1 //! The top-level channel management and payment tracking stuff lives here.
3 //! The ChannelManager is the main chunk of logic implementing the lightning protocol and is
4 //! responsible for tracking which channels are open, HTLCs are in flight and reestablishing those
5 //! upon reconnect to the relevant peer(s).
7 //! It does not manage routing logic (see ln::router for that) nor does it manage constructing
8 //! on-chain transactions (it only monitors the chain to watch for any force-closes that might
9 //! imply it needs to fail HTLCs/payments/channels it manages).
11 use bitcoin::blockdata::block::BlockHeader;
12 use bitcoin::blockdata::transaction::Transaction;
13 use bitcoin::blockdata::constants::genesis_block;
14 use bitcoin::network::constants::Network;
15 use bitcoin::util::hash::BitcoinHash;
17 use bitcoin_hashes::{Hash, HashEngine};
18 use bitcoin_hashes::hmac::{Hmac, HmacEngine};
19 use bitcoin_hashes::sha256::Hash as Sha256;
20 use bitcoin_hashes::sha256d::Hash as Sha256dHash;
21 use bitcoin_hashes::cmp::fixed_time_eq;
23 use secp256k1::key::{SecretKey,PublicKey};
24 use secp256k1::Secp256k1;
25 use secp256k1::ecdh::SharedSecret;
28 use chain::chaininterface::{BroadcasterInterface,ChainListener,FeeEstimator};
29 use chain::transaction::OutPoint;
30 use ln::channel::{Channel, ChannelError};
31 use ln::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateErr, ManyChannelMonitor, CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD_BLOCKS, ANTI_REORG_DELAY};
32 use ln::features::{InitFeatures, NodeFeatures};
33 use ln::router::Route;
36 use ln::msgs::{ChannelMessageHandler, DecodeError, LightningError};
37 use chain::keysinterface::{ChannelKeys, KeysInterface, KeysManager, InMemoryChannelKeys};
38 use util::config::UserConfig;
39 use util::{byte_utils, events};
40 use util::ser::{Readable, ReadableArgs, Writeable, Writer};
41 use util::chacha20::{ChaCha20, ChaChaReader};
42 use util::logger::Logger;
43 use util::errors::APIError;
46 use std::collections::{HashMap, hash_map, HashSet};
47 use std::io::{Cursor, Read};
48 use std::sync::{Arc, Mutex, MutexGuard, RwLock};
49 use std::sync::atomic::{AtomicUsize, Ordering};
50 use std::time::Duration;
51 use std::marker::{Sync, Send};
54 // We hold various information about HTLC relay in the HTLC objects in Channel itself:
56 // Upon receipt of an HTLC from a peer, we'll give it a PendingHTLCStatus indicating if it should
57 // forward the HTLC with information it will give back to us when it does so, or if it should Fail
58 // the HTLC with the relevant message for the Channel to handle giving to the remote peer.
60 // Once said HTLC is committed in the Channel, if the PendingHTLCStatus indicated Forward, the
61 // Channel will return the PendingHTLCInfo back to us, and we will create an HTLCForwardInfo
62 // with it to track where it came from (in case of onwards-forward error), waiting a random delay
63 // before we forward it.
65 // We will then use HTLCForwardInfo's PendingHTLCInfo to construct an outbound HTLC, with a
66 // relevant HTLCSource::PreviousHopData filled in to indicate where it came from (which we can use
67 // to either fail-backwards or fulfill the HTLC backwards along the relevant path).
68 // Alternatively, we can fill an outbound HTLC with a HTLCSource::OutboundRoute indicating this is
69 // our payment, which we can use to decode errors or inform the user that the payment was sent.
71 #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
72 pub(super) struct PendingHTLCInfo {
73 onion_packet: Option<msgs::OnionPacket>,
74 incoming_shared_secret: [u8; 32],
75 payment_hash: PaymentHash,
76 short_channel_id: u64,
77 pub(super) amt_to_forward: u64,
78 pub(super) outgoing_cltv_value: u32,
81 #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
82 pub(super) enum HTLCFailureMsg {
83 Relay(msgs::UpdateFailHTLC),
84 Malformed(msgs::UpdateFailMalformedHTLC),
87 /// Stores whether we can't forward an HTLC or relevant forwarding info
88 #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
89 pub(super) enum PendingHTLCStatus {
90 Forward(PendingHTLCInfo),
94 pub(super) enum HTLCForwardInfo {
96 prev_short_channel_id: u64,
98 forward_info: PendingHTLCInfo,
102 err_packet: msgs::OnionErrorPacket,
106 /// Tracks the inbound corresponding to an outbound HTLC
107 #[derive(Clone, PartialEq)]
108 pub(super) struct HTLCPreviousHopData {
109 short_channel_id: u64,
111 incoming_packet_shared_secret: [u8; 32],
114 /// Tracks the inbound corresponding to an outbound HTLC
115 #[derive(Clone, PartialEq)]
116 pub(super) enum HTLCSource {
117 PreviousHopData(HTLCPreviousHopData),
120 session_priv: SecretKey,
121 /// Technically we can recalculate this from the route, but we cache it here to avoid
122 /// doing a double-pass on route when we get a failure back
123 first_hop_htlc_msat: u64,
128 pub fn dummy() -> Self {
129 HTLCSource::OutboundRoute {
130 route: Route { hops: Vec::new() },
131 session_priv: SecretKey::from_slice(&[1; 32]).unwrap(),
132 first_hop_htlc_msat: 0,
137 #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
138 pub(super) enum HTLCFailReason {
140 err: msgs::OnionErrorPacket,
148 /// payment_hash type, use to cross-lock hop
149 #[derive(Hash, Copy, Clone, PartialEq, Eq, Debug)]
150 pub struct PaymentHash(pub [u8;32]);
151 /// payment_preimage type, use to route payment between hop
152 #[derive(Hash, Copy, Clone, PartialEq, Eq, Debug)]
153 pub struct PaymentPreimage(pub [u8;32]);
155 type ShutdownResult = (Option<OutPoint>, ChannelMonitorUpdate, Vec<(HTLCSource, PaymentHash)>);
157 /// Error type returned across the channel_state mutex boundary. When an Err is generated for a
158 /// Channel, we generally end up with a ChannelError::Close for which we have to close the channel
159 /// immediately (ie with no further calls on it made). Thus, this step happens inside a
160 /// channel_state lock. We then return the set of things that need to be done outside the lock in
161 /// this struct and call handle_error!() on it.
163 struct MsgHandleErrInternal {
164 err: msgs::LightningError,
165 shutdown_finish: Option<(ShutdownResult, Option<msgs::ChannelUpdate>)>,
167 impl MsgHandleErrInternal {
169 fn send_err_msg_no_close(err: &'static str, channel_id: [u8; 32]) -> Self {
171 err: LightningError {
173 action: msgs::ErrorAction::SendErrorMessage {
174 msg: msgs::ErrorMessage {
176 data: err.to_string()
180 shutdown_finish: None,
184 fn ignore_no_close(err: &'static str) -> Self {
186 err: LightningError {
188 action: msgs::ErrorAction::IgnoreError,
190 shutdown_finish: None,
194 fn from_no_close(err: msgs::LightningError) -> Self {
195 Self { err, shutdown_finish: None }
198 fn from_finish_shutdown(err: &'static str, channel_id: [u8; 32], shutdown_res: ShutdownResult, channel_update: Option<msgs::ChannelUpdate>) -> Self {
200 err: LightningError {
202 action: msgs::ErrorAction::SendErrorMessage {
203 msg: msgs::ErrorMessage {
205 data: err.to_string()
209 shutdown_finish: Some((shutdown_res, channel_update)),
213 fn from_chan_no_close(err: ChannelError, channel_id: [u8; 32]) -> Self {
216 ChannelError::Ignore(msg) => LightningError {
218 action: msgs::ErrorAction::IgnoreError,
220 ChannelError::Close(msg) => LightningError {
222 action: msgs::ErrorAction::SendErrorMessage {
223 msg: msgs::ErrorMessage {
225 data: msg.to_string()
229 ChannelError::CloseDelayBroadcast { msg, .. } => LightningError {
231 action: msgs::ErrorAction::SendErrorMessage {
232 msg: msgs::ErrorMessage {
234 data: msg.to_string()
239 shutdown_finish: None,
244 /// We hold back HTLCs we intend to relay for a random interval greater than this (see
245 /// Event::PendingHTLCsForwardable for the API guidelines indicating how long should be waited).
246 /// This provides some limited amount of privacy. Ideally this would range from somewhere like one
247 /// second to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly.
248 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u64 = 100;
250 /// For events which result in both a RevokeAndACK and a CommitmentUpdate, by default they should
251 /// be sent in the order they appear in the return value, however sometimes the order needs to be
252 /// variable at runtime (eg Channel::channel_reestablish needs to re-send messages in the order
253 /// they were originally sent). In those cases, this enum is also returned.
254 #[derive(Clone, PartialEq)]
255 pub(super) enum RAACommitmentOrder {
256 /// Send the CommitmentUpdate messages first
258 /// Send the RevokeAndACK message first
262 // Note this is only exposed in cfg(test):
263 pub(super) struct ChannelHolder<ChanSigner: ChannelKeys> {
264 pub(super) by_id: HashMap<[u8; 32], Channel<ChanSigner>>,
265 pub(super) short_to_id: HashMap<u64, [u8; 32]>,
266 /// short channel id -> forward infos. Key of 0 means payments received
267 /// Note that while this is held in the same mutex as the channels themselves, no consistency
268 /// guarantees are made about the existence of a channel with the short id here, nor the short
269 /// ids in the PendingHTLCInfo!
270 pub(super) forward_htlcs: HashMap<u64, Vec<HTLCForwardInfo>>,
271 /// payment_hash -> Vec<(amount_received, htlc_source)> for tracking things that were to us and
272 /// can be failed/claimed by the user
273 /// Note that while this is held in the same mutex as the channels themselves, no consistency
274 /// guarantees are made about the channels given here actually existing anymore by the time you
276 pub(super) claimable_htlcs: HashMap<PaymentHash, Vec<(u64, HTLCPreviousHopData)>>,
277 /// Messages to send to peers - pushed to in the same lock that they are generated in (except
278 /// for broadcast messages, where ordering isn't as strict).
279 pub(super) pending_msg_events: Vec<events::MessageSendEvent>,
282 /// State we hold per-peer. In the future we should put channels in here, but for now we only hold
283 /// the latest Init features we heard from the peer.
285 latest_features: InitFeatures,
288 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
289 const ERR: () = "You need at least 32 bit pointers (well, usize, but we'll assume they're the same) for ChannelManager::latest_block_height";
291 /// SimpleArcChannelManager is useful when you need a ChannelManager with a static lifetime, e.g.
292 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
293 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
294 /// SimpleRefChannelManager is the more appropriate type. Defining these type aliases prevents
295 /// issues such as overly long function definitions. Note that the ChannelManager can take any
296 /// type that implements KeysInterface for its keys manager, but this type alias chooses the
297 /// concrete type of the KeysManager.
298 pub type SimpleArcChannelManager<M, T, F> = Arc<ChannelManager<InMemoryChannelKeys, Arc<M>, Arc<T>, Arc<KeysManager>, Arc<F>>>;
300 /// SimpleRefChannelManager is a type alias for a ChannelManager reference, and is the reference
301 /// counterpart to the SimpleArcChannelManager type alias. Use this type by default when you don't
302 /// need a ChannelManager with a static lifetime. You'll need a static lifetime in cases such as
303 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
304 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
305 /// helps with issues such as long function definitions. Note that the ChannelManager can take any
306 /// type that implements KeysInterface for its keys manager, but this type alias chooses the
307 /// concrete type of the KeysManager.
308 pub type SimpleRefChannelManager<'a, 'b, 'c, 'd, M, T, F> = ChannelManager<InMemoryChannelKeys, &'a M, &'b T, &'c KeysManager, &'d F>;
310 /// Manager which keeps track of a number of channels and sends messages to the appropriate
311 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
313 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
314 /// to individual Channels.
316 /// Implements Writeable to write out all channel state to disk. Implies peer_disconnected() for
317 /// all peers during write/read (though does not modify this instance, only the instance being
318 /// serialized). This will result in any channels which have not yet exchanged funding_created (ie
319 /// called funding_transaction_generated for outbound channels).
321 /// Note that you can be a bit lazier about writing out ChannelManager than you can be with
322 /// ChannelMonitors. With ChannelMonitors you MUST write each monitor update out to disk before
323 /// returning from ManyChannelMonitor::add_/update_monitor, with ChannelManagers, writing updates
324 /// happens out-of-band (and will prevent any other ChannelManager operations from occurring during
325 /// the serialization process). If the deserialized version is out-of-date compared to the
326 /// ChannelMonitors passed by reference to read(), those channels will be force-closed based on the
327 /// ChannelMonitor state and no funds will be lost (mod on-chain transaction fees).
329 /// Note that the deserializer is only implemented for (Sha256dHash, ChannelManager), which
330 /// tells you the last block hash which was block_connect()ed. You MUST rescan any blocks along
331 /// the "reorg path" (ie call block_disconnected() until you get to a common block and then call
332 /// block_connected() to step towards your best block) upon deserialization before using the
335 /// Note that ChannelManager is responsible for tracking liveness of its channels and generating
336 /// ChannelUpdate messages informing peers that the channel is temporarily disabled. To avoid
337 /// spam due to quick disconnection/reconnection, updates are not sent until the channel has been
338 /// offline for a full minute. In order to track this, you must call
339 /// timer_chan_freshness_every_min roughly once per minute, though it doesn't have to be perfect.
341 /// Rather than using a plain ChannelManager, it is preferable to use either a SimpleArcChannelManager
342 /// a SimpleRefChannelManager, for conciseness. See their documentation for more details, but
343 /// essentially you should default to using a SimpleRefChannelManager, and use a
344 /// SimpleArcChannelManager when you require a ChannelManager with a static lifetime, such as when
345 /// you're using lightning-net-tokio.
346 pub struct ChannelManager<ChanSigner: ChannelKeys, M: Deref, T: Deref, K: Deref, F: Deref>
347 where M::Target: ManyChannelMonitor<ChanSigner>,
348 T::Target: BroadcasterInterface,
349 K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
350 F::Target: FeeEstimator,
352 default_configuration: UserConfig,
353 genesis_hash: Sha256dHash,
359 pub(super) latest_block_height: AtomicUsize,
361 latest_block_height: AtomicUsize,
362 last_block_hash: Mutex<Sha256dHash>,
363 secp_ctx: Secp256k1<secp256k1::All>,
366 pub(super) channel_state: Mutex<ChannelHolder<ChanSigner>>,
368 channel_state: Mutex<ChannelHolder<ChanSigner>>,
369 our_network_key: SecretKey,
371 /// Used to track the last value sent in a node_announcement "timestamp" field. We ensure this
372 /// value increases strictly since we don't assume access to a time source.
373 last_node_announcement_serial: AtomicUsize,
375 /// The bulk of our storage will eventually be here (channels and message queues and the like).
376 /// If we are connected to a peer we always at least have an entry here, even if no channels
377 /// are currently open with that peer.
378 /// Because adding or removing an entry is rare, we usually take an outer read lock and then
379 /// operate on the inner value freely. Sadly, this prevents parallel operation when opening a
381 per_peer_state: RwLock<HashMap<PublicKey, Mutex<PeerState>>>,
383 pending_events: Mutex<Vec<events::Event>>,
384 /// Used when we have to take a BIG lock to make sure everything is self-consistent.
385 /// Essentially just when we're serializing ourselves out.
386 /// Taken first everywhere where we are making changes before any other locks.
387 total_consistency_lock: RwLock<()>,
394 /// The amount of time we require our counterparty wait to claim their money (ie time between when
395 /// we, or our watchtower, must check for them having broadcast a theft transaction).
396 pub(crate) const BREAKDOWN_TIMEOUT: u16 = 6 * 24;
397 /// The amount of time we're willing to wait to claim money back to us
398 pub(crate) const MAX_LOCAL_BREAKDOWN_TIMEOUT: u16 = 6 * 24 * 7;
400 /// The minimum number of blocks between an inbound HTLC's CLTV and the corresponding outbound
401 /// HTLC's CLTV. This should always be a few blocks greater than channelmonitor::CLTV_CLAIM_BUFFER,
402 /// ie the node we forwarded the payment on to should always have enough room to reliably time out
403 /// the HTLC via a full update_fail_htlc/commitment_signed dance before we hit the
404 /// CLTV_CLAIM_BUFFER point (we static assert that it's at least 3 blocks more).
405 const CLTV_EXPIRY_DELTA: u16 = 6 * 12; //TODO?
406 pub(super) const CLTV_FAR_FAR_AWAY: u32 = 6 * 24 * 7; //TODO?
408 // Check that our CLTV_EXPIRY is at least CLTV_CLAIM_BUFFER + ANTI_REORG_DELAY + LATENCY_GRACE_PERIOD_BLOCKS,
409 // ie that if the next-hop peer fails the HTLC within
410 // LATENCY_GRACE_PERIOD_BLOCKS then we'll still have CLTV_CLAIM_BUFFER left to timeout it onchain,
411 // then waiting ANTI_REORG_DELAY to be reorg-safe on the outbound HLTC and
412 // failing the corresponding htlc backward, and us now seeing the last block of ANTI_REORG_DELAY before
413 // LATENCY_GRACE_PERIOD_BLOCKS.
416 const CHECK_CLTV_EXPIRY_SANITY: u32 = CLTV_EXPIRY_DELTA as u32 - LATENCY_GRACE_PERIOD_BLOCKS - CLTV_CLAIM_BUFFER - ANTI_REORG_DELAY - LATENCY_GRACE_PERIOD_BLOCKS;
418 // Check for ability of an attacker to make us fail on-chain by delaying inbound claim. See
419 // ChannelMontior::would_broadcast_at_height for a description of why this is needed.
422 const CHECK_CLTV_EXPIRY_SANITY_2: u32 = CLTV_EXPIRY_DELTA as u32 - LATENCY_GRACE_PERIOD_BLOCKS - 2*CLTV_CLAIM_BUFFER;
424 macro_rules! secp_call {
425 ( $res: expr, $err: expr ) => {
428 Err(_) => return Err($err),
433 /// Details of a channel, as returned by ChannelManager::list_channels and ChannelManager::list_usable_channels
434 pub struct ChannelDetails {
435 /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
436 /// thereafter this is the txid of the funding transaction xor the funding transaction output).
437 /// Note that this means this value is *not* persistent - it can change once during the
438 /// lifetime of the channel.
439 pub channel_id: [u8; 32],
440 /// The position of the funding transaction in the chain. None if the funding transaction has
441 /// not yet been confirmed and the channel fully opened.
442 pub short_channel_id: Option<u64>,
443 /// The node_id of our counterparty
444 pub remote_network_id: PublicKey,
445 /// The Features the channel counterparty provided upon last connection.
446 /// Useful for routing as it is the most up-to-date copy of the counterparty's features and
447 /// many routing-relevant features are present in the init context.
448 pub counterparty_features: InitFeatures,
449 /// The value, in satoshis, of this channel as appears in the funding output
450 pub channel_value_satoshis: u64,
451 /// The user_id passed in to create_channel, or 0 if the channel was inbound.
453 /// The available outbound capacity for sending HTLCs to the remote peer. This does not include
454 /// any pending HTLCs which are not yet fully resolved (and, thus, who's balance is not
455 /// available for inclusion in new outbound HTLCs). This further does not include any pending
456 /// outgoing HTLCs which are awaiting some other resolution to be sent.
457 pub outbound_capacity_msat: u64,
458 /// The available inbound capacity for the remote peer to send HTLCs to us. This does not
459 /// include any pending HTLCs which are not yet fully resolved (and, thus, who's balance is not
460 /// available for inclusion in new inbound HTLCs).
461 /// Note that there are some corner cases not fully handled here, so the actual available
462 /// inbound capacity may be slightly higher than this.
463 pub inbound_capacity_msat: u64,
464 /// True if the channel is (a) confirmed and funding_locked messages have been exchanged, (b)
465 /// the peer is connected, and (c) no monitor update failure is pending resolution.
469 macro_rules! handle_error {
470 ($self: ident, $internal: expr, $their_node_id: expr) => {
473 Err(MsgHandleErrInternal { err, shutdown_finish }) => {
474 #[cfg(debug_assertions)]
476 // In testing, ensure there are no deadlocks where the lock is already held upon
477 // entering the macro.
478 assert!($self.channel_state.try_lock().is_ok());
481 let mut msg_events = Vec::with_capacity(2);
483 if let Some((shutdown_res, update_option)) = shutdown_finish {
484 $self.finish_force_close_channel(shutdown_res);
485 if let Some(update) = update_option {
486 msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
492 log_error!($self, "{}", err.err);
493 if let msgs::ErrorAction::IgnoreError = err.action {
495 msg_events.push(events::MessageSendEvent::HandleError {
496 node_id: $their_node_id,
497 action: err.action.clone()
501 if !msg_events.is_empty() {
502 $self.channel_state.lock().unwrap().pending_msg_events.append(&mut msg_events);
505 // Return error in case higher-API need one
512 macro_rules! break_chan_entry {
513 ($self: ident, $res: expr, $channel_state: expr, $entry: expr) => {
516 Err(ChannelError::Ignore(msg)) => {
517 break Err(MsgHandleErrInternal::from_chan_no_close(ChannelError::Ignore(msg), $entry.key().clone()))
519 Err(ChannelError::Close(msg)) => {
520 log_trace!($self, "Closing channel {} due to Close-required error: {}", log_bytes!($entry.key()[..]), msg);
521 let (channel_id, mut chan) = $entry.remove_entry();
522 if let Some(short_id) = chan.get_short_channel_id() {
523 $channel_state.short_to_id.remove(&short_id);
525 break Err(MsgHandleErrInternal::from_finish_shutdown(msg, channel_id, chan.force_shutdown(true), $self.get_channel_update(&chan).ok())) },
526 Err(ChannelError::CloseDelayBroadcast { .. }) => { panic!("Wait is only generated on receipt of channel_reestablish, which is handled by try_chan_entry, we don't bother to support it here"); }
531 macro_rules! try_chan_entry {
532 ($self: ident, $res: expr, $channel_state: expr, $entry: expr) => {
535 Err(ChannelError::Ignore(msg)) => {
536 return Err(MsgHandleErrInternal::from_chan_no_close(ChannelError::Ignore(msg), $entry.key().clone()))
538 Err(ChannelError::Close(msg)) => {
539 log_trace!($self, "Closing channel {} due to Close-required error: {}", log_bytes!($entry.key()[..]), msg);
540 let (channel_id, mut chan) = $entry.remove_entry();
541 if let Some(short_id) = chan.get_short_channel_id() {
542 $channel_state.short_to_id.remove(&short_id);
544 return Err(MsgHandleErrInternal::from_finish_shutdown(msg, channel_id, chan.force_shutdown(true), $self.get_channel_update(&chan).ok()))
546 Err(ChannelError::CloseDelayBroadcast { msg, update }) => {
547 log_error!($self, "Channel {} need to be shutdown but closing transactions not broadcast due to {}", log_bytes!($entry.key()[..]), msg);
548 let (channel_id, mut chan) = $entry.remove_entry();
549 if let Some(short_id) = chan.get_short_channel_id() {
550 $channel_state.short_to_id.remove(&short_id);
552 if let Err(e) = $self.monitor.update_monitor(chan.get_funding_txo().unwrap(), update) {
554 // Upstream channel is dead, but we want at least to fail backward HTLCs to save
555 // downstream channels. In case of PermanentFailure, we are not going to be able
556 // to claim back to_remote output on remote commitment transaction. Doesn't
557 // make a difference here, we are concern about HTLCs circuit, not onchain funds.
558 ChannelMonitorUpdateErr::PermanentFailure => {},
559 ChannelMonitorUpdateErr::TemporaryFailure => {},
562 let shutdown_res = chan.force_shutdown(false);
563 return Err(MsgHandleErrInternal::from_finish_shutdown(msg, channel_id, shutdown_res, $self.get_channel_update(&chan).ok()))
569 macro_rules! handle_monitor_err {
570 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr) => {
571 handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, $resend_raa, $resend_commitment, Vec::new(), Vec::new())
573 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr, $failed_forwards: expr, $failed_fails: expr) => {
575 ChannelMonitorUpdateErr::PermanentFailure => {
576 log_error!($self, "Closing channel {} due to monitor update PermanentFailure", log_bytes!($entry.key()[..]));
577 let (channel_id, mut chan) = $entry.remove_entry();
578 if let Some(short_id) = chan.get_short_channel_id() {
579 $channel_state.short_to_id.remove(&short_id);
581 // TODO: $failed_fails is dropped here, which will cause other channels to hit the
582 // chain in a confused state! We need to move them into the ChannelMonitor which
583 // will be responsible for failing backwards once things confirm on-chain.
584 // It's ok that we drop $failed_forwards here - at this point we'd rather they
585 // broadcast HTLC-Timeout and pay the associated fees to get their funds back than
586 // us bother trying to claim it just to forward on to another peer. If we're
587 // splitting hairs we'd prefer to claim payments that were to us, but we haven't
588 // given up the preimage yet, so might as well just wait until the payment is
589 // retried, avoiding the on-chain fees.
590 let res: Result<(), _> = Err(MsgHandleErrInternal::from_finish_shutdown("ChannelMonitor storage failure", channel_id, chan.force_shutdown(true), $self.get_channel_update(&chan).ok()));
593 ChannelMonitorUpdateErr::TemporaryFailure => {
594 log_info!($self, "Disabling channel {} due to monitor update TemporaryFailure. On restore will send {} and process {} forwards and {} fails",
595 log_bytes!($entry.key()[..]),
596 if $resend_commitment && $resend_raa {
598 RAACommitmentOrder::CommitmentFirst => { "commitment then RAA" },
599 RAACommitmentOrder::RevokeAndACKFirst => { "RAA then commitment" },
601 } else if $resend_commitment { "commitment" }
602 else if $resend_raa { "RAA" }
604 (&$failed_forwards as &Vec<(PendingHTLCInfo, u64)>).len(),
605 (&$failed_fails as &Vec<(HTLCSource, PaymentHash, HTLCFailReason)>).len());
606 if !$resend_commitment {
607 debug_assert!($action_type == RAACommitmentOrder::RevokeAndACKFirst || !$resend_raa);
610 debug_assert!($action_type == RAACommitmentOrder::CommitmentFirst || !$resend_commitment);
612 $entry.get_mut().monitor_update_failed($resend_raa, $resend_commitment, $failed_forwards, $failed_fails);
613 Err(MsgHandleErrInternal::from_chan_no_close(ChannelError::Ignore("Failed to update ChannelMonitor"), *$entry.key()))
619 macro_rules! return_monitor_err {
620 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr) => {
621 return handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, $resend_raa, $resend_commitment);
623 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr, $failed_forwards: expr, $failed_fails: expr) => {
624 return handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, $resend_raa, $resend_commitment, $failed_forwards, $failed_fails);
628 // Does not break in case of TemporaryFailure!
629 macro_rules! maybe_break_monitor_err {
630 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr) => {
631 match (handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, $resend_raa, $resend_commitment), $err) {
632 (e, ChannelMonitorUpdateErr::PermanentFailure) => {
635 (_, ChannelMonitorUpdateErr::TemporaryFailure) => { },
640 impl<ChanSigner: ChannelKeys, M: Deref, T: Deref, K: Deref, F: Deref> ChannelManager<ChanSigner, M, T, K, F>
641 where M::Target: ManyChannelMonitor<ChanSigner>,
642 T::Target: BroadcasterInterface,
643 K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
644 F::Target: FeeEstimator,
646 /// Constructs a new ChannelManager to hold several channels and route between them.
648 /// This is the main "logic hub" for all channel-related actions, and implements
649 /// ChannelMessageHandler.
651 /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
653 /// panics if channel_value_satoshis is >= `MAX_FUNDING_SATOSHIS`!
655 /// Users must provide the current blockchain height from which to track onchain channel
656 /// funding outpoints and send payments with reliable timelocks.
658 /// Users need to notify the new ChannelManager when a new block is connected or
659 /// disconnected using its `block_connected` and `block_disconnected` methods.
660 /// However, rather than calling these methods directly, the user should register
661 /// the ChannelManager as a listener to the BlockNotifier and call the BlockNotifier's
662 /// `block_(dis)connected` methods, which will notify all registered listeners in one
664 pub fn new(network: Network, fee_est: F, monitor: M, tx_broadcaster: T, logger: Arc<Logger>, keys_manager: K, config: UserConfig, current_blockchain_height: usize) -> Result<ChannelManager<ChanSigner, M, T, K, F>, secp256k1::Error> {
665 let secp_ctx = Secp256k1::new();
667 let res = ChannelManager {
668 default_configuration: config.clone(),
669 genesis_hash: genesis_block(network).header.bitcoin_hash(),
670 fee_estimator: fee_est,
674 latest_block_height: AtomicUsize::new(current_blockchain_height),
675 last_block_hash: Mutex::new(Default::default()),
678 channel_state: Mutex::new(ChannelHolder{
679 by_id: HashMap::new(),
680 short_to_id: HashMap::new(),
681 forward_htlcs: HashMap::new(),
682 claimable_htlcs: HashMap::new(),
683 pending_msg_events: Vec::new(),
685 our_network_key: keys_manager.get_node_secret(),
687 last_node_announcement_serial: AtomicUsize::new(0),
689 per_peer_state: RwLock::new(HashMap::new()),
691 pending_events: Mutex::new(Vec::new()),
692 total_consistency_lock: RwLock::new(()),
702 /// Creates a new outbound channel to the given remote node and with the given value.
704 /// user_id will be provided back as user_channel_id in FundingGenerationReady and
705 /// FundingBroadcastSafe events to allow tracking of which events correspond with which
706 /// create_channel call. Note that user_channel_id defaults to 0 for inbound channels, so you
707 /// may wish to avoid using 0 for user_id here.
709 /// If successful, will generate a SendOpenChannel message event, so you should probably poll
710 /// PeerManager::process_events afterwards.
712 /// Raises APIError::APIMisuseError when channel_value_satoshis > 2**24 or push_msat is
713 /// greater than channel_value_satoshis * 1k or channel_value_satoshis is < 1000.
714 pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, push_msat: u64, user_id: u64, override_config: Option<UserConfig>) -> Result<(), APIError> {
715 if channel_value_satoshis < 1000 {
716 return Err(APIError::APIMisuseError { err: "channel_value must be at least 1000 satoshis" });
719 let config = if override_config.is_some() { override_config.as_ref().unwrap() } else { &self.default_configuration };
720 let channel = Channel::new_outbound(&self.fee_estimator, &self.keys_manager, their_network_key, channel_value_satoshis, push_msat, user_id, Arc::clone(&self.logger), config)?;
721 let res = channel.get_open_channel(self.genesis_hash.clone(), &self.fee_estimator);
723 let _ = self.total_consistency_lock.read().unwrap();
724 let mut channel_state = self.channel_state.lock().unwrap();
725 match channel_state.by_id.entry(channel.channel_id()) {
726 hash_map::Entry::Occupied(_) => {
727 if cfg!(feature = "fuzztarget") {
728 return Err(APIError::APIMisuseError { err: "Fuzzy bad RNG" });
730 panic!("RNG is bad???");
733 hash_map::Entry::Vacant(entry) => { entry.insert(channel); }
735 channel_state.pending_msg_events.push(events::MessageSendEvent::SendOpenChannel {
736 node_id: their_network_key,
742 fn list_channels_with_filter<Fn: FnMut(&(&[u8; 32], &Channel<ChanSigner>)) -> bool>(&self, f: Fn) -> Vec<ChannelDetails> {
743 let mut res = Vec::new();
745 let channel_state = self.channel_state.lock().unwrap();
746 res.reserve(channel_state.by_id.len());
747 for (channel_id, channel) in channel_state.by_id.iter().filter(f) {
748 let (inbound_capacity_msat, outbound_capacity_msat) = channel.get_inbound_outbound_available_balance_msat();
749 res.push(ChannelDetails {
750 channel_id: (*channel_id).clone(),
751 short_channel_id: channel.get_short_channel_id(),
752 remote_network_id: channel.get_their_node_id(),
753 counterparty_features: InitFeatures::empty(),
754 channel_value_satoshis: channel.get_value_satoshis(),
755 inbound_capacity_msat,
756 outbound_capacity_msat,
757 user_id: channel.get_user_id(),
758 is_live: channel.is_live(),
762 let per_peer_state = self.per_peer_state.read().unwrap();
763 for chan in res.iter_mut() {
764 if let Some(peer_state) = per_peer_state.get(&chan.remote_network_id) {
765 chan.counterparty_features = peer_state.lock().unwrap().latest_features.clone();
771 /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
772 /// more information.
773 pub fn list_channels(&self) -> Vec<ChannelDetails> {
774 self.list_channels_with_filter(|_| true)
777 /// Gets the list of usable channels, in random order. Useful as an argument to
778 /// Router::get_route to ensure non-announced channels are used.
780 /// These are guaranteed to have their is_live value set to true, see the documentation for
781 /// ChannelDetails::is_live for more info on exactly what the criteria are.
782 pub fn list_usable_channels(&self) -> Vec<ChannelDetails> {
783 // Note we use is_live here instead of usable which leads to somewhat confused
784 // internal/external nomenclature, but that's ok cause that's probably what the user
785 // really wanted anyway.
786 self.list_channels_with_filter(|&(_, ref channel)| channel.is_live())
789 /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
790 /// will be accepted on the given channel, and after additional timeout/the closing of all
791 /// pending HTLCs, the channel will be closed on chain.
793 /// May generate a SendShutdown message event on success, which should be relayed.
794 pub fn close_channel(&self, channel_id: &[u8; 32]) -> Result<(), APIError> {
795 let _ = self.total_consistency_lock.read().unwrap();
797 let (mut failed_htlcs, chan_option) = {
798 let mut channel_state_lock = self.channel_state.lock().unwrap();
799 let channel_state = &mut *channel_state_lock;
800 match channel_state.by_id.entry(channel_id.clone()) {
801 hash_map::Entry::Occupied(mut chan_entry) => {
802 let (shutdown_msg, failed_htlcs) = chan_entry.get_mut().get_shutdown()?;
803 channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
804 node_id: chan_entry.get().get_their_node_id(),
807 if chan_entry.get().is_shutdown() {
808 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
809 channel_state.short_to_id.remove(&short_id);
811 (failed_htlcs, Some(chan_entry.remove_entry().1))
812 } else { (failed_htlcs, None) }
814 hash_map::Entry::Vacant(_) => return Err(APIError::ChannelUnavailable{err: "No such channel"})
817 for htlc_source in failed_htlcs.drain(..) {
818 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source.0, &htlc_source.1, HTLCFailReason::Reason { failure_code: 0x4000 | 8, data: Vec::new() });
820 let chan_update = if let Some(chan) = chan_option {
821 if let Ok(update) = self.get_channel_update(&chan) {
826 if let Some(update) = chan_update {
827 let mut channel_state = self.channel_state.lock().unwrap();
828 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
837 fn finish_force_close_channel(&self, shutdown_res: ShutdownResult) {
838 let (funding_txo_option, monitor_update, mut failed_htlcs) = shutdown_res;
839 log_trace!(self, "Finishing force-closure of channel {} HTLCs to fail", failed_htlcs.len());
840 for htlc_source in failed_htlcs.drain(..) {
841 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source.0, &htlc_source.1, HTLCFailReason::Reason { failure_code: 0x4000 | 8, data: Vec::new() });
843 if let Some(funding_txo) = funding_txo_option {
844 // There isn't anything we can do if we get an update failure - we're already
845 // force-closing. The monitor update on the required in-memory copy should broadcast
846 // the latest local state, which is the best we can do anyway. Thus, it is safe to
847 // ignore the result here.
848 let _ = self.monitor.update_monitor(funding_txo, monitor_update);
852 /// Force closes a channel, immediately broadcasting the latest local commitment transaction to
853 /// the chain and rejecting new HTLCs on the given channel.
854 pub fn force_close_channel(&self, channel_id: &[u8; 32]) {
855 let _ = self.total_consistency_lock.read().unwrap();
858 let mut channel_state_lock = self.channel_state.lock().unwrap();
859 let channel_state = &mut *channel_state_lock;
860 if let Some(chan) = channel_state.by_id.remove(channel_id) {
861 if let Some(short_id) = chan.get_short_channel_id() {
862 channel_state.short_to_id.remove(&short_id);
869 log_trace!(self, "Force-closing channel {}", log_bytes!(channel_id[..]));
870 self.finish_force_close_channel(chan.force_shutdown(true));
871 if let Ok(update) = self.get_channel_update(&chan) {
872 let mut channel_state = self.channel_state.lock().unwrap();
873 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
879 /// Force close all channels, immediately broadcasting the latest local commitment transaction
880 /// for each to the chain and rejecting new HTLCs on each.
881 pub fn force_close_all_channels(&self) {
882 for chan in self.list_channels() {
883 self.force_close_channel(&chan.channel_id);
887 fn decode_update_add_htlc_onion(&self, msg: &msgs::UpdateAddHTLC) -> (PendingHTLCStatus, MutexGuard<ChannelHolder<ChanSigner>>) {
888 macro_rules! return_malformed_err {
889 ($msg: expr, $err_code: expr) => {
891 log_info!(self, "Failed to accept/forward incoming HTLC: {}", $msg);
892 return (PendingHTLCStatus::Fail(HTLCFailureMsg::Malformed(msgs::UpdateFailMalformedHTLC {
893 channel_id: msg.channel_id,
894 htlc_id: msg.htlc_id,
895 sha256_of_onion: Sha256::hash(&msg.onion_routing_packet.hop_data).into_inner(),
896 failure_code: $err_code,
897 })), self.channel_state.lock().unwrap());
902 if let Err(_) = msg.onion_routing_packet.public_key {
903 return_malformed_err!("invalid ephemeral pubkey", 0x8000 | 0x4000 | 6);
906 let shared_secret = {
907 let mut arr = [0; 32];
908 arr.copy_from_slice(&SharedSecret::new(&msg.onion_routing_packet.public_key.unwrap(), &self.our_network_key)[..]);
911 let (rho, mu) = onion_utils::gen_rho_mu_from_shared_secret(&shared_secret);
913 if msg.onion_routing_packet.version != 0 {
914 //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
915 //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
916 //the hash doesn't really serve any purpose - in the case of hashing all data, the
917 //receiving node would have to brute force to figure out which version was put in the
918 //packet by the node that send us the message, in the case of hashing the hop_data, the
919 //node knows the HMAC matched, so they already know what is there...
920 return_malformed_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4);
923 let mut hmac = HmacEngine::<Sha256>::new(&mu);
924 hmac.input(&msg.onion_routing_packet.hop_data);
925 hmac.input(&msg.payment_hash.0[..]);
926 if !fixed_time_eq(&Hmac::from_engine(hmac).into_inner(), &msg.onion_routing_packet.hmac) {
927 return_malformed_err!("HMAC Check failed", 0x8000 | 0x4000 | 5);
930 let mut channel_state = None;
931 macro_rules! return_err {
932 ($msg: expr, $err_code: expr, $data: expr) => {
934 log_info!(self, "Failed to accept/forward incoming HTLC: {}", $msg);
935 if channel_state.is_none() {
936 channel_state = Some(self.channel_state.lock().unwrap());
938 return (PendingHTLCStatus::Fail(HTLCFailureMsg::Relay(msgs::UpdateFailHTLC {
939 channel_id: msg.channel_id,
940 htlc_id: msg.htlc_id,
941 reason: onion_utils::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
942 })), channel_state.unwrap());
947 let mut chacha = ChaCha20::new(&rho, &[0u8; 8]);
948 let mut chacha_stream = ChaChaReader { chacha: &mut chacha, read: Cursor::new(&msg.onion_routing_packet.hop_data[..]) };
949 let (next_hop_data, next_hop_hmac) = {
950 match msgs::OnionHopData::read(&mut chacha_stream) {
952 let error_code = match err {
953 msgs::DecodeError::UnknownVersion => 0x4000 | 1, // unknown realm byte
954 msgs::DecodeError::UnknownRequiredFeature|
955 msgs::DecodeError::InvalidValue|
956 msgs::DecodeError::ShortRead => 0x4000 | 22, // invalid_onion_payload
957 _ => 0x2000 | 2, // Should never happen
959 return_err!("Unable to decode our hop data", error_code, &[0;0]);
962 let mut hmac = [0; 32];
963 if let Err(_) = chacha_stream.read_exact(&mut hmac[..]) {
964 return_err!("Unable to decode hop data", 0x4000 | 22, &[0;0]);
971 let pending_forward_info = if next_hop_hmac == [0; 32] {
974 // In tests, make sure that the initial onion pcket data is, at least, non-0.
975 // We could do some fancy randomness test here, but, ehh, whatever.
976 // This checks for the issue where you can calculate the path length given the
977 // onion data as all the path entries that the originator sent will be here
978 // as-is (and were originally 0s).
979 // Of course reverse path calculation is still pretty easy given naive routing
980 // algorithms, but this fixes the most-obvious case.
981 let mut next_bytes = [0; 32];
982 chacha_stream.read_exact(&mut next_bytes).unwrap();
983 assert_ne!(next_bytes[..], [0; 32][..]);
984 chacha_stream.read_exact(&mut next_bytes).unwrap();
985 assert_ne!(next_bytes[..], [0; 32][..]);
989 // final_expiry_too_soon
990 if (msg.cltv_expiry as u64) < self.latest_block_height.load(Ordering::Acquire) as u64 + (CLTV_CLAIM_BUFFER + LATENCY_GRACE_PERIOD_BLOCKS) as u64 {
991 return_err!("The final CLTV expiry is too soon to handle", 17, &[0;0]);
993 // final_incorrect_htlc_amount
994 if next_hop_data.amt_to_forward > msg.amount_msat {
995 return_err!("Upstream node sent less than we were supposed to receive in payment", 19, &byte_utils::be64_to_array(msg.amount_msat));
997 // final_incorrect_cltv_expiry
998 if next_hop_data.outgoing_cltv_value != msg.cltv_expiry {
999 return_err!("Upstream node set CLTV to the wrong value", 18, &byte_utils::be32_to_array(msg.cltv_expiry));
1002 // Note that we could obviously respond immediately with an update_fulfill_htlc
1003 // message, however that would leak that we are the recipient of this payment, so
1004 // instead we stay symmetric with the forwarding case, only responding (after a
1005 // delay) once they've send us a commitment_signed!
1007 PendingHTLCStatus::Forward(PendingHTLCInfo {
1009 payment_hash: msg.payment_hash.clone(),
1010 short_channel_id: 0,
1011 incoming_shared_secret: shared_secret,
1012 amt_to_forward: next_hop_data.amt_to_forward,
1013 outgoing_cltv_value: next_hop_data.outgoing_cltv_value,
1016 let mut new_packet_data = [0; 20*65];
1017 let read_pos = chacha_stream.read(&mut new_packet_data).unwrap();
1018 #[cfg(debug_assertions)]
1020 // Check two things:
1021 // a) that the behavior of our stream here will return Ok(0) even if the TLV
1022 // read above emptied out our buffer and the unwrap() wont needlessly panic
1023 // b) that we didn't somehow magically end up with extra data.
1025 debug_assert!(chacha_stream.read(&mut t).unwrap() == 0);
1027 // Once we've emptied the set of bytes our peer gave us, encrypt 0 bytes until we
1028 // fill the onion hop data we'll forward to our next-hop peer.
1029 chacha_stream.chacha.process_in_place(&mut new_packet_data[read_pos..]);
1031 let mut new_pubkey = msg.onion_routing_packet.public_key.unwrap();
1033 let blinding_factor = {
1034 let mut sha = Sha256::engine();
1035 sha.input(&new_pubkey.serialize()[..]);
1036 sha.input(&shared_secret);
1037 Sha256::from_engine(sha).into_inner()
1040 let public_key = if let Err(e) = new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor[..]) {
1042 } else { Ok(new_pubkey) };
1044 let outgoing_packet = msgs::OnionPacket {
1047 hop_data: new_packet_data,
1048 hmac: next_hop_hmac.clone(),
1051 let short_channel_id = match next_hop_data.format {
1052 msgs::OnionHopDataFormat::Legacy { short_channel_id } => short_channel_id,
1053 msgs::OnionHopDataFormat::NonFinalNode { short_channel_id } => short_channel_id,
1054 msgs::OnionHopDataFormat::FinalNode => {
1055 return_err!("Final Node OnionHopData provided for us as an intermediary node", 0x4000 | 22, &[0;0]);
1059 PendingHTLCStatus::Forward(PendingHTLCInfo {
1060 onion_packet: Some(outgoing_packet),
1061 payment_hash: msg.payment_hash.clone(),
1062 short_channel_id: short_channel_id,
1063 incoming_shared_secret: shared_secret,
1064 amt_to_forward: next_hop_data.amt_to_forward,
1065 outgoing_cltv_value: next_hop_data.outgoing_cltv_value,
1069 channel_state = Some(self.channel_state.lock().unwrap());
1070 if let &PendingHTLCStatus::Forward(PendingHTLCInfo { ref onion_packet, ref short_channel_id, ref amt_to_forward, ref outgoing_cltv_value, .. }) = &pending_forward_info {
1071 if onion_packet.is_some() { // If short_channel_id is 0 here, we'll reject them in the body here
1072 let id_option = channel_state.as_ref().unwrap().short_to_id.get(&short_channel_id).cloned();
1073 let forwarding_id = match id_option {
1074 None => { // unknown_next_peer
1075 return_err!("Don't have available channel for forwarding as requested.", 0x4000 | 10, &[0;0]);
1077 Some(id) => id.clone(),
1079 if let Some((err, code, chan_update)) = loop {
1080 let chan = channel_state.as_mut().unwrap().by_id.get_mut(&forwarding_id).unwrap();
1082 // Note that we could technically not return an error yet here and just hope
1083 // that the connection is reestablished or monitor updated by the time we get
1084 // around to doing the actual forward, but better to fail early if we can and
1085 // hopefully an attacker trying to path-trace payments cannot make this occur
1086 // on a small/per-node/per-channel scale.
1087 if !chan.is_live() { // channel_disabled
1088 break Some(("Forwarding channel is not in a ready state.", 0x1000 | 20, Some(self.get_channel_update(chan).unwrap())));
1090 if *amt_to_forward < chan.get_their_htlc_minimum_msat() { // amount_below_minimum
1091 break Some(("HTLC amount was below the htlc_minimum_msat", 0x1000 | 11, Some(self.get_channel_update(chan).unwrap())));
1093 let fee = amt_to_forward.checked_mul(chan.get_fee_proportional_millionths() as u64).and_then(|prop_fee| { (prop_fee / 1000000).checked_add(chan.get_our_fee_base_msat(&self.fee_estimator) as u64) });
1094 if fee.is_none() || msg.amount_msat < fee.unwrap() || (msg.amount_msat - fee.unwrap()) < *amt_to_forward { // fee_insufficient
1095 break Some(("Prior hop has deviated from specified fees parameters or origin node has obsolete ones", 0x1000 | 12, Some(self.get_channel_update(chan).unwrap())));
1097 if (msg.cltv_expiry as u64) < (*outgoing_cltv_value) as u64 + CLTV_EXPIRY_DELTA as u64 { // incorrect_cltv_expiry
1098 break Some(("Forwarding node has tampered with the intended HTLC values or origin node has an obsolete cltv_expiry_delta", 0x1000 | 13, Some(self.get_channel_update(chan).unwrap())));
1100 let cur_height = self.latest_block_height.load(Ordering::Acquire) as u32 + 1;
1101 // We want to have at least LATENCY_GRACE_PERIOD_BLOCKS to fail prior to going on chain CLAIM_BUFFER blocks before expiration
1102 if msg.cltv_expiry <= cur_height + CLTV_CLAIM_BUFFER + LATENCY_GRACE_PERIOD_BLOCKS as u32 { // expiry_too_soon
1103 break Some(("CLTV expiry is too close", 0x1000 | 14, Some(self.get_channel_update(chan).unwrap())));
1105 if msg.cltv_expiry > cur_height + CLTV_FAR_FAR_AWAY as u32 { // expiry_too_far
1106 break Some(("CLTV expiry is too far in the future", 21, None));
1111 let mut res = Vec::with_capacity(8 + 128);
1112 if let Some(chan_update) = chan_update {
1113 if code == 0x1000 | 11 || code == 0x1000 | 12 {
1114 res.extend_from_slice(&byte_utils::be64_to_array(msg.amount_msat));
1116 else if code == 0x1000 | 13 {
1117 res.extend_from_slice(&byte_utils::be32_to_array(msg.cltv_expiry));
1119 else if code == 0x1000 | 20 {
1120 res.extend_from_slice(&byte_utils::be16_to_array(chan_update.contents.flags));
1122 res.extend_from_slice(&chan_update.encode_with_len()[..]);
1124 return_err!(err, code, &res[..]);
1129 (pending_forward_info, channel_state.unwrap())
1132 /// only fails if the channel does not yet have an assigned short_id
1133 /// May be called with channel_state already locked!
1134 fn get_channel_update(&self, chan: &Channel<ChanSigner>) -> Result<msgs::ChannelUpdate, LightningError> {
1135 let short_channel_id = match chan.get_short_channel_id() {
1136 None => return Err(LightningError{err: "Channel not yet established", action: msgs::ErrorAction::IgnoreError}),
1140 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).serialize()[..] < chan.get_their_node_id().serialize()[..];
1142 let unsigned = msgs::UnsignedChannelUpdate {
1143 chain_hash: self.genesis_hash,
1144 short_channel_id: short_channel_id,
1145 timestamp: chan.get_update_time_counter(),
1146 flags: (!were_node_one) as u16 | ((!chan.is_live() as u16) << 1),
1147 cltv_expiry_delta: CLTV_EXPIRY_DELTA,
1148 htlc_minimum_msat: chan.get_our_htlc_minimum_msat(),
1149 fee_base_msat: chan.get_our_fee_base_msat(&self.fee_estimator),
1150 fee_proportional_millionths: chan.get_fee_proportional_millionths(),
1151 excess_data: Vec::new(),
1154 let msg_hash = Sha256dHash::hash(&unsigned.encode()[..]);
1155 let sig = self.secp_ctx.sign(&hash_to_message!(&msg_hash[..]), &self.our_network_key);
1157 Ok(msgs::ChannelUpdate {
1163 /// Sends a payment along a given route.
1165 /// Value parameters are provided via the last hop in route, see documentation for RouteHop
1166 /// fields for more info.
1168 /// Note that if the payment_hash already exists elsewhere (eg you're sending a duplicative
1169 /// payment), we don't do anything to stop you! We always try to ensure that if the provided
1170 /// next hop knows the preimage to payment_hash they can claim an additional amount as
1171 /// specified in the last hop in the route! Thus, you should probably do your own
1172 /// payment_preimage tracking (which you should already be doing as they represent "proof of
1173 /// payment") and prevent double-sends yourself.
1175 /// May generate a SendHTLCs message event on success, which should be relayed.
1177 /// Raises APIError::RoutError when invalid route or forward parameter
1178 /// (cltv_delta, fee, node public key) is specified.
1179 /// Raises APIError::ChannelUnavailable if the next-hop channel is not available for updates
1180 /// (including due to previous monitor update failure or new permanent monitor update failure).
1181 /// Raised APIError::MonitorUpdateFailed if a new monitor update failure prevented sending the
1182 /// relevant updates.
1184 /// In case of APIError::RouteError/APIError::ChannelUnavailable, the payment send has failed
1185 /// and you may wish to retry via a different route immediately.
1186 /// In case of APIError::MonitorUpdateFailed, the commitment update has been irrevocably
1187 /// committed on our end and we're just waiting for a monitor update to send it. Do NOT retry
1188 /// the payment via a different route unless you intend to pay twice!
1189 pub fn send_payment(&self, route: Route, payment_hash: PaymentHash) -> Result<(), APIError> {
1190 if route.hops.len() < 1 || route.hops.len() > 20 {
1191 return Err(APIError::RouteError{err: "Route didn't go anywhere/had bogus size"});
1193 let our_node_id = self.get_our_node_id();
1194 for (idx, hop) in route.hops.iter().enumerate() {
1195 if idx != route.hops.len() - 1 && hop.pubkey == our_node_id {
1196 return Err(APIError::RouteError{err: "Route went through us but wasn't a simple rebalance loop to us"});
1200 let (session_priv, prng_seed) = self.keys_manager.get_onion_rand();
1202 let cur_height = self.latest_block_height.load(Ordering::Acquire) as u32 + 1;
1204 let onion_keys = secp_call!(onion_utils::construct_onion_keys(&self.secp_ctx, &route, &session_priv),
1205 APIError::RouteError{err: "Pubkey along hop was maliciously selected"});
1206 let (onion_payloads, htlc_msat, htlc_cltv) = onion_utils::build_onion_payloads(&route, cur_height)?;
1207 if onion_utils::route_size_insane(&onion_payloads) {
1208 return Err(APIError::RouteError{err: "Route size too large considering onion data"});
1210 let onion_packet = onion_utils::construct_onion_packet(onion_payloads, onion_keys, prng_seed, &payment_hash);
1212 let _ = self.total_consistency_lock.read().unwrap();
1214 let err: Result<(), _> = loop {
1215 let mut channel_lock = self.channel_state.lock().unwrap();
1216 let id = match channel_lock.short_to_id.get(&route.hops.first().unwrap().short_channel_id) {
1217 None => return Err(APIError::ChannelUnavailable{err: "No channel available with first hop!"}),
1218 Some(id) => id.clone(),
1221 let channel_state = &mut *channel_lock;
1222 if let hash_map::Entry::Occupied(mut chan) = channel_state.by_id.entry(id) {
1224 if chan.get().get_their_node_id() != route.hops.first().unwrap().pubkey {
1225 return Err(APIError::RouteError{err: "Node ID mismatch on first hop!"});
1227 if !chan.get().is_live() {
1228 return Err(APIError::ChannelUnavailable{err: "Peer for first hop currently disconnected/pending monitor update!"});
1230 break_chan_entry!(self, chan.get_mut().send_htlc_and_commit(htlc_msat, payment_hash.clone(), htlc_cltv, HTLCSource::OutboundRoute {
1231 route: route.clone(),
1232 session_priv: session_priv.clone(),
1233 first_hop_htlc_msat: htlc_msat,
1234 }, onion_packet), channel_state, chan)
1236 Some((update_add, commitment_signed, monitor_update)) => {
1237 if let Err(e) = self.monitor.update_monitor(chan.get().get_funding_txo().unwrap(), monitor_update) {
1238 maybe_break_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::CommitmentFirst, false, true);
1239 // Note that MonitorUpdateFailed here indicates (per function docs)
1240 // that we will resent the commitment update once we unfree monitor
1241 // updating, so we have to take special care that we don't return
1242 // something else in case we will resend later!
1243 return Err(APIError::MonitorUpdateFailed);
1246 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
1247 node_id: route.hops.first().unwrap().pubkey,
1248 updates: msgs::CommitmentUpdate {
1249 update_add_htlcs: vec![update_add],
1250 update_fulfill_htlcs: Vec::new(),
1251 update_fail_htlcs: Vec::new(),
1252 update_fail_malformed_htlcs: Vec::new(),
1260 } else { unreachable!(); }
1264 match handle_error!(self, err, route.hops.first().unwrap().pubkey) {
1265 Ok(_) => unreachable!(),
1266 Err(e) => { Err(APIError::ChannelUnavailable { err: e.err }) }
1270 /// Call this upon creation of a funding transaction for the given channel.
1272 /// Note that ALL inputs in the transaction pointed to by funding_txo MUST spend SegWit outputs
1273 /// or your counterparty can steal your funds!
1275 /// Panics if a funding transaction has already been provided for this channel.
1277 /// May panic if the funding_txo is duplicative with some other channel (note that this should
1278 /// be trivially prevented by using unique funding transaction keys per-channel).
1279 pub fn funding_transaction_generated(&self, temporary_channel_id: &[u8; 32], funding_txo: OutPoint) {
1280 let _ = self.total_consistency_lock.read().unwrap();
1282 let (mut chan, msg, chan_monitor) = {
1283 let (res, chan) = match self.channel_state.lock().unwrap().by_id.remove(temporary_channel_id) {
1285 (chan.get_outbound_funding_created(funding_txo)
1286 .map_err(|e| if let ChannelError::Close(msg) = e {
1287 MsgHandleErrInternal::from_finish_shutdown(msg, chan.channel_id(), chan.force_shutdown(true), None)
1288 } else { unreachable!(); })
1293 match handle_error!(self, res, chan.get_their_node_id()) {
1294 Ok(funding_msg) => {
1295 (chan, funding_msg.0, funding_msg.1)
1297 Err(_) => { return; }
1300 // Because we have exclusive ownership of the channel here we can release the channel_state
1301 // lock before add_monitor
1302 if let Err(e) = self.monitor.add_monitor(chan_monitor.get_funding_txo().unwrap(), chan_monitor) {
1304 ChannelMonitorUpdateErr::PermanentFailure => {
1305 match handle_error!(self, Err(MsgHandleErrInternal::from_finish_shutdown("ChannelMonitor storage failure", *temporary_channel_id, chan.force_shutdown(true), None)), chan.get_their_node_id()) {
1306 Err(_) => { return; },
1307 Ok(()) => unreachable!(),
1310 ChannelMonitorUpdateErr::TemporaryFailure => {
1311 // Its completely fine to continue with a FundingCreated until the monitor
1312 // update is persisted, as long as we don't generate the FundingBroadcastSafe
1313 // until the monitor has been safely persisted (as funding broadcast is not,
1315 chan.monitor_update_failed(false, false, Vec::new(), Vec::new());
1320 let mut channel_state = self.channel_state.lock().unwrap();
1321 channel_state.pending_msg_events.push(events::MessageSendEvent::SendFundingCreated {
1322 node_id: chan.get_their_node_id(),
1325 match channel_state.by_id.entry(chan.channel_id()) {
1326 hash_map::Entry::Occupied(_) => {
1327 panic!("Generated duplicate funding txid?");
1329 hash_map::Entry::Vacant(e) => {
1335 fn get_announcement_sigs(&self, chan: &Channel<ChanSigner>) -> Option<msgs::AnnouncementSignatures> {
1336 if !chan.should_announce() {
1337 log_trace!(self, "Can't send announcement_signatures for private channel {}", log_bytes!(chan.channel_id()));
1341 let (announcement, our_bitcoin_sig) = match chan.get_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone()) {
1343 Err(_) => return None, // Only in case of state precondition violations eg channel is closing
1345 let msghash = hash_to_message!(&Sha256dHash::hash(&announcement.encode()[..])[..]);
1346 let our_node_sig = self.secp_ctx.sign(&msghash, &self.our_network_key);
1348 Some(msgs::AnnouncementSignatures {
1349 channel_id: chan.channel_id(),
1350 short_channel_id: chan.get_short_channel_id().unwrap(),
1351 node_signature: our_node_sig,
1352 bitcoin_signature: our_bitcoin_sig,
1357 // Messages of up to 64KB should never end up more than half full with addresses, as that would
1358 // be absurd. We ensure this by checking that at least 500 (our stated public contract on when
1359 // broadcast_node_announcement panics) of the maximum-length addresses would fit in a 64KB
1361 const HALF_MESSAGE_IS_ADDRS: u32 = ::std::u16::MAX as u32 / (msgs::NetAddress::MAX_LEN as u32 + 1) / 2;
1364 // ...by failing to compile if the number of addresses that would be half of a message is
1365 // smaller than 500:
1366 const STATIC_ASSERT: u32 = Self::HALF_MESSAGE_IS_ADDRS - 500;
1368 /// Generates a signed node_announcement from the given arguments and creates a
1369 /// BroadcastNodeAnnouncement event. Note that such messages will be ignored unless peers have
1370 /// seen a channel_announcement from us (ie unless we have public channels open).
1372 /// RGB is a node "color" and alias is a printable human-readable string to describe this node
1373 /// to humans. They carry no in-protocol meaning.
1375 /// addresses represent the set (possibly empty) of socket addresses on which this node accepts
1376 /// incoming connections. These will be broadcast to the network, publicly tying these
1377 /// addresses together. If you wish to preserve user privacy, addresses should likely contain
1378 /// only Tor Onion addresses.
1380 /// Panics if addresses is absurdly large (more than 500).
1381 pub fn broadcast_node_announcement(&self, rgb: [u8; 3], alias: [u8; 32], addresses: Vec<msgs::NetAddress>) {
1382 let _ = self.total_consistency_lock.read().unwrap();
1384 if addresses.len() > 500 {
1385 panic!("More than half the message size was taken up by public addresses!");
1388 let announcement = msgs::UnsignedNodeAnnouncement {
1389 features: NodeFeatures::supported(),
1390 timestamp: self.last_node_announcement_serial.fetch_add(1, Ordering::AcqRel) as u32,
1391 node_id: self.get_our_node_id(),
1392 rgb, alias, addresses,
1393 excess_address_data: Vec::new(),
1394 excess_data: Vec::new(),
1396 let msghash = hash_to_message!(&Sha256dHash::hash(&announcement.encode()[..])[..]);
1398 let mut channel_state = self.channel_state.lock().unwrap();
1399 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastNodeAnnouncement {
1400 msg: msgs::NodeAnnouncement {
1401 signature: self.secp_ctx.sign(&msghash, &self.our_network_key),
1402 contents: announcement
1407 /// Processes HTLCs which are pending waiting on random forward delay.
1409 /// Should only really ever be called in response to a PendingHTLCsForwardable event.
1410 /// Will likely generate further events.
1411 pub fn process_pending_htlc_forwards(&self) {
1412 let _ = self.total_consistency_lock.read().unwrap();
1414 let mut new_events = Vec::new();
1415 let mut failed_forwards = Vec::new();
1416 let mut handle_errors = Vec::new();
1418 let mut channel_state_lock = self.channel_state.lock().unwrap();
1419 let channel_state = &mut *channel_state_lock;
1421 for (short_chan_id, mut pending_forwards) in channel_state.forward_htlcs.drain() {
1422 if short_chan_id != 0 {
1423 let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
1424 Some(chan_id) => chan_id.clone(),
1426 failed_forwards.reserve(pending_forwards.len());
1427 for forward_info in pending_forwards.drain(..) {
1428 match forward_info {
1429 HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info } => {
1430 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
1431 short_channel_id: prev_short_channel_id,
1432 htlc_id: prev_htlc_id,
1433 incoming_packet_shared_secret: forward_info.incoming_shared_secret,
1435 failed_forwards.push((htlc_source, forward_info.payment_hash, 0x4000 | 10, None));
1437 HTLCForwardInfo::FailHTLC { .. } => {
1438 // Channel went away before we could fail it. This implies
1439 // the channel is now on chain and our counterparty is
1440 // trying to broadcast the HTLC-Timeout, but that's their
1441 // problem, not ours.
1448 if let hash_map::Entry::Occupied(mut chan) = channel_state.by_id.entry(forward_chan_id) {
1449 let mut add_htlc_msgs = Vec::new();
1450 let mut fail_htlc_msgs = Vec::new();
1451 for forward_info in pending_forwards.drain(..) {
1452 match forward_info {
1453 HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info } => {
1454 log_trace!(self, "Adding HTLC from short id {} with payment_hash {} to channel with short id {} after delay", log_bytes!(forward_info.payment_hash.0), prev_short_channel_id, short_chan_id);
1455 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
1456 short_channel_id: prev_short_channel_id,
1457 htlc_id: prev_htlc_id,
1458 incoming_packet_shared_secret: forward_info.incoming_shared_secret,
1460 match chan.get_mut().send_htlc(forward_info.amt_to_forward, forward_info.payment_hash, forward_info.outgoing_cltv_value, htlc_source.clone(), forward_info.onion_packet.unwrap()) {
1462 if let ChannelError::Ignore(msg) = e {
1463 log_trace!(self, "Failed to forward HTLC with payment_hash {}: {}", log_bytes!(forward_info.payment_hash.0), msg);
1465 panic!("Stated return value requirements in send_htlc() were not met");
1467 let chan_update = self.get_channel_update(chan.get()).unwrap();
1468 failed_forwards.push((htlc_source, forward_info.payment_hash, 0x1000 | 7, Some(chan_update)));
1473 Some(msg) => { add_htlc_msgs.push(msg); },
1475 // Nothing to do here...we're waiting on a remote
1476 // revoke_and_ack before we can add anymore HTLCs. The Channel
1477 // will automatically handle building the update_add_htlc and
1478 // commitment_signed messages when we can.
1479 // TODO: Do some kind of timer to set the channel as !is_live()
1480 // as we don't really want others relying on us relaying through
1481 // this channel currently :/.
1487 HTLCForwardInfo::FailHTLC { htlc_id, err_packet } => {
1488 log_trace!(self, "Failing HTLC back to channel with short id {} after delay", short_chan_id);
1489 match chan.get_mut().get_update_fail_htlc(htlc_id, err_packet) {
1491 if let ChannelError::Ignore(msg) = e {
1492 log_trace!(self, "Failed to fail backwards to short_id {}: {}", short_chan_id, msg);
1494 panic!("Stated return value requirements in get_update_fail_htlc() were not met");
1496 // fail-backs are best-effort, we probably already have one
1497 // pending, and if not that's OK, if not, the channel is on
1498 // the chain and sending the HTLC-Timeout is their problem.
1501 Ok(Some(msg)) => { fail_htlc_msgs.push(msg); },
1503 // Nothing to do here...we're waiting on a remote
1504 // revoke_and_ack before we can update the commitment
1505 // transaction. The Channel will automatically handle
1506 // building the update_fail_htlc and commitment_signed
1507 // messages when we can.
1508 // We don't need any kind of timer here as they should fail
1509 // the channel onto the chain if they can't get our
1510 // update_fail_htlc in time, it's not our problem.
1517 if !add_htlc_msgs.is_empty() || !fail_htlc_msgs.is_empty() {
1518 let (commitment_msg, monitor_update) = match chan.get_mut().send_commitment() {
1521 // We surely failed send_commitment due to bad keys, in that case
1522 // close channel and then send error message to peer.
1523 let their_node_id = chan.get().get_their_node_id();
1524 let err: Result<(), _> = match e {
1525 ChannelError::Ignore(_) => {
1526 panic!("Stated return value requirements in send_commitment() were not met");
1528 ChannelError::Close(msg) => {
1529 log_trace!(self, "Closing channel {} due to Close-required error: {}", log_bytes!(chan.key()[..]), msg);
1530 let (channel_id, mut channel) = chan.remove_entry();
1531 if let Some(short_id) = channel.get_short_channel_id() {
1532 channel_state.short_to_id.remove(&short_id);
1534 Err(MsgHandleErrInternal::from_finish_shutdown(msg, channel_id, channel.force_shutdown(true), self.get_channel_update(&channel).ok()))
1536 ChannelError::CloseDelayBroadcast { .. } => { panic!("Wait is only generated on receipt of channel_reestablish, which is handled by try_chan_entry, we don't bother to support it here"); }
1538 handle_errors.push((their_node_id, err));
1542 if let Err(e) = self.monitor.update_monitor(chan.get().get_funding_txo().unwrap(), monitor_update) {
1543 handle_errors.push((chan.get().get_their_node_id(), handle_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::CommitmentFirst, false, true)));
1546 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
1547 node_id: chan.get().get_their_node_id(),
1548 updates: msgs::CommitmentUpdate {
1549 update_add_htlcs: add_htlc_msgs,
1550 update_fulfill_htlcs: Vec::new(),
1551 update_fail_htlcs: fail_htlc_msgs,
1552 update_fail_malformed_htlcs: Vec::new(),
1554 commitment_signed: commitment_msg,
1562 for forward_info in pending_forwards.drain(..) {
1563 match forward_info {
1564 HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info } => {
1565 let prev_hop_data = HTLCPreviousHopData {
1566 short_channel_id: prev_short_channel_id,
1567 htlc_id: prev_htlc_id,
1568 incoming_packet_shared_secret: forward_info.incoming_shared_secret,
1570 match channel_state.claimable_htlcs.entry(forward_info.payment_hash) {
1571 hash_map::Entry::Occupied(mut entry) => entry.get_mut().push((forward_info.amt_to_forward, prev_hop_data)),
1572 hash_map::Entry::Vacant(entry) => { entry.insert(vec![(forward_info.amt_to_forward, prev_hop_data)]); },
1574 new_events.push(events::Event::PaymentReceived {
1575 payment_hash: forward_info.payment_hash,
1576 amt: forward_info.amt_to_forward,
1579 HTLCForwardInfo::FailHTLC { .. } => {
1580 panic!("Got pending fail of our own HTLC");
1588 for (htlc_source, payment_hash, failure_code, update) in failed_forwards.drain(..) {
1590 None => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source, &payment_hash, HTLCFailReason::Reason { failure_code, data: Vec::new() }),
1591 Some(chan_update) => self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source, &payment_hash, HTLCFailReason::Reason { failure_code, data: chan_update.encode_with_len() }),
1595 for (their_node_id, err) in handle_errors.drain(..) {
1596 let _ = handle_error!(self, err, their_node_id);
1599 if new_events.is_empty() { return }
1600 let mut events = self.pending_events.lock().unwrap();
1601 events.append(&mut new_events);
1604 /// If a peer is disconnected we mark any channels with that peer as 'disabled'.
1605 /// After some time, if channels are still disabled we need to broadcast a ChannelUpdate
1606 /// to inform the network about the uselessness of these channels.
1608 /// This method handles all the details, and must be called roughly once per minute.
1609 pub fn timer_chan_freshness_every_min(&self) {
1610 let _ = self.total_consistency_lock.read().unwrap();
1611 let mut channel_state_lock = self.channel_state.lock().unwrap();
1612 let channel_state = &mut *channel_state_lock;
1613 for (_, chan) in channel_state.by_id.iter_mut() {
1614 if chan.is_disabled_staged() && !chan.is_live() {
1615 if let Ok(update) = self.get_channel_update(&chan) {
1616 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
1621 } else if chan.is_disabled_staged() && chan.is_live() {
1623 } else if chan.is_disabled_marked() {
1624 chan.to_disabled_staged();
1629 /// Indicates that the preimage for payment_hash is unknown or the received amount is incorrect
1630 /// after a PaymentReceived event, failing the HTLC back to its origin and freeing resources
1631 /// along the path (including in our own channel on which we received it).
1632 /// Returns false if no payment was found to fail backwards, true if the process of failing the
1633 /// HTLC backwards has been started.
1634 pub fn fail_htlc_backwards(&self, payment_hash: &PaymentHash) -> bool {
1635 let _ = self.total_consistency_lock.read().unwrap();
1637 let mut channel_state = Some(self.channel_state.lock().unwrap());
1638 let removed_source = channel_state.as_mut().unwrap().claimable_htlcs.remove(payment_hash);
1639 if let Some(mut sources) = removed_source {
1640 for (recvd_value, htlc_with_hash) in sources.drain(..) {
1641 if channel_state.is_none() { channel_state = Some(self.channel_state.lock().unwrap()); }
1642 self.fail_htlc_backwards_internal(channel_state.take().unwrap(),
1643 HTLCSource::PreviousHopData(htlc_with_hash), payment_hash,
1644 HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: byte_utils::be64_to_array(recvd_value).to_vec() });
1650 /// Fails an HTLC backwards to the sender of it to us.
1651 /// Note that while we take a channel_state lock as input, we do *not* assume consistency here.
1652 /// There are several callsites that do stupid things like loop over a list of payment_hashes
1653 /// to fail and take the channel_state lock for each iteration (as we take ownership and may
1654 /// drop it). In other words, no assumptions are made that entries in claimable_htlcs point to
1655 /// still-available channels.
1656 fn fail_htlc_backwards_internal(&self, mut channel_state_lock: MutexGuard<ChannelHolder<ChanSigner>>, source: HTLCSource, payment_hash: &PaymentHash, onion_error: HTLCFailReason) {
1657 //TODO: There is a timing attack here where if a node fails an HTLC back to us they can
1658 //identify whether we sent it or not based on the (I presume) very different runtime
1659 //between the branches here. We should make this async and move it into the forward HTLCs
1662 HTLCSource::OutboundRoute { ref route, .. } => {
1663 log_trace!(self, "Failing outbound payment HTLC with payment_hash {}", log_bytes!(payment_hash.0));
1664 mem::drop(channel_state_lock);
1665 match &onion_error {
1666 &HTLCFailReason::LightningError { ref err } => {
1668 let (channel_update, payment_retryable, onion_error_code) = onion_utils::process_onion_failure(&self.secp_ctx, &self.logger, &source, err.data.clone());
1670 let (channel_update, payment_retryable, _) = onion_utils::process_onion_failure(&self.secp_ctx, &self.logger, &source, err.data.clone());
1671 // TODO: If we decided to blame ourselves (or one of our channels) in
1672 // process_onion_failure we should close that channel as it implies our
1673 // next-hop is needlessly blaming us!
1674 if let Some(update) = channel_update {
1675 self.channel_state.lock().unwrap().pending_msg_events.push(
1676 events::MessageSendEvent::PaymentFailureNetworkUpdate {
1681 self.pending_events.lock().unwrap().push(
1682 events::Event::PaymentFailed {
1683 payment_hash: payment_hash.clone(),
1684 rejected_by_dest: !payment_retryable,
1686 error_code: onion_error_code
1690 &HTLCFailReason::Reason {
1694 // we get a fail_malformed_htlc from the first hop
1695 // TODO: We'd like to generate a PaymentFailureNetworkUpdate for temporary
1696 // failures here, but that would be insufficient as Router::get_route
1697 // generally ignores its view of our own channels as we provide them via
1699 // TODO: For non-temporary failures, we really should be closing the
1700 // channel here as we apparently can't relay through them anyway.
1701 self.pending_events.lock().unwrap().push(
1702 events::Event::PaymentFailed {
1703 payment_hash: payment_hash.clone(),
1704 rejected_by_dest: route.hops.len() == 1,
1706 error_code: Some(*failure_code),
1712 HTLCSource::PreviousHopData(HTLCPreviousHopData { short_channel_id, htlc_id, incoming_packet_shared_secret }) => {
1713 let err_packet = match onion_error {
1714 HTLCFailReason::Reason { failure_code, data } => {
1715 log_trace!(self, "Failing HTLC with payment_hash {} backwards from us with code {}", log_bytes!(payment_hash.0), failure_code);
1716 let packet = onion_utils::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
1717 onion_utils::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
1719 HTLCFailReason::LightningError { err } => {
1720 log_trace!(self, "Failing HTLC with payment_hash {} backwards with pre-built LightningError", log_bytes!(payment_hash.0));
1721 onion_utils::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
1725 let mut forward_event = None;
1726 if channel_state_lock.forward_htlcs.is_empty() {
1727 forward_event = Some(Duration::from_millis(MIN_HTLC_RELAY_HOLDING_CELL_MILLIS));
1729 match channel_state_lock.forward_htlcs.entry(short_channel_id) {
1730 hash_map::Entry::Occupied(mut entry) => {
1731 entry.get_mut().push(HTLCForwardInfo::FailHTLC { htlc_id, err_packet });
1733 hash_map::Entry::Vacant(entry) => {
1734 entry.insert(vec!(HTLCForwardInfo::FailHTLC { htlc_id, err_packet }));
1737 mem::drop(channel_state_lock);
1738 if let Some(time) = forward_event {
1739 let mut pending_events = self.pending_events.lock().unwrap();
1740 pending_events.push(events::Event::PendingHTLCsForwardable {
1741 time_forwardable: time
1748 /// Provides a payment preimage in response to a PaymentReceived event, returning true and
1749 /// generating message events for the net layer to claim the payment, if possible. Thus, you
1750 /// should probably kick the net layer to go send messages if this returns true!
1752 /// You must specify the expected amounts for this HTLC, and we will only claim HTLCs
1753 /// available within a few percent of the expected amount. This is critical for several
1754 /// reasons : a) it avoids providing senders with `proof-of-payment` (in the form of the
1755 /// payment_preimage without having provided the full value and b) it avoids certain
1756 /// privacy-breaking recipient-probing attacks which may reveal payment activity to
1757 /// motivated attackers.
1759 /// May panic if called except in response to a PaymentReceived event.
1760 pub fn claim_funds(&self, payment_preimage: PaymentPreimage, expected_amount: u64) -> bool {
1761 let payment_hash = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
1763 let _ = self.total_consistency_lock.read().unwrap();
1765 let mut channel_state = Some(self.channel_state.lock().unwrap());
1766 let removed_source = channel_state.as_mut().unwrap().claimable_htlcs.remove(&payment_hash);
1767 if let Some(mut sources) = removed_source {
1768 for (received_amount, htlc_with_hash) in sources.drain(..) {
1769 if channel_state.is_none() { channel_state = Some(self.channel_state.lock().unwrap()); }
1770 if received_amount < expected_amount || received_amount > expected_amount * 2 {
1771 let mut htlc_msat_data = byte_utils::be64_to_array(received_amount).to_vec();
1772 let mut height_data = byte_utils::be32_to_array(self.latest_block_height.load(Ordering::Acquire) as u32).to_vec();
1773 htlc_msat_data.append(&mut height_data);
1774 self.fail_htlc_backwards_internal(channel_state.take().unwrap(),
1775 HTLCSource::PreviousHopData(htlc_with_hash), &payment_hash,
1776 HTLCFailReason::Reason { failure_code: 0x4000|15, data: htlc_msat_data });
1778 self.claim_funds_internal(channel_state.take().unwrap(), HTLCSource::PreviousHopData(htlc_with_hash), payment_preimage);
1784 fn claim_funds_internal(&self, mut channel_state_lock: MutexGuard<ChannelHolder<ChanSigner>>, source: HTLCSource, payment_preimage: PaymentPreimage) {
1785 let (their_node_id, err) = loop {
1787 HTLCSource::OutboundRoute { .. } => {
1788 mem::drop(channel_state_lock);
1789 let mut pending_events = self.pending_events.lock().unwrap();
1790 pending_events.push(events::Event::PaymentSent {
1794 HTLCSource::PreviousHopData(HTLCPreviousHopData { short_channel_id, htlc_id, .. }) => {
1795 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
1796 let channel_state = &mut *channel_state_lock;
1798 let chan_id = match channel_state.short_to_id.get(&short_channel_id) {
1799 Some(chan_id) => chan_id.clone(),
1801 // TODO: There is probably a channel manager somewhere that needs to
1802 // learn the preimage as the channel already hit the chain and that's
1803 // why it's missing.
1808 if let hash_map::Entry::Occupied(mut chan) = channel_state.by_id.entry(chan_id) {
1809 let was_frozen_for_monitor = chan.get().is_awaiting_monitor_update();
1810 match chan.get_mut().get_update_fulfill_htlc_and_commit(htlc_id, payment_preimage) {
1811 Ok((msgs, monitor_option)) => {
1812 if let Some(monitor_update) = monitor_option {
1813 if let Err(e) = self.monitor.update_monitor(chan.get().get_funding_txo().unwrap(), monitor_update) {
1814 if was_frozen_for_monitor {
1815 assert!(msgs.is_none());
1817 break (chan.get().get_their_node_id(), handle_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::CommitmentFirst, false, msgs.is_some()));
1821 if let Some((msg, commitment_signed)) = msgs {
1822 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
1823 node_id: chan.get().get_their_node_id(),
1824 updates: msgs::CommitmentUpdate {
1825 update_add_htlcs: Vec::new(),
1826 update_fulfill_htlcs: vec![msg],
1827 update_fail_htlcs: Vec::new(),
1828 update_fail_malformed_htlcs: Vec::new(),
1836 // TODO: There is probably a channel manager somewhere that needs to
1837 // learn the preimage as the channel may be about to hit the chain.
1838 //TODO: Do something with e?
1842 } else { unreachable!(); }
1848 mem::drop(channel_state_lock);
1849 let _ = handle_error!(self, err, their_node_id);
1852 /// Gets the node_id held by this ChannelManager
1853 pub fn get_our_node_id(&self) -> PublicKey {
1854 PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key)
1857 /// Restores a single, given channel to normal operation after a
1858 /// ChannelMonitorUpdateErr::TemporaryFailure was returned from a channel monitor update
1861 /// All ChannelMonitor updates up to and including highest_applied_update_id must have been
1862 /// fully committed in every copy of the given channels' ChannelMonitors.
1864 /// Note that there is no effect to calling with a highest_applied_update_id other than the
1865 /// current latest ChannelMonitorUpdate and one call to this function after multiple
1866 /// ChannelMonitorUpdateErr::TemporaryFailures is fine. The highest_applied_update_id field
1867 /// exists largely only to prevent races between this and concurrent update_monitor calls.
1869 /// Thus, the anticipated use is, at a high level:
1870 /// 1) You register a ManyChannelMonitor with this ChannelManager,
1871 /// 2) it stores each update to disk, and begins updating any remote (eg watchtower) copies of
1872 /// said ChannelMonitors as it can, returning ChannelMonitorUpdateErr::TemporaryFailures
1873 /// any time it cannot do so instantly,
1874 /// 3) update(s) are applied to each remote copy of a ChannelMonitor,
1875 /// 4) once all remote copies are updated, you call this function with the update_id that
1876 /// completed, and once it is the latest the Channel will be re-enabled.
1877 pub fn channel_monitor_updated(&self, funding_txo: &OutPoint, highest_applied_update_id: u64) {
1878 let _ = self.total_consistency_lock.read().unwrap();
1880 let mut close_results = Vec::new();
1881 let mut htlc_forwards = Vec::new();
1882 let mut htlc_failures = Vec::new();
1883 let mut pending_events = Vec::new();
1886 let mut channel_lock = self.channel_state.lock().unwrap();
1887 let channel_state = &mut *channel_lock;
1888 let short_to_id = &mut channel_state.short_to_id;
1889 let pending_msg_events = &mut channel_state.pending_msg_events;
1890 let channel = match channel_state.by_id.get_mut(&funding_txo.to_channel_id()) {
1894 if !channel.is_awaiting_monitor_update() || channel.get_latest_monitor_update_id() != highest_applied_update_id {
1898 let (raa, commitment_update, order, pending_forwards, mut pending_failures, needs_broadcast_safe, funding_locked) = channel.monitor_updating_restored();
1899 if !pending_forwards.is_empty() {
1900 htlc_forwards.push((channel.get_short_channel_id().expect("We can't have pending forwards before funding confirmation"), pending_forwards));
1902 htlc_failures.append(&mut pending_failures);
1904 macro_rules! handle_cs { () => {
1905 if let Some(update) = commitment_update {
1906 pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
1907 node_id: channel.get_their_node_id(),
1912 macro_rules! handle_raa { () => {
1913 if let Some(revoke_and_ack) = raa {
1914 pending_msg_events.push(events::MessageSendEvent::SendRevokeAndACK {
1915 node_id: channel.get_their_node_id(),
1916 msg: revoke_and_ack,
1921 RAACommitmentOrder::CommitmentFirst => {
1925 RAACommitmentOrder::RevokeAndACKFirst => {
1930 if needs_broadcast_safe {
1931 pending_events.push(events::Event::FundingBroadcastSafe {
1932 funding_txo: channel.get_funding_txo().unwrap(),
1933 user_channel_id: channel.get_user_id(),
1936 if let Some(msg) = funding_locked {
1937 pending_msg_events.push(events::MessageSendEvent::SendFundingLocked {
1938 node_id: channel.get_their_node_id(),
1941 if let Some(announcement_sigs) = self.get_announcement_sigs(channel) {
1942 pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
1943 node_id: channel.get_their_node_id(),
1944 msg: announcement_sigs,
1947 short_to_id.insert(channel.get_short_channel_id().unwrap(), channel.channel_id());
1951 self.pending_events.lock().unwrap().append(&mut pending_events);
1953 for failure in htlc_failures.drain(..) {
1954 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), failure.0, &failure.1, failure.2);
1956 self.forward_htlcs(&mut htlc_forwards[..]);
1958 for res in close_results.drain(..) {
1959 self.finish_force_close_channel(res);
1963 fn internal_open_channel(&self, their_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::OpenChannel) -> Result<(), MsgHandleErrInternal> {
1964 if msg.chain_hash != self.genesis_hash {
1965 return Err(MsgHandleErrInternal::send_err_msg_no_close("Unknown genesis block hash", msg.temporary_channel_id.clone()));
1968 let channel = Channel::new_from_req(&self.fee_estimator, &self.keys_manager, their_node_id.clone(), their_features, msg, 0, Arc::clone(&self.logger), &self.default_configuration)
1969 .map_err(|e| MsgHandleErrInternal::from_chan_no_close(e, msg.temporary_channel_id))?;
1970 let mut channel_state_lock = self.channel_state.lock().unwrap();
1971 let channel_state = &mut *channel_state_lock;
1972 match channel_state.by_id.entry(channel.channel_id()) {
1973 hash_map::Entry::Occupied(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("temporary_channel_id collision!", msg.temporary_channel_id.clone())),
1974 hash_map::Entry::Vacant(entry) => {
1975 channel_state.pending_msg_events.push(events::MessageSendEvent::SendAcceptChannel {
1976 node_id: their_node_id.clone(),
1977 msg: channel.get_accept_channel(),
1979 entry.insert(channel);
1985 fn internal_accept_channel(&self, their_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::AcceptChannel) -> Result<(), MsgHandleErrInternal> {
1986 let (value, output_script, user_id) = {
1987 let mut channel_lock = self.channel_state.lock().unwrap();
1988 let channel_state = &mut *channel_lock;
1989 match channel_state.by_id.entry(msg.temporary_channel_id) {
1990 hash_map::Entry::Occupied(mut chan) => {
1991 if chan.get().get_their_node_id() != *their_node_id {
1992 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.temporary_channel_id));
1994 try_chan_entry!(self, chan.get_mut().accept_channel(&msg, &self.default_configuration, their_features), channel_state, chan);
1995 (chan.get().get_value_satoshis(), chan.get().get_funding_redeemscript().to_v0_p2wsh(), chan.get().get_user_id())
1997 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.temporary_channel_id))
2000 let mut pending_events = self.pending_events.lock().unwrap();
2001 pending_events.push(events::Event::FundingGenerationReady {
2002 temporary_channel_id: msg.temporary_channel_id,
2003 channel_value_satoshis: value,
2004 output_script: output_script,
2005 user_channel_id: user_id,
2010 fn internal_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<(), MsgHandleErrInternal> {
2011 let ((funding_msg, monitor_update), mut chan) = {
2012 let mut channel_lock = self.channel_state.lock().unwrap();
2013 let channel_state = &mut *channel_lock;
2014 match channel_state.by_id.entry(msg.temporary_channel_id.clone()) {
2015 hash_map::Entry::Occupied(mut chan) => {
2016 if chan.get().get_their_node_id() != *their_node_id {
2017 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.temporary_channel_id));
2019 (try_chan_entry!(self, chan.get_mut().funding_created(msg), channel_state, chan), chan.remove())
2021 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.temporary_channel_id))
2024 // Because we have exclusive ownership of the channel here we can release the channel_state
2025 // lock before add_monitor
2026 if let Err(e) = self.monitor.add_monitor(monitor_update.get_funding_txo().unwrap(), monitor_update) {
2028 ChannelMonitorUpdateErr::PermanentFailure => {
2029 // Note that we reply with the new channel_id in error messages if we gave up on the
2030 // channel, not the temporary_channel_id. This is compatible with ourselves, but the
2031 // spec is somewhat ambiguous here. Not a huge deal since we'll send error messages for
2032 // any messages referencing a previously-closed channel anyway.
2033 return Err(MsgHandleErrInternal::from_finish_shutdown("ChannelMonitor storage failure", funding_msg.channel_id, chan.force_shutdown(true), None));
2035 ChannelMonitorUpdateErr::TemporaryFailure => {
2036 // There's no problem signing a counterparty's funding transaction if our monitor
2037 // hasn't persisted to disk yet - we can't lose money on a transaction that we haven't
2038 // accepted payment from yet. We do, however, need to wait to send our funding_locked
2039 // until we have persisted our monitor.
2040 chan.monitor_update_failed(false, false, Vec::new(), Vec::new());
2044 let mut channel_state_lock = self.channel_state.lock().unwrap();
2045 let channel_state = &mut *channel_state_lock;
2046 match channel_state.by_id.entry(funding_msg.channel_id) {
2047 hash_map::Entry::Occupied(_) => {
2048 return Err(MsgHandleErrInternal::send_err_msg_no_close("Already had channel with the new channel_id", funding_msg.channel_id))
2050 hash_map::Entry::Vacant(e) => {
2051 channel_state.pending_msg_events.push(events::MessageSendEvent::SendFundingSigned {
2052 node_id: their_node_id.clone(),
2061 fn internal_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), MsgHandleErrInternal> {
2062 let (funding_txo, user_id) = {
2063 let mut channel_lock = self.channel_state.lock().unwrap();
2064 let channel_state = &mut *channel_lock;
2065 match channel_state.by_id.entry(msg.channel_id) {
2066 hash_map::Entry::Occupied(mut chan) => {
2067 if chan.get().get_their_node_id() != *their_node_id {
2068 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2070 let monitor_update = match chan.get_mut().funding_signed(&msg) {
2071 Err((None, e)) => try_chan_entry!(self, Err(e), channel_state, chan),
2072 Err((Some(monitor_update), e)) => {
2073 assert!(chan.get().is_awaiting_monitor_update());
2074 let _ = self.monitor.update_monitor(chan.get().get_funding_txo().unwrap(), monitor_update);
2075 try_chan_entry!(self, Err(e), channel_state, chan);
2078 Ok(update) => update,
2080 if let Err(e) = self.monitor.update_monitor(chan.get().get_funding_txo().unwrap(), monitor_update) {
2081 return_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::RevokeAndACKFirst, false, false);
2083 (chan.get().get_funding_txo().unwrap(), chan.get().get_user_id())
2085 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2088 let mut pending_events = self.pending_events.lock().unwrap();
2089 pending_events.push(events::Event::FundingBroadcastSafe {
2090 funding_txo: funding_txo,
2091 user_channel_id: user_id,
2096 fn internal_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<(), MsgHandleErrInternal> {
2097 let mut channel_state_lock = self.channel_state.lock().unwrap();
2098 let channel_state = &mut *channel_state_lock;
2099 match channel_state.by_id.entry(msg.channel_id) {
2100 hash_map::Entry::Occupied(mut chan) => {
2101 if chan.get().get_their_node_id() != *their_node_id {
2102 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2104 try_chan_entry!(self, chan.get_mut().funding_locked(&msg), channel_state, chan);
2105 if let Some(announcement_sigs) = self.get_announcement_sigs(chan.get()) {
2106 log_trace!(self, "Sending announcement_signatures for {} in response to funding_locked", log_bytes!(chan.get().channel_id()));
2107 // If we see locking block before receiving remote funding_locked, we broadcast our
2108 // announcement_sigs at remote funding_locked reception. If we receive remote
2109 // funding_locked before seeing locking block, we broadcast our announcement_sigs at locking
2110 // block connection. We should guanrantee to broadcast announcement_sigs to our peer whatever
2111 // the order of the events but our peer may not receive it due to disconnection. The specs
2112 // lacking an acknowledgement for announcement_sigs we may have to re-send them at peer
2113 // connection in the future if simultaneous misses by both peers due to network/hardware
2114 // failures is an issue. Note, to achieve its goal, only one of the announcement_sigs needs
2115 // to be received, from then sigs are going to be flood to the whole network.
2116 channel_state.pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
2117 node_id: their_node_id.clone(),
2118 msg: announcement_sigs,
2123 hash_map::Entry::Vacant(_) => Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2127 fn internal_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) -> Result<(), MsgHandleErrInternal> {
2128 let (mut dropped_htlcs, chan_option) = {
2129 let mut channel_state_lock = self.channel_state.lock().unwrap();
2130 let channel_state = &mut *channel_state_lock;
2132 match channel_state.by_id.entry(msg.channel_id.clone()) {
2133 hash_map::Entry::Occupied(mut chan_entry) => {
2134 if chan_entry.get().get_their_node_id() != *their_node_id {
2135 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2137 let (shutdown, closing_signed, dropped_htlcs) = try_chan_entry!(self, chan_entry.get_mut().shutdown(&self.fee_estimator, &msg), channel_state, chan_entry);
2138 if let Some(msg) = shutdown {
2139 channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
2140 node_id: their_node_id.clone(),
2144 if let Some(msg) = closing_signed {
2145 channel_state.pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
2146 node_id: their_node_id.clone(),
2150 if chan_entry.get().is_shutdown() {
2151 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
2152 channel_state.short_to_id.remove(&short_id);
2154 (dropped_htlcs, Some(chan_entry.remove_entry().1))
2155 } else { (dropped_htlcs, None) }
2157 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2160 for htlc_source in dropped_htlcs.drain(..) {
2161 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source.0, &htlc_source.1, HTLCFailReason::Reason { failure_code: 0x4000 | 8, data: Vec::new() });
2163 if let Some(chan) = chan_option {
2164 if let Ok(update) = self.get_channel_update(&chan) {
2165 let mut channel_state = self.channel_state.lock().unwrap();
2166 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
2174 fn internal_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<(), MsgHandleErrInternal> {
2175 let (tx, chan_option) = {
2176 let mut channel_state_lock = self.channel_state.lock().unwrap();
2177 let channel_state = &mut *channel_state_lock;
2178 match channel_state.by_id.entry(msg.channel_id.clone()) {
2179 hash_map::Entry::Occupied(mut chan_entry) => {
2180 if chan_entry.get().get_their_node_id() != *their_node_id {
2181 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2183 let (closing_signed, tx) = try_chan_entry!(self, chan_entry.get_mut().closing_signed(&self.fee_estimator, &msg), channel_state, chan_entry);
2184 if let Some(msg) = closing_signed {
2185 channel_state.pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
2186 node_id: their_node_id.clone(),
2191 // We're done with this channel, we've got a signed closing transaction and
2192 // will send the closing_signed back to the remote peer upon return. This
2193 // also implies there are no pending HTLCs left on the channel, so we can
2194 // fully delete it from tracking (the channel monitor is still around to
2195 // watch for old state broadcasts)!
2196 if let Some(short_id) = chan_entry.get().get_short_channel_id() {
2197 channel_state.short_to_id.remove(&short_id);
2199 (tx, Some(chan_entry.remove_entry().1))
2200 } else { (tx, None) }
2202 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2205 if let Some(broadcast_tx) = tx {
2206 log_trace!(self, "Broadcast onchain {}", log_tx!(broadcast_tx));
2207 self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
2209 if let Some(chan) = chan_option {
2210 if let Ok(update) = self.get_channel_update(&chan) {
2211 let mut channel_state = self.channel_state.lock().unwrap();
2212 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
2220 fn internal_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), MsgHandleErrInternal> {
2221 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
2222 //determine the state of the payment based on our response/if we forward anything/the time
2223 //we take to respond. We should take care to avoid allowing such an attack.
2225 //TODO: There exists a further attack where a node may garble the onion data, forward it to
2226 //us repeatedly garbled in different ways, and compare our error messages, which are
2227 //encrypted with the same key. It's not immediately obvious how to usefully exploit that,
2228 //but we should prevent it anyway.
2230 let (mut pending_forward_info, mut channel_state_lock) = self.decode_update_add_htlc_onion(msg);
2231 let channel_state = &mut *channel_state_lock;
2233 match channel_state.by_id.entry(msg.channel_id) {
2234 hash_map::Entry::Occupied(mut chan) => {
2235 if chan.get().get_their_node_id() != *their_node_id {
2236 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2238 if !chan.get().is_usable() {
2239 // If the update_add is completely bogus, the call will Err and we will close,
2240 // but if we've sent a shutdown and they haven't acknowledged it yet, we just
2241 // want to reject the new HTLC and fail it backwards instead of forwarding.
2242 if let PendingHTLCStatus::Forward(PendingHTLCInfo { incoming_shared_secret, .. }) = pending_forward_info {
2243 let chan_update = self.get_channel_update(chan.get());
2244 pending_forward_info = PendingHTLCStatus::Fail(HTLCFailureMsg::Relay(msgs::UpdateFailHTLC {
2245 channel_id: msg.channel_id,
2246 htlc_id: msg.htlc_id,
2247 reason: if let Ok(update) = chan_update {
2248 // TODO: Note that |20 is defined as "channel FROM the processing
2249 // node has been disabled" (emphasis mine), which seems to imply
2250 // that we can't return |20 for an inbound channel being disabled.
2251 // This probably needs a spec update but should definitely be
2253 onion_utils::build_first_hop_failure_packet(&incoming_shared_secret, 0x1000|20, &{
2254 let mut res = Vec::with_capacity(8 + 128);
2255 res.extend_from_slice(&byte_utils::be16_to_array(update.contents.flags));
2256 res.extend_from_slice(&update.encode_with_len()[..]);
2260 // This can only happen if the channel isn't in the fully-funded
2261 // state yet, implying our counterparty is trying to route payments
2262 // over the channel back to themselves (cause no one else should
2263 // know the short_id is a lightning channel yet). We should have no
2264 // problem just calling this unknown_next_peer
2265 onion_utils::build_first_hop_failure_packet(&incoming_shared_secret, 0x4000|10, &[])
2270 try_chan_entry!(self, chan.get_mut().update_add_htlc(&msg, pending_forward_info), channel_state, chan);
2272 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2277 fn internal_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), MsgHandleErrInternal> {
2278 let mut channel_lock = self.channel_state.lock().unwrap();
2280 let channel_state = &mut *channel_lock;
2281 match channel_state.by_id.entry(msg.channel_id) {
2282 hash_map::Entry::Occupied(mut chan) => {
2283 if chan.get().get_their_node_id() != *their_node_id {
2284 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2286 try_chan_entry!(self, chan.get_mut().update_fulfill_htlc(&msg), channel_state, chan)
2288 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2291 self.claim_funds_internal(channel_lock, htlc_source, msg.payment_preimage.clone());
2295 fn internal_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<(), MsgHandleErrInternal> {
2296 let mut channel_lock = self.channel_state.lock().unwrap();
2297 let channel_state = &mut *channel_lock;
2298 match channel_state.by_id.entry(msg.channel_id) {
2299 hash_map::Entry::Occupied(mut chan) => {
2300 if chan.get().get_their_node_id() != *their_node_id {
2301 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2303 try_chan_entry!(self, chan.get_mut().update_fail_htlc(&msg, HTLCFailReason::LightningError { err: msg.reason.clone() }), channel_state, chan);
2305 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2310 fn internal_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), MsgHandleErrInternal> {
2311 let mut channel_lock = self.channel_state.lock().unwrap();
2312 let channel_state = &mut *channel_lock;
2313 match channel_state.by_id.entry(msg.channel_id) {
2314 hash_map::Entry::Occupied(mut chan) => {
2315 if chan.get().get_their_node_id() != *their_node_id {
2316 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2318 if (msg.failure_code & 0x8000) == 0 {
2319 let chan_err: ChannelError = ChannelError::Close("Got update_fail_malformed_htlc with BADONION not set");
2320 try_chan_entry!(self, Err(chan_err), channel_state, chan);
2322 try_chan_entry!(self, chan.get_mut().update_fail_malformed_htlc(&msg, HTLCFailReason::Reason { failure_code: msg.failure_code, data: Vec::new() }), channel_state, chan);
2325 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2329 fn internal_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(), MsgHandleErrInternal> {
2330 let mut channel_state_lock = self.channel_state.lock().unwrap();
2331 let channel_state = &mut *channel_state_lock;
2332 match channel_state.by_id.entry(msg.channel_id) {
2333 hash_map::Entry::Occupied(mut chan) => {
2334 if chan.get().get_their_node_id() != *their_node_id {
2335 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2337 let (revoke_and_ack, commitment_signed, closing_signed, monitor_update) =
2338 match chan.get_mut().commitment_signed(&msg, &self.fee_estimator) {
2339 Err((None, e)) => try_chan_entry!(self, Err(e), channel_state, chan),
2340 Err((Some(update), e)) => {
2341 assert!(chan.get().is_awaiting_monitor_update());
2342 let _ = self.monitor.update_monitor(chan.get().get_funding_txo().unwrap(), update);
2343 try_chan_entry!(self, Err(e), channel_state, chan);
2348 if let Err(e) = self.monitor.update_monitor(chan.get().get_funding_txo().unwrap(), monitor_update) {
2349 return_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::RevokeAndACKFirst, true, commitment_signed.is_some());
2350 //TODO: Rebroadcast closing_signed if present on monitor update restoration
2352 channel_state.pending_msg_events.push(events::MessageSendEvent::SendRevokeAndACK {
2353 node_id: their_node_id.clone(),
2354 msg: revoke_and_ack,
2356 if let Some(msg) = commitment_signed {
2357 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
2358 node_id: their_node_id.clone(),
2359 updates: msgs::CommitmentUpdate {
2360 update_add_htlcs: Vec::new(),
2361 update_fulfill_htlcs: Vec::new(),
2362 update_fail_htlcs: Vec::new(),
2363 update_fail_malformed_htlcs: Vec::new(),
2365 commitment_signed: msg,
2369 if let Some(msg) = closing_signed {
2370 channel_state.pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
2371 node_id: their_node_id.clone(),
2377 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2382 fn forward_htlcs(&self, per_source_pending_forwards: &mut [(u64, Vec<(PendingHTLCInfo, u64)>)]) {
2383 for &mut (prev_short_channel_id, ref mut pending_forwards) in per_source_pending_forwards {
2384 let mut forward_event = None;
2385 if !pending_forwards.is_empty() {
2386 let mut channel_state = self.channel_state.lock().unwrap();
2387 if channel_state.forward_htlcs.is_empty() {
2388 forward_event = Some(Duration::from_millis(MIN_HTLC_RELAY_HOLDING_CELL_MILLIS))
2390 for (forward_info, prev_htlc_id) in pending_forwards.drain(..) {
2391 match channel_state.forward_htlcs.entry(forward_info.short_channel_id) {
2392 hash_map::Entry::Occupied(mut entry) => {
2393 entry.get_mut().push(HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info });
2395 hash_map::Entry::Vacant(entry) => {
2396 entry.insert(vec!(HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info }));
2401 match forward_event {
2403 let mut pending_events = self.pending_events.lock().unwrap();
2404 pending_events.push(events::Event::PendingHTLCsForwardable {
2405 time_forwardable: time
2413 fn internal_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<(), MsgHandleErrInternal> {
2414 let (pending_forwards, mut pending_failures, short_channel_id) = {
2415 let mut channel_state_lock = self.channel_state.lock().unwrap();
2416 let channel_state = &mut *channel_state_lock;
2417 match channel_state.by_id.entry(msg.channel_id) {
2418 hash_map::Entry::Occupied(mut chan) => {
2419 if chan.get().get_their_node_id() != *their_node_id {
2420 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2422 let was_frozen_for_monitor = chan.get().is_awaiting_monitor_update();
2423 let (commitment_update, pending_forwards, pending_failures, closing_signed, monitor_update) =
2424 try_chan_entry!(self, chan.get_mut().revoke_and_ack(&msg, &self.fee_estimator), channel_state, chan);
2425 if let Err(e) = self.monitor.update_monitor(chan.get().get_funding_txo().unwrap(), monitor_update) {
2426 if was_frozen_for_monitor {
2427 assert!(commitment_update.is_none() && closing_signed.is_none() && pending_forwards.is_empty() && pending_failures.is_empty());
2428 return Err(MsgHandleErrInternal::ignore_no_close("Previous monitor update failure prevented responses to RAA"));
2430 return_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::CommitmentFirst, false, commitment_update.is_some(), pending_forwards, pending_failures);
2433 if let Some(updates) = commitment_update {
2434 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
2435 node_id: their_node_id.clone(),
2439 if let Some(msg) = closing_signed {
2440 channel_state.pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
2441 node_id: their_node_id.clone(),
2445 (pending_forwards, pending_failures, chan.get().get_short_channel_id().expect("RAA should only work on a short-id-available channel"))
2447 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2450 for failure in pending_failures.drain(..) {
2451 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), failure.0, &failure.1, failure.2);
2453 self.forward_htlcs(&mut [(short_channel_id, pending_forwards)]);
2458 fn internal_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), MsgHandleErrInternal> {
2459 let mut channel_lock = self.channel_state.lock().unwrap();
2460 let channel_state = &mut *channel_lock;
2461 match channel_state.by_id.entry(msg.channel_id) {
2462 hash_map::Entry::Occupied(mut chan) => {
2463 if chan.get().get_their_node_id() != *their_node_id {
2464 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2466 try_chan_entry!(self, chan.get_mut().update_fee(&self.fee_estimator, &msg), channel_state, chan);
2468 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2473 fn internal_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), MsgHandleErrInternal> {
2474 let mut channel_state_lock = self.channel_state.lock().unwrap();
2475 let channel_state = &mut *channel_state_lock;
2477 match channel_state.by_id.entry(msg.channel_id) {
2478 hash_map::Entry::Occupied(mut chan) => {
2479 if chan.get().get_their_node_id() != *their_node_id {
2480 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2482 if !chan.get().is_usable() {
2483 return Err(MsgHandleErrInternal::from_no_close(LightningError{err: "Got an announcement_signatures before we were ready for it", action: msgs::ErrorAction::IgnoreError}));
2486 let our_node_id = self.get_our_node_id();
2487 let (announcement, our_bitcoin_sig) =
2488 try_chan_entry!(self, chan.get_mut().get_channel_announcement(our_node_id.clone(), self.genesis_hash.clone()), channel_state, chan);
2490 let were_node_one = announcement.node_id_1 == our_node_id;
2491 let msghash = hash_to_message!(&Sha256dHash::hash(&announcement.encode()[..])[..]);
2492 if self.secp_ctx.verify(&msghash, &msg.node_signature, if were_node_one { &announcement.node_id_2 } else { &announcement.node_id_1 }).is_err() ||
2493 self.secp_ctx.verify(&msghash, &msg.bitcoin_signature, if were_node_one { &announcement.bitcoin_key_2 } else { &announcement.bitcoin_key_1 }).is_err() {
2494 let chan_err: ChannelError = ChannelError::Close("Bad announcement_signatures node_signature");
2495 try_chan_entry!(self, Err(chan_err), channel_state, chan);
2498 let our_node_sig = self.secp_ctx.sign(&msghash, &self.our_network_key);
2500 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelAnnouncement {
2501 msg: msgs::ChannelAnnouncement {
2502 node_signature_1: if were_node_one { our_node_sig } else { msg.node_signature },
2503 node_signature_2: if were_node_one { msg.node_signature } else { our_node_sig },
2504 bitcoin_signature_1: if were_node_one { our_bitcoin_sig } else { msg.bitcoin_signature },
2505 bitcoin_signature_2: if were_node_one { msg.bitcoin_signature } else { our_bitcoin_sig },
2506 contents: announcement,
2508 update_msg: self.get_channel_update(chan.get()).unwrap(), // can only fail if we're not in a ready state
2511 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2516 fn internal_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) -> Result<(), MsgHandleErrInternal> {
2517 let mut channel_state_lock = self.channel_state.lock().unwrap();
2518 let channel_state = &mut *channel_state_lock;
2520 match channel_state.by_id.entry(msg.channel_id) {
2521 hash_map::Entry::Occupied(mut chan) => {
2522 if chan.get().get_their_node_id() != *their_node_id {
2523 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!", msg.channel_id));
2525 let (funding_locked, revoke_and_ack, commitment_update, monitor_update_opt, mut order, shutdown) =
2526 try_chan_entry!(self, chan.get_mut().channel_reestablish(msg), channel_state, chan);
2527 if let Some(monitor_update) = monitor_update_opt {
2528 if let Err(e) = self.monitor.update_monitor(chan.get().get_funding_txo().unwrap(), monitor_update) {
2529 // channel_reestablish doesn't guarantee the order it returns is sensical
2530 // for the messages it returns, but if we're setting what messages to
2531 // re-transmit on monitor update success, we need to make sure it is sane.
2532 if revoke_and_ack.is_none() {
2533 order = RAACommitmentOrder::CommitmentFirst;
2535 if commitment_update.is_none() {
2536 order = RAACommitmentOrder::RevokeAndACKFirst;
2538 return_monitor_err!(self, e, channel_state, chan, order, revoke_and_ack.is_some(), commitment_update.is_some());
2539 //TODO: Resend the funding_locked if needed once we get the monitor running again
2542 if let Some(msg) = funding_locked {
2543 channel_state.pending_msg_events.push(events::MessageSendEvent::SendFundingLocked {
2544 node_id: their_node_id.clone(),
2548 macro_rules! send_raa { () => {
2549 if let Some(msg) = revoke_and_ack {
2550 channel_state.pending_msg_events.push(events::MessageSendEvent::SendRevokeAndACK {
2551 node_id: their_node_id.clone(),
2556 macro_rules! send_cu { () => {
2557 if let Some(updates) = commitment_update {
2558 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
2559 node_id: their_node_id.clone(),
2565 RAACommitmentOrder::RevokeAndACKFirst => {
2569 RAACommitmentOrder::CommitmentFirst => {
2574 if let Some(msg) = shutdown {
2575 channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
2576 node_id: their_node_id.clone(),
2582 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel", msg.channel_id))
2586 /// Begin Update fee process. Allowed only on an outbound channel.
2587 /// If successful, will generate a UpdateHTLCs event, so you should probably poll
2588 /// PeerManager::process_events afterwards.
2589 /// Note: This API is likely to change!
2591 pub fn update_fee(&self, channel_id: [u8;32], feerate_per_kw: u64) -> Result<(), APIError> {
2592 let _ = self.total_consistency_lock.read().unwrap();
2594 let err: Result<(), _> = loop {
2595 let mut channel_state_lock = self.channel_state.lock().unwrap();
2596 let channel_state = &mut *channel_state_lock;
2598 match channel_state.by_id.entry(channel_id) {
2599 hash_map::Entry::Vacant(_) => return Err(APIError::APIMisuseError{err: "Failed to find corresponding channel"}),
2600 hash_map::Entry::Occupied(mut chan) => {
2601 if !chan.get().is_outbound() {
2602 return Err(APIError::APIMisuseError{err: "update_fee cannot be sent for an inbound channel"});
2604 if chan.get().is_awaiting_monitor_update() {
2605 return Err(APIError::MonitorUpdateFailed);
2607 if !chan.get().is_live() {
2608 return Err(APIError::ChannelUnavailable{err: "Channel is either not yet fully established or peer is currently disconnected"});
2610 their_node_id = chan.get().get_their_node_id();
2611 if let Some((update_fee, commitment_signed, monitor_update)) =
2612 break_chan_entry!(self, chan.get_mut().send_update_fee_and_commit(feerate_per_kw), channel_state, chan)
2614 if let Err(_e) = self.monitor.update_monitor(chan.get().get_funding_txo().unwrap(), monitor_update) {
2617 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
2618 node_id: chan.get().get_their_node_id(),
2619 updates: msgs::CommitmentUpdate {
2620 update_add_htlcs: Vec::new(),
2621 update_fulfill_htlcs: Vec::new(),
2622 update_fail_htlcs: Vec::new(),
2623 update_fail_malformed_htlcs: Vec::new(),
2624 update_fee: Some(update_fee),
2634 match handle_error!(self, err, their_node_id) {
2635 Ok(_) => unreachable!(),
2636 Err(e) => { Err(APIError::APIMisuseError { err: e.err })}
2641 impl<ChanSigner: ChannelKeys, M: Deref, T: Deref, K: Deref, F: Deref> events::MessageSendEventsProvider for ChannelManager<ChanSigner, M, T, K, F>
2642 where M::Target: ManyChannelMonitor<ChanSigner>,
2643 T::Target: BroadcasterInterface,
2644 K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
2645 F::Target: FeeEstimator,
2647 fn get_and_clear_pending_msg_events(&self) -> Vec<events::MessageSendEvent> {
2648 // TODO: Event release to users and serialization is currently race-y: it's very easy for a
2649 // user to serialize a ChannelManager with pending events in it and lose those events on
2650 // restart. This is doubly true for the fail/fulfill-backs from monitor events!
2652 //TODO: This behavior should be documented.
2653 for htlc_update in self.monitor.get_and_clear_pending_htlcs_updated() {
2654 if let Some(preimage) = htlc_update.payment_preimage {
2655 log_trace!(self, "Claiming HTLC with preimage {} from our monitor", log_bytes!(preimage.0));
2656 self.claim_funds_internal(self.channel_state.lock().unwrap(), htlc_update.source, preimage);
2658 log_trace!(self, "Failing HTLC with hash {} from our monitor", log_bytes!(htlc_update.payment_hash.0));
2659 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_update.source, &htlc_update.payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 8, data: Vec::new() });
2664 let mut ret = Vec::new();
2665 let mut channel_state = self.channel_state.lock().unwrap();
2666 mem::swap(&mut ret, &mut channel_state.pending_msg_events);
2671 impl<ChanSigner: ChannelKeys, M: Deref, T: Deref, K: Deref, F: Deref> events::EventsProvider for ChannelManager<ChanSigner, M, T, K, F>
2672 where M::Target: ManyChannelMonitor<ChanSigner>,
2673 T::Target: BroadcasterInterface,
2674 K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
2675 F::Target: FeeEstimator,
2677 fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
2678 // TODO: Event release to users and serialization is currently race-y: it's very easy for a
2679 // user to serialize a ChannelManager with pending events in it and lose those events on
2680 // restart. This is doubly true for the fail/fulfill-backs from monitor events!
2682 //TODO: This behavior should be documented.
2683 for htlc_update in self.monitor.get_and_clear_pending_htlcs_updated() {
2684 if let Some(preimage) = htlc_update.payment_preimage {
2685 log_trace!(self, "Claiming HTLC with preimage {} from our monitor", log_bytes!(preimage.0));
2686 self.claim_funds_internal(self.channel_state.lock().unwrap(), htlc_update.source, preimage);
2688 log_trace!(self, "Failing HTLC with hash {} from our monitor", log_bytes!(htlc_update.payment_hash.0));
2689 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_update.source, &htlc_update.payment_hash, HTLCFailReason::Reason { failure_code: 0x4000 | 8, data: Vec::new() });
2694 let mut ret = Vec::new();
2695 let mut pending_events = self.pending_events.lock().unwrap();
2696 mem::swap(&mut ret, &mut *pending_events);
2701 impl<ChanSigner: ChannelKeys, M: Deref + Sync + Send, T: Deref + Sync + Send, K: Deref + Sync + Send, F: Deref + Sync + Send>
2702 ChainListener for ChannelManager<ChanSigner, M, T, K, F>
2703 where M::Target: ManyChannelMonitor<ChanSigner>,
2704 T::Target: BroadcasterInterface,
2705 K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
2706 F::Target: FeeEstimator,
2708 fn block_connected(&self, header: &BlockHeader, height: u32, txn_matched: &[&Transaction], indexes_of_txn_matched: &[u32]) {
2709 let header_hash = header.bitcoin_hash();
2710 log_trace!(self, "Block {} at height {} connected with {} txn matched", header_hash, height, txn_matched.len());
2711 let _ = self.total_consistency_lock.read().unwrap();
2712 let mut failed_channels = Vec::new();
2714 let mut channel_lock = self.channel_state.lock().unwrap();
2715 let channel_state = &mut *channel_lock;
2716 let short_to_id = &mut channel_state.short_to_id;
2717 let pending_msg_events = &mut channel_state.pending_msg_events;
2718 channel_state.by_id.retain(|_, channel| {
2719 let chan_res = channel.block_connected(header, height, txn_matched, indexes_of_txn_matched);
2720 if let Ok(Some(funding_locked)) = chan_res {
2721 pending_msg_events.push(events::MessageSendEvent::SendFundingLocked {
2722 node_id: channel.get_their_node_id(),
2723 msg: funding_locked,
2725 if let Some(announcement_sigs) = self.get_announcement_sigs(channel) {
2726 log_trace!(self, "Sending funding_locked and announcement_signatures for {}", log_bytes!(channel.channel_id()));
2727 pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
2728 node_id: channel.get_their_node_id(),
2729 msg: announcement_sigs,
2732 log_trace!(self, "Sending funding_locked WITHOUT announcement_signatures for {}", log_bytes!(channel.channel_id()));
2734 short_to_id.insert(channel.get_short_channel_id().unwrap(), channel.channel_id());
2735 } else if let Err(e) = chan_res {
2736 pending_msg_events.push(events::MessageSendEvent::HandleError {
2737 node_id: channel.get_their_node_id(),
2738 action: msgs::ErrorAction::SendErrorMessage { msg: e },
2742 if let Some(funding_txo) = channel.get_funding_txo() {
2743 for tx in txn_matched {
2744 for inp in tx.input.iter() {
2745 if inp.previous_output == funding_txo.into_bitcoin_outpoint() {
2746 log_trace!(self, "Detected channel-closing tx {} spending {}:{}, closing channel {}", tx.txid(), inp.previous_output.txid, inp.previous_output.vout, log_bytes!(channel.channel_id()));
2747 if let Some(short_id) = channel.get_short_channel_id() {
2748 short_to_id.remove(&short_id);
2750 // It looks like our counterparty went on-chain. We go ahead and
2751 // broadcast our latest local state as well here, just in case its
2752 // some kind of SPV attack, though we expect these to be dropped.
2753 failed_channels.push(channel.force_shutdown(true));
2754 if let Ok(update) = self.get_channel_update(&channel) {
2755 pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
2764 if channel.is_funding_initiated() && channel.channel_monitor().would_broadcast_at_height(height) {
2765 if let Some(short_id) = channel.get_short_channel_id() {
2766 short_to_id.remove(&short_id);
2768 // If would_broadcast_at_height() is true, the channel_monitor will broadcast
2769 // the latest local tx for us, so we should skip that here (it doesn't really
2770 // hurt anything, but does make tests a bit simpler).
2771 failed_channels.push(channel.force_shutdown(false));
2772 if let Ok(update) = self.get_channel_update(&channel) {
2773 pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
2782 for failure in failed_channels.drain(..) {
2783 self.finish_force_close_channel(failure);
2785 self.latest_block_height.store(height as usize, Ordering::Release);
2786 *self.last_block_hash.try_lock().expect("block_(dis)connected must not be called in parallel") = header_hash;
2788 // Update last_node_announcement_serial to be the max of its current value and the
2789 // block timestamp. This should keep us close to the current time without relying on
2790 // having an explicit local time source.
2791 // Just in case we end up in a race, we loop until we either successfully update
2792 // last_node_announcement_serial or decide we don't need to.
2793 let old_serial = self.last_node_announcement_serial.load(Ordering::Acquire);
2794 if old_serial >= header.time as usize { break; }
2795 if self.last_node_announcement_serial.compare_exchange(old_serial, header.time as usize, Ordering::AcqRel, Ordering::Relaxed).is_ok() {
2801 /// We force-close the channel without letting our counterparty participate in the shutdown
2802 fn block_disconnected(&self, header: &BlockHeader, _: u32) {
2803 let _ = self.total_consistency_lock.read().unwrap();
2804 let mut failed_channels = Vec::new();
2806 let mut channel_lock = self.channel_state.lock().unwrap();
2807 let channel_state = &mut *channel_lock;
2808 let short_to_id = &mut channel_state.short_to_id;
2809 let pending_msg_events = &mut channel_state.pending_msg_events;
2810 channel_state.by_id.retain(|_, v| {
2811 if v.block_disconnected(header) {
2812 if let Some(short_id) = v.get_short_channel_id() {
2813 short_to_id.remove(&short_id);
2815 failed_channels.push(v.force_shutdown(true));
2816 if let Ok(update) = self.get_channel_update(&v) {
2817 pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
2827 for failure in failed_channels.drain(..) {
2828 self.finish_force_close_channel(failure);
2830 self.latest_block_height.fetch_sub(1, Ordering::AcqRel);
2831 *self.last_block_hash.try_lock().expect("block_(dis)connected must not be called in parallel") = header.bitcoin_hash();
2835 impl<ChanSigner: ChannelKeys, M: Deref + Sync + Send, T: Deref + Sync + Send, K: Deref + Sync + Send, F: Deref + Sync + Send>
2836 ChannelMessageHandler for ChannelManager<ChanSigner, M, T, K, F>
2837 where M::Target: ManyChannelMonitor<ChanSigner>,
2838 T::Target: BroadcasterInterface,
2839 K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
2840 F::Target: FeeEstimator,
2842 fn handle_open_channel(&self, their_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::OpenChannel) {
2843 let _ = self.total_consistency_lock.read().unwrap();
2844 let _ = handle_error!(self, self.internal_open_channel(their_node_id, their_features, msg), *their_node_id);
2847 fn handle_accept_channel(&self, their_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::AcceptChannel) {
2848 let _ = self.total_consistency_lock.read().unwrap();
2849 let _ = handle_error!(self, self.internal_accept_channel(their_node_id, their_features, msg), *their_node_id);
2852 fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &msgs::FundingCreated) {
2853 let _ = self.total_consistency_lock.read().unwrap();
2854 let _ = handle_error!(self, self.internal_funding_created(their_node_id, msg), *their_node_id);
2857 fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &msgs::FundingSigned) {
2858 let _ = self.total_consistency_lock.read().unwrap();
2859 let _ = handle_error!(self, self.internal_funding_signed(their_node_id, msg), *their_node_id);
2862 fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &msgs::FundingLocked) {
2863 let _ = self.total_consistency_lock.read().unwrap();
2864 let _ = handle_error!(self, self.internal_funding_locked(their_node_id, msg), *their_node_id);
2867 fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &msgs::Shutdown) {
2868 let _ = self.total_consistency_lock.read().unwrap();
2869 let _ = handle_error!(self, self.internal_shutdown(their_node_id, msg), *their_node_id);
2872 fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &msgs::ClosingSigned) {
2873 let _ = self.total_consistency_lock.read().unwrap();
2874 let _ = handle_error!(self, self.internal_closing_signed(their_node_id, msg), *their_node_id);
2877 fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) {
2878 let _ = self.total_consistency_lock.read().unwrap();
2879 let _ = handle_error!(self, self.internal_update_add_htlc(their_node_id, msg), *their_node_id);
2882 fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) {
2883 let _ = self.total_consistency_lock.read().unwrap();
2884 let _ = handle_error!(self, self.internal_update_fulfill_htlc(their_node_id, msg), *their_node_id);
2887 fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) {
2888 let _ = self.total_consistency_lock.read().unwrap();
2889 let _ = handle_error!(self, self.internal_update_fail_htlc(their_node_id, msg), *their_node_id);
2892 fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) {
2893 let _ = self.total_consistency_lock.read().unwrap();
2894 let _ = handle_error!(self, self.internal_update_fail_malformed_htlc(their_node_id, msg), *their_node_id);
2897 fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &msgs::CommitmentSigned) {
2898 let _ = self.total_consistency_lock.read().unwrap();
2899 let _ = handle_error!(self, self.internal_commitment_signed(their_node_id, msg), *their_node_id);
2902 fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &msgs::RevokeAndACK) {
2903 let _ = self.total_consistency_lock.read().unwrap();
2904 let _ = handle_error!(self, self.internal_revoke_and_ack(their_node_id, msg), *their_node_id);
2907 fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &msgs::UpdateFee) {
2908 let _ = self.total_consistency_lock.read().unwrap();
2909 let _ = handle_error!(self, self.internal_update_fee(their_node_id, msg), *their_node_id);
2912 fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) {
2913 let _ = self.total_consistency_lock.read().unwrap();
2914 let _ = handle_error!(self, self.internal_announcement_signatures(their_node_id, msg), *their_node_id);
2917 fn handle_channel_reestablish(&self, their_node_id: &PublicKey, msg: &msgs::ChannelReestablish) {
2918 let _ = self.total_consistency_lock.read().unwrap();
2919 let _ = handle_error!(self, self.internal_channel_reestablish(their_node_id, msg), *their_node_id);
2922 fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool) {
2923 let _ = self.total_consistency_lock.read().unwrap();
2924 let mut failed_channels = Vec::new();
2925 let mut failed_payments = Vec::new();
2926 let mut no_channels_remain = true;
2928 let mut channel_state_lock = self.channel_state.lock().unwrap();
2929 let channel_state = &mut *channel_state_lock;
2930 let short_to_id = &mut channel_state.short_to_id;
2931 let pending_msg_events = &mut channel_state.pending_msg_events;
2932 if no_connection_possible {
2933 log_debug!(self, "Failing all channels with {} due to no_connection_possible", log_pubkey!(their_node_id));
2934 channel_state.by_id.retain(|_, chan| {
2935 if chan.get_their_node_id() == *their_node_id {
2936 if let Some(short_id) = chan.get_short_channel_id() {
2937 short_to_id.remove(&short_id);
2939 failed_channels.push(chan.force_shutdown(true));
2940 if let Ok(update) = self.get_channel_update(&chan) {
2941 pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
2951 log_debug!(self, "Marking channels with {} disconnected and generating channel_updates", log_pubkey!(their_node_id));
2952 channel_state.by_id.retain(|_, chan| {
2953 if chan.get_their_node_id() == *their_node_id {
2954 let failed_adds = chan.remove_uncommitted_htlcs_and_mark_paused();
2955 chan.to_disabled_marked();
2956 if !failed_adds.is_empty() {
2957 let chan_update = self.get_channel_update(&chan).map(|u| u.encode_with_len()).unwrap(); // Cannot add/recv HTLCs before we have a short_id so unwrap is safe
2958 failed_payments.push((chan_update, failed_adds));
2960 if chan.is_shutdown() {
2961 if let Some(short_id) = chan.get_short_channel_id() {
2962 short_to_id.remove(&short_id);
2966 no_channels_remain = false;
2972 pending_msg_events.retain(|msg| {
2974 &events::MessageSendEvent::SendAcceptChannel { ref node_id, .. } => node_id != their_node_id,
2975 &events::MessageSendEvent::SendOpenChannel { ref node_id, .. } => node_id != their_node_id,
2976 &events::MessageSendEvent::SendFundingCreated { ref node_id, .. } => node_id != their_node_id,
2977 &events::MessageSendEvent::SendFundingSigned { ref node_id, .. } => node_id != their_node_id,
2978 &events::MessageSendEvent::SendFundingLocked { ref node_id, .. } => node_id != their_node_id,
2979 &events::MessageSendEvent::SendAnnouncementSignatures { ref node_id, .. } => node_id != their_node_id,
2980 &events::MessageSendEvent::UpdateHTLCs { ref node_id, .. } => node_id != their_node_id,
2981 &events::MessageSendEvent::SendRevokeAndACK { ref node_id, .. } => node_id != their_node_id,
2982 &events::MessageSendEvent::SendClosingSigned { ref node_id, .. } => node_id != their_node_id,
2983 &events::MessageSendEvent::SendShutdown { ref node_id, .. } => node_id != their_node_id,
2984 &events::MessageSendEvent::SendChannelReestablish { ref node_id, .. } => node_id != their_node_id,
2985 &events::MessageSendEvent::BroadcastChannelAnnouncement { .. } => true,
2986 &events::MessageSendEvent::BroadcastNodeAnnouncement { .. } => true,
2987 &events::MessageSendEvent::BroadcastChannelUpdate { .. } => true,
2988 &events::MessageSendEvent::HandleError { ref node_id, .. } => node_id != their_node_id,
2989 &events::MessageSendEvent::PaymentFailureNetworkUpdate { .. } => true,
2993 if no_channels_remain {
2994 self.per_peer_state.write().unwrap().remove(their_node_id);
2997 for failure in failed_channels.drain(..) {
2998 self.finish_force_close_channel(failure);
3000 for (chan_update, mut htlc_sources) in failed_payments {
3001 for (htlc_source, payment_hash) in htlc_sources.drain(..) {
3002 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source, &payment_hash, HTLCFailReason::Reason { failure_code: 0x1000 | 7, data: chan_update.clone() });
3007 fn peer_connected(&self, their_node_id: &PublicKey, init_msg: &msgs::Init) {
3008 log_debug!(self, "Generating channel_reestablish events for {}", log_pubkey!(their_node_id));
3010 let _ = self.total_consistency_lock.read().unwrap();
3013 let mut peer_state_lock = self.per_peer_state.write().unwrap();
3014 match peer_state_lock.entry(their_node_id.clone()) {
3015 hash_map::Entry::Vacant(e) => {
3016 e.insert(Mutex::new(PeerState {
3017 latest_features: init_msg.features.clone(),
3020 hash_map::Entry::Occupied(e) => {
3021 e.get().lock().unwrap().latest_features = init_msg.features.clone();
3026 let mut channel_state_lock = self.channel_state.lock().unwrap();
3027 let channel_state = &mut *channel_state_lock;
3028 let pending_msg_events = &mut channel_state.pending_msg_events;
3029 channel_state.by_id.retain(|_, chan| {
3030 if chan.get_their_node_id() == *their_node_id {
3031 if !chan.have_received_message() {
3032 // If we created this (outbound) channel while we were disconnected from the
3033 // peer we probably failed to send the open_channel message, which is now
3034 // lost. We can't have had anything pending related to this channel, so we just
3038 pending_msg_events.push(events::MessageSendEvent::SendChannelReestablish {
3039 node_id: chan.get_their_node_id(),
3040 msg: chan.get_channel_reestablish(),
3046 //TODO: Also re-broadcast announcement_signatures
3049 fn handle_error(&self, their_node_id: &PublicKey, msg: &msgs::ErrorMessage) {
3050 let _ = self.total_consistency_lock.read().unwrap();
3052 if msg.channel_id == [0; 32] {
3053 for chan in self.list_channels() {
3054 if chan.remote_network_id == *their_node_id {
3055 self.force_close_channel(&chan.channel_id);
3059 self.force_close_channel(&msg.channel_id);
3064 const SERIALIZATION_VERSION: u8 = 1;
3065 const MIN_SERIALIZATION_VERSION: u8 = 1;
3067 impl Writeable for PendingHTLCInfo {
3068 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
3069 self.onion_packet.write(writer)?;
3070 self.incoming_shared_secret.write(writer)?;
3071 self.payment_hash.write(writer)?;
3072 self.short_channel_id.write(writer)?;
3073 self.amt_to_forward.write(writer)?;
3074 self.outgoing_cltv_value.write(writer)?;
3079 impl Readable for PendingHTLCInfo {
3080 fn read<R: ::std::io::Read>(reader: &mut R) -> Result<PendingHTLCInfo, DecodeError> {
3081 Ok(PendingHTLCInfo {
3082 onion_packet: Readable::read(reader)?,
3083 incoming_shared_secret: Readable::read(reader)?,
3084 payment_hash: Readable::read(reader)?,
3085 short_channel_id: Readable::read(reader)?,
3086 amt_to_forward: Readable::read(reader)?,
3087 outgoing_cltv_value: Readable::read(reader)?,
3092 impl Writeable for HTLCFailureMsg {
3093 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
3095 &HTLCFailureMsg::Relay(ref fail_msg) => {
3097 fail_msg.write(writer)?;
3099 &HTLCFailureMsg::Malformed(ref fail_msg) => {
3101 fail_msg.write(writer)?;
3108 impl Readable for HTLCFailureMsg {
3109 fn read<R: ::std::io::Read>(reader: &mut R) -> Result<HTLCFailureMsg, DecodeError> {
3110 match <u8 as Readable>::read(reader)? {
3111 0 => Ok(HTLCFailureMsg::Relay(Readable::read(reader)?)),
3112 1 => Ok(HTLCFailureMsg::Malformed(Readable::read(reader)?)),
3113 _ => Err(DecodeError::InvalidValue),
3118 impl Writeable for PendingHTLCStatus {
3119 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
3121 &PendingHTLCStatus::Forward(ref forward_info) => {
3123 forward_info.write(writer)?;
3125 &PendingHTLCStatus::Fail(ref fail_msg) => {
3127 fail_msg.write(writer)?;
3134 impl Readable for PendingHTLCStatus {
3135 fn read<R: ::std::io::Read>(reader: &mut R) -> Result<PendingHTLCStatus, DecodeError> {
3136 match <u8 as Readable>::read(reader)? {
3137 0 => Ok(PendingHTLCStatus::Forward(Readable::read(reader)?)),
3138 1 => Ok(PendingHTLCStatus::Fail(Readable::read(reader)?)),
3139 _ => Err(DecodeError::InvalidValue),
3144 impl_writeable!(HTLCPreviousHopData, 0, {
3147 incoming_packet_shared_secret
3150 impl Writeable for HTLCSource {
3151 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
3153 &HTLCSource::PreviousHopData(ref hop_data) => {
3155 hop_data.write(writer)?;
3157 &HTLCSource::OutboundRoute { ref route, ref session_priv, ref first_hop_htlc_msat } => {
3159 route.write(writer)?;
3160 session_priv.write(writer)?;
3161 first_hop_htlc_msat.write(writer)?;
3168 impl Readable for HTLCSource {
3169 fn read<R: ::std::io::Read>(reader: &mut R) -> Result<HTLCSource, DecodeError> {
3170 match <u8 as Readable>::read(reader)? {
3171 0 => Ok(HTLCSource::PreviousHopData(Readable::read(reader)?)),
3172 1 => Ok(HTLCSource::OutboundRoute {
3173 route: Readable::read(reader)?,
3174 session_priv: Readable::read(reader)?,
3175 first_hop_htlc_msat: Readable::read(reader)?,
3177 _ => Err(DecodeError::InvalidValue),
3182 impl Writeable for HTLCFailReason {
3183 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
3185 &HTLCFailReason::LightningError { ref err } => {
3189 &HTLCFailReason::Reason { ref failure_code, ref data } => {
3191 failure_code.write(writer)?;
3192 data.write(writer)?;
3199 impl Readable for HTLCFailReason {
3200 fn read<R: ::std::io::Read>(reader: &mut R) -> Result<HTLCFailReason, DecodeError> {
3201 match <u8 as Readable>::read(reader)? {
3202 0 => Ok(HTLCFailReason::LightningError { err: Readable::read(reader)? }),
3203 1 => Ok(HTLCFailReason::Reason {
3204 failure_code: Readable::read(reader)?,
3205 data: Readable::read(reader)?,
3207 _ => Err(DecodeError::InvalidValue),
3212 impl Writeable for HTLCForwardInfo {
3213 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
3215 &HTLCForwardInfo::AddHTLC { ref prev_short_channel_id, ref prev_htlc_id, ref forward_info } => {
3217 prev_short_channel_id.write(writer)?;
3218 prev_htlc_id.write(writer)?;
3219 forward_info.write(writer)?;
3221 &HTLCForwardInfo::FailHTLC { ref htlc_id, ref err_packet } => {
3223 htlc_id.write(writer)?;
3224 err_packet.write(writer)?;
3231 impl Readable for HTLCForwardInfo {
3232 fn read<R: ::std::io::Read>(reader: &mut R) -> Result<HTLCForwardInfo, DecodeError> {
3233 match <u8 as Readable>::read(reader)? {
3234 0 => Ok(HTLCForwardInfo::AddHTLC {
3235 prev_short_channel_id: Readable::read(reader)?,
3236 prev_htlc_id: Readable::read(reader)?,
3237 forward_info: Readable::read(reader)?,
3239 1 => Ok(HTLCForwardInfo::FailHTLC {
3240 htlc_id: Readable::read(reader)?,
3241 err_packet: Readable::read(reader)?,
3243 _ => Err(DecodeError::InvalidValue),
3248 impl<ChanSigner: ChannelKeys + Writeable, M: Deref, T: Deref, K: Deref, F: Deref> Writeable for ChannelManager<ChanSigner, M, T, K, F>
3249 where M::Target: ManyChannelMonitor<ChanSigner>,
3250 T::Target: BroadcasterInterface,
3251 K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
3252 F::Target: FeeEstimator,
3254 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
3255 let _ = self.total_consistency_lock.write().unwrap();
3257 writer.write_all(&[SERIALIZATION_VERSION; 1])?;
3258 writer.write_all(&[MIN_SERIALIZATION_VERSION; 1])?;
3260 self.genesis_hash.write(writer)?;
3261 (self.latest_block_height.load(Ordering::Acquire) as u32).write(writer)?;
3262 self.last_block_hash.lock().unwrap().write(writer)?;
3264 let channel_state = self.channel_state.lock().unwrap();
3265 let mut unfunded_channels = 0;
3266 for (_, channel) in channel_state.by_id.iter() {
3267 if !channel.is_funding_initiated() {
3268 unfunded_channels += 1;
3271 ((channel_state.by_id.len() - unfunded_channels) as u64).write(writer)?;
3272 for (_, channel) in channel_state.by_id.iter() {
3273 if channel.is_funding_initiated() {
3274 channel.write(writer)?;
3278 (channel_state.forward_htlcs.len() as u64).write(writer)?;
3279 for (short_channel_id, pending_forwards) in channel_state.forward_htlcs.iter() {
3280 short_channel_id.write(writer)?;
3281 (pending_forwards.len() as u64).write(writer)?;
3282 for forward in pending_forwards {
3283 forward.write(writer)?;
3287 (channel_state.claimable_htlcs.len() as u64).write(writer)?;
3288 for (payment_hash, previous_hops) in channel_state.claimable_htlcs.iter() {
3289 payment_hash.write(writer)?;
3290 (previous_hops.len() as u64).write(writer)?;
3291 for &(recvd_amt, ref previous_hop) in previous_hops.iter() {
3292 recvd_amt.write(writer)?;
3293 previous_hop.write(writer)?;
3297 let per_peer_state = self.per_peer_state.write().unwrap();
3298 (per_peer_state.len() as u64).write(writer)?;
3299 for (peer_pubkey, peer_state_mutex) in per_peer_state.iter() {
3300 peer_pubkey.write(writer)?;
3301 let peer_state = peer_state_mutex.lock().unwrap();
3302 peer_state.latest_features.write(writer)?;
3305 (self.last_node_announcement_serial.load(Ordering::Acquire) as u32).write(writer)?;
3311 /// Arguments for the creation of a ChannelManager that are not deserialized.
3313 /// At a high-level, the process for deserializing a ChannelManager and resuming normal operation
3315 /// 1) Deserialize all stored ChannelMonitors.
3316 /// 2) Deserialize the ChannelManager by filling in this struct and calling <(Sha256dHash,
3317 /// ChannelManager)>::read(reader, args).
3318 /// This may result in closing some Channels if the ChannelMonitor is newer than the stored
3319 /// ChannelManager state to ensure no loss of funds. Thus, transactions may be broadcasted.
3320 /// 3) Register all relevant ChannelMonitor outpoints with your chain watch mechanism using
3321 /// ChannelMonitor::get_monitored_outpoints and ChannelMonitor::get_funding_txo().
3322 /// 4) Reconnect blocks on your ChannelMonitors.
3323 /// 5) Move the ChannelMonitors into your local ManyChannelMonitor.
3324 /// 6) Disconnect/connect blocks on the ChannelManager.
3325 /// 7) Register the new ChannelManager with your ChainWatchInterface.
3326 pub struct ChannelManagerReadArgs<'a, ChanSigner: 'a + ChannelKeys, M: Deref, T: Deref, K: Deref, F: Deref>
3327 where M::Target: ManyChannelMonitor<ChanSigner>,
3328 T::Target: BroadcasterInterface,
3329 K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
3330 F::Target: FeeEstimator,
3333 /// The keys provider which will give us relevant keys. Some keys will be loaded during
3334 /// deserialization.
3335 pub keys_manager: K,
3337 /// The fee_estimator for use in the ChannelManager in the future.
3339 /// No calls to the FeeEstimator will be made during deserialization.
3340 pub fee_estimator: F,
3341 /// The ManyChannelMonitor for use in the ChannelManager in the future.
3343 /// No calls to the ManyChannelMonitor will be made during deserialization. It is assumed that
3344 /// you have deserialized ChannelMonitors separately and will add them to your
3345 /// ManyChannelMonitor after deserializing this ChannelManager.
3348 /// The BroadcasterInterface which will be used in the ChannelManager in the future and may be
3349 /// used to broadcast the latest local commitment transactions of channels which must be
3350 /// force-closed during deserialization.
3351 pub tx_broadcaster: T,
3352 /// The Logger for use in the ChannelManager and which may be used to log information during
3353 /// deserialization.
3354 pub logger: Arc<Logger>,
3355 /// Default settings used for new channels. Any existing channels will continue to use the
3356 /// runtime settings which were stored when the ChannelManager was serialized.
3357 pub default_config: UserConfig,
3359 /// A map from channel funding outpoints to ChannelMonitors for those channels (ie
3360 /// value.get_funding_txo() should be the key).
3362 /// If a monitor is inconsistent with the channel state during deserialization the channel will
3363 /// be force-closed using the data in the ChannelMonitor and the channel will be dropped. This
3364 /// is true for missing channels as well. If there is a monitor missing for which we find
3365 /// channel data Err(DecodeError::InvalidValue) will be returned.
3367 /// In such cases the latest local transactions will be sent to the tx_broadcaster included in
3369 pub channel_monitors: &'a mut HashMap<OutPoint, &'a mut ChannelMonitor<ChanSigner>>,
3372 // Implement ReadableArgs for an Arc'd ChannelManager to make it a bit easier to work with the
3373 // SipmleArcChannelManager type:
3374 impl<'a, ChanSigner: ChannelKeys + Readable, M: Deref, T: Deref, K: Deref, F: Deref>
3375 ReadableArgs<ChannelManagerReadArgs<'a, ChanSigner, M, T, K, F>> for (Sha256dHash, Arc<ChannelManager<ChanSigner, M, T, K, F>>)
3376 where M::Target: ManyChannelMonitor<ChanSigner>,
3377 T::Target: BroadcasterInterface,
3378 K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
3379 F::Target: FeeEstimator,
3381 fn read<R: ::std::io::Read>(reader: &mut R, args: ChannelManagerReadArgs<'a, ChanSigner, M, T, K, F>) -> Result<Self, DecodeError> {
3382 let (blockhash, chan_manager) = <(Sha256dHash, ChannelManager<ChanSigner, M, T, K, F>)>::read(reader, args)?;
3383 Ok((blockhash, Arc::new(chan_manager)))
3387 impl<'a, ChanSigner: ChannelKeys + Readable, M: Deref, T: Deref, K: Deref, F: Deref>
3388 ReadableArgs<ChannelManagerReadArgs<'a, ChanSigner, M, T, K, F>> for (Sha256dHash, ChannelManager<ChanSigner, M, T, K, F>)
3389 where M::Target: ManyChannelMonitor<ChanSigner>,
3390 T::Target: BroadcasterInterface,
3391 K::Target: KeysInterface<ChanKeySigner = ChanSigner>,
3392 F::Target: FeeEstimator,
3394 fn read<R: ::std::io::Read>(reader: &mut R, args: ChannelManagerReadArgs<'a, ChanSigner, M, T, K, F>) -> Result<Self, DecodeError> {
3395 let _ver: u8 = Readable::read(reader)?;
3396 let min_ver: u8 = Readable::read(reader)?;
3397 if min_ver > SERIALIZATION_VERSION {
3398 return Err(DecodeError::UnknownVersion);
3401 let genesis_hash: Sha256dHash = Readable::read(reader)?;
3402 let latest_block_height: u32 = Readable::read(reader)?;
3403 let last_block_hash: Sha256dHash = Readable::read(reader)?;
3405 let mut failed_htlcs = Vec::new();
3407 let channel_count: u64 = Readable::read(reader)?;
3408 let mut funding_txo_set = HashSet::with_capacity(cmp::min(channel_count as usize, 128));
3409 let mut by_id = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
3410 let mut short_to_id = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
3411 for _ in 0..channel_count {
3412 let mut channel: Channel<ChanSigner> = ReadableArgs::read(reader, args.logger.clone())?;
3413 if channel.last_block_connected != Default::default() && channel.last_block_connected != last_block_hash {
3414 return Err(DecodeError::InvalidValue);
3417 let funding_txo = channel.get_funding_txo().ok_or(DecodeError::InvalidValue)?;
3418 funding_txo_set.insert(funding_txo.clone());
3419 if let Some(ref mut monitor) = args.channel_monitors.get_mut(&funding_txo) {
3420 if channel.get_cur_local_commitment_transaction_number() < monitor.get_cur_local_commitment_number() ||
3421 channel.get_revoked_remote_commitment_transaction_number() < monitor.get_min_seen_secret() ||
3422 channel.get_cur_remote_commitment_transaction_number() < monitor.get_cur_remote_commitment_number() ||
3423 channel.get_latest_monitor_update_id() > monitor.get_latest_update_id() {
3424 // If the channel is ahead of the monitor, return InvalidValue:
3425 return Err(DecodeError::InvalidValue);
3426 } else if channel.get_cur_local_commitment_transaction_number() > monitor.get_cur_local_commitment_number() ||
3427 channel.get_revoked_remote_commitment_transaction_number() > monitor.get_min_seen_secret() ||
3428 channel.get_cur_remote_commitment_transaction_number() > monitor.get_cur_remote_commitment_number() ||
3429 channel.get_latest_monitor_update_id() < monitor.get_latest_update_id() {
3430 // But if the channel is behind of the monitor, close the channel:
3431 let (_, _, mut new_failed_htlcs) = channel.force_shutdown(true);
3432 failed_htlcs.append(&mut new_failed_htlcs);
3433 monitor.broadcast_latest_local_commitment_txn(&args.tx_broadcaster);
3435 if let Some(short_channel_id) = channel.get_short_channel_id() {
3436 short_to_id.insert(short_channel_id, channel.channel_id());
3438 by_id.insert(channel.channel_id(), channel);
3441 return Err(DecodeError::InvalidValue);
3445 for (ref funding_txo, ref mut monitor) in args.channel_monitors.iter_mut() {
3446 if !funding_txo_set.contains(funding_txo) {
3447 monitor.broadcast_latest_local_commitment_txn(&args.tx_broadcaster);
3451 let forward_htlcs_count: u64 = Readable::read(reader)?;
3452 let mut forward_htlcs = HashMap::with_capacity(cmp::min(forward_htlcs_count as usize, 128));
3453 for _ in 0..forward_htlcs_count {
3454 let short_channel_id = Readable::read(reader)?;
3455 let pending_forwards_count: u64 = Readable::read(reader)?;
3456 let mut pending_forwards = Vec::with_capacity(cmp::min(pending_forwards_count as usize, 128));
3457 for _ in 0..pending_forwards_count {
3458 pending_forwards.push(Readable::read(reader)?);
3460 forward_htlcs.insert(short_channel_id, pending_forwards);
3463 let claimable_htlcs_count: u64 = Readable::read(reader)?;
3464 let mut claimable_htlcs = HashMap::with_capacity(cmp::min(claimable_htlcs_count as usize, 128));
3465 for _ in 0..claimable_htlcs_count {
3466 let payment_hash = Readable::read(reader)?;
3467 let previous_hops_len: u64 = Readable::read(reader)?;
3468 let mut previous_hops = Vec::with_capacity(cmp::min(previous_hops_len as usize, 2));
3469 for _ in 0..previous_hops_len {
3470 previous_hops.push((Readable::read(reader)?, Readable::read(reader)?));
3472 claimable_htlcs.insert(payment_hash, previous_hops);
3475 let peer_count: u64 = Readable::read(reader)?;
3476 let mut per_peer_state = HashMap::with_capacity(cmp::min(peer_count as usize, 128));
3477 for _ in 0..peer_count {
3478 let peer_pubkey = Readable::read(reader)?;
3479 let peer_state = PeerState {
3480 latest_features: Readable::read(reader)?,
3482 per_peer_state.insert(peer_pubkey, Mutex::new(peer_state));
3485 let last_node_announcement_serial: u32 = Readable::read(reader)?;
3487 let channel_manager = ChannelManager {
3489 fee_estimator: args.fee_estimator,
3490 monitor: args.monitor,
3491 tx_broadcaster: args.tx_broadcaster,
3493 latest_block_height: AtomicUsize::new(latest_block_height as usize),
3494 last_block_hash: Mutex::new(last_block_hash),
3495 secp_ctx: Secp256k1::new(),
3497 channel_state: Mutex::new(ChannelHolder {
3502 pending_msg_events: Vec::new(),
3504 our_network_key: args.keys_manager.get_node_secret(),
3506 last_node_announcement_serial: AtomicUsize::new(last_node_announcement_serial as usize),
3508 per_peer_state: RwLock::new(per_peer_state),
3510 pending_events: Mutex::new(Vec::new()),
3511 total_consistency_lock: RwLock::new(()),
3512 keys_manager: args.keys_manager,
3513 logger: args.logger,
3514 default_configuration: args.default_config,
3517 for htlc_source in failed_htlcs.drain(..) {
3518 channel_manager.fail_htlc_backwards_internal(channel_manager.channel_state.lock().unwrap(), htlc_source.0, &htlc_source.1, HTLCFailReason::Reason { failure_code: 0x4000 | 8, data: Vec::new() });
3521 //TODO: Broadcast channel update for closed channels, but only after we've made a
3522 //connection or two.
3524 Ok((last_block_hash.clone(), channel_manager))