();
 782                 if self.channel_outbound {
 783                         sha.input(&our_payment_basepoint.serialize());
 784                         sha.input(their_payment_basepoint);
 785                 } else {
 786                         sha.input(their_payment_basepoint);
 787                         sha.input(&our_payment_basepoint.serialize());
 788                 }
 789                 let res = Sha256::from_engine(sha).into_inner();
 790
 791                 ((res[26] as u64) << 5*8) |
 792                 ((res[27] as u64) << 4*8) |
 793                 ((res[28] as u64) << 3*8) |
 794                 ((res[29] as u64) << 2*8) |
 795                 ((res[30] as u64) << 1*8) |
 796                 ((res[31] as u64) << 0*8)
 797         }
 798
 799         /// Transaction nomenclature is somewhat confusing here as there are many different cases - a
 800         /// transaction is referred to as "a's transaction" implying that a will be able to broadcast
 801         /// the transaction. Thus, b will generally be sending a signature over such a transaction to
 802         /// a, and a can revoke the transaction by providing b the relevant per_commitment_secret. As
 803         /// such, a transaction is generally the result of b increasing the amount paid to a (or adding
 804         /// an HTLC to a).
 805         /// @local is used only to convert relevant internal structures which refer to remote vs local
 806         /// to decide value of outputs and direction of HTLCs.
 807         /// @generated_by_local is used to determine *which* HTLCs to include - noting that the HTLC
 808         /// state may indicate that one peer has informed the other that they'd like to add an HTLC but
 809         /// have not yet committed it. Such HTLCs will only be included in transactions which are being
 810         /// generated by the peer which proposed adding the HTLCs, and thus we need to understand both
 811         /// which peer generated this transaction and "to whom" this transaction flows.
 812         /// Returns (the transaction built, the number of HTLC outputs which were present in the
 813         /// transaction, the list of HTLCs which were not ignored when building the transaction).
 814         /// Note that below-dust HTLCs are included in the third return value, but not the second, and
 815         /// sources are provided only for outbound HTLCs in the third return value.
 816         #[inline]
 817         fn build_commitment_transaction(&self, commitment_number: u64, keys: &TxCreationKeys, local: bool, generated_by_local: bool, feerate_per_kw: u64) -> (Transaction, usize, Vec<(HTLCOutputInCommitment, Option<&HTLCSource>)>) {
 818                 let obscured_commitment_transaction_number = self.get_commitment_transaction_number_obscure_factor() ^ (INITIAL_COMMITMENT_NUMBER - commitment_number);
 819
 820                 let txins = {
 821                         let mut ins: Vec<TxIn> = Vec::new();
 822                         ins.push(TxIn {
 823                                 previous_output: self.funding_txo.unwrap().into_bitcoin_outpoint(),
 824                                 script_sig: Script::new(),
 825                                 sequence: ((0x80 as u32) << 8*3) | ((obscured_commitment_transaction_number >> 3*8) as u32),
 826                                 witness: Vec::new(),
 827                         });
 828                         ins
 829                 };
 830
 831                 let mut txouts: Vec<(TxOut, Option<(HTLCOutputInCommitment, Option<&HTLCSource>)>)> = Vec::with_capacity(self.pending_inbound_htlcs.len() + self.pending_outbound_htlcs.len() + 2);
 832                 let mut included_dust_htlcs: Vec<(HTLCOutputInCommitment, Option<&HTLCSource>)> = Vec::new();
 833
 834                 let dust_limit_satoshis = if local { self.our_dust_limit_satoshis } else { self.their_dust_limit_satoshis };
 835                 let mut remote_htlc_total_msat = 0;
 836                 let mut local_htlc_total_msat = 0;
 837                 let mut value_to_self_msat_offset = 0;
 838
 839                 log_trace!(self, "Building commitment transaction number {} (really {} xor {}) for {}, generated by {} with fee {}...", commitment_number, (INITIAL_COMMITMENT_NUMBER - commitment_number), self.get_commitment_transaction_number_obscure_factor(), if local { "us" } else { "remote" }, if generated_by_local { "us" } else { "remote" }, feerate_per_kw);
 840
 841                 macro_rules! get_htlc_in_commitment {
 842                         ($htlc: expr, $offered: expr) => {
 843                                 HTLCOutputInCommitment {
 844                                         offered: $offered,
 845                                         amount_msat: $htlc.amount_msat,
 846                                         cltv_expiry: $htlc.cltv_expiry,
 847                                         payment_hash: $htlc.payment_hash,
 848                                         transaction_output_index: None
 849                                 }
 850                         }
 851                 }
 852
 853                 macro_rules! add_htlc_output {
 854                         ($htlc: expr, $outbound: expr, $source: expr, $state_name: expr) => {
 855                                 if $outbound == local { // "offered HTLC output"
 856                                         let htlc_in_tx = get_htlc_in_commitment!($htlc, true);
 857                                         if $htlc.amount_msat / 1000 >= dust_limit_satoshis + (feerate_per_kw * HTLC_TIMEOUT_TX_WEIGHT / 1000) {
 858                                                 log_trace!(self, "   ...including {} {} HTLC {} (hash {}) with value {}", if $outbound { "outbound" } else { "inbound" }, $state_name, $htlc.htlc_id, log_bytes!($htlc.payment_hash.0), $htlc.amount_msat);
 859                                                 txouts.push((TxOut {
 860                                                         script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
 861                                                         value: $htlc.amount_msat / 1000
 862                                                 }, Some((htlc_in_tx, $source))));
 863                                         } else {
 864                                                 log_trace!(self, "   ...including {} {} dust HTLC {} (hash {}) with value {} due to dust limit", if $outbound { "outbound" } else { "inbound" }, $state_name, $htlc.htlc_id, log_bytes!($htlc.payment_hash.0), $htlc.amount_msat);
 865                                                 included_dust_htlcs.push((htlc_in_tx, $source));
 866                                         }
 867                                 } else {
 868                                         let htlc_in_tx = get_htlc_in_commitment!($htlc, false);
 869                                         if $htlc.amount_msat / 1000 >= dust_limit_satoshis + (feerate_per_kw * HTLC_SUCCESS_TX_WEIGHT / 1000) {
 870                                                 log_trace!(self, "   ...including {} {} HTLC {} (hash {}) with value {}", if $outbound { "outbound" } else { "inbound" }, $state_name, $htlc.htlc_id, log_bytes!($htlc.payment_hash.0), $htlc.amount_msat);
 871                                                 txouts.push((TxOut { // "received HTLC output"
 872                                                         script_pubkey: chan_utils::get_htlc_redeemscript(&htlc_in_tx, &keys).to_v0_p2wsh(),
 873                                                         value: $htlc.amount_msat / 1000
 874                                                 }, Some((htlc_in_tx, $source))));
 875                                         } else {
 876                                                 log_trace!(self, "   ...including {} {} dust HTLC {} (hash {}) with value {}", if $outbound { "outbound" } else { "inbound" }, $state_name, $htlc.htlc_id, log_bytes!($htlc.payment_hash.0), $htlc.amount_msat);
 877                                                 included_dust_htlcs.push((htlc_in_tx, $source));
 878                                         }
 879                                 }
 880                         }
 881                 }
 882
 883                 for ref htlc in self.pending_inbound_htlcs.iter() {
 884                         let (include, state_name) = match htlc.state {
 885                                 InboundHTLCState::RemoteAnnounced(_) => (!generated_by_local, "RemoteAnnounced"),
 886                                 InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_) => (!generated_by_local, "AwaitingRemoteRevokeToAnnounce"),
 887                                 InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) => (true, "AwaitingAnnouncedRemoteRevoke"),
 888                                 InboundHTLCState::Committed => (true, "Committed"),
 889                                 InboundHTLCState::LocalRemoved(_) => (!generated_by_local, "LocalRemoved"),
 890                         };
 891
 892                         if include {
 893                                 add_htlc_output!(htlc, false, None, state_name);
 894                                 remote_htlc_total_msat += htlc.amount_msat;
 895                         } else {
 896                                 log_trace!(self, "   ...not including inbound HTLC {} (hash {}) with value {} due to state ({})", htlc.htlc_id, log_bytes!(htlc.payment_hash.0), htlc.amount_msat, state_name);
 897                                 match &htlc.state {
 898                                         &InboundHTLCState::LocalRemoved(ref reason) => {
 899                                                 if generated_by_local {
 900                                                         if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
 901                                                                 value_to_self_msat_offset += htlc.amount_msat as i64;
 902                                                         }
 903                                                 }
 904                                         },
 905                                         _ => {},
 906                                 }
 907                         }
 908                 }
 909
 910                 for ref htlc in self.pending_outbound_htlcs.iter() {
 911                         let (include, state_name) = match htlc.state {
 912                                 OutboundHTLCState::LocalAnnounced(_) => (generated_by_local, "LocalAnnounced"),
 913                                 OutboundHTLCState::Committed => (true, "Committed"),
 914                                 OutboundHTLCState::RemoteRemoved(_) => (generated_by_local, "RemoteRemoved"),
 915                                 OutboundHTLCState::AwaitingRemoteRevokeToRemove(_) => (generated_by_local, "AwaitingRemoteRevokeToRemove"),
 916                                 OutboundHTLCState::AwaitingRemovedRemoteRevoke(_) => (false, "AwaitingRemovedRemoteRevoke"),
 917                         };
 918
 919                         if include {
 920                                 add_htlc_output!(htlc, true, Some(&htlc.source), state_name);
 921                                 local_htlc_total_msat += htlc.amount_msat;
 922                         } else {
 923                                 log_trace!(self, "   ...not including outbound HTLC {} (hash {}) with value {} due to state ({})", htlc.htlc_id, log_bytes!(htlc.payment_hash.0), htlc.amount_msat, state_name);
 924                                 match htlc.state {
 925                                         OutboundHTLCState::AwaitingRemoteRevokeToRemove(None)|OutboundHTLCState::AwaitingRemovedRemoteRevoke(None) => {
 926                                                 value_to_self_msat_offset -= htlc.amount_msat as i64;
 927                                         },
 928                                         OutboundHTLCState::RemoteRemoved(None) => {
 929                                                 if !generated_by_local {
 930                                                         value_to_self_msat_offset -= htlc.amount_msat as i64;
 931                                                 }
 932                                         },
 933                                         _ => {},
 934                                 }
 935                         }
 936                 }
 937
 938                 let value_to_self_msat: i64 = (self.value_to_self_msat - local_htlc_total_msat) as i64 + value_to_self_msat_offset;
 939                 assert!(value_to_self_msat >= 0);
 940                 // Note that in case they have several just-awaiting-last-RAA fulfills in-progress (ie
 941                 // AwaitingRemoteRevokeToRemove or AwaitingRemovedRemoteRevoke) we may have allowed them to
 942                 // "violate" their reserve value by couting those against it. Thus, we have to convert
 943                 // everything to i64 before subtracting as otherwise we can overflow.
 944                 let value_to_remote_msat: i64 = (self.channel_value_satoshis * 1000) as i64 - (self.value_to_self_msat as i64) - (remote_htlc_total_msat as i64) - value_to_self_msat_offset;
 945                 assert!(value_to_remote_msat >= 0);
 946
 947                 #[cfg(debug_assertions)]
 948                 {
 949                         // Make sure that the to_self/to_remote is always either past the appropriate
 950                         // channel_reserve *or* it is making progress towards it.
 951                         let mut max_commitment_tx_output = if generated_by_local {
 952                                 self.max_commitment_tx_output_local.lock().unwrap()
 953                         } else {
 954                                 self.max_commitment_tx_output_remote.lock().unwrap()
 955                         };
 956                         debug_assert!(max_commitment_tx_output.0 <= value_to_self_msat as u64 || value_to_self_msat / 1000 >= self.their_channel_reserve_satoshis as i64);
 957                         max_commitment_tx_output.0 = cmp::max(max_commitment_tx_output.0, value_to_self_msat as u64);
 958                         debug_assert!(max_commitment_tx_output.1 <= value_to_remote_msat as u64 || value_to_remote_msat / 1000 >= Channel::<ChanSigner>::get_our_channel_reserve_satoshis(self.channel_value_satoshis) as i64);
 959                         max_commitment_tx_output.1 = cmp::max(max_commitment_tx_output.1, value_to_remote_msat as u64);
 960                 }
 961
 962                 let total_fee: u64 = feerate_per_kw * (COMMITMENT_TX_BASE_WEIGHT + (txouts.len() as u64) * COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000;
 963                 let (value_to_self, value_to_remote) = if self.channel_outbound {
 964                         (value_to_self_msat / 1000 - total_fee as i64, value_to_remote_msat / 1000)
 965                 } else {
 966                         (value_to_self_msat / 1000, value_to_remote_msat / 1000 - total_fee as i64)
 967                 };
 968
 969                 let value_to_a = if local { value_to_self } else { value_to_remote };
 970                 let value_to_b = if local { value_to_remote } else { value_to_self };
 971
 972                 if value_to_a >= (dust_limit_satoshis as i64) {
 973                         log_trace!(self, "   ...including {} output with value {}", if local { "to_local" } else { "to_remote" }, value_to_a);
 974                         txouts.push((TxOut {
 975                                 script_pubkey: chan_utils::get_revokeable_redeemscript(&keys.revocation_key,
 976                                                                                        if local { self.their_to_self_delay } else { self.our_to_self_delay },
 977                                                                                        &keys.a_delayed_payment_key).to_v0_p2wsh(),
 978                                 value: value_to_a as u64
 979                         }, None));
 980                 }
 981
 982                 if value_to_b >= (dust_limit_satoshis as i64) {
 983                         log_trace!(self, "   ...including {} output with value {}", if local { "to_remote" } else { "to_local" }, value_to_b);
 984                         txouts.push((TxOut {
 985                                 script_pubkey: Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0)
 986                                                              .push_slice(&Hash160::hash(&keys.b_payment_key.serialize())[..])
 987                                                              .into_script(),
 988                                 value: value_to_b as u64
 989                         }, None));
 990                 }
 991
 992                 transaction_utils::sort_outputs(&mut txouts, |a, b| {
 993                         if let &Some(ref a_htlc) = a {
 994                                 if let &Some(ref b_htlc) = b {
 995                                         a_htlc.0.cltv_expiry.cmp(&b_htlc.0.cltv_expiry)
 996                                                 // Note that due to hash collisions, we have to have a fallback comparison
 997                                                 // here for fuzztarget mode (otherwise at least chanmon_fail_consistency
 998                                                 // may fail)!
 999                                                 .then(a_htlc.0.payment_hash.0.cmp(&b_htlc.0.payment_hash.0))
1000                                 // For non-HTLC outputs, if they're copying our SPK we don't really care if we
1001                                 // close the channel due to mismatches - they're doing something dumb:
1002                                 } else { cmp::Ordering::Equal }
1003                         } else { cmp::Ordering::Equal }
1004                 });
1005
1006                 let mut outputs: Vec<TxOut> = Vec::with_capacity(txouts.len());
1007                 let mut htlcs_included: Vec<(HTLCOutputInCommitment, Option<&HTLCSource>)> = Vec::with_capacity(txouts.len() + included_dust_htlcs.len());
1008                 for (idx, mut out) in txouts.drain(..).enumerate() {
1009                         outputs.push(out.0);
1010                         if let Some((mut htlc, source_option)) = out.1.take() {
1011                                 htlc.transaction_output_index = Some(idx as u32);
1012                                 htlcs_included.push((htlc, source_option));
1013                         }
1014                 }
1015                 let non_dust_htlc_count = htlcs_included.len();
1016                 htlcs_included.append(&mut included_dust_htlcs);
1017
1018                 (Transaction {
1019                         version: 2,
1020                         lock_time: ((0x20 as u32) << 8*3) | ((obscured_commitment_transaction_number & 0xffffffu64) as u32),
1021                         input: txins,
1022                         output: outputs,
1023                 }, non_dust_htlc_count, htlcs_included)
1024         }
1025
1026         #[inline]
1027         fn get_closing_scriptpubkey(&self) -> Script {
1028                 let our_channel_close_key_hash = Hash160::hash(&self.shutdown_pubkey.serialize());
1029                 Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&our_channel_close_key_hash[..]).into_script()
1030         }
1031
1032         #[inline]
1033         fn get_closing_transaction_weight(a_scriptpubkey: &Script, b_scriptpubkey: &Script) -> u64 {
1034                 (4 + 1 + 36 + 4 + 1 + 1 + 2*(8+1) + 4 + a_scriptpubkey.len() as u64 + b_scriptpubkey.len() as u64)*4 + 2 + 1 + 1 + 2*(1 + 72)
1035         }
1036
1037         #[inline]
1038         fn build_closing_transaction(&self, proposed_total_fee_satoshis: u64, skip_remote_output: bool) -> (Transaction, u64) {
1039                 let txins = {
1040                         let mut ins: Vec<TxIn> = Vec::new();
1041                         ins.push(TxIn {
1042                                 previous_output: self.funding_txo.unwrap().into_bitcoin_outpoint(),
1043                                 script_sig: Script::new(),
1044                                 sequence: 0xffffffff,
1045                                 witness: Vec::new(),
1046                         });
1047                         ins
1048                 };
1049
1050                 assert!(self.pending_inbound_htlcs.is_empty());
1051                 assert!(self.pending_outbound_htlcs.is_empty());
1052                 let mut txouts: Vec<(TxOut, ())> = Vec::new();
1053
1054                 let mut total_fee_satoshis = proposed_total_fee_satoshis;
1055                 let value_to_self: i64 = (self.value_to_self_msat as i64) / 1000 - if self.channel_outbound { total_fee_satoshis as i64 } else { 0 };
1056                 let value_to_remote: i64 = ((self.channel_value_satoshis * 1000 - self.value_to_self_msat) as i64 / 1000) - if self.channel_outbound { 0 } else { total_fee_satoshis as i64 };
1057
1058                 if value_to_self < 0 {
1059                         assert!(self.channel_outbound);
1060                         total_fee_satoshis += (-value_to_self) as u64;
1061                 } else if value_to_remote < 0 {
1062                         assert!(!self.channel_outbound);
1063                         total_fee_satoshis += (-value_to_remote) as u64;
1064                 }
1065
1066                 if !skip_remote_output && value_to_remote as u64 > self.our_dust_limit_satoshis {
1067                         txouts.push((TxOut {
1068                                 script_pubkey: self.their_shutdown_scriptpubkey.clone().unwrap(),
1069                                 value: value_to_remote as u64
1070                         }, ()));
1071                 }
1072
1073                 if value_to_self as u64 > self.our_dust_limit_satoshis {
1074                         txouts.push((TxOut {
1075                                 script_pubkey: self.get_closing_scriptpubkey(),
1076                                 value: value_to_self as u64
1077                         }, ()));
1078                 }
1079
1080                 transaction_utils::sort_outputs(&mut txouts, |_, _| { cmp::Ordering::Equal }); // Ordering doesnt matter if they used our pubkey...
1081
1082                 let mut outputs: Vec<TxOut> = Vec::new();
1083                 for out in txouts.drain(..) {
1084                         outputs.push(out.0);
1085                 }
1086
1087                 (Transaction {
1088                         version: 2,
1089                         lock_time: 0,
1090                         input: txins,
1091                         output: outputs,
1092                 }, total_fee_satoshis)
1093         }
1094
1095         #[inline]
1096         /// Creates a set of keys for build_commitment_transaction to generate a transaction which our
1097         /// counterparty will sign (ie DO NOT send signatures over a transaction created by this to
1098         /// our counterparty!)
1099         /// The result is a transaction which we can revoke ownership of (ie a "local" transaction)
1100         /// TODO Some magic rust shit to compile-time check this?
1101         fn build_local_transaction_keys(&self, commitment_number: u64) -> Result<TxCreationKeys, ChannelError> {
1102                 let per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(commitment_number));
1103                 let delayed_payment_base = PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.delayed_payment_base_key());
1104                 let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.htlc_base_key());
1105                 let their_pubkeys = self.their_pubkeys.as_ref().unwrap();
1106
1107                 Ok(secp_check!(TxCreationKeys::new(&self.secp_ctx, &per_commitment_point, &delayed_payment_base, &htlc_basepoint, &their_pubkeys.revocation_basepoint, &their_pubkeys.payment_basepoint, &their_pubkeys.htlc_basepoint), "Local tx keys generation got bogus keys"))
1108         }
1109
1110         #[inline]
1111         /// Creates a set of keys for build_commitment_transaction to generate a transaction which we
1112         /// will sign and send to our counterparty.
1113         /// If an Err is returned, it is a ChannelError::Close (for get_outbound_funding_created)
1114         fn build_remote_transaction_keys(&self) -> Result<TxCreationKeys, ChannelError> {
1115                 //TODO: Ensure that the payment_key derived here ends up in the library users' wallet as we
1116                 //may see payments to it!
1117                 let payment_basepoint = PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.payment_base_key());
1118                 let revocation_basepoint = PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.revocation_base_key());
1119                 let htlc_basepoint = PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.htlc_base_key());
1120                 let their_pubkeys = self.their_pubkeys.as_ref().unwrap();
1121
1122                 Ok(secp_check!(TxCreationKeys::new(&self.secp_ctx, &self.their_cur_commitment_point.unwrap(), &their_pubkeys.delayed_payment_basepoint, &their_pubkeys.htlc_basepoint, &revocation_basepoint, &payment_basepoint, &htlc_basepoint), "Remote tx keys generation got bogus keys"))
1123         }
1124
1125         /// Gets the redeemscript for the funding transaction output (ie the funding transaction output
1126         /// pays to get_funding_redeemscript().to_v0_p2wsh()).
1127         /// Panics if called before accept_channel/new_from_req
1128         pub fn get_funding_redeemscript(&self) -> Script {
1129                 let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.funding_key());
1130                 make_funding_redeemscript(&our_funding_key, self.their_funding_pubkey())
1131         }
1132
1133         /// Builds the htlc-success or htlc-timeout transaction which spends a given HTLC output
1134         /// @local is used only to convert relevant internal structures which refer to remote vs local
1135         /// to decide value of outputs and direction of HTLCs.
1136         fn build_htlc_transaction(&self, prev_hash: &Sha256dHash, htlc: &HTLCOutputInCommitment, local: bool, keys: &TxCreationKeys, feerate_per_kw: u64) -> Transaction {
1137                 chan_utils::build_htlc_transaction(prev_hash, feerate_per_kw, if local { self.their_to_self_delay } else { self.our_to_self_delay }, htlc, &keys.a_delayed_payment_key, &keys.revocation_key)
1138         }
1139
1140         /// Per HTLC, only one get_update_fail_htlc or get_update_fulfill_htlc call may be made.
1141         /// In such cases we debug_assert!(false) and return a ChannelError::Ignore. Thus, will always
1142         /// return Ok(_) if debug assertions are turned on or preconditions are met.
1143         ///
1144         /// Note that it is still possible to hit these assertions in case we find a preimage on-chain
1145         /// but then have a reorg which settles on an HTLC-failure on chain.
1146         fn get_update_fulfill_htlc(&mut self, htlc_id_arg: u64, payment_preimage_arg: PaymentPreimage) -> Result<(Option<msgs::UpdateFulfillHTLC>, Option<ChannelMonitorUpdate>), ChannelError> {
1147                 // Either ChannelFunded got set (which means it won't be unset) or there is no way any
1148                 // caller thought we could have something claimed (cause we wouldn't have accepted in an
1149                 // incoming HTLC anyway). If we got to ShutdownComplete, callers aren't allowed to call us,
1150                 // either.
1151                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1152                         panic!("Was asked to fulfill an HTLC when channel was not in an operational state");
1153                 }
1154                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1155
1156                 let payment_hash_calc = PaymentHash(Sha256::hash(&payment_preimage_arg.0[..]).into_inner());
1157
1158                 // ChannelManager may generate duplicate claims/fails due to HTLC update events from
1159                 // on-chain ChannelsMonitors during block rescan. Ideally we'd figure out a way to drop
1160                 // these, but for now we just have to treat them as normal.
1161
1162                 let mut pending_idx = std::usize::MAX;
1163                 for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
1164                         if htlc.htlc_id == htlc_id_arg {
1165                                 assert_eq!(htlc.payment_hash, payment_hash_calc);
1166                                 match htlc.state {
1167                                         InboundHTLCState::Committed => {},
1168                                         InboundHTLCState::LocalRemoved(ref reason) => {
1169                                                 if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
1170                                                 } else {
1171                                                         log_warn!(self, "Have preimage and want to fulfill HTLC with payment hash {} we already failed against channel {}", log_bytes!(htlc.payment_hash.0), log_bytes!(self.channel_id()));
1172                                                 }
1173                                                 debug_assert!(false, "Tried to fulfill an HTLC that was already fail/fulfilled");
1174                                                 return Ok((None, None));
1175                                         },
1176                                         _ => {
1177                                                 debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
1178                                                 // Don't return in release mode here so that we can update channel_monitor
1179                                         }
1180                                 }
1181                                 pending_idx = idx;
1182                                 break;
1183                         }
1184                 }
1185                 if pending_idx == std::usize::MAX {
1186                         return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID"));
1187                 }
1188
1189                 // Now update local state:
1190                 //
1191                 // We have to put the payment_preimage in the channel_monitor right away here to ensure we
1192                 // can claim it even if the channel hits the chain before we see their next commitment.
1193                 self.latest_monitor_update_id += 1;
1194                 let monitor_update = ChannelMonitorUpdate {
1195                         update_id: self.latest_monitor_update_id,
1196                         updates: vec![ChannelMonitorUpdateStep::PaymentPreimage {
1197                                 payment_preimage: payment_preimage_arg.clone(),
1198                         }],
1199                 };
1200                 self.channel_monitor.as_mut().unwrap().update_monitor_ooo(monitor_update.clone()).unwrap();
1201
1202                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
1203                         for pending_update in self.holding_cell_htlc_updates.iter() {
1204                                 match pending_update {
1205                                         &HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
1206                                                 if htlc_id_arg == htlc_id {
1207                                                         // Make sure we don't leave latest_monitor_update_id incremented here:
1208                                                         self.latest_monitor_update_id -= 1;
1209                                                         debug_assert!(false, "Tried to fulfill an HTLC that was already fulfilled");
1210                                                         return Ok((None, None));
1211                                                 }
1212                                         },
1213                                         &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
1214                                                 if htlc_id_arg == htlc_id {
1215                                                         log_warn!(self, "Have preimage and want to fulfill HTLC with pending failure against channel {}", log_bytes!(self.channel_id()));
1216                                                         // TODO: We may actually be able to switch to a fulfill here, though its
1217                                                         // rare enough it may not be worth the complexity burden.
1218                                                         debug_assert!(false, "Tried to fulfill an HTLC that was already failed");
1219                                                         return Ok((None, Some(monitor_update)));
1220                                                 }
1221                                         },
1222                                         _ => {}
1223                                 }
1224                         }
1225                         log_trace!(self, "Adding HTLC claim to holding_cell! Current state: {}", self.channel_state);
1226                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::ClaimHTLC {
1227                                 payment_preimage: payment_preimage_arg, htlc_id: htlc_id_arg,
1228                         });
1229                         return Ok((None, Some(monitor_update)));
1230                 }
1231
1232                 {
1233                         let htlc = &mut self.pending_inbound_htlcs[pending_idx];
1234                         if let InboundHTLCState::Committed = htlc.state {
1235                         } else {
1236                                 debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
1237                                 return Ok((None, Some(monitor_update)));
1238                         }
1239                         log_trace!(self, "Upgrading HTLC {} to LocalRemoved with a Fulfill!", log_bytes!(htlc.payment_hash.0));
1240                         htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::Fulfill(payment_preimage_arg.clone()));
1241                 }
1242
1243                 Ok((Some(msgs::UpdateFulfillHTLC {
1244                         channel_id: self.channel_id(),
1245                         htlc_id: htlc_id_arg,
1246                         payment_preimage: payment_preimage_arg,
1247                 }), Some(monitor_update)))
1248         }
1249
1250         pub fn get_update_fulfill_htlc_and_commit(&mut self, htlc_id: u64, payment_preimage: PaymentPreimage) -> Result<(Option<(msgs::UpdateFulfillHTLC, msgs::CommitmentSigned)>, Option<ChannelMonitorUpdate>), ChannelError> {
1251                 match self.get_update_fulfill_htlc(htlc_id, payment_preimage)? {
1252                         (Some(update_fulfill_htlc), Some(mut monitor_update)) => {
1253                                 let (commitment, mut additional_update) = self.send_commitment_no_status_check()?;
1254                                 // send_commitment_no_status_check may bump latest_monitor_id but we want them to be
1255                                 // strictly increasing by one, so decrement it here.
1256                                 self.latest_monitor_update_id = monitor_update.update_id;
1257                                 monitor_update.updates.append(&mut additional_update.updates);
1258                                 Ok((Some((update_fulfill_htlc, commitment)), Some(monitor_update)))
1259                         },
1260                         (Some(update_fulfill_htlc), None) => {
1261                                 let (commitment, monitor_update) = self.send_commitment_no_status_check()?;
1262                                 Ok((Some((update_fulfill_htlc, commitment)), Some(monitor_update)))
1263                         },
1264                         (None, Some(monitor_update)) => Ok((None, Some(monitor_update))),
1265                         (None, None) => Ok((None, None))
1266                 }
1267         }
1268
1269         /// Per HTLC, only one get_update_fail_htlc or get_update_fulfill_htlc call may be made.
1270         /// In such cases we debug_assert!(false) and return a ChannelError::Ignore. Thus, will always
1271         /// return Ok(_) if debug assertions are turned on or preconditions are met.
1272         ///
1273         /// Note that it is still possible to hit these assertions in case we find a preimage on-chain
1274         /// but then have a reorg which settles on an HTLC-failure on chain.
1275         pub fn get_update_fail_htlc(&mut self, htlc_id_arg: u64, err_packet: msgs::OnionErrorPacket) -> Result<Option<msgs::UpdateFailHTLC>, ChannelError> {
1276                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1277                         panic!("Was asked to fail an HTLC when channel was not in an operational state");
1278                 }
1279                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
1280
1281                 // ChannelManager may generate duplicate claims/fails due to HTLC update events from
1282                 // on-chain ChannelsMonitors during block rescan. Ideally we'd figure out a way to drop
1283                 // these, but for now we just have to treat them as normal.
1284
1285                 let mut pending_idx = std::usize::MAX;
1286                 for (idx, htlc) in self.pending_inbound_htlcs.iter().enumerate() {
1287                         if htlc.htlc_id == htlc_id_arg {
1288                                 match htlc.state {
1289                                         InboundHTLCState::Committed => {},
1290                                         InboundHTLCState::LocalRemoved(_) => {
1291                                                 debug_assert!(false, "Tried to fail an HTLC that was already fail/fulfilled");
1292                                                 return Ok(None);
1293                                         },
1294                                         _ => {
1295                                                 debug_assert!(false, "Have an inbound HTLC we tried to claim before it was fully committed to");
1296                                                 return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID"));
1297                                         }
1298                                 }
1299                                 pending_idx = idx;
1300                         }
1301                 }
1302                 if pending_idx == std::usize::MAX {
1303                         return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID"));
1304                 }
1305
1306                 // Now update local state:
1307                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
1308                         for pending_update in self.holding_cell_htlc_updates.iter() {
1309                                 match pending_update {
1310                                         &HTLCUpdateAwaitingACK::ClaimHTLC { htlc_id, .. } => {
1311                                                 if htlc_id_arg == htlc_id {
1312                                                         debug_assert!(false, "Tried to fail an HTLC that was already fulfilled");
1313                                                         return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID"));
1314                                                 }
1315                                         },
1316                                         &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, .. } => {
1317                                                 if htlc_id_arg == htlc_id {
1318                                                         debug_assert!(false, "Tried to fail an HTLC that was already failed");
1319                                                         return Err(ChannelError::Ignore("Unable to find a pending HTLC which matched the given HTLC ID"));
1320                                                 }
1321                                         },
1322                                         _ => {}
1323                                 }
1324                         }
1325                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::FailHTLC {
1326                                 htlc_id: htlc_id_arg,
1327                                 err_packet,
1328                         });
1329                         return Ok(None);
1330                 }
1331
1332                 {
1333                         let htlc = &mut self.pending_inbound_htlcs[pending_idx];
1334                         htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailRelay(err_packet.clone()));
1335                 }
1336
1337                 Ok(Some(msgs::UpdateFailHTLC {
1338                         channel_id: self.channel_id(),
1339                         htlc_id: htlc_id_arg,
1340                         reason: err_packet
1341                 }))
1342         }
1343
1344         // Message handlers:
1345
1346         pub fn accept_channel(&mut self, msg: &msgs::AcceptChannel, config: &UserConfig, their_features: InitFeatures) -> Result<(), ChannelError> {
1347                 // Check sanity of message fields:
1348                 if !self.channel_outbound {
1349                         return Err(ChannelError::Close("Got an accept_channel message from an inbound peer"));
1350                 }
1351                 if self.channel_state != ChannelState::OurInitSent as u32 {
1352                         return Err(ChannelError::Close("Got an accept_channel message at a strange time"));
1353                 }
1354                 if msg.dust_limit_satoshis > 21000000 * 100000000 {
1355                         return Err(ChannelError::Close("Peer never wants payout outputs?"));
1356                 }
1357                 if msg.channel_reserve_satoshis > self.channel_value_satoshis {
1358                         return Err(ChannelError::Close("Bogus channel_reserve_satoshis"));
1359                 }
1360                 if msg.dust_limit_satoshis > msg.channel_reserve_satoshis {
1361                         return Err(ChannelError::Close("Bogus channel_reserve and dust_limit"));
1362                 }
1363                 if msg.channel_reserve_satoshis < self.our_dust_limit_satoshis {
1364                         return Err(ChannelError::Close("Peer never wants payout outputs?"));
1365                 }
1366                 if msg.dust_limit_satoshis > Channel::<ChanSigner>::get_our_channel_reserve_satoshis(self.channel_value_satoshis) {
1367                         return Err(ChannelError::Close("Dust limit is bigger than our channel reverse"));
1368                 }
1369                 if msg.htlc_minimum_msat >= (self.channel_value_satoshis - msg.channel_reserve_satoshis) * 1000 {
1370                         return Err(ChannelError::Close("Minimum htlc value is full channel value"));
1371                 }
1372                 if msg.to_self_delay > config.peer_channel_config_limits.their_to_self_delay || msg.to_self_delay > MAX_LOCAL_BREAKDOWN_TIMEOUT {
1373                         return Err(ChannelError::Close("They wanted our payments to be delayed by a needlessly long period"));
1374                 }
1375                 if msg.max_accepted_htlcs < 1 {
1376                         return Err(ChannelError::Close("0 max_accepted_htlcs makes for a useless channel"));
1377                 }
1378                 if msg.max_accepted_htlcs > 483 {
1379                         return Err(ChannelError::Close("max_accepted_htlcs > 483"));
1380                 }
1381
1382                 // Now check against optional parameters as set by config...
1383                 if msg.htlc_minimum_msat > config.peer_channel_config_limits.max_htlc_minimum_msat {
1384                         return Err(ChannelError::Close("htlc minimum msat is higher than the user specified limit"));
1385                 }
1386                 if msg.max_htlc_value_in_flight_msat < config.peer_channel_config_limits.min_max_htlc_value_in_flight_msat {
1387                         return Err(ChannelError::Close("max htlc value in flight msat is less than the user specified limit"));
1388                 }
1389                 if msg.channel_reserve_satoshis > config.peer_channel_config_limits.max_channel_reserve_satoshis {
1390                         return Err(ChannelError::Close("channel reserve satoshis is higher than the user specified limit"));
1391                 }
1392                 if msg.max_accepted_htlcs < config.peer_channel_config_limits.min_max_accepted_htlcs {
1393                         return Err(ChannelError::Close("max accepted htlcs is less than the user specified limit"));
1394                 }
1395                 if msg.dust_limit_satoshis < config.peer_channel_config_limits.min_dust_limit_satoshis {
1396                         return Err(ChannelError::Close("dust limit satoshis is less than the user specified limit"));
1397                 }
1398                 if msg.dust_limit_satoshis > config.peer_channel_config_limits.max_dust_limit_satoshis {
1399                         return Err(ChannelError::Close("dust limit satoshis is greater than the user specified limit"));
1400                 }
1401                 if msg.minimum_depth > config.peer_channel_config_limits.max_minimum_depth {
1402                         return Err(ChannelError::Close("We consider the minimum depth to be unreasonably large"));
1403                 }
1404
1405                 let their_shutdown_scriptpubkey = if their_features.supports_upfront_shutdown_script() {
1406                         match &msg.shutdown_scriptpubkey {
1407                                 &OptionalField::Present(ref script) => {
1408                                         // Peer is signaling upfront_shutdown and has provided a non-accepted scriptpubkey format. We enforce it while receiving shutdown msg
1409                                         if script.is_p2pkh() || script.is_p2sh() || script.is_v0_p2wsh() || script.is_v0_p2wpkh() {
1410                                                 Some(script.clone())
1411                                         // Peer is signaling upfront_shutdown and has opt-out with a 0-length script. We don't enforce anything
1412                                         } else if script.len() == 0 {
1413                                                 None
1414                                         // Peer is signaling upfront_shutdown and has provided a non-accepted scriptpubkey format. Fail the channel
1415                                         } else {
1416                                                 return Err(ChannelError::Close("Peer is signaling upfront_shutdown but has provided a non-accepted scriptpubkey format"));
1417                                         }
1418                                 },
1419                                 // Peer is signaling upfront shutdown but don't opt-out with correct mechanism (a.k.a 0-length script). Peer looks buggy, we fail the channel
1420                                 &OptionalField::Absent => {
1421                                         return Err(ChannelError::Close("Peer is signaling upfront_shutdown but we don't get any script. Use 0-length script to opt-out"));
1422                                 }
1423                         }
1424                 } else { None };
1425
1426                 self.their_dust_limit_satoshis = msg.dust_limit_satoshis;
1427                 self.their_max_htlc_value_in_flight_msat = cmp::min(msg.max_htlc_value_in_flight_msat, self.channel_value_satoshis * 1000);
1428                 self.their_channel_reserve_satoshis = msg.channel_reserve_satoshis;
1429                 self.their_htlc_minimum_msat = msg.htlc_minimum_msat;
1430                 self.their_to_self_delay = msg.to_self_delay;
1431                 self.their_max_accepted_htlcs = msg.max_accepted_htlcs;
1432                 self.minimum_depth = msg.minimum_depth;
1433
1434                 let their_pubkeys = ChannelPublicKeys {
1435                         funding_pubkey: msg.funding_pubkey,
1436                         revocation_basepoint: msg.revocation_basepoint,
1437                         payment_basepoint: msg.payment_basepoint,
1438                         delayed_payment_basepoint: msg.delayed_payment_basepoint,
1439                         htlc_basepoint: msg.htlc_basepoint
1440                 };
1441
1442                 self.local_keys.set_remote_channel_pubkeys(&their_pubkeys);
1443                 self.their_pubkeys = Some(their_pubkeys);
1444
1445                 self.their_cur_commitment_point = Some(msg.first_per_commitment_point);
1446                 self.their_shutdown_scriptpubkey = their_shutdown_scriptpubkey;
1447
1448                 self.channel_state = ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32;
1449
1450                 Ok(())
1451         }
1452
1453         fn funding_created_signature(&mut self, sig: &Signature) -> Result<(Transaction, LocalCommitmentTransaction, Signature), ChannelError> {
1454                 let funding_script = self.get_funding_redeemscript();
1455
1456                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number)?;
1457                 let local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false, self.feerate_per_kw).0;
1458                 let local_sighash = hash_to_message!(&bip143::SighashComponents::new(&local_initial_commitment_tx).sighash_all(&local_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]);
1459
1460                 // They sign the "local" commitment transaction...
1461                 secp_check!(self.secp_ctx.verify(&local_sighash, &sig, self.their_funding_pubkey()), "Invalid funding_created signature from peer");
1462
1463                 let localtx = LocalCommitmentTransaction::new_missing_local_sig(local_initial_commitment_tx, sig, &PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.funding_key()), self.their_funding_pubkey(), local_keys, self.feerate_per_kw, Vec::new());
1464
1465                 let remote_keys = self.build_remote_transaction_keys()?;
1466                 let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false, self.feerate_per_kw).0;
1467                 let remote_signature = self.local_keys.sign_remote_commitment(self.feerate_per_kw, &remote_initial_commitment_tx, &remote_keys, &Vec::new(), self.our_to_self_delay, &self.secp_ctx)
1468                                 .map_err(|_| ChannelError::Close("Failed to get signatures for new commitment_signed"))?.0;
1469
1470                 // We sign the "remote" commitment transaction, allowing them to broadcast the tx if they wish.
1471                 Ok((remote_initial_commitment_tx, localtx, remote_signature))
1472         }
1473
1474         fn their_funding_pubkey(&self) -> &PublicKey {
1475                 &self.their_pubkeys.as_ref().expect("their_funding_pubkey() only allowed after accept_channel").funding_pubkey
1476         }
1477
1478         pub fn funding_created(&mut self, msg: &msgs::FundingCreated) -> Result<(msgs::FundingSigned, ChannelMonitor<ChanSigner>), ChannelError> {
1479                 if self.channel_outbound {
1480                         return Err(ChannelError::Close("Received funding_created for an outbound channel?"));
1481                 }
1482                 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
1483                         // BOLT 2 says that if we disconnect before we send funding_signed we SHOULD NOT
1484                         // remember the channel, so it's safe to just send an error_message here and drop the
1485                         // channel.
1486                         return Err(ChannelError::Close("Received funding_created after we got the channel!"));
1487                 }
1488                 if self.commitment_secrets.get_min_seen_secret() != (1 << 48) ||
1489                                 self.cur_remote_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER ||
1490                                 self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
1491                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1492                 }
1493
1494                 let funding_txo = OutPoint::new(msg.funding_txid, msg.funding_output_index);
1495                 self.funding_txo = Some(funding_txo.clone());
1496
1497                 let (remote_initial_commitment_tx, local_initial_commitment_tx, our_signature) = match self.funding_created_signature(&msg.signature) {
1498                         Ok(res) => res,
1499                         Err(e) => {
1500                                 self.funding_txo = None;
1501                                 return Err(e);
1502                         }
1503                 };
1504
1505                 // Now that we're past error-generating stuff, update our local state:
1506
1507                 let their_pubkeys = self.their_pubkeys.as_ref().unwrap();
1508                 let funding_redeemscript = self.get_funding_redeemscript();
1509                 let funding_txo_script = funding_redeemscript.to_v0_p2wsh();
1510                 macro_rules! create_monitor {
1511                         () => { {
1512                                 let mut channel_monitor = ChannelMonitor::new(self.local_keys.clone(),
1513                                                                               &self.shutdown_pubkey, self.our_to_self_delay,
1514                                                                               &self.destination_script, (funding_txo, funding_txo_script.clone()),
1515                                                                               &their_pubkeys.htlc_basepoint, &their_pubkeys.delayed_payment_basepoint,
1516                                                                               self.their_to_self_delay, funding_redeemscript.clone(), self.channel_value_satoshis,
1517                                                                               self.get_commitment_transaction_number_obscure_factor(),
1518                                                                               self.logger.clone());
1519
1520                                 channel_monitor.provide_latest_remote_commitment_tx_info(&remote_initial_commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number, self.their_cur_commitment_point.unwrap());
1521                                 channel_monitor.provide_latest_local_commitment_tx_info(local_initial_commitment_tx.clone(), Vec::new()).unwrap();
1522                                 channel_monitor
1523                         } }
1524                 }
1525
1526                 self.channel_monitor = Some(create_monitor!());
1527                 let channel_monitor = create_monitor!();
1528
1529                 self.channel_state = ChannelState::FundingSent as u32;
1530                 self.channel_id = funding_txo.to_channel_id();
1531                 self.cur_remote_commitment_transaction_number -= 1;
1532                 self.cur_local_commitment_transaction_number -= 1;
1533
1534                 Ok((msgs::FundingSigned {
1535                         channel_id: self.channel_id,
1536                         signature: our_signature
1537                 }, channel_monitor))
1538         }
1539
1540         /// Handles a funding_signed message from the remote end.
1541         /// If this call is successful, broadcast the funding transaction (and not before!)
1542         pub fn funding_signed(&mut self, msg: &msgs::FundingSigned) -> Result<ChannelMonitorUpdate, (Option<ChannelMonitorUpdate>, ChannelError)> {
1543                 if !self.channel_outbound {
1544                         return Err((None, ChannelError::Close("Received funding_signed for an inbound channel?")));
1545                 }
1546                 if self.channel_state & !(ChannelState::MonitorUpdateFailed as u32) != ChannelState::FundingCreated as u32 {
1547                         return Err((None, ChannelError::Close("Received funding_signed in strange state!")));
1548                 }
1549                 if self.commitment_secrets.get_min_seen_secret() != (1 << 48) ||
1550                                 self.cur_remote_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER - 1 ||
1551                                 self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
1552                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
1553                 }
1554
1555                 let funding_script = self.get_funding_redeemscript();
1556
1557                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number).map_err(|e| (None, e))?;
1558                 let local_initial_commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false, self.feerate_per_kw).0;
1559                 let local_sighash = hash_to_message!(&bip143::SighashComponents::new(&local_initial_commitment_tx).sighash_all(&local_initial_commitment_tx.input[0], &funding_script, self.channel_value_satoshis)[..]);
1560
1561                 let their_funding_pubkey = &self.their_pubkeys.as_ref().unwrap().funding_pubkey;
1562
1563                 // They sign the "local" commitment transaction, allowing us to broadcast the tx if we wish.
1564                 if let Err(_) = self.secp_ctx.verify(&local_sighash, &msg.signature, their_funding_pubkey) {
1565                         return Err((None, ChannelError::Close("Invalid funding_signed signature from peer")));
1566                 }
1567
1568                 self.latest_monitor_update_id += 1;
1569                 let monitor_update = ChannelMonitorUpdate {
1570                         update_id: self.latest_monitor_update_id,
1571                         updates: vec![ChannelMonitorUpdateStep::LatestLocalCommitmentTXInfo {
1572                                 commitment_tx: LocalCommitmentTransaction::new_missing_local_sig(local_initial_commitment_tx, &msg.signature, &PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.funding_key()), their_funding_pubkey, local_keys, self.feerate_per_kw, Vec::new()),
1573                                 htlc_outputs: Vec::new(),
1574                         }]
1575                 };
1576                 self.channel_monitor.as_mut().unwrap().update_monitor_ooo(monitor_update.clone()).unwrap();
1577                 self.channel_state = ChannelState::FundingSent as u32 | (self.channel_state & (ChannelState::MonitorUpdateFailed as u32));
1578                 self.cur_local_commitment_transaction_number -= 1;
1579
1580                 if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) == 0 {
1581                         Ok(monitor_update)
1582                 } else {
1583                         Err((Some(monitor_update),
1584                                 ChannelError::Ignore("Previous monitor update failure prevented funding_signed from allowing funding broadcast")))
1585                 }
1586         }
1587
1588         pub fn funding_locked(&mut self, msg: &msgs::FundingLocked) -> Result<(), ChannelError> {
1589                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1590                         return Err(ChannelError::Close("Peer sent funding_locked when we needed a channel_reestablish"));
1591                 }
1592
1593                 let non_shutdown_state = self.channel_state & (!MULTI_STATE_FLAGS);
1594
1595                 if non_shutdown_state == ChannelState::FundingSent as u32 {
1596                         self.channel_state |= ChannelState::TheirFundingLocked as u32;
1597                 } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
1598                         self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & MULTI_STATE_FLAGS);
1599                         self.update_time_counter += 1;
1600                 } else if (self.channel_state & (ChannelState::ChannelFunded as u32) != 0 &&
1601                                  // Note that funding_signed/funding_created will have decremented both by 1!
1602                                  self.cur_local_commitment_transaction_number == INITIAL_COMMITMENT_NUMBER - 1 &&
1603                                  self.cur_remote_commitment_transaction_number == INITIAL_COMMITMENT_NUMBER - 1) ||
1604                                 // If we reconnected before sending our funding locked they may still resend theirs:
1605                                 (self.channel_state & (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32) ==
1606                                                       (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32)) {
1607                         if self.their_cur_commitment_point != Some(msg.next_per_commitment_point) {
1608                                 return Err(ChannelError::Close("Peer sent a reconnect funding_locked with a different point"));
1609                         }
1610                         // They probably disconnected/reconnected and re-sent the funding_locked, which is required
1611                         return Ok(());
1612                 } else {
1613                         return Err(ChannelError::Close("Peer sent a funding_locked at a strange time"));
1614                 }
1615
1616                 self.their_prev_commitment_point = self.their_cur_commitment_point;
1617                 self.their_cur_commitment_point = Some(msg.next_per_commitment_point);
1618                 Ok(())
1619         }
1620
1621         /// Returns (inbound_htlc_count, htlc_inbound_value_msat)
1622         fn get_inbound_pending_htlc_stats(&self) -> (u32, u64) {
1623                 let mut htlc_inbound_value_msat = 0;
1624                 for ref htlc in self.pending_inbound_htlcs.iter() {
1625                         htlc_inbound_value_msat += htlc.amount_msat;
1626                 }
1627                 (self.pending_inbound_htlcs.len() as u32, htlc_inbound_value_msat)
1628         }
1629
1630         /// Returns (outbound_htlc_count, htlc_outbound_value_msat) *including* pending adds in our
1631         /// holding cell.
1632         fn get_outbound_pending_htlc_stats(&self) -> (u32, u64) {
1633                 let mut htlc_outbound_value_msat = 0;
1634                 for ref htlc in self.pending_outbound_htlcs.iter() {
1635                         htlc_outbound_value_msat += htlc.amount_msat;
1636                 }
1637
1638                 let mut htlc_outbound_count = self.pending_outbound_htlcs.len();
1639                 for update in self.holding_cell_htlc_updates.iter() {
1640                         if let &HTLCUpdateAwaitingACK::AddHTLC { ref amount_msat, .. } = update {
1641                                 htlc_outbound_count += 1;
1642                                 htlc_outbound_value_msat += amount_msat;
1643                         }
1644                 }
1645
1646                 (htlc_outbound_count as u32, htlc_outbound_value_msat)
1647         }
1648
1649         /// Get the available (ie not including pending HTLCs) inbound and outbound balance in msat.
1650         /// Doesn't bother handling the
1651         /// if-we-removed-it-already-but-haven't-fully-resolved-they-can-still-send-an-inbound-HTLC
1652         /// corner case properly.
1653         pub fn get_inbound_outbound_available_balance_msat(&self) -> (u64, u64) {
1654                 // Note that we have to handle overflow due to the above case.
1655                 (cmp::min(self.channel_value_satoshis as i64 * 1000 - self.value_to_self_msat as i64 - self.get_inbound_pending_htlc_stats().1 as i64, 0) as u64,
1656                 cmp::min(self.value_to_self_msat as i64 - self.get_outbound_pending_htlc_stats().1 as i64, 0) as u64)
1657         }
1658
1659         pub fn update_add_htlc(&mut self, msg: &msgs::UpdateAddHTLC, pending_forward_state: PendingHTLCStatus) -> Result<(), ChannelError> {
1660                 if (self.channel_state & (ChannelState::ChannelFunded as u32 | ChannelState::RemoteShutdownSent as u32)) != (ChannelState::ChannelFunded as u32) {
1661                         return Err(ChannelError::Close("Got add HTLC message when channel was not in an operational state"));
1662                 }
1663                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1664                         return Err(ChannelError::Close("Peer sent update_add_htlc when we needed a channel_reestablish"));
1665                 }
1666                 if msg.amount_msat > self.channel_value_satoshis * 1000 {
1667                         return Err(ChannelError::Close("Remote side tried to send more than the total value of the channel"));
1668                 }
1669                 if msg.amount_msat == 0 {
1670                         return Err(ChannelError::Close("Remote side tried to send a 0-msat HTLC"));
1671                 }
1672                 if msg.amount_msat < self.our_htlc_minimum_msat {
1673                         return Err(ChannelError::Close("Remote side tried to send less than our minimum HTLC value"));
1674                 }
1675
1676                 let (inbound_htlc_count, htlc_inbound_value_msat) = self.get_inbound_pending_htlc_stats();
1677                 if inbound_htlc_count + 1 > OUR_MAX_HTLCS as u32 {
1678                         return Err(ChannelError::Close("Remote tried to push more than our max accepted HTLCs"));
1679                 }
1680                 // Check our_max_htlc_value_in_flight_msat
1681                 if htlc_inbound_value_msat + msg.amount_msat > Channel::<ChanSigner>::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis) {
1682                         return Err(ChannelError::Close("Remote HTLC add would put them over our max HTLC value"));
1683                 }
1684                 // Check our_channel_reserve_satoshis (we're getting paid, so they have to at least meet
1685                 // the reserve_satoshis we told them to always have as direct payment so that they lose
1686                 // something if we punish them for broadcasting an old state).
1687                 // Note that we don't really care about having a small/no to_remote output in our local
1688                 // commitment transactions, as the purpose of the channel reserve is to ensure we can
1689                 // punish *them* if they misbehave, so we discount any outbound HTLCs which will not be
1690                 // present in the next commitment transaction we send them (at least for fulfilled ones,
1691                 // failed ones won't modify value_to_self).
1692                 // Note that we will send HTLCs which another instance of rust-lightning would think
1693                 // violate the reserve value if we do not do this (as we forget inbound HTLCs from the
1694                 // Channel state once they will not be present in the next received commitment
1695                 // transaction).
1696                 let mut removed_outbound_total_msat = 0;
1697                 for ref htlc in self.pending_outbound_htlcs.iter() {
1698                         if let OutboundHTLCState::AwaitingRemoteRevokeToRemove(None) = htlc.state {
1699                                 removed_outbound_total_msat += htlc.amount_msat;
1700                         } else if let OutboundHTLCState::AwaitingRemovedRemoteRevoke(None) = htlc.state {
1701                                 removed_outbound_total_msat += htlc.amount_msat;
1702                         }
1703                 }
1704                 if htlc_inbound_value_msat + msg.amount_msat + self.value_to_self_msat > (self.channel_value_satoshis - Channel::<ChanSigner>::get_our_channel_reserve_satoshis(self.channel_value_satoshis)) * 1000 + removed_outbound_total_msat {
1705                         return Err(ChannelError::Close("Remote HTLC add would put them over their reserve value"));
1706                 }
1707                 if self.next_remote_htlc_id != msg.htlc_id {
1708                         return Err(ChannelError::Close("Remote skipped HTLC ID"));
1709                 }
1710                 if msg.cltv_expiry >= 500000000 {
1711                         return Err(ChannelError::Close("Remote provided CLTV expiry in seconds instead of block height"));
1712                 }
1713
1714                 //TODO: Check msg.cltv_expiry further? Do this in channel manager?
1715
1716                 if self.channel_state & ChannelState::LocalShutdownSent as u32 != 0 {
1717                         if let PendingHTLCStatus::Forward(_) = pending_forward_state {
1718                                 panic!("ChannelManager shouldn't be trying to add a forwardable HTLC after we've started closing");
1719                         }
1720                 }
1721
1722                 // Now update local state:
1723                 self.next_remote_htlc_id += 1;
1724                 self.pending_inbound_htlcs.push(InboundHTLCOutput {
1725                         htlc_id: msg.htlc_id,
1726                         amount_msat: msg.amount_msat,
1727                         payment_hash: msg.payment_hash,
1728                         cltv_expiry: msg.cltv_expiry,
1729                         state: InboundHTLCState::RemoteAnnounced(pending_forward_state),
1730                 });
1731                 Ok(())
1732         }
1733
1734         /// Marks an outbound HTLC which we have received update_fail/fulfill/malformed
1735         #[inline]
1736         fn mark_outbound_htlc_removed(&mut self, htlc_id: u64, check_preimage: Option<PaymentHash>, fail_reason: Option<HTLCFailReason>) -> Result<&HTLCSource, ChannelError> {
1737                 for htlc in self.pending_outbound_htlcs.iter_mut() {
1738                         if htlc.htlc_id == htlc_id {
1739                                 match check_preimage {
1740                                         None => {},
1741                                         Some(payment_hash) =>
1742                                                 if payment_hash != htlc.payment_hash {
1743                                                         return Err(ChannelError::Close("Remote tried to fulfill HTLC with an incorrect preimage"));
1744                                                 }
1745                                 };
1746                                 match htlc.state {
1747                                         OutboundHTLCState::LocalAnnounced(_) =>
1748                                                 return Err(ChannelError::Close("Remote tried to fulfill/fail HTLC before it had been committed")),
1749                                         OutboundHTLCState::Committed => {
1750                                                 htlc.state = OutboundHTLCState::RemoteRemoved(fail_reason);
1751                                         },
1752                                         OutboundHTLCState::AwaitingRemoteRevokeToRemove(_) | OutboundHTLCState::AwaitingRemovedRemoteRevoke(_) | OutboundHTLCState::RemoteRemoved(_) =>
1753                                                 return Err(ChannelError::Close("Remote tried to fulfill/fail HTLC that they'd already fulfilled/failed")),
1754                                 }
1755                                 return Ok(&htlc.source);
1756                         }
1757                 }
1758                 Err(ChannelError::Close("Remote tried to fulfill/fail an HTLC we couldn't find"))
1759         }
1760
1761         pub fn update_fulfill_htlc(&mut self, msg: &msgs::UpdateFulfillHTLC) -> Result<HTLCSource, ChannelError> {
1762                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1763                         return Err(ChannelError::Close("Got fulfill HTLC message when channel was not in an operational state"));
1764                 }
1765                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1766                         return Err(ChannelError::Close("Peer sent update_fulfill_htlc when we needed a channel_reestablish"));
1767                 }
1768
1769                 let payment_hash = PaymentHash(Sha256::hash(&msg.payment_preimage.0[..]).into_inner());
1770                 self.mark_outbound_htlc_removed(msg.htlc_id, Some(payment_hash), None).map(|source| source.clone())
1771         }
1772
1773         pub fn update_fail_htlc(&mut self, msg: &msgs::UpdateFailHTLC, fail_reason: HTLCFailReason) -> Result<(), ChannelError> {
1774                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1775                         return Err(ChannelError::Close("Got fail HTLC message when channel was not in an operational state"));
1776                 }
1777                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1778                         return Err(ChannelError::Close("Peer sent update_fail_htlc when we needed a channel_reestablish"));
1779                 }
1780
1781                 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))?;
1782                 Ok(())
1783         }
1784
1785         pub fn update_fail_malformed_htlc<'a>(&mut self, msg: &msgs::UpdateFailMalformedHTLC, fail_reason: HTLCFailReason) -> Result<(), ChannelError> {
1786                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1787                         return Err(ChannelError::Close("Got fail malformed HTLC message when channel was not in an operational state"));
1788                 }
1789                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1790                         return Err(ChannelError::Close("Peer sent update_fail_malformed_htlc when we needed a channel_reestablish"));
1791                 }
1792
1793                 self.mark_outbound_htlc_removed(msg.htlc_id, None, Some(fail_reason))?;
1794                 Ok(())
1795         }
1796
1797         pub fn commitment_signed<F: Deref>(&mut self, msg: &msgs::CommitmentSigned, fee_estimator: &F) -> Result<(msgs::RevokeAndACK, Option<msgs::CommitmentSigned>, Option<msgs::ClosingSigned>, ChannelMonitorUpdate), (Option<ChannelMonitorUpdate>, ChannelError)> where F::Target: FeeEstimator {
1798                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
1799                         return Err((None, ChannelError::Close("Got commitment signed message when channel was not in an operational state")));
1800                 }
1801                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
1802                         return Err((None, ChannelError::Close("Peer sent commitment_signed when we needed a channel_reestablish")));
1803                 }
1804                 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK == BOTH_SIDES_SHUTDOWN_MASK && self.last_sent_closing_fee.is_some() {
1805                         return Err((None, ChannelError::Close("Peer sent commitment_signed after we'd started exchanging closing_signeds")));
1806                 }
1807
1808                 let funding_script = self.get_funding_redeemscript();
1809
1810                 let local_keys = self.build_local_transaction_keys(self.cur_local_commitment_transaction_number).map_err(|e| (None, e))?;
1811
1812                 let mut update_fee = false;
1813                 let feerate_per_kw = if !self.channel_outbound && self.pending_update_fee.is_some() {
1814                         update_fee = true;
1815                         self.pending_update_fee.unwrap()
1816                 } else {
1817                         self.feerate_per_kw
1818                 };
1819
1820                 let mut local_commitment_tx = {
1821                         let mut commitment_tx = self.build_commitment_transaction(self.cur_local_commitment_transaction_number, &local_keys, true, false, feerate_per_kw);
1822                         let htlcs_cloned: Vec<_> = commitment_tx.2.drain(..).map(|htlc| (htlc.0, htlc.1.map(|h| h.clone()))).collect();
1823                         (commitment_tx.0, commitment_tx.1, htlcs_cloned)
1824                 };
1825                 let local_commitment_txid = local_commitment_tx.0.txid();
1826                 let local_sighash = hash_to_message!(&bip143::SighashComponents::new(&local_commitment_tx.0).sighash_all(&local_commitment_tx.0.input[0], &funding_script, self.channel_value_satoshis)[..]);
1827                 log_trace!(self, "Checking commitment tx signature {} by key {} against tx {} with redeemscript {}", log_bytes!(msg.signature.serialize_compact()[..]), log_bytes!(self.their_funding_pubkey().serialize()), encode::serialize_hex(&local_commitment_tx.0), encode::serialize_hex(&funding_script));
1828                 if let Err(_) = self.secp_ctx.verify(&local_sighash, &msg.signature, &self.their_funding_pubkey()) {
1829                         return Err((None, ChannelError::Close("Invalid commitment tx signature from peer")));
1830                 }
1831
1832                 //If channel fee was updated by funder confirm funder can afford the new fee rate when applied to the current local commitment transaction
1833                 if update_fee {
1834                         let num_htlcs = local_commitment_tx.1;
1835                         let total_fee: u64 = feerate_per_kw as u64 * (COMMITMENT_TX_BASE_WEIGHT + (num_htlcs as u64) * COMMITMENT_TX_WEIGHT_PER_HTLC) / 1000;
1836
1837                         if self.channel_value_satoshis - self.value_to_self_msat / 1000 < total_fee + self.their_channel_reserve_satoshis {
1838                                 return Err((None, ChannelError::Close("Funding remote cannot afford proposed new fee")));
1839                         }
1840                 }
1841
1842                 if msg.htlc_signatures.len() != local_commitment_tx.1 {
1843                         return Err((None, ChannelError::Close("Got wrong number of HTLC signatures from remote")));
1844                 }
1845
1846                 // TODO: Merge these two, sadly they are currently both required to be passed separately to
1847                 // ChannelMonitor:
1848                 let mut htlcs_without_source = Vec::with_capacity(local_commitment_tx.2.len());
1849                 let mut htlcs_and_sigs = Vec::with_capacity(local_commitment_tx.2.len());
1850                 for (idx, (htlc, source)) in local_commitment_tx.2.drain(..).enumerate() {
1851                         if let Some(_) = htlc.transaction_output_index {
1852                                 let htlc_tx = self.build_htlc_transaction(&local_commitment_txid, &htlc, true, &local_keys, feerate_per_kw);
1853                                 let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &local_keys);
1854                                 log_trace!(self, "Checking HTLC tx signature {} by key {} against tx {} with redeemscript {}", log_bytes!(msg.htlc_signatures[idx].serialize_compact()[..]), log_bytes!(local_keys.b_htlc_key.serialize()), encode::serialize_hex(&htlc_tx), encode::serialize_hex(&htlc_redeemscript));
1855                                 let htlc_sighash = hash_to_message!(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]);
1856                                 if let Err(_) = self.secp_ctx.verify(&htlc_sighash, &msg.htlc_signatures[idx], &local_keys.b_htlc_key) {
1857                                         return Err((None, ChannelError::Close("Invalid HTLC tx signature from peer")));
1858                                 }
1859                                 htlcs_without_source.push((htlc.clone(), Some(msg.htlc_signatures[idx])));
1860                                 htlcs_and_sigs.push((htlc, Some(msg.htlc_signatures[idx]), source));
1861                         } else {
1862                                 htlcs_without_source.push((htlc.clone(), None));
1863                                 htlcs_and_sigs.push((htlc, None, source));
1864                         }
1865                 }
1866
1867                 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number - 1));
1868                 let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed(), self.cur_local_commitment_transaction_number + 1);
1869
1870                 // Update state now that we've passed all the can-fail calls...
1871                 let mut need_our_commitment = false;
1872                 if !self.channel_outbound {
1873                         if let Some(fee_update) = self.pending_update_fee {
1874                                 self.feerate_per_kw = fee_update;
1875                                 // We later use the presence of pending_update_fee to indicate we should generate a
1876                                 // commitment_signed upon receipt of revoke_and_ack, so we can only set it to None
1877                                 // if we're not awaiting a revoke (ie will send a commitment_signed now).
1878                                 if (self.channel_state & ChannelState::AwaitingRemoteRevoke as u32) == 0 {
1879                                         need_our_commitment = true;
1880                                         self.pending_update_fee = None;
1881                                 }
1882                         }
1883                 }
1884
1885                 let their_funding_pubkey = self.their_pubkeys.as_ref().unwrap().funding_pubkey;
1886
1887                 self.latest_monitor_update_id += 1;
1888                 let mut monitor_update = ChannelMonitorUpdate {
1889                         update_id: self.latest_monitor_update_id,
1890                         updates: vec![ChannelMonitorUpdateStep::LatestLocalCommitmentTXInfo {
1891                                 commitment_tx: LocalCommitmentTransaction::new_missing_local_sig(local_commitment_tx.0, &msg.signature, &PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.funding_key()), &their_funding_pubkey, local_keys, self.feerate_per_kw, htlcs_without_source),
1892                                 htlc_outputs: htlcs_and_sigs
1893                         }]
1894                 };
1895                 self.channel_monitor.as_mut().unwrap().update_monitor_ooo(monitor_update.clone()).unwrap();
1896
1897                 for htlc in self.pending_inbound_htlcs.iter_mut() {
1898                         let new_forward = if let &InboundHTLCState::RemoteAnnounced(ref forward_info) = &htlc.state {
1899                                 Some(forward_info.clone())
1900                         } else { None };
1901                         if let Some(forward_info) = new_forward {
1902                                 htlc.state = InboundHTLCState::AwaitingRemoteRevokeToAnnounce(forward_info);
1903                                 need_our_commitment = true;
1904                         }
1905                 }
1906                 for htlc in self.pending_outbound_htlcs.iter_mut() {
1907                         if let Some(fail_reason) = if let &mut OutboundHTLCState::RemoteRemoved(ref mut fail_reason) = &mut htlc.state {
1908                                 Some(fail_reason.take())
1909                         } else { None } {
1910                                 htlc.state = OutboundHTLCState::AwaitingRemoteRevokeToRemove(fail_reason);
1911                                 need_our_commitment = true;
1912                         }
1913                 }
1914
1915                 self.cur_local_commitment_transaction_number -= 1;
1916                 // Note that if we need_our_commitment & !AwaitingRemoteRevoke we'll call
1917                 // send_commitment_no_status_check() next which will reset this to RAAFirst.
1918                 self.resend_order = RAACommitmentOrder::CommitmentFirst;
1919
1920                 if (self.channel_state & ChannelState::MonitorUpdateFailed as u32) != 0 {
1921                         // In case we initially failed monitor updating without requiring a response, we need
1922                         // to make sure the RAA gets sent first.
1923                         self.monitor_pending_revoke_and_ack = true;
1924                         if need_our_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
1925                                 // If we were going to send a commitment_signed after the RAA, go ahead and do all
1926                                 // the corresponding HTLC status updates so that get_last_commitment_update
1927                                 // includes the right HTLCs.
1928                                 self.monitor_pending_commitment_signed = true;
1929                                 let (_, mut additional_update) = self.send_commitment_no_status_check().map_err(|e| (None, e))?;
1930                                 // send_commitment_no_status_check may bump latest_monitor_id but we want them to be
1931                                 // strictly increasing by one, so decrement it here.
1932                                 self.latest_monitor_update_id = monitor_update.update_id;
1933                                 monitor_update.updates.append(&mut additional_update.updates);
1934                         }
1935                         // TODO: Call maybe_propose_first_closing_signed on restoration (or call it here and
1936                         // re-send the message on restoration)
1937                         return Err((Some(monitor_update), ChannelError::Ignore("Previous monitor update failure prevented generation of RAA")));
1938                 }
1939
1940                 let (our_commitment_signed, closing_signed) = if need_our_commitment && (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == 0 {
1941                         // If we're AwaitingRemoteRevoke we can't send a new commitment here, but that's ok -
1942                         // we'll send one right away when we get the revoke_and_ack when we
1943                         // free_holding_cell_htlcs().
1944                         let (msg, mut additional_update) = self.send_commitment_no_status_check().map_err(|e| (None, e))?;
1945                         // send_commitment_no_status_check may bump latest_monitor_id but we want them to be
1946                         // strictly increasing by one, so decrement it here.
1947                         self.latest_monitor_update_id = monitor_update.update_id;
1948                         monitor_update.updates.append(&mut additional_update.updates);
1949                         (Some(msg), None)
1950                 } else if !need_our_commitment {
1951                         (None, self.maybe_propose_first_closing_signed(fee_estimator))
1952                 } else { (None, None) };
1953
1954                 Ok((msgs::RevokeAndACK {
1955                         channel_id: self.channel_id,
1956                         per_commitment_secret: per_commitment_secret,
1957                         next_per_commitment_point: next_per_commitment_point,
1958                 }, our_commitment_signed, closing_signed, monitor_update))
1959         }
1960
1961         /// Used to fulfill holding_cell_htlcs when we get a remote ack (or implicitly get it by them
1962         /// fulfilling or failing the last pending HTLC)
1963         fn free_holding_cell_htlcs(&mut self) -> Result<Option<(msgs::CommitmentUpdate, ChannelMonitorUpdate)>, ChannelError> {
1964                 assert_eq!(self.channel_state & ChannelState::MonitorUpdateFailed as u32, 0);
1965                 if self.holding_cell_htlc_updates.len() != 0 || self.holding_cell_update_fee.is_some() {
1966                         log_trace!(self, "Freeing holding cell with {} HTLC updates{}", self.holding_cell_htlc_updates.len(), if self.holding_cell_update_fee.is_some() { " and a fee update" } else { "" });
1967
1968                         let mut monitor_update = ChannelMonitorUpdate {
1969                                 update_id: self.latest_monitor_update_id + 1, // We don't increment this yet!
1970                                 updates: Vec::new(),
1971                         };
1972
1973                         let mut htlc_updates = Vec::new();
1974                         mem::swap(&mut htlc_updates, &mut self.holding_cell_htlc_updates);
1975                         let mut update_add_htlcs = Vec::with_capacity(htlc_updates.len());
1976                         let mut update_fulfill_htlcs = Vec::with_capacity(htlc_updates.len());
1977                         let mut update_fail_htlcs = Vec::with_capacity(htlc_updates.len());
1978                         let mut err = None;
1979                         for htlc_update in htlc_updates.drain(..) {
1980                                 // Note that this *can* fail, though it should be due to rather-rare conditions on
1981                                 // fee races with adding too many outputs which push our total payments just over
1982                                 // the limit. In case it's less rare than I anticipate, we may want to revisit
1983                                 // handling this case better and maybe fulfilling some of the HTLCs while attempting
1984                                 // to rebalance channels.
1985                                 if err.is_some() { // We're back to AwaitingRemoteRevoke (or are about to fail the channel)
1986                                         self.holding_cell_htlc_updates.push(htlc_update);
1987                                 } else {
1988                                         match &htlc_update {
1989                                                 &HTLCUpdateAwaitingACK::AddHTLC {amount_msat, cltv_expiry, ref payment_hash, ref source, ref onion_routing_packet, ..} => {
1990                                                         match self.send_htlc(amount_msat, *payment_hash, cltv_expiry, source.clone(), onion_routing_packet.clone()) {
1991                                                                 Ok(update_add_msg_option) => update_add_htlcs.push(update_add_msg_option.unwrap()),
1992                                                                 Err(e) => {
1993                                                                         match e {
1994                                                                                 ChannelError::Ignore(ref msg) => {
1995                                                                                         log_info!(self, "Failed to send HTLC with payment_hash {} due to {}", log_bytes!(payment_hash.0), msg);
1996                                                                                 },
1997                                                                                 _ => {
1998                                                                                         log_info!(self, "Failed to send HTLC with payment_hash {} resulting in a channel closure during holding_cell freeing", log_bytes!(payment_hash.0));
1999                                                                                 },
2000                                                                         }
2001                                                                         err = Some(e);
2002                                                                 }
2003                                                         }
2004                                                 },
2005                                                 &HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_preimage, htlc_id, .. } => {
2006                                                         match self.get_update_fulfill_htlc(htlc_id, *payment_preimage) {
2007                                                                 Ok((update_fulfill_msg_option, additional_monitor_update_opt)) => {
2008                                                                         update_fulfill_htlcs.push(update_fulfill_msg_option.unwrap());
2009                                                                         if let Some(mut additional_monitor_update) = additional_monitor_update_opt {
2010                                                                                 monitor_update.updates.append(&mut additional_monitor_update.updates);
2011                                                                         }
2012                                                                 },
2013                                                                 Err(e) => {
2014                                                                         if let ChannelError::Ignore(_) = e {}
2015                                                                         else {
2016                                                                                 panic!("Got a non-IgnoreError action trying to fulfill holding cell HTLC");
2017                                                                         }
2018                                                                 }
2019                                                         }
2020                                                 },
2021                                                 &HTLCUpdateAwaitingACK::FailHTLC { htlc_id, ref err_packet } => {
2022                                                         match self.get_update_fail_htlc(htlc_id, err_packet.clone()) {
2023                                                                 Ok(update_fail_msg_option) => update_fail_htlcs.push(update_fail_msg_option.unwrap()),
2024                                                                 Err(e) => {
2025                                                                         if let ChannelError::Ignore(_) = e {}
2026                                                                         else {
2027                                                                                 panic!("Got a non-IgnoreError action trying to fail holding cell HTLC");
2028                                                                         }
2029                                                                 }
2030                                                         }
2031                                                 },
2032                                         }
2033                                         if err.is_some() {
2034                                                 self.holding_cell_htlc_updates.push(htlc_update);
2035                                                 if let Some(ChannelError::Ignore(_)) = err {
2036                                                         // If we failed to add the HTLC, but got an Ignore error, we should
2037                                                         // still send the new commitment_signed, so reset the err to None.
2038                                                         err = None;
2039                                                 }
2040                                         }
2041                                 }
2042                         }
2043                         //TODO: Need to examine the type of err - if it's a fee issue or similar we may want to
2044                         //fail it back the route, if it's a temporary issue we can ignore it...
2045                         match err {
2046                                 None => {
2047                                         if update_add_htlcs.is_empty() && update_fulfill_htlcs.is_empty() && update_fail_htlcs.is_empty() && self.holding_cell_update_fee.is_none() {
2048                                                 // This should never actually happen and indicates we got some Errs back
2049                                                 // from update_fulfill_htlc/update_fail_htlc, but we handle it anyway in
2050                                                 // case there is some strange way to hit duplicate HTLC removes.
2051                                                 return Ok(None);
2052                                         }
2053                                         let update_fee = if let Some(feerate) = self.holding_cell_update_fee {
2054                                                         self.pending_update_fee = self.holding_cell_update_fee.take();
2055                                                         Some(msgs::UpdateFee {
2056                                                                 channel_id: self.channel_id,
2057                                                                 feerate_per_kw: feerate as u32,
2058                                                         })
2059                                                 } else {
2060                                                         None
2061                                                 };
2062
2063                                         let (commitment_signed, mut additional_update) = self.send_commitment_no_status_check()?;
2064                                         // send_commitment_no_status_check and get_update_fulfill_htlc may bump latest_monitor_id
2065                                         // but we want them to be strictly increasing by one, so reset it here.
2066                                         self.latest_monitor_update_id = monitor_update.update_id;
2067                                         monitor_update.updates.append(&mut additional_update.updates);
2068
2069                                         Ok(Some((msgs::CommitmentUpdate {
2070                                                 update_add_htlcs,
2071                                                 update_fulfill_htlcs,
2072                                                 update_fail_htlcs,
2073                                                 update_fail_malformed_htlcs: Vec::new(),
2074                                                 update_fee: update_fee,
2075                                                 commitment_signed,
2076                                         }, monitor_update)))
2077                                 },
2078                                 Some(e) => Err(e)
2079                         }
2080                 } else {
2081                         Ok(None)
2082                 }
2083         }
2084
2085         /// Handles receiving a remote's revoke_and_ack. Note that we may return a new
2086         /// commitment_signed message here in case we had pending outbound HTLCs to add which were
2087         /// waiting on this revoke_and_ack. The generation of this new commitment_signed may also fail,
2088         /// generating an appropriate error *after* the channel state has been updated based on the
2089         /// revoke_and_ack message.
2090         pub fn revoke_and_ack<F: Deref>(&mut self, msg: &msgs::RevokeAndACK, fee_estimator: &F) -> Result<(Option<msgs::CommitmentUpdate>, Vec<(PendingHTLCInfo, u64)>, Vec<(HTLCSource, PaymentHash, HTLCFailReason)>, Option<msgs::ClosingSigned>, ChannelMonitorUpdate), ChannelError>
2091                 where F::Target: FeeEstimator
2092         {
2093                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
2094                         return Err(ChannelError::Close("Got revoke/ACK message when channel was not in an operational state"));
2095                 }
2096                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2097                         return Err(ChannelError::Close("Peer sent revoke_and_ack when we needed a channel_reestablish"));
2098                 }
2099                 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK == BOTH_SIDES_SHUTDOWN_MASK && self.last_sent_closing_fee.is_some() {
2100                         return Err(ChannelError::Close("Peer sent revoke_and_ack after we'd started exchanging closing_signeds"));
2101                 }
2102
2103                 if let Some(their_prev_commitment_point) = self.their_prev_commitment_point {
2104                         if PublicKey::from_secret_key(&self.secp_ctx, &secp_check!(SecretKey::from_slice(&msg.per_commitment_secret), "Peer provided an invalid per_commitment_secret")) != their_prev_commitment_point {
2105                                 return Err(ChannelError::Close("Got a revoke commitment secret which didn't correspond to their current pubkey"));
2106                         }
2107                 }
2108
2109                 if self.channel_state & ChannelState::AwaitingRemoteRevoke as u32 == 0 {
2110                         // Our counterparty seems to have burned their coins to us (by revoking a state when we
2111                         // haven't given them a new commitment transaction to broadcast). We should probably
2112                         // take advantage of this by updating our channel monitor, sending them an error, and
2113                         // waiting for them to broadcast their latest (now-revoked claim). But, that would be a
2114                         // lot of work, and there's some chance this is all a misunderstanding anyway.
2115                         // We have to do *something*, though, since our signer may get mad at us for otherwise
2116                         // jumping a remote commitment number, so best to just force-close and move on.
2117                         return Err(ChannelError::Close("Received an unexpected revoke_and_ack"));
2118                 }
2119
2120                 self.commitment_secrets.provide_secret(self.cur_remote_commitment_transaction_number + 1, msg.per_commitment_secret)
2121                         .map_err(|_| ChannelError::Close("Previous secrets did not match new one"))?;
2122                 self.latest_monitor_update_id += 1;
2123                 let mut monitor_update = ChannelMonitorUpdate {
2124                         update_id: self.latest_monitor_update_id,
2125                         updates: vec![ChannelMonitorUpdateStep::CommitmentSecret {
2126                                 idx: self.cur_remote_commitment_transaction_number + 1,
2127                                 secret: msg.per_commitment_secret,
2128                         }],
2129                 };
2130                 self.channel_monitor.as_mut().unwrap().update_monitor_ooo(monitor_update.clone()).unwrap();
2131
2132                 // Update state now that we've passed all the can-fail calls...
2133                 // (note that we may still fail to generate the new commitment_signed message, but that's
2134                 // OK, we step the channel here and *then* if the new generation fails we can fail the
2135                 // channel based on that, but stepping stuff here should be safe either way.
2136                 self.channel_state &= !(ChannelState::AwaitingRemoteRevoke as u32);
2137                 self.their_prev_commitment_point = self.their_cur_commitment_point;
2138                 self.their_cur_commitment_point = Some(msg.next_per_commitment_point);
2139                 self.cur_remote_commitment_transaction_number -= 1;
2140
2141                 log_trace!(self, "Updating HTLCs on receipt of RAA...");
2142                 let mut to_forward_infos = Vec::new();
2143                 let mut revoked_htlcs = Vec::new();
2144                 let mut update_fail_htlcs = Vec::new();
2145                 let mut update_fail_malformed_htlcs = Vec::new();
2146                 let mut require_commitment = false;
2147                 let mut value_to_self_msat_diff: i64 = 0;
2148
2149                 {
2150                         // Take references explicitly so that we can hold multiple references to self.
2151                         let pending_inbound_htlcs: &mut Vec<_> = &mut self.pending_inbound_htlcs;
2152                         let pending_outbound_htlcs: &mut Vec<_> = &mut self.pending_outbound_htlcs;
2153                         let logger = LogHolder { logger: &self.logger };
2154
2155                         // We really shouldnt have two passes here, but retain gives a non-mutable ref (Rust bug)
2156                         pending_inbound_htlcs.retain(|htlc| {
2157                                 if let &InboundHTLCState::LocalRemoved(ref reason) = &htlc.state {
2158                                         log_trace!(logger, " ...removing inbound LocalRemoved {}", log_bytes!(htlc.payment_hash.0));
2159                                         if let &InboundHTLCRemovalReason::Fulfill(_) = reason {
2160                                                 value_to_self_msat_diff += htlc.amount_msat as i64;
2161                                         }
2162                                         false
2163                                 } else { true }
2164                         });
2165                         pending_outbound_htlcs.retain(|htlc| {
2166                                 if let &OutboundHTLCState::AwaitingRemovedRemoteRevoke(ref fail_reason) = &htlc.state {
2167                                         log_trace!(logger, " ...removing outbound AwaitingRemovedRemoteRevoke {}", log_bytes!(htlc.payment_hash.0));
2168                                         if let Some(reason) = fail_reason.clone() { // We really want take() here, but, again, non-mut ref :(
2169                                                 revoked_htlcs.push((htlc.source.clone(), htlc.payment_hash, reason));
2170                                         } else {
2171                                                 // They fulfilled, so we sent them money
2172                                                 value_to_self_msat_diff -= htlc.amount_msat as i64;
2173                                         }
2174                                         false
2175                                 } else { true }
2176                         });
2177                         for htlc in pending_inbound_htlcs.iter_mut() {
2178                                 let swap = if let &InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_) = &htlc.state {
2179                                         log_trace!(logger, " ...promoting inbound AwaitingRemoteRevokeToAnnounce {} to Committed", log_bytes!(htlc.payment_hash.0));
2180                                         true
2181                                 } else if let &InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) = &htlc.state {
2182                                         log_trace!(logger, " ...promoting inbound AwaitingAnnouncedRemoteRevoke {} to Committed", log_bytes!(htlc.payment_hash.0));
2183                                         true
2184                                 } else { false };
2185                                 if swap {
2186                                         let mut state = InboundHTLCState::Committed;
2187                                         mem::swap(&mut state, &mut htlc.state);
2188
2189                                         if let InboundHTLCState::AwaitingRemoteRevokeToAnnounce(forward_info) = state {
2190                                                 htlc.state = InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info);
2191                                                 require_commitment = true;
2192                                         } else if let InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info) = state {
2193                                                 match forward_info {
2194                                                         PendingHTLCStatus::Fail(fail_msg) => {
2195                                                                 require_commitment = true;
2196                                                                 match fail_msg {
2197                                                                         HTLCFailureMsg::Relay(msg) => {
2198                                                                                 htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailRelay(msg.reason.clone()));
2199                                                                                 update_fail_htlcs.push(msg)
2200                                                                         },
2201                                                                         HTLCFailureMsg::Malformed(msg) => {
2202                                                                                 htlc.state = InboundHTLCState::LocalRemoved(InboundHTLCRemovalReason::FailMalformed((msg.sha256_of_onion, msg.failure_code)));
2203                                                                                 update_fail_malformed_htlcs.push(msg)
2204                                                                         },
2205                                                                 }
2206                                                         },
2207                                                         PendingHTLCStatus::Forward(forward_info) => {
2208                                                                 to_forward_infos.push((forward_info, htlc.htlc_id));
2209                                                                 htlc.state = InboundHTLCState::Committed;
2210                                                         }
2211                                                 }
2212                                         }
2213                                 }
2214                         }
2215                         for htlc in pending_outbound_htlcs.iter_mut() {
2216                                 if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
2217                                         log_trace!(logger, " ...promoting outbound LocalAnnounced {} to Committed", log_bytes!(htlc.payment_hash.0));
2218                                         htlc.state = OutboundHTLCState::Committed;
2219                                 }
2220                                 if let Some(fail_reason) = if let &mut OutboundHTLCState::AwaitingRemoteRevokeToRemove(ref mut fail_reason) = &mut htlc.state {
2221                                         Some(fail_reason.take())
2222                                 } else { None } {
2223                                         log_trace!(logger, " ...promoting outbound AwaitingRemoteRevokeToRemove {} to AwaitingRemovedRemoteRevoke", log_bytes!(htlc.payment_hash.0));
2224                                         htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke(fail_reason);
2225                                         require_commitment = true;
2226                                 }
2227                         }
2228                 }
2229                 self.value_to_self_msat = (self.value_to_self_msat as i64 + value_to_self_msat_diff) as u64;
2230
2231                 if self.channel_outbound {
2232                         if let Some(feerate) = self.pending_update_fee.take() {
2233                                 self.feerate_per_kw = feerate;
2234                         }
2235                 } else {
2236                         if let Some(feerate) = self.pending_update_fee {
2237                                 // Because a node cannot send two commitment_signeds in a row without getting a
2238                                 // revoke_and_ack from us (as it would otherwise not know the per_commitment_point
2239                                 // it should use to create keys with) and because a node can't send a
2240                                 // commitment_signed without changes, checking if the feerate is equal to the
2241                                 // pending feerate update is sufficient to detect require_commitment.
2242                                 if feerate == self.feerate_per_kw {
2243                                         require_commitment = true;
2244                                         self.pending_update_fee = None;
2245                                 }
2246                         }
2247                 }
2248
2249                 if (self.channel_state & ChannelState::MonitorUpdateFailed as u32) == ChannelState::MonitorUpdateFailed as u32 {
2250                         // We can't actually generate a new commitment transaction (incl by freeing holding
2251                         // cells) while we can't update the monitor, so we just return what we have.
2252                         if require_commitment {
2253                                 self.monitor_pending_commitment_signed = true;
2254                                 // When the monitor updating is restored we'll call get_last_commitment_update(),
2255                                 // which does not update state, but we're definitely now awaiting a remote revoke
2256                                 // before we can step forward any more, so set it here.
2257                                 let (_, mut additional_update) = self.send_commitment_no_status_check()?;
2258                                 // send_commitment_no_status_check may bump latest_monitor_id but we want them to be
2259                                 // strictly increasing by one, so decrement it here.
2260                                 self.latest_monitor_update_id = monitor_update.update_id;
2261                                 monitor_update.updates.append(&mut additional_update.updates);
2262                         }
2263                         self.monitor_pending_forwards.append(&mut to_forward_infos);
2264                         self.monitor_pending_failures.append(&mut revoked_htlcs);
2265                         return Ok((None, Vec::new(), Vec::new(), None, monitor_update))
2266                 }
2267
2268                 match self.free_holding_cell_htlcs()? {
2269                         Some((mut commitment_update, mut additional_update)) => {
2270                                 commitment_update.update_fail_htlcs.reserve(update_fail_htlcs.len());
2271                                 for fail_msg in update_fail_htlcs.drain(..) {
2272                                         commitment_update.update_fail_htlcs.push(fail_msg);
2273                                 }
2274                                 commitment_update.update_fail_malformed_htlcs.reserve(update_fail_malformed_htlcs.len());
2275                                 for fail_msg in update_fail_malformed_htlcs.drain(..) {
2276                                         commitment_update.update_fail_malformed_htlcs.push(fail_msg);
2277                                 }
2278
2279                                 // free_holding_cell_htlcs may bump latest_monitor_id multiple times but we want them to be
2280                                 // strictly increasing by one, so decrement it here.
2281                                 self.latest_monitor_update_id = monitor_update.update_id;
2282                                 monitor_update.updates.append(&mut additional_update.updates);
2283
2284                                 Ok((Some(commitment_update), to_forward_infos, revoked_htlcs, None, monitor_update))
2285                         },
2286                         None => {
2287                                 if require_commitment {
2288                                         let (commitment_signed, mut additional_update) = self.send_commitment_no_status_check()?;
2289
2290                                         // send_commitment_no_status_check may bump latest_monitor_id but we want them to be
2291                                         // strictly increasing by one, so decrement it here.
2292                                         self.latest_monitor_update_id = monitor_update.update_id;
2293                                         monitor_update.updates.append(&mut additional_update.updates);
2294
2295                                         Ok((Some(msgs::CommitmentUpdate {
2296                                                 update_add_htlcs: Vec::new(),
2297                                                 update_fulfill_htlcs: Vec::new(),
2298                                                 update_fail_htlcs,
2299                                                 update_fail_malformed_htlcs,
2300                                                 update_fee: None,
2301                                                 commitment_signed
2302                                         }), to_forward_infos, revoked_htlcs, None, monitor_update))
2303                                 } else {
2304                                         Ok((None, to_forward_infos, revoked_htlcs, self.maybe_propose_first_closing_signed(fee_estimator), monitor_update))
2305                                 }
2306                         }
2307                 }
2308
2309         }
2310
2311         /// Adds a pending update to this channel. See the doc for send_htlc for
2312         /// further details on the optionness of the return value.
2313         /// You MUST call send_commitment prior to any other calls on this Channel
2314         fn send_update_fee(&mut self, feerate_per_kw: u64) -> Option<msgs::UpdateFee> {
2315                 if !self.channel_outbound {
2316                         panic!("Cannot send fee from inbound channel");
2317                 }
2318                 if !self.is_usable() {
2319                         panic!("Cannot update fee until channel is fully established and we haven't started shutting down");
2320                 }
2321                 if !self.is_live() {
2322                         panic!("Cannot update fee while peer is disconnected/we're awaiting a monitor update (ChannelManager should have caught this)");
2323                 }
2324
2325                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
2326                         self.holding_cell_update_fee = Some(feerate_per_kw);
2327                         return None;
2328                 }
2329
2330                 debug_assert!(self.pending_update_fee.is_none());
2331                 self.pending_update_fee = Some(feerate_per_kw);
2332
2333                 Some(msgs::UpdateFee {
2334                         channel_id: self.channel_id,
2335                         feerate_per_kw: feerate_per_kw as u32,
2336                 })
2337         }
2338
2339         pub fn send_update_fee_and_commit(&mut self, feerate_per_kw: u64) -> Result<Option<(msgs::UpdateFee, msgs::CommitmentSigned, ChannelMonitorUpdate)>, ChannelError> {
2340                 match self.send_update_fee(feerate_per_kw) {
2341                         Some(update_fee) => {
2342                                 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
2343                                 Ok(Some((update_fee, commitment_signed, monitor_update)))
2344                         },
2345                         None => Ok(None)
2346                 }
2347         }
2348
2349         /// Removes any uncommitted HTLCs, to be used on peer disconnection, including any pending
2350         /// HTLCs that we intended to add but haven't as we were waiting on a remote revoke.
2351         /// Returns the set of PendingHTLCStatuses from remote uncommitted HTLCs (which we're
2352         /// implicitly dropping) and the payment_hashes of HTLCs we tried to add but are dropping.
2353         /// No further message handling calls may be made until a channel_reestablish dance has
2354         /// completed.
2355         pub fn remove_uncommitted_htlcs_and_mark_paused(&mut self) -> Vec<(HTLCSource, PaymentHash)> {
2356                 let mut outbound_drops = Vec::new();
2357
2358                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
2359                 if self.channel_state < ChannelState::FundingSent as u32 {
2360                         self.channel_state = ChannelState::ShutdownComplete as u32;
2361                         return outbound_drops;
2362                 }
2363                 // Upon reconnect we have to start the closing_signed dance over, but shutdown messages
2364                 // will be retransmitted.
2365                 self.last_sent_closing_fee = None;
2366
2367                 let mut inbound_drop_count = 0;
2368                 self.pending_inbound_htlcs.retain(|htlc| {
2369                         match htlc.state {
2370                                 InboundHTLCState::RemoteAnnounced(_) => {
2371                                         // They sent us an update_add_htlc but we never got the commitment_signed.
2372                                         // We'll tell them what commitment_signed we're expecting next and they'll drop
2373                                         // this HTLC accordingly
2374                                         inbound_drop_count += 1;
2375                                         false
2376                                 },
2377                                 InboundHTLCState::AwaitingRemoteRevokeToAnnounce(_)|InboundHTLCState::AwaitingAnnouncedRemoteRevoke(_) => {
2378                                         // We received a commitment_signed updating this HTLC and (at least hopefully)
2379                                         // sent a revoke_and_ack (which we can re-transmit) and have heard nothing
2380                                         // in response to it yet, so don't touch it.
2381                                         true
2382                                 },
2383                                 InboundHTLCState::Committed => true,
2384                                 InboundHTLCState::LocalRemoved(_) => {
2385                                         // We (hopefully) sent a commitment_signed updating this HTLC (which we can
2386                                         // re-transmit if needed) and they may have even sent a revoke_and_ack back
2387                                         // (that we missed). Keep this around for now and if they tell us they missed
2388                                         // the commitment_signed we can re-transmit the update then.
2389                                         true
2390                                 },
2391                         }
2392                 });
2393                 self.next_remote_htlc_id -= inbound_drop_count;
2394
2395                 for htlc in self.pending_outbound_htlcs.iter_mut() {
2396                         if let OutboundHTLCState::RemoteRemoved(_) = htlc.state {
2397                                 // They sent us an update to remove this but haven't yet sent the corresponding
2398                                 // commitment_signed, we need to move it back to Committed and they can re-send
2399                                 // the update upon reconnection.
2400                                 htlc.state = OutboundHTLCState::Committed;
2401                         }
2402                 }
2403
2404                 self.holding_cell_htlc_updates.retain(|htlc_update| {
2405                         match htlc_update {
2406                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
2407                                         outbound_drops.push((source.clone(), payment_hash.clone()));
2408                                         false
2409                                 },
2410                                 &HTLCUpdateAwaitingACK::ClaimHTLC {..} | &HTLCUpdateAwaitingACK::FailHTLC {..} => true,
2411                         }
2412                 });
2413                 self.channel_state |= ChannelState::PeerDisconnected as u32;
2414                 log_debug!(self, "Peer disconnection resulted in {} remote-announced HTLC drops and {} waiting-to-locally-announced HTLC drops on channel {}", outbound_drops.len(), inbound_drop_count, log_bytes!(self.channel_id()));
2415                 outbound_drops
2416         }
2417
2418         /// Indicates that a ChannelMonitor update failed to be stored by the client and further
2419         /// updates are partially paused.
2420         /// This must be called immediately after the call which generated the ChannelMonitor update
2421         /// which failed. The messages which were generated from that call which generated the
2422         /// monitor update failure must *not* have been sent to the remote end, and must instead
2423         /// have been dropped. They will be regenerated when monitor_updating_restored is called.
2424         pub fn monitor_update_failed(&mut self, resend_raa: bool, resend_commitment: bool, mut pending_forwards: Vec<(PendingHTLCInfo, u64)>, mut pending_fails: Vec<(HTLCSource, PaymentHash, HTLCFailReason)>) {
2425                 assert_eq!(self.channel_state & ChannelState::MonitorUpdateFailed as u32, 0);
2426                 self.monitor_pending_revoke_and_ack = resend_raa;
2427                 self.monitor_pending_commitment_signed = resend_commitment;
2428                 assert!(self.monitor_pending_forwards.is_empty());
2429                 mem::swap(&mut pending_forwards, &mut self.monitor_pending_forwards);
2430                 assert!(self.monitor_pending_failures.is_empty());
2431                 mem::swap(&mut pending_fails, &mut self.monitor_pending_failures);
2432                 self.channel_state |= ChannelState::MonitorUpdateFailed as u32;
2433         }
2434
2435         /// Indicates that the latest ChannelMonitor update has been committed by the client
2436         /// successfully and we should restore normal operation. Returns messages which should be sent
2437         /// to the remote side.
2438         pub fn monitor_updating_restored(&mut self) -> (Option<msgs::RevokeAndACK>, Option<msgs::CommitmentUpdate>, RAACommitmentOrder, Vec<(PendingHTLCInfo, u64)>, Vec<(HTLCSource, PaymentHash, HTLCFailReason)>, bool, Option<msgs::FundingLocked>) {
2439                 assert_eq!(self.channel_state & ChannelState::MonitorUpdateFailed as u32, ChannelState::MonitorUpdateFailed as u32);
2440                 self.channel_state &= !(ChannelState::MonitorUpdateFailed as u32);
2441
2442                 let needs_broadcast_safe = self.channel_state & (ChannelState::FundingSent as u32) != 0 && self.channel_outbound;
2443
2444                 // Because we will never generate a FundingBroadcastSafe event when we're in
2445                 // MonitorUpdateFailed, if we assume the user only broadcast the funding transaction when
2446                 // they received the FundingBroadcastSafe event, we can only ever hit
2447                 // monitor_pending_funding_locked when we're an inbound channel which failed to persist the
2448                 // monitor on funding_created, and we even got the funding transaction confirmed before the
2449                 // monitor was persisted.
2450                 let funding_locked = if self.monitor_pending_funding_locked {
2451                         assert!(!self.channel_outbound, "Funding transaction broadcast without FundingBroadcastSafe!");
2452                         self.monitor_pending_funding_locked = false;
2453                         let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2454                         let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret);
2455                         Some(msgs::FundingLocked {
2456                                 channel_id: self.channel_id(),
2457                                 next_per_commitment_point: next_per_commitment_point,
2458                         })
2459                 } else { None };
2460
2461                 let mut forwards = Vec::new();
2462                 mem::swap(&mut forwards, &mut self.monitor_pending_forwards);
2463                 let mut failures = Vec::new();
2464                 mem::swap(&mut failures, &mut self.monitor_pending_failures);
2465
2466                 if self.channel_state & (ChannelState::PeerDisconnected as u32) != 0 {
2467                         self.monitor_pending_revoke_and_ack = false;
2468                         self.monitor_pending_commitment_signed = false;
2469                         return (None, None, RAACommitmentOrder::RevokeAndACKFirst, forwards, failures, needs_broadcast_safe, funding_locked);
2470                 }
2471
2472                 let raa = if self.monitor_pending_revoke_and_ack {
2473                         Some(self.get_last_revoke_and_ack())
2474                 } else { None };
2475                 let commitment_update = if self.monitor_pending_commitment_signed {
2476                         Some(self.get_last_commitment_update())
2477                 } else { None };
2478
2479                 self.monitor_pending_revoke_and_ack = false;
2480                 self.monitor_pending_commitment_signed = false;
2481                 let order = self.resend_order.clone();
2482                 log_trace!(self, "Restored monitor updating resulting in {}{} commitment update and {} RAA, with {} first",
2483                         if needs_broadcast_safe { "a funding broadcast safe, " } else { "" },
2484                         if commitment_update.is_some() { "a" } else { "no" },
2485                         if raa.is_some() { "an" } else { "no" },
2486                         match order { RAACommitmentOrder::CommitmentFirst => "commitment", RAACommitmentOrder::RevokeAndACKFirst => "RAA"});
2487                 (raa, commitment_update, order, forwards, failures, needs_broadcast_safe, funding_locked)
2488         }
2489
2490         pub fn update_fee<F: Deref>(&mut self, fee_estimator: &F, msg: &msgs::UpdateFee) -> Result<(), ChannelError>
2491                 where F::Target: FeeEstimator
2492         {
2493                 if self.channel_outbound {
2494                         return Err(ChannelError::Close("Non-funding remote tried to update channel fee"));
2495                 }
2496                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2497                         return Err(ChannelError::Close("Peer sent update_fee when we needed a channel_reestablish"));
2498                 }
2499                 Channel::<ChanSigner>::check_remote_fee(fee_estimator, msg.feerate_per_kw)?;
2500                 self.pending_update_fee = Some(msg.feerate_per_kw as u64);
2501                 self.update_time_counter += 1;
2502                 Ok(())
2503         }
2504
2505         fn get_last_revoke_and_ack(&self) -> msgs::RevokeAndACK {
2506                 let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number));
2507                 let per_commitment_secret = chan_utils::build_commitment_secret(self.local_keys.commitment_seed(), self.cur_local_commitment_transaction_number + 2);
2508                 msgs::RevokeAndACK {
2509                         channel_id: self.channel_id,
2510                         per_commitment_secret,
2511                         next_per_commitment_point,
2512                 }
2513         }
2514
2515         fn get_last_commitment_update(&self) -> msgs::CommitmentUpdate {
2516                 let mut update_add_htlcs = Vec::new();
2517                 let mut update_fulfill_htlcs = Vec::new();
2518                 let mut update_fail_htlcs = Vec::new();
2519                 let mut update_fail_malformed_htlcs = Vec::new();
2520
2521                 for htlc in self.pending_outbound_htlcs.iter() {
2522                         if let &OutboundHTLCState::LocalAnnounced(ref onion_packet) = &htlc.state {
2523                                 update_add_htlcs.push(msgs::UpdateAddHTLC {
2524                                         channel_id: self.channel_id(),
2525                                         htlc_id: htlc.htlc_id,
2526                                         amount_msat: htlc.amount_msat,
2527                                         payment_hash: htlc.payment_hash,
2528                                         cltv_expiry: htlc.cltv_expiry,
2529                                         onion_routing_packet: (**onion_packet).clone(),
2530                                 });
2531                         }
2532                 }
2533
2534                 for htlc in self.pending_inbound_htlcs.iter() {
2535                         if let &InboundHTLCState::LocalRemoved(ref reason) = &htlc.state {
2536                                 match reason {
2537                                         &InboundHTLCRemovalReason::FailRelay(ref err_packet) => {
2538                                                 update_fail_htlcs.push(msgs::UpdateFailHTLC {
2539                                                         channel_id: self.channel_id(),
2540                                                         htlc_id: htlc.htlc_id,
2541                                                         reason: err_packet.clone()
2542                                                 });
2543                                         },
2544                                         &InboundHTLCRemovalReason::FailMalformed((ref sha256_of_onion, ref failure_code)) => {
2545                                                 update_fail_malformed_htlcs.push(msgs::UpdateFailMalformedHTLC {
2546                                                         channel_id: self.channel_id(),
2547                                                         htlc_id: htlc.htlc_id,
2548                                                         sha256_of_onion: sha256_of_onion.clone(),
2549                                                         failure_code: failure_code.clone(),
2550                                                 });
2551                                         },
2552                                         &InboundHTLCRemovalReason::Fulfill(ref payment_preimage) => {
2553                                                 update_fulfill_htlcs.push(msgs::UpdateFulfillHTLC {
2554                                                         channel_id: self.channel_id(),
2555                                                         htlc_id: htlc.htlc_id,
2556                                                         payment_preimage: payment_preimage.clone(),
2557                                                 });
2558                                         },
2559                                 }
2560                         }
2561                 }
2562
2563                 log_trace!(self, "Regenerated latest commitment update with {} update_adds, {} update_fulfills, {} update_fails, and {} update_fail_malformeds",
2564                                 update_add_htlcs.len(), update_fulfill_htlcs.len(), update_fail_htlcs.len(), update_fail_malformed_htlcs.len());
2565                 msgs::CommitmentUpdate {
2566                         update_add_htlcs, update_fulfill_htlcs, update_fail_htlcs, update_fail_malformed_htlcs,
2567                         update_fee: None,
2568                         commitment_signed: self.send_commitment_no_state_update().expect("It looks like we failed to re-generate a commitment_signed we had previously sent?").0,
2569                 }
2570         }
2571
2572         /// May panic if some calls other than message-handling calls (which will all Err immediately)
2573         /// have been called between remove_uncommitted_htlcs_and_mark_paused and this call.
2574         pub fn channel_reestablish(&mut self, msg: &msgs::ChannelReestablish) -> Result<(Option<msgs::FundingLocked>, Option<msgs::RevokeAndACK>, Option<msgs::CommitmentUpdate>, Option<ChannelMonitorUpdate>, RAACommitmentOrder, Option<msgs::Shutdown>), ChannelError> {
2575                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == 0 {
2576                         // While BOLT 2 doesn't indicate explicitly we should error this channel here, it
2577                         // almost certainly indicates we are going to end up out-of-sync in some way, so we
2578                         // just close here instead of trying to recover.
2579                         return Err(ChannelError::Close("Peer sent a loose channel_reestablish not after reconnect"));
2580                 }
2581
2582                 if msg.next_local_commitment_number >= INITIAL_COMMITMENT_NUMBER || msg.next_remote_commitment_number >= INITIAL_COMMITMENT_NUMBER ||
2583                         msg.next_local_commitment_number == 0 {
2584                         return Err(ChannelError::Close("Peer sent a garbage channel_reestablish"));
2585                 }
2586
2587                 if msg.next_remote_commitment_number > 0 {
2588                         match msg.data_loss_protect {
2589                                 OptionalField::Present(ref data_loss) => {
2590                                         if chan_utils::build_commitment_secret(self.local_keys.commitment_seed(), INITIAL_COMMITMENT_NUMBER - msg.next_remote_commitment_number + 1) != data_loss.your_last_per_commitment_secret {
2591                                                 return Err(ChannelError::Close("Peer sent a garbage channel_reestablish with secret key not matching the commitment height provided"));
2592                                         }
2593                                         if msg.next_remote_commitment_number > INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number {
2594                                                 self.latest_monitor_update_id += 1;
2595                                                 let monitor_update = ChannelMonitorUpdate {
2596                                                         update_id: self.latest_monitor_update_id,
2597                                                         updates: vec![ChannelMonitorUpdateStep::RescueRemoteCommitmentTXInfo {
2598                                                                 their_current_per_commitment_point: data_loss.my_current_per_commitment_point
2599                                                         }]
2600                                                 };
2601                                                 self.channel_monitor.as_mut().unwrap().update_monitor_ooo(monitor_update.clone()).unwrap();
2602                                                 return Err(ChannelError::CloseDelayBroadcast {
2603                                                         msg: "We have fallen behind - we have received proof that if we broadcast remote is going to claim our funds - we can't do any automated broadcasting",
2604                                                         update: monitor_update
2605                                                 });
2606                                         }
2607                                 },
2608                                 OptionalField::Absent => {}
2609                         }
2610                 }
2611
2612                 // Go ahead and unmark PeerDisconnected as various calls we may make check for it (and all
2613                 // remaining cases either succeed or ErrorMessage-fail).
2614                 self.channel_state &= !(ChannelState::PeerDisconnected as u32);
2615
2616                 let shutdown_msg = if self.channel_state & (ChannelState::LocalShutdownSent as u32) != 0 {
2617                         Some(msgs::Shutdown {
2618                                 channel_id: self.channel_id,
2619                                 scriptpubkey: self.get_closing_scriptpubkey(),
2620                         })
2621                 } else { None };
2622
2623                 if self.channel_state & (ChannelState::FundingSent as u32) == ChannelState::FundingSent as u32 {
2624                         // If we're waiting on a monitor update, we shouldn't re-send any funding_locked's.
2625                         if self.channel_state & (ChannelState::OurFundingLocked as u32) == 0 ||
2626                                         self.channel_state & (ChannelState::MonitorUpdateFailed as u32) != 0 {
2627                                 if msg.next_remote_commitment_number != 0 {
2628                                         return Err(ChannelError::Close("Peer claimed they saw a revoke_and_ack but we haven't sent funding_locked yet"));
2629                                 }
2630                                 // Short circuit the whole handler as there is nothing we can resend them
2631                                 return Ok((None, None, None, None, RAACommitmentOrder::CommitmentFirst, shutdown_msg));
2632                         }
2633
2634                         // We have OurFundingLocked set!
2635                         let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2636                         let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret);
2637                         return Ok((Some(msgs::FundingLocked {
2638                                 channel_id: self.channel_id(),
2639                                 next_per_commitment_point: next_per_commitment_point,
2640                         }), None, None, None, RAACommitmentOrder::CommitmentFirst, shutdown_msg));
2641                 }
2642
2643                 let required_revoke = if msg.next_remote_commitment_number + 1 == INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number {
2644                         // Remote isn't waiting on any RevokeAndACK from us!
2645                         // Note that if we need to repeat our FundingLocked we'll do that in the next if block.
2646                         None
2647                 } else if msg.next_remote_commitment_number + 1 == (INITIAL_COMMITMENT_NUMBER - 1) - self.cur_local_commitment_transaction_number {
2648                         if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) != 0 {
2649                                 self.monitor_pending_revoke_and_ack = true;
2650                                 None
2651                         } else {
2652                                 Some(self.get_last_revoke_and_ack())
2653                         }
2654                 } else {
2655                         return Err(ChannelError::Close("Peer attempted to reestablish channel with a very old local commitment transaction"));
2656                 };
2657
2658                 // We increment cur_remote_commitment_transaction_number only upon receipt of
2659                 // revoke_and_ack, not on sending commitment_signed, so we add one if have
2660                 // AwaitingRemoteRevoke set, which indicates we sent a commitment_signed but haven't gotten
2661                 // the corresponding revoke_and_ack back yet.
2662                 let our_next_remote_commitment_number = INITIAL_COMMITMENT_NUMBER - self.cur_remote_commitment_transaction_number + if (self.channel_state & ChannelState::AwaitingRemoteRevoke as u32) != 0 { 1 } else { 0 };
2663
2664                 let resend_funding_locked = if msg.next_local_commitment_number == 1 && INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number == 1 {
2665                         // We should never have to worry about MonitorUpdateFailed resending FundingLocked
2666                         let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
2667                         let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret);
2668                         Some(msgs::FundingLocked {
2669                                 channel_id: self.channel_id(),
2670                                 next_per_commitment_point: next_per_commitment_point,
2671                         })
2672                 } else { None };
2673
2674                 if msg.next_local_commitment_number == our_next_remote_commitment_number {
2675                         if required_revoke.is_some() {
2676                                 log_debug!(self, "Reconnected channel {} with only lost outbound RAA", log_bytes!(self.channel_id()));
2677                         } else {
2678                                 log_debug!(self, "Reconnected channel {} with no loss", log_bytes!(self.channel_id()));
2679                         }
2680
2681                         if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32 | ChannelState::MonitorUpdateFailed as u32)) == 0 {
2682                                 // We're up-to-date and not waiting on a remote revoke (if we are our
2683                                 // channel_reestablish should result in them sending a revoke_and_ack), but we may
2684                                 // have received some updates while we were disconnected. Free the holding cell
2685                                 // now!
2686                                 match self.free_holding_cell_htlcs() {
2687                                         Err(ChannelError::Close(msg)) => return Err(ChannelError::Close(msg)),
2688                                         Err(ChannelError::Ignore(_)) | Err(ChannelError::CloseDelayBroadcast { .. }) => panic!("Got non-channel-failing result from free_holding_cell_htlcs"),
2689                                         Ok(Some((commitment_update, monitor_update))) => return Ok((resend_funding_locked, required_revoke, Some(commitment_update), Some(monitor_update), self.resend_order.clone(), shutdown_msg)),
2690                                         Ok(None) => return Ok((resend_funding_locked, required_revoke, None, None, self.resend_order.clone(), shutdown_msg)),
2691                                 }
2692                         } else {
2693                                 return Ok((resend_funding_locked, required_revoke, None, None, self.resend_order.clone(), shutdown_msg));
2694                         }
2695                 } else if msg.next_local_commitment_number == our_next_remote_commitment_number - 1 {
2696                         if required_revoke.is_some() {
2697                                 log_debug!(self, "Reconnected channel {} with lost outbound RAA and lost remote commitment tx", log_bytes!(self.channel_id()));
2698                         } else {
2699                                 log_debug!(self, "Reconnected channel {} with only lost remote commitment tx", log_bytes!(self.channel_id()));
2700                         }
2701
2702                         if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) != 0 {
2703                                 self.monitor_pending_commitment_signed = true;
2704                                 return Ok((resend_funding_locked, None, None, None, self.resend_order.clone(), shutdown_msg));
2705                         }
2706
2707                         return Ok((resend_funding_locked, required_revoke, Some(self.get_last_commitment_update()), None, self.resend_order.clone(), shutdown_msg));
2708                 } else {
2709                         return Err(ChannelError::Close("Peer attempted to reestablish channel with a very old remote commitment transaction"));
2710                 }
2711         }
2712
2713         fn maybe_propose_first_closing_signed<F: Deref>(&mut self, fee_estimator: &F) -> Option<msgs::ClosingSigned>
2714                 where F::Target: FeeEstimator
2715         {
2716                 if !self.channel_outbound || !self.pending_inbound_htlcs.is_empty() || !self.pending_outbound_htlcs.is_empty() ||
2717                                 self.channel_state & (BOTH_SIDES_SHUTDOWN_MASK | ChannelState::AwaitingRemoteRevoke as u32) != BOTH_SIDES_SHUTDOWN_MASK ||
2718                                 self.last_sent_closing_fee.is_some() || self.pending_update_fee.is_some() {
2719                         return None;
2720                 }
2721
2722                 let mut proposed_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
2723                 if self.feerate_per_kw > proposed_feerate {
2724                         proposed_feerate = self.feerate_per_kw;
2725                 }
2726                 let tx_weight = Self::get_closing_transaction_weight(&self.get_closing_scriptpubkey(), self.their_shutdown_scriptpubkey.as_ref().unwrap());
2727                 let proposed_total_fee_satoshis = proposed_feerate * tx_weight / 1000;
2728
2729                 let (closing_tx, total_fee_satoshis) = self.build_closing_transaction(proposed_total_fee_satoshis, false);
2730                 let our_sig = self.local_keys
2731                         .sign_closing_transaction(&closing_tx, &self.secp_ctx)
2732                         .ok();
2733                 if our_sig.is_none() { return None; }
2734
2735                 self.last_sent_closing_fee = Some((proposed_feerate, total_fee_satoshis, our_sig.clone().unwrap()));
2736                 Some(msgs::ClosingSigned {
2737                         channel_id: self.channel_id,
2738                         fee_satoshis: total_fee_satoshis,
2739                         signature: our_sig.unwrap(),
2740                 })
2741         }
2742
2743         pub fn shutdown<F: Deref>(&mut self, fee_estimator: &F, msg: &msgs::Shutdown) -> Result<(Option<msgs::Shutdown>, Option<msgs::ClosingSigned>, Vec<(HTLCSource, PaymentHash)>), ChannelError>
2744                 where F::Target: FeeEstimator
2745         {
2746                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2747                         return Err(ChannelError::Close("Peer sent shutdown when we needed a channel_reestablish"));
2748                 }
2749                 if self.channel_state < ChannelState::FundingSent as u32 {
2750                         // Spec says we should fail the connection, not the channel, but that's nonsense, there
2751                         // are plenty of reasons you may want to fail a channel pre-funding, and spec says you
2752                         // can do that via error message without getting a connection fail anyway...
2753                         return Err(ChannelError::Close("Peer sent shutdown pre-funding generation"));
2754                 }
2755                 for htlc in self.pending_inbound_htlcs.iter() {
2756                         if let InboundHTLCState::RemoteAnnounced(_) = htlc.state {
2757                                 return Err(ChannelError::Close("Got shutdown with remote pending HTLCs"));
2758                         }
2759                 }
2760                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
2761
2762                 // BOLT 2 says we must only send a scriptpubkey of certain standard forms, which are up to
2763                 // 34 bytes in length, so don't let the remote peer feed us some super fee-heavy script.
2764                 if self.channel_outbound && msg.scriptpubkey.len() > 34 {
2765                         return Err(ChannelError::Close("Got shutdown_scriptpubkey of absurd length from remote peer"));
2766                 }
2767
2768                 //Check shutdown_scriptpubkey form as BOLT says we must
2769                 if !msg.scriptpubkey.is_p2pkh() && !msg.scriptpubkey.is_p2sh() && !msg.scriptpubkey.is_v0_p2wpkh() && !msg.scriptpubkey.is_v0_p2wsh() {
2770                         return Err(ChannelError::Close("Got a nonstandard scriptpubkey from remote peer"));
2771                 }
2772
2773                 if self.their_shutdown_scriptpubkey.is_some() {
2774                         if Some(&msg.scriptpubkey) != self.their_shutdown_scriptpubkey.as_ref() {
2775                                 return Err(ChannelError::Close("Got shutdown request with a scriptpubkey which did not match their previous scriptpubkey"));
2776                         }
2777                 } else {
2778                         self.their_shutdown_scriptpubkey = Some(msg.scriptpubkey.clone());
2779                 }
2780
2781                 // From here on out, we may not fail!
2782
2783                 self.channel_state |= ChannelState::RemoteShutdownSent as u32;
2784                 self.update_time_counter += 1;
2785
2786                 // We can't send our shutdown until we've committed all of our pending HTLCs, but the
2787                 // remote side is unlikely to accept any new HTLCs, so we go ahead and "free" any holding
2788                 // cell HTLCs and return them to fail the payment.
2789                 self.holding_cell_update_fee = None;
2790                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
2791                 self.holding_cell_htlc_updates.retain(|htlc_update| {
2792                         match htlc_update {
2793                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
2794                                         dropped_outbound_htlcs.push((source.clone(), payment_hash.clone()));
2795                                         false
2796                                 },
2797                                 _ => true
2798                         }
2799                 });
2800                 // If we have any LocalAnnounced updates we'll probably just get back a update_fail_htlc
2801                 // immediately after the commitment dance, but we can send a Shutdown cause we won't send
2802                 // any further commitment updates after we set LocalShutdownSent.
2803
2804                 let our_shutdown = if (self.channel_state & ChannelState::LocalShutdownSent as u32) == ChannelState::LocalShutdownSent as u32 {
2805                         None
2806                 } else {
2807                         Some(msgs::Shutdown {
2808                                 channel_id: self.channel_id,
2809                                 scriptpubkey: self.get_closing_scriptpubkey(),
2810                         })
2811                 };
2812
2813                 self.channel_state |= ChannelState::LocalShutdownSent as u32;
2814                 self.update_time_counter += 1;
2815
2816                 Ok((our_shutdown, self.maybe_propose_first_closing_signed(fee_estimator), dropped_outbound_htlcs))
2817         }
2818
2819         fn build_signed_closing_transaction(&self, tx: &mut Transaction, their_sig: &Signature, our_sig: &Signature) {
2820                 if tx.input.len() != 1 { panic!("Tried to sign closing transaction that had input count != 1!"); }
2821                 if tx.input[0].witness.len() != 0 { panic!("Tried to re-sign closing transaction"); }
2822                 if tx.output.len() > 2 { panic!("Tried to sign bogus closing transaction"); }
2823
2824                 tx.input[0].witness.push(Vec::new()); // First is the multisig dummy
2825
2826                 let our_funding_key = PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.funding_key()).serialize();
2827                 let their_funding_key = self.their_funding_pubkey().serialize();
2828                 if our_funding_key[..] < their_funding_key[..] {
2829                         tx.input[0].witness.push(our_sig.serialize_der().to_vec());
2830                         tx.input[0].witness.push(their_sig.serialize_der().to_vec());
2831                 } else {
2832                         tx.input[0].witness.push(their_sig.serialize_der().to_vec());
2833                         tx.input[0].witness.push(our_sig.serialize_der().to_vec());
2834                 }
2835                 tx.input[0].witness[1].push(SigHashType::All as u8);
2836                 tx.input[0].witness[2].push(SigHashType::All as u8);
2837
2838                 tx.input[0].witness.push(self.get_funding_redeemscript().into_bytes());
2839         }
2840
2841         pub fn closing_signed<F: Deref>(&mut self, fee_estimator: &F, msg: &msgs::ClosingSigned) -> Result<(Option<msgs::ClosingSigned>, Option<Transaction>), ChannelError>
2842                 where F::Target: FeeEstimator
2843         {
2844                 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != BOTH_SIDES_SHUTDOWN_MASK {
2845                         return Err(ChannelError::Close("Remote end sent us a closing_signed before both sides provided a shutdown"));
2846                 }
2847                 if self.channel_state & (ChannelState::PeerDisconnected as u32) == ChannelState::PeerDisconnected as u32 {
2848                         return Err(ChannelError::Close("Peer sent closing_signed when we needed a channel_reestablish"));
2849                 }
2850                 if !self.pending_inbound_htlcs.is_empty() || !self.pending_outbound_htlcs.is_empty() {
2851                         return Err(ChannelError::Close("Remote end sent us a closing_signed while there were still pending HTLCs"));
2852                 }
2853                 if msg.fee_satoshis > 21000000 * 10000000 { //this is required to stop potential overflow in build_closing_transaction
2854                         return Err(ChannelError::Close("Remote tried to send us a closing tx with > 21 million BTC fee"));
2855                 }
2856
2857                 let funding_redeemscript = self.get_funding_redeemscript();
2858                 let (mut closing_tx, used_total_fee) = self.build_closing_transaction(msg.fee_satoshis, false);
2859                 if used_total_fee != msg.fee_satoshis {
2860                         return Err(ChannelError::Close("Remote sent us a closing_signed with a fee greater than the value they can claim"));
2861                 }
2862                 let mut sighash = hash_to_message!(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]);
2863
2864                 let their_funding_pubkey = &self.their_pubkeys.as_ref().unwrap().funding_pubkey;
2865
2866                 match self.secp_ctx.verify(&sighash, &msg.signature, their_funding_pubkey) {
2867                         Ok(_) => {},
2868                         Err(_e) => {
2869                                 // The remote end may have decided to revoke their output due to inconsistent dust
2870                                 // limits, so check for that case by re-checking the signature here.
2871                                 closing_tx = self.build_closing_transaction(msg.fee_satoshis, true).0;
2872                                 sighash = hash_to_message!(&bip143::SighashComponents::new(&closing_tx).sighash_all(&closing_tx.input[0], &funding_redeemscript, self.channel_value_satoshis)[..]);
2873                                 secp_check!(self.secp_ctx.verify(&sighash, &msg.signature, self.their_funding_pubkey()), "Invalid closing tx signature from peer");
2874                         },
2875                 };
2876
2877                 if let Some((_, last_fee, our_sig)) = self.last_sent_closing_fee {
2878                         if last_fee == msg.fee_satoshis {
2879                                 self.build_signed_closing_transaction(&mut closing_tx, &msg.signature, &our_sig);
2880                                 self.channel_state = ChannelState::ShutdownComplete as u32;
2881                                 self.update_time_counter += 1;
2882                                 return Ok((None, Some(closing_tx)));
2883                         }
2884                 }
2885
2886                 macro_rules! propose_new_feerate {
2887                         ($new_feerate: expr) => {
2888                                 let closing_tx_max_weight = Self::get_closing_transaction_weight(&self.get_closing_scriptpubkey(), self.their_shutdown_scriptpubkey.as_ref().unwrap());
2889                                 let (closing_tx, used_total_fee) = self.build_closing_transaction($new_feerate * closing_tx_max_weight / 1000, false);
2890                                 let our_sig = self.local_keys
2891                                         .sign_closing_transaction(&closing_tx, &self.secp_ctx)
2892                                         .map_err(|_| ChannelError::Close("External signer refused to sign closing transaction"))?;
2893                                 self.last_sent_closing_fee = Some(($new_feerate, used_total_fee, our_sig.clone()));
2894                                 return Ok((Some(msgs::ClosingSigned {
2895                                         channel_id: self.channel_id,
2896                                         fee_satoshis: used_total_fee,
2897                                         signature: our_sig,
2898                                 }), None))
2899                         }
2900                 }
2901
2902                 let proposed_sat_per_kw = msg.fee_satoshis * 1000 / closing_tx.get_weight() as u64;
2903                 if self.channel_outbound {
2904                         let our_max_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
2905                         if proposed_sat_per_kw > our_max_feerate {
2906                                 if let Some((last_feerate, _, _)) = self.last_sent_closing_fee {
2907                                         if our_max_feerate <= last_feerate {
2908                                                 return Err(ChannelError::Close("Unable to come to consensus about closing feerate, remote wanted something higher than our Normal feerate"));
2909                                         }
2910                                 }
2911                                 propose_new_feerate!(our_max_feerate);
2912                         }
2913                 } else {
2914                         let our_min_feerate = fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background);
2915                         if proposed_sat_per_kw < our_min_feerate {
2916                                 if let Some((last_feerate, _, _)) = self.last_sent_closing_fee {
2917                                         if our_min_feerate >= last_feerate {
2918                                                 return Err(ChannelError::Close("Unable to come to consensus about closing feerate, remote wanted something lower than our Background feerate"));
2919                                         }
2920                                 }
2921                                 propose_new_feerate!(our_min_feerate);
2922                         }
2923                 }
2924
2925                 let our_sig = self.local_keys
2926                         .sign_closing_transaction(&closing_tx, &self.secp_ctx)
2927                         .map_err(|_| ChannelError::Close("External signer refused to sign closing transaction"))?;
2928                 self.build_signed_closing_transaction(&mut closing_tx, &msg.signature, &our_sig);
2929
2930                 self.channel_state = ChannelState::ShutdownComplete as u32;
2931                 self.update_time_counter += 1;
2932
2933                 Ok((Some(msgs::ClosingSigned {
2934                         channel_id: self.channel_id,
2935                         fee_satoshis: msg.fee_satoshis,
2936                         signature: our_sig,
2937                 }), Some(closing_tx)))
2938         }
2939
2940         // Public utilities:
2941
2942         pub fn channel_id(&self) -> [u8; 32] {
2943                 self.channel_id
2944         }
2945
2946         /// Gets the "user_id" value passed into the construction of this channel. It has no special
2947         /// meaning and exists only to allow users to have a persistent identifier of a channel.
2948         pub fn get_user_id(&self) -> u64 {
2949                 self.user_id
2950         }
2951
2952         /// May only be called after funding has been initiated (ie is_funding_initiated() is true)
2953         pub fn channel_monitor(&mut self) -> &mut ChannelMonitor<ChanSigner> {
2954                 if self.channel_state < ChannelState::FundingCreated as u32 {
2955                         panic!("Can't get a channel monitor until funding has been created");
2956                 }
2957                 self.channel_monitor.as_mut().unwrap()
2958         }
2959
2960         /// Guaranteed to be Some after both FundingLocked messages have been exchanged (and, thus,
2961         /// is_usable() returns true).
2962         /// Allowed in any state (including after shutdown)
2963         pub fn get_short_channel_id(&self) -> Option<u64> {
2964                 self.short_channel_id
2965         }
2966
2967         /// Returns the funding_txo we either got from our peer, or were given by
2968         /// get_outbound_funding_created.
2969         pub fn get_funding_txo(&self) -> Option<OutPoint> {
2970                 self.funding_txo
2971         }
2972
2973         /// Allowed in any state (including after shutdown)
2974         pub fn get_their_node_id(&self) -> PublicKey {
2975                 self.their_node_id
2976         }
2977
2978         /// Allowed in any state (including after shutdown)
2979         pub fn get_our_htlc_minimum_msat(&self) -> u64 {
2980                 self.our_htlc_minimum_msat
2981         }
2982
2983         /// Allowed in any state (including after shutdown)
2984         pub fn get_their_htlc_minimum_msat(&self) -> u64 {
2985                 self.our_htlc_minimum_msat
2986         }
2987
2988         pub fn get_value_satoshis(&self) -> u64 {
2989                 self.channel_value_satoshis
2990         }
2991
2992         pub fn get_fee_proportional_millionths(&self) -> u32 {
2993                 self.config.fee_proportional_millionths
2994         }
2995
2996         #[cfg(test)]
2997         pub fn get_feerate(&self) -> u64 {
2998                 self.feerate_per_kw
2999         }
3000
3001         pub fn get_cur_local_commitment_transaction_number(&self) -> u64 {
3002                 self.cur_local_commitment_transaction_number + 1
3003         }
3004
3005         pub fn get_cur_remote_commitment_transaction_number(&self) -> u64 {
3006                 self.cur_remote_commitment_transaction_number + 1 - if self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32) != 0 { 1 } else { 0 }
3007         }
3008
3009         pub fn get_revoked_remote_commitment_transaction_number(&self) -> u64 {
3010                 self.cur_remote_commitment_transaction_number + 2
3011         }
3012
3013         #[cfg(test)]
3014         pub fn get_local_keys(&self) -> &ChanSigner {
3015                 &self.local_keys
3016         }
3017
3018         #[cfg(test)]
3019         pub fn get_value_stat(&self) -> ChannelValueStat {
3020                 ChannelValueStat {
3021                         value_to_self_msat: self.value_to_self_msat,
3022                         channel_value_msat: self.channel_value_satoshis * 1000,
3023                         channel_reserve_msat: self.their_channel_reserve_satoshis * 1000,
3024                         pending_outbound_htlcs_amount_msat: self.pending_outbound_htlcs.iter().map(|ref h| h.amount_msat).sum::<u64>(),
3025                         pending_inbound_htlcs_amount_msat: self.pending_inbound_htlcs.iter().map(|ref h| h.amount_msat).sum::<u64>(),
3026                         holding_cell_outbound_amount_msat: {
3027                                 let mut res = 0;
3028                                 for h in self.holding_cell_htlc_updates.iter() {
3029                                         match h {
3030                                                 &HTLCUpdateAwaitingACK::AddHTLC{amount_msat, .. } => {
3031                                                         res += amount_msat;
3032                                                 }
3033                                                 _ => {}
3034                                         }
3035                                 }
3036                                 res
3037                         },
3038                         their_max_htlc_value_in_flight_msat: self.their_max_htlc_value_in_flight_msat,
3039                 }
3040         }
3041
3042         /// Allowed in any state (including after shutdown)
3043         pub fn get_update_time_counter(&self) -> u32 {
3044                 self.update_time_counter
3045         }
3046
3047         pub fn get_latest_monitor_update_id(&self) -> u64 {
3048                 self.latest_monitor_update_id
3049         }
3050
3051         pub fn should_announce(&self) -> bool {
3052                 self.config.announced_channel
3053         }
3054
3055         pub fn is_outbound(&self) -> bool {
3056                 self.channel_outbound
3057         }
3058
3059         /// Gets the fee we'd want to charge for adding an HTLC output to this Channel
3060         /// Allowed in any state (including after shutdown)
3061         pub fn get_our_fee_base_msat<F: Deref>(&self, fee_estimator: &F) -> u32
3062                 where F::Target: FeeEstimator
3063         {
3064                 // For lack of a better metric, we calculate what it would cost to consolidate the new HTLC
3065                 // output value back into a transaction with the regular channel output:
3066
3067                 // the fee cost of the HTLC-Success/HTLC-Timeout transaction:
3068                 let mut res = self.feerate_per_kw * cmp::max(HTLC_TIMEOUT_TX_WEIGHT, HTLC_SUCCESS_TX_WEIGHT) / 1000;
3069
3070                 if self.channel_outbound {
3071                         // + the marginal fee increase cost to us in the commitment transaction:
3072                         res += self.feerate_per_kw * COMMITMENT_TX_WEIGHT_PER_HTLC / 1000;
3073                 }
3074
3075                 // + the marginal cost of an input which spends the HTLC-Success/HTLC-Timeout output:
3076                 res += fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal) * SPENDING_INPUT_FOR_A_OUTPUT_WEIGHT / 1000;
3077
3078                 res as u32
3079         }
3080
3081         /// Returns true if we've ever received a message from the remote end for this Channel
3082         pub fn have_received_message(&self) -> bool {
3083                 self.channel_state > (ChannelState::OurInitSent as u32)
3084         }
3085
3086         /// Returns true if this channel is fully established and not known to be closing.
3087         /// Allowed in any state (including after shutdown)
3088         pub fn is_usable(&self) -> bool {
3089                 let mask = ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK;
3090                 (self.channel_state & mask) == (ChannelState::ChannelFunded as u32)
3091         }
3092
3093         /// Returns true if this channel is currently available for use. This is a superset of
3094         /// is_usable() and considers things like the channel being temporarily disabled.
3095         /// Allowed in any state (including after shutdown)
3096         pub fn is_live(&self) -> bool {
3097                 self.is_usable() && (self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32) == 0)
3098         }
3099
3100         /// Returns true if this channel has been marked as awaiting a monitor update to move forward.
3101         /// Allowed in any state (including after shutdown)
3102         pub fn is_awaiting_monitor_update(&self) -> bool {
3103                 (self.channel_state & ChannelState::MonitorUpdateFailed as u32) != 0
3104         }
3105
3106         /// Returns true if funding_created was sent/received.
3107         pub fn is_funding_initiated(&self) -> bool {
3108                 self.channel_state >= ChannelState::FundingCreated as u32
3109         }
3110
3111         /// Returns true if this channel is fully shut down. True here implies that no further actions
3112         /// may/will be taken on this channel, and thus this object should be freed. Any future changes
3113         /// will be handled appropriately by the chain monitor.
3114         pub fn is_shutdown(&self) -> bool {
3115                 if (self.channel_state & ChannelState::ShutdownComplete as u32) == ChannelState::ShutdownComplete as u32  {
3116                         assert!(self.channel_state == ChannelState::ShutdownComplete as u32);
3117                         true
3118                 } else { false }
3119         }
3120
3121         pub fn to_disabled_staged(&mut self) {
3122                 self.network_sync = UpdateStatus::DisabledStaged;
3123         }
3124
3125         pub fn to_disabled_marked(&mut self) {
3126                 self.network_sync = UpdateStatus::DisabledMarked;
3127         }
3128
3129         pub fn to_fresh(&mut self) {
3130                 self.network_sync = UpdateStatus::Fresh;
3131         }
3132
3133         pub fn is_disabled_staged(&self) -> bool {
3134                 self.network_sync == UpdateStatus::DisabledStaged
3135         }
3136
3137         pub fn is_disabled_marked(&self) -> bool {
3138                 self.network_sync == UpdateStatus::DisabledMarked
3139         }
3140
3141         /// Called by channelmanager based on chain blocks being connected.
3142         /// Note that we only need to use this to detect funding_signed, anything else is handled by
3143         /// the channel_monitor.
3144         /// In case of Err, the channel may have been closed, at which point the standard requirements
3145         /// apply - no calls may be made except those explicitly stated to be allowed post-shutdown.
3146         /// Only returns an ErrorAction of DisconnectPeer, if Err.
3147         pub fn block_connected(&mut self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) -> Result<Option<msgs::FundingLocked>, msgs::ErrorMessage> {
3148                 let non_shutdown_state = self.channel_state & (!MULTI_STATE_FLAGS);
3149                 if header.bitcoin_hash() != self.last_block_connected {
3150                         if self.funding_tx_confirmations > 0 {
3151                                 self.funding_tx_confirmations += 1;
3152                         }
3153                 }
3154                 if non_shutdown_state & !(ChannelState::TheirFundingLocked as u32) == ChannelState::FundingSent as u32 {
3155                         for (ref tx, index_in_block) in txn_matched.iter().zip(indexes_of_txn_matched) {
3156                                 if tx.txid() == self.funding_txo.unwrap().txid {
3157                                         let txo_idx = self.funding_txo.unwrap().index as usize;
3158                                         if txo_idx >= tx.output.len() || tx.output[txo_idx].script_pubkey != self.get_funding_redeemscript().to_v0_p2wsh() ||
3159                                                         tx.output[txo_idx].value != self.channel_value_satoshis {
3160                                                 if self.channel_outbound {
3161                                                         // If we generated the funding transaction and it doesn't match what it
3162                                                         // should, the client is really broken and we should just panic and
3163                                                         // tell them off. That said, because hash collisions happen with high
3164                                                         // probability in fuzztarget mode, if we're fuzzing we just close the
3165                                                         // channel and move on.
3166                                                         #[cfg(not(feature = "fuzztarget"))]
3167                                                         panic!("Client called ChannelManager::funding_transaction_generated with bogus transaction!");
3168                                                 }
3169                                                 self.channel_state = ChannelState::ShutdownComplete as u32;
3170                                                 self.update_time_counter += 1;
3171                                                 return Err(msgs::ErrorMessage {
3172                                                         channel_id: self.channel_id(),
3173                                                         data: "funding tx had wrong script/value".to_owned()
3174                                                 });
3175                                         } else {
3176                                                 if self.channel_outbound {
3177                                                         for input in tx.input.iter() {
3178                                                                 if input.witness.is_empty() {
3179                                                                         // We generated a malleable funding transaction, implying we've
3180                                                                         // just exposed ourselves to funds loss to our counterparty.
3181                                                                         #[cfg(not(feature = "fuzztarget"))]
3182                                                                         panic!("Client called ChannelManager::funding_transaction_generated with bogus transaction!");
3183                                                                 }
3184                                                         }
3185                                                 }
3186                                                 self.funding_tx_confirmations = 1;
3187                                                 self.short_channel_id = Some(((height as u64)          << (5*8)) |
3188                                                                              ((*index_in_block as u64) << (2*8)) |
3189                                                                              ((txo_idx as u64)         << (0*8)));
3190                                         }
3191                                 }
3192                         }
3193                 }
3194                 if header.bitcoin_hash() != self.last_block_connected {
3195                         self.last_block_connected = header.bitcoin_hash();
3196                         self.update_time_counter = cmp::max(self.update_time_counter, header.time);
3197                         if let Some(channel_monitor) = self.channel_monitor.as_mut() {
3198                                 channel_monitor.last_block_hash = self.last_block_connected;
3199                         }
3200                         if self.funding_tx_confirmations > 0 {
3201                                 if self.funding_tx_confirmations == self.minimum_depth as u64 {
3202                                         let need_commitment_update = if non_shutdown_state == ChannelState::FundingSent as u32 {
3203                                                 self.channel_state |= ChannelState::OurFundingLocked as u32;
3204                                                 true
3205                                         } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::TheirFundingLocked as u32) {
3206                                                 self.channel_state = ChannelState::ChannelFunded as u32 | (self.channel_state & MULTI_STATE_FLAGS);
3207                                                 self.update_time_counter += 1;
3208                                                 true
3209                                         } else if non_shutdown_state == (ChannelState::FundingSent as u32 | ChannelState::OurFundingLocked as u32) {
3210                                                 // We got a reorg but not enough to trigger a force close, just update
3211                                                 // funding_tx_confirmed_in and return.
3212                                                 false
3213                                         } else if self.channel_state < ChannelState::ChannelFunded as u32 {
3214                                                 panic!("Started confirming a channel in a state pre-FundingSent?: {}", self.channel_state);
3215                                         } else {
3216                                                 // We got a reorg but not enough to trigger a force close, just update
3217                                                 // funding_tx_confirmed_in and return.
3218                                                 false
3219                                         };
3220                                         self.funding_tx_confirmed_in = Some(header.bitcoin_hash());
3221
3222                                         //TODO: Note that this must be a duplicate of the previous commitment point they sent us,
3223                                         //as otherwise we will have a commitment transaction that they can't revoke (well, kinda,
3224                                         //they can by sending two revoke_and_acks back-to-back, but not really). This appears to be
3225                                         //a protocol oversight, but I assume I'm just missing something.
3226                                         if need_commitment_update {
3227                                                 if self.channel_state & (ChannelState::MonitorUpdateFailed as u32) == 0 {
3228                                                         let next_per_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
3229                                                         let next_per_commitment_point = PublicKey::from_secret_key(&self.secp_ctx, &next_per_commitment_secret);
3230                                                         return Ok(Some(msgs::FundingLocked {
3231                                                                 channel_id: self.channel_id,
3232                                                                 next_per_commitment_point: next_per_commitment_point,
3233                                                         }));
3234                                                 } else {
3235                                                         self.monitor_pending_funding_locked = true;
3236                                                         return Ok(None);
3237                                                 }
3238                                         }
3239                                 }
3240                         }
3241                 }
3242                 Ok(None)
3243         }
3244
3245         /// Called by channelmanager based on chain blocks being disconnected.
3246         /// Returns true if we need to close the channel now due to funding transaction
3247         /// unconfirmation/reorg.
3248         pub fn block_disconnected(&mut self, header: &BlockHeader) -> bool {
3249                 if self.funding_tx_confirmations > 0 {
3250                         self.funding_tx_confirmations -= 1;
3251                         if self.funding_tx_confirmations == UNCONF_THRESHOLD as u64 {
3252                                 return true;
3253                         }
3254                 }
3255                 if Some(header.bitcoin_hash()) == self.funding_tx_confirmed_in {
3256                         self.funding_tx_confirmations = self.minimum_depth as u64 - 1;
3257                 }
3258                 self.last_block_connected = header.bitcoin_hash();
3259                 if let Some(channel_monitor) = self.channel_monitor.as_mut() {
3260                         channel_monitor.last_block_hash = self.last_block_connected;
3261                 }
3262                 false
3263         }
3264
3265         // Methods to get unprompted messages to send to the remote end (or where we already returned
3266         // something in the handler for the message that prompted this message):
3267
3268         pub fn get_open_channel<F: Deref>(&self, chain_hash: Sha256dHash, fee_estimator: &F) -> msgs::OpenChannel
3269                 where F::Target: FeeEstimator
3270         {
3271                 if !self.channel_outbound {
3272                         panic!("Tried to open a channel for an inbound channel?");
3273                 }
3274                 if self.channel_state != ChannelState::OurInitSent as u32 {
3275                         panic!("Cannot generate an open_channel after we've moved forward");
3276                 }
3277
3278                 if self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
3279                         panic!("Tried to send an open_channel for a channel that has already advanced");
3280                 }
3281
3282                 let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
3283
3284                 msgs::OpenChannel {
3285                         chain_hash: chain_hash,
3286                         temporary_channel_id: self.channel_id,
3287                         funding_satoshis: self.channel_value_satoshis,
3288                         push_msat: self.channel_value_satoshis * 1000 - self.value_to_self_msat,
3289                         dust_limit_satoshis: self.our_dust_limit_satoshis,
3290                         max_htlc_value_in_flight_msat: Channel::<ChanSigner>::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
3291                         channel_reserve_satoshis: Channel::<ChanSigner>::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
3292                         htlc_minimum_msat: self.our_htlc_minimum_msat,
3293                         feerate_per_kw: fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Background) as u32,
3294                         to_self_delay: self.our_to_self_delay,
3295                         max_accepted_htlcs: OUR_MAX_HTLCS,
3296                         funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.funding_key()),
3297                         revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.revocation_base_key()),
3298                         payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.payment_base_key()),
3299                         delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.delayed_payment_base_key()),
3300                         htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.htlc_base_key()),
3301                         first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret),
3302                         channel_flags: if self.config.announced_channel {1} else {0},
3303                         shutdown_scriptpubkey: OptionalField::Present(if self.config.commit_upfront_shutdown_pubkey { self.get_closing_scriptpubkey() } else { Builder::new().into_script() })
3304                 }
3305         }
3306
3307         pub fn get_accept_channel(&self) -> msgs::AcceptChannel {
3308                 if self.channel_outbound {
3309                         panic!("Tried to send accept_channel for an outbound channel?");
3310                 }
3311                 if self.channel_state != (ChannelState::OurInitSent as u32) | (ChannelState::TheirInitSent as u32) {
3312                         panic!("Tried to send accept_channel after channel had moved forward");
3313                 }
3314                 if self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
3315                         panic!("Tried to send an accept_channel for a channel that has already advanced");
3316                 }
3317
3318                 let local_commitment_secret = self.build_local_commitment_secret(self.cur_local_commitment_transaction_number);
3319
3320                 msgs::AcceptChannel {
3321                         temporary_channel_id: self.channel_id,
3322                         dust_limit_satoshis: self.our_dust_limit_satoshis,
3323                         max_htlc_value_in_flight_msat: Channel::<ChanSigner>::get_our_max_htlc_value_in_flight_msat(self.channel_value_satoshis),
3324                         channel_reserve_satoshis: Channel::<ChanSigner>::get_our_channel_reserve_satoshis(self.channel_value_satoshis),
3325                         htlc_minimum_msat: self.our_htlc_minimum_msat,
3326                         minimum_depth: self.minimum_depth,
3327                         to_self_delay: self.our_to_self_delay,
3328                         max_accepted_htlcs: OUR_MAX_HTLCS,
3329                         funding_pubkey: PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.funding_key()),
3330                         revocation_basepoint: PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.revocation_base_key()),
3331                         payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.payment_base_key()),
3332                         delayed_payment_basepoint: PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.delayed_payment_base_key()),
3333                         htlc_basepoint: PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.htlc_base_key()),
3334                         first_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &local_commitment_secret),
3335                         shutdown_scriptpubkey: OptionalField::Present(if self.config.commit_upfront_shutdown_pubkey { self.get_closing_scriptpubkey() } else { Builder::new().into_script() })
3336                 }
3337         }
3338
3339         /// If an Err is returned, it is a ChannelError::Close (for get_outbound_funding_created)
3340         fn get_outbound_funding_created_signature(&mut self) -> Result<(Signature, Transaction), ChannelError> {
3341                 let remote_keys = self.build_remote_transaction_keys()?;
3342                 let remote_initial_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, false, self.feerate_per_kw).0;
3343                 Ok((self.local_keys.sign_remote_commitment(self.feerate_per_kw, &remote_initial_commitment_tx, &remote_keys, &Vec::new(), self.our_to_self_delay, &self.secp_ctx)
3344                                 .map_err(|_| ChannelError::Close("Failed to get signatures for new commitment_signed"))?.0, remote_initial_commitment_tx))
3345         }
3346
3347         /// Updates channel state with knowledge of the funding transaction's txid/index, and generates
3348         /// a funding_created message for the remote peer.
3349         /// Panics if called at some time other than immediately after initial handshake, if called twice,
3350         /// or if called on an inbound channel.
3351         /// Note that channel_id changes during this call!
3352         /// Do NOT broadcast the funding transaction until after a successful funding_signed call!
3353         /// If an Err is returned, it is a ChannelError::Close.
3354         pub fn get_outbound_funding_created(&mut self, funding_txo: OutPoint) -> Result<(msgs::FundingCreated, ChannelMonitor<ChanSigner>), ChannelError> {
3355                 if !self.channel_outbound {
3356                         panic!("Tried to create outbound funding_created message on an inbound channel!");
3357                 }
3358                 if self.channel_state != (ChannelState::OurInitSent as u32 | ChannelState::TheirInitSent as u32) {
3359                         panic!("Tried to get a funding_created messsage at a time other than immediately after initial handshake completion (or tried to get funding_created twice)");
3360                 }
3361                 if self.commitment_secrets.get_min_seen_secret() != (1 << 48) ||
3362                                 self.cur_remote_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER ||
3363                                 self.cur_local_commitment_transaction_number != INITIAL_COMMITMENT_NUMBER {
3364                         panic!("Should not have advanced channel commitment tx numbers prior to funding_created");
3365                 }
3366
3367                 self.funding_txo = Some(funding_txo.clone());
3368                 let (our_signature, commitment_tx) = match self.get_outbound_funding_created_signature() {
3369                         Ok(res) => res,
3370                         Err(e) => {
3371                                 log_error!(self, "Got bad signatures: {:?}!", e);
3372                                 self.funding_txo = None;
3373                                 return Err(e);
3374                         }
3375                 };
3376
3377                 let temporary_channel_id = self.channel_id;
3378
3379                 // Now that we're past error-generating stuff, update our local state:
3380
3381                 let their_pubkeys = self.their_pubkeys.as_ref().unwrap();
3382                 let funding_redeemscript = self.get_funding_redeemscript();
3383                 let funding_txo_script = funding_redeemscript.to_v0_p2wsh();
3384                 macro_rules! create_monitor {
3385                         () => { {
3386                                 let mut channel_monitor = ChannelMonitor::new(self.local_keys.clone(),
3387                                                                               &self.shutdown_pubkey, self.our_to_self_delay,
3388                                                                               &self.destination_script, (funding_txo, funding_txo_script.clone()),
3389                                                                               &their_pubkeys.htlc_basepoint, &their_pubkeys.delayed_payment_basepoint,
3390                                                                               self.their_to_self_delay, funding_redeemscript.clone(), self.channel_value_satoshis,
3391                                                                               self.get_commitment_transaction_number_obscure_factor(),
3392                                                                               self.logger.clone());
3393
3394                                 channel_monitor.provide_latest_remote_commitment_tx_info(&commitment_tx, Vec::new(), self.cur_remote_commitment_transaction_number, self.their_cur_commitment_point.unwrap());
3395                                 channel_monitor
3396                         } }
3397                 }
3398
3399                 self.channel_monitor = Some(create_monitor!());
3400                 let channel_monitor = create_monitor!();
3401
3402                 self.channel_state = ChannelState::FundingCreated as u32;
3403                 self.channel_id = funding_txo.to_channel_id();
3404                 self.cur_remote_commitment_transaction_number -= 1;
3405
3406                 Ok((msgs::FundingCreated {
3407                         temporary_channel_id: temporary_channel_id,
3408                         funding_txid: funding_txo.txid,
3409                         funding_output_index: funding_txo.index,
3410                         signature: our_signature
3411                 }, channel_monitor))
3412         }
3413
3414         /// Gets an UnsignedChannelAnnouncement, as well as a signature covering it using our
3415         /// bitcoin_key, if available, for this channel. The channel must be publicly announceable and
3416         /// available for use (have exchanged FundingLocked messages in both directions). Should be used
3417         /// for both loose and in response to an AnnouncementSignatures message from the remote peer.
3418         /// Will only fail if we're not in a state where channel_announcement may be sent (including
3419         /// closing).
3420         /// Note that the "channel must be funded" requirement is stricter than BOLT 7 requires - see
3421         /// https://github.com/lightningnetwork/lightning-rfc/issues/468
3422         pub fn get_channel_announcement(&self, our_node_id: PublicKey, chain_hash: Sha256dHash) -> Result<(msgs::UnsignedChannelAnnouncement, Signature), ChannelError> {
3423                 if !self.config.announced_channel {
3424                         return Err(ChannelError::Ignore("Channel is not available for public announcements"));
3425                 }
3426                 if self.channel_state & (ChannelState::ChannelFunded as u32) == 0 {
3427                         return Err(ChannelError::Ignore("Cannot get a ChannelAnnouncement until the channel funding has been locked"));
3428                 }
3429                 if (self.channel_state & (ChannelState::LocalShutdownSent as u32 | ChannelState::ShutdownComplete as u32)) != 0 {
3430                         return Err(ChannelError::Ignore("Cannot get a ChannelAnnouncement once the channel is closing"));
3431                 }
3432
3433                 let were_node_one = our_node_id.serialize()[..] < self.their_node_id.serialize()[..];
3434                 let our_bitcoin_key = PublicKey::from_secret_key(&self.secp_ctx, self.local_keys.funding_key());
3435
3436                 let msg = msgs::UnsignedChannelAnnouncement {
3437                         features: ChannelFeatures::supported(),
3438                         chain_hash: chain_hash,
3439                         short_channel_id: self.get_short_channel_id().unwrap(),
3440                         node_id_1: if were_node_one { our_node_id } else { self.get_their_node_id() },
3441                         node_id_2: if were_node_one { self.get_their_node_id() } else { our_node_id },
3442                         bitcoin_key_1: if were_node_one { our_bitcoin_key } else { self.their_funding_pubkey().clone() },
3443                         bitcoin_key_2: if were_node_one { self.their_funding_pubkey().clone() } else { our_bitcoin_key },
3444                         excess_data: Vec::new(),
3445                 };
3446
3447                 let sig = self.local_keys.sign_channel_announcement(&msg, &self.secp_ctx)
3448                         .map_err(|_| ChannelError::Ignore("Signer rejected channel_announcement"))?;
3449
3450                 Ok((msg, sig))
3451         }
3452
3453         /// May panic if called on a channel that wasn't immediately-previously
3454         /// self.remove_uncommitted_htlcs_and_mark_paused()'d
3455         pub fn get_channel_reestablish(&self) -> msgs::ChannelReestablish {
3456                 assert_eq!(self.channel_state & ChannelState::PeerDisconnected as u32, ChannelState::PeerDisconnected as u32);
3457                 assert_ne!(self.cur_remote_commitment_transaction_number, INITIAL_COMMITMENT_NUMBER);
3458                 let data_loss_protect = if self.cur_remote_commitment_transaction_number + 1 < INITIAL_COMMITMENT_NUMBER {
3459                         let remote_last_secret = self.commitment_secrets.get_secret(self.cur_remote_commitment_transaction_number + 2).unwrap();
3460                         log_trace!(self, "Enough info to generate a Data Loss Protect with per_commitment_secret {}", log_bytes!(remote_last_secret));
3461                         OptionalField::Present(DataLossProtect {
3462                                 your_last_per_commitment_secret: remote_last_secret,
3463                                 my_current_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number + 1))
3464                         })
3465                 } else {
3466                         log_info!(self, "Sending a data_loss_protect with no previous remote per_commitment_secret");
3467                         OptionalField::Present(DataLossProtect {
3468                                 your_last_per_commitment_secret: [0;32],
3469                                 my_current_per_commitment_point: PublicKey::from_secret_key(&self.secp_ctx, &self.build_local_commitment_secret(self.cur_local_commitment_transaction_number + 1))
3470                         })
3471                 };
3472                 msgs::ChannelReestablish {
3473                         channel_id: self.channel_id(),
3474                         // The protocol has two different commitment number concepts - the "commitment
3475                         // transaction number", which starts from 0 and counts up, and the "revocation key
3476                         // index" which starts at INITIAL_COMMITMENT_NUMBER and counts down. We track
3477                         // commitment transaction numbers by the index which will be used to reveal the
3478                         // revocation key for that commitment transaction, which means we have to convert them
3479                         // to protocol-level commitment numbers here...
3480
3481                         // next_local_commitment_number is the next commitment_signed number we expect to
3482                         // receive (indicating if they need to resend one that we missed).
3483                         next_local_commitment_number: INITIAL_COMMITMENT_NUMBER - self.cur_local_commitment_transaction_number,
3484                         // We have to set next_remote_commitment_number to the next revoke_and_ack we expect to
3485                         // receive, however we track it by the next commitment number for a remote transaction
3486                         // (which is one further, as they always revoke previous commitment transaction, not
3487                         // the one we send) so we have to decrement by 1. Note that if
3488                         // cur_remote_commitment_transaction_number is INITIAL_COMMITMENT_NUMBER we will have
3489                         // dropped this channel on disconnect as it hasn't yet reached FundingSent so we can't
3490                         // overflow here.
3491                         next_remote_commitment_number: INITIAL_COMMITMENT_NUMBER - self.cur_remote_commitment_transaction_number - 1,
3492                         data_loss_protect,
3493                 }
3494         }
3495
3496
3497         // Send stuff to our remote peers:
3498
3499         /// Adds a pending outbound HTLC to this channel, note that you probably want
3500         /// send_htlc_and_commit instead cause you'll want both messages at once.
3501         /// This returns an option instead of a pure UpdateAddHTLC as we may be in a state where we are
3502         /// waiting on the remote peer to send us a revoke_and_ack during which time we cannot add new
3503         /// HTLCs on the wire or we wouldn't be able to determine what they actually ACK'ed.
3504         /// You MUST call send_commitment prior to any other calls on this Channel
3505         /// If an Err is returned, it's a ChannelError::Ignore!
3506         pub fn send_htlc(&mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource, onion_routing_packet: msgs::OnionPacket) -> Result<Option<msgs::UpdateAddHTLC>, ChannelError> {
3507                 if (self.channel_state & (ChannelState::ChannelFunded as u32 | BOTH_SIDES_SHUTDOWN_MASK)) != (ChannelState::ChannelFunded as u32) {
3508                         return Err(ChannelError::Ignore("Cannot send HTLC until channel is fully established and we haven't started shutting down"));
3509                 }
3510
3511                 if amount_msat > self.channel_value_satoshis * 1000 {
3512                         return Err(ChannelError::Ignore("Cannot send more than the total value of the channel"));
3513                 }
3514
3515                 if amount_msat == 0 {
3516                         return Err(ChannelError::Ignore("Cannot send 0-msat HTLC"));
3517                 }
3518
3519                 if amount_msat < self.their_htlc_minimum_msat {
3520                         return Err(ChannelError::Ignore("Cannot send less than their minimum HTLC value"));
3521                 }
3522
3523                 if (self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32)) != 0 {
3524                         // Note that this should never really happen, if we're !is_live() on receipt of an
3525                         // incoming HTLC for relay will result in us rejecting the HTLC and we won't allow
3526                         // the user to send directly into a !is_live() channel. However, if we
3527                         // disconnected during the time the previous hop was doing the commitment dance we may
3528                         // end up getting here after the forwarding delay. In any case, returning an
3529                         // IgnoreError will get ChannelManager to do the right thing and fail backwards now.
3530                         return Err(ChannelError::Ignore("Cannot send an HTLC while disconnected/frozen for channel monitor update"));
3531                 }
3532
3533                 let (outbound_htlc_count, htlc_outbound_value_msat) = self.get_outbound_pending_htlc_stats();
3534                 if outbound_htlc_count + 1 > self.their_max_accepted_htlcs as u32 {
3535                         return Err(ChannelError::Ignore("Cannot push more than their max accepted HTLCs"));
3536                 }
3537                 // Check their_max_htlc_value_in_flight_msat
3538                 if htlc_outbound_value_msat + amount_msat > self.their_max_htlc_value_in_flight_msat {
3539                         return Err(ChannelError::Ignore("Cannot send value that would put us over the max HTLC value in flight our peer will accept"));
3540                 }
3541
3542                 // Check self.their_channel_reserve_satoshis (the amount we must keep as
3543                 // reserve for them to have something to claim if we misbehave)
3544                 if self.value_to_self_msat < self.their_channel_reserve_satoshis * 1000 + amount_msat + htlc_outbound_value_msat {
3545                         return Err(ChannelError::Ignore("Cannot send value that would put us over their reserve value"));
3546                 }
3547
3548                 //TODO: Check cltv_expiry? Do this in channel manager?
3549
3550                 // Now update local state:
3551                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
3552                         self.holding_cell_htlc_updates.push(HTLCUpdateAwaitingACK::AddHTLC {
3553                                 amount_msat: amount_msat,
3554                                 payment_hash: payment_hash,
3555                                 cltv_expiry: cltv_expiry,
3556                                 source,
3557                                 onion_routing_packet: onion_routing_packet,
3558                         });
3559                         return Ok(None);
3560                 }
3561
3562                 self.pending_outbound_htlcs.push(OutboundHTLCOutput {
3563                         htlc_id: self.next_local_htlc_id,
3564                         amount_msat: amount_msat,
3565                         payment_hash: payment_hash.clone(),
3566                         cltv_expiry: cltv_expiry,
3567                         state: OutboundHTLCState::LocalAnnounced(Box::new(onion_routing_packet.clone())),
3568                         source,
3569                 });
3570
3571                 let res = msgs::UpdateAddHTLC {
3572                         channel_id: self.channel_id,
3573                         htlc_id: self.next_local_htlc_id,
3574                         amount_msat: amount_msat,
3575                         payment_hash: payment_hash,
3576                         cltv_expiry: cltv_expiry,
3577                         onion_routing_packet: onion_routing_packet,
3578                 };
3579                 self.next_local_htlc_id += 1;
3580
3581                 Ok(Some(res))
3582         }
3583
3584         /// Creates a signed commitment transaction to send to the remote peer.
3585         /// Always returns a ChannelError::Close if an immediately-preceding (read: the
3586         /// last call to this Channel) send_htlc returned Ok(Some(_)) and there is an Err.
3587         /// May panic if called except immediately after a successful, Ok(Some(_))-returning send_htlc.
3588         pub fn send_commitment(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitorUpdate), ChannelError> {
3589                 if (self.channel_state & (ChannelState::ChannelFunded as u32)) != (ChannelState::ChannelFunded as u32) {
3590                         panic!("Cannot create commitment tx until channel is fully established");
3591                 }
3592                 if (self.channel_state & (ChannelState::AwaitingRemoteRevoke as u32)) == (ChannelState::AwaitingRemoteRevoke as u32) {
3593                         panic!("Cannot create commitment tx until remote revokes their previous commitment");
3594                 }
3595                 if (self.channel_state & (ChannelState::PeerDisconnected as u32)) == (ChannelState::PeerDisconnected as u32) {
3596                         panic!("Cannot create commitment tx while disconnected, as send_htlc will have returned an Err so a send_commitment precondition has been violated");
3597                 }
3598                 if (self.channel_state & (ChannelState::MonitorUpdateFailed as u32)) == (ChannelState::MonitorUpdateFailed as u32) {
3599                         panic!("Cannot create commitment tx while awaiting monitor update unfreeze, as send_htlc will have returned an Err so a send_commitment precondition has been violated");
3600                 }
3601                 let mut have_updates = self.pending_update_fee.is_some();
3602                 for htlc in self.pending_outbound_htlcs.iter() {
3603                         if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
3604                                 have_updates = true;
3605                         }
3606                         if have_updates { break; }
3607                 }
3608                 for htlc in self.pending_inbound_htlcs.iter() {
3609                         if let InboundHTLCState::LocalRemoved(_) = htlc.state {
3610                                 have_updates = true;
3611                         }
3612                         if have_updates { break; }
3613                 }
3614                 if !have_updates {
3615                         panic!("Cannot create commitment tx until we have some updates to send");
3616                 }
3617                 self.send_commitment_no_status_check()
3618         }
3619         /// Only fails in case of bad keys
3620         fn send_commitment_no_status_check(&mut self) -> Result<(msgs::CommitmentSigned, ChannelMonitorUpdate), ChannelError> {
3621                 // We can upgrade the status of some HTLCs that are waiting on a commitment, even if we
3622                 // fail to generate this, we still are at least at a position where upgrading their status
3623                 // is acceptable.
3624                 for htlc in self.pending_inbound_htlcs.iter_mut() {
3625                         let new_state = if let &InboundHTLCState::AwaitingRemoteRevokeToAnnounce(ref forward_info) = &htlc.state {
3626                                 Some(InboundHTLCState::AwaitingAnnouncedRemoteRevoke(forward_info.clone()))
3627                         } else { None };
3628                         if let Some(state) = new_state {
3629                                 htlc.state = state;
3630                         }
3631                 }
3632                 for htlc in self.pending_outbound_htlcs.iter_mut() {
3633                         if let Some(fail_reason) = if let &mut OutboundHTLCState::AwaitingRemoteRevokeToRemove(ref mut fail_reason) = &mut htlc.state {
3634                                 Some(fail_reason.take())
3635                         } else { None } {
3636                                 htlc.state = OutboundHTLCState::AwaitingRemovedRemoteRevoke(fail_reason);
3637                         }
3638                 }
3639                 self.resend_order = RAACommitmentOrder::RevokeAndACKFirst;
3640
3641                 let (res, remote_commitment_tx, htlcs) = match self.send_commitment_no_state_update() {
3642                         Ok((res, (remote_commitment_tx, mut htlcs))) => {
3643                                 // Update state now that we've passed all the can-fail calls...
3644                                 let htlcs_no_ref: Vec<(HTLCOutputInCommitment, Option<Box<HTLCSource>>)> =
3645                                         htlcs.drain(..).map(|(htlc, htlc_source)| (htlc, htlc_source.map(|source_ref| Box::new(source_ref.clone())))).collect();
3646                                 (res, remote_commitment_tx, htlcs_no_ref)
3647                         },
3648                         Err(e) => return Err(e),
3649                 };
3650
3651                 self.latest_monitor_update_id += 1;
3652                 let monitor_update = ChannelMonitorUpdate {
3653                         update_id: self.latest_monitor_update_id,
3654                         updates: vec![ChannelMonitorUpdateStep::LatestRemoteCommitmentTXInfo {
3655                                 unsigned_commitment_tx: remote_commitment_tx.clone(),
3656                                 htlc_outputs: htlcs.clone(),
3657                                 commitment_number: self.cur_remote_commitment_transaction_number,
3658                                 their_revocation_point: self.their_cur_commitment_point.unwrap()
3659                         }]
3660                 };
3661                 self.channel_monitor.as_mut().unwrap().update_monitor_ooo(monitor_update.clone()).unwrap();
3662                 self.channel_state |= ChannelState::AwaitingRemoteRevoke as u32;
3663                 Ok((res, monitor_update))
3664         }
3665
3666         /// Only fails in case of bad keys. Used for channel_reestablish commitment_signed generation
3667         /// when we shouldn't change HTLC/channel state.
3668         fn send_commitment_no_state_update(&self) -> Result<(msgs::CommitmentSigned, (Transaction, Vec<(HTLCOutputInCommitment, Option<&HTLCSource>)>)), ChannelError> {
3669                 let mut feerate_per_kw = self.feerate_per_kw;
3670                 if let Some(feerate) = self.pending_update_fee {
3671                         if self.channel_outbound {
3672                                 feerate_per_kw = feerate;
3673                         }
3674                 }
3675
3676                 let remote_keys = self.build_remote_transaction_keys()?;
3677                 let remote_commitment_tx = self.build_commitment_transaction(self.cur_remote_commitment_transaction_number, &remote_keys, false, true, feerate_per_kw);
3678                 let (signature, htlc_signatures);
3679
3680                 {
3681                         let mut htlcs = Vec::with_capacity(remote_commitment_tx.2.len());
3682                         for &(ref htlc, _) in remote_commitment_tx.2.iter() {
3683                                 htlcs.push(htlc);
3684                         }
3685
3686                         let res = self.local_keys.sign_remote_commitment(feerate_per_kw, &remote_commitment_tx.0, &remote_keys, &htlcs, self.our_to_self_delay, &self.secp_ctx)
3687                                 .map_err(|_| ChannelError::Close("Failed to get signatures for new commitment_signed"))?;
3688                         signature = res.0;
3689                         htlc_signatures = res.1;
3690
3691                         log_trace!(self, "Signed remote commitment tx {} with redeemscript {} -> {}",
3692                                 encode::serialize_hex(&remote_commitment_tx.0),
3693                                 encode::serialize_hex(&self.get_funding_redeemscript()),
3694                                 log_bytes!(signature.serialize_compact()[..]));
3695
3696                         for (ref htlc_sig, ref htlc) in htlc_signatures.iter().zip(htlcs) {
3697                                 log_trace!(self, "Signed remote HTLC tx {} with redeemscript {} with pubkey {} -> {}",
3698                                         encode::serialize_hex(&chan_utils::build_htlc_transaction(&remote_commitment_tx.0.txid(), feerate_per_kw, self.our_to_self_delay, htlc, &remote_keys.a_delayed_payment_key, &remote_keys.revocation_key)),
3699                                         encode::serialize_hex(&chan_utils::get_htlc_redeemscript(&htlc, &remote_keys)),
3700                                         log_bytes!(remote_keys.a_htlc_key.serialize()),
3701                                         log_bytes!(htlc_sig.serialize_compact()[..]));
3702                         }
3703                 }
3704
3705                 Ok((msgs::CommitmentSigned {
3706                         channel_id: self.channel_id,
3707                         signature,
3708                         htlc_signatures,
3709                 }, (remote_commitment_tx.0, remote_commitment_tx.2)))
3710         }
3711
3712         /// Adds a pending outbound HTLC to this channel, and creates a signed commitment transaction
3713         /// to send to the remote peer in one go.
3714         /// Shorthand for calling send_htlc() followed by send_commitment(), see docs on those for
3715         /// more info.
3716         pub fn send_htlc_and_commit(&mut self, amount_msat: u64, payment_hash: PaymentHash, cltv_expiry: u32, source: HTLCSource, onion_routing_packet: msgs::OnionPacket) -> Result<Option<(msgs::UpdateAddHTLC, msgs::CommitmentSigned, ChannelMonitorUpdate)>, ChannelError> {
3717                 match self.send_htlc(amount_msat, payment_hash, cltv_expiry, source, onion_routing_packet)? {
3718                         Some(update_add_htlc) => {
3719                                 let (commitment_signed, monitor_update) = self.send_commitment_no_status_check()?;
3720                                 Ok(Some((update_add_htlc, commitment_signed, monitor_update)))
3721                         },
3722                         None => Ok(None)
3723                 }
3724         }
3725
3726         /// Begins the shutdown process, getting a message for the remote peer and returning all
3727         /// holding cell HTLCs for payment failure.
3728         pub fn get_shutdown(&mut self) -> Result<(msgs::Shutdown, Vec<(HTLCSource, PaymentHash)>), APIError> {
3729                 for htlc in self.pending_outbound_htlcs.iter() {
3730                         if let OutboundHTLCState::LocalAnnounced(_) = htlc.state {
3731                                 return Err(APIError::APIMisuseError{err: "Cannot begin shutdown with pending HTLCs. Process pending events first"});
3732                         }
3733                 }
3734                 if self.channel_state & BOTH_SIDES_SHUTDOWN_MASK != 0 {
3735                         if (self.channel_state & ChannelState::LocalShutdownSent as u32) == ChannelState::LocalShutdownSent as u32 {
3736                                 return Err(APIError::APIMisuseError{err: "Shutdown already in progress"});
3737                         }
3738                         else if (self.channel_state & ChannelState::RemoteShutdownSent as u32) == ChannelState::RemoteShutdownSent as u32 {
3739                                 return Err(APIError::ChannelUnavailable{err: "Shutdown already in progress by remote"});
3740                         }
3741                 }
3742                 assert_eq!(self.channel_state & ChannelState::ShutdownComplete as u32, 0);
3743                 if self.channel_state & (ChannelState::PeerDisconnected as u32 | ChannelState::MonitorUpdateFailed as u32) != 0 {
3744                         return Err(APIError::ChannelUnavailable{err: "Cannot begin shutdown while peer is disconnected or we're waiting on a monitor update, maybe force-close instead?"});
3745                 }
3746
3747                 let our_closing_script = self.get_closing_scriptpubkey();
3748
3749                 // From here on out, we may not fail!
3750                 if self.channel_state < ChannelState::FundingSent as u32 {
3751                         self.channel_state = ChannelState::ShutdownComplete as u32;
3752                 } else {
3753                         self.channel_state |= ChannelState::LocalShutdownSent as u32;
3754                 }
3755                 self.update_time_counter += 1;
3756
3757                 // Go ahead and drop holding cell updates as we'd rather fail payments than wait to send
3758                 // our shutdown until we've committed all of the pending changes.
3759                 self.holding_cell_update_fee = None;
3760                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
3761                 self.holding_cell_htlc_updates.retain(|htlc_update| {
3762                         match htlc_update {
3763                                 &HTLCUpdateAwaitingACK::AddHTLC { ref payment_hash, ref source, .. } => {
3764                                         dropped_outbound_htlcs.push((source.clone(), payment_hash.clone()));
3765                                         false
3766                                 },
3767                                 _ => true
3768                         }
3769                 });
3770
3771                 Ok((msgs::Shutdown {
3772                         channel_id: self.channel_id,
3773                         scriptpubkey: our_closing_script,
3774                 }, dropped_outbound_htlcs))
3775         }
3776
3777         /// Gets the latest commitment transaction and any dependent transactions for relay (forcing
3778         /// shutdown of this channel - no more calls into this Channel may be made afterwards except
3779         /// those explicitly stated to be allowed after shutdown completes, eg some simple getters).
3780         /// Also returns the list of payment_hashes for channels which we can safely fail backwards
3781         /// immediately (others we will have to allow to time out).
3782         pub fn force_shutdown(&mut self, should_broadcast: bool) -> (Option<OutPoint>, ChannelMonitorUpdate, Vec<(HTLCSource, PaymentHash)>) {
3783                 assert!(self.channel_state != ChannelState::ShutdownComplete as u32);
3784
3785                 // We go ahead and "free" any holding cell HTLCs or HTLCs we haven't yet committed to and
3786                 // return them to fail the payment.
3787                 let mut dropped_outbound_htlcs = Vec::with_capacity(self.holding_cell_htlc_updates.len());
3788                 for htlc_update in self.holding_cell_htlc_updates.drain(..) {
3789                         match htlc_update {
3790                                 HTLCUpdateAwaitingACK::AddHTLC { source, payment_hash, .. } => {
3791                                         dropped_outbound_htlcs.push((source, payment_hash));
3792                                 },
3793                                 _ => {}
3794                         }
3795                 }
3796
3797                 for _htlc in self.pending_outbound_htlcs.drain(..) {
3798                         //TODO: Do something with the remaining HTLCs
3799                         //(we need to have the ChannelManager monitor them so we can claim the inbound HTLCs
3800                         //which correspond)
3801                 }
3802
3803                 self.channel_state = ChannelState::ShutdownComplete as u32;
3804                 self.update_time_counter += 1;
3805                 self.latest_monitor_update_id += 1;
3806                 (self.funding_txo.clone(), ChannelMonitorUpdate {
3807                         update_id: self.latest_monitor_update_id,
3808                         updates: vec![ChannelMonitorUpdateStep::ChannelForceClosed { should_broadcast }],
3809                 }, dropped_outbound_htlcs)
3810         }
3811 }
3812
3813 const SERIALIZATION_VERSION: u8 = 1;
3814 const MIN_SERIALIZATION_VERSION: u8 = 1;
3815
3816 impl Writeable for InboundHTLCRemovalReason {
3817         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
3818                 match self {
3819                         &InboundHTLCRemovalReason::FailRelay(ref error_packet) => {
3820                                 0u8.write(writer)?;
3821                                 error_packet.write(writer)?;
3822                         },
3823                         &InboundHTLCRemovalReason::FailMalformed((ref onion_hash, ref err_code)) => {
3824                                 1u8.write(writer)?;
3825                                 onion_hash.write(writer)?;
3826                                 err_code.write(writer)?;
3827                         },
3828                         &InboundHTLCRemovalReason::Fulfill(ref payment_preimage) => {
3829                                 2u8.write(writer)?;
3830                                 payment_preimage.write(writer)?;
3831                         },
3832                 }
3833                 Ok(())
3834         }
3835 }
3836
3837 impl Readable for InboundHTLCRemovalReason {
3838         fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Self, DecodeError> {
3839                 Ok(match <u8 as Readable>::read(reader)? {
3840                         0 => InboundHTLCRemovalReason::FailRelay(Readable::read(reader)?),
3841                         1 => InboundHTLCRemovalReason::FailMalformed((Readable::read(reader)?, Readable::read(reader)?)),
3842                         2 => InboundHTLCRemovalReason::Fulfill(Readable::read(reader)?),
3843                         _ => return Err(DecodeError::InvalidValue),
3844                 })
3845         }
3846 }
3847
3848 impl<ChanSigner: ChannelKeys + Writeable> Writeable for Channel<ChanSigner> {
3849         fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
3850                 // Note that we write out as if remove_uncommitted_htlcs_and_mark_paused had just been
3851                 // called but include holding cell updates (and obviously we don't modify self).
3852
3853                 writer.write_all(&[SERIALIZATION_VERSION; 1])?;
3854                 writer.write_all(&[MIN_SERIALIZATION_VERSION; 1])?;
3855
3856                 self.user_id.write(writer)?;
3857                 self.config.write(writer)?;
3858
3859                 self.channel_id.write(writer)?;
3860                 (self.channel_state | ChannelState::PeerDisconnected as u32).write(writer)?;
3861                 self.channel_outbound.write(writer)?;
3862                 self.channel_value_satoshis.write(writer)?;
3863
3864                 self.latest_monitor_update_id.write(writer)?;
3865
3866                 self.local_keys.write(writer)?;
3867                 self.shutdown_pubkey.write(writer)?;
3868                 self.destination_script.write(writer)?;
3869
3870                 self.cur_local_commitment_transaction_number.write(writer)?;
3871                 self.cur_remote_commitment_transaction_number.write(writer)?;
3872                 self.value_to_self_msat.write(writer)?;
3873
3874                 let mut dropped_inbound_htlcs = 0;
3875                 for htlc in self.pending_inbound_htlcs.iter() {
3876                         if let InboundHTLCState::RemoteAnnounced(_) = htlc.state {
3877                                 dropped_inbound_htlcs += 1;
3878                         }
3879                 }
3880                 (self.pending_inbound_htlcs.len() as u64 - dropped_inbound_htlcs).write(writer)?;
3881                 for htlc in self.pending_inbound_htlcs.iter() {
3882                         if let &InboundHTLCState::RemoteAnnounced(_) = &htlc.state {
3883                                 continue; // Drop
3884                         }
3885                         htlc.htlc_id.write(writer)?;
3886                         htlc.amount_msat.write(writer)?;
3887                         htlc.cltv_expiry.write(writer)?;
3888                         htlc.payment_hash.write(writer)?;
3889                         match &htlc.state {
3890                                 &InboundHTLCState::RemoteAnnounced(_) => unreachable!(),
3891                                 &InboundHTLCState::AwaitingRemoteRevokeToAnnounce(ref htlc_state) => {
3892                                         1u8.write(writer)?;
3893                                         htlc_state.write(writer)?;
3894                                 },
3895                                 &InboundHTLCState::AwaitingAnnouncedRemoteRevoke(ref htlc_state) => {
3896                                         2u8.write(writer)?;
3897                                         htlc_state.write(writer)?;
3898                                 },
3899                                 &InboundHTLCState::Committed => {
3900                                         3u8.write(writer)?;
3901                                 },
3902                                 &InboundHTLCState::LocalRemoved(ref removal_reason) => {
3903                                         4u8.write(writer)?;
3904                                         removal_reason.write(writer)?;
3905                                 },
3906                         }
3907                 }
3908
3909                 (self.pending_outbound_htlcs.len() as u64).write(writer)?;
3910                 for htlc in self.pending_outbound_htlcs.iter() {
3911                         htlc.htlc_id.write(writer)?;
3912                         htlc.amount_msat.write(writer)?;
3913                         htlc.cltv_expiry.write(writer)?;
3914                         htlc.payment_hash.write(writer)?;
3915                         htlc.source.write(writer)?;
3916                         match &htlc.state {
3917                                 &OutboundHTLCState::LocalAnnounced(ref onion_packet) => {
3918                                         0u8.write(writer)?;
3919                                         onion_packet.write(writer)?;
3920                                 },
3921                                 &OutboundHTLCState::Committed => {
3922                                         1u8.write(writer)?;
3923                                 },
3924                                 &OutboundHTLCState::RemoteRemoved(ref fail_reason) => {
3925                                         2u8.write(writer)?;
3926                                         fail_reason.write(writer)?;
3927                                 },
3928                                 &OutboundHTLCState::AwaitingRemoteRevokeToRemove(ref fail_reason) => {
3929                                         3u8.write(writer)?;
3930                                         fail_reason.write(writer)?;
3931                                 },
3932                                 &OutboundHTLCState::AwaitingRemovedRemoteRevoke(ref fail_reason) => {
3933                                         4u8.write(writer)?;
3934                                         fail_reason.write(writer)?;
3935                                 },
3936                         }
3937                 }
3938
3939                 (self.holding_cell_htlc_updates.len() as u64).write(writer)?;
3940                 for update in self.holding_cell_htlc_updates.iter() {
3941                         match update {
3942                                 &HTLCUpdateAwaitingACK::AddHTLC { ref amount_msat, ref cltv_expiry, ref payment_hash, ref source, ref onion_routing_packet } => {
3943                                         0u8.write(writer)?;
3944                                         amount_msat.write(writer)?;
3945                                         cltv_expiry.write(writer)?;
3946                                         payment_hash.write(writer)?;
3947                                         source.write(writer)?;
3948                                         onion_routing_packet.write(writer)?;
3949                                 },
3950                                 &HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_preimage, ref htlc_id } => {
3951                                         1u8.write(writer)?;
3952                                         payment_preimage.write(writer)?;
3953                                         htlc_id.write(writer)?;
3954                                 },
3955                                 &HTLCUpdateAwaitingACK::FailHTLC { ref htlc_id, ref err_packet } => {
3956                                         2u8.write(writer)?;
3957                                         htlc_id.write(writer)?;
3958                                         err_packet.write(writer)?;
3959                                 }
3960                         }
3961                 }
3962
3963                 match self.resend_order {
3964                         RAACommitmentOrder::CommitmentFirst => 0u8.write(writer)?,
3965                         RAACommitmentOrder::RevokeAndACKFirst => 1u8.write(writer)?,
3966                 }
3967
3968                 self.monitor_pending_funding_locked.write(writer)?;
3969                 self.monitor_pending_revoke_and_ack.write(writer)?;
3970                 self.monitor_pending_commitment_signed.write(writer)?;
3971
3972                 (self.monitor_pending_forwards.len() as u64).write(writer)?;
3973                 for &(ref pending_forward, ref htlc_id) in self.monitor_pending_forwards.iter() {
3974                         pending_forward.write(writer)?;
3975                         htlc_id.write(writer)?;
3976                 }
3977
3978                 (self.monitor_pending_failures.len() as u64).write(writer)?;
3979                 for &(ref htlc_source, ref payment_hash, ref fail_reason) in self.monitor_pending_failures.iter() {
3980                         htlc_source.write(writer)?;
3981                         payment_hash.write(writer)?;
3982                         fail_reason.write(writer)?;
3983                 }
3984
3985                 self.pending_update_fee.write(writer)?;
3986                 self.holding_cell_update_fee.write(writer)?;
3987
3988                 self.next_local_htlc_id.write(writer)?;
3989                 (self.next_remote_htlc_id - dropped_inbound_htlcs).write(writer)?;
3990                 self.update_time_counter.write(writer)?;
3991                 self.feerate_per_kw.write(writer)?;
3992
3993                 match self.last_sent_closing_fee {
3994                         Some((feerate, fee, sig)) => {
3995                                 1u8.write(writer)?;
3996                                 feerate.write(writer)?;
3997                                 fee.write(writer)?;
3998                                 sig.write(writer)?;
3999                         },
4000                         None => 0u8.write(writer)?,
4001                 }
4002
4003                 self.funding_txo.write(writer)?;
4004                 self.funding_tx_confirmed_in.write(writer)?;
4005                 self.short_channel_id.write(writer)?;
4006
4007                 self.last_block_connected.write(writer)?;
4008                 self.funding_tx_confirmations.write(writer)?;
4009
4010                 self.their_dust_limit_satoshis.write(writer)?;
4011                 self.our_dust_limit_satoshis.write(writer)?;
4012                 self.their_max_htlc_value_in_flight_msat.write(writer)?;
4013                 self.their_channel_reserve_satoshis.write(writer)?;
4014                 self.their_htlc_minimum_msat.write(writer)?;
4015                 self.our_htlc_minimum_msat.write(writer)?;
4016                 self.their_to_self_delay.write(writer)?;
4017                 self.our_to_self_delay.write(writer)?;
4018                 self.their_max_accepted_htlcs.write(writer)?;
4019                 self.minimum_depth.write(writer)?;
4020
4021                 self.their_pubkeys.write(writer)?;
4022                 self.their_cur_commitment_point.write(writer)?;
4023
4024                 self.their_prev_commitment_point.write(writer)?;
4025                 self.their_node_id.write(writer)?;
4026
4027                 self.their_shutdown_scriptpubkey.write(writer)?;
4028
4029                 self.commitment_secrets.write(writer)?;
4030
4031                 self.channel_monitor.as_ref().unwrap().write_for_disk(writer)?;
4032                 Ok(())
4033         }
4034 }
4035
4036 impl<ChanSigner: ChannelKeys + Readable> ReadableArgs<Arc<Logger>> for Channel<ChanSigner> {
4037         fn read<R : ::std::io::Read>(reader: &mut R, logger: Arc<Logger>) -> Result<Self, DecodeError> {
4038                 let _ver: u8 = Readable::read(reader)?;
4039                 let min_ver: u8 = Readable::read(reader)?;
4040                 if min_ver > SERIALIZATION_VERSION {
4041                         return Err(DecodeError::UnknownVersion);
4042                 }
4043
4044                 let user_id = Readable::read(reader)?;
4045                 let config: ChannelConfig = Readable::read(reader)?;
4046
4047                 let channel_id = Readable::read(reader)?;
4048                 let channel_state = Readable::read(reader)?;
4049                 let channel_outbound = Readable::read(reader)?;
4050                 let channel_value_satoshis = Readable::read(reader)?;
4051
4052                 let latest_monitor_update_id = Readable::read(reader)?;
4053
4054                 let local_keys = Readable::read(reader)?;
4055                 let shutdown_pubkey = Readable::read(reader)?;
4056                 let destination_script = Readable::read(reader)?;
4057
4058                 let cur_local_commitment_transaction_number = Readable::read(reader)?;
4059                 let cur_remote_commitment_transaction_number = Readable::read(reader)?;
4060                 let value_to_self_msat = Readable::read(reader)?;
4061
4062                 let pending_inbound_htlc_count: u64 = Readable::read(reader)?;
4063                 let mut pending_inbound_htlcs = Vec::with_capacity(cmp::min(pending_inbound_htlc_count as usize, OUR_MAX_HTLCS as usize));
4064                 for _ in 0..pending_inbound_htlc_count {
4065                         pending_inbound_htlcs.push(InboundHTLCOutput {
4066                                 htlc_id: Readable::read(reader)?,
4067                                 amount_msat: Readable::read(reader)?,
4068                                 cltv_expiry: Readable::read(reader)?,
4069                                 payment_hash: Readable::read(reader)?,
4070                                 state: match <u8 as Readable>::read(reader)? {
4071                                         1 => InboundHTLCState::AwaitingRemoteRevokeToAnnounce(Readable::read(reader)?),
4072                                         2 => InboundHTLCState::AwaitingAnnouncedRemoteRevoke(Readable::read(reader)?),
4073                                         3 => InboundHTLCState::Committed,
4074                                         4 => InboundHTLCState::LocalRemoved(Readable::read(reader)?),
4075                                         _ => return Err(DecodeError::InvalidValue),
4076                                 },
4077                         });
4078                 }
4079
4080                 let pending_outbound_htlc_count: u64 = Readable::read(reader)?;
4081                 let mut pending_outbound_htlcs = Vec::with_capacity(cmp::min(pending_outbound_htlc_count as usize, OUR_MAX_HTLCS as usize));
4082                 for _ in 0..pending_outbound_htlc_count {
4083                         pending_outbound_htlcs.push(OutboundHTLCOutput {
4084                                 htlc_id: Readable::read(reader)?,
4085                                 amount_msat: Readable::read(reader)?,
4086                                 cltv_expiry: Readable::read(reader)?,
4087                                 payment_hash: Readable::read(reader)?,
4088                                 source: Readable::read(reader)?,
4089                                 state: match <u8 as Readable>::read(reader)? {
4090                                         0 => OutboundHTLCState::LocalAnnounced(Box::new(Readable::read(reader)?)),
4091                                         1 => OutboundHTLCState::Committed,
4092                                         2 => OutboundHTLCState::RemoteRemoved(Readable::read(reader)?),
4093                                         3 => OutboundHTLCState::AwaitingRemoteRevokeToRemove(Readable::read(reader)?),
4094                                         4 => OutboundHTLCState::AwaitingRemovedRemoteRevoke(Readable::read(reader)?),
4095                                         _ => return Err(DecodeError::InvalidValue),
4096                                 },
4097                         });
4098                 }
4099
4100                 let holding_cell_htlc_update_count: u64 = Readable::read(reader)?;
4101                 let mut holding_cell_htlc_updates = Vec::with_capacity(cmp::min(holding_cell_htlc_update_count as usize, OUR_MAX_HTLCS as usize*2));
4102                 for _ in 0..holding_cell_htlc_update_count {
4103                         holding_cell_htlc_updates.push(match <u8 as Readable>::read(reader)? {
4104                                 0 => HTLCUpdateAwaitingACK::AddHTLC {
4105                                         amount_msat: Readable::read(reader)?,
4106                                         cltv_expiry: Readable::read(reader)?,
4107                                         payment_hash: Readable::read(reader)?,
4108                                         source: Readable::read(reader)?,
4109                                         onion_routing_packet: Readable::read(reader)?,
4110                                 },
4111                                 1 => HTLCUpdateAwaitingACK::ClaimHTLC {
4112                                         payment_preimage: Readable::read(reader)?,
4113                                         htlc_id: Readable::read(reader)?,
4114                                 },
4115                                 2 => HTLCUpdateAwaitingACK::FailHTLC {
4116                                         htlc_id: Readable::read(reader)?,
4117                                         err_packet: Readable::read(reader)?,
4118                                 },
4119                                 _ => return Err(DecodeError::InvalidValue),
4120                         });
4121                 }
4122
4123                 let resend_order = match <u8 as Readable>::read(reader)? {
4124                         0 => RAACommitmentOrder::CommitmentFirst,
4125                         1 => RAACommitmentOrder::RevokeAndACKFirst,
4126                         _ => return Err(DecodeError::InvalidValue),
4127                 };
4128
4129                 let monitor_pending_funding_locked = Readable::read(reader)?;
4130                 let monitor_pending_revoke_and_ack = Readable::read(reader)?;
4131                 let monitor_pending_commitment_signed = Readable::read(reader)?;
4132
4133                 let monitor_pending_forwards_count: u64 = Readable::read(reader)?;
4134                 let mut monitor_pending_forwards = Vec::with_capacity(cmp::min(monitor_pending_forwards_count as usize, OUR_MAX_HTLCS as usize));
4135                 for _ in 0..monitor_pending_forwards_count {
4136                         monitor_pending_forwards.push((Readable::read(reader)?, Readable::read(reader)?));
4137                 }
4138
4139                 let monitor_pending_failures_count: u64 = Readable::read(reader)?;
4140                 let mut monitor_pending_failures = Vec::with_capacity(cmp::min(monitor_pending_failures_count as usize, OUR_MAX_HTLCS as usize));
4141                 for _ in 0..monitor_pending_failures_count {
4142                         monitor_pending_failures.push((Readable::read(reader)?, Readable::read(reader)?, Readable::read(reader)?));
4143                 }
4144
4145                 let pending_update_fee = Readable::read(reader)?;
4146                 let holding_cell_update_fee = Readable::read(reader)?;
4147
4148                 let next_local_htlc_id = Readable::read(reader)?;
4149                 let next_remote_htlc_id = Readable::read(reader)?;
4150                 let update_time_counter = Readable::read(reader)?;
4151                 let feerate_per_kw = Readable::read(reader)?;
4152
4153                 let last_sent_closing_fee = match <u8 as Readable>::read(reader)? {
4154                         0 => None,
4155                         1 => Some((Readable::read(reader)?, Readable::read(reader)?, Readable::read(reader)?)),
4156                         _ => return Err(DecodeError::InvalidValue),
4157                 };
4158
4159                 let funding_txo = Readable::read(reader)?;
4160                 let funding_tx_confirmed_in = Readable::read(reader)?;
4161                 let short_channel_id = Readable::read(reader)?;
4162
4163                 let last_block_connected = Readable::read(reader)?;
4164                 let funding_tx_confirmations = Readable::read(reader)?;
4165
4166                 let their_dust_limit_satoshis = Readable::read(reader)?;
4167                 let our_dust_limit_satoshis = Readable::read(reader)?;
4168                 let their_max_htlc_value_in_flight_msat = Readable::read(reader)?;
4169                 let their_channel_reserve_satoshis = Readable::read(reader)?;
4170                 let their_htlc_minimum_msat = Readable::read(reader)?;
4171                 let our_htlc_minimum_msat = Readable::read(reader)?;
4172                 let their_to_self_delay = Readable::read(reader)?;
4173                 let our_to_self_delay = Readable::read(reader)?;
4174                 let their_max_accepted_htlcs = Readable::read(reader)?;
4175                 let minimum_depth = Readable::read(reader)?;
4176
4177                 let their_pubkeys = Readable::read(reader)?;
4178                 let their_cur_commitment_point = Readable::read(reader)?;
4179
4180                 let their_prev_commitment_point = Readable::read(reader)?;
4181                 let their_node_id = Readable::read(reader)?;
4182
4183                 let their_shutdown_scriptpubkey = Readable::read(reader)?;
4184                 let commitment_secrets = Readable::read(reader)?;
4185
4186                 let (monitor_last_block, channel_monitor) = ReadableArgs::read(reader, logger.clone())?;
4187                 // We drop the ChannelMonitor's last block connected hash cause we don't actually bother
4188                 // doing full block connection operations on the internal ChannelMonitor copies
4189                 if monitor_last_block != last_block_connected {
4190                         return Err(DecodeError::InvalidValue);
4191                 }
4192
4193                 Ok(Channel {
4194                         user_id,
4195
4196                         config,
4197                         channel_id,
4198                         channel_state,
4199                         channel_outbound,
4200                         secp_ctx: Secp256k1::new(),
4201                         channel_value_satoshis,
4202
4203                         latest_monitor_update_id,
4204
4205                         local_keys,
4206                         shutdown_pubkey,
4207                         destination_script,
4208
4209                         cur_local_commitment_transaction_number,
4210                         cur_remote_commitment_transaction_number,
4211                         value_to_self_msat,
4212
4213                         pending_inbound_htlcs,
4214                         pending_outbound_htlcs,
4215                         holding_cell_htlc_updates,
4216
4217                         resend_order,
4218
4219                         monitor_pending_funding_locked,
4220                         monitor_pending_revoke_and_ack,
4221                         monitor_pending_commitment_signed,
4222                         monitor_pending_forwards,
4223                         monitor_pending_failures,
4224
4225                         pending_update_fee,
4226                         holding_cell_update_fee,
4227                         next_local_htlc_id,
4228                         next_remote_htlc_id,
4229                         update_time_counter,
4230                         feerate_per_kw,
4231
4232                         #[cfg(debug_assertions)]
4233                         max_commitment_tx_output_local: ::std::sync::Mutex::new((0, 0)),
4234                         #[cfg(debug_assertions)]
4235                         max_commitment_tx_output_remote: ::std::sync::Mutex::new((0, 0)),
4236
4237                         last_sent_closing_fee,
4238
4239                         funding_txo,
4240                         funding_tx_confirmed_in,
4241                         short_channel_id,
4242                         last_block_connected,
4243                         funding_tx_confirmations,
4244
4245                         their_dust_limit_satoshis,
4246                         our_dust_limit_satoshis,
4247                         their_max_htlc_value_in_flight_msat,
4248                         their_channel_reserve_satoshis,
4249                         their_htlc_minimum_msat,
4250                         our_htlc_minimum_msat,
4251                         their_to_self_delay,
4252                         our_to_self_delay,
4253                         their_max_accepted_htlcs,
4254                         minimum_depth,
4255
4256                         their_pubkeys,
4257                         their_cur_commitment_point,
4258
4259                         their_prev_commitment_point,
4260                         their_node_id,
4261
4262                         their_shutdown_scriptpubkey,
4263
4264                         channel_monitor: Some(channel_monitor),
4265                         commitment_secrets,
4266
4267                         network_sync: UpdateStatus::Fresh,
4268
4269                         logger,
4270                 })
4271         }
4272 }
4273
4274 #[cfg(test)]
4275 mod tests {
4276         use bitcoin::BitcoinHash;
4277         use bitcoin::util::bip143;
4278         use bitcoin::consensus::encode::serialize;
4279         use bitcoin::blockdata::script::{Script, Builder};
4280         use bitcoin::blockdata::transaction::{Transaction, TxOut};
4281         use bitcoin::blockdata::constants::genesis_block;
4282         use bitcoin::blockdata::opcodes;
4283         use bitcoin::network::constants::Network;
4284         use bitcoin_hashes::hex::FromHex;
4285         use hex;
4286         use ln::channelmanager::{HTLCSource, PaymentPreimage, PaymentHash};
4287         use ln::channel::{Channel,ChannelKeys,InboundHTLCOutput,OutboundHTLCOutput,InboundHTLCState,OutboundHTLCState,HTLCOutputInCommitment,TxCreationKeys};
4288         use ln::channel::MAX_FUNDING_SATOSHIS;
4289         use ln::features::InitFeatures;
4290         use ln::msgs::{OptionalField, DataLossProtect};
4291         use ln::chan_utils;
4292         use ln::chan_utils::{LocalCommitmentTransaction, ChannelPublicKeys};
4293         use chain::chaininterface::{FeeEstimator,ConfirmationTarget};
4294         use chain::keysinterface::{InMemoryChannelKeys, KeysInterface};
4295         use chain::transaction::OutPoint;
4296         use util::config::UserConfig;
4297         use util::enforcing_trait_impls::EnforcingChannelKeys;
4298         use util::test_utils;
4299         use util::logger::Logger;
4300         use secp256k1::{Secp256k1, Message, Signature, All};
4301         use secp256k1::key::{SecretKey,PublicKey};
4302         use bitcoin_hashes::sha256::Hash as Sha256;
4303         use bitcoin_hashes::sha256d::Hash as Sha256dHash;
4304         use bitcoin_hashes::hash160::Hash as Hash160;
4305         use bitcoin_hashes::Hash;
4306         use std::sync::Arc;
4307         use rand::{thread_rng,Rng};
4308
4309         struct TestFeeEstimator {
4310                 fee_est: u64
4311         }
4312         impl FeeEstimator for TestFeeEstimator {
4313                 fn get_est_sat_per_1000_weight(&self, _: ConfirmationTarget) -> u64 {
4314                         self.fee_est
4315                 }
4316         }
4317
4318         #[test]
4319         fn test_max_funding_satoshis() {
4320                 assert!(MAX_FUNDING_SATOSHIS <= 21_000_000 * 100_000_000,
4321                         "MAX_FUNDING_SATOSHIS is greater than all satoshis in existence");
4322         }
4323
4324         struct Keys {
4325                 chan_keys: InMemoryChannelKeys,
4326         }
4327         impl KeysInterface for Keys {
4328                 type ChanKeySigner = InMemoryChannelKeys;
4329
4330                 fn get_node_secret(&self) -> SecretKey { panic!(); }
4331                 fn get_destination_script(&self) -> Script {
4332                         let secp_ctx = Secp256k1::signing_only();
4333                         let channel_monitor_claim_key = SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap();
4334                         let our_channel_monitor_claim_key_hash = Hash160::hash(&PublicKey::from_secret_key(&secp_ctx, &channel_monitor_claim_key).serialize());
4335                         Builder::new().push_opcode(opcodes::all::OP_PUSHBYTES_0).push_slice(&our_channel_monitor_claim_key_hash[..]).into_script()
4336                 }
4337
4338                 fn get_shutdown_pubkey(&self) -> PublicKey {
4339                         let secp_ctx = Secp256k1::signing_only();
4340                         let channel_close_key = SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap();
4341                         PublicKey::from_secret_key(&secp_ctx, &channel_close_key)
4342                 }
4343
4344                 fn get_channel_keys(&self, _inbound: bool, _channel_value_satoshis: u64) -> InMemoryChannelKeys {
4345                         self.chan_keys.clone()
4346                 }
4347                 fn get_onion_rand(&self) -> (SecretKey, [u8; 32]) { panic!(); }
4348                 fn get_channel_id(&self) -> [u8; 32] { [0; 32] }
4349         }
4350
4351         fn public_from_secret_hex(secp_ctx: &Secp256k1<All>, hex: &str) -> PublicKey {
4352                 PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode(hex).unwrap()[..]).unwrap())
4353         }
4354
4355         #[test]
4356         fn channel_reestablish_no_updates() {
4357                 let feeest = TestFeeEstimator{fee_est: 15000};
4358                 let logger : Arc<Logger> = Arc::new(test_utils::TestLogger::new());
4359                 let secp_ctx = Secp256k1::new();
4360                 let mut seed = [0; 32];
4361                 let mut rng = thread_rng();
4362                 rng.fill_bytes(&mut seed);
4363                 let network = Network::Testnet;
4364                 let keys_provider = test_utils::TestKeysInterface::new(&seed, network, logger.clone() as Arc<Logger>);
4365
4366                 // Go through the flow of opening a channel between two nodes.
4367
4368                 // Create Node A's channel
4369                 let node_a_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
4370                 let config = UserConfig::default();
4371                 let mut node_a_chan = Channel::<EnforcingChannelKeys>::new_outbound(&&feeest, &&keys_provider, node_a_node_id, 10000000, 100000, 42, Arc::clone(&logger), &config).unwrap();
4372
4373                 // Create Node B's channel by receiving Node A's open_channel message
4374                 let open_channel_msg = node_a_chan.get_open_channel(genesis_block(network).header.bitcoin_hash(), &&feeest);
4375                 let node_b_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[7; 32]).unwrap());
4376                 let mut node_b_chan = Channel::<EnforcingChannelKeys>::new_from_req(&&feeest, &&keys_provider, node_b_node_id, InitFeatures::supported(), &open_channel_msg, 7, logger, &config).unwrap();
4377
4378                 // Node B --> Node A: accept channel
4379                 let accept_channel_msg = node_b_chan.get_accept_channel();
4380                 node_a_chan.accept_channel(&accept_channel_msg, &config, InitFeatures::supported()).unwrap();
4381
4382                 // Node A --> Node B: funding created
4383                 let output_script = node_a_chan.get_funding_redeemscript();
4384                 let tx = Transaction { version: 1, lock_time: 0, input: Vec::new(), output: vec![TxOut {
4385                         value: 10000000, script_pubkey: output_script.clone(),
4386                 }]};
4387                 let funding_outpoint = OutPoint::new(tx.txid(), 0);
4388                 let (funding_created_msg, _) = node_a_chan.get_outbound_funding_created(funding_outpoint).unwrap();
4389                 let (funding_signed_msg, _) = node_b_chan.funding_created(&funding_created_msg).unwrap();
4390
4391                 // Node B --> Node A: funding signed
4392                 let _ = node_a_chan.funding_signed(&funding_signed_msg);
4393
4394                 // Now disconnect the two nodes and check that the commitment point in
4395                 // Node B's channel_reestablish message is sane.
4396                 node_b_chan.remove_uncommitted_htlcs_and_mark_paused();
4397                 let expected_commitment_point = PublicKey::from_secret_key(&secp_ctx, &node_b_chan.build_local_commitment_secret(node_b_chan.cur_local_commitment_transaction_number + 1));
4398                 let msg = node_b_chan.get_channel_reestablish();
4399                 match msg.data_loss_protect {
4400                         OptionalField::Present(DataLossProtect { my_current_per_commitment_point, .. }) => {
4401                                 assert_eq!(expected_commitment_point, my_current_per_commitment_point);
4402                         },
4403                         _ => panic!()
4404                 }
4405
4406                 // Check that the commitment point in Node A's channel_reestablish message
4407                 // is sane.
4408                 node_a_chan.remove_uncommitted_htlcs_and_mark_paused();
4409                 let expected_commitment_point = PublicKey::from_secret_key(&secp_ctx, &node_a_chan.build_local_commitment_secret(node_a_chan.cur_local_commitment_transaction_number + 1));
4410                 let msg = node_a_chan.get_channel_reestablish();
4411                 match msg.data_loss_protect {
4412                         OptionalField::Present(DataLossProtect { my_current_per_commitment_point, .. }) => {
4413                                 assert_eq!(expected_commitment_point, my_current_per_commitment_point);
4414                         },
4415                         _ => panic!()
4416                 }
4417         }
4418
4419         #[test]
4420         fn outbound_commitment_test() {
4421                 // Test vectors from BOLT 3 Appendix C:
4422                 let feeest = TestFeeEstimator{fee_est: 15000};
4423                 let logger : Arc<Logger> = Arc::new(test_utils::TestLogger::new());
4424                 let secp_ctx = Secp256k1::new();
4425
4426                 let mut chan_keys = InMemoryChannelKeys::new(
4427                         &secp_ctx,
4428                         SecretKey::from_slice(&hex::decode("30ff4956bbdd3222d44cc5e8a1261dab1e07957bdac5ae88fe3261ef321f3749").unwrap()[..]).unwrap(),
4429                         SecretKey::from_slice(&hex::decode("0fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff").unwrap()[..]).unwrap(),
4430                         SecretKey::from_slice(&hex::decode("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
4431                         SecretKey::from_slice(&hex::decode("3333333333333333333333333333333333333333333333333333333333333333").unwrap()[..]).unwrap(),
4432                         SecretKey::from_slice(&hex::decode("1111111111111111111111111111111111111111111111111111111111111111").unwrap()[..]).unwrap(),
4433
4434                         // These aren't set in the test vectors:
4435                         [0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff],
4436                         10_000_000,
4437                 );
4438
4439                 assert_eq!(PublicKey::from_secret_key(&secp_ctx, chan_keys.funding_key()).serialize()[..],
4440                                 hex::decode("023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb").unwrap()[..]);
4441                 let keys_provider = Keys { chan_keys: chan_keys.clone() };
4442
4443                 let their_node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&[42; 32]).unwrap());
4444                 let mut config = UserConfig::default();
4445                 config.channel_options.announced_channel = false;
4446                 let mut chan = Channel::<InMemoryChannelKeys>::new_outbound(&&feeest, &&keys_provider, their_node_id, 10_000_000, 100000, 42, Arc::clone(&logger), &config).unwrap(); // Nothing uses their network key in this test
4447                 chan.their_to_self_delay = 144;
4448                 chan.our_dust_limit_satoshis = 546;
4449
4450                 let funding_info = OutPoint::new(Sha256dHash::from_hex("8984484a580b825b9972d7adb15050b3ab624ccd731946b3eeddb92f4e7ef6be").unwrap(), 0);
4451                 chan.funding_txo = Some(funding_info);
4452
4453                 let their_pubkeys = ChannelPublicKeys {
4454                         funding_pubkey: public_from_secret_hex(&secp_ctx, "1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13"),
4455                         revocation_basepoint: PublicKey::from_slice(&hex::decode("02466d7fcae563e5cb09a0d1870bb580344804617879a14949cf22285f1bae3f27").unwrap()[..]).unwrap(),
4456                         payment_basepoint: public_from_secret_hex(&secp_ctx, "4444444444444444444444444444444444444444444444444444444444444444"),
4457                         delayed_payment_basepoint: public_from_secret_hex(&secp_ctx, "1552dfba4f6cf29a62a0af13c8d6981d36d0ef8d61ba10fb0fe90da7634d7e13"),
4458                         htlc_basepoint: public_from_secret_hex(&secp_ctx, "4444444444444444444444444444444444444444444444444444444444444444")
4459                 };
4460                 chan_keys.set_remote_channel_pubkeys(&their_pubkeys);
4461
4462                 assert_eq!(their_pubkeys.payment_basepoint.serialize()[..],
4463                            hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
4464
4465                 assert_eq!(their_pubkeys.funding_pubkey.serialize()[..],
4466                            hex::decode("030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c1").unwrap()[..]);
4467
4468                 assert_eq!(their_pubkeys.htlc_basepoint.serialize()[..],
4469                            hex::decode("032c0b7cf95324a07d05398b240174dc0c2be444d96b159aa6c7f7b1e668680991").unwrap()[..]);
4470
4471                 // We can't just use build_local_transaction_keys here as the per_commitment_secret is not
4472                 // derived from a commitment_seed, so instead we copy it here and call
4473                 // build_commitment_transaction.
4474                 let delayed_payment_base = PublicKey::from_secret_key(&secp_ctx, chan.local_keys.delayed_payment_base_key());
4475                 let per_commitment_secret = SecretKey::from_slice(&hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
4476                 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
4477                 let htlc_basepoint = PublicKey::from_secret_key(&secp_ctx, chan.local_keys.htlc_base_key());
4478                 let keys = TxCreationKeys::new(&secp_ctx, &per_commitment_point, &delayed_payment_base, &htlc_basepoint, &their_pubkeys.revocation_basepoint, &their_pubkeys.payment_basepoint, &their_pubkeys.htlc_basepoint).unwrap();
4479
4480                 chan.their_pubkeys = Some(their_pubkeys);
4481
4482                 let mut unsigned_tx: (Transaction, Vec<HTLCOutputInCommitment>);
4483
4484                 let mut localtx;
4485                 macro_rules! test_commitment {
4486                         ( $their_sig_hex: expr, $our_sig_hex: expr, $tx_hex: expr, {
4487                                 $( { $htlc_idx: expr, $their_htlc_sig_hex: expr, $our_htlc_sig_hex: expr, $htlc_tx_hex: expr } ), *
4488                         } ) => {
4489                                 unsigned_tx = {
4490                                         let mut res = chan.build_commitment_transaction(0xffffffffffff - 42, &keys, true, false, chan.feerate_per_kw);
4491                                         let htlcs = res.2.drain(..)
4492                                                 .filter_map(|(htlc, _)| if htlc.transaction_output_index.is_some() { Some(htlc) } else { None })
4493                                                 .collect();
4494                                         (res.0, htlcs)
4495                                 };
4496                                 let redeemscript = chan.get_funding_redeemscript();
4497                                 let their_signature = Signature::from_der(&hex::decode($their_sig_hex).unwrap()[..]).unwrap();
4498                                 let sighash = Message::from_slice(&bip143::SighashComponents::new(&unsigned_tx.0).sighash_all(&unsigned_tx.0.input[0], &redeemscript, chan.channel_value_satoshis)[..]).unwrap();
4499                                 secp_ctx.verify(&sighash, &their_signature, chan.their_funding_pubkey()).unwrap();
4500
4501                                 let mut per_htlc = Vec::new();
4502                                 per_htlc.clear(); // Don't warn about excess mut for no-HTLC calls
4503                                 $({
4504                                         let remote_signature = Signature::from_der(&hex::decode($their_htlc_sig_hex).unwrap()[..]).unwrap();
4505                                         per_htlc.push((unsigned_tx.1[$htlc_idx].clone(), Some(remote_signature)));
4506                                 })*
4507                                 assert_eq!(unsigned_tx.1.len(), per_htlc.len());
4508
4509                                 localtx = LocalCommitmentTransaction::new_missing_local_sig(unsigned_tx.0.clone(), &their_signature, &PublicKey::from_secret_key(&secp_ctx, chan.local_keys.funding_key()), chan.their_funding_pubkey(), keys.clone(), chan.feerate_per_kw, per_htlc);
4510                                 chan_keys.sign_local_commitment(&mut localtx, &chan.secp_ctx);
4511
4512                                 assert_eq!(serialize(localtx.with_valid_witness())[..],
4513                                                 hex::decode($tx_hex).unwrap()[..]);
4514
4515                                 $({
4516                                         let remote_signature = Signature::from_der(&hex::decode($their_htlc_sig_hex).unwrap()[..]).unwrap();
4517
4518                                         let ref htlc = unsigned_tx.1[$htlc_idx];
4519                                         let htlc_tx = chan.build_htlc_transaction(&unsigned_tx.0.txid(), &htlc, true, &keys, chan.feerate_per_kw);
4520                                         let htlc_redeemscript = chan_utils::get_htlc_redeemscript(&htlc, &keys);
4521                                         let htlc_sighash = Message::from_slice(&bip143::SighashComponents::new(&htlc_tx).sighash_all(&htlc_tx.input[0], &htlc_redeemscript, htlc.amount_msat / 1000)[..]).unwrap();
4522                                         secp_ctx.verify(&htlc_sighash, &remote_signature, &keys.b_htlc_key).unwrap();
4523
4524                                         let mut preimage: Option<PaymentPreimage> = None;
4525                                         if !htlc.offered {
4526                                                 for i in 0..5 {
4527                                                         let out = PaymentHash(Sha256::hash(&[i; 32]).into_inner());
4528                                                         if out == htlc.payment_hash {
4529                                                                 preimage = Some(PaymentPreimage([i; 32]));
4530                                                         }
4531                                                 }
4532
4533                                                 assert!(preimage.is_some());
4534                                         }
4535
4536                                         chan_keys.sign_htlc_transaction(&mut localtx, $htlc_idx, preimage, chan.their_to_self_delay, &chan.secp_ctx);
4537
4538                                         assert_eq!(serialize(localtx.htlc_with_valid_witness($htlc_idx).as_ref().unwrap())[..],
4539                                                         hex::decode($htlc_tx_hex).unwrap()[..]);
4540                                 })*
4541                         }
4542                 }
4543
4544                 {
4545                         // simple commitment tx with no HTLCs
4546                         chan.value_to_self_msat = 7000000000;
4547
4548                         test_commitment!("3045022100f51d2e566a70ba740fc5d8c0f07b9b93d2ed741c3c0860c613173de7d39e7968022041376d520e9c0e1ad52248ddf4b22e12be8763007df977253ef45a4ca3bdb7c0",
4549                                          "3044022051b75c73198c6deee1a875871c3961832909acd297c6b908d59e3319e5185a46022055c419379c5051a78d00dbbce11b5b664a0c22815fbcc6fcef6b1937c3836939",
4550                                          "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", {});
4551                 }
4552
4553                 chan.pending_inbound_htlcs.push({
4554                         let mut out = InboundHTLCOutput{
4555                                 htlc_id: 0,
4556                                 amount_msat: 1000000,
4557                                 cltv_expiry: 500,
4558                                 payment_hash: PaymentHash([0; 32]),
4559                                 state: InboundHTLCState::Committed,
4560                         };
4561                         out.payment_hash.0 = Sha256::hash(&hex::decode("0000000000000000000000000000000000000000000000000000000000000000").unwrap()).into_inner();
4562                         out
4563                 });
4564                 chan.pending_inbound_htlcs.push({
4565                         let mut out = InboundHTLCOutput{
4566                                 htlc_id: 1,
4567                                 amount_msat: 2000000,
4568                                 cltv_expiry: 501,
4569                                 payment_hash: PaymentHash([0; 32]),
4570                                 state: InboundHTLCState::Committed,
4571                         };
4572                         out.payment_hash.0 = Sha256::hash(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()).into_inner();
4573                         out
4574                 });
4575                 chan.pending_outbound_htlcs.push({
4576                         let mut out = OutboundHTLCOutput{
4577                                 htlc_id: 2,
4578                                 amount_msat: 2000000,
4579                                 cltv_expiry: 502,
4580                                 payment_hash: PaymentHash([0; 32]),
4581                                 state: OutboundHTLCState::Committed,
4582                                 source: HTLCSource::dummy(),
4583                         };
4584                         out.payment_hash.0 = Sha256::hash(&hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap()).into_inner();
4585                         out
4586                 });
4587                 chan.pending_outbound_htlcs.push({
4588                         let mut out = OutboundHTLCOutput{
4589                                 htlc_id: 3,
4590                                 amount_msat: 3000000,
4591                                 cltv_expiry: 503,
4592                                 payment_hash: PaymentHash([0; 32]),
4593                                 state: OutboundHTLCState::Committed,
4594                                 source: HTLCSource::dummy(),
4595                         };
4596                         out.payment_hash.0 = Sha256::hash(&hex::decode("0303030303030303030303030303030303030303030303030303030303030303").unwrap()).into_inner();
4597                         out
4598                 });
4599                 chan.pending_inbound_htlcs.push({
4600                         let mut out = InboundHTLCOutput{
4601                                 htlc_id: 4,
4602                                 amount_msat: 4000000,
4603                                 cltv_expiry: 504,
4604                                 payment_hash: PaymentHash([0; 32]),
4605                                 state: InboundHTLCState::Committed,
4606                         };
4607                         out.payment_hash.0 = Sha256::hash(&hex::decode("0404040404040404040404040404040404040404040404040404040404040404").unwrap()).into_inner();
4608                         out
4609                 });
4610
4611                 // commitment tx with all five HTLCs untrimmed (minimum feerate)
4612                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4613                 chan.feerate_per_kw = 0;
4614
4615                 test_commitment!("304402204fd4928835db1ccdfc40f5c78ce9bd65249b16348df81f0c44328dcdefc97d630220194d3869c38bc732dd87d13d2958015e2fc16829e74cd4377f84d215c0b70606",
4616                                  "30440220275b0c325a5e9355650dc30c0eccfbc7efb23987c24b556b9dfdd40effca18d202206caceb2c067836c51f296740c7ae807ffcbfbf1dd3a0d56b6de9a5b247985f06",
4617                                  "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", {
4618
4619                                   { 0,
4620                                   "304402206a6e59f18764a5bf8d4fa45eebc591566689441229c918b480fb2af8cc6a4aeb02205248f273be447684b33e3c8d1d85a8e0ca9fa0bae9ae33f0527ada9c162919a6",
4621                                   "304402207cb324fa0de88f452ffa9389678127ebcf4cabe1dd848b8e076c1a1962bf34720220116ed922b12311bd602d67e60d2529917f21c5b82f25ff6506c0f87886b4dfd5",
4622                                   "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"},
4623
4624                                   { 1,
4625                                   "3045022100d5275b3619953cb0c3b5aa577f04bc512380e60fa551762ce3d7a1bb7401cff9022037237ab0dac3fe100cde094e82e2bed9ba0ed1bb40154b48e56aa70f259e608b",
4626                                   "3045022100c89172099507ff50f4c925e6c5150e871fb6e83dd73ff9fbb72f6ce829a9633f02203a63821d9162e99f9be712a68f9e589483994feae2661e4546cd5b6cec007be5",
4627                                   "020000000001018154ecccf11a5fb56c39654c4deb4d2296f83c69268280b94d021370c94e219701000000000000000001d0070000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100d5275b3619953cb0c3b5aa577f04bc512380e60fa551762ce3d7a1bb7401cff9022037237ab0dac3fe100cde094e82e2bed9ba0ed1bb40154b48e56aa70f259e608b01483045022100c89172099507ff50f4c925e6c5150e871fb6e83dd73ff9fbb72f6ce829a9633f02203a63821d9162e99f9be712a68f9e589483994feae2661e4546cd5b6cec007be501008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a914b43e1b38138a41b37f7cd9a1d274bc63e3a9b5d188ac6868f6010000"},
4628
4629                                   { 2,
4630                                   "304402201b63ec807771baf4fdff523c644080de17f1da478989308ad13a58b51db91d360220568939d38c9ce295adba15665fa68f51d967e8ed14a007b751540a80b325f202",
4631                                   "3045022100def389deab09cee69eaa1ec14d9428770e45bcbe9feb46468ecf481371165c2f022015d2e3c46600b2ebba8dcc899768874cc6851fd1ecb3fffd15db1cc3de7e10da",
4632                                   "020000000001018154ecccf11a5fb56c39654c4deb4d2296f83c69268280b94d021370c94e219702000000000000000001d0070000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e050047304402201b63ec807771baf4fdff523c644080de17f1da478989308ad13a58b51db91d360220568939d38c9ce295adba15665fa68f51d967e8ed14a007b751540a80b325f20201483045022100def389deab09cee69eaa1ec14d9428770e45bcbe9feb46468ecf481371165c2f022015d2e3c46600b2ebba8dcc899768874cc6851fd1ecb3fffd15db1cc3de7e10da012001010101010101010101010101010101010101010101010101010101010101018a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a9144b6b2e5444c2639cc0fb7bcea5afba3f3cdce23988527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f501b175ac686800000000"},
4633
4634                                   { 3,
4635                                   "3045022100daee1808f9861b6c3ecd14f7b707eca02dd6bdfc714ba2f33bc8cdba507bb182022026654bf8863af77d74f51f4e0b62d461a019561bb12acb120d3f7195d148a554",
4636                                   "30440220643aacb19bbb72bd2b635bc3f7375481f5981bace78cdd8319b2988ffcc6704202203d27784ec8ad51ed3bd517a05525a5139bb0b755dd719e0054332d186ac08727",
4637                                   "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"},
4638
4639                                  { 4,
4640                                   "304402207e0410e45454b0978a623f36a10626ef17b27d9ad44e2760f98cfa3efb37924f0220220bd8acd43ecaa916a80bd4f919c495a2c58982ce7c8625153f8596692a801d",
4641                                   "30440220549e80b4496803cbc4a1d09d46df50109f546d43fbbf86cd90b174b1484acd5402205f12a4f995cb9bded597eabfee195a285986aa6d93ae5bb72507ebc6a4e2349e",
4642                                   "020000000001018154ecccf11a5fb56c39654c4deb4d2296f83c69268280b94d021370c94e219704000000000000000001a00f0000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e050047304402207e0410e45454b0978a623f36a10626ef17b27d9ad44e2760f98cfa3efb37924f0220220bd8acd43ecaa916a80bd4f919c495a2c58982ce7c8625153f8596692a801d014730440220549e80b4496803cbc4a1d09d46df50109f546d43fbbf86cd90b174b1484acd5402205f12a4f995cb9bded597eabfee195a285986aa6d93ae5bb72507ebc6a4e2349e012004040404040404040404040404040404040404040404040404040404040404048a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a91418bc1a114ccf9c052d3d23e28d3b0a9d1227434288527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f801b175ac686800000000"}
4643                 } );
4644
4645                 // commitment tx with seven outputs untrimmed (maximum feerate)
4646                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4647                 chan.feerate_per_kw = 647;
4648
4649                 test_commitment!("3045022100a5c01383d3ec646d97e40f44318d49def817fcd61a0ef18008a665b3e151785502203e648efddd5838981ef55ec954be69c4a652d021e6081a100d034de366815e9b",
4650                                  "304502210094bfd8f5572ac0157ec76a9551b6c5216a4538c07cd13a51af4a54cb26fa14320220768efce8ce6f4a5efac875142ff19237c011343670adf9c7ac69704a120d1163",
4651                                  "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", {
4652
4653                                  { 0,
4654                                   "30440220385a5afe75632f50128cbb029ee95c80156b5b4744beddc729ad339c9ca432c802202ba5f48550cad3379ac75b9b4fedb86a35baa6947f16ba5037fb8b11ab343740",
4655                                   "304402205999590b8a79fa346e003a68fd40366397119b2b0cdf37b149968d6bc6fbcc4702202b1e1fb5ab7864931caed4e732c359e0fe3d86a548b557be2246efb1708d579a",
4656                                   "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"},
4657
4658                                  { 1,
4659                                   "304402207ceb6678d4db33d2401fdc409959e57c16a6cb97a30261d9c61f29b8c58d34b90220084b4a17b4ca0e86f2d798b3698ca52de5621f2ce86f80bed79afa66874511b0",
4660                                   "304402207ff03eb0127fc7c6cae49cc29e2a586b98d1e8969cf4a17dfa50b9c2647720b902205e2ecfda2252956c0ca32f175080e75e4e390e433feb1f8ce9f2ba55648a1dac",
4661                                   "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"},
4662
4663                                  { 2,
4664                                   "304402206a401b29a0dff0d18ec903502c13d83e7ec019450113f4a7655a4ce40d1f65ba0220217723a084e727b6ca0cc8b6c69c014a7e4a01fcdcba3e3993f462a3c574d833",
4665                                   "3045022100d50d067ca625d54e62df533a8f9291736678d0b86c28a61bb2a80cf42e702d6e02202373dde7e00218eacdafb9415fe0e1071beec1857d1af3c6a201a44cbc47c877",
4666                                   "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"},
4667
4668                                  { 3,
4669                                   "30450221009b1c987ba599ee3bde1dbca776b85481d70a78b681a8d84206723e2795c7cac002207aac84ad910f8598c4d1c0ea2e3399cf6627a4e3e90131315bc9f038451ce39d",
4670                                   "3045022100db9dc65291077a52728c622987e9895b7241d4394d6dcb916d7600a3e8728c22022036ee3ee717ba0bb5c45ee84bc7bbf85c0f90f26ae4e4a25a6b4241afa8a3f1cb",
4671                                   "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"},
4672
4673                                  { 4,
4674                                   "3045022100cc28030b59f0914f45b84caa983b6f8effa900c952310708c2b5b00781117022022027ba2ccdf94d03c6d48b327f183f6e28c8a214d089b9227f94ac4f85315274f0",
4675                                   "304402202d1a3c0d31200265d2a2def2753ead4959ae20b4083e19553acfffa5dfab60bf022020ede134149504e15b88ab261a066de49848411e15e70f9e6a5462aec2949f8f",
4676                                   "020000000001018323148ce2419f21ca3d6780053747715832e18ac780931a514b187768882bb604000000000000000001da0d0000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100cc28030b59f0914f45b84caa983b6f8effa900c952310708c2b5b00781117022022027ba2ccdf94d03c6d48b327f183f6e28c8a214d089b9227f94ac4f85315274f00147304402202d1a3c0d31200265d2a2def2753ead4959ae20b4083e19553acfffa5dfab60bf022020ede134149504e15b88ab261a066de49848411e15e70f9e6a5462aec2949f8f012004040404040404040404040404040404040404040404040404040404040404048a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a91418bc1a114ccf9c052d3d23e28d3b0a9d1227434288527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f801b175ac686800000000"}
4677                 });
4678
4679                 // commitment tx with six outputs untrimmed (minimum feerate)
4680                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4681                 chan.feerate_per_kw = 648;
4682
4683                 test_commitment!("3044022072714e2fbb93cdd1c42eb0828b4f2eff143f717d8f26e79d6ada4f0dcb681bbe02200911be4e5161dd6ebe59ff1c58e1997c4aea804f81db6b698821db6093d7b057",
4684                                  "3045022100a2270d5950c89ae0841233f6efea9c951898b301b2e89e0adbd2c687b9f32efa02207943d90f95b9610458e7c65a576e149750ff3accaacad004cd85e70b235e27de",
4685                                  "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", {
4686
4687                                  { 0,
4688                                   "3044022062ef2e77591409d60d7817d9bb1e71d3c4a2931d1a6c7c8307422c84f001a251022022dad9726b0ae3fe92bda745a06f2c00f92342a186d84518588cf65f4dfaada8",
4689                                   "3045022100a4c574f00411dd2f978ca5cdc1b848c311cd7849c087ad2f21a5bce5e8cc5ae90220090ae39a9bce2fb8bc879d7e9f9022df249f41e25e51f1a9bf6447a9eeffc098",
4690                                   "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"},
4691
4692                                  { 1,
4693                                   "3045022100e968cbbb5f402ed389fdc7f6cd2a80ed650bb42c79aeb2a5678444af94f6c78502204b47a1cb24ab5b0b6fe69fe9cfc7dba07b9dd0d8b95f372c1d9435146a88f8d4",
4694                                   "304402207679cf19790bea76a733d2fa0672bd43ab455687a068f815a3d237581f57139a0220683a1a799e102071c206b207735ca80f627ab83d6616b4bcd017c5d79ef3e7d0",
4695                                   "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"},
4696
4697                                  { 2,
4698                                   "3045022100aa91932e305292cf9969cc23502bbf6cef83a5df39c95ad04a707c4f4fed5c7702207099fc0f3a9bfe1e7683c0e9aa5e76c5432eb20693bf4cb182f04d383dc9c8c2",
4699                                   "304402200df76fea718745f3c529bac7fd37923e7309ce38b25c0781e4cf514dd9ef8dc802204172295739dbae9fe0474dcee3608e3433b4b2af3a2e6787108b02f894dcdda3",
4700                                   "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"},
4701
4702                                  { 3,
4703                                   "3044022035cac88040a5bba420b1c4257235d5015309113460bc33f2853cd81ca36e632402202fc94fd3e81e9d34a9d01782a0284f3044370d03d60f3fc041e2da088d2de58f",
4704                                   "304402200daf2eb7afd355b4caf6fb08387b5f031940ea29d1a9f35071288a839c9039e4022067201b562456e7948616c13acb876b386b511599b58ac1d94d127f91c50463a6",
4705                                   "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"}
4706                 });
4707
4708                 // commitment tx with six outputs untrimmed (maximum feerate)
4709                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4710                 chan.feerate_per_kw = 2069;
4711
4712                 test_commitment!("3044022001d55e488b8b035b2dd29d50b65b530923a416d47f377284145bc8767b1b6a75022019bb53ddfe1cefaf156f924777eaaf8fdca1810695a7d0a247ad2afba8232eb4",
4713                                  "304402203ca8f31c6a47519f83255dc69f1894d9a6d7476a19f498d31eaf0cd3a85eeb63022026fd92dc752b33905c4c838c528b692a8ad4ced959990b5d5ee2ff940fa90eea",
4714                                  "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", {
4715
4716                                  { 0,
4717                                   "3045022100d1cf354de41c1369336cf85b225ed033f1f8982a01be503668df756a7e668b66022001254144fb4d0eecc61908fccc3388891ba17c5d7a1a8c62bdd307e5a513f992",
4718                                   "3044022056eb1af429660e45a1b0b66568cb8c4a3aa7e4c9c292d5d6c47f86ebf2c8838f022065c3ac4ebe980ca7a41148569be4ad8751b0a724a41405697ec55035dae66402",
4719                                   "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"},
4720
4721                                  { 1,
4722                                   "3045022100d065569dcb94f090345402736385efeb8ea265131804beac06dd84d15dd2d6880220664feb0b4b2eb985fadb6ec7dc58c9334ea88ce599a9be760554a2d4b3b5d9f4",
4723                                   "3045022100914bb232cd4b2690ee3d6cb8c3713c4ac9c4fb925323068d8b07f67c8541f8d9022057152f5f1615b793d2d45aac7518989ae4fe970f28b9b5c77504799d25433f7f",
4724                                   "02000000000101ca94a9ad516ebc0c4bdd7b6254871babfa978d5accafb554214137d398bfcf6a0100000000000000000122020000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100d065569dcb94f090345402736385efeb8ea265131804beac06dd84d15dd2d6880220664feb0b4b2eb985fadb6ec7dc58c9334ea88ce599a9be760554a2d4b3b5d9f401483045022100914bb232cd4b2690ee3d6cb8c3713c4ac9c4fb925323068d8b07f67c8541f8d9022057152f5f1615b793d2d45aac7518989ae4fe970f28b9b5c77504799d25433f7f012001010101010101010101010101010101010101010101010101010101010101018a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a9144b6b2e5444c2639cc0fb7bcea5afba3f3cdce23988527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f501b175ac686800000000"},
4725
4726                                  { 2,
4727                                   "3045022100d4e69d363de993684eae7b37853c40722a4c1b4a7b588ad7b5d8a9b5006137a102207a069c628170ee34be5612747051bdcc087466dbaa68d5756ea81c10155aef18",
4728                                   "304402200e362443f7af830b419771e8e1614fc391db3a4eb799989abfc5ab26d6fcd032022039ab0cad1c14dfbe9446bf847965e56fe016e0cbcf719fd18c1bfbf53ecbd9f9",
4729                                   "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"},
4730
4731                                  { 3,
4732                                   "30450221008ec888e36e4a4b3dc2ed6b823319855b2ae03006ca6ae0d9aa7e24bfc1d6f07102203b0f78885472a67ff4fe5916c0bb669487d659527509516fc3a08e87a2cc0a7c",
4733                                   "304402202c3e14282b84b02705dfd00a6da396c9fe8a8bcb1d3fdb4b20a4feba09440e8b02202b058b39aa9b0c865b22095edcd9ff1f71bbfe20aa4993755e54d042755ed0d5",
4734                                   "02000000000101ca94a9ad516ebc0c4bdd7b6254871babfa978d5accafb554214137d398bfcf6a03000000000000000001f2090000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e05004830450221008ec888e36e4a4b3dc2ed6b823319855b2ae03006ca6ae0d9aa7e24bfc1d6f07102203b0f78885472a67ff4fe5916c0bb669487d659527509516fc3a08e87a2cc0a7c0147304402202c3e14282b84b02705dfd00a6da396c9fe8a8bcb1d3fdb4b20a4feba09440e8b02202b058b39aa9b0c865b22095edcd9ff1f71bbfe20aa4993755e54d042755ed0d5012004040404040404040404040404040404040404040404040404040404040404048a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a91418bc1a114ccf9c052d3d23e28d3b0a9d1227434288527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f801b175ac686800000000" }
4735                 });
4736
4737                 // commitment tx with five outputs untrimmed (minimum feerate)
4738                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4739                 chan.feerate_per_kw = 2070;
4740
4741                 test_commitment!("3045022100f2377f7a67b7fc7f4e2c0c9e3a7de935c32417f5668eda31ea1db401b7dc53030220415fdbc8e91d0f735e70c21952342742e25249b0d062d43efbfc564499f37526",
4742                                  "30440220443cb07f650aebbba14b8bc8d81e096712590f524c5991ac0ed3bbc8fd3bd0c7022028a635f548e3ca64b19b69b1ea00f05b22752f91daf0b6dab78e62ba52eb7fd0",
4743                                  "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", {
4744
4745                                  { 0,
4746                                   "3045022100eed143b1ee4bed5dc3cde40afa5db3e7354cbf9c44054b5f713f729356f08cf7022077161d171c2bbd9badf3c9934de65a4918de03bbac1450f715275f75b103f891",
4747                                   "3045022100a0d043ed533e7fb1911e0553d31a8e2f3e6de19dbc035257f29d747c5e02f1f5022030cd38d8e84282175d49c1ebe0470db3ebd59768cf40780a784e248a43904fb8",
4748                                   "0200000000010140a83ce364747ff277f4d7595d8d15f708418798922c40bc2b056aca5485a2180000000000000000000174020000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100eed143b1ee4bed5dc3cde40afa5db3e7354cbf9c44054b5f713f729356f08cf7022077161d171c2bbd9badf3c9934de65a4918de03bbac1450f715275f75b103f89101483045022100a0d043ed533e7fb1911e0553d31a8e2f3e6de19dbc035257f29d747c5e02f1f5022030cd38d8e84282175d49c1ebe0470db3ebd59768cf40780a784e248a43904fb801008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a914b43e1b38138a41b37f7cd9a1d274bc63e3a9b5d188ac6868f6010000"},
4749
4750                                  { 1,
4751                                   "3044022071e9357619fd8d29a411dc053b326a5224c5d11268070e88ecb981b174747c7a02202b763ae29a9d0732fa8836dd8597439460b50472183f420021b768981b4f7cf6",
4752                                   "3045022100adb1d679f65f96178b59f23ed37d3b70443118f345224a07ecb043eee2acc157022034d24524fe857144a3bcfff3065a9994d0a6ec5f11c681e49431d573e242612d",
4753                                   "0200000000010140a83ce364747ff277f4d7595d8d15f708418798922c40bc2b056aca5485a218010000000000000000015c060000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500473044022071e9357619fd8d29a411dc053b326a5224c5d11268070e88ecb981b174747c7a02202b763ae29a9d0732fa8836dd8597439460b50472183f420021b768981b4f7cf601483045022100adb1d679f65f96178b59f23ed37d3b70443118f345224a07ecb043eee2acc157022034d24524fe857144a3bcfff3065a9994d0a6ec5f11c681e49431d573e242612d01008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a9148a486ff2e31d6158bf39e2608864d63fefd09d5b88ac6868f7010000"},
4754
4755                                  { 2,
4756                                   "3045022100c9458a4d2cbb741705577deb0a890e5cb90ee141be0400d3162e533727c9cb2102206edcf765c5dc5e5f9b976ea8149bf8607b5a0efb30691138e1231302b640d2a4",
4757                                   "304402200831422aa4e1ee6d55e0b894201770a8f8817a189356f2d70be76633ffa6a6f602200dd1b84a4855dc6727dd46c98daae43dfc70889d1ba7ef0087529a57c06e5e04",
4758                                   "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"}
4759                 });
4760
4761                 // commitment tx with five outputs untrimmed (maximum feerate)
4762                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4763                 chan.feerate_per_kw = 2194;
4764
4765                 test_commitment!("3045022100d33c4e541aa1d255d41ea9a3b443b3b822ad8f7f86862638aac1f69f8f760577022007e2a18e6931ce3d3a804b1c78eda1de17dbe1fb7a95488c9a4ec86203953348",
4766                                  "304402203b1b010c109c2ecbe7feb2d259b9c4126bd5dc99ee693c422ec0a5781fe161ba0220571fe4e2c649dea9c7aaf7e49b382962f6a3494963c97d80fef9a430ca3f7061",
4767                                  "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", {
4768
4769                                  { 0,
4770                                   "30450221009ed2f0a67f99e29c3c8cf45c08207b765980697781bb727fe0b1416de0e7622902206052684229bc171419ed290f4b615c943f819c0262414e43c5b91dcf72ddcf44",
4771                                   "3044022004ad5f04ae69c71b3b141d4db9d0d4c38d84009fb3cfeeae6efdad414487a9a0022042d3fe1388c1ff517d1da7fb4025663d372c14728ed52dc88608363450ff6a2f",
4772                                   "02000000000101fb824d4e4dafc0f567789dee3a6bce8d411fe80f5563d8cdfdcc7d7e4447d43a0000000000000000000122020000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e05004830450221009ed2f0a67f99e29c3c8cf45c08207b765980697781bb727fe0b1416de0e7622902206052684229bc171419ed290f4b615c943f819c0262414e43c5b91dcf72ddcf4401473044022004ad5f04ae69c71b3b141d4db9d0d4c38d84009fb3cfeeae6efdad414487a9a0022042d3fe1388c1ff517d1da7fb4025663d372c14728ed52dc88608363450ff6a2f01008576a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c820120876475527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae67a914b43e1b38138a41b37f7cd9a1d274bc63e3a9b5d188ac6868f6010000"},
4773
4774                                  { 1,
4775                                   "30440220155d3b90c67c33a8321996a9be5b82431b0c126613be751d400669da9d5c696702204318448bcd48824439d2c6a70be6e5747446be47ff45977cf41672bdc9b6b12d",
4776                                   "304402201707050c870c1f77cc3ed58d6d71bf281de239e9eabd8ef0955bad0d7fe38dcc02204d36d80d0019b3a71e646a08fa4a5607761d341ae8be371946ebe437c289c915",
4777                                   "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"},
4778
4779                                  { 2,
4780                                   "3045022100a12a9a473ece548584aabdd051779025a5ed4077c4b7aa376ec7a0b1645e5a48022039490b333f53b5b3e2ddde1d809e492cba2b3e5fc3a436cd3ffb4cd3d500fa5a",
4781                                   "3045022100ff200bc934ab26ce9a559e998ceb0aee53bc40368e114ab9d3054d9960546e2802202496856ca163ac12c143110b6b3ac9d598df7254f2e17b3b94c3ab5301f4c3b0",
4782                                   "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"}
4783                 });
4784
4785                 // commitment tx with four outputs untrimmed (minimum feerate)
4786                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4787                 chan.feerate_per_kw = 2195;
4788
4789                 test_commitment!("304402205e2f76d4657fb732c0dfc820a18a7301e368f5799e06b7828007633741bda6df0220458009ae59d0c6246065c419359e05eb2a4b4ef4a1b310cc912db44eb7924298",
4790                                  "304402203b12d44254244b8ff3bb4129b0920fd45120ab42f553d9976394b099d500c99e02205e95bb7a3164852ef0c48f9e0eaf145218f8e2c41251b231f03cbdc4f29a5429",
4791                                  "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", {
4792
4793                                  { 0,
4794                                   "3045022100a8a78fa1016a5c5c3704f2e8908715a3cef66723fb95f3132ec4d2d05cd84fb4022025ac49287b0861ec21932405f5600cbce94313dbde0e6c5d5af1b3366d8afbfc",
4795                                   "3045022100be6ae1977fd7b630a53623f3f25c542317ccfc2b971782802a4f1ef538eb22b402207edc4d0408f8f38fd3c7365d1cfc26511b7cd2d4fecd8b005fba3cd5bc704390",
4796                                   "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"},
4797
4798                                  { 1,
4799                                   "3045022100e769cb156aa2f7515d126cef7a69968629620ce82afcaa9e210969de6850df4602200b16b3f3486a229a48aadde520dbee31ae340dbadaffae74fbb56681fef27b92",
4800                                   "30440220665b9cb4a978c09d1ca8977a534999bc8a49da624d0c5439451dd69cde1a003d022070eae0620f01f3c1bd029cc1488da13fb40fdab76f396ccd335479a11c5276d8",
4801                                   "020000000001014e16c488fa158431c1a82e8f661240ec0a71ba0ce92f2721a6538c510226ad5c0100000000000000000199090000000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0500483045022100e769cb156aa2f7515d126cef7a69968629620ce82afcaa9e210969de6850df4602200b16b3f3486a229a48aadde520dbee31ae340dbadaffae74fbb56681fef27b92014730440220665b9cb4a978c09d1ca8977a534999bc8a49da624d0c5439451dd69cde1a003d022070eae0620f01f3c1bd029cc1488da13fb40fdab76f396ccd335479a11c5276d8012004040404040404040404040404040404040404040404040404040404040404048a76a91414011f7254d96b819c76986c277d115efce6f7b58763ac67210394854aa6eab5b2a8122cc726e9dded053a2184d88256816826d6231c068d4a5b7c8201208763a91418bc1a114ccf9c052d3d23e28d3b0a9d1227434288527c21030d417a46946384f88d5f3337267c5e579765875dc4daca813e21734b140639e752ae677502f801b175ac686800000000"}
4802                 });
4803
4804                 // commitment tx with four outputs untrimmed (maximum feerate)
4805                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4806                 chan.feerate_per_kw = 3702;
4807
4808                 test_commitment!("3045022100c1a3b0b60ca092ed5080121f26a74a20cec6bdee3f8e47bae973fcdceb3eda5502207d467a9873c939bf3aa758014ae67295fedbca52412633f7e5b2670fc7c381c1",
4809                                  "304402200e930a43c7951162dc15a2b7344f48091c74c70f7024e7116e900d8bcfba861c022066fa6cbda3929e21daa2e7e16a4b948db7e8919ef978402360d1095ffdaff7b0",
4810                                  "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", {
4811
4812                                  { 0,
4813                                   "3045022100dfb73b4fe961b31a859b2bb1f4f15cabab9265016dd0272323dc6a9e85885c54022059a7b87c02861ee70662907f25ce11597d7b68d3399443a831ae40e777b76bdb",
4814                                   "304402202765b9c9ece4f127fa5407faf66da4c5ce2719cdbe47cd3175fc7d48b482e43d02205605125925e07bad1e41c618a4b434d72c88a164981c4b8af5eaf4ee9142ec3a",
4815                                   "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"},
4816
4817                                  { 1,
4818                                   "3045022100ea9dc2a7c3c3640334dab733bb4e036e32a3106dc707b24227874fa4f7da746802204d672f7ac0fe765931a8df10b81e53a3242dd32bd9dc9331eb4a596da87954e9",
4819                                   "30440220048a41c660c4841693de037d00a407810389f4574b3286afb7bc392a438fa3f802200401d71fa87c64fe621b49ac07e3bf85157ac680acb977124da28652cc7f1a5c",
4820                                   "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"}
4821                 });
4822
4823                 // commitment tx with three outputs untrimmed (minimum feerate)
4824                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4825                 chan.feerate_per_kw = 3703;
4826
4827                 test_commitment!("30450221008b7c191dd46893b67b628e618d2dc8e81169d38bade310181ab77d7c94c6675e02203b4dd131fd7c9deb299560983dcdc485545c98f989f7ae8180c28289f9e6bdb0",
4828                                  "3044022047305531dd44391dce03ae20f8735005c615eb077a974edb0059ea1a311857d602202e0ed6972fbdd1e8cb542b06e0929bc41b2ddf236e04cb75edd56151f4197506",
4829                                  "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", {
4830
4831                                  { 0,
4832                                   "3044022044f65cf833afdcb9d18795ca93f7230005777662539815b8a601eeb3e57129a902206a4bf3e53392affbba52640627defa8dc8af61c958c9e827b2798ab45828abdd",
4833                                   "3045022100b94d931a811b32eeb885c28ddcf999ae1981893b21dd1329929543fe87ce793002206370107fdd151c5f2384f9ceb71b3107c69c74c8ed5a28a94a4ab2d27d3b0724",
4834                                   "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"}
4835                 });
4836
4837                 // commitment tx with three outputs untrimmed (maximum feerate)
4838                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4839                 chan.feerate_per_kw = 4914;
4840
4841                 test_commitment!("304402206d6cb93969d39177a09d5d45b583f34966195b77c7e585cf47ac5cce0c90cefb022031d71ae4e33a4e80df7f981d696fbdee517337806a3c7138b7491e2cbb077a0e",
4842                                  "304402206a2679efa3c7aaffd2a447fd0df7aba8792858b589750f6a1203f9259173198a022008d52a0e77a99ab533c36206cb15ad7aeb2aa72b93d4b571e728cb5ec2f6fe26",
4843                                  "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", {
4844
4845                                  { 0,
4846                                   "3045022100fcb38506bfa11c02874092a843d0cc0a8613c23b639832564a5f69020cb0f6ba02206508b9e91eaa001425c190c68ee5f887e1ad5b1b314002e74db9dbd9e42dbecf",
4847                                   "304502210086e76b460ddd3cea10525fba298405d3fe11383e56966a5091811368362f689a02200f72ee75657915e0ede89c28709acd113ede9e1b7be520e3bc5cda425ecd6e68",
4848                                   "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"}
4849                 });
4850
4851                 // commitment tx with two outputs untrimmed (minimum feerate)
4852                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4853                 chan.feerate_per_kw = 4915;
4854
4855                 test_commitment!("304402200769ba89c7330dfa4feba447b6e322305f12ac7dac70ec6ba997ed7c1b598d0802204fe8d337e7fee781f9b7b1a06e580b22f4f79d740059560191d7db53f8765552",
4856                                  "3045022100a012691ba6cea2f73fa8bac37750477e66363c6d28813b0bb6da77c8eb3fb0270220365e99c51304b0b1a6ab9ea1c8500db186693e39ec1ad5743ee231b0138384b9",
4857                                  "02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b8002c0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de843110fa926a00000000002200204adb4e2f00643db396dd120d4e7dc17625f5f2c11a40d857accc862d6b7dd80e0400483045022100a012691ba6cea2f73fa8bac37750477e66363c6d28813b0bb6da77c8eb3fb0270220365e99c51304b0b1a6ab9ea1c8500db186693e39ec1ad5743ee231b0138384b90147304402200769ba89c7330dfa4feba447b6e322305f12ac7dac70ec6ba997ed7c1b598d0802204fe8d337e7fee781f9b7b1a06e580b22f4f79d740059560191d7db53f876555201475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220", {});
4858
4859                 // commitment tx with two outputs untrimmed (maximum feerate)
4860                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4861                 chan.feerate_per_kw = 9651180;
4862
4863                 test_commitment!("3044022037f83ff00c8e5fb18ae1f918ffc24e54581775a20ff1ae719297ef066c71caa9022039c529cccd89ff6c5ed1db799614533844bd6d101da503761c45c713996e3bbd",
4864                                  "30440220514f977bf7edc442de8ce43ace9686e5ebdc0f893033f13e40fb46c8b8c6e1f90220188006227d175f5c35da0b092c57bea82537aed89f7778204dc5bacf4f29f2b9",
4865                                  "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", {});
4866
4867                 // commitment tx with one output untrimmed (minimum feerate)
4868                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4869                 chan.feerate_per_kw = 9651181;
4870
4871                 test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
4872                                  "3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
4873                                  "02000000000101bef67e4e2fb9ddeeb3461973cd4c62abb35050b1add772995b820b584a488489000000000038b02b8001c0c62d0000000000160014ccf1af2f2aabee14bb40fa3851ab2301de8431100400473044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b101473044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e01475221023da092f6980e58d2c037173180e9a465476026ee50f96695963e8efe436f54eb21030e9f7b623d2ccc7c9bd44d66d5ce21ce504c0acf6385a132cec6d3c39fa711c152ae3e195220", {});
4874
4875                 // commitment tx with fee greater than funder amount
4876                 chan.value_to_self_msat = 6993000000; // 7000000000 - 7000000
4877                 chan.feerate_per_kw = 9651936;
4878
4879                 test_commitment!("3044022064901950be922e62cbe3f2ab93de2b99f37cff9fc473e73e394b27f88ef0731d02206d1dfa227527b4df44a07599289e207d6fd9cca60c0365682dcd3deaf739567e",
4880                                  "3044022031a82b51bd014915fe68928d1abf4b9885353fb896cac10c3fdd88d7f9c7f2e00220716bda819641d2c63e65d3549b6120112e1aeaf1742eed94a471488e79e206b1",
4881                                  "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", {});
4882         }
4883
4884         #[test]
4885         fn test_per_commitment_secret_gen() {
4886                 // Test vectors from BOLT 3 Appendix D:
4887
4888                 let mut seed = [0; 32];
4889                 seed[0..32].clone_from_slice(&hex::decode("0000000000000000000000000000000000000000000000000000000000000000").unwrap());
4890                 assert_eq!(chan_utils::build_commitment_secret(&seed, 281474976710655),
4891                            hex::decode("02a40c85b6f28da08dfdbe0926c53fab2de6d28c10301f8f7c4073d5e42e3148").unwrap()[..]);
4892
4893                 seed[0..32].clone_from_slice(&hex::decode("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF").unwrap());
4894                 assert_eq!(chan_utils::build_commitment_secret(&seed, 281474976710655),
4895                            hex::decode("7cc854b54e3e0dcdb010d7a3fee464a9687be6e8db3be6854c475621e007a5dc").unwrap()[..]);
4896
4897                 assert_eq!(chan_utils::build_commitment_secret(&seed, 0xaaaaaaaaaaa),
4898                            hex::decode("56f4008fb007ca9acf0e15b054d5c9fd12ee06cea347914ddbaed70d1c13a528").unwrap()[..]);
4899
4900                 assert_eq!(chan_utils::build_commitment_secret(&seed, 0x555555555555),
4901                            hex::decode("9015daaeb06dba4ccc05b91b2f73bd54405f2be9f217fbacd3c5ac2e62327d31").unwrap()[..]);
4902
4903                 seed[0..32].clone_from_slice(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap());
4904                 assert_eq!(chan_utils::build_commitment_secret(&seed, 1),
4905                            hex::decode("915c75942a26bb3a433a8ce2cb0427c29ec6c1775cfc78328b57f6ba7bfeaa9c").unwrap()[..]);
4906         }
4907
4908         #[test]
4909         fn test_key_derivation() {
4910                 // Test vectors from BOLT 3 Appendix E:
4911                 let secp_ctx = Secp256k1::new();
4912
4913                 let base_secret = SecretKey::from_slice(&hex::decode("000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f").unwrap()[..]).unwrap();
4914                 let per_commitment_secret = SecretKey::from_slice(&hex::decode("1f1e1d1c1b1a191817161514131211100f0e0d0c0b0a09080706050403020100").unwrap()[..]).unwrap();
4915
4916                 let base_point = PublicKey::from_secret_key(&secp_ctx, &base_secret);
4917                 assert_eq!(base_point.serialize()[..], hex::decode("036d6caac248af96f6afa7f904f550253a0f3ef3f5aa2fe6838a95b216691468e2").unwrap()[..]);
4918
4919                 let per_commitment_point = PublicKey::from_secret_key(&secp_ctx, &per_commitment_secret);
4920                 assert_eq!(per_commitment_point.serialize()[..], hex::decode("025f7117a78150fe2ef97db7cfc83bd57b2e2c0d0dd25eaf467a4a1c2a45ce1486").unwrap()[..]);
4921
4922                 assert_eq!(chan_utils::derive_public_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
4923                                 hex::decode("0235f2dbfaa89b57ec7b055afe29849ef7ddfeb1cefdb9ebdc43f5494984db29e5").unwrap()[..]);
4924
4925                 assert_eq!(chan_utils::derive_private_key(&secp_ctx, &per_commitment_point, &base_secret).unwrap(),
4926                                 SecretKey::from_slice(&hex::decode("cbced912d3b21bf196a766651e436aff192362621ce317704ea2f75d87e7be0f").unwrap()[..]).unwrap());
4927
4928                 assert_eq!(chan_utils::derive_public_revocation_key(&secp_ctx, &per_commitment_point, &base_point).unwrap().serialize()[..],
4929                                 hex::decode("02916e326636d19c33f13e8c0c3a03dd157f332f3e99c317c141dd865eb01f8ff0").unwrap()[..]);
4930
4931                 assert_eq!(chan_utils::derive_private_revocation_key(&secp_ctx, &per_commitment_secret, &base_secret).unwrap(),
4932                                 SecretKey::from_slice(&hex::decode("d09ffff62ddb2297ab000cc85bcb4283fdeb6aa052affbc9dddcf33b61078110").unwrap()[..]).unwrap());
4933         }
4934 }