1 // This file is Copyright its original authors, visible in version control
4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
7 // You may not use this file except in accordance with one or both of these
10 //! The top-level channel management and payment tracking stuff lives here.
12 //! The ChannelManager is the main chunk of logic implementing the lightning protocol and is
13 //! responsible for tracking which channels are open, HTLCs are in flight and reestablishing those
14 //! upon reconnect to the relevant peer(s).
16 //! It does not manage routing logic (see routing::router::get_route for that) nor does it manage constructing
17 //! on-chain transactions (it only monitors the chain to watch for any force-closes that might
18 //! imply it needs to fail HTLCs/payments/channels it manages).
21 use bitcoin::blockdata::block::BlockHeader;
22 use bitcoin::blockdata::transaction::Transaction;
23 use bitcoin::blockdata::constants::genesis_block;
24 use bitcoin::network::constants::Network;
26 use bitcoin::hashes::{Hash, HashEngine};
27 use bitcoin::hashes::sha256::Hash as Sha256;
28 use bitcoin::hashes::sha256d::Hash as Sha256dHash;
29 use bitcoin::hash_types::{BlockHash, Txid};
31 use bitcoin::secp256k1::{SecretKey,PublicKey};
32 use bitcoin::secp256k1::Secp256k1;
33 use bitcoin::secp256k1::ecdh::SharedSecret;
34 use bitcoin::secp256k1;
37 use chain::{Confirm, ChannelMonitorUpdateErr, Watch, BestBlock};
38 use chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
39 use chain::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateStep, HTLC_FAIL_BACK_BUFFER, CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD_BLOCKS, ANTI_REORG_DELAY, MonitorEvent, CLOSED_CHANNEL_UPDATE_ID};
40 use chain::transaction::{OutPoint, TransactionData};
41 // Since this struct is returned in `list_channels` methods, expose it here in case users want to
42 // construct one themselves.
43 use ln::{inbound_payment, PaymentHash, PaymentPreimage, PaymentSecret};
44 use ln::channel::{Channel, ChannelError, ChannelUpdateStatus, UpdateFulfillCommitFetch};
45 use ln::features::{ChannelTypeFeatures, InitFeatures, NodeFeatures};
46 use routing::router::{PaymentParameters, Route, RouteHop, RoutePath, RouteParameters};
48 use ln::msgs::NetAddress;
50 use ln::msgs::{ChannelMessageHandler, DecodeError, LightningError, MAX_VALUE_MSAT, OptionalField};
52 use chain::keysinterface::{Sign, KeysInterface, KeysManager, InMemorySigner, Recipient};
53 use util::config::UserConfig;
54 use util::events::{EventHandler, EventsProvider, MessageSendEvent, MessageSendEventsProvider, ClosureReason};
55 use util::{byte_utils, events};
56 use util::scid_utils::fake_scid;
57 use util::ser::{BigSize, FixedLengthReader, Readable, ReadableArgs, MaybeReadable, Writeable, Writer, VecWriter};
58 use util::logger::{Level, Logger};
59 use util::errors::APIError;
64 use core::cell::RefCell;
66 use sync::{Arc, Condvar, Mutex, MutexGuard, RwLock, RwLockReadGuard};
67 use core::sync::atomic::{AtomicUsize, Ordering};
68 use core::time::Duration;
71 #[cfg(any(test, feature = "std"))]
72 use std::time::Instant;
73 use util::crypto::sign;
75 // We hold various information about HTLC relay in the HTLC objects in Channel itself:
77 // Upon receipt of an HTLC from a peer, we'll give it a PendingHTLCStatus indicating if it should
78 // forward the HTLC with information it will give back to us when it does so, or if it should Fail
79 // the HTLC with the relevant message for the Channel to handle giving to the remote peer.
81 // Once said HTLC is committed in the Channel, if the PendingHTLCStatus indicated Forward, the
82 // Channel will return the PendingHTLCInfo back to us, and we will create an HTLCForwardInfo
83 // with it to track where it came from (in case of onwards-forward error), waiting a random delay
84 // before we forward it.
86 // We will then use HTLCForwardInfo's PendingHTLCInfo to construct an outbound HTLC, with a
87 // relevant HTLCSource::PreviousHopData filled in to indicate where it came from (which we can use
88 // to either fail-backwards or fulfill the HTLC backwards along the relevant path).
89 // Alternatively, we can fill an outbound HTLC with a HTLCSource::OutboundRoute indicating this is
90 // our payment, which we can use to decode errors or inform the user that the payment was sent.
92 #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
93 pub(super) enum PendingHTLCRouting {
95 onion_packet: msgs::OnionPacket,
96 /// The SCID from the onion that we should forward to. This could be a "real" SCID, an
97 /// outbound SCID alias, or a phantom node SCID.
98 short_channel_id: u64, // This should be NonZero<u64> eventually when we bump MSRV
101 payment_data: msgs::FinalOnionHopData,
102 incoming_cltv_expiry: u32, // Used to track when we should expire pending HTLCs that go unclaimed
103 phantom_shared_secret: Option<[u8; 32]>,
106 payment_preimage: PaymentPreimage,
107 incoming_cltv_expiry: u32, // Used to track when we should expire pending HTLCs that go unclaimed
111 #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
112 pub(super) struct PendingHTLCInfo {
113 pub(super) routing: PendingHTLCRouting,
114 pub(super) incoming_shared_secret: [u8; 32],
115 payment_hash: PaymentHash,
116 pub(super) amt_to_forward: u64,
117 pub(super) outgoing_cltv_value: u32,
120 #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
121 pub(super) enum HTLCFailureMsg {
122 Relay(msgs::UpdateFailHTLC),
123 Malformed(msgs::UpdateFailMalformedHTLC),
126 /// Stores whether we can't forward an HTLC or relevant forwarding info
127 #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
128 pub(super) enum PendingHTLCStatus {
129 Forward(PendingHTLCInfo),
130 Fail(HTLCFailureMsg),
133 pub(super) enum HTLCForwardInfo {
135 forward_info: PendingHTLCInfo,
137 // These fields are produced in `forward_htlcs()` and consumed in
138 // `process_pending_htlc_forwards()` for constructing the
139 // `HTLCSource::PreviousHopData` for failed and forwarded
142 // Note that this may be an outbound SCID alias for the associated channel.
143 prev_short_channel_id: u64,
145 prev_funding_outpoint: OutPoint,
149 err_packet: msgs::OnionErrorPacket,
153 /// Tracks the inbound corresponding to an outbound HTLC
154 #[derive(Clone, Hash, PartialEq, Eq)]
155 pub(crate) struct HTLCPreviousHopData {
156 // Note that this may be an outbound SCID alias for the associated channel.
157 short_channel_id: u64,
159 incoming_packet_shared_secret: [u8; 32],
160 phantom_shared_secret: Option<[u8; 32]>,
162 // This field is consumed by `claim_funds_from_hop()` when updating a force-closed backwards
163 // channel with a preimage provided by the forward channel.
168 /// Indicates this incoming onion payload is for the purpose of paying an invoice.
170 /// This is only here for backwards-compatibility in serialization, in the future it can be
171 /// removed, breaking clients running 0.0.106 and earlier.
172 _legacy_hop_data: msgs::FinalOnionHopData,
174 /// Contains the payer-provided preimage.
175 Spontaneous(PaymentPreimage),
178 /// HTLCs that are to us and can be failed/claimed by the user
179 struct ClaimableHTLC {
180 prev_hop: HTLCPreviousHopData,
182 /// The amount (in msats) of this MPP part
184 onion_payload: OnionPayload,
186 /// The sum total of all MPP parts
190 /// A payment identifier used to uniquely identify a payment to LDK.
191 /// (C-not exported) as we just use [u8; 32] directly
192 #[derive(Hash, Copy, Clone, PartialEq, Eq, Debug)]
193 pub struct PaymentId(pub [u8; 32]);
195 impl Writeable for PaymentId {
196 fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
201 impl Readable for PaymentId {
202 fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
203 let buf: [u8; 32] = Readable::read(r)?;
207 /// Tracks the inbound corresponding to an outbound HTLC
208 #[allow(clippy::derive_hash_xor_eq)] // Our Hash is faithful to the data, we just don't have SecretKey::hash
209 #[derive(Clone, PartialEq, Eq)]
210 pub(crate) enum HTLCSource {
211 PreviousHopData(HTLCPreviousHopData),
214 session_priv: SecretKey,
215 /// Technically we can recalculate this from the route, but we cache it here to avoid
216 /// doing a double-pass on route when we get a failure back
217 first_hop_htlc_msat: u64,
218 payment_id: PaymentId,
219 payment_secret: Option<PaymentSecret>,
220 payment_params: Option<PaymentParameters>,
223 #[allow(clippy::derive_hash_xor_eq)] // Our Hash is faithful to the data, we just don't have SecretKey::hash
224 impl core::hash::Hash for HTLCSource {
225 fn hash<H: core::hash::Hasher>(&self, hasher: &mut H) {
227 HTLCSource::PreviousHopData(prev_hop_data) => {
229 prev_hop_data.hash(hasher);
231 HTLCSource::OutboundRoute { path, session_priv, payment_id, payment_secret, first_hop_htlc_msat, payment_params } => {
234 session_priv[..].hash(hasher);
235 payment_id.hash(hasher);
236 payment_secret.hash(hasher);
237 first_hop_htlc_msat.hash(hasher);
238 payment_params.hash(hasher);
243 #[cfg(not(feature = "grind_signatures"))]
246 pub fn dummy() -> Self {
247 HTLCSource::OutboundRoute {
249 session_priv: SecretKey::from_slice(&[1; 32]).unwrap(),
250 first_hop_htlc_msat: 0,
251 payment_id: PaymentId([2; 32]),
252 payment_secret: None,
253 payment_params: None,
258 #[derive(Clone)] // See Channel::revoke_and_ack for why, tl;dr: Rust bug
259 pub(super) enum HTLCFailReason {
261 err: msgs::OnionErrorPacket,
269 struct ReceiveError {
275 /// Return value for claim_funds_from_hop
276 enum ClaimFundsFromHop {
278 MonitorUpdateFail(PublicKey, MsgHandleErrInternal, Option<u64>),
283 type ShutdownResult = (Option<(OutPoint, ChannelMonitorUpdate)>, Vec<(HTLCSource, PaymentHash)>);
285 /// Error type returned across the channel_state mutex boundary. When an Err is generated for a
286 /// Channel, we generally end up with a ChannelError::Close for which we have to close the channel
287 /// immediately (ie with no further calls on it made). Thus, this step happens inside a
288 /// channel_state lock. We then return the set of things that need to be done outside the lock in
289 /// this struct and call handle_error!() on it.
291 struct MsgHandleErrInternal {
292 err: msgs::LightningError,
293 chan_id: Option<([u8; 32], u64)>, // If Some a channel of ours has been closed
294 shutdown_finish: Option<(ShutdownResult, Option<msgs::ChannelUpdate>)>,
296 impl MsgHandleErrInternal {
298 fn send_err_msg_no_close(err: String, channel_id: [u8; 32]) -> Self {
300 err: LightningError {
302 action: msgs::ErrorAction::SendErrorMessage {
303 msg: msgs::ErrorMessage {
310 shutdown_finish: None,
314 fn ignore_no_close(err: String) -> Self {
316 err: LightningError {
318 action: msgs::ErrorAction::IgnoreError,
321 shutdown_finish: None,
325 fn from_no_close(err: msgs::LightningError) -> Self {
326 Self { err, chan_id: None, shutdown_finish: None }
329 fn from_finish_shutdown(err: String, channel_id: [u8; 32], user_channel_id: u64, shutdown_res: ShutdownResult, channel_update: Option<msgs::ChannelUpdate>) -> Self {
331 err: LightningError {
333 action: msgs::ErrorAction::SendErrorMessage {
334 msg: msgs::ErrorMessage {
340 chan_id: Some((channel_id, user_channel_id)),
341 shutdown_finish: Some((shutdown_res, channel_update)),
345 fn from_chan_no_close(err: ChannelError, channel_id: [u8; 32]) -> Self {
348 ChannelError::Warn(msg) => LightningError {
350 action: msgs::ErrorAction::SendWarningMessage {
351 msg: msgs::WarningMessage {
355 log_level: Level::Warn,
358 ChannelError::Ignore(msg) => LightningError {
360 action: msgs::ErrorAction::IgnoreError,
362 ChannelError::Close(msg) => LightningError {
364 action: msgs::ErrorAction::SendErrorMessage {
365 msg: msgs::ErrorMessage {
371 ChannelError::CloseDelayBroadcast(msg) => LightningError {
373 action: msgs::ErrorAction::SendErrorMessage {
374 msg: msgs::ErrorMessage {
382 shutdown_finish: None,
387 /// We hold back HTLCs we intend to relay for a random interval greater than this (see
388 /// Event::PendingHTLCsForwardable for the API guidelines indicating how long should be waited).
389 /// This provides some limited amount of privacy. Ideally this would range from somewhere like one
390 /// second to 30 seconds, but people expect lightning to be, you know, kinda fast, sadly.
391 const MIN_HTLC_RELAY_HOLDING_CELL_MILLIS: u64 = 100;
393 /// For events which result in both a RevokeAndACK and a CommitmentUpdate, by default they should
394 /// be sent in the order they appear in the return value, however sometimes the order needs to be
395 /// variable at runtime (eg Channel::channel_reestablish needs to re-send messages in the order
396 /// they were originally sent). In those cases, this enum is also returned.
397 #[derive(Clone, PartialEq)]
398 pub(super) enum RAACommitmentOrder {
399 /// Send the CommitmentUpdate messages first
401 /// Send the RevokeAndACK message first
405 // Note this is only exposed in cfg(test):
406 pub(super) struct ChannelHolder<Signer: Sign> {
407 pub(super) by_id: HashMap<[u8; 32], Channel<Signer>>,
408 /// SCIDs (and outbound SCID aliases) to the real channel id. Outbound SCID aliases are added
409 /// here once the channel is available for normal use, with SCIDs being added once the funding
410 /// transaction is confirmed at the channel's required confirmation depth.
411 pub(super) short_to_id: HashMap<u64, [u8; 32]>,
412 /// SCID/SCID Alias -> forward infos. Key of 0 means payments received.
414 /// Note that because we may have an SCID Alias as the key we can have two entries per channel,
415 /// though in practice we probably won't be receiving HTLCs for a channel both via the alias
416 /// and via the classic SCID.
418 /// Note that while this is held in the same mutex as the channels themselves, no consistency
419 /// guarantees are made about the existence of a channel with the short id here, nor the short
420 /// ids in the PendingHTLCInfo!
421 pub(super) forward_htlcs: HashMap<u64, Vec<HTLCForwardInfo>>,
422 /// Map from payment hash to any HTLCs which are to us and can be failed/claimed by the user.
423 /// Note that while this is held in the same mutex as the channels themselves, no consistency
424 /// guarantees are made about the channels given here actually existing anymore by the time you
426 claimable_htlcs: HashMap<PaymentHash, Vec<ClaimableHTLC>>,
427 /// Messages to send to peers - pushed to in the same lock that they are generated in (except
428 /// for broadcast messages, where ordering isn't as strict).
429 pub(super) pending_msg_events: Vec<MessageSendEvent>,
432 /// Events which we process internally but cannot be procsesed immediately at the generation site
433 /// for some reason. They are handled in timer_tick_occurred, so may be processed with
434 /// quite some time lag.
435 enum BackgroundEvent {
436 /// Handle a ChannelMonitorUpdate that closes a channel, broadcasting its current latest holder
437 /// commitment transaction.
438 ClosingMonitorUpdate((OutPoint, ChannelMonitorUpdate)),
441 /// State we hold per-peer. In the future we should put channels in here, but for now we only hold
442 /// the latest Init features we heard from the peer.
444 latest_features: InitFeatures,
447 /// Stores a PaymentSecret and any other data we may need to validate an inbound payment is
448 /// actually ours and not some duplicate HTLC sent to us by a node along the route.
450 /// For users who don't want to bother doing their own payment preimage storage, we also store that
453 /// Note that this struct will be removed entirely soon, in favor of storing no inbound payment data
454 /// and instead encoding it in the payment secret.
455 struct PendingInboundPayment {
456 /// The payment secret that the sender must use for us to accept this payment
457 payment_secret: PaymentSecret,
458 /// Time at which this HTLC expires - blocks with a header time above this value will result in
459 /// this payment being removed.
461 /// Arbitrary identifier the user specifies (or not)
462 user_payment_id: u64,
463 // Other required attributes of the payment, optionally enforced:
464 payment_preimage: Option<PaymentPreimage>,
465 min_value_msat: Option<u64>,
468 /// Stores the session_priv for each part of a payment that is still pending. For versions 0.0.102
469 /// and later, also stores information for retrying the payment.
470 pub(crate) enum PendingOutboundPayment {
472 session_privs: HashSet<[u8; 32]>,
475 session_privs: HashSet<[u8; 32]>,
476 payment_hash: PaymentHash,
477 payment_secret: Option<PaymentSecret>,
478 pending_amt_msat: u64,
479 /// Used to track the fee paid. Only present if the payment was serialized on 0.0.103+.
480 pending_fee_msat: Option<u64>,
481 /// The total payment amount across all paths, used to verify that a retry is not overpaying.
483 /// Our best known block height at the time this payment was initiated.
484 starting_block_height: u32,
486 /// When a pending payment is fulfilled, we continue tracking it until all pending HTLCs have
487 /// been resolved. This ensures we don't look up pending payments in ChannelMonitors on restart
488 /// and add a pending payment that was already fulfilled.
490 session_privs: HashSet<[u8; 32]>,
491 payment_hash: Option<PaymentHash>,
493 /// When a payer gives up trying to retry a payment, they inform us, letting us generate a
494 /// `PaymentFailed` event when all HTLCs have irrevocably failed. This avoids a number of race
495 /// conditions in MPP-aware payment retriers (1), where the possibility of multiple
496 /// `PaymentPathFailed` events with `all_paths_failed` can be pending at once, confusing a
497 /// downstream event handler as to when a payment has actually failed.
499 /// (1) https://github.com/lightningdevkit/rust-lightning/issues/1164
501 session_privs: HashSet<[u8; 32]>,
502 payment_hash: PaymentHash,
506 impl PendingOutboundPayment {
507 fn is_retryable(&self) -> bool {
509 PendingOutboundPayment::Retryable { .. } => true,
513 fn is_fulfilled(&self) -> bool {
515 PendingOutboundPayment::Fulfilled { .. } => true,
519 fn abandoned(&self) -> bool {
521 PendingOutboundPayment::Abandoned { .. } => true,
525 fn get_pending_fee_msat(&self) -> Option<u64> {
527 PendingOutboundPayment::Retryable { pending_fee_msat, .. } => pending_fee_msat.clone(),
532 fn payment_hash(&self) -> Option<PaymentHash> {
534 PendingOutboundPayment::Legacy { .. } => None,
535 PendingOutboundPayment::Retryable { payment_hash, .. } => Some(*payment_hash),
536 PendingOutboundPayment::Fulfilled { payment_hash, .. } => *payment_hash,
537 PendingOutboundPayment::Abandoned { payment_hash, .. } => Some(*payment_hash),
541 fn mark_fulfilled(&mut self) {
542 let mut session_privs = HashSet::new();
543 core::mem::swap(&mut session_privs, match self {
544 PendingOutboundPayment::Legacy { session_privs } |
545 PendingOutboundPayment::Retryable { session_privs, .. } |
546 PendingOutboundPayment::Fulfilled { session_privs, .. } |
547 PendingOutboundPayment::Abandoned { session_privs, .. }
550 let payment_hash = self.payment_hash();
551 *self = PendingOutboundPayment::Fulfilled { session_privs, payment_hash };
554 fn mark_abandoned(&mut self) -> Result<(), ()> {
555 let mut session_privs = HashSet::new();
556 let our_payment_hash;
557 core::mem::swap(&mut session_privs, match self {
558 PendingOutboundPayment::Legacy { .. } |
559 PendingOutboundPayment::Fulfilled { .. } =>
561 PendingOutboundPayment::Retryable { session_privs, payment_hash, .. } |
562 PendingOutboundPayment::Abandoned { session_privs, payment_hash, .. } => {
563 our_payment_hash = *payment_hash;
567 *self = PendingOutboundPayment::Abandoned { session_privs, payment_hash: our_payment_hash };
571 /// panics if path is None and !self.is_fulfilled
572 fn remove(&mut self, session_priv: &[u8; 32], path: Option<&Vec<RouteHop>>) -> bool {
573 let remove_res = match self {
574 PendingOutboundPayment::Legacy { session_privs } |
575 PendingOutboundPayment::Retryable { session_privs, .. } |
576 PendingOutboundPayment::Fulfilled { session_privs, .. } |
577 PendingOutboundPayment::Abandoned { session_privs, .. } => {
578 session_privs.remove(session_priv)
582 if let PendingOutboundPayment::Retryable { ref mut pending_amt_msat, ref mut pending_fee_msat, .. } = self {
583 let path = path.expect("Fulfilling a payment should always come with a path");
584 let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
585 *pending_amt_msat -= path_last_hop.fee_msat;
586 if let Some(fee_msat) = pending_fee_msat.as_mut() {
587 *fee_msat -= path.get_path_fees();
594 fn insert(&mut self, session_priv: [u8; 32], path: &Vec<RouteHop>) -> bool {
595 let insert_res = match self {
596 PendingOutboundPayment::Legacy { session_privs } |
597 PendingOutboundPayment::Retryable { session_privs, .. } => {
598 session_privs.insert(session_priv)
600 PendingOutboundPayment::Fulfilled { .. } => false,
601 PendingOutboundPayment::Abandoned { .. } => false,
604 if let PendingOutboundPayment::Retryable { ref mut pending_amt_msat, ref mut pending_fee_msat, .. } = self {
605 let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
606 *pending_amt_msat += path_last_hop.fee_msat;
607 if let Some(fee_msat) = pending_fee_msat.as_mut() {
608 *fee_msat += path.get_path_fees();
615 fn remaining_parts(&self) -> usize {
617 PendingOutboundPayment::Legacy { session_privs } |
618 PendingOutboundPayment::Retryable { session_privs, .. } |
619 PendingOutboundPayment::Fulfilled { session_privs, .. } |
620 PendingOutboundPayment::Abandoned { session_privs, .. } => {
627 /// SimpleArcChannelManager is useful when you need a ChannelManager with a static lifetime, e.g.
628 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
629 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
630 /// SimpleRefChannelManager is the more appropriate type. Defining these type aliases prevents
631 /// issues such as overly long function definitions. Note that the ChannelManager can take any
632 /// type that implements KeysInterface for its keys manager, but this type alias chooses the
633 /// concrete type of the KeysManager.
635 /// (C-not exported) as Arcs don't make sense in bindings
636 pub type SimpleArcChannelManager<M, T, F, L> = ChannelManager<InMemorySigner, Arc<M>, Arc<T>, Arc<KeysManager>, Arc<F>, Arc<L>>;
638 /// SimpleRefChannelManager is a type alias for a ChannelManager reference, and is the reference
639 /// counterpart to the SimpleArcChannelManager type alias. Use this type by default when you don't
640 /// need a ChannelManager with a static lifetime. You'll need a static lifetime in cases such as
641 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
642 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
643 /// helps with issues such as long function definitions. Note that the ChannelManager can take any
644 /// type that implements KeysInterface for its keys manager, but this type alias chooses the
645 /// concrete type of the KeysManager.
647 /// (C-not exported) as Arcs don't make sense in bindings
648 pub type SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, M, T, F, L> = ChannelManager<InMemorySigner, &'a M, &'b T, &'c KeysManager, &'d F, &'e L>;
650 /// Manager which keeps track of a number of channels and sends messages to the appropriate
651 /// channel, also tracking HTLC preimages and forwarding onion packets appropriately.
653 /// Implements ChannelMessageHandler, handling the multi-channel parts and passing things through
654 /// to individual Channels.
656 /// Implements Writeable to write out all channel state to disk. Implies peer_disconnected() for
657 /// all peers during write/read (though does not modify this instance, only the instance being
658 /// serialized). This will result in any channels which have not yet exchanged funding_created (ie
659 /// called funding_transaction_generated for outbound channels).
661 /// Note that you can be a bit lazier about writing out ChannelManager than you can be with
662 /// ChannelMonitors. With ChannelMonitors you MUST write each monitor update out to disk before
663 /// returning from chain::Watch::watch_/update_channel, with ChannelManagers, writing updates
664 /// happens out-of-band (and will prevent any other ChannelManager operations from occurring during
665 /// the serialization process). If the deserialized version is out-of-date compared to the
666 /// ChannelMonitors passed by reference to read(), those channels will be force-closed based on the
667 /// ChannelMonitor state and no funds will be lost (mod on-chain transaction fees).
669 /// Note that the deserializer is only implemented for (BlockHash, ChannelManager), which
670 /// tells you the last block hash which was block_connect()ed. You MUST rescan any blocks along
671 /// the "reorg path" (ie call block_disconnected() until you get to a common block and then call
672 /// block_connected() to step towards your best block) upon deserialization before using the
675 /// Note that ChannelManager is responsible for tracking liveness of its channels and generating
676 /// ChannelUpdate messages informing peers that the channel is temporarily disabled. To avoid
677 /// spam due to quick disconnection/reconnection, updates are not sent until the channel has been
678 /// offline for a full minute. In order to track this, you must call
679 /// timer_tick_occurred roughly once per minute, though it doesn't have to be perfect.
681 /// Rather than using a plain ChannelManager, it is preferable to use either a SimpleArcChannelManager
682 /// a SimpleRefChannelManager, for conciseness. See their documentation for more details, but
683 /// essentially you should default to using a SimpleRefChannelManager, and use a
684 /// SimpleArcChannelManager when you require a ChannelManager with a static lifetime, such as when
685 /// you're using lightning-net-tokio.
686 pub struct ChannelManager<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
687 where M::Target: chain::Watch<Signer>,
688 T::Target: BroadcasterInterface,
689 K::Target: KeysInterface<Signer = Signer>,
690 F::Target: FeeEstimator,
693 default_configuration: UserConfig,
694 genesis_hash: BlockHash,
700 pub(super) best_block: RwLock<BestBlock>,
702 best_block: RwLock<BestBlock>,
703 secp_ctx: Secp256k1<secp256k1::All>,
705 #[cfg(any(test, feature = "_test_utils"))]
706 pub(super) channel_state: Mutex<ChannelHolder<Signer>>,
707 #[cfg(not(any(test, feature = "_test_utils")))]
708 channel_state: Mutex<ChannelHolder<Signer>>,
710 /// Storage for PaymentSecrets and any requirements on future inbound payments before we will
711 /// expose them to users via a PaymentReceived event. HTLCs which do not meet the requirements
712 /// here are failed when we process them as pending-forwardable-HTLCs, and entries are removed
713 /// after we generate a PaymentReceived upon receipt of all MPP parts or when they time out.
714 /// Locked *after* channel_state.
715 pending_inbound_payments: Mutex<HashMap<PaymentHash, PendingInboundPayment>>,
717 /// The session_priv bytes and retry metadata of outbound payments which are pending resolution.
718 /// The authoritative state of these HTLCs resides either within Channels or ChannelMonitors
719 /// (if the channel has been force-closed), however we track them here to prevent duplicative
720 /// PaymentSent/PaymentPathFailed events. Specifically, in the case of a duplicative
721 /// update_fulfill_htlc message after a reconnect, we may "claim" a payment twice.
722 /// Additionally, because ChannelMonitors are often not re-serialized after connecting block(s)
723 /// which may generate a claim event, we may receive similar duplicate claim/fail MonitorEvents
724 /// after reloading from disk while replaying blocks against ChannelMonitors.
726 /// See `PendingOutboundPayment` documentation for more info.
728 /// Locked *after* channel_state.
729 pending_outbound_payments: Mutex<HashMap<PaymentId, PendingOutboundPayment>>,
731 /// The set of outbound SCID aliases across all our channels, including unconfirmed channels
732 /// and some closed channels which reached a usable state prior to being closed. This is used
733 /// only to avoid duplicates, and is not persisted explicitly to disk, but rebuilt from the
734 /// active channel list on load.
735 outbound_scid_aliases: Mutex<HashSet<u64>>,
737 our_network_key: SecretKey,
738 our_network_pubkey: PublicKey,
740 inbound_payment_key: inbound_payment::ExpandedKey,
742 /// LDK puts the [fake scids] that it generates into namespaces, to identify the type of an
743 /// incoming payment. To make it harder for a third-party to identify the type of a payment,
744 /// we encrypt the namespace identifier using these bytes.
746 /// [fake scids]: crate::util::scid_utils::fake_scid
747 fake_scid_rand_bytes: [u8; 32],
749 /// Used to track the last value sent in a node_announcement "timestamp" field. We ensure this
750 /// value increases strictly since we don't assume access to a time source.
751 last_node_announcement_serial: AtomicUsize,
753 /// The highest block timestamp we've seen, which is usually a good guess at the current time.
754 /// Assuming most miners are generating blocks with reasonable timestamps, this shouldn't be
755 /// very far in the past, and can only ever be up to two hours in the future.
756 highest_seen_timestamp: AtomicUsize,
758 /// The bulk of our storage will eventually be here (channels and message queues and the like).
759 /// If we are connected to a peer we always at least have an entry here, even if no channels
760 /// are currently open with that peer.
761 /// Because adding or removing an entry is rare, we usually take an outer read lock and then
762 /// operate on the inner value freely. Sadly, this prevents parallel operation when opening a
765 /// If also holding `channel_state` lock, must lock `channel_state` prior to `per_peer_state`.
766 per_peer_state: RwLock<HashMap<PublicKey, Mutex<PeerState>>>,
768 pending_events: Mutex<Vec<events::Event>>,
769 pending_background_events: Mutex<Vec<BackgroundEvent>>,
770 /// Used when we have to take a BIG lock to make sure everything is self-consistent.
771 /// Essentially just when we're serializing ourselves out.
772 /// Taken first everywhere where we are making changes before any other locks.
773 /// When acquiring this lock in read mode, rather than acquiring it directly, call
774 /// `PersistenceNotifierGuard::notify_on_drop(..)` and pass the lock to it, to ensure the
775 /// PersistenceNotifier the lock contains sends out a notification when the lock is released.
776 total_consistency_lock: RwLock<()>,
778 persistence_notifier: PersistenceNotifier,
785 /// Chain-related parameters used to construct a new `ChannelManager`.
787 /// Typically, the block-specific parameters are derived from the best block hash for the network,
788 /// as a newly constructed `ChannelManager` will not have created any channels yet. These parameters
789 /// are not needed when deserializing a previously constructed `ChannelManager`.
790 #[derive(Clone, Copy, PartialEq)]
791 pub struct ChainParameters {
792 /// The network for determining the `chain_hash` in Lightning messages.
793 pub network: Network,
795 /// The hash and height of the latest block successfully connected.
797 /// Used to track on-chain channel funding outputs and send payments with reliable timelocks.
798 pub best_block: BestBlock,
801 #[derive(Copy, Clone, PartialEq)]
807 /// Whenever we release the `ChannelManager`'s `total_consistency_lock`, from read mode, it is
808 /// desirable to notify any listeners on `await_persistable_update_timeout`/
809 /// `await_persistable_update` when new updates are available for persistence. Therefore, this
810 /// struct is responsible for locking the total consistency lock and, upon going out of scope,
811 /// sending the aforementioned notification (since the lock being released indicates that the
812 /// updates are ready for persistence).
814 /// We allow callers to either always notify by constructing with `notify_on_drop` or choose to
815 /// notify or not based on whether relevant changes have been made, providing a closure to
816 /// `optionally_notify` which returns a `NotifyOption`.
817 struct PersistenceNotifierGuard<'a, F: Fn() -> NotifyOption> {
818 persistence_notifier: &'a PersistenceNotifier,
820 // We hold onto this result so the lock doesn't get released immediately.
821 _read_guard: RwLockReadGuard<'a, ()>,
824 impl<'a> PersistenceNotifierGuard<'a, fn() -> NotifyOption> { // We don't care what the concrete F is here, it's unused
825 fn notify_on_drop(lock: &'a RwLock<()>, notifier: &'a PersistenceNotifier) -> PersistenceNotifierGuard<'a, impl Fn() -> NotifyOption> {
826 PersistenceNotifierGuard::optionally_notify(lock, notifier, || -> NotifyOption { NotifyOption::DoPersist })
829 fn optionally_notify<F: Fn() -> NotifyOption>(lock: &'a RwLock<()>, notifier: &'a PersistenceNotifier, persist_check: F) -> PersistenceNotifierGuard<'a, F> {
830 let read_guard = lock.read().unwrap();
832 PersistenceNotifierGuard {
833 persistence_notifier: notifier,
834 should_persist: persist_check,
835 _read_guard: read_guard,
840 impl<'a, F: Fn() -> NotifyOption> Drop for PersistenceNotifierGuard<'a, F> {
842 if (self.should_persist)() == NotifyOption::DoPersist {
843 self.persistence_notifier.notify();
848 /// The amount of time in blocks we require our counterparty wait to claim their money (ie time
849 /// between when we, or our watchtower, must check for them having broadcast a theft transaction).
851 /// This can be increased (but not decreased) through [`ChannelHandshakeConfig::our_to_self_delay`]
853 /// [`ChannelHandshakeConfig::our_to_self_delay`]: crate::util::config::ChannelHandshakeConfig::our_to_self_delay
854 pub const BREAKDOWN_TIMEOUT: u16 = 6 * 24;
855 /// The amount of time in blocks we're willing to wait to claim money back to us. This matches
856 /// the maximum required amount in lnd as of March 2021.
857 pub(crate) const MAX_LOCAL_BREAKDOWN_TIMEOUT: u16 = 2 * 6 * 24 * 7;
859 /// The minimum number of blocks between an inbound HTLC's CLTV and the corresponding outbound
860 /// HTLC's CLTV. The current default represents roughly seven hours of blocks at six blocks/hour.
862 /// This can be increased (but not decreased) through [`ChannelConfig::cltv_expiry_delta`]
864 /// [`ChannelConfig::cltv_expiry_delta`]: crate::util::config::ChannelConfig::cltv_expiry_delta
865 // This should always be a few blocks greater than channelmonitor::CLTV_CLAIM_BUFFER,
866 // i.e. the node we forwarded the payment on to should always have enough room to reliably time out
867 // the HTLC via a full update_fail_htlc/commitment_signed dance before we hit the
868 // CLTV_CLAIM_BUFFER point (we static assert that it's at least 3 blocks more).
869 pub const MIN_CLTV_EXPIRY_DELTA: u16 = 6*7;
870 pub(super) const CLTV_FAR_FAR_AWAY: u32 = 6 * 24 * 7; //TODO?
872 /// Minimum CLTV difference between the current block height and received inbound payments.
873 /// Invoices generated for payment to us must set their `min_final_cltv_expiry` field to at least
875 // Note that we fail if exactly HTLC_FAIL_BACK_BUFFER + 1 was used, so we need to add one for
876 // any payments to succeed. Further, we don't want payments to fail if a block was found while
877 // a payment was being routed, so we add an extra block to be safe.
878 pub const MIN_FINAL_CLTV_EXPIRY: u32 = HTLC_FAIL_BACK_BUFFER + 3;
880 // Check that our CLTV_EXPIRY is at least CLTV_CLAIM_BUFFER + ANTI_REORG_DELAY + LATENCY_GRACE_PERIOD_BLOCKS,
881 // ie that if the next-hop peer fails the HTLC within
882 // LATENCY_GRACE_PERIOD_BLOCKS then we'll still have CLTV_CLAIM_BUFFER left to timeout it onchain,
883 // then waiting ANTI_REORG_DELAY to be reorg-safe on the outbound HLTC and
884 // failing the corresponding htlc backward, and us now seeing the last block of ANTI_REORG_DELAY before
885 // LATENCY_GRACE_PERIOD_BLOCKS.
888 const CHECK_CLTV_EXPIRY_SANITY: u32 = MIN_CLTV_EXPIRY_DELTA as u32 - LATENCY_GRACE_PERIOD_BLOCKS - CLTV_CLAIM_BUFFER - ANTI_REORG_DELAY - LATENCY_GRACE_PERIOD_BLOCKS;
890 // Check for ability of an attacker to make us fail on-chain by delaying an HTLC claim. See
891 // ChannelMonitor::should_broadcast_holder_commitment_txn for a description of why this is needed.
894 const CHECK_CLTV_EXPIRY_SANITY_2: u32 = MIN_CLTV_EXPIRY_DELTA as u32 - LATENCY_GRACE_PERIOD_BLOCKS - 2*CLTV_CLAIM_BUFFER;
896 /// The number of blocks before we consider an outbound payment for expiry if it doesn't have any
897 /// pending HTLCs in flight.
898 pub(crate) const PAYMENT_EXPIRY_BLOCKS: u32 = 3;
900 /// The number of ticks of [`ChannelManager::timer_tick_occurred`] until expiry of incomplete MPPs
901 pub(crate) const MPP_TIMEOUT_TICKS: u8 = 3;
903 /// Information needed for constructing an invoice route hint for this channel.
904 #[derive(Clone, Debug, PartialEq)]
905 pub struct CounterpartyForwardingInfo {
906 /// Base routing fee in millisatoshis.
907 pub fee_base_msat: u32,
908 /// Amount in millionths of a satoshi the channel will charge per transferred satoshi.
909 pub fee_proportional_millionths: u32,
910 /// The minimum difference in cltv_expiry between an ingoing HTLC and its outgoing counterpart,
911 /// such that the outgoing HTLC is forwardable to this counterparty. See `msgs::ChannelUpdate`'s
912 /// `cltv_expiry_delta` for more details.
913 pub cltv_expiry_delta: u16,
916 /// Channel parameters which apply to our counterparty. These are split out from [`ChannelDetails`]
917 /// to better separate parameters.
918 #[derive(Clone, Debug, PartialEq)]
919 pub struct ChannelCounterparty {
920 /// The node_id of our counterparty
921 pub node_id: PublicKey,
922 /// The Features the channel counterparty provided upon last connection.
923 /// Useful for routing as it is the most up-to-date copy of the counterparty's features and
924 /// many routing-relevant features are present in the init context.
925 pub features: InitFeatures,
926 /// The value, in satoshis, that must always be held in the channel for our counterparty. This
927 /// value ensures that if our counterparty broadcasts a revoked state, we can punish them by
928 /// claiming at least this value on chain.
930 /// This value is not included in [`inbound_capacity_msat`] as it can never be spent.
932 /// [`inbound_capacity_msat`]: ChannelDetails::inbound_capacity_msat
933 pub unspendable_punishment_reserve: u64,
934 /// Information on the fees and requirements that the counterparty requires when forwarding
935 /// payments to us through this channel.
936 pub forwarding_info: Option<CounterpartyForwardingInfo>,
937 /// The smallest value HTLC (in msat) the remote peer will accept, for this channel. This field
938 /// is only `None` before we have received either the `OpenChannel` or `AcceptChannel` message
939 /// from the remote peer, or for `ChannelCounterparty` objects serialized prior to LDK 0.0.107.
940 pub outbound_htlc_minimum_msat: Option<u64>,
941 /// The largest value HTLC (in msat) the remote peer currently will accept, for this channel.
942 pub outbound_htlc_maximum_msat: Option<u64>,
945 /// Details of a channel, as returned by ChannelManager::list_channels and ChannelManager::list_usable_channels
946 #[derive(Clone, Debug, PartialEq)]
947 pub struct ChannelDetails {
948 /// The channel's ID (prior to funding transaction generation, this is a random 32 bytes,
949 /// thereafter this is the txid of the funding transaction xor the funding transaction output).
950 /// Note that this means this value is *not* persistent - it can change once during the
951 /// lifetime of the channel.
952 pub channel_id: [u8; 32],
953 /// Parameters which apply to our counterparty. See individual fields for more information.
954 pub counterparty: ChannelCounterparty,
955 /// The Channel's funding transaction output, if we've negotiated the funding transaction with
956 /// our counterparty already.
958 /// Note that, if this has been set, `channel_id` will be equivalent to
959 /// `funding_txo.unwrap().to_channel_id()`.
960 pub funding_txo: Option<OutPoint>,
961 /// The features which this channel operates with. See individual features for more info.
963 /// `None` until negotiation completes and the channel type is finalized.
964 pub channel_type: Option<ChannelTypeFeatures>,
965 /// The position of the funding transaction in the chain. None if the funding transaction has
966 /// not yet been confirmed and the channel fully opened.
968 /// Note that if [`inbound_scid_alias`] is set, it must be used for invoices and inbound
969 /// payments instead of this. See [`get_inbound_payment_scid`].
971 /// [`inbound_scid_alias`]: Self::inbound_scid_alias
972 /// [`get_inbound_payment_scid`]: Self::get_inbound_payment_scid
973 pub short_channel_id: Option<u64>,
974 /// An optional [`short_channel_id`] alias for this channel, randomly generated by our
975 /// counterparty and usable in place of [`short_channel_id`] in invoice route hints. Our
976 /// counterparty will recognize the alias provided here in place of the [`short_channel_id`]
977 /// when they see a payment to be routed to us.
979 /// Our counterparty may choose to rotate this value at any time, though will always recognize
980 /// previous values for inbound payment forwarding.
982 /// [`short_channel_id`]: Self::short_channel_id
983 pub inbound_scid_alias: Option<u64>,
984 /// The value, in satoshis, of this channel as appears in the funding output
985 pub channel_value_satoshis: u64,
986 /// The value, in satoshis, that must always be held in the channel for us. This value ensures
987 /// that if we broadcast a revoked state, our counterparty can punish us by claiming at least
988 /// this value on chain.
990 /// This value is not included in [`outbound_capacity_msat`] as it can never be spent.
992 /// This value will be `None` for outbound channels until the counterparty accepts the channel.
994 /// [`outbound_capacity_msat`]: ChannelDetails::outbound_capacity_msat
995 pub unspendable_punishment_reserve: Option<u64>,
996 /// The `user_channel_id` passed in to create_channel, or 0 if the channel was inbound.
997 pub user_channel_id: u64,
998 /// Our total balance. This is the amount we would get if we close the channel.
999 /// This value is not exact. Due to various in-flight changes and feerate changes, exactly this
1000 /// amount is not likely to be recoverable on close.
1002 /// This does not include any pending HTLCs which are not yet fully resolved (and, thus, whose
1003 /// balance is not available for inclusion in new outbound HTLCs). This further does not include
1004 /// any pending outgoing HTLCs which are awaiting some other resolution to be sent.
1005 /// This does not consider any on-chain fees.
1007 /// See also [`ChannelDetails::outbound_capacity_msat`]
1008 pub balance_msat: u64,
1009 /// The available outbound capacity for sending HTLCs to the remote peer. This does not include
1010 /// any pending HTLCs which are not yet fully resolved (and, thus, whose balance is not
1011 /// available for inclusion in new outbound HTLCs). This further does not include any pending
1012 /// outgoing HTLCs which are awaiting some other resolution to be sent.
1014 /// See also [`ChannelDetails::balance_msat`]
1016 /// This value is not exact. Due to various in-flight changes, feerate changes, and our
1017 /// conflict-avoidance policy, exactly this amount is not likely to be spendable. However, we
1018 /// should be able to spend nearly this amount.
1019 pub outbound_capacity_msat: u64,
1020 /// The available outbound capacity for sending a single HTLC to the remote peer. This is
1021 /// similar to [`ChannelDetails::outbound_capacity_msat`] but it may be further restricted by
1022 /// the current state and per-HTLC limit(s). This is intended for use when routing, allowing us
1023 /// to use a limit as close as possible to the HTLC limit we can currently send.
1025 /// See also [`ChannelDetails::balance_msat`] and [`ChannelDetails::outbound_capacity_msat`].
1026 pub next_outbound_htlc_limit_msat: u64,
1027 /// The available inbound capacity for the remote peer to send HTLCs to us. This does not
1028 /// include any pending HTLCs which are not yet fully resolved (and, thus, whose balance is not
1029 /// available for inclusion in new inbound HTLCs).
1030 /// Note that there are some corner cases not fully handled here, so the actual available
1031 /// inbound capacity may be slightly higher than this.
1033 /// This value is not exact. Due to various in-flight changes, feerate changes, and our
1034 /// counterparty's conflict-avoidance policy, exactly this amount is not likely to be spendable.
1035 /// However, our counterparty should be able to spend nearly this amount.
1036 pub inbound_capacity_msat: u64,
1037 /// The number of required confirmations on the funding transaction before the funding will be
1038 /// considered "locked". This number is selected by the channel fundee (i.e. us if
1039 /// [`is_outbound`] is *not* set), and can be selected for inbound channels with
1040 /// [`ChannelHandshakeConfig::minimum_depth`] or limited for outbound channels with
1041 /// [`ChannelHandshakeLimits::max_minimum_depth`].
1043 /// This value will be `None` for outbound channels until the counterparty accepts the channel.
1045 /// [`is_outbound`]: ChannelDetails::is_outbound
1046 /// [`ChannelHandshakeConfig::minimum_depth`]: crate::util::config::ChannelHandshakeConfig::minimum_depth
1047 /// [`ChannelHandshakeLimits::max_minimum_depth`]: crate::util::config::ChannelHandshakeLimits::max_minimum_depth
1048 pub confirmations_required: Option<u32>,
1049 /// The number of blocks (after our commitment transaction confirms) that we will need to wait
1050 /// until we can claim our funds after we force-close the channel. During this time our
1051 /// counterparty is allowed to punish us if we broadcasted a stale state. If our counterparty
1052 /// force-closes the channel and broadcasts a commitment transaction we do not have to wait any
1053 /// time to claim our non-HTLC-encumbered funds.
1055 /// This value will be `None` for outbound channels until the counterparty accepts the channel.
1056 pub force_close_spend_delay: Option<u16>,
1057 /// True if the channel was initiated (and thus funded) by us.
1058 pub is_outbound: bool,
1059 /// True if the channel is confirmed, funding_locked messages have been exchanged, and the
1060 /// channel is not currently being shut down. `funding_locked` message exchange implies the
1061 /// required confirmation count has been reached (and we were connected to the peer at some
1062 /// point after the funding transaction received enough confirmations). The required
1063 /// confirmation count is provided in [`confirmations_required`].
1065 /// [`confirmations_required`]: ChannelDetails::confirmations_required
1066 pub is_funding_locked: bool,
1067 /// True if the channel is (a) confirmed and funding_locked messages have been exchanged, (b)
1068 /// the peer is connected, and (c) the channel is not currently negotiating a shutdown.
1070 /// This is a strict superset of `is_funding_locked`.
1071 pub is_usable: bool,
1072 /// True if this channel is (or will be) publicly-announced.
1073 pub is_public: bool,
1074 /// The smallest value HTLC (in msat) we will accept, for this channel. This field
1075 /// is only `None` for `ChannelDetails` objects serialized prior to LDK 0.0.107
1076 pub inbound_htlc_minimum_msat: Option<u64>,
1077 /// The largest value HTLC (in msat) we currently will accept, for this channel.
1078 pub inbound_htlc_maximum_msat: Option<u64>,
1081 impl ChannelDetails {
1082 /// Gets the current SCID which should be used to identify this channel for inbound payments.
1083 /// This should be used for providing invoice hints or in any other context where our
1084 /// counterparty will forward a payment to us.
1086 /// This is either the [`ChannelDetails::inbound_scid_alias`], if set, or the
1087 /// [`ChannelDetails::short_channel_id`]. See those for more information.
1088 pub fn get_inbound_payment_scid(&self) -> Option<u64> {
1089 self.inbound_scid_alias.or(self.short_channel_id)
1093 /// If a payment fails to send, it can be in one of several states. This enum is returned as the
1094 /// Err() type describing which state the payment is in, see the description of individual enum
1095 /// states for more.
1096 #[derive(Clone, Debug)]
1097 pub enum PaymentSendFailure {
1098 /// A parameter which was passed to send_payment was invalid, preventing us from attempting to
1099 /// send the payment at all. No channel state has been changed or messages sent to peers, and
1100 /// once you've changed the parameter at error, you can freely retry the payment in full.
1101 ParameterError(APIError),
1102 /// A parameter in a single path which was passed to send_payment was invalid, preventing us
1103 /// from attempting to send the payment at all. No channel state has been changed or messages
1104 /// sent to peers, and once you've changed the parameter at error, you can freely retry the
1105 /// payment in full.
1107 /// The results here are ordered the same as the paths in the route object which was passed to
1109 PathParameterError(Vec<Result<(), APIError>>),
1110 /// All paths which were attempted failed to send, with no channel state change taking place.
1111 /// You can freely retry the payment in full (though you probably want to do so over different
1112 /// paths than the ones selected).
1113 AllFailedRetrySafe(Vec<APIError>),
1114 /// Some paths which were attempted failed to send, though possibly not all. At least some
1115 /// paths have irrevocably committed to the HTLC and retrying the payment in full would result
1116 /// in over-/re-payment.
1118 /// The results here are ordered the same as the paths in the route object which was passed to
1119 /// send_payment, and any Errs which are not APIError::MonitorUpdateFailed can be safely
1120 /// retried (though there is currently no API with which to do so).
1122 /// Any entries which contain Err(APIError::MonitorUpdateFailed) or Ok(()) MUST NOT be retried
1123 /// as they will result in over-/re-payment. These HTLCs all either successfully sent (in the
1124 /// case of Ok(())) or will send once channel_monitor_updated is called on the next-hop channel
1125 /// with the latest update_id.
1127 /// The errors themselves, in the same order as the route hops.
1128 results: Vec<Result<(), APIError>>,
1129 /// If some paths failed without irrevocably committing to the new HTLC(s), this will
1130 /// contain a [`RouteParameters`] object which can be used to calculate a new route that
1131 /// will pay all remaining unpaid balance.
1132 failed_paths_retry: Option<RouteParameters>,
1133 /// The payment id for the payment, which is now at least partially pending.
1134 payment_id: PaymentId,
1138 /// Route hints used in constructing invoices for [phantom node payents].
1140 /// [phantom node payments]: crate::chain::keysinterface::PhantomKeysManager
1142 pub struct PhantomRouteHints {
1143 /// The list of channels to be included in the invoice route hints.
1144 pub channels: Vec<ChannelDetails>,
1145 /// A fake scid used for representing the phantom node's fake channel in generating the invoice
1147 pub phantom_scid: u64,
1148 /// The pubkey of the real backing node that would ultimately receive the payment.
1149 pub real_node_pubkey: PublicKey,
1152 macro_rules! handle_error {
1153 ($self: ident, $internal: expr, $counterparty_node_id: expr) => {
1156 Err(MsgHandleErrInternal { err, chan_id, shutdown_finish }) => {
1157 #[cfg(debug_assertions)]
1159 // In testing, ensure there are no deadlocks where the lock is already held upon
1160 // entering the macro.
1161 assert!($self.channel_state.try_lock().is_ok());
1162 assert!($self.pending_events.try_lock().is_ok());
1165 let mut msg_events = Vec::with_capacity(2);
1167 if let Some((shutdown_res, update_option)) = shutdown_finish {
1168 $self.finish_force_close_channel(shutdown_res);
1169 if let Some(update) = update_option {
1170 msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
1174 if let Some((channel_id, user_channel_id)) = chan_id {
1175 $self.pending_events.lock().unwrap().push(events::Event::ChannelClosed {
1176 channel_id, user_channel_id,
1177 reason: ClosureReason::ProcessingError { err: err.err.clone() }
1182 log_error!($self.logger, "{}", err.err);
1183 if let msgs::ErrorAction::IgnoreError = err.action {
1185 msg_events.push(events::MessageSendEvent::HandleError {
1186 node_id: $counterparty_node_id,
1187 action: err.action.clone()
1191 if !msg_events.is_empty() {
1192 $self.channel_state.lock().unwrap().pending_msg_events.append(&mut msg_events);
1195 // Return error in case higher-API need one
1202 macro_rules! update_maps_on_chan_removal {
1203 ($self: expr, $short_to_id: expr, $channel: expr) => {
1204 if let Some(short_id) = $channel.get_short_channel_id() {
1205 $short_to_id.remove(&short_id);
1207 // If the channel was never confirmed on-chain prior to its closure, remove the
1208 // outbound SCID alias we used for it from the collision-prevention set. While we
1209 // generally want to avoid ever re-using an outbound SCID alias across all channels, we
1210 // also don't want a counterparty to be able to trivially cause a memory leak by simply
1211 // opening a million channels with us which are closed before we ever reach the funding
1213 let alias_removed = $self.outbound_scid_aliases.lock().unwrap().remove(&$channel.outbound_scid_alias());
1214 debug_assert!(alias_removed);
1216 $short_to_id.remove(&$channel.outbound_scid_alias());
1220 /// Returns (boolean indicating if we should remove the Channel object from memory, a mapped error)
1221 macro_rules! convert_chan_err {
1222 ($self: ident, $err: expr, $short_to_id: expr, $channel: expr, $channel_id: expr) => {
1224 ChannelError::Warn(msg) => {
1225 (false, MsgHandleErrInternal::from_chan_no_close(ChannelError::Warn(msg), $channel_id.clone()))
1227 ChannelError::Ignore(msg) => {
1228 (false, MsgHandleErrInternal::from_chan_no_close(ChannelError::Ignore(msg), $channel_id.clone()))
1230 ChannelError::Close(msg) => {
1231 log_error!($self.logger, "Closing channel {} due to close-required error: {}", log_bytes!($channel_id[..]), msg);
1232 update_maps_on_chan_removal!($self, $short_to_id, $channel);
1233 let shutdown_res = $channel.force_shutdown(true);
1234 (true, MsgHandleErrInternal::from_finish_shutdown(msg, *$channel_id, $channel.get_user_id(),
1235 shutdown_res, $self.get_channel_update_for_broadcast(&$channel).ok()))
1237 ChannelError::CloseDelayBroadcast(msg) => {
1238 log_error!($self.logger, "Channel {} need to be shutdown but closing transactions not broadcast due to {}", log_bytes!($channel_id[..]), msg);
1239 update_maps_on_chan_removal!($self, $short_to_id, $channel);
1240 let shutdown_res = $channel.force_shutdown(false);
1241 (true, MsgHandleErrInternal::from_finish_shutdown(msg, *$channel_id, $channel.get_user_id(),
1242 shutdown_res, $self.get_channel_update_for_broadcast(&$channel).ok()))
1248 macro_rules! break_chan_entry {
1249 ($self: ident, $res: expr, $channel_state: expr, $entry: expr) => {
1253 let (drop, res) = convert_chan_err!($self, e, $channel_state.short_to_id, $entry.get_mut(), $entry.key());
1255 $entry.remove_entry();
1263 macro_rules! try_chan_entry {
1264 ($self: ident, $res: expr, $channel_state: expr, $entry: expr) => {
1268 let (drop, res) = convert_chan_err!($self, e, $channel_state.short_to_id, $entry.get_mut(), $entry.key());
1270 $entry.remove_entry();
1278 macro_rules! remove_channel {
1279 ($self: expr, $channel_state: expr, $entry: expr) => {
1281 let channel = $entry.remove_entry().1;
1282 update_maps_on_chan_removal!($self, $channel_state.short_to_id, channel);
1288 macro_rules! handle_monitor_err {
1289 ($self: ident, $err: expr, $short_to_id: expr, $chan: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr, $resend_funding_locked: expr, $failed_forwards: expr, $failed_fails: expr, $failed_finalized_fulfills: expr, $chan_id: expr) => {
1291 ChannelMonitorUpdateErr::PermanentFailure => {
1292 log_error!($self.logger, "Closing channel {} due to monitor update ChannelMonitorUpdateErr::PermanentFailure", log_bytes!($chan_id[..]));
1293 update_maps_on_chan_removal!($self, $short_to_id, $chan);
1294 // TODO: $failed_fails is dropped here, which will cause other channels to hit the
1295 // chain in a confused state! We need to move them into the ChannelMonitor which
1296 // will be responsible for failing backwards once things confirm on-chain.
1297 // It's ok that we drop $failed_forwards here - at this point we'd rather they
1298 // broadcast HTLC-Timeout and pay the associated fees to get their funds back than
1299 // us bother trying to claim it just to forward on to another peer. If we're
1300 // splitting hairs we'd prefer to claim payments that were to us, but we haven't
1301 // given up the preimage yet, so might as well just wait until the payment is
1302 // retried, avoiding the on-chain fees.
1303 let res: Result<(), _> = Err(MsgHandleErrInternal::from_finish_shutdown("ChannelMonitor storage failure".to_owned(), *$chan_id, $chan.get_user_id(),
1304 $chan.force_shutdown(true), $self.get_channel_update_for_broadcast(&$chan).ok() ));
1307 ChannelMonitorUpdateErr::TemporaryFailure => {
1308 log_info!($self.logger, "Disabling channel {} due to monitor update TemporaryFailure. On restore will send {} and process {} forwards, {} fails, and {} fulfill finalizations",
1309 log_bytes!($chan_id[..]),
1310 if $resend_commitment && $resend_raa {
1311 match $action_type {
1312 RAACommitmentOrder::CommitmentFirst => { "commitment then RAA" },
1313 RAACommitmentOrder::RevokeAndACKFirst => { "RAA then commitment" },
1315 } else if $resend_commitment { "commitment" }
1316 else if $resend_raa { "RAA" }
1318 (&$failed_forwards as &Vec<(PendingHTLCInfo, u64)>).len(),
1319 (&$failed_fails as &Vec<(HTLCSource, PaymentHash, HTLCFailReason)>).len(),
1320 (&$failed_finalized_fulfills as &Vec<HTLCSource>).len());
1321 if !$resend_commitment {
1322 debug_assert!($action_type == RAACommitmentOrder::RevokeAndACKFirst || !$resend_raa);
1325 debug_assert!($action_type == RAACommitmentOrder::CommitmentFirst || !$resend_commitment);
1327 $chan.monitor_update_failed($resend_raa, $resend_commitment, $resend_funding_locked, $failed_forwards, $failed_fails, $failed_finalized_fulfills);
1328 (Err(MsgHandleErrInternal::from_chan_no_close(ChannelError::Ignore("Failed to update ChannelMonitor".to_owned()), *$chan_id)), false)
1332 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr, $resend_funding_locked: expr, $failed_forwards: expr, $failed_fails: expr, $failed_finalized_fulfills: expr) => { {
1333 let (res, drop) = handle_monitor_err!($self, $err, $channel_state.short_to_id, $entry.get_mut(), $action_type, $resend_raa, $resend_commitment, $resend_funding_locked, $failed_forwards, $failed_fails, $failed_finalized_fulfills, $entry.key());
1335 $entry.remove_entry();
1339 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $chan_id: expr, COMMITMENT_UPDATE_ONLY) => { {
1340 debug_assert!($action_type == RAACommitmentOrder::CommitmentFirst);
1341 handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, false, true, false, Vec::new(), Vec::new(), Vec::new(), $chan_id)
1343 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $chan_id: expr, NO_UPDATE) => {
1344 handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, false, false, false, Vec::new(), Vec::new(), Vec::new(), $chan_id)
1346 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_funding_locked: expr, OPTIONALLY_RESEND_FUNDING_LOCKED) => {
1347 handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, false, false, $resend_funding_locked, Vec::new(), Vec::new(), Vec::new())
1349 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr) => {
1350 handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, $resend_raa, $resend_commitment, false, Vec::new(), Vec::new(), Vec::new())
1352 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr, $failed_forwards: expr, $failed_fails: expr) => {
1353 handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, $resend_raa, $resend_commitment, false, $failed_forwards, $failed_fails, Vec::new())
1357 macro_rules! return_monitor_err {
1358 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr) => {
1359 return handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, $resend_raa, $resend_commitment);
1361 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr, $failed_forwards: expr, $failed_fails: expr) => {
1362 return handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, $resend_raa, $resend_commitment, $failed_forwards, $failed_fails);
1366 // Does not break in case of TemporaryFailure!
1367 macro_rules! maybe_break_monitor_err {
1368 ($self: ident, $err: expr, $channel_state: expr, $entry: expr, $action_type: path, $resend_raa: expr, $resend_commitment: expr) => {
1369 match (handle_monitor_err!($self, $err, $channel_state, $entry, $action_type, $resend_raa, $resend_commitment), $err) {
1370 (e, ChannelMonitorUpdateErr::PermanentFailure) => {
1373 (_, ChannelMonitorUpdateErr::TemporaryFailure) => { },
1378 macro_rules! send_funding_locked {
1379 ($short_to_id: expr, $pending_msg_events: expr, $channel: expr, $funding_locked_msg: expr) => {
1380 $pending_msg_events.push(events::MessageSendEvent::SendFundingLocked {
1381 node_id: $channel.get_counterparty_node_id(),
1382 msg: $funding_locked_msg,
1384 // Note that we may send a funding locked multiple times for a channel if we reconnect, so
1385 // we allow collisions, but we shouldn't ever be updating the channel ID pointed to.
1386 let outbound_alias_insert = $short_to_id.insert($channel.outbound_scid_alias(), $channel.channel_id());
1387 assert!(outbound_alias_insert.is_none() || outbound_alias_insert.unwrap() == $channel.channel_id(),
1388 "SCIDs should never collide - ensure you weren't behind the chain tip by a full month when creating channels");
1389 if let Some(real_scid) = $channel.get_short_channel_id() {
1390 let scid_insert = $short_to_id.insert(real_scid, $channel.channel_id());
1391 assert!(scid_insert.is_none() || scid_insert.unwrap() == $channel.channel_id(),
1392 "SCIDs should never collide - ensure you weren't behind the chain tip by a full month when creating channels");
1397 macro_rules! handle_chan_restoration_locked {
1398 ($self: ident, $channel_lock: expr, $channel_state: expr, $channel_entry: expr,
1399 $raa: expr, $commitment_update: expr, $order: expr, $chanmon_update: expr,
1400 $pending_forwards: expr, $funding_broadcastable: expr, $funding_locked: expr, $announcement_sigs: expr) => { {
1401 let mut htlc_forwards = None;
1403 let chanmon_update: Option<ChannelMonitorUpdate> = $chanmon_update; // Force type-checking to resolve
1404 let chanmon_update_is_none = chanmon_update.is_none();
1405 let counterparty_node_id = $channel_entry.get().get_counterparty_node_id();
1407 let forwards: Vec<(PendingHTLCInfo, u64)> = $pending_forwards; // Force type-checking to resolve
1408 if !forwards.is_empty() {
1409 htlc_forwards = Some(($channel_entry.get().get_short_channel_id().unwrap_or($channel_entry.get().outbound_scid_alias()),
1410 $channel_entry.get().get_funding_txo().unwrap(), forwards));
1413 if chanmon_update.is_some() {
1414 // On reconnect, we, by definition, only resend a funding_locked if there have been
1415 // no commitment updates, so the only channel monitor update which could also be
1416 // associated with a funding_locked would be the funding_created/funding_signed
1417 // monitor update. That monitor update failing implies that we won't send
1418 // funding_locked until it's been updated, so we can't have a funding_locked and a
1419 // monitor update here (so we don't bother to handle it correctly below).
1420 assert!($funding_locked.is_none());
1421 // A channel monitor update makes no sense without either a funding_locked or a
1422 // commitment update to process after it. Since we can't have a funding_locked, we
1423 // only bother to handle the monitor-update + commitment_update case below.
1424 assert!($commitment_update.is_some());
1427 if let Some(msg) = $funding_locked {
1428 // Similar to the above, this implies that we're letting the funding_locked fly
1429 // before it should be allowed to.
1430 assert!(chanmon_update.is_none());
1431 send_funding_locked!($channel_state.short_to_id, $channel_state.pending_msg_events, $channel_entry.get(), msg);
1433 if let Some(msg) = $announcement_sigs {
1434 $channel_state.pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
1435 node_id: counterparty_node_id,
1440 let funding_broadcastable: Option<Transaction> = $funding_broadcastable; // Force type-checking to resolve
1441 if let Some(monitor_update) = chanmon_update {
1442 // We only ever broadcast a funding transaction in response to a funding_signed
1443 // message and the resulting monitor update. Thus, on channel_reestablish
1444 // message handling we can't have a funding transaction to broadcast. When
1445 // processing a monitor update finishing resulting in a funding broadcast, we
1446 // cannot have a second monitor update, thus this case would indicate a bug.
1447 assert!(funding_broadcastable.is_none());
1448 // Given we were just reconnected or finished updating a channel monitor, the
1449 // only case where we can get a new ChannelMonitorUpdate would be if we also
1450 // have some commitment updates to send as well.
1451 assert!($commitment_update.is_some());
1452 if let Err(e) = $self.chain_monitor.update_channel($channel_entry.get().get_funding_txo().unwrap(), monitor_update) {
1453 // channel_reestablish doesn't guarantee the order it returns is sensical
1454 // for the messages it returns, but if we're setting what messages to
1455 // re-transmit on monitor update success, we need to make sure it is sane.
1456 let mut order = $order;
1458 order = RAACommitmentOrder::CommitmentFirst;
1460 break handle_monitor_err!($self, e, $channel_state, $channel_entry, order, $raa.is_some(), true);
1464 macro_rules! handle_cs { () => {
1465 if let Some(update) = $commitment_update {
1466 $channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
1467 node_id: counterparty_node_id,
1472 macro_rules! handle_raa { () => {
1473 if let Some(revoke_and_ack) = $raa {
1474 $channel_state.pending_msg_events.push(events::MessageSendEvent::SendRevokeAndACK {
1475 node_id: counterparty_node_id,
1476 msg: revoke_and_ack,
1481 RAACommitmentOrder::CommitmentFirst => {
1485 RAACommitmentOrder::RevokeAndACKFirst => {
1490 if let Some(tx) = funding_broadcastable {
1491 log_info!($self.logger, "Broadcasting funding transaction with txid {}", tx.txid());
1492 $self.tx_broadcaster.broadcast_transaction(&tx);
1497 if chanmon_update_is_none {
1498 // If there was no ChannelMonitorUpdate, we should never generate an Err in the res loop
1499 // above. Doing so would imply calling handle_err!() from channel_monitor_updated() which
1500 // should *never* end up calling back to `chain_monitor.update_channel()`.
1501 assert!(res.is_ok());
1504 (htlc_forwards, res, counterparty_node_id)
1508 macro_rules! post_handle_chan_restoration {
1509 ($self: ident, $locked_res: expr) => { {
1510 let (htlc_forwards, res, counterparty_node_id) = $locked_res;
1512 let _ = handle_error!($self, res, counterparty_node_id);
1514 if let Some(forwards) = htlc_forwards {
1515 $self.forward_htlcs(&mut [forwards][..]);
1520 impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<Signer, M, T, K, F, L>
1521 where M::Target: chain::Watch<Signer>,
1522 T::Target: BroadcasterInterface,
1523 K::Target: KeysInterface<Signer = Signer>,
1524 F::Target: FeeEstimator,
1527 /// Constructs a new ChannelManager to hold several channels and route between them.
1529 /// This is the main "logic hub" for all channel-related actions, and implements
1530 /// ChannelMessageHandler.
1532 /// Non-proportional fees are fixed according to our risk using the provided fee estimator.
1534 /// Users need to notify the new ChannelManager when a new block is connected or
1535 /// disconnected using its `block_connected` and `block_disconnected` methods, starting
1536 /// from after `params.latest_hash`.
1537 pub fn new(fee_est: F, chain_monitor: M, tx_broadcaster: T, logger: L, keys_manager: K, config: UserConfig, params: ChainParameters) -> Self {
1538 let mut secp_ctx = Secp256k1::new();
1539 secp_ctx.seeded_randomize(&keys_manager.get_secure_random_bytes());
1540 let inbound_pmt_key_material = keys_manager.get_inbound_payment_key_material();
1541 let expanded_inbound_key = inbound_payment::ExpandedKey::new(&inbound_pmt_key_material);
1543 default_configuration: config.clone(),
1544 genesis_hash: genesis_block(params.network).header.block_hash(),
1545 fee_estimator: fee_est,
1549 best_block: RwLock::new(params.best_block),
1551 channel_state: Mutex::new(ChannelHolder{
1552 by_id: HashMap::new(),
1553 short_to_id: HashMap::new(),
1554 forward_htlcs: HashMap::new(),
1555 claimable_htlcs: HashMap::new(),
1556 pending_msg_events: Vec::new(),
1558 outbound_scid_aliases: Mutex::new(HashSet::new()),
1559 pending_inbound_payments: Mutex::new(HashMap::new()),
1560 pending_outbound_payments: Mutex::new(HashMap::new()),
1562 our_network_key: keys_manager.get_node_secret(Recipient::Node).unwrap(),
1563 our_network_pubkey: PublicKey::from_secret_key(&secp_ctx, &keys_manager.get_node_secret(Recipient::Node).unwrap()),
1566 inbound_payment_key: expanded_inbound_key,
1567 fake_scid_rand_bytes: keys_manager.get_secure_random_bytes(),
1569 last_node_announcement_serial: AtomicUsize::new(0),
1570 highest_seen_timestamp: AtomicUsize::new(0),
1572 per_peer_state: RwLock::new(HashMap::new()),
1574 pending_events: Mutex::new(Vec::new()),
1575 pending_background_events: Mutex::new(Vec::new()),
1576 total_consistency_lock: RwLock::new(()),
1577 persistence_notifier: PersistenceNotifier::new(),
1585 /// Gets the current configuration applied to all new channels, as
1586 pub fn get_current_default_configuration(&self) -> &UserConfig {
1587 &self.default_configuration
1590 fn create_and_insert_outbound_scid_alias(&self) -> u64 {
1591 let height = self.best_block.read().unwrap().height();
1592 let mut outbound_scid_alias = 0;
1595 if cfg!(fuzzing) { // fuzzing chacha20 doesn't use the key at all so we always get the same alias
1596 outbound_scid_alias += 1;
1598 outbound_scid_alias = fake_scid::Namespace::OutboundAlias.get_fake_scid(height, &self.genesis_hash, &self.fake_scid_rand_bytes, &self.keys_manager);
1600 if outbound_scid_alias != 0 && self.outbound_scid_aliases.lock().unwrap().insert(outbound_scid_alias) {
1604 if i > 1_000_000 { panic!("Your RNG is busted or we ran out of possible outbound SCID aliases (which should never happen before we run out of memory to store channels"); }
1609 /// Creates a new outbound channel to the given remote node and with the given value.
1611 /// `user_channel_id` will be provided back as in
1612 /// [`Event::FundingGenerationReady::user_channel_id`] to allow tracking of which events
1613 /// correspond with which `create_channel` call. Note that the `user_channel_id` defaults to 0
1614 /// for inbound channels, so you may wish to avoid using 0 for `user_channel_id` here.
1615 /// `user_channel_id` has no meaning inside of LDK, it is simply copied to events and otherwise
1618 /// Raises [`APIError::APIMisuseError`] when `channel_value_satoshis` > 2**24 or `push_msat` is
1619 /// greater than `channel_value_satoshis * 1k` or `channel_value_satoshis < 1000`.
1621 /// Note that we do not check if you are currently connected to the given peer. If no
1622 /// connection is available, the outbound `open_channel` message may fail to send, resulting in
1623 /// the channel eventually being silently forgotten (dropped on reload).
1625 /// Returns the new Channel's temporary `channel_id`. This ID will appear as
1626 /// [`Event::FundingGenerationReady::temporary_channel_id`] and in
1627 /// [`ChannelDetails::channel_id`] until after
1628 /// [`ChannelManager::funding_transaction_generated`] is called, swapping the Channel's ID for
1629 /// one derived from the funding transaction's TXID. If the counterparty rejects the channel
1630 /// immediately, this temporary ID will appear in [`Event::ChannelClosed::channel_id`].
1632 /// [`Event::FundingGenerationReady::user_channel_id`]: events::Event::FundingGenerationReady::user_channel_id
1633 /// [`Event::FundingGenerationReady::temporary_channel_id`]: events::Event::FundingGenerationReady::temporary_channel_id
1634 /// [`Event::ChannelClosed::channel_id`]: events::Event::ChannelClosed::channel_id
1635 pub fn create_channel(&self, their_network_key: PublicKey, channel_value_satoshis: u64, push_msat: u64, user_channel_id: u64, override_config: Option<UserConfig>) -> Result<[u8; 32], APIError> {
1636 if channel_value_satoshis < 1000 {
1637 return Err(APIError::APIMisuseError { err: format!("Channel value must be at least 1000 satoshis. It was {}", channel_value_satoshis) });
1641 let per_peer_state = self.per_peer_state.read().unwrap();
1642 match per_peer_state.get(&their_network_key) {
1643 Some(peer_state) => {
1644 let outbound_scid_alias = self.create_and_insert_outbound_scid_alias();
1645 let peer_state = peer_state.lock().unwrap();
1646 let their_features = &peer_state.latest_features;
1647 let config = if override_config.is_some() { override_config.as_ref().unwrap() } else { &self.default_configuration };
1648 match Channel::new_outbound(&self.fee_estimator, &self.keys_manager, their_network_key,
1649 their_features, channel_value_satoshis, push_msat, user_channel_id, config,
1650 self.best_block.read().unwrap().height(), outbound_scid_alias)
1654 self.outbound_scid_aliases.lock().unwrap().remove(&outbound_scid_alias);
1659 None => return Err(APIError::ChannelUnavailable { err: format!("Not connected to node: {}", their_network_key) }),
1662 let res = channel.get_open_channel(self.genesis_hash.clone());
1664 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
1665 // We want to make sure the lock is actually acquired by PersistenceNotifierGuard.
1666 debug_assert!(&self.total_consistency_lock.try_write().is_err());
1668 let temporary_channel_id = channel.channel_id();
1669 let mut channel_state = self.channel_state.lock().unwrap();
1670 match channel_state.by_id.entry(temporary_channel_id) {
1671 hash_map::Entry::Occupied(_) => {
1673 return Err(APIError::APIMisuseError { err: "Fuzzy bad RNG".to_owned() });
1675 panic!("RNG is bad???");
1678 hash_map::Entry::Vacant(entry) => { entry.insert(channel); }
1680 channel_state.pending_msg_events.push(events::MessageSendEvent::SendOpenChannel {
1681 node_id: their_network_key,
1684 Ok(temporary_channel_id)
1687 fn list_channels_with_filter<Fn: FnMut(&(&[u8; 32], &Channel<Signer>)) -> bool>(&self, f: Fn) -> Vec<ChannelDetails> {
1688 let mut res = Vec::new();
1690 let channel_state = self.channel_state.lock().unwrap();
1691 res.reserve(channel_state.by_id.len());
1692 for (channel_id, channel) in channel_state.by_id.iter().filter(f) {
1693 let balance = channel.get_available_balances();
1694 let (to_remote_reserve_satoshis, to_self_reserve_satoshis) =
1695 channel.get_holder_counterparty_selected_channel_reserve_satoshis();
1696 res.push(ChannelDetails {
1697 channel_id: (*channel_id).clone(),
1698 counterparty: ChannelCounterparty {
1699 node_id: channel.get_counterparty_node_id(),
1700 features: InitFeatures::empty(),
1701 unspendable_punishment_reserve: to_remote_reserve_satoshis,
1702 forwarding_info: channel.counterparty_forwarding_info(),
1703 // Ensures that we have actually received the `htlc_minimum_msat` value
1704 // from the counterparty through the `OpenChannel` or `AcceptChannel`
1705 // message (as they are always the first message from the counterparty).
1706 // Else `Channel::get_counterparty_htlc_minimum_msat` could return the
1707 // default `0` value set by `Channel::new_outbound`.
1708 outbound_htlc_minimum_msat: if channel.have_received_message() {
1709 Some(channel.get_counterparty_htlc_minimum_msat()) } else { None },
1710 outbound_htlc_maximum_msat: channel.get_counterparty_htlc_maximum_msat(),
1712 funding_txo: channel.get_funding_txo(),
1713 // Note that accept_channel (or open_channel) is always the first message, so
1714 // `have_received_message` indicates that type negotiation has completed.
1715 channel_type: if channel.have_received_message() { Some(channel.get_channel_type().clone()) } else { None },
1716 short_channel_id: channel.get_short_channel_id(),
1717 inbound_scid_alias: channel.latest_inbound_scid_alias(),
1718 channel_value_satoshis: channel.get_value_satoshis(),
1719 unspendable_punishment_reserve: to_self_reserve_satoshis,
1720 balance_msat: balance.balance_msat,
1721 inbound_capacity_msat: balance.inbound_capacity_msat,
1722 outbound_capacity_msat: balance.outbound_capacity_msat,
1723 next_outbound_htlc_limit_msat: balance.next_outbound_htlc_limit_msat,
1724 user_channel_id: channel.get_user_id(),
1725 confirmations_required: channel.minimum_depth(),
1726 force_close_spend_delay: channel.get_counterparty_selected_contest_delay(),
1727 is_outbound: channel.is_outbound(),
1728 is_funding_locked: channel.is_usable(),
1729 is_usable: channel.is_live(),
1730 is_public: channel.should_announce(),
1731 inbound_htlc_minimum_msat: Some(channel.get_holder_htlc_minimum_msat()),
1732 inbound_htlc_maximum_msat: channel.get_holder_htlc_maximum_msat()
1736 let per_peer_state = self.per_peer_state.read().unwrap();
1737 for chan in res.iter_mut() {
1738 if let Some(peer_state) = per_peer_state.get(&chan.counterparty.node_id) {
1739 chan.counterparty.features = peer_state.lock().unwrap().latest_features.clone();
1745 /// Gets the list of open channels, in random order. See ChannelDetail field documentation for
1746 /// more information.
1747 pub fn list_channels(&self) -> Vec<ChannelDetails> {
1748 self.list_channels_with_filter(|_| true)
1751 /// Gets the list of usable channels, in random order. Useful as an argument to
1752 /// get_route to ensure non-announced channels are used.
1754 /// These are guaranteed to have their [`ChannelDetails::is_usable`] value set to true, see the
1755 /// documentation for [`ChannelDetails::is_usable`] for more info on exactly what the criteria
1757 pub fn list_usable_channels(&self) -> Vec<ChannelDetails> {
1758 // Note we use is_live here instead of usable which leads to somewhat confused
1759 // internal/external nomenclature, but that's ok cause that's probably what the user
1760 // really wanted anyway.
1761 self.list_channels_with_filter(|&(_, ref channel)| channel.is_live())
1764 /// Helper function that issues the channel close events
1765 fn issue_channel_close_events(&self, channel: &Channel<Signer>, closure_reason: ClosureReason) {
1766 let mut pending_events_lock = self.pending_events.lock().unwrap();
1767 match channel.unbroadcasted_funding() {
1768 Some(transaction) => {
1769 pending_events_lock.push(events::Event::DiscardFunding { channel_id: channel.channel_id(), transaction })
1773 pending_events_lock.push(events::Event::ChannelClosed {
1774 channel_id: channel.channel_id(),
1775 user_channel_id: channel.get_user_id(),
1776 reason: closure_reason
1780 fn close_channel_internal(&self, channel_id: &[u8; 32], counterparty_node_id: &PublicKey, target_feerate_sats_per_1000_weight: Option<u32>) -> Result<(), APIError> {
1781 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
1783 let mut failed_htlcs: Vec<(HTLCSource, PaymentHash)>;
1784 let result: Result<(), _> = loop {
1785 let mut channel_state_lock = self.channel_state.lock().unwrap();
1786 let channel_state = &mut *channel_state_lock;
1787 match channel_state.by_id.entry(channel_id.clone()) {
1788 hash_map::Entry::Occupied(mut chan_entry) => {
1789 if *counterparty_node_id != chan_entry.get().get_counterparty_node_id(){
1790 return Err(APIError::APIMisuseError { err: "The passed counterparty_node_id doesn't match the channel's counterparty node_id".to_owned() });
1792 let per_peer_state = self.per_peer_state.read().unwrap();
1793 let (shutdown_msg, monitor_update, htlcs) = match per_peer_state.get(&counterparty_node_id) {
1794 Some(peer_state) => {
1795 let peer_state = peer_state.lock().unwrap();
1796 let their_features = &peer_state.latest_features;
1797 chan_entry.get_mut().get_shutdown(&self.keys_manager, their_features, target_feerate_sats_per_1000_weight)?
1799 None => return Err(APIError::ChannelUnavailable { err: format!("Not connected to node: {}", counterparty_node_id) }),
1801 failed_htlcs = htlcs;
1803 // Update the monitor with the shutdown script if necessary.
1804 if let Some(monitor_update) = monitor_update {
1805 if let Err(e) = self.chain_monitor.update_channel(chan_entry.get().get_funding_txo().unwrap(), monitor_update) {
1806 let (result, is_permanent) =
1807 handle_monitor_err!(self, e, channel_state.short_to_id, chan_entry.get_mut(), RAACommitmentOrder::CommitmentFirst, chan_entry.key(), NO_UPDATE);
1809 remove_channel!(self, channel_state, chan_entry);
1815 channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
1816 node_id: *counterparty_node_id,
1820 if chan_entry.get().is_shutdown() {
1821 let channel = remove_channel!(self, channel_state, chan_entry);
1822 if let Ok(channel_update) = self.get_channel_update_for_broadcast(&channel) {
1823 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
1827 self.issue_channel_close_events(&channel, ClosureReason::HolderForceClosed);
1831 hash_map::Entry::Vacant(_) => return Err(APIError::ChannelUnavailable{err: "No such channel".to_owned()})
1835 for htlc_source in failed_htlcs.drain(..) {
1836 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() });
1839 let _ = handle_error!(self, result, *counterparty_node_id);
1843 /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
1844 /// will be accepted on the given channel, and after additional timeout/the closing of all
1845 /// pending HTLCs, the channel will be closed on chain.
1847 /// * If we are the channel initiator, we will pay between our [`Background`] and
1848 /// [`ChannelConfig::force_close_avoidance_max_fee_satoshis`] plus our [`Normal`] fee
1850 /// * If our counterparty is the channel initiator, we will require a channel closing
1851 /// transaction feerate of at least our [`Background`] feerate or the feerate which
1852 /// would appear on a force-closure transaction, whichever is lower. We will allow our
1853 /// counterparty to pay as much fee as they'd like, however.
1855 /// May generate a SendShutdown message event on success, which should be relayed.
1857 /// [`ChannelConfig::force_close_avoidance_max_fee_satoshis`]: crate::util::config::ChannelConfig::force_close_avoidance_max_fee_satoshis
1858 /// [`Background`]: crate::chain::chaininterface::ConfirmationTarget::Background
1859 /// [`Normal`]: crate::chain::chaininterface::ConfirmationTarget::Normal
1860 pub fn close_channel(&self, channel_id: &[u8; 32], counterparty_node_id: &PublicKey) -> Result<(), APIError> {
1861 self.close_channel_internal(channel_id, counterparty_node_id, None)
1864 /// Begins the process of closing a channel. After this call (plus some timeout), no new HTLCs
1865 /// will be accepted on the given channel, and after additional timeout/the closing of all
1866 /// pending HTLCs, the channel will be closed on chain.
1868 /// `target_feerate_sat_per_1000_weight` has different meanings depending on if we initiated
1869 /// the channel being closed or not:
1870 /// * If we are the channel initiator, we will pay at least this feerate on the closing
1871 /// transaction. The upper-bound is set by
1872 /// [`ChannelConfig::force_close_avoidance_max_fee_satoshis`] plus our [`Normal`] fee
1873 /// estimate (or `target_feerate_sat_per_1000_weight`, if it is greater).
1874 /// * If our counterparty is the channel initiator, we will refuse to accept a channel closure
1875 /// transaction feerate below `target_feerate_sat_per_1000_weight` (or the feerate which
1876 /// will appear on a force-closure transaction, whichever is lower).
1878 /// May generate a SendShutdown message event on success, which should be relayed.
1880 /// [`ChannelConfig::force_close_avoidance_max_fee_satoshis`]: crate::util::config::ChannelConfig::force_close_avoidance_max_fee_satoshis
1881 /// [`Background`]: crate::chain::chaininterface::ConfirmationTarget::Background
1882 /// [`Normal`]: crate::chain::chaininterface::ConfirmationTarget::Normal
1883 pub fn close_channel_with_target_feerate(&self, channel_id: &[u8; 32], counterparty_node_id: &PublicKey, target_feerate_sats_per_1000_weight: u32) -> Result<(), APIError> {
1884 self.close_channel_internal(channel_id, counterparty_node_id, Some(target_feerate_sats_per_1000_weight))
1888 fn finish_force_close_channel(&self, shutdown_res: ShutdownResult) {
1889 let (monitor_update_option, mut failed_htlcs) = shutdown_res;
1890 log_debug!(self.logger, "Finishing force-closure of channel with {} HTLCs to fail", failed_htlcs.len());
1891 for htlc_source in failed_htlcs.drain(..) {
1892 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() });
1894 if let Some((funding_txo, monitor_update)) = monitor_update_option {
1895 // There isn't anything we can do if we get an update failure - we're already
1896 // force-closing. The monitor update on the required in-memory copy should broadcast
1897 // the latest local state, which is the best we can do anyway. Thus, it is safe to
1898 // ignore the result here.
1899 let _ = self.chain_monitor.update_channel(funding_txo, monitor_update);
1903 /// `peer_msg` should be set when we receive a message from a peer, but not set when the
1904 /// user closes, which will be re-exposed as the `ChannelClosed` reason.
1905 fn force_close_channel_with_peer(&self, channel_id: &[u8; 32], peer_node_id: &PublicKey, peer_msg: Option<&String>) -> Result<PublicKey, APIError> {
1907 let mut channel_state_lock = self.channel_state.lock().unwrap();
1908 let channel_state = &mut *channel_state_lock;
1909 if let hash_map::Entry::Occupied(chan) = channel_state.by_id.entry(channel_id.clone()) {
1910 if chan.get().get_counterparty_node_id() != *peer_node_id {
1911 return Err(APIError::ChannelUnavailable{err: "No such channel".to_owned()});
1913 if let Some(peer_msg) = peer_msg {
1914 self.issue_channel_close_events(chan.get(),ClosureReason::CounterpartyForceClosed { peer_msg: peer_msg.to_string() });
1916 self.issue_channel_close_events(chan.get(),ClosureReason::HolderForceClosed);
1918 remove_channel!(self, channel_state, chan)
1920 return Err(APIError::ChannelUnavailable{err: "No such channel".to_owned()});
1923 log_error!(self.logger, "Force-closing channel {}", log_bytes!(channel_id[..]));
1924 self.finish_force_close_channel(chan.force_shutdown(true));
1925 if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
1926 let mut channel_state = self.channel_state.lock().unwrap();
1927 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
1932 Ok(chan.get_counterparty_node_id())
1935 /// Force closes a channel, immediately broadcasting the latest local commitment transaction to
1936 /// the chain and rejecting new HTLCs on the given channel. Fails if `channel_id` is unknown to
1937 /// the manager, or if the `counterparty_node_id` isn't the counterparty of the corresponding
1939 pub fn force_close_channel(&self, channel_id: &[u8; 32], counterparty_node_id: &PublicKey) -> Result<(), APIError> {
1940 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
1941 match self.force_close_channel_with_peer(channel_id, counterparty_node_id, None) {
1942 Ok(counterparty_node_id) => {
1943 self.channel_state.lock().unwrap().pending_msg_events.push(
1944 events::MessageSendEvent::HandleError {
1945 node_id: counterparty_node_id,
1946 action: msgs::ErrorAction::SendErrorMessage {
1947 msg: msgs::ErrorMessage { channel_id: *channel_id, data: "Channel force-closed".to_owned() }
1957 /// Force close all channels, immediately broadcasting the latest local commitment transaction
1958 /// for each to the chain and rejecting new HTLCs on each.
1959 pub fn force_close_all_channels(&self) {
1960 for chan in self.list_channels() {
1961 let _ = self.force_close_channel(&chan.channel_id, &chan.counterparty.node_id);
1965 fn construct_recv_pending_htlc_info(&self, hop_data: msgs::OnionHopData, shared_secret: [u8; 32],
1966 payment_hash: PaymentHash, amt_msat: u64, cltv_expiry: u32, phantom_shared_secret: Option<[u8; 32]>) -> Result<PendingHTLCInfo, ReceiveError>
1968 // final_incorrect_cltv_expiry
1969 if hop_data.outgoing_cltv_value != cltv_expiry {
1970 return Err(ReceiveError {
1971 msg: "Upstream node set CLTV to the wrong value",
1973 err_data: byte_utils::be32_to_array(cltv_expiry).to_vec()
1976 // final_expiry_too_soon
1977 // We have to have some headroom to broadcast on chain if we have the preimage, so make sure
1978 // we have at least HTLC_FAIL_BACK_BUFFER blocks to go.
1979 // Also, ensure that, in the case of an unknown preimage for the received payment hash, our
1980 // payment logic has enough time to fail the HTLC backward before our onchain logic triggers a
1981 // channel closure (see HTLC_FAIL_BACK_BUFFER rationale).
1982 if (hop_data.outgoing_cltv_value as u64) <= self.best_block.read().unwrap().height() as u64 + HTLC_FAIL_BACK_BUFFER as u64 + 1 {
1983 return Err(ReceiveError {
1985 err_data: Vec::new(),
1986 msg: "The final CLTV expiry is too soon to handle",
1989 if hop_data.amt_to_forward > amt_msat {
1990 return Err(ReceiveError {
1992 err_data: byte_utils::be64_to_array(amt_msat).to_vec(),
1993 msg: "Upstream node sent less than we were supposed to receive in payment",
1997 let routing = match hop_data.format {
1998 msgs::OnionHopDataFormat::Legacy { .. } => {
1999 return Err(ReceiveError {
2000 err_code: 0x4000|0x2000|3,
2001 err_data: Vec::new(),
2002 msg: "We require payment_secrets",
2005 msgs::OnionHopDataFormat::NonFinalNode { .. } => {
2006 return Err(ReceiveError {
2007 err_code: 0x4000|22,
2008 err_data: Vec::new(),
2009 msg: "Got non final data with an HMAC of 0",
2012 msgs::OnionHopDataFormat::FinalNode { payment_data, keysend_preimage } => {
2013 if payment_data.is_some() && keysend_preimage.is_some() {
2014 return Err(ReceiveError {
2015 err_code: 0x4000|22,
2016 err_data: Vec::new(),
2017 msg: "We don't support MPP keysend payments",
2019 } else if let Some(data) = payment_data {
2020 PendingHTLCRouting::Receive {
2022 incoming_cltv_expiry: hop_data.outgoing_cltv_value,
2023 phantom_shared_secret,
2025 } else if let Some(payment_preimage) = keysend_preimage {
2026 // We need to check that the sender knows the keysend preimage before processing this
2027 // payment further. Otherwise, an intermediary routing hop forwarding non-keysend-HTLC X
2028 // could discover the final destination of X, by probing the adjacent nodes on the route
2029 // with a keysend payment of identical payment hash to X and observing the processing
2030 // time discrepancies due to a hash collision with X.
2031 let hashed_preimage = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
2032 if hashed_preimage != payment_hash {
2033 return Err(ReceiveError {
2034 err_code: 0x4000|22,
2035 err_data: Vec::new(),
2036 msg: "Payment preimage didn't match payment hash",
2040 PendingHTLCRouting::ReceiveKeysend {
2042 incoming_cltv_expiry: hop_data.outgoing_cltv_value,
2045 return Err(ReceiveError {
2046 err_code: 0x4000|0x2000|3,
2047 err_data: Vec::new(),
2048 msg: "We require payment_secrets",
2053 Ok(PendingHTLCInfo {
2056 incoming_shared_secret: shared_secret,
2057 amt_to_forward: amt_msat,
2058 outgoing_cltv_value: hop_data.outgoing_cltv_value,
2062 fn decode_update_add_htlc_onion(&self, msg: &msgs::UpdateAddHTLC) -> (PendingHTLCStatus, MutexGuard<ChannelHolder<Signer>>) {
2063 macro_rules! return_malformed_err {
2064 ($msg: expr, $err_code: expr) => {
2066 log_info!(self.logger, "Failed to accept/forward incoming HTLC: {}", $msg);
2067 return (PendingHTLCStatus::Fail(HTLCFailureMsg::Malformed(msgs::UpdateFailMalformedHTLC {
2068 channel_id: msg.channel_id,
2069 htlc_id: msg.htlc_id,
2070 sha256_of_onion: Sha256::hash(&msg.onion_routing_packet.hop_data).into_inner(),
2071 failure_code: $err_code,
2072 })), self.channel_state.lock().unwrap());
2077 if let Err(_) = msg.onion_routing_packet.public_key {
2078 return_malformed_err!("invalid ephemeral pubkey", 0x8000 | 0x4000 | 6);
2081 let shared_secret = SharedSecret::new(&msg.onion_routing_packet.public_key.unwrap(), &self.our_network_key).secret_bytes();
2083 if msg.onion_routing_packet.version != 0 {
2084 //TODO: Spec doesn't indicate if we should only hash hop_data here (and in other
2085 //sha256_of_onion error data packets), or the entire onion_routing_packet. Either way,
2086 //the hash doesn't really serve any purpose - in the case of hashing all data, the
2087 //receiving node would have to brute force to figure out which version was put in the
2088 //packet by the node that send us the message, in the case of hashing the hop_data, the
2089 //node knows the HMAC matched, so they already know what is there...
2090 return_malformed_err!("Unknown onion packet version", 0x8000 | 0x4000 | 4);
2093 let mut channel_state = None;
2094 macro_rules! return_err {
2095 ($msg: expr, $err_code: expr, $data: expr) => {
2097 log_info!(self.logger, "Failed to accept/forward incoming HTLC: {}", $msg);
2098 if channel_state.is_none() {
2099 channel_state = Some(self.channel_state.lock().unwrap());
2101 return (PendingHTLCStatus::Fail(HTLCFailureMsg::Relay(msgs::UpdateFailHTLC {
2102 channel_id: msg.channel_id,
2103 htlc_id: msg.htlc_id,
2104 reason: onion_utils::build_first_hop_failure_packet(&shared_secret, $err_code, $data),
2105 })), channel_state.unwrap());
2110 let next_hop = match onion_utils::decode_next_hop(shared_secret, &msg.onion_routing_packet.hop_data[..], msg.onion_routing_packet.hmac, msg.payment_hash) {
2112 Err(onion_utils::OnionDecodeErr::Malformed { err_msg, err_code }) => {
2113 return_malformed_err!(err_msg, err_code);
2115 Err(onion_utils::OnionDecodeErr::Relay { err_msg, err_code }) => {
2116 return_err!(err_msg, err_code, &[0; 0]);
2120 let pending_forward_info = match next_hop {
2121 onion_utils::Hop::Receive(next_hop_data) => {
2123 match self.construct_recv_pending_htlc_info(next_hop_data, shared_secret, msg.payment_hash, msg.amount_msat, msg.cltv_expiry, None) {
2125 // Note that we could obviously respond immediately with an update_fulfill_htlc
2126 // message, however that would leak that we are the recipient of this payment, so
2127 // instead we stay symmetric with the forwarding case, only responding (after a
2128 // delay) once they've send us a commitment_signed!
2129 PendingHTLCStatus::Forward(info)
2131 Err(ReceiveError { err_code, err_data, msg }) => return_err!(msg, err_code, &err_data)
2134 onion_utils::Hop::Forward { next_hop_data, next_hop_hmac, new_packet_bytes } => {
2135 let mut new_pubkey = msg.onion_routing_packet.public_key.unwrap();
2137 let blinding_factor = {
2138 let mut sha = Sha256::engine();
2139 sha.input(&new_pubkey.serialize()[..]);
2140 sha.input(&shared_secret);
2141 Sha256::from_engine(sha).into_inner()
2144 let public_key = if let Err(e) = new_pubkey.mul_assign(&self.secp_ctx, &blinding_factor[..]) {
2146 } else { Ok(new_pubkey) };
2148 let outgoing_packet = msgs::OnionPacket {
2151 hop_data: new_packet_bytes,
2152 hmac: next_hop_hmac.clone(),
2155 let short_channel_id = match next_hop_data.format {
2156 msgs::OnionHopDataFormat::Legacy { short_channel_id } => short_channel_id,
2157 msgs::OnionHopDataFormat::NonFinalNode { short_channel_id } => short_channel_id,
2158 msgs::OnionHopDataFormat::FinalNode { .. } => {
2159 return_err!("Final Node OnionHopData provided for us as an intermediary node", 0x4000 | 22, &[0;0]);
2163 PendingHTLCStatus::Forward(PendingHTLCInfo {
2164 routing: PendingHTLCRouting::Forward {
2165 onion_packet: outgoing_packet,
2168 payment_hash: msg.payment_hash.clone(),
2169 incoming_shared_secret: shared_secret,
2170 amt_to_forward: next_hop_data.amt_to_forward,
2171 outgoing_cltv_value: next_hop_data.outgoing_cltv_value,
2176 channel_state = Some(self.channel_state.lock().unwrap());
2177 if let &PendingHTLCStatus::Forward(PendingHTLCInfo { ref routing, ref amt_to_forward, ref outgoing_cltv_value, .. }) = &pending_forward_info {
2178 // If short_channel_id is 0 here, we'll reject the HTLC as there cannot be a channel
2179 // with a short_channel_id of 0. This is important as various things later assume
2180 // short_channel_id is non-0 in any ::Forward.
2181 if let &PendingHTLCRouting::Forward { ref short_channel_id, .. } = routing {
2182 let id_option = channel_state.as_ref().unwrap().short_to_id.get(&short_channel_id).cloned();
2183 if let Some((err, code, chan_update)) = loop {
2184 let forwarding_id_opt = match id_option {
2185 None => { // unknown_next_peer
2186 // Note that this is likely a timing oracle for detecting whether an scid is a
2188 if fake_scid::is_valid_phantom(&self.fake_scid_rand_bytes, *short_channel_id) {
2191 break Some(("Don't have available channel for forwarding as requested.", 0x4000 | 10, None));
2194 Some(id) => Some(id.clone()),
2196 let (chan_update_opt, forwardee_cltv_expiry_delta) = if let Some(forwarding_id) = forwarding_id_opt {
2197 let chan = channel_state.as_mut().unwrap().by_id.get_mut(&forwarding_id).unwrap();
2198 if !chan.should_announce() && !self.default_configuration.accept_forwards_to_priv_channels {
2199 // Note that the behavior here should be identical to the above block - we
2200 // should NOT reveal the existence or non-existence of a private channel if
2201 // we don't allow forwards outbound over them.
2202 break Some(("Refusing to forward to a private channel based on our config.", 0x4000 | 10, None));
2204 if chan.get_channel_type().supports_scid_privacy() && *short_channel_id != chan.outbound_scid_alias() {
2205 // `option_scid_alias` (referred to in LDK as `scid_privacy`) means
2206 // "refuse to forward unless the SCID alias was used", so we pretend
2207 // we don't have the channel here.
2208 break Some(("Refusing to forward over real channel SCID as our counterparty requested.", 0x4000 | 10, None));
2210 let chan_update_opt = self.get_channel_update_for_onion(*short_channel_id, chan).ok();
2212 // Note that we could technically not return an error yet here and just hope
2213 // that the connection is reestablished or monitor updated by the time we get
2214 // around to doing the actual forward, but better to fail early if we can and
2215 // hopefully an attacker trying to path-trace payments cannot make this occur
2216 // on a small/per-node/per-channel scale.
2217 if !chan.is_live() { // channel_disabled
2218 break Some(("Forwarding channel is not in a ready state.", 0x1000 | 20, chan_update_opt));
2220 if *amt_to_forward < chan.get_counterparty_htlc_minimum_msat() { // amount_below_minimum
2221 break Some(("HTLC amount was below the htlc_minimum_msat", 0x1000 | 11, chan_update_opt));
2223 let fee = amt_to_forward.checked_mul(chan.get_fee_proportional_millionths() as u64)
2224 .and_then(|prop_fee| { (prop_fee / 1000000)
2225 .checked_add(chan.get_outbound_forwarding_fee_base_msat() as u64) });
2226 if fee.is_none() || msg.amount_msat < fee.unwrap() || (msg.amount_msat - fee.unwrap()) < *amt_to_forward { // fee_insufficient
2227 break Some(("Prior hop has deviated from specified fees parameters or origin node has obsolete ones", 0x1000 | 12, chan_update_opt));
2229 (chan_update_opt, chan.get_cltv_expiry_delta())
2230 } else { (None, MIN_CLTV_EXPIRY_DELTA) };
2232 if (msg.cltv_expiry as u64) < (*outgoing_cltv_value) as u64 + forwardee_cltv_expiry_delta as u64 { // incorrect_cltv_expiry
2233 break Some(("Forwarding node has tampered with the intended HTLC values or origin node has an obsolete cltv_expiry_delta", 0x1000 | 13, chan_update_opt));
2235 let cur_height = self.best_block.read().unwrap().height() + 1;
2236 // Theoretically, channel counterparty shouldn't send us a HTLC expiring now,
2237 // but we want to be robust wrt to counterparty packet sanitization (see
2238 // HTLC_FAIL_BACK_BUFFER rationale).
2239 if msg.cltv_expiry <= cur_height + HTLC_FAIL_BACK_BUFFER as u32 { // expiry_too_soon
2240 break Some(("CLTV expiry is too close", 0x1000 | 14, chan_update_opt));
2242 if msg.cltv_expiry > cur_height + CLTV_FAR_FAR_AWAY as u32 { // expiry_too_far
2243 break Some(("CLTV expiry is too far in the future", 21, None));
2245 // If the HTLC expires ~now, don't bother trying to forward it to our
2246 // counterparty. They should fail it anyway, but we don't want to bother with
2247 // the round-trips or risk them deciding they definitely want the HTLC and
2248 // force-closing to ensure they get it if we're offline.
2249 // We previously had a much more aggressive check here which tried to ensure
2250 // our counterparty receives an HTLC which has *our* risk threshold met on it,
2251 // but there is no need to do that, and since we're a bit conservative with our
2252 // risk threshold it just results in failing to forward payments.
2253 if (*outgoing_cltv_value) as u64 <= (cur_height + LATENCY_GRACE_PERIOD_BLOCKS) as u64 {
2254 break Some(("Outgoing CLTV value is too soon", 0x1000 | 14, chan_update_opt));
2260 let mut res = VecWriter(Vec::with_capacity(chan_update.serialized_length() + 2 + 8 + 2));
2261 if let Some(chan_update) = chan_update {
2262 if code == 0x1000 | 11 || code == 0x1000 | 12 {
2263 msg.amount_msat.write(&mut res).expect("Writes cannot fail");
2265 else if code == 0x1000 | 13 {
2266 msg.cltv_expiry.write(&mut res).expect("Writes cannot fail");
2268 else if code == 0x1000 | 20 {
2269 // TODO: underspecified, follow https://github.com/lightningnetwork/lightning-rfc/issues/791
2270 0u16.write(&mut res).expect("Writes cannot fail");
2272 (chan_update.serialized_length() as u16 + 2).write(&mut res).expect("Writes cannot fail");
2273 msgs::ChannelUpdate::TYPE.write(&mut res).expect("Writes cannot fail");
2274 chan_update.write(&mut res).expect("Writes cannot fail");
2276 return_err!(err, code, &res.0[..]);
2281 (pending_forward_info, channel_state.unwrap())
2284 /// Gets the current channel_update for the given channel. This first checks if the channel is
2285 /// public, and thus should be called whenever the result is going to be passed out in a
2286 /// [`MessageSendEvent::BroadcastChannelUpdate`] event.
2288 /// May be called with channel_state already locked!
2289 fn get_channel_update_for_broadcast(&self, chan: &Channel<Signer>) -> Result<msgs::ChannelUpdate, LightningError> {
2290 if !chan.should_announce() {
2291 return Err(LightningError {
2292 err: "Cannot broadcast a channel_update for a private channel".to_owned(),
2293 action: msgs::ErrorAction::IgnoreError
2296 if chan.get_short_channel_id().is_none() {
2297 return Err(LightningError{err: "Channel not yet established".to_owned(), action: msgs::ErrorAction::IgnoreError});
2299 log_trace!(self.logger, "Attempting to generate broadcast channel update for channel {}", log_bytes!(chan.channel_id()));
2300 self.get_channel_update_for_unicast(chan)
2303 /// Gets the current channel_update for the given channel. This does not check if the channel
2304 /// is public (only returning an Err if the channel does not yet have an assigned short_id),
2305 /// and thus MUST NOT be called unless the recipient of the resulting message has already
2306 /// provided evidence that they know about the existence of the channel.
2307 /// May be called with channel_state already locked!
2308 fn get_channel_update_for_unicast(&self, chan: &Channel<Signer>) -> Result<msgs::ChannelUpdate, LightningError> {
2309 log_trace!(self.logger, "Attempting to generate channel update for channel {}", log_bytes!(chan.channel_id()));
2310 let short_channel_id = match chan.get_short_channel_id().or(chan.latest_inbound_scid_alias()) {
2311 None => return Err(LightningError{err: "Channel not yet established".to_owned(), action: msgs::ErrorAction::IgnoreError}),
2315 self.get_channel_update_for_onion(short_channel_id, chan)
2317 fn get_channel_update_for_onion(&self, short_channel_id: u64, chan: &Channel<Signer>) -> Result<msgs::ChannelUpdate, LightningError> {
2318 log_trace!(self.logger, "Generating channel update for channel {}", log_bytes!(chan.channel_id()));
2319 let were_node_one = PublicKey::from_secret_key(&self.secp_ctx, &self.our_network_key).serialize()[..] < chan.get_counterparty_node_id().serialize()[..];
2321 let unsigned = msgs::UnsignedChannelUpdate {
2322 chain_hash: self.genesis_hash,
2324 timestamp: chan.get_update_time_counter(),
2325 flags: (!were_node_one) as u8 | ((!chan.is_live() as u8) << 1),
2326 cltv_expiry_delta: chan.get_cltv_expiry_delta(),
2327 htlc_minimum_msat: chan.get_counterparty_htlc_minimum_msat(),
2328 htlc_maximum_msat: OptionalField::Present(chan.get_announced_htlc_max_msat()),
2329 fee_base_msat: chan.get_outbound_forwarding_fee_base_msat(),
2330 fee_proportional_millionths: chan.get_fee_proportional_millionths(),
2331 excess_data: Vec::new(),
2334 let msg_hash = Sha256dHash::hash(&unsigned.encode()[..]);
2335 let sig = self.secp_ctx.sign_ecdsa(&hash_to_message!(&msg_hash[..]), &self.our_network_key);
2337 Ok(msgs::ChannelUpdate {
2343 // Only public for testing, this should otherwise never be called direcly
2344 pub(crate) fn send_payment_along_path(&self, path: &Vec<RouteHop>, payment_params: &Option<PaymentParameters>, payment_hash: &PaymentHash, payment_secret: &Option<PaymentSecret>, total_value: u64, cur_height: u32, payment_id: PaymentId, keysend_preimage: &Option<PaymentPreimage>) -> Result<(), APIError> {
2345 log_trace!(self.logger, "Attempting to send payment for path with next hop {}", path.first().unwrap().short_channel_id);
2346 let prng_seed = self.keys_manager.get_secure_random_bytes();
2347 let session_priv_bytes = self.keys_manager.get_secure_random_bytes();
2348 let session_priv = SecretKey::from_slice(&session_priv_bytes[..]).expect("RNG is busted");
2350 let onion_keys = onion_utils::construct_onion_keys(&self.secp_ctx, &path, &session_priv)
2351 .map_err(|_| APIError::RouteError{err: "Pubkey along hop was maliciously selected"})?;
2352 let (onion_payloads, htlc_msat, htlc_cltv) = onion_utils::build_onion_payloads(path, total_value, payment_secret, cur_height, keysend_preimage)?;
2353 if onion_utils::route_size_insane(&onion_payloads) {
2354 return Err(APIError::RouteError{err: "Route size too large considering onion data"});
2356 let onion_packet = onion_utils::construct_onion_packet(onion_payloads, onion_keys, prng_seed, payment_hash);
2358 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
2360 let err: Result<(), _> = loop {
2361 let mut channel_lock = self.channel_state.lock().unwrap();
2363 let mut pending_outbounds = self.pending_outbound_payments.lock().unwrap();
2364 let payment_entry = pending_outbounds.entry(payment_id);
2365 if let hash_map::Entry::Occupied(payment) = &payment_entry {
2366 if !payment.get().is_retryable() {
2367 return Err(APIError::RouteError {
2368 err: "Payment already completed"
2373 let id = match channel_lock.short_to_id.get(&path.first().unwrap().short_channel_id) {
2374 None => return Err(APIError::ChannelUnavailable{err: "No channel available with first hop!".to_owned()}),
2375 Some(id) => id.clone(),
2378 macro_rules! insert_outbound_payment {
2380 let payment = payment_entry.or_insert_with(|| PendingOutboundPayment::Retryable {
2381 session_privs: HashSet::new(),
2382 pending_amt_msat: 0,
2383 pending_fee_msat: Some(0),
2384 payment_hash: *payment_hash,
2385 payment_secret: *payment_secret,
2386 starting_block_height: self.best_block.read().unwrap().height(),
2387 total_msat: total_value,
2389 assert!(payment.insert(session_priv_bytes, path));
2393 let channel_state = &mut *channel_lock;
2394 if let hash_map::Entry::Occupied(mut chan) = channel_state.by_id.entry(id) {
2396 if chan.get().get_counterparty_node_id() != path.first().unwrap().pubkey {
2397 return Err(APIError::RouteError{err: "Node ID mismatch on first hop!"});
2399 if !chan.get().is_live() {
2400 return Err(APIError::ChannelUnavailable{err: "Peer for first hop currently disconnected/pending monitor update!".to_owned()});
2402 break_chan_entry!(self, chan.get_mut().send_htlc_and_commit(
2403 htlc_msat, payment_hash.clone(), htlc_cltv, HTLCSource::OutboundRoute {
2405 session_priv: session_priv.clone(),
2406 first_hop_htlc_msat: htlc_msat,
2408 payment_secret: payment_secret.clone(),
2409 payment_params: payment_params.clone(),
2410 }, onion_packet, &self.logger),
2411 channel_state, chan)
2413 Some((update_add, commitment_signed, monitor_update)) => {
2414 if let Err(e) = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
2415 maybe_break_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::CommitmentFirst, false, true);
2416 // Note that MonitorUpdateFailed here indicates (per function docs)
2417 // that we will resend the commitment update once monitor updating
2418 // is restored. Therefore, we must return an error indicating that
2419 // it is unsafe to retry the payment wholesale, which we do in the
2420 // send_payment check for MonitorUpdateFailed, below.
2421 insert_outbound_payment!(); // Only do this after possibly break'ing on Perm failure above.
2422 return Err(APIError::MonitorUpdateFailed);
2424 insert_outbound_payment!();
2426 log_debug!(self.logger, "Sending payment along path resulted in a commitment_signed for channel {}", log_bytes!(chan.get().channel_id()));
2427 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
2428 node_id: path.first().unwrap().pubkey,
2429 updates: msgs::CommitmentUpdate {
2430 update_add_htlcs: vec![update_add],
2431 update_fulfill_htlcs: Vec::new(),
2432 update_fail_htlcs: Vec::new(),
2433 update_fail_malformed_htlcs: Vec::new(),
2439 None => { insert_outbound_payment!(); },
2441 } else { unreachable!(); }
2445 match handle_error!(self, err, path.first().unwrap().pubkey) {
2446 Ok(_) => unreachable!(),
2448 Err(APIError::ChannelUnavailable { err: e.err })
2453 /// Sends a payment along a given route.
2455 /// Value parameters are provided via the last hop in route, see documentation for RouteHop
2456 /// fields for more info.
2458 /// Note that if the payment_hash already exists elsewhere (eg you're sending a duplicative
2459 /// payment), we don't do anything to stop you! We always try to ensure that if the provided
2460 /// next hop knows the preimage to payment_hash they can claim an additional amount as
2461 /// specified in the last hop in the route! Thus, you should probably do your own
2462 /// payment_preimage tracking (which you should already be doing as they represent "proof of
2463 /// payment") and prevent double-sends yourself.
2465 /// May generate SendHTLCs message(s) event on success, which should be relayed.
2467 /// Each path may have a different return value, and PaymentSendValue may return a Vec with
2468 /// each entry matching the corresponding-index entry in the route paths, see
2469 /// PaymentSendFailure for more info.
2471 /// In general, a path may raise:
2472 /// * APIError::RouteError when an invalid route or forwarding parameter (cltv_delta, fee,
2473 /// node public key) is specified.
2474 /// * APIError::ChannelUnavailable if the next-hop channel is not available for updates
2475 /// (including due to previous monitor update failure or new permanent monitor update
2477 /// * APIError::MonitorUpdateFailed if a new monitor update failure prevented sending the
2478 /// relevant updates.
2480 /// Note that depending on the type of the PaymentSendFailure the HTLC may have been
2481 /// irrevocably committed to on our end. In such a case, do NOT retry the payment with a
2482 /// different route unless you intend to pay twice!
2484 /// payment_secret is unrelated to payment_hash (or PaymentPreimage) and exists to authenticate
2485 /// the sender to the recipient and prevent payment-probing (deanonymization) attacks. For
2486 /// newer nodes, it will be provided to you in the invoice. If you do not have one, the Route
2487 /// must not contain multiple paths as multi-path payments require a recipient-provided
2489 /// If a payment_secret *is* provided, we assume that the invoice had the payment_secret feature
2490 /// bit set (either as required or as available). If multiple paths are present in the Route,
2491 /// we assume the invoice had the basic_mpp feature set.
2492 pub fn send_payment(&self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>) -> Result<PaymentId, PaymentSendFailure> {
2493 self.send_payment_internal(route, payment_hash, payment_secret, None, None, None)
2496 fn send_payment_internal(&self, route: &Route, payment_hash: PaymentHash, payment_secret: &Option<PaymentSecret>, keysend_preimage: Option<PaymentPreimage>, payment_id: Option<PaymentId>, recv_value_msat: Option<u64>) -> Result<PaymentId, PaymentSendFailure> {
2497 if route.paths.len() < 1 {
2498 return Err(PaymentSendFailure::ParameterError(APIError::RouteError{err: "There must be at least one path to send over"}));
2500 if route.paths.len() > 10 {
2501 // This limit is completely arbitrary - there aren't any real fundamental path-count
2502 // limits. After we support retrying individual paths we should likely bump this, but
2503 // for now more than 10 paths likely carries too much one-path failure.
2504 return Err(PaymentSendFailure::ParameterError(APIError::RouteError{err: "Sending over more than 10 paths is not currently supported"}));
2506 if payment_secret.is_none() && route.paths.len() > 1 {
2507 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError{err: "Payment secret is required for multi-path payments".to_string()}));
2509 let mut total_value = 0;
2510 let our_node_id = self.get_our_node_id();
2511 let mut path_errs = Vec::with_capacity(route.paths.len());
2512 let payment_id = if let Some(id) = payment_id { id } else { PaymentId(self.keys_manager.get_secure_random_bytes()) };
2513 'path_check: for path in route.paths.iter() {
2514 if path.len() < 1 || path.len() > 20 {
2515 path_errs.push(Err(APIError::RouteError{err: "Path didn't go anywhere/had bogus size"}));
2516 continue 'path_check;
2518 for (idx, hop) in path.iter().enumerate() {
2519 if idx != path.len() - 1 && hop.pubkey == our_node_id {
2520 path_errs.push(Err(APIError::RouteError{err: "Path went through us but wasn't a simple rebalance loop to us"}));
2521 continue 'path_check;
2524 total_value += path.last().unwrap().fee_msat;
2525 path_errs.push(Ok(()));
2527 if path_errs.iter().any(|e| e.is_err()) {
2528 return Err(PaymentSendFailure::PathParameterError(path_errs));
2530 if let Some(amt_msat) = recv_value_msat {
2531 debug_assert!(amt_msat >= total_value);
2532 total_value = amt_msat;
2535 let cur_height = self.best_block.read().unwrap().height() + 1;
2536 let mut results = Vec::new();
2537 for path in route.paths.iter() {
2538 results.push(self.send_payment_along_path(&path, &route.payment_params, &payment_hash, payment_secret, total_value, cur_height, payment_id, &keysend_preimage));
2540 let mut has_ok = false;
2541 let mut has_err = false;
2542 let mut pending_amt_unsent = 0;
2543 let mut max_unsent_cltv_delta = 0;
2544 for (res, path) in results.iter().zip(route.paths.iter()) {
2545 if res.is_ok() { has_ok = true; }
2546 if res.is_err() { has_err = true; }
2547 if let &Err(APIError::MonitorUpdateFailed) = res {
2548 // MonitorUpdateFailed is inherently unsafe to retry, so we call it a
2552 } else if res.is_err() {
2553 pending_amt_unsent += path.last().unwrap().fee_msat;
2554 max_unsent_cltv_delta = cmp::max(max_unsent_cltv_delta, path.last().unwrap().cltv_expiry_delta);
2557 if has_err && has_ok {
2558 Err(PaymentSendFailure::PartialFailure {
2561 failed_paths_retry: if pending_amt_unsent != 0 {
2562 if let Some(payment_params) = &route.payment_params {
2563 Some(RouteParameters {
2564 payment_params: payment_params.clone(),
2565 final_value_msat: pending_amt_unsent,
2566 final_cltv_expiry_delta: max_unsent_cltv_delta,
2572 // If we failed to send any paths, we shouldn't have inserted the new PaymentId into
2573 // our `pending_outbound_payments` map at all.
2574 debug_assert!(self.pending_outbound_payments.lock().unwrap().get(&payment_id).is_none());
2575 Err(PaymentSendFailure::AllFailedRetrySafe(results.drain(..).map(|r| r.unwrap_err()).collect()))
2581 /// Retries a payment along the given [`Route`].
2583 /// Errors returned are a superset of those returned from [`send_payment`], so see
2584 /// [`send_payment`] documentation for more details on errors. This method will also error if the
2585 /// retry amount puts the payment more than 10% over the payment's total amount, if the payment
2586 /// for the given `payment_id` cannot be found (likely due to timeout or success), or if
2587 /// further retries have been disabled with [`abandon_payment`].
2589 /// [`send_payment`]: [`ChannelManager::send_payment`]
2590 /// [`abandon_payment`]: [`ChannelManager::abandon_payment`]
2591 pub fn retry_payment(&self, route: &Route, payment_id: PaymentId) -> Result<(), PaymentSendFailure> {
2592 const RETRY_OVERFLOW_PERCENTAGE: u64 = 10;
2593 for path in route.paths.iter() {
2594 if path.len() == 0 {
2595 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
2596 err: "length-0 path in route".to_string()
2601 let (total_msat, payment_hash, payment_secret) = {
2602 let outbounds = self.pending_outbound_payments.lock().unwrap();
2603 if let Some(payment) = outbounds.get(&payment_id) {
2605 PendingOutboundPayment::Retryable {
2606 total_msat, payment_hash, payment_secret, pending_amt_msat, ..
2608 let retry_amt_msat: u64 = route.paths.iter().map(|path| path.last().unwrap().fee_msat).sum();
2609 if retry_amt_msat + *pending_amt_msat > *total_msat * (100 + RETRY_OVERFLOW_PERCENTAGE) / 100 {
2610 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
2611 err: format!("retry_amt_msat of {} will put pending_amt_msat (currently: {}) more than 10% over total_payment_amt_msat of {}", retry_amt_msat, pending_amt_msat, total_msat).to_string()
2614 (*total_msat, *payment_hash, *payment_secret)
2616 PendingOutboundPayment::Legacy { .. } => {
2617 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
2618 err: "Unable to retry payments that were initially sent on LDK versions prior to 0.0.102".to_string()
2621 PendingOutboundPayment::Fulfilled { .. } => {
2622 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
2623 err: "Payment already completed".to_owned()
2626 PendingOutboundPayment::Abandoned { .. } => {
2627 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
2628 err: "Payment already abandoned (with some HTLCs still pending)".to_owned()
2633 return Err(PaymentSendFailure::ParameterError(APIError::APIMisuseError {
2634 err: format!("Payment with ID {} not found", log_bytes!(payment_id.0)),
2638 return self.send_payment_internal(route, payment_hash, &payment_secret, None, Some(payment_id), Some(total_msat)).map(|_| ())
2641 /// Signals that no further retries for the given payment will occur.
2643 /// After this method returns, any future calls to [`retry_payment`] for the given `payment_id`
2644 /// will fail with [`PaymentSendFailure::ParameterError`]. If no such event has been generated,
2645 /// an [`Event::PaymentFailed`] event will be generated as soon as there are no remaining
2646 /// pending HTLCs for this payment.
2648 /// Note that calling this method does *not* prevent a payment from succeeding. You must still
2649 /// wait until you receive either a [`Event::PaymentFailed`] or [`Event::PaymentSent`] event to
2650 /// determine the ultimate status of a payment.
2652 /// [`retry_payment`]: Self::retry_payment
2653 /// [`Event::PaymentFailed`]: events::Event::PaymentFailed
2654 /// [`Event::PaymentSent`]: events::Event::PaymentSent
2655 pub fn abandon_payment(&self, payment_id: PaymentId) {
2656 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
2658 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
2659 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
2660 if let Ok(()) = payment.get_mut().mark_abandoned() {
2661 if payment.get().remaining_parts() == 0 {
2662 self.pending_events.lock().unwrap().push(events::Event::PaymentFailed {
2664 payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"),
2672 /// Send a spontaneous payment, which is a payment that does not require the recipient to have
2673 /// generated an invoice. Optionally, you may specify the preimage. If you do choose to specify
2674 /// the preimage, it must be a cryptographically secure random value that no intermediate node
2675 /// would be able to guess -- otherwise, an intermediate node may claim the payment and it will
2676 /// never reach the recipient.
2678 /// See [`send_payment`] documentation for more details on the return value of this function.
2680 /// Similar to regular payments, you MUST NOT reuse a `payment_preimage` value. See
2681 /// [`send_payment`] for more information about the risks of duplicate preimage usage.
2683 /// Note that `route` must have exactly one path.
2685 /// [`send_payment`]: Self::send_payment
2686 pub fn send_spontaneous_payment(&self, route: &Route, payment_preimage: Option<PaymentPreimage>) -> Result<(PaymentHash, PaymentId), PaymentSendFailure> {
2687 let preimage = match payment_preimage {
2689 None => PaymentPreimage(self.keys_manager.get_secure_random_bytes()),
2691 let payment_hash = PaymentHash(Sha256::hash(&preimage.0).into_inner());
2692 match self.send_payment_internal(route, payment_hash, &None, Some(preimage), None, None) {
2693 Ok(payment_id) => Ok((payment_hash, payment_id)),
2698 /// Handles the generation of a funding transaction, optionally (for tests) with a function
2699 /// which checks the correctness of the funding transaction given the associated channel.
2700 fn funding_transaction_generated_intern<FundingOutput: Fn(&Channel<Signer>, &Transaction) -> Result<OutPoint, APIError>>(
2701 &self, temporary_channel_id: &[u8; 32], _counterparty_node_id: &PublicKey, funding_transaction: Transaction, find_funding_output: FundingOutput
2702 ) -> Result<(), APIError> {
2704 let (res, chan) = match self.channel_state.lock().unwrap().by_id.remove(temporary_channel_id) {
2706 let funding_txo = find_funding_output(&chan, &funding_transaction)?;
2708 (chan.get_outbound_funding_created(funding_transaction, funding_txo, &self.logger)
2709 .map_err(|e| if let ChannelError::Close(msg) = e {
2710 MsgHandleErrInternal::from_finish_shutdown(msg, chan.channel_id(), chan.get_user_id(), chan.force_shutdown(true), None)
2711 } else { unreachable!(); })
2714 None => { return Err(APIError::ChannelUnavailable { err: "No such channel".to_owned() }) },
2716 match handle_error!(self, res, chan.get_counterparty_node_id()) {
2717 Ok(funding_msg) => {
2720 Err(_) => { return Err(APIError::ChannelUnavailable {
2721 err: "Error deriving keys or signing initial commitment transactions - either our RNG or our counterparty's RNG is broken or the Signer refused to sign".to_owned()
2726 let mut channel_state = self.channel_state.lock().unwrap();
2727 channel_state.pending_msg_events.push(events::MessageSendEvent::SendFundingCreated {
2728 node_id: chan.get_counterparty_node_id(),
2731 match channel_state.by_id.entry(chan.channel_id()) {
2732 hash_map::Entry::Occupied(_) => {
2733 panic!("Generated duplicate funding txid?");
2735 hash_map::Entry::Vacant(e) => {
2743 pub(crate) fn funding_transaction_generated_unchecked(&self, temporary_channel_id: &[u8; 32], counterparty_node_id: &PublicKey, funding_transaction: Transaction, output_index: u16) -> Result<(), APIError> {
2744 self.funding_transaction_generated_intern(temporary_channel_id, counterparty_node_id, funding_transaction, |_, tx| {
2745 Ok(OutPoint { txid: tx.txid(), index: output_index })
2749 /// Call this upon creation of a funding transaction for the given channel.
2751 /// Returns an [`APIError::APIMisuseError`] if the funding_transaction spent non-SegWit outputs
2752 /// or if no output was found which matches the parameters in [`Event::FundingGenerationReady`].
2754 /// Returns [`APIError::ChannelUnavailable`] if a funding transaction has already been provided
2755 /// for the channel or if the channel has been closed as indicated by [`Event::ChannelClosed`].
2757 /// May panic if the output found in the funding transaction is duplicative with some other
2758 /// channel (note that this should be trivially prevented by using unique funding transaction
2759 /// keys per-channel).
2761 /// Do NOT broadcast the funding transaction yourself. When we have safely received our
2762 /// counterparty's signature the funding transaction will automatically be broadcast via the
2763 /// [`BroadcasterInterface`] provided when this `ChannelManager` was constructed.
2765 /// Note that this includes RBF or similar transaction replacement strategies - lightning does
2766 /// not currently support replacing a funding transaction on an existing channel. Instead,
2767 /// create a new channel with a conflicting funding transaction.
2769 /// [`Event::FundingGenerationReady`]: crate::util::events::Event::FundingGenerationReady
2770 /// [`Event::ChannelClosed`]: crate::util::events::Event::ChannelClosed
2771 pub fn funding_transaction_generated(&self, temporary_channel_id: &[u8; 32], counterparty_node_id: &PublicKey, funding_transaction: Transaction) -> Result<(), APIError> {
2772 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
2774 for inp in funding_transaction.input.iter() {
2775 if inp.witness.is_empty() {
2776 return Err(APIError::APIMisuseError {
2777 err: "Funding transaction must be fully signed and spend Segwit outputs".to_owned()
2781 self.funding_transaction_generated_intern(temporary_channel_id, counterparty_node_id, funding_transaction, |chan, tx| {
2782 let mut output_index = None;
2783 let expected_spk = chan.get_funding_redeemscript().to_v0_p2wsh();
2784 for (idx, outp) in tx.output.iter().enumerate() {
2785 if outp.script_pubkey == expected_spk && outp.value == chan.get_value_satoshis() {
2786 if output_index.is_some() {
2787 return Err(APIError::APIMisuseError {
2788 err: "Multiple outputs matched the expected script and value".to_owned()
2791 if idx > u16::max_value() as usize {
2792 return Err(APIError::APIMisuseError {
2793 err: "Transaction had more than 2^16 outputs, which is not supported".to_owned()
2796 output_index = Some(idx as u16);
2799 if output_index.is_none() {
2800 return Err(APIError::APIMisuseError {
2801 err: "No output matched the script_pubkey and value in the FundingGenerationReady event".to_owned()
2804 Ok(OutPoint { txid: tx.txid(), index: output_index.unwrap() })
2809 // Messages of up to 64KB should never end up more than half full with addresses, as that would
2810 // be absurd. We ensure this by checking that at least 500 (our stated public contract on when
2811 // broadcast_node_announcement panics) of the maximum-length addresses would fit in a 64KB
2813 const HALF_MESSAGE_IS_ADDRS: u32 = ::core::u16::MAX as u32 / (NetAddress::MAX_LEN as u32 + 1) / 2;
2816 // ...by failing to compile if the number of addresses that would be half of a message is
2817 // smaller than 500:
2818 const STATIC_ASSERT: u32 = Self::HALF_MESSAGE_IS_ADDRS - 500;
2820 /// Regenerates channel_announcements and generates a signed node_announcement from the given
2821 /// arguments, providing them in corresponding events via
2822 /// [`get_and_clear_pending_msg_events`], if at least one public channel has been confirmed
2823 /// on-chain. This effectively re-broadcasts all channel announcements and sends our node
2824 /// announcement to ensure that the lightning P2P network is aware of the channels we have and
2825 /// our network addresses.
2827 /// `rgb` is a node "color" and `alias` is a printable human-readable string to describe this
2828 /// node to humans. They carry no in-protocol meaning.
2830 /// `addresses` represent the set (possibly empty) of socket addresses on which this node
2831 /// accepts incoming connections. These will be included in the node_announcement, publicly
2832 /// tying these addresses together and to this node. If you wish to preserve user privacy,
2833 /// addresses should likely contain only Tor Onion addresses.
2835 /// Panics if `addresses` is absurdly large (more than 500).
2837 /// [`get_and_clear_pending_msg_events`]: MessageSendEventsProvider::get_and_clear_pending_msg_events
2838 pub fn broadcast_node_announcement(&self, rgb: [u8; 3], alias: [u8; 32], mut addresses: Vec<NetAddress>) {
2839 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
2841 if addresses.len() > 500 {
2842 panic!("More than half the message size was taken up by public addresses!");
2845 // While all existing nodes handle unsorted addresses just fine, the spec requires that
2846 // addresses be sorted for future compatibility.
2847 addresses.sort_by_key(|addr| addr.get_id());
2849 let announcement = msgs::UnsignedNodeAnnouncement {
2850 features: NodeFeatures::known(),
2851 timestamp: self.last_node_announcement_serial.fetch_add(1, Ordering::AcqRel) as u32,
2852 node_id: self.get_our_node_id(),
2853 rgb, alias, addresses,
2854 excess_address_data: Vec::new(),
2855 excess_data: Vec::new(),
2857 let msghash = hash_to_message!(&Sha256dHash::hash(&announcement.encode()[..])[..]);
2858 let node_announce_sig = sign(&self.secp_ctx, &msghash, &self.our_network_key);
2860 let mut channel_state_lock = self.channel_state.lock().unwrap();
2861 let channel_state = &mut *channel_state_lock;
2863 let mut announced_chans = false;
2864 for (_, chan) in channel_state.by_id.iter() {
2865 if let Some(msg) = chan.get_signed_channel_announcement(self.get_our_node_id(), self.genesis_hash.clone(), self.best_block.read().unwrap().height()) {
2866 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelAnnouncement {
2868 update_msg: match self.get_channel_update_for_broadcast(chan) {
2873 announced_chans = true;
2875 // If the channel is not public or has not yet reached funding_locked, check the
2876 // next channel. If we don't yet have any public channels, we'll skip the broadcast
2877 // below as peers may not accept it without channels on chain first.
2881 if announced_chans {
2882 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastNodeAnnouncement {
2883 msg: msgs::NodeAnnouncement {
2884 signature: node_announce_sig,
2885 contents: announcement
2891 /// Processes HTLCs which are pending waiting on random forward delay.
2893 /// Should only really ever be called in response to a PendingHTLCsForwardable event.
2894 /// Will likely generate further events.
2895 pub fn process_pending_htlc_forwards(&self) {
2896 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
2898 let mut new_events = Vec::new();
2899 let mut failed_forwards = Vec::new();
2900 let mut phantom_receives: Vec<(u64, OutPoint, Vec<(PendingHTLCInfo, u64)>)> = Vec::new();
2901 let mut handle_errors = Vec::new();
2903 let mut channel_state_lock = self.channel_state.lock().unwrap();
2904 let channel_state = &mut *channel_state_lock;
2906 for (short_chan_id, mut pending_forwards) in channel_state.forward_htlcs.drain() {
2907 if short_chan_id != 0 {
2908 let forward_chan_id = match channel_state.short_to_id.get(&short_chan_id) {
2909 Some(chan_id) => chan_id.clone(),
2911 for forward_info in pending_forwards.drain(..) {
2912 match forward_info {
2913 HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info: PendingHTLCInfo {
2914 routing, incoming_shared_secret, payment_hash, amt_to_forward, outgoing_cltv_value },
2915 prev_funding_outpoint } => {
2916 macro_rules! fail_forward {
2917 ($msg: expr, $err_code: expr, $err_data: expr, $phantom_ss: expr) => {
2919 log_info!(self.logger, "Failed to accept/forward incoming HTLC: {}", $msg);
2920 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
2921 short_channel_id: prev_short_channel_id,
2922 outpoint: prev_funding_outpoint,
2923 htlc_id: prev_htlc_id,
2924 incoming_packet_shared_secret: incoming_shared_secret,
2925 phantom_shared_secret: $phantom_ss,
2927 failed_forwards.push((htlc_source, payment_hash,
2928 HTLCFailReason::Reason { failure_code: $err_code, data: $err_data }
2934 if let PendingHTLCRouting::Forward { onion_packet, .. } = routing {
2935 let phantom_secret_res = self.keys_manager.get_node_secret(Recipient::PhantomNode);
2936 if phantom_secret_res.is_ok() && fake_scid::is_valid_phantom(&self.fake_scid_rand_bytes, short_chan_id) {
2937 let phantom_shared_secret = SharedSecret::new(&onion_packet.public_key.unwrap(), &phantom_secret_res.unwrap()).secret_bytes();
2938 let next_hop = match onion_utils::decode_next_hop(phantom_shared_secret, &onion_packet.hop_data, onion_packet.hmac, payment_hash) {
2940 Err(onion_utils::OnionDecodeErr::Malformed { err_msg, err_code }) => {
2941 let sha256_of_onion = Sha256::hash(&onion_packet.hop_data).into_inner();
2942 // In this scenario, the phantom would have sent us an
2943 // `update_fail_malformed_htlc`, meaning here we encrypt the error as
2944 // if it came from us (the second-to-last hop) but contains the sha256
2946 fail_forward!(err_msg, err_code, sha256_of_onion.to_vec(), None);
2948 Err(onion_utils::OnionDecodeErr::Relay { err_msg, err_code }) => {
2949 fail_forward!(err_msg, err_code, Vec::new(), Some(phantom_shared_secret));
2953 onion_utils::Hop::Receive(hop_data) => {
2954 match self.construct_recv_pending_htlc_info(hop_data, incoming_shared_secret, payment_hash, amt_to_forward, outgoing_cltv_value, Some(phantom_shared_secret)) {
2955 Ok(info) => phantom_receives.push((prev_short_channel_id, prev_funding_outpoint, vec![(info, prev_htlc_id)])),
2956 Err(ReceiveError { err_code, err_data, msg }) => fail_forward!(msg, err_code, err_data, Some(phantom_shared_secret))
2962 fail_forward!(format!("Unknown short channel id {} for forward HTLC", short_chan_id), 0x4000 | 10, Vec::new(), None);
2965 fail_forward!(format!("Unknown short channel id {} for forward HTLC", short_chan_id), 0x4000 | 10, Vec::new(), None);
2968 HTLCForwardInfo::FailHTLC { .. } => {
2969 // Channel went away before we could fail it. This implies
2970 // the channel is now on chain and our counterparty is
2971 // trying to broadcast the HTLC-Timeout, but that's their
2972 // problem, not ours.
2979 if let hash_map::Entry::Occupied(mut chan) = channel_state.by_id.entry(forward_chan_id) {
2980 let mut add_htlc_msgs = Vec::new();
2981 let mut fail_htlc_msgs = Vec::new();
2982 for forward_info in pending_forwards.drain(..) {
2983 match forward_info {
2984 HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info: PendingHTLCInfo {
2985 routing: PendingHTLCRouting::Forward {
2987 }, incoming_shared_secret, payment_hash, amt_to_forward, outgoing_cltv_value },
2988 prev_funding_outpoint } => {
2989 log_trace!(self.logger, "Adding HTLC from short id {} with payment_hash {} to channel with short id {} after delay", prev_short_channel_id, log_bytes!(payment_hash.0), short_chan_id);
2990 let htlc_source = HTLCSource::PreviousHopData(HTLCPreviousHopData {
2991 short_channel_id: prev_short_channel_id,
2992 outpoint: prev_funding_outpoint,
2993 htlc_id: prev_htlc_id,
2994 incoming_packet_shared_secret: incoming_shared_secret,
2995 // Phantom payments are only PendingHTLCRouting::Receive.
2996 phantom_shared_secret: None,
2998 match chan.get_mut().send_htlc(amt_to_forward, payment_hash, outgoing_cltv_value, htlc_source.clone(), onion_packet, &self.logger) {
3000 if let ChannelError::Ignore(msg) = e {
3001 log_trace!(self.logger, "Failed to forward HTLC with payment_hash {}: {}", log_bytes!(payment_hash.0), msg);
3003 panic!("Stated return value requirements in send_htlc() were not met");
3005 let (failure_code, data) = self.get_htlc_temp_fail_err_and_data(0x1000|7, short_chan_id, chan.get());
3006 failed_forwards.push((htlc_source, payment_hash,
3007 HTLCFailReason::Reason { failure_code, data }
3013 Some(msg) => { add_htlc_msgs.push(msg); },
3015 // Nothing to do here...we're waiting on a remote
3016 // revoke_and_ack before we can add anymore HTLCs. The Channel
3017 // will automatically handle building the update_add_htlc and
3018 // commitment_signed messages when we can.
3019 // TODO: Do some kind of timer to set the channel as !is_live()
3020 // as we don't really want others relying on us relaying through
3021 // this channel currently :/.
3027 HTLCForwardInfo::AddHTLC { .. } => {
3028 panic!("short_channel_id != 0 should imply any pending_forward entries are of type Forward");
3030 HTLCForwardInfo::FailHTLC { htlc_id, err_packet } => {
3031 log_trace!(self.logger, "Failing HTLC back to channel with short id {} (backward HTLC ID {}) after delay", short_chan_id, htlc_id);
3032 match chan.get_mut().get_update_fail_htlc(htlc_id, err_packet, &self.logger) {
3034 if let ChannelError::Ignore(msg) = e {
3035 log_trace!(self.logger, "Failed to fail HTLC with ID {} backwards to short_id {}: {}", htlc_id, short_chan_id, msg);
3037 panic!("Stated return value requirements in get_update_fail_htlc() were not met");
3039 // fail-backs are best-effort, we probably already have one
3040 // pending, and if not that's OK, if not, the channel is on
3041 // the chain and sending the HTLC-Timeout is their problem.
3044 Ok(Some(msg)) => { fail_htlc_msgs.push(msg); },
3046 // Nothing to do here...we're waiting on a remote
3047 // revoke_and_ack before we can update the commitment
3048 // transaction. The Channel will automatically handle
3049 // building the update_fail_htlc and commitment_signed
3050 // messages when we can.
3051 // We don't need any kind of timer here as they should fail
3052 // the channel onto the chain if they can't get our
3053 // update_fail_htlc in time, it's not our problem.
3060 if !add_htlc_msgs.is_empty() || !fail_htlc_msgs.is_empty() {
3061 let (commitment_msg, monitor_update) = match chan.get_mut().send_commitment(&self.logger) {
3064 // We surely failed send_commitment due to bad keys, in that case
3065 // close channel and then send error message to peer.
3066 let counterparty_node_id = chan.get().get_counterparty_node_id();
3067 let err: Result<(), _> = match e {
3068 ChannelError::Ignore(_) | ChannelError::Warn(_) => {
3069 panic!("Stated return value requirements in send_commitment() were not met");
3071 ChannelError::Close(msg) => {
3072 log_trace!(self.logger, "Closing channel {} due to Close-required error: {}", log_bytes!(chan.key()[..]), msg);
3073 let mut channel = remove_channel!(self, channel_state, chan);
3074 // ChannelClosed event is generated by handle_error for us.
3075 Err(MsgHandleErrInternal::from_finish_shutdown(msg, channel.channel_id(), channel.get_user_id(), channel.force_shutdown(true), self.get_channel_update_for_broadcast(&channel).ok()))
3077 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"); }
3079 handle_errors.push((counterparty_node_id, err));
3083 if let Err(e) = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
3084 handle_errors.push((chan.get().get_counterparty_node_id(), handle_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::CommitmentFirst, false, true)));
3087 log_debug!(self.logger, "Forwarding HTLCs resulted in a commitment update with {} HTLCs added and {} HTLCs failed for channel {}",
3088 add_htlc_msgs.len(), fail_htlc_msgs.len(), log_bytes!(chan.get().channel_id()));
3089 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
3090 node_id: chan.get().get_counterparty_node_id(),
3091 updates: msgs::CommitmentUpdate {
3092 update_add_htlcs: add_htlc_msgs,
3093 update_fulfill_htlcs: Vec::new(),
3094 update_fail_htlcs: fail_htlc_msgs,
3095 update_fail_malformed_htlcs: Vec::new(),
3097 commitment_signed: commitment_msg,
3105 for forward_info in pending_forwards.drain(..) {
3106 match forward_info {
3107 HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_htlc_id, forward_info: PendingHTLCInfo {
3108 routing, incoming_shared_secret, payment_hash, amt_to_forward, .. },
3109 prev_funding_outpoint } => {
3110 let (cltv_expiry, onion_payload, payment_data, phantom_shared_secret) = match routing {
3111 PendingHTLCRouting::Receive { payment_data, incoming_cltv_expiry, phantom_shared_secret } => {
3112 let _legacy_hop_data = payment_data.clone();
3113 (incoming_cltv_expiry, OnionPayload::Invoice { _legacy_hop_data }, Some(payment_data), phantom_shared_secret)
3115 PendingHTLCRouting::ReceiveKeysend { payment_preimage, incoming_cltv_expiry } =>
3116 (incoming_cltv_expiry, OnionPayload::Spontaneous(payment_preimage), None, None),
3118 panic!("short_channel_id == 0 should imply any pending_forward entries are of type Receive");
3121 let claimable_htlc = ClaimableHTLC {
3122 prev_hop: HTLCPreviousHopData {
3123 short_channel_id: prev_short_channel_id,
3124 outpoint: prev_funding_outpoint,
3125 htlc_id: prev_htlc_id,
3126 incoming_packet_shared_secret: incoming_shared_secret,
3127 phantom_shared_secret,
3129 value: amt_to_forward,
3131 total_msat: if let Some(data) = &payment_data { data.total_msat } else { amt_to_forward },
3136 macro_rules! fail_htlc {
3138 let mut htlc_msat_height_data = byte_utils::be64_to_array($htlc.value).to_vec();
3139 htlc_msat_height_data.extend_from_slice(
3140 &byte_utils::be32_to_array(self.best_block.read().unwrap().height()),
3142 failed_forwards.push((HTLCSource::PreviousHopData(HTLCPreviousHopData {
3143 short_channel_id: $htlc.prev_hop.short_channel_id,
3144 outpoint: prev_funding_outpoint,
3145 htlc_id: $htlc.prev_hop.htlc_id,
3146 incoming_packet_shared_secret: $htlc.prev_hop.incoming_packet_shared_secret,
3147 phantom_shared_secret,
3149 HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: htlc_msat_height_data }
3154 macro_rules! check_total_value {
3155 ($payment_data: expr, $payment_preimage: expr) => {{
3156 let mut payment_received_generated = false;
3157 let htlcs = channel_state.claimable_htlcs.entry(payment_hash)
3158 .or_insert(Vec::new());
3159 if htlcs.len() == 1 {
3160 if let OnionPayload::Spontaneous(_) = htlcs[0].onion_payload {
3161 log_trace!(self.logger, "Failing new HTLC with payment_hash {} as we already had an existing keysend HTLC with the same payment hash", log_bytes!(payment_hash.0));
3162 fail_htlc!(claimable_htlc);
3166 let mut total_value = claimable_htlc.value;
3167 for htlc in htlcs.iter() {
3168 total_value += htlc.value;
3169 match &htlc.onion_payload {
3170 OnionPayload::Invoice { .. } => {
3171 if htlc.total_msat != $payment_data.total_msat {
3172 log_trace!(self.logger, "Failing HTLCs with payment_hash {} as the HTLCs had inconsistent total values (eg {} and {})",
3173 log_bytes!(payment_hash.0), $payment_data.total_msat, htlc.total_msat);
3174 total_value = msgs::MAX_VALUE_MSAT;
3176 if total_value >= msgs::MAX_VALUE_MSAT { break; }
3178 _ => unreachable!(),
3181 if total_value >= msgs::MAX_VALUE_MSAT || total_value > $payment_data.total_msat {
3182 log_trace!(self.logger, "Failing HTLCs with payment_hash {} as the total value {} ran over expected value {} (or HTLCs were inconsistent)",
3183 log_bytes!(payment_hash.0), total_value, $payment_data.total_msat);
3184 fail_htlc!(claimable_htlc);
3185 } else if total_value == $payment_data.total_msat {
3186 htlcs.push(claimable_htlc);
3187 new_events.push(events::Event::PaymentReceived {
3189 purpose: events::PaymentPurpose::InvoicePayment {
3190 payment_preimage: $payment_preimage,
3191 payment_secret: $payment_data.payment_secret,
3195 payment_received_generated = true;
3197 // Nothing to do - we haven't reached the total
3198 // payment value yet, wait until we receive more
3200 htlcs.push(claimable_htlc);
3202 payment_received_generated
3206 // Check that the payment hash and secret are known. Note that we
3207 // MUST take care to handle the "unknown payment hash" and
3208 // "incorrect payment secret" cases here identically or we'd expose
3209 // that we are the ultimate recipient of the given payment hash.
3210 // Further, we must not expose whether we have any other HTLCs
3211 // associated with the same payment_hash pending or not.
3212 let mut payment_secrets = self.pending_inbound_payments.lock().unwrap();
3213 match payment_secrets.entry(payment_hash) {
3214 hash_map::Entry::Vacant(_) => {
3215 match claimable_htlc.onion_payload {
3216 OnionPayload::Invoice { .. } => {
3217 let payment_data = payment_data.unwrap();
3218 let payment_preimage = match inbound_payment::verify(payment_hash, &payment_data, self.highest_seen_timestamp.load(Ordering::Acquire) as u64, &self.inbound_payment_key, &self.logger) {
3219 Ok(payment_preimage) => payment_preimage,
3221 fail_htlc!(claimable_htlc);
3225 check_total_value!(payment_data, payment_preimage);
3227 OnionPayload::Spontaneous(preimage) => {
3228 match channel_state.claimable_htlcs.entry(payment_hash) {
3229 hash_map::Entry::Vacant(e) => {
3230 e.insert(vec![claimable_htlc]);
3231 new_events.push(events::Event::PaymentReceived {
3233 amt: amt_to_forward,
3234 purpose: events::PaymentPurpose::SpontaneousPayment(preimage),
3237 hash_map::Entry::Occupied(_) => {
3238 log_trace!(self.logger, "Failing new keysend HTLC with payment_hash {} for a duplicative payment hash", log_bytes!(payment_hash.0));
3239 fail_htlc!(claimable_htlc);
3245 hash_map::Entry::Occupied(inbound_payment) => {
3246 if payment_data.is_none() {
3247 log_trace!(self.logger, "Failing new keysend HTLC with payment_hash {} because we already have an inbound payment with the same payment hash", log_bytes!(payment_hash.0));
3248 fail_htlc!(claimable_htlc);
3251 let payment_data = payment_data.unwrap();
3252 if inbound_payment.get().payment_secret != payment_data.payment_secret {
3253 log_trace!(self.logger, "Failing new HTLC with payment_hash {} as it didn't match our expected payment secret.", log_bytes!(payment_hash.0));
3254 fail_htlc!(claimable_htlc);
3255 } else if inbound_payment.get().min_value_msat.is_some() && payment_data.total_msat < inbound_payment.get().min_value_msat.unwrap() {
3256 log_trace!(self.logger, "Failing new HTLC with payment_hash {} as it didn't match our minimum value (had {}, needed {}).",
3257 log_bytes!(payment_hash.0), payment_data.total_msat, inbound_payment.get().min_value_msat.unwrap());
3258 fail_htlc!(claimable_htlc);
3260 let payment_received_generated = check_total_value!(payment_data, inbound_payment.get().payment_preimage);
3261 if payment_received_generated {
3262 inbound_payment.remove_entry();
3268 HTLCForwardInfo::FailHTLC { .. } => {
3269 panic!("Got pending fail of our own HTLC");
3277 for (htlc_source, payment_hash, failure_reason) in failed_forwards.drain(..) {
3278 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), htlc_source, &payment_hash, failure_reason);
3280 self.forward_htlcs(&mut phantom_receives);
3282 for (counterparty_node_id, err) in handle_errors.drain(..) {
3283 let _ = handle_error!(self, err, counterparty_node_id);
3286 if new_events.is_empty() { return }
3287 let mut events = self.pending_events.lock().unwrap();
3288 events.append(&mut new_events);
3291 /// Free the background events, generally called from timer_tick_occurred.
3293 /// Exposed for testing to allow us to process events quickly without generating accidental
3294 /// BroadcastChannelUpdate events in timer_tick_occurred.
3296 /// Expects the caller to have a total_consistency_lock read lock.
3297 fn process_background_events(&self) -> bool {
3298 let mut background_events = Vec::new();
3299 mem::swap(&mut *self.pending_background_events.lock().unwrap(), &mut background_events);
3300 if background_events.is_empty() {
3304 for event in background_events.drain(..) {
3306 BackgroundEvent::ClosingMonitorUpdate((funding_txo, update)) => {
3307 // The channel has already been closed, so no use bothering to care about the
3308 // monitor updating completing.
3309 let _ = self.chain_monitor.update_channel(funding_txo, update);
3316 #[cfg(any(test, feature = "_test_utils"))]
3317 /// Process background events, for functional testing
3318 pub fn test_process_background_events(&self) {
3319 self.process_background_events();
3322 fn update_channel_fee(&self, short_to_id: &mut HashMap<u64, [u8; 32]>, pending_msg_events: &mut Vec<events::MessageSendEvent>, chan_id: &[u8; 32], chan: &mut Channel<Signer>, new_feerate: u32) -> (bool, NotifyOption, Result<(), MsgHandleErrInternal>) {
3323 if !chan.is_outbound() { return (true, NotifyOption::SkipPersist, Ok(())); }
3324 // If the feerate has decreased by less than half, don't bother
3325 if new_feerate <= chan.get_feerate() && new_feerate * 2 > chan.get_feerate() {
3326 log_trace!(self.logger, "Channel {} does not qualify for a feerate change from {} to {}.",
3327 log_bytes!(chan_id[..]), chan.get_feerate(), new_feerate);
3328 return (true, NotifyOption::SkipPersist, Ok(()));
3330 if !chan.is_live() {
3331 log_trace!(self.logger, "Channel {} does not qualify for a feerate change from {} to {} as it cannot currently be updated (probably the peer is disconnected).",
3332 log_bytes!(chan_id[..]), chan.get_feerate(), new_feerate);
3333 return (true, NotifyOption::SkipPersist, Ok(()));
3335 log_trace!(self.logger, "Channel {} qualifies for a feerate change from {} to {}.",
3336 log_bytes!(chan_id[..]), chan.get_feerate(), new_feerate);
3338 let mut retain_channel = true;
3339 let res = match chan.send_update_fee_and_commit(new_feerate, &self.logger) {
3342 let (drop, res) = convert_chan_err!(self, e, short_to_id, chan, chan_id);
3343 if drop { retain_channel = false; }
3347 let ret_err = match res {
3348 Ok(Some((update_fee, commitment_signed, monitor_update))) => {
3349 if let Err(e) = self.chain_monitor.update_channel(chan.get_funding_txo().unwrap(), monitor_update) {
3350 let (res, drop) = handle_monitor_err!(self, e, short_to_id, chan, RAACommitmentOrder::CommitmentFirst, chan_id, COMMITMENT_UPDATE_ONLY);
3351 if drop { retain_channel = false; }
3354 pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
3355 node_id: chan.get_counterparty_node_id(),
3356 updates: msgs::CommitmentUpdate {
3357 update_add_htlcs: Vec::new(),
3358 update_fulfill_htlcs: Vec::new(),
3359 update_fail_htlcs: Vec::new(),
3360 update_fail_malformed_htlcs: Vec::new(),
3361 update_fee: Some(update_fee),
3371 (retain_channel, NotifyOption::DoPersist, ret_err)
3375 /// In chanmon_consistency we want to sometimes do the channel fee updates done in
3376 /// timer_tick_occurred, but we can't generate the disabled channel updates as it considers
3377 /// these a fuzz failure (as they usually indicate a channel force-close, which is exactly what
3378 /// it wants to detect). Thus, we have a variant exposed here for its benefit.
3379 pub fn maybe_update_chan_fees(&self) {
3380 PersistenceNotifierGuard::optionally_notify(&self.total_consistency_lock, &self.persistence_notifier, || {
3381 let mut should_persist = NotifyOption::SkipPersist;
3383 let new_feerate = self.fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
3385 let mut handle_errors = Vec::new();
3387 let mut channel_state_lock = self.channel_state.lock().unwrap();
3388 let channel_state = &mut *channel_state_lock;
3389 let pending_msg_events = &mut channel_state.pending_msg_events;
3390 let short_to_id = &mut channel_state.short_to_id;
3391 channel_state.by_id.retain(|chan_id, chan| {
3392 let (retain_channel, chan_needs_persist, err) = self.update_channel_fee(short_to_id, pending_msg_events, chan_id, chan, new_feerate);
3393 if chan_needs_persist == NotifyOption::DoPersist { should_persist = NotifyOption::DoPersist; }
3395 handle_errors.push(err);
3405 /// Performs actions which should happen on startup and roughly once per minute thereafter.
3407 /// This currently includes:
3408 /// * Increasing or decreasing the on-chain feerate estimates for our outbound channels,
3409 /// * Broadcasting `ChannelUpdate` messages if we've been disconnected from our peer for more
3410 /// than a minute, informing the network that they should no longer attempt to route over
3413 /// Note that this may cause reentrancy through `chain::Watch::update_channel` calls or feerate
3414 /// estimate fetches.
3415 pub fn timer_tick_occurred(&self) {
3416 PersistenceNotifierGuard::optionally_notify(&self.total_consistency_lock, &self.persistence_notifier, || {
3417 let mut should_persist = NotifyOption::SkipPersist;
3418 if self.process_background_events() { should_persist = NotifyOption::DoPersist; }
3420 let new_feerate = self.fee_estimator.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
3422 let mut handle_errors = Vec::new();
3423 let mut timed_out_mpp_htlcs = Vec::new();
3425 let mut channel_state_lock = self.channel_state.lock().unwrap();
3426 let channel_state = &mut *channel_state_lock;
3427 let pending_msg_events = &mut channel_state.pending_msg_events;
3428 let short_to_id = &mut channel_state.short_to_id;
3429 channel_state.by_id.retain(|chan_id, chan| {
3430 let counterparty_node_id = chan.get_counterparty_node_id();
3431 let (retain_channel, chan_needs_persist, err) = self.update_channel_fee(short_to_id, pending_msg_events, chan_id, chan, new_feerate);
3432 if chan_needs_persist == NotifyOption::DoPersist { should_persist = NotifyOption::DoPersist; }
3434 handle_errors.push((err, counterparty_node_id));
3436 if !retain_channel { return false; }
3438 if let Err(e) = chan.timer_check_closing_negotiation_progress() {
3439 let (needs_close, err) = convert_chan_err!(self, e, short_to_id, chan, chan_id);
3440 handle_errors.push((Err(err), chan.get_counterparty_node_id()));
3441 if needs_close { return false; }
3444 match chan.channel_update_status() {
3445 ChannelUpdateStatus::Enabled if !chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::DisabledStaged),
3446 ChannelUpdateStatus::Disabled if chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::EnabledStaged),
3447 ChannelUpdateStatus::DisabledStaged if chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::Enabled),
3448 ChannelUpdateStatus::EnabledStaged if !chan.is_live() => chan.set_channel_update_status(ChannelUpdateStatus::Disabled),
3449 ChannelUpdateStatus::DisabledStaged if !chan.is_live() => {
3450 if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
3451 pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
3455 should_persist = NotifyOption::DoPersist;
3456 chan.set_channel_update_status(ChannelUpdateStatus::Disabled);
3458 ChannelUpdateStatus::EnabledStaged if chan.is_live() => {
3459 if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
3460 pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
3464 should_persist = NotifyOption::DoPersist;
3465 chan.set_channel_update_status(ChannelUpdateStatus::Enabled);
3473 channel_state.claimable_htlcs.retain(|payment_hash, htlcs| {
3474 if htlcs.is_empty() {
3475 // This should be unreachable
3476 debug_assert!(false);
3479 if let OnionPayload::Invoice { .. } = htlcs[0].onion_payload {
3480 // Check if we've received all the parts we need for an MPP (the value of the parts adds to total_msat).
3481 // In this case we're not going to handle any timeouts of the parts here.
3482 if htlcs[0].total_msat == htlcs.iter().fold(0, |total, htlc| total + htlc.value) {
3484 } else if htlcs.into_iter().any(|htlc| {
3485 htlc.timer_ticks += 1;
3486 return htlc.timer_ticks >= MPP_TIMEOUT_TICKS
3488 timed_out_mpp_htlcs.extend(htlcs.into_iter().map(|htlc| (htlc.prev_hop.clone(), payment_hash.clone())));
3496 for htlc_source in timed_out_mpp_htlcs.drain(..) {
3497 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), HTLCSource::PreviousHopData(htlc_source.0), &htlc_source.1, HTLCFailReason::Reason { failure_code: 23, data: Vec::new() });
3500 for (err, counterparty_node_id) in handle_errors.drain(..) {
3501 let _ = handle_error!(self, err, counterparty_node_id);
3507 /// Indicates that the preimage for payment_hash is unknown or the received amount is incorrect
3508 /// after a PaymentReceived event, failing the HTLC back to its origin and freeing resources
3509 /// along the path (including in our own channel on which we received it).
3510 /// Returns false if no payment was found to fail backwards, true if the process of failing the
3511 /// HTLC backwards has been started.
3512 pub fn fail_htlc_backwards(&self, payment_hash: &PaymentHash) -> bool {
3513 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
3515 let mut channel_state = Some(self.channel_state.lock().unwrap());
3516 let removed_source = channel_state.as_mut().unwrap().claimable_htlcs.remove(payment_hash);
3517 if let Some(mut sources) = removed_source {
3518 for htlc in sources.drain(..) {
3519 if channel_state.is_none() { channel_state = Some(self.channel_state.lock().unwrap()); }
3520 let mut htlc_msat_height_data = byte_utils::be64_to_array(htlc.value).to_vec();
3521 htlc_msat_height_data.extend_from_slice(&byte_utils::be32_to_array(
3522 self.best_block.read().unwrap().height()));
3523 self.fail_htlc_backwards_internal(channel_state.take().unwrap(),
3524 HTLCSource::PreviousHopData(htlc.prev_hop), payment_hash,
3525 HTLCFailReason::Reason { failure_code: 0x4000 | 15, data: htlc_msat_height_data });
3531 /// Gets an HTLC onion failure code and error data for an `UPDATE` error, given the error code
3532 /// that we want to return and a channel.
3534 /// This is for failures on the channel on which the HTLC was *received*, not failures
3536 fn get_htlc_inbound_temp_fail_err_and_data(&self, desired_err_code: u16, chan: &Channel<Signer>) -> (u16, Vec<u8>) {
3537 // We can't be sure what SCID was used when relaying inbound towards us, so we have to
3538 // guess somewhat. If its a public channel, we figure best to just use the real SCID (as
3539 // we're not leaking that we have a channel with the counterparty), otherwise we try to use
3540 // an inbound SCID alias before the real SCID.
3541 let scid_pref = if chan.should_announce() {
3542 chan.get_short_channel_id().or(chan.latest_inbound_scid_alias())
3544 chan.latest_inbound_scid_alias().or(chan.get_short_channel_id())
3546 if let Some(scid) = scid_pref {
3547 self.get_htlc_temp_fail_err_and_data(desired_err_code, scid, chan)
3549 (0x4000|10, Vec::new())
3554 /// Gets an HTLC onion failure code and error data for an `UPDATE` error, given the error code
3555 /// that we want to return and a channel.
3556 fn get_htlc_temp_fail_err_and_data(&self, desired_err_code: u16, scid: u64, chan: &Channel<Signer>) -> (u16, Vec<u8>) {
3557 debug_assert_eq!(desired_err_code & 0x1000, 0x1000);
3558 if let Ok(upd) = self.get_channel_update_for_onion(scid, chan) {
3559 let mut enc = VecWriter(Vec::with_capacity(upd.serialized_length() + 6));
3560 if desired_err_code == 0x1000 | 20 {
3561 // TODO: underspecified, follow https://github.com/lightning/bolts/issues/791
3562 0u16.write(&mut enc).expect("Writes cannot fail");
3564 (upd.serialized_length() as u16 + 2).write(&mut enc).expect("Writes cannot fail");
3565 msgs::ChannelUpdate::TYPE.write(&mut enc).expect("Writes cannot fail");
3566 upd.write(&mut enc).expect("Writes cannot fail");
3567 (desired_err_code, enc.0)
3569 // If we fail to get a unicast channel_update, it implies we don't yet have an SCID,
3570 // which means we really shouldn't have gotten a payment to be forwarded over this
3571 // channel yet, or if we did it's from a route hint. Either way, returning an error of
3572 // PERM|no_such_channel should be fine.
3573 (0x4000|10, Vec::new())
3577 // Fail a list of HTLCs that were just freed from the holding cell. The HTLCs need to be
3578 // failed backwards or, if they were one of our outgoing HTLCs, then their failure needs to
3579 // be surfaced to the user.
3580 fn fail_holding_cell_htlcs(&self, mut htlcs_to_fail: Vec<(HTLCSource, PaymentHash)>, channel_id: [u8; 32]) {
3581 for (htlc_src, payment_hash) in htlcs_to_fail.drain(..) {
3583 HTLCSource::PreviousHopData(HTLCPreviousHopData { .. }) => {
3584 let (failure_code, onion_failure_data) =
3585 match self.channel_state.lock().unwrap().by_id.entry(channel_id) {
3586 hash_map::Entry::Occupied(chan_entry) => {
3587 self.get_htlc_inbound_temp_fail_err_and_data(0x1000|7, &chan_entry.get())
3589 hash_map::Entry::Vacant(_) => (0x4000|10, Vec::new())
3591 let channel_state = self.channel_state.lock().unwrap();
3592 self.fail_htlc_backwards_internal(channel_state,
3593 htlc_src, &payment_hash, HTLCFailReason::Reason { failure_code, data: onion_failure_data});
3595 HTLCSource::OutboundRoute { session_priv, payment_id, path, payment_params, .. } => {
3596 let mut session_priv_bytes = [0; 32];
3597 session_priv_bytes.copy_from_slice(&session_priv[..]);
3598 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
3599 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
3600 if payment.get_mut().remove(&session_priv_bytes, Some(&path)) && !payment.get().is_fulfilled() {
3601 let retry = if let Some(payment_params_data) = payment_params {
3602 let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
3603 Some(RouteParameters {
3604 payment_params: payment_params_data,
3605 final_value_msat: path_last_hop.fee_msat,
3606 final_cltv_expiry_delta: path_last_hop.cltv_expiry_delta,
3609 let mut pending_events = self.pending_events.lock().unwrap();
3610 pending_events.push(events::Event::PaymentPathFailed {
3611 payment_id: Some(payment_id),
3613 rejected_by_dest: false,
3614 network_update: None,
3615 all_paths_failed: payment.get().remaining_parts() == 0,
3617 short_channel_id: None,
3624 if payment.get().abandoned() && payment.get().remaining_parts() == 0 {
3625 pending_events.push(events::Event::PaymentFailed {
3627 payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"),
3633 log_trace!(self.logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0));
3640 /// Fails an HTLC backwards to the sender of it to us.
3641 /// Note that while we take a channel_state lock as input, we do *not* assume consistency here.
3642 /// There are several callsites that do stupid things like loop over a list of payment_hashes
3643 /// to fail and take the channel_state lock for each iteration (as we take ownership and may
3644 /// drop it). In other words, no assumptions are made that entries in claimable_htlcs point to
3645 /// still-available channels.
3646 fn fail_htlc_backwards_internal(&self, mut channel_state_lock: MutexGuard<ChannelHolder<Signer>>, source: HTLCSource, payment_hash: &PaymentHash, onion_error: HTLCFailReason) {
3647 //TODO: There is a timing attack here where if a node fails an HTLC back to us they can
3648 //identify whether we sent it or not based on the (I presume) very different runtime
3649 //between the branches here. We should make this async and move it into the forward HTLCs
3652 // Note that we MUST NOT end up calling methods on self.chain_monitor here - we're called
3653 // from block_connected which may run during initialization prior to the chain_monitor
3654 // being fully configured. See the docs for `ChannelManagerReadArgs` for more.
3656 HTLCSource::OutboundRoute { ref path, session_priv, payment_id, ref payment_params, .. } => {
3657 let mut session_priv_bytes = [0; 32];
3658 session_priv_bytes.copy_from_slice(&session_priv[..]);
3659 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
3660 let mut all_paths_failed = false;
3661 let mut full_failure_ev = None;
3662 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
3663 if !payment.get_mut().remove(&session_priv_bytes, Some(&path)) {
3664 log_trace!(self.logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0));
3667 if payment.get().is_fulfilled() {
3668 log_trace!(self.logger, "Received failure of HTLC with payment_hash {} after payment completion", log_bytes!(payment_hash.0));
3671 if payment.get().remaining_parts() == 0 {
3672 all_paths_failed = true;
3673 if payment.get().abandoned() {
3674 full_failure_ev = Some(events::Event::PaymentFailed {
3676 payment_hash: payment.get().payment_hash().expect("PendingOutboundPayments::RetriesExceeded always has a payment hash set"),
3682 log_trace!(self.logger, "Received duplicative fail for HTLC with payment_hash {}", log_bytes!(payment_hash.0));
3685 mem::drop(channel_state_lock);
3686 let retry = if let Some(payment_params_data) = payment_params {
3687 let path_last_hop = path.last().expect("Outbound payments must have had a valid path");
3688 Some(RouteParameters {
3689 payment_params: payment_params_data.clone(),
3690 final_value_msat: path_last_hop.fee_msat,
3691 final_cltv_expiry_delta: path_last_hop.cltv_expiry_delta,
3694 log_trace!(self.logger, "Failing outbound payment HTLC with payment_hash {}", log_bytes!(payment_hash.0));
3696 let path_failure = match &onion_error {
3697 &HTLCFailReason::LightningError { ref err } => {
3699 let (network_update, short_channel_id, payment_retryable, onion_error_code, onion_error_data) = onion_utils::process_onion_failure(&self.secp_ctx, &self.logger, &source, err.data.clone());
3701 let (network_update, short_channel_id, payment_retryable, _, _) = onion_utils::process_onion_failure(&self.secp_ctx, &self.logger, &source, err.data.clone());
3702 // TODO: If we decided to blame ourselves (or one of our channels) in
3703 // process_onion_failure we should close that channel as it implies our
3704 // next-hop is needlessly blaming us!
3705 events::Event::PaymentPathFailed {
3706 payment_id: Some(payment_id),
3707 payment_hash: payment_hash.clone(),
3708 rejected_by_dest: !payment_retryable,
3715 error_code: onion_error_code,
3717 error_data: onion_error_data
3720 &HTLCFailReason::Reason {
3726 // we get a fail_malformed_htlc from the first hop
3727 // TODO: We'd like to generate a NetworkUpdate for temporary
3728 // failures here, but that would be insufficient as get_route
3729 // generally ignores its view of our own channels as we provide them via
3731 // TODO: For non-temporary failures, we really should be closing the
3732 // channel here as we apparently can't relay through them anyway.
3733 events::Event::PaymentPathFailed {
3734 payment_id: Some(payment_id),
3735 payment_hash: payment_hash.clone(),
3736 rejected_by_dest: path.len() == 1,
3737 network_update: None,
3740 short_channel_id: Some(path.first().unwrap().short_channel_id),
3743 error_code: Some(*failure_code),
3745 error_data: Some(data.clone()),
3749 let mut pending_events = self.pending_events.lock().unwrap();
3750 pending_events.push(path_failure);
3751 if let Some(ev) = full_failure_ev { pending_events.push(ev); }
3753 HTLCSource::PreviousHopData(HTLCPreviousHopData { short_channel_id, htlc_id, incoming_packet_shared_secret, phantom_shared_secret, .. }) => {
3754 let err_packet = match onion_error {
3755 HTLCFailReason::Reason { failure_code, data } => {
3756 log_trace!(self.logger, "Failing HTLC with payment_hash {} backwards from us with code {}", log_bytes!(payment_hash.0), failure_code);
3757 if let Some(phantom_ss) = phantom_shared_secret {
3758 let phantom_packet = onion_utils::build_failure_packet(&phantom_ss, failure_code, &data[..]).encode();
3759 let encrypted_phantom_packet = onion_utils::encrypt_failure_packet(&phantom_ss, &phantom_packet);
3760 onion_utils::encrypt_failure_packet(&incoming_packet_shared_secret, &encrypted_phantom_packet.data[..])
3762 let packet = onion_utils::build_failure_packet(&incoming_packet_shared_secret, failure_code, &data[..]).encode();
3763 onion_utils::encrypt_failure_packet(&incoming_packet_shared_secret, &packet)
3766 HTLCFailReason::LightningError { err } => {
3767 log_trace!(self.logger, "Failing HTLC with payment_hash {} backwards with pre-built LightningError", log_bytes!(payment_hash.0));
3768 onion_utils::encrypt_failure_packet(&incoming_packet_shared_secret, &err.data)
3772 let mut forward_event = None;
3773 if channel_state_lock.forward_htlcs.is_empty() {
3774 forward_event = Some(Duration::from_millis(MIN_HTLC_RELAY_HOLDING_CELL_MILLIS));
3776 match channel_state_lock.forward_htlcs.entry(short_channel_id) {
3777 hash_map::Entry::Occupied(mut entry) => {
3778 entry.get_mut().push(HTLCForwardInfo::FailHTLC { htlc_id, err_packet });
3780 hash_map::Entry::Vacant(entry) => {
3781 entry.insert(vec!(HTLCForwardInfo::FailHTLC { htlc_id, err_packet }));
3784 mem::drop(channel_state_lock);
3785 if let Some(time) = forward_event {
3786 let mut pending_events = self.pending_events.lock().unwrap();
3787 pending_events.push(events::Event::PendingHTLCsForwardable {
3788 time_forwardable: time
3795 /// Provides a payment preimage in response to [`Event::PaymentReceived`], generating any
3796 /// [`MessageSendEvent`]s needed to claim the payment.
3798 /// Note that if you did not set an `amount_msat` when calling [`create_inbound_payment`] or
3799 /// [`create_inbound_payment_for_hash`] you must check that the amount in the `PaymentReceived`
3800 /// event matches your expectation. If you fail to do so and call this method, you may provide
3801 /// the sender "proof-of-payment" when they did not fulfill the full expected payment.
3803 /// Returns whether any HTLCs were claimed, and thus if any new [`MessageSendEvent`]s are now
3804 /// pending for processing via [`get_and_clear_pending_msg_events`].
3806 /// [`Event::PaymentReceived`]: crate::util::events::Event::PaymentReceived
3807 /// [`create_inbound_payment`]: Self::create_inbound_payment
3808 /// [`create_inbound_payment_for_hash`]: Self::create_inbound_payment_for_hash
3809 /// [`get_and_clear_pending_msg_events`]: MessageSendEventsProvider::get_and_clear_pending_msg_events
3810 pub fn claim_funds(&self, payment_preimage: PaymentPreimage) -> bool {
3811 let payment_hash = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
3813 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
3815 let mut channel_state = Some(self.channel_state.lock().unwrap());
3816 let removed_source = channel_state.as_mut().unwrap().claimable_htlcs.remove(&payment_hash);
3817 if let Some(mut sources) = removed_source {
3818 assert!(!sources.is_empty());
3820 // If we are claiming an MPP payment, we have to take special care to ensure that each
3821 // channel exists before claiming all of the payments (inside one lock).
3822 // Note that channel existance is sufficient as we should always get a monitor update
3823 // which will take care of the real HTLC claim enforcement.
3825 // If we find an HTLC which we would need to claim but for which we do not have a
3826 // channel, we will fail all parts of the MPP payment. While we could wait and see if
3827 // the sender retries the already-failed path(s), it should be a pretty rare case where
3828 // we got all the HTLCs and then a channel closed while we were waiting for the user to
3829 // provide the preimage, so worrying too much about the optimal handling isn't worth
3831 let mut valid_mpp = true;
3832 for htlc in sources.iter() {
3833 if let None = channel_state.as_ref().unwrap().short_to_id.get(&htlc.prev_hop.short_channel_id) {
3839 let mut errs = Vec::new();
3840 let mut claimed_any_htlcs = false;
3841 for htlc in sources.drain(..) {
3843 if channel_state.is_none() { channel_state = Some(self.channel_state.lock().unwrap()); }
3844 let mut htlc_msat_height_data = byte_utils::be64_to_array(htlc.value).to_vec();
3845 htlc_msat_height_data.extend_from_slice(&byte_utils::be32_to_array(
3846 self.best_block.read().unwrap().height()));
3847 self.fail_htlc_backwards_internal(channel_state.take().unwrap(),
3848 HTLCSource::PreviousHopData(htlc.prev_hop), &payment_hash,
3849 HTLCFailReason::Reason { failure_code: 0x4000|15, data: htlc_msat_height_data });
3851 match self.claim_funds_from_hop(channel_state.as_mut().unwrap(), htlc.prev_hop, payment_preimage) {
3852 ClaimFundsFromHop::MonitorUpdateFail(pk, err, _) => {
3853 if let msgs::ErrorAction::IgnoreError = err.err.action {
3854 // We got a temporary failure updating monitor, but will claim the
3855 // HTLC when the monitor updating is restored (or on chain).
3856 log_error!(self.logger, "Temporary failure claiming HTLC, treating as success: {}", err.err.err);
3857 claimed_any_htlcs = true;
3858 } else { errs.push((pk, err)); }
3860 ClaimFundsFromHop::PrevHopForceClosed => unreachable!("We already checked for channel existence, we can't fail here!"),
3861 ClaimFundsFromHop::DuplicateClaim => {
3862 // While we should never get here in most cases, if we do, it likely
3863 // indicates that the HTLC was timed out some time ago and is no longer
3864 // available to be claimed. Thus, it does not make sense to set
3865 // `claimed_any_htlcs`.
3867 ClaimFundsFromHop::Success(_) => claimed_any_htlcs = true,
3872 // Now that we've done the entire above loop in one lock, we can handle any errors
3873 // which were generated.
3874 channel_state.take();
3876 for (counterparty_node_id, err) in errs.drain(..) {
3877 let res: Result<(), _> = Err(err);
3878 let _ = handle_error!(self, res, counterparty_node_id);
3885 fn claim_funds_from_hop(&self, channel_state_lock: &mut MutexGuard<ChannelHolder<Signer>>, prev_hop: HTLCPreviousHopData, payment_preimage: PaymentPreimage) -> ClaimFundsFromHop {
3886 //TODO: Delay the claimed_funds relaying just like we do outbound relay!
3887 let channel_state = &mut **channel_state_lock;
3888 let chan_id = match channel_state.short_to_id.get(&prev_hop.short_channel_id) {
3889 Some(chan_id) => chan_id.clone(),
3891 return ClaimFundsFromHop::PrevHopForceClosed
3895 if let hash_map::Entry::Occupied(mut chan) = channel_state.by_id.entry(chan_id) {
3896 match chan.get_mut().get_update_fulfill_htlc_and_commit(prev_hop.htlc_id, payment_preimage, &self.logger) {
3897 Ok(msgs_monitor_option) => {
3898 if let UpdateFulfillCommitFetch::NewClaim { msgs, htlc_value_msat, monitor_update } = msgs_monitor_option {
3899 if let Err(e) = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
3900 log_given_level!(self.logger, if e == ChannelMonitorUpdateErr::PermanentFailure { Level::Error } else { Level::Debug },
3901 "Failed to update channel monitor with preimage {:?}: {:?}",
3902 payment_preimage, e);
3903 return ClaimFundsFromHop::MonitorUpdateFail(
3904 chan.get().get_counterparty_node_id(),
3905 handle_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::CommitmentFirst, false, msgs.is_some()).unwrap_err(),
3906 Some(htlc_value_msat)
3909 if let Some((msg, commitment_signed)) = msgs {
3910 log_debug!(self.logger, "Claiming funds for HTLC with preimage {} resulted in a commitment_signed for channel {}",
3911 log_bytes!(payment_preimage.0), log_bytes!(chan.get().channel_id()));
3912 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
3913 node_id: chan.get().get_counterparty_node_id(),
3914 updates: msgs::CommitmentUpdate {
3915 update_add_htlcs: Vec::new(),
3916 update_fulfill_htlcs: vec![msg],
3917 update_fail_htlcs: Vec::new(),
3918 update_fail_malformed_htlcs: Vec::new(),
3924 return ClaimFundsFromHop::Success(htlc_value_msat);
3926 return ClaimFundsFromHop::DuplicateClaim;
3929 Err((e, monitor_update)) => {
3930 if let Err(e) = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
3931 log_given_level!(self.logger, if e == ChannelMonitorUpdateErr::PermanentFailure { Level::Error } else { Level::Info },
3932 "Failed to update channel monitor with preimage {:?} immediately prior to force-close: {:?}",
3933 payment_preimage, e);
3935 let counterparty_node_id = chan.get().get_counterparty_node_id();
3936 let (drop, res) = convert_chan_err!(self, e, channel_state.short_to_id, chan.get_mut(), &chan_id);
3938 chan.remove_entry();
3940 return ClaimFundsFromHop::MonitorUpdateFail(counterparty_node_id, res, None);
3943 } else { unreachable!(); }
3946 fn finalize_claims(&self, mut sources: Vec<HTLCSource>) {
3947 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
3948 let mut pending_events = self.pending_events.lock().unwrap();
3949 for source in sources.drain(..) {
3950 if let HTLCSource::OutboundRoute { session_priv, payment_id, path, .. } = source {
3951 let mut session_priv_bytes = [0; 32];
3952 session_priv_bytes.copy_from_slice(&session_priv[..]);
3953 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
3954 assert!(payment.get().is_fulfilled());
3955 if payment.get_mut().remove(&session_priv_bytes, None) {
3956 pending_events.push(
3957 events::Event::PaymentPathSuccessful {
3959 payment_hash: payment.get().payment_hash(),
3964 if payment.get().remaining_parts() == 0 {
3972 fn claim_funds_internal(&self, mut channel_state_lock: MutexGuard<ChannelHolder<Signer>>, source: HTLCSource, payment_preimage: PaymentPreimage, forwarded_htlc_value_msat: Option<u64>, from_onchain: bool, next_channel_id: [u8; 32]) {
3974 HTLCSource::OutboundRoute { session_priv, payment_id, path, .. } => {
3975 mem::drop(channel_state_lock);
3976 let mut session_priv_bytes = [0; 32];
3977 session_priv_bytes.copy_from_slice(&session_priv[..]);
3978 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
3979 if let hash_map::Entry::Occupied(mut payment) = outbounds.entry(payment_id) {
3980 let mut pending_events = self.pending_events.lock().unwrap();
3981 if !payment.get().is_fulfilled() {
3982 let payment_hash = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
3983 let fee_paid_msat = payment.get().get_pending_fee_msat();
3984 pending_events.push(
3985 events::Event::PaymentSent {
3986 payment_id: Some(payment_id),
3992 payment.get_mut().mark_fulfilled();
3996 // We currently immediately remove HTLCs which were fulfilled on-chain.
3997 // This could potentially lead to removing a pending payment too early,
3998 // with a reorg of one block causing us to re-add the fulfilled payment on
4000 // TODO: We should have a second monitor event that informs us of payments
4001 // irrevocably fulfilled.
4002 if payment.get_mut().remove(&session_priv_bytes, Some(&path)) {
4003 let payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0).into_inner()));
4004 pending_events.push(
4005 events::Event::PaymentPathSuccessful {
4013 if payment.get().remaining_parts() == 0 {
4018 log_trace!(self.logger, "Received duplicative fulfill for HTLC with payment_preimage {}", log_bytes!(payment_preimage.0));
4021 HTLCSource::PreviousHopData(hop_data) => {
4022 let prev_outpoint = hop_data.outpoint;
4023 let res = self.claim_funds_from_hop(&mut channel_state_lock, hop_data, payment_preimage);
4024 let claimed_htlc = if let ClaimFundsFromHop::DuplicateClaim = res { false } else { true };
4025 let htlc_claim_value_msat = match res {
4026 ClaimFundsFromHop::MonitorUpdateFail(_, _, amt_opt) => amt_opt,
4027 ClaimFundsFromHop::Success(amt) => Some(amt),
4030 if let ClaimFundsFromHop::PrevHopForceClosed = res {
4031 let preimage_update = ChannelMonitorUpdate {
4032 update_id: CLOSED_CHANNEL_UPDATE_ID,
4033 updates: vec![ChannelMonitorUpdateStep::PaymentPreimage {
4034 payment_preimage: payment_preimage.clone(),
4037 // We update the ChannelMonitor on the backward link, after
4038 // receiving an offchain preimage event from the forward link (the
4039 // event being update_fulfill_htlc).
4040 if let Err(e) = self.chain_monitor.update_channel(prev_outpoint, preimage_update) {
4041 log_error!(self.logger, "Critical error: failed to update channel monitor with preimage {:?}: {:?}",
4042 payment_preimage, e);
4044 // Note that we do *not* set `claimed_htlc` to false here. In fact, this
4045 // totally could be a duplicate claim, but we have no way of knowing
4046 // without interrogating the `ChannelMonitor` we've provided the above
4047 // update to. Instead, we simply document in `PaymentForwarded` that this
4050 mem::drop(channel_state_lock);
4051 if let ClaimFundsFromHop::MonitorUpdateFail(pk, err, _) = res {
4052 let result: Result<(), _> = Err(err);
4053 let _ = handle_error!(self, result, pk);
4057 if let Some(forwarded_htlc_value) = forwarded_htlc_value_msat {
4058 let fee_earned_msat = if let Some(claimed_htlc_value) = htlc_claim_value_msat {
4059 Some(claimed_htlc_value - forwarded_htlc_value)
4062 let mut pending_events = self.pending_events.lock().unwrap();
4063 let prev_channel_id = Some(prev_outpoint.to_channel_id());
4064 let next_channel_id = Some(next_channel_id);
4066 pending_events.push(events::Event::PaymentForwarded {
4068 claim_from_onchain_tx: from_onchain,
4078 /// Gets the node_id held by this ChannelManager
4079 pub fn get_our_node_id(&self) -> PublicKey {
4080 self.our_network_pubkey.clone()
4083 fn channel_monitor_updated(&self, funding_txo: &OutPoint, highest_applied_update_id: u64) {
4084 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
4086 let chan_restoration_res;
4087 let (mut pending_failures, finalized_claims) = {
4088 let mut channel_lock = self.channel_state.lock().unwrap();
4089 let channel_state = &mut *channel_lock;
4090 let mut channel = match channel_state.by_id.entry(funding_txo.to_channel_id()) {
4091 hash_map::Entry::Occupied(chan) => chan,
4092 hash_map::Entry::Vacant(_) => return,
4094 if !channel.get().is_awaiting_monitor_update() || channel.get().get_latest_monitor_update_id() != highest_applied_update_id {
4098 let updates = channel.get_mut().monitor_updating_restored(&self.logger, self.get_our_node_id(), self.genesis_hash, self.best_block.read().unwrap().height());
4099 let channel_update = if updates.funding_locked.is_some() && channel.get().is_usable() {
4100 // We only send a channel_update in the case where we are just now sending a
4101 // funding_locked and the channel is in a usable state. We may re-send a
4102 // channel_update later through the announcement_signatures process for public
4103 // channels, but there's no reason not to just inform our counterparty of our fees
4105 if let Ok(msg) = self.get_channel_update_for_unicast(channel.get()) {
4106 Some(events::MessageSendEvent::SendChannelUpdate {
4107 node_id: channel.get().get_counterparty_node_id(),
4112 chan_restoration_res = handle_chan_restoration_locked!(self, channel_lock, channel_state, channel, updates.raa, updates.commitment_update, updates.order, None, updates.accepted_htlcs, updates.funding_broadcastable, updates.funding_locked, updates.announcement_sigs);
4113 if let Some(upd) = channel_update {
4114 channel_state.pending_msg_events.push(upd);
4116 (updates.failed_htlcs, updates.finalized_claimed_htlcs)
4118 post_handle_chan_restoration!(self, chan_restoration_res);
4119 self.finalize_claims(finalized_claims);
4120 for failure in pending_failures.drain(..) {
4121 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), failure.0, &failure.1, failure.2);
4125 /// Accepts a request to open a channel after a [`Event::OpenChannelRequest`].
4127 /// The `temporary_channel_id` parameter indicates which inbound channel should be accepted,
4128 /// and the `counterparty_node_id` parameter is the id of the peer which has requested to open
4131 /// The `user_channel_id` parameter will be provided back in
4132 /// [`Event::ChannelClosed::user_channel_id`] to allow tracking of which events correspond
4133 /// with which `accept_inbound_channel`/`accept_inbound_channel_from_trusted_peer_0conf` call.
4135 /// [`Event::OpenChannelRequest`]: events::Event::OpenChannelRequest
4136 /// [`Event::ChannelClosed::user_channel_id`]: events::Event::ChannelClosed::user_channel_id
4137 pub fn accept_inbound_channel(&self, temporary_channel_id: &[u8; 32], counterparty_node_id: &PublicKey, user_channel_id: u64) -> Result<(), APIError> {
4138 self.do_accept_inbound_channel(temporary_channel_id, counterparty_node_id, false, user_channel_id)
4141 /// Accepts a request to open a channel after a [`events::Event::OpenChannelRequest`], treating
4142 /// it as confirmed immediately.
4144 /// The `user_channel_id` parameter will be provided back in
4145 /// [`Event::ChannelClosed::user_channel_id`] to allow tracking of which events correspond
4146 /// with which `accept_inbound_channel`/`accept_inbound_channel_from_trusted_peer_0conf` call.
4148 /// Unlike [`ChannelManager::accept_inbound_channel`], this method accepts the incoming channel
4149 /// and (if the counterparty agrees), enables forwarding of payments immediately.
4151 /// This fully trusts that the counterparty has honestly and correctly constructed the funding
4152 /// transaction and blindly assumes that it will eventually confirm.
4154 /// If it does not confirm before we decide to close the channel, or if the funding transaction
4155 /// does not pay to the correct script the correct amount, *you will lose funds*.
4157 /// [`Event::OpenChannelRequest`]: events::Event::OpenChannelRequest
4158 /// [`Event::ChannelClosed::user_channel_id`]: events::Event::ChannelClosed::user_channel_id
4159 pub fn accept_inbound_channel_from_trusted_peer_0conf(&self, temporary_channel_id: &[u8; 32], counterparty_node_id: &PublicKey, user_channel_id: u64) -> Result<(), APIError> {
4160 self.do_accept_inbound_channel(temporary_channel_id, counterparty_node_id, true, user_channel_id)
4163 fn do_accept_inbound_channel(&self, temporary_channel_id: &[u8; 32], counterparty_node_id: &PublicKey, accept_0conf: bool, user_channel_id: u64) -> Result<(), APIError> {
4164 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
4166 let mut channel_state_lock = self.channel_state.lock().unwrap();
4167 let channel_state = &mut *channel_state_lock;
4168 match channel_state.by_id.entry(temporary_channel_id.clone()) {
4169 hash_map::Entry::Occupied(mut channel) => {
4170 if !channel.get().inbound_is_awaiting_accept() {
4171 return Err(APIError::APIMisuseError { err: "The channel isn't currently awaiting to be accepted.".to_owned() });
4173 if *counterparty_node_id != channel.get().get_counterparty_node_id() {
4174 return Err(APIError::APIMisuseError { err: "The passed counterparty_node_id doesn't match the channel's counterparty node_id".to_owned() });
4176 if accept_0conf { channel.get_mut().set_0conf(); }
4177 channel_state.pending_msg_events.push(events::MessageSendEvent::SendAcceptChannel {
4178 node_id: channel.get().get_counterparty_node_id(),
4179 msg: channel.get_mut().accept_inbound_channel(user_channel_id),
4182 hash_map::Entry::Vacant(_) => {
4183 return Err(APIError::ChannelUnavailable { err: "Can't accept a channel that doesn't exist".to_owned() });
4189 fn internal_open_channel(&self, counterparty_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::OpenChannel) -> Result<(), MsgHandleErrInternal> {
4190 if msg.chain_hash != self.genesis_hash {
4191 return Err(MsgHandleErrInternal::send_err_msg_no_close("Unknown genesis block hash".to_owned(), msg.temporary_channel_id.clone()));
4194 if !self.default_configuration.accept_inbound_channels {
4195 return Err(MsgHandleErrInternal::send_err_msg_no_close("No inbound channels accepted".to_owned(), msg.temporary_channel_id.clone()));
4198 let outbound_scid_alias = self.create_and_insert_outbound_scid_alias();
4199 let mut channel = match Channel::new_from_req(&self.fee_estimator, &self.keys_manager,
4200 counterparty_node_id.clone(), &their_features, msg, 0, &self.default_configuration,
4201 self.best_block.read().unwrap().height(), &self.logger, outbound_scid_alias)
4204 self.outbound_scid_aliases.lock().unwrap().remove(&outbound_scid_alias);
4205 return Err(MsgHandleErrInternal::from_chan_no_close(e, msg.temporary_channel_id));
4209 let mut channel_state_lock = self.channel_state.lock().unwrap();
4210 let channel_state = &mut *channel_state_lock;
4211 match channel_state.by_id.entry(channel.channel_id()) {
4212 hash_map::Entry::Occupied(_) => {
4213 self.outbound_scid_aliases.lock().unwrap().remove(&outbound_scid_alias);
4214 return Err(MsgHandleErrInternal::send_err_msg_no_close("temporary_channel_id collision!".to_owned(), msg.temporary_channel_id.clone()))
4216 hash_map::Entry::Vacant(entry) => {
4217 if !self.default_configuration.manually_accept_inbound_channels {
4218 channel_state.pending_msg_events.push(events::MessageSendEvent::SendAcceptChannel {
4219 node_id: counterparty_node_id.clone(),
4220 msg: channel.accept_inbound_channel(0),
4223 let mut pending_events = self.pending_events.lock().unwrap();
4224 pending_events.push(
4225 events::Event::OpenChannelRequest {
4226 temporary_channel_id: msg.temporary_channel_id.clone(),
4227 counterparty_node_id: counterparty_node_id.clone(),
4228 funding_satoshis: msg.funding_satoshis,
4229 push_msat: msg.push_msat,
4230 channel_type: channel.get_channel_type().clone(),
4235 entry.insert(channel);
4241 fn internal_accept_channel(&self, counterparty_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::AcceptChannel) -> Result<(), MsgHandleErrInternal> {
4242 let (value, output_script, user_id) = {
4243 let mut channel_lock = self.channel_state.lock().unwrap();
4244 let channel_state = &mut *channel_lock;
4245 match channel_state.by_id.entry(msg.temporary_channel_id) {
4246 hash_map::Entry::Occupied(mut chan) => {
4247 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4248 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.temporary_channel_id));
4250 try_chan_entry!(self, chan.get_mut().accept_channel(&msg, &self.default_configuration.peer_channel_config_limits, &their_features), channel_state, chan);
4251 (chan.get().get_value_satoshis(), chan.get().get_funding_redeemscript().to_v0_p2wsh(), chan.get().get_user_id())
4253 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.temporary_channel_id))
4256 let mut pending_events = self.pending_events.lock().unwrap();
4257 pending_events.push(events::Event::FundingGenerationReady {
4258 temporary_channel_id: msg.temporary_channel_id,
4259 counterparty_node_id: *counterparty_node_id,
4260 channel_value_satoshis: value,
4262 user_channel_id: user_id,
4267 fn internal_funding_created(&self, counterparty_node_id: &PublicKey, msg: &msgs::FundingCreated) -> Result<(), MsgHandleErrInternal> {
4268 let ((funding_msg, monitor, mut funding_locked), mut chan) = {
4269 let best_block = *self.best_block.read().unwrap();
4270 let mut channel_lock = self.channel_state.lock().unwrap();
4271 let channel_state = &mut *channel_lock;
4272 match channel_state.by_id.entry(msg.temporary_channel_id.clone()) {
4273 hash_map::Entry::Occupied(mut chan) => {
4274 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4275 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.temporary_channel_id));
4277 (try_chan_entry!(self, chan.get_mut().funding_created(msg, best_block, &self.logger), channel_state, chan), chan.remove())
4279 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.temporary_channel_id))
4282 // Because we have exclusive ownership of the channel here we can release the channel_state
4283 // lock before watch_channel
4284 if let Err(e) = self.chain_monitor.watch_channel(monitor.get_funding_txo().0, monitor) {
4286 ChannelMonitorUpdateErr::PermanentFailure => {
4287 // Note that we reply with the new channel_id in error messages if we gave up on the
4288 // channel, not the temporary_channel_id. This is compatible with ourselves, but the
4289 // spec is somewhat ambiguous here. Not a huge deal since we'll send error messages for
4290 // any messages referencing a previously-closed channel anyway.
4291 // We do not do a force-close here as that would generate a monitor update for
4292 // a monitor that we didn't manage to store (and that we don't care about - we
4293 // don't respond with the funding_signed so the channel can never go on chain).
4294 let (_monitor_update, failed_htlcs) = chan.force_shutdown(true);
4295 assert!(failed_htlcs.is_empty());
4296 return Err(MsgHandleErrInternal::send_err_msg_no_close("ChannelMonitor storage failure".to_owned(), funding_msg.channel_id));
4298 ChannelMonitorUpdateErr::TemporaryFailure => {
4299 // There's no problem signing a counterparty's funding transaction if our monitor
4300 // hasn't persisted to disk yet - we can't lose money on a transaction that we haven't
4301 // accepted payment from yet. We do, however, need to wait to send our funding_locked
4302 // until we have persisted our monitor.
4303 chan.monitor_update_failed(false, false, funding_locked.is_some(), Vec::new(), Vec::new(), Vec::new());
4304 funding_locked = None; // Don't send the funding_locked now
4308 let mut channel_state_lock = self.channel_state.lock().unwrap();
4309 let channel_state = &mut *channel_state_lock;
4310 match channel_state.by_id.entry(funding_msg.channel_id) {
4311 hash_map::Entry::Occupied(_) => {
4312 return Err(MsgHandleErrInternal::send_err_msg_no_close("Already had channel with the new channel_id".to_owned(), funding_msg.channel_id))
4314 hash_map::Entry::Vacant(e) => {
4315 channel_state.pending_msg_events.push(events::MessageSendEvent::SendFundingSigned {
4316 node_id: counterparty_node_id.clone(),
4319 if let Some(msg) = funding_locked {
4320 send_funding_locked!(channel_state.short_to_id, channel_state.pending_msg_events, chan, msg);
4328 fn internal_funding_signed(&self, counterparty_node_id: &PublicKey, msg: &msgs::FundingSigned) -> Result<(), MsgHandleErrInternal> {
4330 let best_block = *self.best_block.read().unwrap();
4331 let mut channel_lock = self.channel_state.lock().unwrap();
4332 let channel_state = &mut *channel_lock;
4333 match channel_state.by_id.entry(msg.channel_id) {
4334 hash_map::Entry::Occupied(mut chan) => {
4335 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4336 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4338 let (monitor, funding_tx, funding_locked) = match chan.get_mut().funding_signed(&msg, best_block, &self.logger) {
4339 Ok(update) => update,
4340 Err(e) => try_chan_entry!(self, Err(e), channel_state, chan),
4342 if let Err(e) = self.chain_monitor.watch_channel(chan.get().get_funding_txo().unwrap(), monitor) {
4343 let mut res = handle_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::RevokeAndACKFirst, funding_locked.is_some(), OPTIONALLY_RESEND_FUNDING_LOCKED);
4344 if let Err(MsgHandleErrInternal { ref mut shutdown_finish, .. }) = res {
4345 // We weren't able to watch the channel to begin with, so no updates should be made on
4346 // it. Previously, full_stack_target found an (unreachable) panic when the
4347 // monitor update contained within `shutdown_finish` was applied.
4348 if let Some((ref mut shutdown_finish, _)) = shutdown_finish {
4349 shutdown_finish.0.take();
4354 if let Some(msg) = funding_locked {
4355 send_funding_locked!(channel_state.short_to_id, channel_state.pending_msg_events, chan.get(), msg);
4359 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4362 log_info!(self.logger, "Broadcasting funding transaction with txid {}", funding_tx.txid());
4363 self.tx_broadcaster.broadcast_transaction(&funding_tx);
4367 fn internal_funding_locked(&self, counterparty_node_id: &PublicKey, msg: &msgs::FundingLocked) -> Result<(), MsgHandleErrInternal> {
4368 let mut channel_state_lock = self.channel_state.lock().unwrap();
4369 let channel_state = &mut *channel_state_lock;
4370 match channel_state.by_id.entry(msg.channel_id) {
4371 hash_map::Entry::Occupied(mut chan) => {
4372 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4373 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4375 let announcement_sigs_opt = try_chan_entry!(self, chan.get_mut().funding_locked(&msg, self.get_our_node_id(),
4376 self.genesis_hash.clone(), &self.best_block.read().unwrap(), &self.logger), channel_state, chan);
4377 if let Some(announcement_sigs) = announcement_sigs_opt {
4378 log_trace!(self.logger, "Sending announcement_signatures for channel {}", log_bytes!(chan.get().channel_id()));
4379 channel_state.pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
4380 node_id: counterparty_node_id.clone(),
4381 msg: announcement_sigs,
4383 } else if chan.get().is_usable() {
4384 // If we're sending an announcement_signatures, we'll send the (public)
4385 // channel_update after sending a channel_announcement when we receive our
4386 // counterparty's announcement_signatures. Thus, we only bother to send a
4387 // channel_update here if the channel is not public, i.e. we're not sending an
4388 // announcement_signatures.
4389 log_trace!(self.logger, "Sending private initial channel_update for our counterparty on channel {}", log_bytes!(chan.get().channel_id()));
4390 if let Ok(msg) = self.get_channel_update_for_unicast(chan.get()) {
4391 channel_state.pending_msg_events.push(events::MessageSendEvent::SendChannelUpdate {
4392 node_id: counterparty_node_id.clone(),
4399 hash_map::Entry::Vacant(_) => Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4403 fn internal_shutdown(&self, counterparty_node_id: &PublicKey, their_features: &InitFeatures, msg: &msgs::Shutdown) -> Result<(), MsgHandleErrInternal> {
4404 let mut dropped_htlcs: Vec<(HTLCSource, PaymentHash)>;
4405 let result: Result<(), _> = loop {
4406 let mut channel_state_lock = self.channel_state.lock().unwrap();
4407 let channel_state = &mut *channel_state_lock;
4409 match channel_state.by_id.entry(msg.channel_id.clone()) {
4410 hash_map::Entry::Occupied(mut chan_entry) => {
4411 if chan_entry.get().get_counterparty_node_id() != *counterparty_node_id {
4412 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4415 if !chan_entry.get().received_shutdown() {
4416 log_info!(self.logger, "Received a shutdown message from our counterparty for channel {}{}.",
4417 log_bytes!(msg.channel_id),
4418 if chan_entry.get().sent_shutdown() { " after we initiated shutdown" } else { "" });
4421 let (shutdown, monitor_update, htlcs) = try_chan_entry!(self, chan_entry.get_mut().shutdown(&self.keys_manager, &their_features, &msg), channel_state, chan_entry);
4422 dropped_htlcs = htlcs;
4424 // Update the monitor with the shutdown script if necessary.
4425 if let Some(monitor_update) = monitor_update {
4426 if let Err(e) = self.chain_monitor.update_channel(chan_entry.get().get_funding_txo().unwrap(), monitor_update) {
4427 let (result, is_permanent) =
4428 handle_monitor_err!(self, e, channel_state.short_to_id, chan_entry.get_mut(), RAACommitmentOrder::CommitmentFirst, chan_entry.key(), NO_UPDATE);
4430 remove_channel!(self, channel_state, chan_entry);
4436 if let Some(msg) = shutdown {
4437 channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
4438 node_id: *counterparty_node_id,
4445 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4448 for htlc_source in dropped_htlcs.drain(..) {
4449 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() });
4452 let _ = handle_error!(self, result, *counterparty_node_id);
4456 fn internal_closing_signed(&self, counterparty_node_id: &PublicKey, msg: &msgs::ClosingSigned) -> Result<(), MsgHandleErrInternal> {
4457 let (tx, chan_option) = {
4458 let mut channel_state_lock = self.channel_state.lock().unwrap();
4459 let channel_state = &mut *channel_state_lock;
4460 match channel_state.by_id.entry(msg.channel_id.clone()) {
4461 hash_map::Entry::Occupied(mut chan_entry) => {
4462 if chan_entry.get().get_counterparty_node_id() != *counterparty_node_id {
4463 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4465 let (closing_signed, tx) = try_chan_entry!(self, chan_entry.get_mut().closing_signed(&self.fee_estimator, &msg), channel_state, chan_entry);
4466 if let Some(msg) = closing_signed {
4467 channel_state.pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
4468 node_id: counterparty_node_id.clone(),
4473 // We're done with this channel, we've got a signed closing transaction and
4474 // will send the closing_signed back to the remote peer upon return. This
4475 // also implies there are no pending HTLCs left on the channel, so we can
4476 // fully delete it from tracking (the channel monitor is still around to
4477 // watch for old state broadcasts)!
4478 (tx, Some(remove_channel!(self, channel_state, chan_entry)))
4479 } else { (tx, None) }
4481 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4484 if let Some(broadcast_tx) = tx {
4485 log_info!(self.logger, "Broadcasting {}", log_tx!(broadcast_tx));
4486 self.tx_broadcaster.broadcast_transaction(&broadcast_tx);
4488 if let Some(chan) = chan_option {
4489 if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
4490 let mut channel_state = self.channel_state.lock().unwrap();
4491 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
4495 self.issue_channel_close_events(&chan, ClosureReason::CooperativeClosure);
4500 fn internal_update_add_htlc(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) -> Result<(), MsgHandleErrInternal> {
4501 //TODO: BOLT 4 points out a specific attack where a peer may re-send an onion packet and
4502 //determine the state of the payment based on our response/if we forward anything/the time
4503 //we take to respond. We should take care to avoid allowing such an attack.
4505 //TODO: There exists a further attack where a node may garble the onion data, forward it to
4506 //us repeatedly garbled in different ways, and compare our error messages, which are
4507 //encrypted with the same key. It's not immediately obvious how to usefully exploit that,
4508 //but we should prevent it anyway.
4510 let (pending_forward_info, mut channel_state_lock) = self.decode_update_add_htlc_onion(msg);
4511 let channel_state = &mut *channel_state_lock;
4513 match channel_state.by_id.entry(msg.channel_id) {
4514 hash_map::Entry::Occupied(mut chan) => {
4515 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4516 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4519 let create_pending_htlc_status = |chan: &Channel<Signer>, pending_forward_info: PendingHTLCStatus, error_code: u16| {
4520 // If the update_add is completely bogus, the call will Err and we will close,
4521 // but if we've sent a shutdown and they haven't acknowledged it yet, we just
4522 // want to reject the new HTLC and fail it backwards instead of forwarding.
4523 match pending_forward_info {
4524 PendingHTLCStatus::Forward(PendingHTLCInfo { ref incoming_shared_secret, .. }) => {
4525 let reason = if (error_code & 0x1000) != 0 {
4526 let (real_code, error_data) = self.get_htlc_inbound_temp_fail_err_and_data(error_code, chan);
4527 onion_utils::build_first_hop_failure_packet(incoming_shared_secret, real_code, &error_data)
4529 onion_utils::build_first_hop_failure_packet(incoming_shared_secret, error_code, &[])
4531 let msg = msgs::UpdateFailHTLC {
4532 channel_id: msg.channel_id,
4533 htlc_id: msg.htlc_id,
4536 PendingHTLCStatus::Fail(HTLCFailureMsg::Relay(msg))
4538 _ => pending_forward_info
4541 try_chan_entry!(self, chan.get_mut().update_add_htlc(&msg, pending_forward_info, create_pending_htlc_status, &self.logger), channel_state, chan);
4543 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4548 fn internal_update_fulfill_htlc(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) -> Result<(), MsgHandleErrInternal> {
4549 let mut channel_lock = self.channel_state.lock().unwrap();
4550 let (htlc_source, forwarded_htlc_value) = {
4551 let channel_state = &mut *channel_lock;
4552 match channel_state.by_id.entry(msg.channel_id) {
4553 hash_map::Entry::Occupied(mut chan) => {
4554 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4555 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4557 try_chan_entry!(self, chan.get_mut().update_fulfill_htlc(&msg), channel_state, chan)
4559 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4562 self.claim_funds_internal(channel_lock, htlc_source, msg.payment_preimage.clone(), Some(forwarded_htlc_value), false, msg.channel_id);
4566 fn internal_update_fail_htlc(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) -> Result<(), MsgHandleErrInternal> {
4567 let mut channel_lock = self.channel_state.lock().unwrap();
4568 let channel_state = &mut *channel_lock;
4569 match channel_state.by_id.entry(msg.channel_id) {
4570 hash_map::Entry::Occupied(mut chan) => {
4571 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4572 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4574 try_chan_entry!(self, chan.get_mut().update_fail_htlc(&msg, HTLCFailReason::LightningError { err: msg.reason.clone() }), channel_state, chan);
4576 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4581 fn internal_update_fail_malformed_htlc(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) -> Result<(), MsgHandleErrInternal> {
4582 let mut channel_lock = self.channel_state.lock().unwrap();
4583 let channel_state = &mut *channel_lock;
4584 match channel_state.by_id.entry(msg.channel_id) {
4585 hash_map::Entry::Occupied(mut chan) => {
4586 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4587 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4589 if (msg.failure_code & 0x8000) == 0 {
4590 let chan_err: ChannelError = ChannelError::Close("Got update_fail_malformed_htlc with BADONION not set".to_owned());
4591 try_chan_entry!(self, Err(chan_err), channel_state, chan);
4593 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);
4596 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4600 fn internal_commitment_signed(&self, counterparty_node_id: &PublicKey, msg: &msgs::CommitmentSigned) -> Result<(), MsgHandleErrInternal> {
4601 let mut channel_state_lock = self.channel_state.lock().unwrap();
4602 let channel_state = &mut *channel_state_lock;
4603 match channel_state.by_id.entry(msg.channel_id) {
4604 hash_map::Entry::Occupied(mut chan) => {
4605 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4606 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4608 let (revoke_and_ack, commitment_signed, monitor_update) =
4609 match chan.get_mut().commitment_signed(&msg, &self.logger) {
4610 Err((None, e)) => try_chan_entry!(self, Err(e), channel_state, chan),
4611 Err((Some(update), e)) => {
4612 assert!(chan.get().is_awaiting_monitor_update());
4613 let _ = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), update);
4614 try_chan_entry!(self, Err(e), channel_state, chan);
4619 if let Err(e) = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), monitor_update) {
4620 return_monitor_err!(self, e, channel_state, chan, RAACommitmentOrder::RevokeAndACKFirst, true, commitment_signed.is_some());
4622 channel_state.pending_msg_events.push(events::MessageSendEvent::SendRevokeAndACK {
4623 node_id: counterparty_node_id.clone(),
4624 msg: revoke_and_ack,
4626 if let Some(msg) = commitment_signed {
4627 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
4628 node_id: counterparty_node_id.clone(),
4629 updates: msgs::CommitmentUpdate {
4630 update_add_htlcs: Vec::new(),
4631 update_fulfill_htlcs: Vec::new(),
4632 update_fail_htlcs: Vec::new(),
4633 update_fail_malformed_htlcs: Vec::new(),
4635 commitment_signed: msg,
4641 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4646 fn forward_htlcs(&self, per_source_pending_forwards: &mut [(u64, OutPoint, Vec<(PendingHTLCInfo, u64)>)]) {
4647 for &mut (prev_short_channel_id, prev_funding_outpoint, ref mut pending_forwards) in per_source_pending_forwards {
4648 let mut forward_event = None;
4649 if !pending_forwards.is_empty() {
4650 let mut channel_state = self.channel_state.lock().unwrap();
4651 if channel_state.forward_htlcs.is_empty() {
4652 forward_event = Some(Duration::from_millis(MIN_HTLC_RELAY_HOLDING_CELL_MILLIS))
4654 for (forward_info, prev_htlc_id) in pending_forwards.drain(..) {
4655 match channel_state.forward_htlcs.entry(match forward_info.routing {
4656 PendingHTLCRouting::Forward { short_channel_id, .. } => short_channel_id,
4657 PendingHTLCRouting::Receive { .. } => 0,
4658 PendingHTLCRouting::ReceiveKeysend { .. } => 0,
4660 hash_map::Entry::Occupied(mut entry) => {
4661 entry.get_mut().push(HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_funding_outpoint,
4662 prev_htlc_id, forward_info });
4664 hash_map::Entry::Vacant(entry) => {
4665 entry.insert(vec!(HTLCForwardInfo::AddHTLC { prev_short_channel_id, prev_funding_outpoint,
4666 prev_htlc_id, forward_info }));
4671 match forward_event {
4673 let mut pending_events = self.pending_events.lock().unwrap();
4674 pending_events.push(events::Event::PendingHTLCsForwardable {
4675 time_forwardable: time
4683 fn internal_revoke_and_ack(&self, counterparty_node_id: &PublicKey, msg: &msgs::RevokeAndACK) -> Result<(), MsgHandleErrInternal> {
4684 let mut htlcs_to_fail = Vec::new();
4686 let mut channel_state_lock = self.channel_state.lock().unwrap();
4687 let channel_state = &mut *channel_state_lock;
4688 match channel_state.by_id.entry(msg.channel_id) {
4689 hash_map::Entry::Occupied(mut chan) => {
4690 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4691 break Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4693 let was_frozen_for_monitor = chan.get().is_awaiting_monitor_update();
4694 let raa_updates = break_chan_entry!(self,
4695 chan.get_mut().revoke_and_ack(&msg, &self.logger), channel_state, chan);
4696 htlcs_to_fail = raa_updates.holding_cell_failed_htlcs;
4697 if let Err(e) = self.chain_monitor.update_channel(chan.get().get_funding_txo().unwrap(), raa_updates.monitor_update) {
4698 if was_frozen_for_monitor {
4699 assert!(raa_updates.commitment_update.is_none());
4700 assert!(raa_updates.accepted_htlcs.is_empty());
4701 assert!(raa_updates.failed_htlcs.is_empty());
4702 assert!(raa_updates.finalized_claimed_htlcs.is_empty());
4703 break Err(MsgHandleErrInternal::ignore_no_close("Previous monitor update failure prevented responses to RAA".to_owned()));
4705 if let Err(e) = handle_monitor_err!(self, e, channel_state, chan,
4706 RAACommitmentOrder::CommitmentFirst, false,
4707 raa_updates.commitment_update.is_some(), false,
4708 raa_updates.accepted_htlcs, raa_updates.failed_htlcs,
4709 raa_updates.finalized_claimed_htlcs) {
4711 } else { unreachable!(); }
4714 if let Some(updates) = raa_updates.commitment_update {
4715 channel_state.pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
4716 node_id: counterparty_node_id.clone(),
4720 break Ok((raa_updates.accepted_htlcs, raa_updates.failed_htlcs,
4721 raa_updates.finalized_claimed_htlcs,
4722 chan.get().get_short_channel_id()
4723 .unwrap_or(chan.get().outbound_scid_alias()),
4724 chan.get().get_funding_txo().unwrap()))
4726 hash_map::Entry::Vacant(_) => break Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4729 self.fail_holding_cell_htlcs(htlcs_to_fail, msg.channel_id);
4731 Ok((pending_forwards, mut pending_failures, finalized_claim_htlcs,
4732 short_channel_id, channel_outpoint)) =>
4734 for failure in pending_failures.drain(..) {
4735 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), failure.0, &failure.1, failure.2);
4737 self.forward_htlcs(&mut [(short_channel_id, channel_outpoint, pending_forwards)]);
4738 self.finalize_claims(finalized_claim_htlcs);
4745 fn internal_update_fee(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFee) -> Result<(), MsgHandleErrInternal> {
4746 let mut channel_lock = self.channel_state.lock().unwrap();
4747 let channel_state = &mut *channel_lock;
4748 match channel_state.by_id.entry(msg.channel_id) {
4749 hash_map::Entry::Occupied(mut chan) => {
4750 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4751 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4753 try_chan_entry!(self, chan.get_mut().update_fee(&self.fee_estimator, &msg), channel_state, chan);
4755 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4760 fn internal_announcement_signatures(&self, counterparty_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) -> Result<(), MsgHandleErrInternal> {
4761 let mut channel_state_lock = self.channel_state.lock().unwrap();
4762 let channel_state = &mut *channel_state_lock;
4764 match channel_state.by_id.entry(msg.channel_id) {
4765 hash_map::Entry::Occupied(mut chan) => {
4766 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4767 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4769 if !chan.get().is_usable() {
4770 return Err(MsgHandleErrInternal::from_no_close(LightningError{err: "Got an announcement_signatures before we were ready for it".to_owned(), action: msgs::ErrorAction::IgnoreError}));
4773 channel_state.pending_msg_events.push(events::MessageSendEvent::BroadcastChannelAnnouncement {
4774 msg: try_chan_entry!(self, chan.get_mut().announcement_signatures(
4775 self.get_our_node_id(), self.genesis_hash.clone(), self.best_block.read().unwrap().height(), msg), channel_state, chan),
4776 // Note that announcement_signatures fails if the channel cannot be announced,
4777 // so get_channel_update_for_broadcast will never fail by the time we get here.
4778 update_msg: self.get_channel_update_for_broadcast(chan.get()).unwrap(),
4781 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4786 /// Returns ShouldPersist if anything changed, otherwise either SkipPersist or an Err.
4787 fn internal_channel_update(&self, counterparty_node_id: &PublicKey, msg: &msgs::ChannelUpdate) -> Result<NotifyOption, MsgHandleErrInternal> {
4788 let mut channel_state_lock = self.channel_state.lock().unwrap();
4789 let channel_state = &mut *channel_state_lock;
4790 let chan_id = match channel_state.short_to_id.get(&msg.contents.short_channel_id) {
4791 Some(chan_id) => chan_id.clone(),
4793 // It's not a local channel
4794 return Ok(NotifyOption::SkipPersist)
4797 match channel_state.by_id.entry(chan_id) {
4798 hash_map::Entry::Occupied(mut chan) => {
4799 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4800 if chan.get().should_announce() {
4801 // If the announcement is about a channel of ours which is public, some
4802 // other peer may simply be forwarding all its gossip to us. Don't provide
4803 // a scary-looking error message and return Ok instead.
4804 return Ok(NotifyOption::SkipPersist);
4806 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a channel_update for a channel from the wrong node - it shouldn't know about our private channels!".to_owned(), chan_id));
4808 let were_node_one = self.get_our_node_id().serialize()[..] < chan.get().get_counterparty_node_id().serialize()[..];
4809 let msg_from_node_one = msg.contents.flags & 1 == 0;
4810 if were_node_one == msg_from_node_one {
4811 return Ok(NotifyOption::SkipPersist);
4813 try_chan_entry!(self, chan.get_mut().channel_update(&msg), channel_state, chan);
4816 hash_map::Entry::Vacant(_) => unreachable!()
4818 Ok(NotifyOption::DoPersist)
4821 fn internal_channel_reestablish(&self, counterparty_node_id: &PublicKey, msg: &msgs::ChannelReestablish) -> Result<(), MsgHandleErrInternal> {
4822 let chan_restoration_res;
4823 let (htlcs_failed_forward, need_lnd_workaround) = {
4824 let mut channel_state_lock = self.channel_state.lock().unwrap();
4825 let channel_state = &mut *channel_state_lock;
4827 match channel_state.by_id.entry(msg.channel_id) {
4828 hash_map::Entry::Occupied(mut chan) => {
4829 if chan.get().get_counterparty_node_id() != *counterparty_node_id {
4830 return Err(MsgHandleErrInternal::send_err_msg_no_close("Got a message for a channel from the wrong node!".to_owned(), msg.channel_id));
4832 // Currently, we expect all holding cell update_adds to be dropped on peer
4833 // disconnect, so Channel's reestablish will never hand us any holding cell
4834 // freed HTLCs to fail backwards. If in the future we no longer drop pending
4835 // add-HTLCs on disconnect, we may be handed HTLCs to fail backwards here.
4836 let responses = try_chan_entry!(self, chan.get_mut().channel_reestablish(
4837 msg, &self.logger, self.our_network_pubkey.clone(), self.genesis_hash,
4838 &*self.best_block.read().unwrap()), channel_state, chan);
4839 let mut channel_update = None;
4840 if let Some(msg) = responses.shutdown_msg {
4841 channel_state.pending_msg_events.push(events::MessageSendEvent::SendShutdown {
4842 node_id: counterparty_node_id.clone(),
4845 } else if chan.get().is_usable() {
4846 // If the channel is in a usable state (ie the channel is not being shut
4847 // down), send a unicast channel_update to our counterparty to make sure
4848 // they have the latest channel parameters.
4849 if let Ok(msg) = self.get_channel_update_for_unicast(chan.get()) {
4850 channel_update = Some(events::MessageSendEvent::SendChannelUpdate {
4851 node_id: chan.get().get_counterparty_node_id(),
4856 let need_lnd_workaround = chan.get_mut().workaround_lnd_bug_4006.take();
4857 chan_restoration_res = handle_chan_restoration_locked!(
4858 self, channel_state_lock, channel_state, chan, responses.raa, responses.commitment_update, responses.order,
4859 responses.mon_update, Vec::new(), None, responses.funding_locked, responses.announcement_sigs);
4860 if let Some(upd) = channel_update {
4861 channel_state.pending_msg_events.push(upd);
4863 (responses.holding_cell_failed_htlcs, need_lnd_workaround)
4865 hash_map::Entry::Vacant(_) => return Err(MsgHandleErrInternal::send_err_msg_no_close("Failed to find corresponding channel".to_owned(), msg.channel_id))
4868 post_handle_chan_restoration!(self, chan_restoration_res);
4869 self.fail_holding_cell_htlcs(htlcs_failed_forward, msg.channel_id);
4871 if let Some(funding_locked_msg) = need_lnd_workaround {
4872 self.internal_funding_locked(counterparty_node_id, &funding_locked_msg)?;
4877 /// Process pending events from the `chain::Watch`, returning whether any events were processed.
4878 fn process_pending_monitor_events(&self) -> bool {
4879 let mut failed_channels = Vec::new();
4880 let mut pending_monitor_events = self.chain_monitor.release_pending_monitor_events();
4881 let has_pending_monitor_events = !pending_monitor_events.is_empty();
4882 for (funding_outpoint, mut monitor_events) in pending_monitor_events.drain(..) {
4883 for monitor_event in monitor_events.drain(..) {
4884 match monitor_event {
4885 MonitorEvent::HTLCEvent(htlc_update) => {
4886 if let Some(preimage) = htlc_update.payment_preimage {
4887 log_trace!(self.logger, "Claiming HTLC with preimage {} from our monitor", log_bytes!(preimage.0));
4888 self.claim_funds_internal(self.channel_state.lock().unwrap(), htlc_update.source, preimage, htlc_update.onchain_value_satoshis.map(|v| v * 1000), true, funding_outpoint.to_channel_id());
4890 log_trace!(self.logger, "Failing HTLC with hash {} from our monitor", log_bytes!(htlc_update.payment_hash.0));
4891 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() });
4894 MonitorEvent::CommitmentTxConfirmed(funding_outpoint) |
4895 MonitorEvent::UpdateFailed(funding_outpoint) => {
4896 let mut channel_lock = self.channel_state.lock().unwrap();
4897 let channel_state = &mut *channel_lock;
4898 let by_id = &mut channel_state.by_id;
4899 let pending_msg_events = &mut channel_state.pending_msg_events;
4900 if let hash_map::Entry::Occupied(chan_entry) = by_id.entry(funding_outpoint.to_channel_id()) {
4901 let mut chan = remove_channel!(self, channel_state, chan_entry);
4902 failed_channels.push(chan.force_shutdown(false));
4903 if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
4904 pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
4908 let reason = if let MonitorEvent::UpdateFailed(_) = monitor_event {
4909 ClosureReason::ProcessingError { err: "Failed to persist ChannelMonitor update during chain sync".to_string() }
4911 ClosureReason::CommitmentTxConfirmed
4913 self.issue_channel_close_events(&chan, reason);
4914 pending_msg_events.push(events::MessageSendEvent::HandleError {
4915 node_id: chan.get_counterparty_node_id(),
4916 action: msgs::ErrorAction::SendErrorMessage {
4917 msg: msgs::ErrorMessage { channel_id: chan.channel_id(), data: "Channel force-closed".to_owned() }
4922 MonitorEvent::UpdateCompleted { funding_txo, monitor_update_id } => {
4923 self.channel_monitor_updated(&funding_txo, monitor_update_id);
4929 for failure in failed_channels.drain(..) {
4930 self.finish_force_close_channel(failure);
4933 has_pending_monitor_events
4936 /// In chanmon_consistency_target, we'd like to be able to restore monitor updating without
4937 /// handling all pending events (i.e. not PendingHTLCsForwardable). Thus, we expose monitor
4938 /// update events as a separate process method here.
4940 pub fn process_monitor_events(&self) {
4941 self.process_pending_monitor_events();
4944 /// Check the holding cell in each channel and free any pending HTLCs in them if possible.
4945 /// Returns whether there were any updates such as if pending HTLCs were freed or a monitor
4946 /// update was applied.
4948 /// This should only apply to HTLCs which were added to the holding cell because we were
4949 /// waiting on a monitor update to finish. In that case, we don't want to free the holding cell
4950 /// directly in `channel_monitor_updated` as it may introduce deadlocks calling back into user
4951 /// code to inform them of a channel monitor update.
4952 fn check_free_holding_cells(&self) -> bool {
4953 let mut has_monitor_update = false;
4954 let mut failed_htlcs = Vec::new();
4955 let mut handle_errors = Vec::new();
4957 let mut channel_state_lock = self.channel_state.lock().unwrap();
4958 let channel_state = &mut *channel_state_lock;
4959 let by_id = &mut channel_state.by_id;
4960 let short_to_id = &mut channel_state.short_to_id;
4961 let pending_msg_events = &mut channel_state.pending_msg_events;
4963 by_id.retain(|channel_id, chan| {
4964 match chan.maybe_free_holding_cell_htlcs(&self.logger) {
4965 Ok((commitment_opt, holding_cell_failed_htlcs)) => {
4966 if !holding_cell_failed_htlcs.is_empty() {
4967 failed_htlcs.push((holding_cell_failed_htlcs, *channel_id));
4969 if let Some((commitment_update, monitor_update)) = commitment_opt {
4970 if let Err(e) = self.chain_monitor.update_channel(chan.get_funding_txo().unwrap(), monitor_update) {
4971 has_monitor_update = true;
4972 let (res, close_channel) = handle_monitor_err!(self, e, short_to_id, chan, RAACommitmentOrder::CommitmentFirst, channel_id, COMMITMENT_UPDATE_ONLY);
4973 handle_errors.push((chan.get_counterparty_node_id(), res));
4974 if close_channel { return false; }
4976 pending_msg_events.push(events::MessageSendEvent::UpdateHTLCs {
4977 node_id: chan.get_counterparty_node_id(),
4978 updates: commitment_update,
4985 let (close_channel, res) = convert_chan_err!(self, e, short_to_id, chan, channel_id);
4986 handle_errors.push((chan.get_counterparty_node_id(), Err(res)));
4987 // ChannelClosed event is generated by handle_error for us
4994 let has_update = has_monitor_update || !failed_htlcs.is_empty() || !handle_errors.is_empty();
4995 for (failures, channel_id) in failed_htlcs.drain(..) {
4996 self.fail_holding_cell_htlcs(failures, channel_id);
4999 for (counterparty_node_id, err) in handle_errors.drain(..) {
5000 let _ = handle_error!(self, err, counterparty_node_id);
5006 /// Check whether any channels have finished removing all pending updates after a shutdown
5007 /// exchange and can now send a closing_signed.
5008 /// Returns whether any closing_signed messages were generated.
5009 fn maybe_generate_initial_closing_signed(&self) -> bool {
5010 let mut handle_errors: Vec<(PublicKey, Result<(), _>)> = Vec::new();
5011 let mut has_update = false;
5013 let mut channel_state_lock = self.channel_state.lock().unwrap();
5014 let channel_state = &mut *channel_state_lock;
5015 let by_id = &mut channel_state.by_id;
5016 let short_to_id = &mut channel_state.short_to_id;
5017 let pending_msg_events = &mut channel_state.pending_msg_events;
5019 by_id.retain(|channel_id, chan| {
5020 match chan.maybe_propose_closing_signed(&self.fee_estimator, &self.logger) {
5021 Ok((msg_opt, tx_opt)) => {
5022 if let Some(msg) = msg_opt {
5024 pending_msg_events.push(events::MessageSendEvent::SendClosingSigned {
5025 node_id: chan.get_counterparty_node_id(), msg,
5028 if let Some(tx) = tx_opt {
5029 // We're done with this channel. We got a closing_signed and sent back
5030 // a closing_signed with a closing transaction to broadcast.
5031 if let Ok(update) = self.get_channel_update_for_broadcast(&chan) {
5032 pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
5037 self.issue_channel_close_events(chan, ClosureReason::CooperativeClosure);
5039 log_info!(self.logger, "Broadcasting {}", log_tx!(tx));
5040 self.tx_broadcaster.broadcast_transaction(&tx);
5041 update_maps_on_chan_removal!(self, short_to_id, chan);
5047 let (close_channel, res) = convert_chan_err!(self, e, short_to_id, chan, channel_id);
5048 handle_errors.push((chan.get_counterparty_node_id(), Err(res)));
5055 for (counterparty_node_id, err) in handle_errors.drain(..) {
5056 let _ = handle_error!(self, err, counterparty_node_id);
5062 /// Handle a list of channel failures during a block_connected or block_disconnected call,
5063 /// pushing the channel monitor update (if any) to the background events queue and removing the
5065 fn handle_init_event_channel_failures(&self, mut failed_channels: Vec<ShutdownResult>) {
5066 for mut failure in failed_channels.drain(..) {
5067 // Either a commitment transactions has been confirmed on-chain or
5068 // Channel::block_disconnected detected that the funding transaction has been
5069 // reorganized out of the main chain.
5070 // We cannot broadcast our latest local state via monitor update (as
5071 // Channel::force_shutdown tries to make us do) as we may still be in initialization,
5072 // so we track the update internally and handle it when the user next calls
5073 // timer_tick_occurred, guaranteeing we're running normally.
5074 if let Some((funding_txo, update)) = failure.0.take() {
5075 assert_eq!(update.updates.len(), 1);
5076 if let ChannelMonitorUpdateStep::ChannelForceClosed { should_broadcast } = update.updates[0] {
5077 assert!(should_broadcast);
5078 } else { unreachable!(); }
5079 self.pending_background_events.lock().unwrap().push(BackgroundEvent::ClosingMonitorUpdate((funding_txo, update)));
5081 self.finish_force_close_channel(failure);
5085 fn set_payment_hash_secret_map(&self, payment_hash: PaymentHash, payment_preimage: Option<PaymentPreimage>, min_value_msat: Option<u64>, invoice_expiry_delta_secs: u32) -> Result<PaymentSecret, APIError> {
5086 assert!(invoice_expiry_delta_secs <= 60*60*24*365); // Sadly bitcoin timestamps are u32s, so panic before 2106
5088 if min_value_msat.is_some() && min_value_msat.unwrap() > MAX_VALUE_MSAT {
5089 return Err(APIError::APIMisuseError { err: format!("min_value_msat of {} greater than total 21 million bitcoin supply", min_value_msat.unwrap()) });
5092 let payment_secret = PaymentSecret(self.keys_manager.get_secure_random_bytes());
5094 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5095 let mut payment_secrets = self.pending_inbound_payments.lock().unwrap();
5096 match payment_secrets.entry(payment_hash) {
5097 hash_map::Entry::Vacant(e) => {
5098 e.insert(PendingInboundPayment {
5099 payment_secret, min_value_msat, payment_preimage,
5100 user_payment_id: 0, // For compatibility with version 0.0.103 and earlier
5101 // We assume that highest_seen_timestamp is pretty close to the current time -
5102 // it's updated when we receive a new block with the maximum time we've seen in
5103 // a header. It should never be more than two hours in the future.
5104 // Thus, we add two hours here as a buffer to ensure we absolutely
5105 // never fail a payment too early.
5106 // Note that we assume that received blocks have reasonably up-to-date
5108 expiry_time: self.highest_seen_timestamp.load(Ordering::Acquire) as u64 + invoice_expiry_delta_secs as u64 + 7200,
5111 hash_map::Entry::Occupied(_) => return Err(APIError::APIMisuseError { err: "Duplicate payment hash".to_owned() }),
5116 /// Gets a payment secret and payment hash for use in an invoice given to a third party wishing
5119 /// This differs from [`create_inbound_payment_for_hash`] only in that it generates the
5120 /// [`PaymentHash`] and [`PaymentPreimage`] for you.
5122 /// The [`PaymentPreimage`] will ultimately be returned to you in the [`PaymentReceived`], which
5123 /// will have the [`PaymentReceived::payment_preimage`] field filled in. That should then be
5124 /// passed directly to [`claim_funds`].
5126 /// See [`create_inbound_payment_for_hash`] for detailed documentation on behavior and requirements.
5128 /// Note that a malicious eavesdropper can intuit whether an inbound payment was created by
5129 /// `create_inbound_payment` or `create_inbound_payment_for_hash` based on runtime.
5133 /// If you register an inbound payment with this method, then serialize the `ChannelManager`, then
5134 /// deserialize it with a node running 0.0.103 and earlier, the payment will fail to be received.
5136 /// Errors if `min_value_msat` is greater than total bitcoin supply.
5138 /// [`claim_funds`]: Self::claim_funds
5139 /// [`PaymentReceived`]: events::Event::PaymentReceived
5140 /// [`PaymentReceived::payment_preimage`]: events::Event::PaymentReceived::payment_preimage
5141 /// [`create_inbound_payment_for_hash`]: Self::create_inbound_payment_for_hash
5142 pub fn create_inbound_payment(&self, min_value_msat: Option<u64>, invoice_expiry_delta_secs: u32) -> Result<(PaymentHash, PaymentSecret), ()> {
5143 inbound_payment::create(&self.inbound_payment_key, min_value_msat, invoice_expiry_delta_secs, &self.keys_manager, self.highest_seen_timestamp.load(Ordering::Acquire) as u64)
5146 /// Legacy version of [`create_inbound_payment`]. Use this method if you wish to share
5147 /// serialized state with LDK node(s) running 0.0.103 and earlier.
5149 /// May panic if `invoice_expiry_delta_secs` is greater than one year.
5152 /// This method is deprecated and will be removed soon.
5154 /// [`create_inbound_payment`]: Self::create_inbound_payment
5156 pub fn create_inbound_payment_legacy(&self, min_value_msat: Option<u64>, invoice_expiry_delta_secs: u32) -> Result<(PaymentHash, PaymentSecret), APIError> {
5157 let payment_preimage = PaymentPreimage(self.keys_manager.get_secure_random_bytes());
5158 let payment_hash = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
5159 let payment_secret = self.set_payment_hash_secret_map(payment_hash, Some(payment_preimage), min_value_msat, invoice_expiry_delta_secs)?;
5160 Ok((payment_hash, payment_secret))
5163 /// Gets a [`PaymentSecret`] for a given [`PaymentHash`], for which the payment preimage is
5164 /// stored external to LDK.
5166 /// A [`PaymentReceived`] event will only be generated if the [`PaymentSecret`] matches a
5167 /// payment secret fetched via this method or [`create_inbound_payment`], and which is at least
5168 /// the `min_value_msat` provided here, if one is provided.
5170 /// The [`PaymentHash`] (and corresponding [`PaymentPreimage`]) should be globally unique, though
5171 /// note that LDK will not stop you from registering duplicate payment hashes for inbound
5174 /// `min_value_msat` should be set if the invoice being generated contains a value. Any payment
5175 /// received for the returned [`PaymentHash`] will be required to be at least `min_value_msat`
5176 /// before a [`PaymentReceived`] event will be generated, ensuring that we do not provide the
5177 /// sender "proof-of-payment" unless they have paid the required amount.
5179 /// `invoice_expiry_delta_secs` describes the number of seconds that the invoice is valid for
5180 /// in excess of the current time. This should roughly match the expiry time set in the invoice.
5181 /// After this many seconds, we will remove the inbound payment, resulting in any attempts to
5182 /// pay the invoice failing. The BOLT spec suggests 3,600 secs as a default validity time for
5183 /// invoices when no timeout is set.
5185 /// Note that we use block header time to time-out pending inbound payments (with some margin
5186 /// to compensate for the inaccuracy of block header timestamps). Thus, in practice we will
5187 /// accept a payment and generate a [`PaymentReceived`] event for some time after the expiry.
5188 /// If you need exact expiry semantics, you should enforce them upon receipt of
5189 /// [`PaymentReceived`].
5191 /// Note that invoices generated for inbound payments should have their `min_final_cltv_expiry`
5192 /// set to at least [`MIN_FINAL_CLTV_EXPIRY`].
5194 /// Note that a malicious eavesdropper can intuit whether an inbound payment was created by
5195 /// `create_inbound_payment` or `create_inbound_payment_for_hash` based on runtime.
5199 /// If you register an inbound payment with this method, then serialize the `ChannelManager`, then
5200 /// deserialize it with a node running 0.0.103 and earlier, the payment will fail to be received.
5202 /// Errors if `min_value_msat` is greater than total bitcoin supply.
5204 /// [`create_inbound_payment`]: Self::create_inbound_payment
5205 /// [`PaymentReceived`]: events::Event::PaymentReceived
5206 pub fn create_inbound_payment_for_hash(&self, payment_hash: PaymentHash, min_value_msat: Option<u64>, invoice_expiry_delta_secs: u32) -> Result<PaymentSecret, ()> {
5207 inbound_payment::create_from_hash(&self.inbound_payment_key, min_value_msat, payment_hash, invoice_expiry_delta_secs, self.highest_seen_timestamp.load(Ordering::Acquire) as u64)
5210 /// Legacy version of [`create_inbound_payment_for_hash`]. Use this method if you wish to share
5211 /// serialized state with LDK node(s) running 0.0.103 and earlier.
5213 /// May panic if `invoice_expiry_delta_secs` is greater than one year.
5216 /// This method is deprecated and will be removed soon.
5218 /// [`create_inbound_payment_for_hash`]: Self::create_inbound_payment_for_hash
5220 pub fn create_inbound_payment_for_hash_legacy(&self, payment_hash: PaymentHash, min_value_msat: Option<u64>, invoice_expiry_delta_secs: u32) -> Result<PaymentSecret, APIError> {
5221 self.set_payment_hash_secret_map(payment_hash, None, min_value_msat, invoice_expiry_delta_secs)
5224 /// Gets an LDK-generated payment preimage from a payment hash and payment secret that were
5225 /// previously returned from [`create_inbound_payment`].
5227 /// [`create_inbound_payment`]: Self::create_inbound_payment
5228 pub fn get_payment_preimage(&self, payment_hash: PaymentHash, payment_secret: PaymentSecret) -> Result<PaymentPreimage, APIError> {
5229 inbound_payment::get_payment_preimage(payment_hash, payment_secret, &self.inbound_payment_key)
5232 /// Gets a fake short channel id for use in receiving [phantom node payments]. These fake scids
5233 /// are used when constructing the phantom invoice's route hints.
5235 /// [phantom node payments]: crate::chain::keysinterface::PhantomKeysManager
5236 pub fn get_phantom_scid(&self) -> u64 {
5237 let mut channel_state = self.channel_state.lock().unwrap();
5238 let best_block = self.best_block.read().unwrap();
5240 let scid_candidate = fake_scid::Namespace::Phantom.get_fake_scid(best_block.height(), &self.genesis_hash, &self.fake_scid_rand_bytes, &self.keys_manager);
5241 // Ensure the generated scid doesn't conflict with a real channel.
5242 match channel_state.short_to_id.entry(scid_candidate) {
5243 hash_map::Entry::Occupied(_) => continue,
5244 hash_map::Entry::Vacant(_) => return scid_candidate
5249 /// Gets route hints for use in receiving [phantom node payments].
5251 /// [phantom node payments]: crate::chain::keysinterface::PhantomKeysManager
5252 pub fn get_phantom_route_hints(&self) -> PhantomRouteHints {
5254 channels: self.list_usable_channels(),
5255 phantom_scid: self.get_phantom_scid(),
5256 real_node_pubkey: self.get_our_node_id(),
5260 #[cfg(any(test, fuzzing, feature = "_test_utils"))]
5261 pub fn get_and_clear_pending_events(&self) -> Vec<events::Event> {
5262 let events = core::cell::RefCell::new(Vec::new());
5263 let event_handler = |event: &events::Event| events.borrow_mut().push(event.clone());
5264 self.process_pending_events(&event_handler);
5269 pub fn has_pending_payments(&self) -> bool {
5270 !self.pending_outbound_payments.lock().unwrap().is_empty()
5274 pub fn clear_pending_payments(&self) {
5275 self.pending_outbound_payments.lock().unwrap().clear()
5279 impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> MessageSendEventsProvider for ChannelManager<Signer, M, T, K, F, L>
5280 where M::Target: chain::Watch<Signer>,
5281 T::Target: BroadcasterInterface,
5282 K::Target: KeysInterface<Signer = Signer>,
5283 F::Target: FeeEstimator,
5286 fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent> {
5287 let events = RefCell::new(Vec::new());
5288 PersistenceNotifierGuard::optionally_notify(&self.total_consistency_lock, &self.persistence_notifier, || {
5289 let mut result = NotifyOption::SkipPersist;
5291 // TODO: This behavior should be documented. It's unintuitive that we query
5292 // ChannelMonitors when clearing other events.
5293 if self.process_pending_monitor_events() {
5294 result = NotifyOption::DoPersist;
5297 if self.check_free_holding_cells() {
5298 result = NotifyOption::DoPersist;
5300 if self.maybe_generate_initial_closing_signed() {
5301 result = NotifyOption::DoPersist;
5304 let mut pending_events = Vec::new();
5305 let mut channel_state = self.channel_state.lock().unwrap();
5306 mem::swap(&mut pending_events, &mut channel_state.pending_msg_events);
5308 if !pending_events.is_empty() {
5309 events.replace(pending_events);
5318 impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> EventsProvider for ChannelManager<Signer, M, T, K, F, L>
5320 M::Target: chain::Watch<Signer>,
5321 T::Target: BroadcasterInterface,
5322 K::Target: KeysInterface<Signer = Signer>,
5323 F::Target: FeeEstimator,
5326 /// Processes events that must be periodically handled.
5328 /// An [`EventHandler`] may safely call back to the provider in order to handle an event.
5329 /// However, it must not call [`Writeable::write`] as doing so would result in a deadlock.
5331 /// Pending events are persisted as part of [`ChannelManager`]. While these events are cleared
5332 /// when processed, an [`EventHandler`] must be able to handle previously seen events when
5333 /// restarting from an old state.
5334 fn process_pending_events<H: Deref>(&self, handler: H) where H::Target: EventHandler {
5335 PersistenceNotifierGuard::optionally_notify(&self.total_consistency_lock, &self.persistence_notifier, || {
5336 let mut result = NotifyOption::SkipPersist;
5338 // TODO: This behavior should be documented. It's unintuitive that we query
5339 // ChannelMonitors when clearing other events.
5340 if self.process_pending_monitor_events() {
5341 result = NotifyOption::DoPersist;
5344 let mut pending_events = mem::replace(&mut *self.pending_events.lock().unwrap(), vec![]);
5345 if !pending_events.is_empty() {
5346 result = NotifyOption::DoPersist;
5349 for event in pending_events.drain(..) {
5350 handler.handle_event(&event);
5358 impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> chain::Listen for ChannelManager<Signer, M, T, K, F, L>
5360 M::Target: chain::Watch<Signer>,
5361 T::Target: BroadcasterInterface,
5362 K::Target: KeysInterface<Signer = Signer>,
5363 F::Target: FeeEstimator,
5366 fn filtered_block_connected(&self, header: &BlockHeader, txdata: &TransactionData, height: u32) {
5368 let best_block = self.best_block.read().unwrap();
5369 assert_eq!(best_block.block_hash(), header.prev_blockhash,
5370 "Blocks must be connected in chain-order - the connected header must build on the last connected header");
5371 assert_eq!(best_block.height(), height - 1,
5372 "Blocks must be connected in chain-order - the connected block height must be one greater than the previous height");
5375 self.transactions_confirmed(header, txdata, height);
5376 self.best_block_updated(header, height);
5379 fn block_disconnected(&self, header: &BlockHeader, height: u32) {
5380 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5381 let new_height = height - 1;
5383 let mut best_block = self.best_block.write().unwrap();
5384 assert_eq!(best_block.block_hash(), header.block_hash(),
5385 "Blocks must be disconnected in chain-order - the disconnected header must be the last connected header");
5386 assert_eq!(best_block.height(), height,
5387 "Blocks must be disconnected in chain-order - the disconnected block must have the correct height");
5388 *best_block = BestBlock::new(header.prev_blockhash, new_height)
5391 self.do_chain_event(Some(new_height), |channel| channel.best_block_updated(new_height, header.time, self.genesis_hash.clone(), self.get_our_node_id(), &self.logger));
5395 impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> chain::Confirm for ChannelManager<Signer, M, T, K, F, L>
5397 M::Target: chain::Watch<Signer>,
5398 T::Target: BroadcasterInterface,
5399 K::Target: KeysInterface<Signer = Signer>,
5400 F::Target: FeeEstimator,
5403 fn transactions_confirmed(&self, header: &BlockHeader, txdata: &TransactionData, height: u32) {
5404 // Note that we MUST NOT end up calling methods on self.chain_monitor here - we're called
5405 // during initialization prior to the chain_monitor being fully configured in some cases.
5406 // See the docs for `ChannelManagerReadArgs` for more.
5408 let block_hash = header.block_hash();
5409 log_trace!(self.logger, "{} transactions included in block {} at height {} provided", txdata.len(), block_hash, height);
5411 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5412 self.do_chain_event(Some(height), |channel| channel.transactions_confirmed(&block_hash, height, txdata, self.genesis_hash.clone(), self.get_our_node_id(), &self.logger)
5413 .map(|(a, b)| (a, Vec::new(), b)));
5415 let last_best_block_height = self.best_block.read().unwrap().height();
5416 if height < last_best_block_height {
5417 let timestamp = self.highest_seen_timestamp.load(Ordering::Acquire);
5418 self.do_chain_event(Some(last_best_block_height), |channel| channel.best_block_updated(last_best_block_height, timestamp as u32, self.genesis_hash.clone(), self.get_our_node_id(), &self.logger));
5422 fn best_block_updated(&self, header: &BlockHeader, height: u32) {
5423 // Note that we MUST NOT end up calling methods on self.chain_monitor here - we're called
5424 // during initialization prior to the chain_monitor being fully configured in some cases.
5425 // See the docs for `ChannelManagerReadArgs` for more.
5427 let block_hash = header.block_hash();
5428 log_trace!(self.logger, "New best block: {} at height {}", block_hash, height);
5430 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5432 *self.best_block.write().unwrap() = BestBlock::new(block_hash, height);
5434 self.do_chain_event(Some(height), |channel| channel.best_block_updated(height, header.time, self.genesis_hash.clone(), self.get_our_node_id(), &self.logger));
5436 macro_rules! max_time {
5437 ($timestamp: expr) => {
5439 // Update $timestamp to be the max of its current value and the block
5440 // timestamp. This should keep us close to the current time without relying on
5441 // having an explicit local time source.
5442 // Just in case we end up in a race, we loop until we either successfully
5443 // update $timestamp or decide we don't need to.
5444 let old_serial = $timestamp.load(Ordering::Acquire);
5445 if old_serial >= header.time as usize { break; }
5446 if $timestamp.compare_exchange(old_serial, header.time as usize, Ordering::AcqRel, Ordering::Relaxed).is_ok() {
5452 max_time!(self.last_node_announcement_serial);
5453 max_time!(self.highest_seen_timestamp);
5454 let mut payment_secrets = self.pending_inbound_payments.lock().unwrap();
5455 payment_secrets.retain(|_, inbound_payment| {
5456 inbound_payment.expiry_time > header.time as u64
5459 let mut outbounds = self.pending_outbound_payments.lock().unwrap();
5460 let mut pending_events = self.pending_events.lock().unwrap();
5461 outbounds.retain(|payment_id, payment| {
5462 if payment.remaining_parts() != 0 { return true }
5463 if let PendingOutboundPayment::Retryable { starting_block_height, payment_hash, .. } = payment {
5464 if *starting_block_height + PAYMENT_EXPIRY_BLOCKS <= height {
5465 log_info!(self.logger, "Timing out payment with id {} and hash {}", log_bytes!(payment_id.0), log_bytes!(payment_hash.0));
5466 pending_events.push(events::Event::PaymentFailed {
5467 payment_id: *payment_id, payment_hash: *payment_hash,
5475 fn get_relevant_txids(&self) -> Vec<Txid> {
5476 let channel_state = self.channel_state.lock().unwrap();
5477 let mut res = Vec::with_capacity(channel_state.short_to_id.len());
5478 for chan in channel_state.by_id.values() {
5479 if let Some(funding_txo) = chan.get_funding_txo() {
5480 res.push(funding_txo.txid);
5486 fn transaction_unconfirmed(&self, txid: &Txid) {
5487 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5488 self.do_chain_event(None, |channel| {
5489 if let Some(funding_txo) = channel.get_funding_txo() {
5490 if funding_txo.txid == *txid {
5491 channel.funding_transaction_unconfirmed(&self.logger).map(|()| (None, Vec::new(), None))
5492 } else { Ok((None, Vec::new(), None)) }
5493 } else { Ok((None, Vec::new(), None)) }
5498 impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> ChannelManager<Signer, M, T, K, F, L>
5500 M::Target: chain::Watch<Signer>,
5501 T::Target: BroadcasterInterface,
5502 K::Target: KeysInterface<Signer = Signer>,
5503 F::Target: FeeEstimator,
5506 /// Calls a function which handles an on-chain event (blocks dis/connected, transactions
5507 /// un/confirmed, etc) on each channel, handling any resulting errors or messages generated by
5509 fn do_chain_event<FN: Fn(&mut Channel<Signer>) -> Result<(Option<msgs::FundingLocked>, Vec<(HTLCSource, PaymentHash)>, Option<msgs::AnnouncementSignatures>), ClosureReason>>
5510 (&self, height_opt: Option<u32>, f: FN) {
5511 // Note that we MUST NOT end up calling methods on self.chain_monitor here - we're called
5512 // during initialization prior to the chain_monitor being fully configured in some cases.
5513 // See the docs for `ChannelManagerReadArgs` for more.
5515 let mut failed_channels = Vec::new();
5516 let mut timed_out_htlcs = Vec::new();
5518 let mut channel_lock = self.channel_state.lock().unwrap();
5519 let channel_state = &mut *channel_lock;
5520 let short_to_id = &mut channel_state.short_to_id;
5521 let pending_msg_events = &mut channel_state.pending_msg_events;
5522 channel_state.by_id.retain(|_, channel| {
5523 let res = f(channel);
5524 if let Ok((funding_locked_opt, mut timed_out_pending_htlcs, announcement_sigs)) = res {
5525 for (source, payment_hash) in timed_out_pending_htlcs.drain(..) {
5526 let (failure_code, data) = self.get_htlc_inbound_temp_fail_err_and_data(0x1000|14 /* expiry_too_soon */, &channel);
5527 timed_out_htlcs.push((source, payment_hash, HTLCFailReason::Reason {
5531 if let Some(funding_locked) = funding_locked_opt {
5532 send_funding_locked!(short_to_id, pending_msg_events, channel, funding_locked);
5533 if channel.is_usable() {
5534 log_trace!(self.logger, "Sending funding_locked with private initial channel_update for our counterparty on channel {}", log_bytes!(channel.channel_id()));
5535 if let Ok(msg) = self.get_channel_update_for_unicast(channel) {
5536 pending_msg_events.push(events::MessageSendEvent::SendChannelUpdate {
5537 node_id: channel.get_counterparty_node_id(),
5542 log_trace!(self.logger, "Sending funding_locked WITHOUT channel_update for {}", log_bytes!(channel.channel_id()));
5545 if let Some(announcement_sigs) = announcement_sigs {
5546 log_trace!(self.logger, "Sending announcement_signatures for channel {}", log_bytes!(channel.channel_id()));
5547 pending_msg_events.push(events::MessageSendEvent::SendAnnouncementSignatures {
5548 node_id: channel.get_counterparty_node_id(),
5549 msg: announcement_sigs,
5551 if let Some(height) = height_opt {
5552 if let Some(announcement) = channel.get_signed_channel_announcement(self.get_our_node_id(), self.genesis_hash, height) {
5553 pending_msg_events.push(events::MessageSendEvent::BroadcastChannelAnnouncement {
5555 // Note that announcement_signatures fails if the channel cannot be announced,
5556 // so get_channel_update_for_broadcast will never fail by the time we get here.
5557 update_msg: self.get_channel_update_for_broadcast(channel).unwrap(),
5562 if channel.is_our_funding_locked() {
5563 if let Some(real_scid) = channel.get_short_channel_id() {
5564 // If we sent a 0conf funding_locked, and now have an SCID, we add it
5565 // to the short_to_id map here. Note that we check whether we can relay
5566 // using the real SCID at relay-time (i.e. enforce option_scid_alias
5567 // then), and if the funding tx is ever un-confirmed we force-close the
5568 // channel, ensuring short_to_id is always consistent.
5569 let scid_insert = short_to_id.insert(real_scid, channel.channel_id());
5570 assert!(scid_insert.is_none() || scid_insert.unwrap() == channel.channel_id(),
5571 "SCIDs should never collide - ensure you weren't behind by a full {} blocks when creating channels",
5572 fake_scid::MAX_SCID_BLOCKS_FROM_NOW);
5575 } else if let Err(reason) = res {
5576 update_maps_on_chan_removal!(self, short_to_id, channel);
5577 // It looks like our counterparty went on-chain or funding transaction was
5578 // reorged out of the main chain. Close the channel.
5579 failed_channels.push(channel.force_shutdown(true));
5580 if let Ok(update) = self.get_channel_update_for_broadcast(&channel) {
5581 pending_msg_events.push(events::MessageSendEvent::BroadcastChannelUpdate {
5585 let reason_message = format!("{}", reason);
5586 self.issue_channel_close_events(channel, reason);
5587 pending_msg_events.push(events::MessageSendEvent::HandleError {
5588 node_id: channel.get_counterparty_node_id(),
5589 action: msgs::ErrorAction::SendErrorMessage { msg: msgs::ErrorMessage {
5590 channel_id: channel.channel_id(),
5591 data: reason_message,
5599 if let Some(height) = height_opt {
5600 channel_state.claimable_htlcs.retain(|payment_hash, htlcs| {
5601 htlcs.retain(|htlc| {
5602 // If height is approaching the number of blocks we think it takes us to get
5603 // our commitment transaction confirmed before the HTLC expires, plus the
5604 // number of blocks we generally consider it to take to do a commitment update,
5605 // just give up on it and fail the HTLC.
5606 if height >= htlc.cltv_expiry - HTLC_FAIL_BACK_BUFFER {
5607 let mut htlc_msat_height_data = byte_utils::be64_to_array(htlc.value).to_vec();
5608 htlc_msat_height_data.extend_from_slice(&byte_utils::be32_to_array(height));
5609 timed_out_htlcs.push((HTLCSource::PreviousHopData(htlc.prev_hop.clone()), payment_hash.clone(), HTLCFailReason::Reason {
5610 failure_code: 0x4000 | 15,
5611 data: htlc_msat_height_data
5616 !htlcs.is_empty() // Only retain this entry if htlcs has at least one entry.
5621 self.handle_init_event_channel_failures(failed_channels);
5623 for (source, payment_hash, reason) in timed_out_htlcs.drain(..) {
5624 self.fail_htlc_backwards_internal(self.channel_state.lock().unwrap(), source, &payment_hash, reason);
5628 /// Blocks until ChannelManager needs to be persisted or a timeout is reached. It returns a bool
5629 /// indicating whether persistence is necessary. Only one listener on
5630 /// `await_persistable_update` or `await_persistable_update_timeout` is guaranteed to be woken
5633 /// Note that this method is not available with the `no-std` feature.
5634 #[cfg(any(test, feature = "std"))]
5635 pub fn await_persistable_update_timeout(&self, max_wait: Duration) -> bool {
5636 self.persistence_notifier.wait_timeout(max_wait)
5639 /// Blocks until ChannelManager needs to be persisted. Only one listener on
5640 /// `await_persistable_update` or `await_persistable_update_timeout` is guaranteed to be woken
5642 pub fn await_persistable_update(&self) {
5643 self.persistence_notifier.wait()
5646 #[cfg(any(test, feature = "_test_utils"))]
5647 pub fn get_persistence_condvar_value(&self) -> bool {
5648 let mutcond = &self.persistence_notifier.persistence_lock;
5649 let &(ref mtx, _) = mutcond;
5650 let guard = mtx.lock().unwrap();
5654 /// Gets the latest best block which was connected either via the [`chain::Listen`] or
5655 /// [`chain::Confirm`] interfaces.
5656 pub fn current_best_block(&self) -> BestBlock {
5657 self.best_block.read().unwrap().clone()
5661 impl<Signer: Sign, M: Deref , T: Deref , K: Deref , F: Deref , L: Deref >
5662 ChannelMessageHandler for ChannelManager<Signer, M, T, K, F, L>
5663 where M::Target: chain::Watch<Signer>,
5664 T::Target: BroadcasterInterface,
5665 K::Target: KeysInterface<Signer = Signer>,
5666 F::Target: FeeEstimator,
5669 fn handle_open_channel(&self, counterparty_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::OpenChannel) {
5670 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5671 let _ = handle_error!(self, self.internal_open_channel(counterparty_node_id, their_features, msg), *counterparty_node_id);
5674 fn handle_accept_channel(&self, counterparty_node_id: &PublicKey, their_features: InitFeatures, msg: &msgs::AcceptChannel) {
5675 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5676 let _ = handle_error!(self, self.internal_accept_channel(counterparty_node_id, their_features, msg), *counterparty_node_id);
5679 fn handle_funding_created(&self, counterparty_node_id: &PublicKey, msg: &msgs::FundingCreated) {
5680 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5681 let _ = handle_error!(self, self.internal_funding_created(counterparty_node_id, msg), *counterparty_node_id);
5684 fn handle_funding_signed(&self, counterparty_node_id: &PublicKey, msg: &msgs::FundingSigned) {
5685 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5686 let _ = handle_error!(self, self.internal_funding_signed(counterparty_node_id, msg), *counterparty_node_id);
5689 fn handle_funding_locked(&self, counterparty_node_id: &PublicKey, msg: &msgs::FundingLocked) {
5690 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5691 let _ = handle_error!(self, self.internal_funding_locked(counterparty_node_id, msg), *counterparty_node_id);
5694 fn handle_shutdown(&self, counterparty_node_id: &PublicKey, their_features: &InitFeatures, msg: &msgs::Shutdown) {
5695 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5696 let _ = handle_error!(self, self.internal_shutdown(counterparty_node_id, their_features, msg), *counterparty_node_id);
5699 fn handle_closing_signed(&self, counterparty_node_id: &PublicKey, msg: &msgs::ClosingSigned) {
5700 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5701 let _ = handle_error!(self, self.internal_closing_signed(counterparty_node_id, msg), *counterparty_node_id);
5704 fn handle_update_add_htlc(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateAddHTLC) {
5705 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5706 let _ = handle_error!(self, self.internal_update_add_htlc(counterparty_node_id, msg), *counterparty_node_id);
5709 fn handle_update_fulfill_htlc(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFulfillHTLC) {
5710 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5711 let _ = handle_error!(self, self.internal_update_fulfill_htlc(counterparty_node_id, msg), *counterparty_node_id);
5714 fn handle_update_fail_htlc(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFailHTLC) {
5715 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5716 let _ = handle_error!(self, self.internal_update_fail_htlc(counterparty_node_id, msg), *counterparty_node_id);
5719 fn handle_update_fail_malformed_htlc(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFailMalformedHTLC) {
5720 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5721 let _ = handle_error!(self, self.internal_update_fail_malformed_htlc(counterparty_node_id, msg), *counterparty_node_id);
5724 fn handle_commitment_signed(&self, counterparty_node_id: &PublicKey, msg: &msgs::CommitmentSigned) {
5725 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5726 let _ = handle_error!(self, self.internal_commitment_signed(counterparty_node_id, msg), *counterparty_node_id);
5729 fn handle_revoke_and_ack(&self, counterparty_node_id: &PublicKey, msg: &msgs::RevokeAndACK) {
5730 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5731 let _ = handle_error!(self, self.internal_revoke_and_ack(counterparty_node_id, msg), *counterparty_node_id);
5734 fn handle_update_fee(&self, counterparty_node_id: &PublicKey, msg: &msgs::UpdateFee) {
5735 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5736 let _ = handle_error!(self, self.internal_update_fee(counterparty_node_id, msg), *counterparty_node_id);
5739 fn handle_announcement_signatures(&self, counterparty_node_id: &PublicKey, msg: &msgs::AnnouncementSignatures) {
5740 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5741 let _ = handle_error!(self, self.internal_announcement_signatures(counterparty_node_id, msg), *counterparty_node_id);
5744 fn handle_channel_update(&self, counterparty_node_id: &PublicKey, msg: &msgs::ChannelUpdate) {
5745 PersistenceNotifierGuard::optionally_notify(&self.total_consistency_lock, &self.persistence_notifier, || {
5746 if let Ok(persist) = handle_error!(self, self.internal_channel_update(counterparty_node_id, msg), *counterparty_node_id) {
5749 NotifyOption::SkipPersist
5754 fn handle_channel_reestablish(&self, counterparty_node_id: &PublicKey, msg: &msgs::ChannelReestablish) {
5755 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5756 let _ = handle_error!(self, self.internal_channel_reestablish(counterparty_node_id, msg), *counterparty_node_id);
5759 fn peer_disconnected(&self, counterparty_node_id: &PublicKey, no_connection_possible: bool) {
5760 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5761 let mut failed_channels = Vec::new();
5762 let mut no_channels_remain = true;
5764 let mut channel_state_lock = self.channel_state.lock().unwrap();
5765 let channel_state = &mut *channel_state_lock;
5766 let pending_msg_events = &mut channel_state.pending_msg_events;
5767 let short_to_id = &mut channel_state.short_to_id;
5768 log_debug!(self.logger, "Marking channels with {} disconnected and generating channel_updates. We believe we {} make future connections to this peer.",
5769 log_pubkey!(counterparty_node_id), if no_connection_possible { "cannot" } else { "can" });
5770 channel_state.by_id.retain(|_, chan| {
5771 if chan.get_counterparty_node_id() == *counterparty_node_id {
5772 chan.remove_uncommitted_htlcs_and_mark_paused(&self.logger);
5773 if chan.is_shutdown() {
5774 update_maps_on_chan_removal!(self, short_to_id, chan);
5775 self.issue_channel_close_events(chan, ClosureReason::DisconnectedPeer);
5778 no_channels_remain = false;
5783 pending_msg_events.retain(|msg| {
5785 &events::MessageSendEvent::SendAcceptChannel { ref node_id, .. } => node_id != counterparty_node_id,
5786 &events::MessageSendEvent::SendOpenChannel { ref node_id, .. } => node_id != counterparty_node_id,
5787 &events::MessageSendEvent::SendFundingCreated { ref node_id, .. } => node_id != counterparty_node_id,
5788 &events::MessageSendEvent::SendFundingSigned { ref node_id, .. } => node_id != counterparty_node_id,
5789 &events::MessageSendEvent::SendFundingLocked { ref node_id, .. } => node_id != counterparty_node_id,
5790 &events::MessageSendEvent::SendAnnouncementSignatures { ref node_id, .. } => node_id != counterparty_node_id,
5791 &events::MessageSendEvent::UpdateHTLCs { ref node_id, .. } => node_id != counterparty_node_id,
5792 &events::MessageSendEvent::SendRevokeAndACK { ref node_id, .. } => node_id != counterparty_node_id,
5793 &events::MessageSendEvent::SendClosingSigned { ref node_id, .. } => node_id != counterparty_node_id,
5794 &events::MessageSendEvent::SendShutdown { ref node_id, .. } => node_id != counterparty_node_id,
5795 &events::MessageSendEvent::SendChannelReestablish { ref node_id, .. } => node_id != counterparty_node_id,
5796 &events::MessageSendEvent::BroadcastChannelAnnouncement { .. } => true,
5797 &events::MessageSendEvent::BroadcastNodeAnnouncement { .. } => true,
5798 &events::MessageSendEvent::BroadcastChannelUpdate { .. } => true,
5799 &events::MessageSendEvent::SendChannelUpdate { ref node_id, .. } => node_id != counterparty_node_id,
5800 &events::MessageSendEvent::HandleError { ref node_id, .. } => node_id != counterparty_node_id,
5801 &events::MessageSendEvent::SendChannelRangeQuery { .. } => false,
5802 &events::MessageSendEvent::SendShortIdsQuery { .. } => false,
5803 &events::MessageSendEvent::SendReplyChannelRange { .. } => false,
5804 &events::MessageSendEvent::SendGossipTimestampFilter { .. } => false,
5808 if no_channels_remain {
5809 self.per_peer_state.write().unwrap().remove(counterparty_node_id);
5812 for failure in failed_channels.drain(..) {
5813 self.finish_force_close_channel(failure);
5817 fn peer_connected(&self, counterparty_node_id: &PublicKey, init_msg: &msgs::Init) {
5818 log_debug!(self.logger, "Generating channel_reestablish events for {}", log_pubkey!(counterparty_node_id));
5820 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5823 let mut peer_state_lock = self.per_peer_state.write().unwrap();
5824 match peer_state_lock.entry(counterparty_node_id.clone()) {
5825 hash_map::Entry::Vacant(e) => {
5826 e.insert(Mutex::new(PeerState {
5827 latest_features: init_msg.features.clone(),
5830 hash_map::Entry::Occupied(e) => {
5831 e.get().lock().unwrap().latest_features = init_msg.features.clone();
5836 let mut channel_state_lock = self.channel_state.lock().unwrap();
5837 let channel_state = &mut *channel_state_lock;
5838 let pending_msg_events = &mut channel_state.pending_msg_events;
5839 channel_state.by_id.retain(|_, chan| {
5840 if chan.get_counterparty_node_id() == *counterparty_node_id {
5841 if !chan.have_received_message() {
5842 // If we created this (outbound) channel while we were disconnected from the
5843 // peer we probably failed to send the open_channel message, which is now
5844 // lost. We can't have had anything pending related to this channel, so we just
5848 pending_msg_events.push(events::MessageSendEvent::SendChannelReestablish {
5849 node_id: chan.get_counterparty_node_id(),
5850 msg: chan.get_channel_reestablish(&self.logger),
5856 //TODO: Also re-broadcast announcement_signatures
5859 fn handle_error(&self, counterparty_node_id: &PublicKey, msg: &msgs::ErrorMessage) {
5860 let _persistence_guard = PersistenceNotifierGuard::notify_on_drop(&self.total_consistency_lock, &self.persistence_notifier);
5862 if msg.channel_id == [0; 32] {
5863 for chan in self.list_channels() {
5864 if chan.counterparty.node_id == *counterparty_node_id {
5865 // Untrusted messages from peer, we throw away the error if id points to a non-existent channel
5866 let _ = self.force_close_channel_with_peer(&chan.channel_id, counterparty_node_id, Some(&msg.data));
5871 // First check if we can advance the channel type and try again.
5872 let mut channel_state = self.channel_state.lock().unwrap();
5873 if let Some(chan) = channel_state.by_id.get_mut(&msg.channel_id) {
5874 if chan.get_counterparty_node_id() != *counterparty_node_id {
5877 if let Ok(msg) = chan.maybe_handle_error_without_close(self.genesis_hash) {
5878 channel_state.pending_msg_events.push(events::MessageSendEvent::SendOpenChannel {
5879 node_id: *counterparty_node_id,
5887 // Untrusted messages from peer, we throw away the error if id points to a non-existent channel
5888 let _ = self.force_close_channel_with_peer(&msg.channel_id, counterparty_node_id, Some(&msg.data));
5893 /// Used to signal to the ChannelManager persister that the manager needs to be re-persisted to
5894 /// disk/backups, through `await_persistable_update_timeout` and `await_persistable_update`.
5895 struct PersistenceNotifier {
5896 /// Users won't access the persistence_lock directly, but rather wait on its bool using
5897 /// `wait_timeout` and `wait`.
5898 persistence_lock: (Mutex<bool>, Condvar),
5901 impl PersistenceNotifier {
5904 persistence_lock: (Mutex::new(false), Condvar::new()),
5910 let &(ref mtx, ref cvar) = &self.persistence_lock;
5911 let mut guard = mtx.lock().unwrap();
5916 guard = cvar.wait(guard).unwrap();
5917 let result = *guard;
5925 #[cfg(any(test, feature = "std"))]
5926 fn wait_timeout(&self, max_wait: Duration) -> bool {
5927 let current_time = Instant::now();
5929 let &(ref mtx, ref cvar) = &self.persistence_lock;
5930 let mut guard = mtx.lock().unwrap();
5935 guard = cvar.wait_timeout(guard, max_wait).unwrap().0;
5936 // Due to spurious wakeups that can happen on `wait_timeout`, here we need to check if the
5937 // desired wait time has actually passed, and if not then restart the loop with a reduced wait
5938 // time. Note that this logic can be highly simplified through the use of
5939 // `Condvar::wait_while` and `Condvar::wait_timeout_while`, if and when our MSRV is raised to
5941 let elapsed = current_time.elapsed();
5942 let result = *guard;
5943 if result || elapsed >= max_wait {
5947 match max_wait.checked_sub(elapsed) {
5948 None => return result,
5954 // Signal to the ChannelManager persister that there are updates necessitating persisting to disk.
5956 let &(ref persist_mtx, ref cnd) = &self.persistence_lock;
5957 let mut persistence_lock = persist_mtx.lock().unwrap();
5958 *persistence_lock = true;
5959 mem::drop(persistence_lock);
5964 const SERIALIZATION_VERSION: u8 = 1;
5965 const MIN_SERIALIZATION_VERSION: u8 = 1;
5967 impl_writeable_tlv_based!(CounterpartyForwardingInfo, {
5968 (2, fee_base_msat, required),
5969 (4, fee_proportional_millionths, required),
5970 (6, cltv_expiry_delta, required),
5973 impl_writeable_tlv_based!(ChannelCounterparty, {
5974 (2, node_id, required),
5975 (4, features, required),
5976 (6, unspendable_punishment_reserve, required),
5977 (8, forwarding_info, option),
5978 (9, outbound_htlc_minimum_msat, option),
5979 (11, outbound_htlc_maximum_msat, option),
5982 impl_writeable_tlv_based!(ChannelDetails, {
5983 (1, inbound_scid_alias, option),
5984 (2, channel_id, required),
5985 (3, channel_type, option),
5986 (4, counterparty, required),
5987 (6, funding_txo, option),
5988 (8, short_channel_id, option),
5989 (10, channel_value_satoshis, required),
5990 (12, unspendable_punishment_reserve, option),
5991 (14, user_channel_id, required),
5992 (16, balance_msat, required),
5993 (18, outbound_capacity_msat, required),
5994 // Note that by the time we get past the required read above, outbound_capacity_msat will be
5995 // filled in, so we can safely unwrap it here.
5996 (19, next_outbound_htlc_limit_msat, (default_value, outbound_capacity_msat.0.unwrap())),
5997 (20, inbound_capacity_msat, required),
5998 (22, confirmations_required, option),
5999 (24, force_close_spend_delay, option),
6000 (26, is_outbound, required),
6001 (28, is_funding_locked, required),
6002 (30, is_usable, required),
6003 (32, is_public, required),
6004 (33, inbound_htlc_minimum_msat, option),
6005 (35, inbound_htlc_maximum_msat, option),
6008 impl_writeable_tlv_based!(PhantomRouteHints, {
6009 (2, channels, vec_type),
6010 (4, phantom_scid, required),
6011 (6, real_node_pubkey, required),
6014 impl_writeable_tlv_based_enum!(PendingHTLCRouting,
6016 (0, onion_packet, required),
6017 (2, short_channel_id, required),
6020 (0, payment_data, required),
6021 (1, phantom_shared_secret, option),
6022 (2, incoming_cltv_expiry, required),
6024 (2, ReceiveKeysend) => {
6025 (0, payment_preimage, required),
6026 (2, incoming_cltv_expiry, required),
6030 impl_writeable_tlv_based!(PendingHTLCInfo, {
6031 (0, routing, required),
6032 (2, incoming_shared_secret, required),
6033 (4, payment_hash, required),
6034 (6, amt_to_forward, required),
6035 (8, outgoing_cltv_value, required)
6039 impl Writeable for HTLCFailureMsg {
6040 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
6042 HTLCFailureMsg::Relay(msgs::UpdateFailHTLC { channel_id, htlc_id, reason }) => {
6044 channel_id.write(writer)?;
6045 htlc_id.write(writer)?;
6046 reason.write(writer)?;
6048 HTLCFailureMsg::Malformed(msgs::UpdateFailMalformedHTLC {
6049 channel_id, htlc_id, sha256_of_onion, failure_code
6052 channel_id.write(writer)?;
6053 htlc_id.write(writer)?;
6054 sha256_of_onion.write(writer)?;
6055 failure_code.write(writer)?;
6062 impl Readable for HTLCFailureMsg {
6063 fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
6064 let id: u8 = Readable::read(reader)?;
6067 Ok(HTLCFailureMsg::Relay(msgs::UpdateFailHTLC {
6068 channel_id: Readable::read(reader)?,
6069 htlc_id: Readable::read(reader)?,
6070 reason: Readable::read(reader)?,
6074 Ok(HTLCFailureMsg::Malformed(msgs::UpdateFailMalformedHTLC {
6075 channel_id: Readable::read(reader)?,
6076 htlc_id: Readable::read(reader)?,
6077 sha256_of_onion: Readable::read(reader)?,
6078 failure_code: Readable::read(reader)?,
6081 // In versions prior to 0.0.101, HTLCFailureMsg objects were written with type 0 or 1 but
6082 // weren't length-prefixed and thus didn't support reading the TLV stream suffix of the network
6083 // messages contained in the variants.
6084 // In version 0.0.101, support for reading the variants with these types was added, and
6085 // we should migrate to writing these variants when UpdateFailHTLC or
6086 // UpdateFailMalformedHTLC get TLV fields.
6088 let length: BigSize = Readable::read(reader)?;
6089 let mut s = FixedLengthReader::new(reader, length.0);
6090 let res = Readable::read(&mut s)?;
6091 s.eat_remaining()?; // Return ShortRead if there's actually not enough bytes
6092 Ok(HTLCFailureMsg::Relay(res))
6095 let length: BigSize = Readable::read(reader)?;
6096 let mut s = FixedLengthReader::new(reader, length.0);
6097 let res = Readable::read(&mut s)?;
6098 s.eat_remaining()?; // Return ShortRead if there's actually not enough bytes
6099 Ok(HTLCFailureMsg::Malformed(res))
6101 _ => Err(DecodeError::UnknownRequiredFeature),
6106 impl_writeable_tlv_based_enum!(PendingHTLCStatus, ;
6111 impl_writeable_tlv_based!(HTLCPreviousHopData, {
6112 (0, short_channel_id, required),
6113 (1, phantom_shared_secret, option),
6114 (2, outpoint, required),
6115 (4, htlc_id, required),
6116 (6, incoming_packet_shared_secret, required)
6119 impl Writeable for ClaimableHTLC {
6120 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
6121 let payment_data = match &self.onion_payload {
6122 OnionPayload::Invoice { _legacy_hop_data } => Some(_legacy_hop_data),
6125 let keysend_preimage = match self.onion_payload {
6126 OnionPayload::Invoice { .. } => None,
6127 OnionPayload::Spontaneous(preimage) => Some(preimage.clone()),
6129 write_tlv_fields!(writer, {
6130 (0, self.prev_hop, required),
6131 (1, self.total_msat, required),
6132 (2, self.value, required),
6133 (4, payment_data, option),
6134 (6, self.cltv_expiry, required),
6135 (8, keysend_preimage, option),
6141 impl Readable for ClaimableHTLC {
6142 fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
6143 let mut prev_hop = ::util::ser::OptionDeserWrapper(None);
6145 let mut payment_data: Option<msgs::FinalOnionHopData> = None;
6146 let mut cltv_expiry = 0;
6147 let mut total_msat = None;
6148 let mut keysend_preimage: Option<PaymentPreimage> = None;
6149 read_tlv_fields!(reader, {
6150 (0, prev_hop, required),
6151 (1, total_msat, option),
6152 (2, value, required),
6153 (4, payment_data, option),
6154 (6, cltv_expiry, required),
6155 (8, keysend_preimage, option)
6157 let onion_payload = match keysend_preimage {
6159 if payment_data.is_some() {
6160 return Err(DecodeError::InvalidValue)
6162 if total_msat.is_none() {
6163 total_msat = Some(value);
6165 OnionPayload::Spontaneous(p)
6168 if payment_data.is_none() {
6169 return Err(DecodeError::InvalidValue)
6171 if total_msat.is_none() {
6172 total_msat = Some(payment_data.as_ref().unwrap().total_msat);
6174 OnionPayload::Invoice { _legacy_hop_data: payment_data.unwrap() }
6178 prev_hop: prev_hop.0.unwrap(),
6181 total_msat: total_msat.unwrap(),
6188 impl Readable for HTLCSource {
6189 fn read<R: Read>(reader: &mut R) -> Result<Self, DecodeError> {
6190 let id: u8 = Readable::read(reader)?;
6193 let mut session_priv: ::util::ser::OptionDeserWrapper<SecretKey> = ::util::ser::OptionDeserWrapper(None);
6194 let mut first_hop_htlc_msat: u64 = 0;
6195 let mut path = Some(Vec::new());
6196 let mut payment_id = None;
6197 let mut payment_secret = None;
6198 let mut payment_params = None;
6199 read_tlv_fields!(reader, {
6200 (0, session_priv, required),
6201 (1, payment_id, option),
6202 (2, first_hop_htlc_msat, required),
6203 (3, payment_secret, option),
6204 (4, path, vec_type),
6205 (5, payment_params, option),
6207 if payment_id.is_none() {
6208 // For backwards compat, if there was no payment_id written, use the session_priv bytes
6210 payment_id = Some(PaymentId(*session_priv.0.unwrap().as_ref()));
6212 Ok(HTLCSource::OutboundRoute {
6213 session_priv: session_priv.0.unwrap(),
6214 first_hop_htlc_msat: first_hop_htlc_msat,
6215 path: path.unwrap(),
6216 payment_id: payment_id.unwrap(),
6221 1 => Ok(HTLCSource::PreviousHopData(Readable::read(reader)?)),
6222 _ => Err(DecodeError::UnknownRequiredFeature),
6227 impl Writeable for HTLCSource {
6228 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::io::Error> {
6230 HTLCSource::OutboundRoute { ref session_priv, ref first_hop_htlc_msat, ref path, payment_id, payment_secret, payment_params } => {
6232 let payment_id_opt = Some(payment_id);
6233 write_tlv_fields!(writer, {
6234 (0, session_priv, required),
6235 (1, payment_id_opt, option),
6236 (2, first_hop_htlc_msat, required),
6237 (3, payment_secret, option),
6238 (4, path, vec_type),
6239 (5, payment_params, option),
6242 HTLCSource::PreviousHopData(ref field) => {
6244 field.write(writer)?;
6251 impl_writeable_tlv_based_enum!(HTLCFailReason,
6252 (0, LightningError) => {
6256 (0, failure_code, required),
6257 (2, data, vec_type),
6261 impl_writeable_tlv_based_enum!(HTLCForwardInfo,
6263 (0, forward_info, required),
6264 (2, prev_short_channel_id, required),
6265 (4, prev_htlc_id, required),
6266 (6, prev_funding_outpoint, required),
6269 (0, htlc_id, required),
6270 (2, err_packet, required),
6274 impl_writeable_tlv_based!(PendingInboundPayment, {
6275 (0, payment_secret, required),
6276 (2, expiry_time, required),
6277 (4, user_payment_id, required),
6278 (6, payment_preimage, required),
6279 (8, min_value_msat, required),
6282 impl_writeable_tlv_based_enum_upgradable!(PendingOutboundPayment,
6284 (0, session_privs, required),
6287 (0, session_privs, required),
6288 (1, payment_hash, option),
6291 (0, session_privs, required),
6292 (1, pending_fee_msat, option),
6293 (2, payment_hash, required),
6294 (4, payment_secret, option),
6295 (6, total_msat, required),
6296 (8, pending_amt_msat, required),
6297 (10, starting_block_height, required),
6300 (0, session_privs, required),
6301 (2, payment_hash, required),
6305 impl<Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref> Writeable for ChannelManager<Signer, M, T, K, F, L>
6306 where M::Target: chain::Watch<Signer>,
6307 T::Target: BroadcasterInterface,
6308 K::Target: KeysInterface<Signer = Signer>,
6309 F::Target: FeeEstimator,
6312 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
6313 let _consistency_lock = self.total_consistency_lock.write().unwrap();
6315 write_ver_prefix!(writer, SERIALIZATION_VERSION, MIN_SERIALIZATION_VERSION);
6317 self.genesis_hash.write(writer)?;
6319 let best_block = self.best_block.read().unwrap();
6320 best_block.height().write(writer)?;
6321 best_block.block_hash().write(writer)?;
6324 let channel_state = self.channel_state.lock().unwrap();
6325 let mut unfunded_channels = 0;
6326 for (_, channel) in channel_state.by_id.iter() {
6327 if !channel.is_funding_initiated() {
6328 unfunded_channels += 1;
6331 ((channel_state.by_id.len() - unfunded_channels) as u64).write(writer)?;
6332 for (_, channel) in channel_state.by_id.iter() {
6333 if channel.is_funding_initiated() {
6334 channel.write(writer)?;
6338 (channel_state.forward_htlcs.len() as u64).write(writer)?;
6339 for (short_channel_id, pending_forwards) in channel_state.forward_htlcs.iter() {
6340 short_channel_id.write(writer)?;
6341 (pending_forwards.len() as u64).write(writer)?;
6342 for forward in pending_forwards {
6343 forward.write(writer)?;
6347 (channel_state.claimable_htlcs.len() as u64).write(writer)?;
6348 for (payment_hash, previous_hops) in channel_state.claimable_htlcs.iter() {
6349 payment_hash.write(writer)?;
6350 (previous_hops.len() as u64).write(writer)?;
6351 for htlc in previous_hops.iter() {
6352 htlc.write(writer)?;
6356 let per_peer_state = self.per_peer_state.write().unwrap();
6357 (per_peer_state.len() as u64).write(writer)?;
6358 for (peer_pubkey, peer_state_mutex) in per_peer_state.iter() {
6359 peer_pubkey.write(writer)?;
6360 let peer_state = peer_state_mutex.lock().unwrap();
6361 peer_state.latest_features.write(writer)?;
6364 let pending_inbound_payments = self.pending_inbound_payments.lock().unwrap();
6365 let pending_outbound_payments = self.pending_outbound_payments.lock().unwrap();
6366 let events = self.pending_events.lock().unwrap();
6367 (events.len() as u64).write(writer)?;
6368 for event in events.iter() {
6369 event.write(writer)?;
6372 let background_events = self.pending_background_events.lock().unwrap();
6373 (background_events.len() as u64).write(writer)?;
6374 for event in background_events.iter() {
6376 BackgroundEvent::ClosingMonitorUpdate((funding_txo, monitor_update)) => {
6378 funding_txo.write(writer)?;
6379 monitor_update.write(writer)?;
6384 (self.last_node_announcement_serial.load(Ordering::Acquire) as u32).write(writer)?;
6385 (self.highest_seen_timestamp.load(Ordering::Acquire) as u32).write(writer)?;
6387 (pending_inbound_payments.len() as u64).write(writer)?;
6388 for (hash, pending_payment) in pending_inbound_payments.iter() {
6389 hash.write(writer)?;
6390 pending_payment.write(writer)?;
6393 // For backwards compat, write the session privs and their total length.
6394 let mut num_pending_outbounds_compat: u64 = 0;
6395 for (_, outbound) in pending_outbound_payments.iter() {
6396 if !outbound.is_fulfilled() && !outbound.abandoned() {
6397 num_pending_outbounds_compat += outbound.remaining_parts() as u64;
6400 num_pending_outbounds_compat.write(writer)?;
6401 for (_, outbound) in pending_outbound_payments.iter() {
6403 PendingOutboundPayment::Legacy { session_privs } |
6404 PendingOutboundPayment::Retryable { session_privs, .. } => {
6405 for session_priv in session_privs.iter() {
6406 session_priv.write(writer)?;
6409 PendingOutboundPayment::Fulfilled { .. } => {},
6410 PendingOutboundPayment::Abandoned { .. } => {},
6414 // Encode without retry info for 0.0.101 compatibility.
6415 let mut pending_outbound_payments_no_retry: HashMap<PaymentId, HashSet<[u8; 32]>> = HashMap::new();
6416 for (id, outbound) in pending_outbound_payments.iter() {
6418 PendingOutboundPayment::Legacy { session_privs } |
6419 PendingOutboundPayment::Retryable { session_privs, .. } => {
6420 pending_outbound_payments_no_retry.insert(*id, session_privs.clone());
6425 write_tlv_fields!(writer, {
6426 (1, pending_outbound_payments_no_retry, required),
6427 (3, pending_outbound_payments, required),
6428 (5, self.our_network_pubkey, required),
6429 (7, self.fake_scid_rand_bytes, required),
6436 /// Arguments for the creation of a ChannelManager that are not deserialized.
6438 /// At a high-level, the process for deserializing a ChannelManager and resuming normal operation
6440 /// 1) Deserialize all stored [`ChannelMonitor`]s.
6441 /// 2) Deserialize the [`ChannelManager`] by filling in this struct and calling:
6442 /// `<(BlockHash, ChannelManager)>::read(reader, args)`
6443 /// This may result in closing some channels if the [`ChannelMonitor`] is newer than the stored
6444 /// [`ChannelManager`] state to ensure no loss of funds. Thus, transactions may be broadcasted.
6445 /// 3) If you are not fetching full blocks, register all relevant [`ChannelMonitor`] outpoints the
6446 /// same way you would handle a [`chain::Filter`] call using
6447 /// [`ChannelMonitor::get_outputs_to_watch`] and [`ChannelMonitor::get_funding_txo`].
6448 /// 4) Reconnect blocks on your [`ChannelMonitor`]s.
6449 /// 5) Disconnect/connect blocks on the [`ChannelManager`].
6450 /// 6) Re-persist the [`ChannelMonitor`]s to ensure the latest state is on disk.
6451 /// Note that if you're using a [`ChainMonitor`] for your [`chain::Watch`] implementation, you
6452 /// will likely accomplish this as a side-effect of calling [`chain::Watch::watch_channel`] in
6454 /// 7) Move the [`ChannelMonitor`]s into your local [`chain::Watch`]. If you're using a
6455 /// [`ChainMonitor`], this is done by calling [`chain::Watch::watch_channel`].
6457 /// Note that the ordering of #4-7 is not of importance, however all four must occur before you
6458 /// call any other methods on the newly-deserialized [`ChannelManager`].
6460 /// Note that because some channels may be closed during deserialization, it is critical that you
6461 /// always deserialize only the latest version of a ChannelManager and ChannelMonitors available to
6462 /// you. If you deserialize an old ChannelManager (during which force-closure transactions may be
6463 /// broadcast), and then later deserialize a newer version of the same ChannelManager (which will
6464 /// not force-close the same channels but consider them live), you may end up revoking a state for
6465 /// which you've already broadcasted the transaction.
6467 /// [`ChainMonitor`]: crate::chain::chainmonitor::ChainMonitor
6468 pub struct ChannelManagerReadArgs<'a, Signer: 'a + Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
6469 where M::Target: chain::Watch<Signer>,
6470 T::Target: BroadcasterInterface,
6471 K::Target: KeysInterface<Signer = Signer>,
6472 F::Target: FeeEstimator,
6475 /// The keys provider which will give us relevant keys. Some keys will be loaded during
6476 /// deserialization and KeysInterface::read_chan_signer will be used to read per-Channel
6478 pub keys_manager: K,
6480 /// The fee_estimator for use in the ChannelManager in the future.
6482 /// No calls to the FeeEstimator will be made during deserialization.
6483 pub fee_estimator: F,
6484 /// The chain::Watch for use in the ChannelManager in the future.
6486 /// No calls to the chain::Watch will be made during deserialization. It is assumed that
6487 /// you have deserialized ChannelMonitors separately and will add them to your
6488 /// chain::Watch after deserializing this ChannelManager.
6489 pub chain_monitor: M,
6491 /// The BroadcasterInterface which will be used in the ChannelManager in the future and may be
6492 /// used to broadcast the latest local commitment transactions of channels which must be
6493 /// force-closed during deserialization.
6494 pub tx_broadcaster: T,
6495 /// The Logger for use in the ChannelManager and which may be used to log information during
6496 /// deserialization.
6498 /// Default settings used for new channels. Any existing channels will continue to use the
6499 /// runtime settings which were stored when the ChannelManager was serialized.
6500 pub default_config: UserConfig,
6502 /// A map from channel funding outpoints to ChannelMonitors for those channels (ie
6503 /// value.get_funding_txo() should be the key).
6505 /// If a monitor is inconsistent with the channel state during deserialization the channel will
6506 /// be force-closed using the data in the ChannelMonitor and the channel will be dropped. This
6507 /// is true for missing channels as well. If there is a monitor missing for which we find
6508 /// channel data Err(DecodeError::InvalidValue) will be returned.
6510 /// In such cases the latest local transactions will be sent to the tx_broadcaster included in
6513 /// (C-not exported) because we have no HashMap bindings
6514 pub channel_monitors: HashMap<OutPoint, &'a mut ChannelMonitor<Signer>>,
6517 impl<'a, Signer: 'a + Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
6518 ChannelManagerReadArgs<'a, Signer, M, T, K, F, L>
6519 where M::Target: chain::Watch<Signer>,
6520 T::Target: BroadcasterInterface,
6521 K::Target: KeysInterface<Signer = Signer>,
6522 F::Target: FeeEstimator,
6525 /// Simple utility function to create a ChannelManagerReadArgs which creates the monitor
6526 /// HashMap for you. This is primarily useful for C bindings where it is not practical to
6527 /// populate a HashMap directly from C.
6528 pub fn new(keys_manager: K, fee_estimator: F, chain_monitor: M, tx_broadcaster: T, logger: L, default_config: UserConfig,
6529 mut channel_monitors: Vec<&'a mut ChannelMonitor<Signer>>) -> Self {
6531 keys_manager, fee_estimator, chain_monitor, tx_broadcaster, logger, default_config,
6532 channel_monitors: channel_monitors.drain(..).map(|monitor| { (monitor.get_funding_txo().0, monitor) }).collect()
6537 // Implement ReadableArgs for an Arc'd ChannelManager to make it a bit easier to work with the
6538 // SipmleArcChannelManager type:
6539 impl<'a, Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
6540 ReadableArgs<ChannelManagerReadArgs<'a, Signer, M, T, K, F, L>> for (BlockHash, Arc<ChannelManager<Signer, M, T, K, F, L>>)
6541 where M::Target: chain::Watch<Signer>,
6542 T::Target: BroadcasterInterface,
6543 K::Target: KeysInterface<Signer = Signer>,
6544 F::Target: FeeEstimator,
6547 fn read<R: io::Read>(reader: &mut R, args: ChannelManagerReadArgs<'a, Signer, M, T, K, F, L>) -> Result<Self, DecodeError> {
6548 let (blockhash, chan_manager) = <(BlockHash, ChannelManager<Signer, M, T, K, F, L>)>::read(reader, args)?;
6549 Ok((blockhash, Arc::new(chan_manager)))
6553 impl<'a, Signer: Sign, M: Deref, T: Deref, K: Deref, F: Deref, L: Deref>
6554 ReadableArgs<ChannelManagerReadArgs<'a, Signer, M, T, K, F, L>> for (BlockHash, ChannelManager<Signer, M, T, K, F, L>)
6555 where M::Target: chain::Watch<Signer>,
6556 T::Target: BroadcasterInterface,
6557 K::Target: KeysInterface<Signer = Signer>,
6558 F::Target: FeeEstimator,
6561 fn read<R: io::Read>(reader: &mut R, mut args: ChannelManagerReadArgs<'a, Signer, M, T, K, F, L>) -> Result<Self, DecodeError> {
6562 let _ver = read_ver_prefix!(reader, SERIALIZATION_VERSION);
6564 let genesis_hash: BlockHash = Readable::read(reader)?;
6565 let best_block_height: u32 = Readable::read(reader)?;
6566 let best_block_hash: BlockHash = Readable::read(reader)?;
6568 let mut failed_htlcs = Vec::new();
6570 let channel_count: u64 = Readable::read(reader)?;
6571 let mut funding_txo_set = HashSet::with_capacity(cmp::min(channel_count as usize, 128));
6572 let mut by_id = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
6573 let mut short_to_id = HashMap::with_capacity(cmp::min(channel_count as usize, 128));
6574 let mut channel_closures = Vec::new();
6575 for _ in 0..channel_count {
6576 let mut channel: Channel<Signer> = Channel::read(reader, (&args.keys_manager, best_block_height))?;
6577 let funding_txo = channel.get_funding_txo().ok_or(DecodeError::InvalidValue)?;
6578 funding_txo_set.insert(funding_txo.clone());
6579 if let Some(ref mut monitor) = args.channel_monitors.get_mut(&funding_txo) {
6580 if channel.get_cur_holder_commitment_transaction_number() < monitor.get_cur_holder_commitment_number() ||
6581 channel.get_revoked_counterparty_commitment_transaction_number() < monitor.get_min_seen_secret() ||
6582 channel.get_cur_counterparty_commitment_transaction_number() < monitor.get_cur_counterparty_commitment_number() ||
6583 channel.get_latest_monitor_update_id() > monitor.get_latest_update_id() {
6584 // If the channel is ahead of the monitor, return InvalidValue:
6585 log_error!(args.logger, "A ChannelMonitor is stale compared to the current ChannelManager! This indicates a potentially-critical violation of the chain::Watch API!");
6586 log_error!(args.logger, " The ChannelMonitor for channel {} is at update_id {} but the ChannelManager is at update_id {}.",
6587 log_bytes!(channel.channel_id()), monitor.get_latest_update_id(), channel.get_latest_monitor_update_id());
6588 log_error!(args.logger, " The chain::Watch API *requires* that monitors are persisted durably before returning,");
6589 log_error!(args.logger, " client applications must ensure that ChannelMonitor data is always available and the latest to avoid funds loss!");
6590 log_error!(args.logger, " Without the latest ChannelMonitor we cannot continue without risking funds.");
6591 log_error!(args.logger, " Please ensure the chain::Watch API requirements are met and file a bug report at https://github.com/lightningdevkit/rust-lightning");
6592 return Err(DecodeError::InvalidValue);
6593 } else if channel.get_cur_holder_commitment_transaction_number() > monitor.get_cur_holder_commitment_number() ||
6594 channel.get_revoked_counterparty_commitment_transaction_number() > monitor.get_min_seen_secret() ||
6595 channel.get_cur_counterparty_commitment_transaction_number() > monitor.get_cur_counterparty_commitment_number() ||
6596 channel.get_latest_monitor_update_id() < monitor.get_latest_update_id() {
6597 // But if the channel is behind of the monitor, close the channel:
6598 log_error!(args.logger, "A ChannelManager is stale compared to the current ChannelMonitor!");
6599 log_error!(args.logger, " The channel will be force-closed and the latest commitment transaction from the ChannelMonitor broadcast.");
6600 log_error!(args.logger, " The ChannelMonitor for channel {} is at update_id {} but the ChannelManager is at update_id {}.",
6601 log_bytes!(channel.channel_id()), monitor.get_latest_update_id(), channel.get_latest_monitor_update_id());
6602 let (_, mut new_failed_htlcs) = channel.force_shutdown(true);
6603 failed_htlcs.append(&mut new_failed_htlcs);
6604 monitor.broadcast_latest_holder_commitment_txn(&args.tx_broadcaster, &args.logger);
6605 channel_closures.push(events::Event::ChannelClosed {
6606 channel_id: channel.channel_id(),
6607 user_channel_id: channel.get_user_id(),
6608 reason: ClosureReason::OutdatedChannelManager
6611 log_info!(args.logger, "Successfully loaded channel {}", log_bytes!(channel.channel_id()));
6612 if let Some(short_channel_id) = channel.get_short_channel_id() {
6613 short_to_id.insert(short_channel_id, channel.channel_id());
6615 by_id.insert(channel.channel_id(), channel);
6618 log_error!(args.logger, "Missing ChannelMonitor for channel {} needed by ChannelManager.", log_bytes!(channel.channel_id()));
6619 log_error!(args.logger, " The chain::Watch API *requires* that monitors are persisted durably before returning,");
6620 log_error!(args.logger, " client applications must ensure that ChannelMonitor data is always available and the latest to avoid funds loss!");
6621 log_error!(args.logger, " Without the ChannelMonitor we cannot continue without risking funds.");
6622 log_error!(args.logger, " Please ensure the chain::Watch API requirements are met and file a bug report at https://github.com/lightningdevkit/rust-lightning");
6623 return Err(DecodeError::InvalidValue);
6627 for (ref funding_txo, ref mut monitor) in args.channel_monitors.iter_mut() {
6628 if !funding_txo_set.contains(funding_txo) {
6629 log_info!(args.logger, "Broadcasting latest holder commitment transaction for closed channel {}", log_bytes!(funding_txo.to_channel_id()));
6630 monitor.broadcast_latest_holder_commitment_txn(&args.tx_broadcaster, &args.logger);
6634 const MAX_ALLOC_SIZE: usize = 1024 * 64;
6635 let forward_htlcs_count: u64 = Readable::read(reader)?;
6636 let mut forward_htlcs = HashMap::with_capacity(cmp::min(forward_htlcs_count as usize, 128));
6637 for _ in 0..forward_htlcs_count {
6638 let short_channel_id = Readable::read(reader)?;
6639 let pending_forwards_count: u64 = Readable::read(reader)?;
6640 let mut pending_forwards = Vec::with_capacity(cmp::min(pending_forwards_count as usize, MAX_ALLOC_SIZE/mem::size_of::<HTLCForwardInfo>()));
6641 for _ in 0..pending_forwards_count {
6642 pending_forwards.push(Readable::read(reader)?);
6644 forward_htlcs.insert(short_channel_id, pending_forwards);
6647 let claimable_htlcs_count: u64 = Readable::read(reader)?;
6648 let mut claimable_htlcs = HashMap::with_capacity(cmp::min(claimable_htlcs_count as usize, 128));
6649 for _ in 0..claimable_htlcs_count {
6650 let payment_hash = Readable::read(reader)?;
6651 let previous_hops_len: u64 = Readable::read(reader)?;
6652 let mut previous_hops = Vec::with_capacity(cmp::min(previous_hops_len as usize, MAX_ALLOC_SIZE/mem::size_of::<ClaimableHTLC>()));
6653 for _ in 0..previous_hops_len {
6654 previous_hops.push(Readable::read(reader)?);
6656 claimable_htlcs.insert(payment_hash, previous_hops);
6659 let peer_count: u64 = Readable::read(reader)?;
6660 let mut per_peer_state = HashMap::with_capacity(cmp::min(peer_count as usize, MAX_ALLOC_SIZE/mem::size_of::<(PublicKey, Mutex<PeerState>)>()));
6661 for _ in 0..peer_count {
6662 let peer_pubkey = Readable::read(reader)?;
6663 let peer_state = PeerState {
6664 latest_features: Readable::read(reader)?,
6666 per_peer_state.insert(peer_pubkey, Mutex::new(peer_state));
6669 let event_count: u64 = Readable::read(reader)?;
6670 let mut pending_events_read: Vec<events::Event> = Vec::with_capacity(cmp::min(event_count as usize, MAX_ALLOC_SIZE/mem::size_of::<events::Event>()));
6671 for _ in 0..event_count {
6672 match MaybeReadable::read(reader)? {
6673 Some(event) => pending_events_read.push(event),
6677 if forward_htlcs_count > 0 {
6678 // If we have pending HTLCs to forward, assume we either dropped a
6679 // `PendingHTLCsForwardable` or the user received it but never processed it as they
6680 // shut down before the timer hit. Either way, set the time_forwardable to a small
6681 // constant as enough time has likely passed that we should simply handle the forwards
6682 // now, or at least after the user gets a chance to reconnect to our peers.
6683 pending_events_read.push(events::Event::PendingHTLCsForwardable {
6684 time_forwardable: Duration::from_secs(2),
6688 let background_event_count: u64 = Readable::read(reader)?;
6689 let mut pending_background_events_read: Vec<BackgroundEvent> = Vec::with_capacity(cmp::min(background_event_count as usize, MAX_ALLOC_SIZE/mem::size_of::<BackgroundEvent>()));
6690 for _ in 0..background_event_count {
6691 match <u8 as Readable>::read(reader)? {
6692 0 => pending_background_events_read.push(BackgroundEvent::ClosingMonitorUpdate((Readable::read(reader)?, Readable::read(reader)?))),
6693 _ => return Err(DecodeError::InvalidValue),
6697 let last_node_announcement_serial: u32 = Readable::read(reader)?;
6698 let highest_seen_timestamp: u32 = Readable::read(reader)?;
6700 let pending_inbound_payment_count: u64 = Readable::read(reader)?;
6701 let mut pending_inbound_payments: HashMap<PaymentHash, PendingInboundPayment> = HashMap::with_capacity(cmp::min(pending_inbound_payment_count as usize, MAX_ALLOC_SIZE/(3*32)));
6702 for _ in 0..pending_inbound_payment_count {
6703 if pending_inbound_payments.insert(Readable::read(reader)?, Readable::read(reader)?).is_some() {
6704 return Err(DecodeError::InvalidValue);
6708 let pending_outbound_payments_count_compat: u64 = Readable::read(reader)?;
6709 let mut pending_outbound_payments_compat: HashMap<PaymentId, PendingOutboundPayment> =
6710 HashMap::with_capacity(cmp::min(pending_outbound_payments_count_compat as usize, MAX_ALLOC_SIZE/32));
6711 for _ in 0..pending_outbound_payments_count_compat {
6712 let session_priv = Readable::read(reader)?;
6713 let payment = PendingOutboundPayment::Legacy {
6714 session_privs: [session_priv].iter().cloned().collect()
6716 if pending_outbound_payments_compat.insert(PaymentId(session_priv), payment).is_some() {
6717 return Err(DecodeError::InvalidValue)
6721 // pending_outbound_payments_no_retry is for compatibility with 0.0.101 clients.
6722 let mut pending_outbound_payments_no_retry: Option<HashMap<PaymentId, HashSet<[u8; 32]>>> = None;
6723 let mut pending_outbound_payments = None;
6724 let mut received_network_pubkey: Option<PublicKey> = None;
6725 let mut fake_scid_rand_bytes: Option<[u8; 32]> = None;
6726 read_tlv_fields!(reader, {
6727 (1, pending_outbound_payments_no_retry, option),
6728 (3, pending_outbound_payments, option),
6729 (5, received_network_pubkey, option),
6730 (7, fake_scid_rand_bytes, option),
6732 if fake_scid_rand_bytes.is_none() {
6733 fake_scid_rand_bytes = Some(args.keys_manager.get_secure_random_bytes());
6736 if pending_outbound_payments.is_none() && pending_outbound_payments_no_retry.is_none() {
6737 pending_outbound_payments = Some(pending_outbound_payments_compat);
6738 } else if pending_outbound_payments.is_none() {
6739 let mut outbounds = HashMap::new();
6740 for (id, session_privs) in pending_outbound_payments_no_retry.unwrap().drain() {
6741 outbounds.insert(id, PendingOutboundPayment::Legacy { session_privs });
6743 pending_outbound_payments = Some(outbounds);
6745 // If we're tracking pending payments, ensure we haven't lost any by looking at the
6746 // ChannelMonitor data for any channels for which we do not have authorative state
6747 // (i.e. those for which we just force-closed above or we otherwise don't have a
6748 // corresponding `Channel` at all).
6749 // This avoids several edge-cases where we would otherwise "forget" about pending
6750 // payments which are still in-flight via their on-chain state.
6751 // We only rebuild the pending payments map if we were most recently serialized by
6753 for (_, monitor) in args.channel_monitors {
6754 if by_id.get(&monitor.get_funding_txo().0.to_channel_id()).is_none() {
6755 for (htlc_source, htlc) in monitor.get_pending_outbound_htlcs() {
6756 if let HTLCSource::OutboundRoute { payment_id, session_priv, path, payment_secret, .. } = htlc_source {
6757 if path.is_empty() {
6758 log_error!(args.logger, "Got an empty path for a pending payment");
6759 return Err(DecodeError::InvalidValue);
6761 let path_amt = path.last().unwrap().fee_msat;
6762 let mut session_priv_bytes = [0; 32];
6763 session_priv_bytes[..].copy_from_slice(&session_priv[..]);
6764 match pending_outbound_payments.as_mut().unwrap().entry(payment_id) {
6765 hash_map::Entry::Occupied(mut entry) => {
6766 let newly_added = entry.get_mut().insert(session_priv_bytes, &path);
6767 log_info!(args.logger, "{} a pending payment path for {} msat for session priv {} on an existing pending payment with payment hash {}",
6768 if newly_added { "Added" } else { "Had" }, path_amt, log_bytes!(session_priv_bytes), log_bytes!(htlc.payment_hash.0));
6770 hash_map::Entry::Vacant(entry) => {
6771 let path_fee = path.get_path_fees();
6772 entry.insert(PendingOutboundPayment::Retryable {
6773 session_privs: [session_priv_bytes].iter().map(|a| *a).collect(),
6774 payment_hash: htlc.payment_hash,
6776 pending_amt_msat: path_amt,
6777 pending_fee_msat: Some(path_fee),
6778 total_msat: path_amt,
6779 starting_block_height: best_block_height,
6781 log_info!(args.logger, "Added a pending payment for {} msat with payment hash {} for path with session priv {}",
6782 path_amt, log_bytes!(htlc.payment_hash.0), log_bytes!(session_priv_bytes));
6791 let mut secp_ctx = Secp256k1::new();
6792 secp_ctx.seeded_randomize(&args.keys_manager.get_secure_random_bytes());
6794 if !channel_closures.is_empty() {
6795 pending_events_read.append(&mut channel_closures);
6798 let our_network_key = match args.keys_manager.get_node_secret(Recipient::Node) {
6800 Err(()) => return Err(DecodeError::InvalidValue)
6802 let our_network_pubkey = PublicKey::from_secret_key(&secp_ctx, &our_network_key);
6803 if let Some(network_pubkey) = received_network_pubkey {
6804 if network_pubkey != our_network_pubkey {
6805 log_error!(args.logger, "Key that was generated does not match the existing key.");
6806 return Err(DecodeError::InvalidValue);
6810 let mut outbound_scid_aliases = HashSet::new();
6811 for (chan_id, chan) in by_id.iter_mut() {
6812 if chan.outbound_scid_alias() == 0 {
6813 let mut outbound_scid_alias;
6815 outbound_scid_alias = fake_scid::Namespace::OutboundAlias
6816 .get_fake_scid(best_block_height, &genesis_hash, fake_scid_rand_bytes.as_ref().unwrap(), &args.keys_manager);
6817 if outbound_scid_aliases.insert(outbound_scid_alias) { break; }
6819 chan.set_outbound_scid_alias(outbound_scid_alias);
6820 } else if !outbound_scid_aliases.insert(chan.outbound_scid_alias()) {
6821 // Note that in rare cases its possible to hit this while reading an older
6822 // channel if we just happened to pick a colliding outbound alias above.
6823 log_error!(args.logger, "Got duplicate outbound SCID alias; {}", chan.outbound_scid_alias());
6824 return Err(DecodeError::InvalidValue);
6826 if chan.is_usable() {
6827 if short_to_id.insert(chan.outbound_scid_alias(), *chan_id).is_some() {
6828 // Note that in rare cases its possible to hit this while reading an older
6829 // channel if we just happened to pick a colliding outbound alias above.
6830 log_error!(args.logger, "Got duplicate outbound SCID alias; {}", chan.outbound_scid_alias());
6831 return Err(DecodeError::InvalidValue);
6836 let inbound_pmt_key_material = args.keys_manager.get_inbound_payment_key_material();
6837 let expanded_inbound_key = inbound_payment::ExpandedKey::new(&inbound_pmt_key_material);
6838 let channel_manager = ChannelManager {
6840 fee_estimator: args.fee_estimator,
6841 chain_monitor: args.chain_monitor,
6842 tx_broadcaster: args.tx_broadcaster,
6844 best_block: RwLock::new(BestBlock::new(best_block_hash, best_block_height)),
6846 channel_state: Mutex::new(ChannelHolder {
6851 pending_msg_events: Vec::new(),
6853 inbound_payment_key: expanded_inbound_key,
6854 pending_inbound_payments: Mutex::new(pending_inbound_payments),
6855 pending_outbound_payments: Mutex::new(pending_outbound_payments.unwrap()),
6857 outbound_scid_aliases: Mutex::new(outbound_scid_aliases),
6858 fake_scid_rand_bytes: fake_scid_rand_bytes.unwrap(),
6864 last_node_announcement_serial: AtomicUsize::new(last_node_announcement_serial as usize),
6865 highest_seen_timestamp: AtomicUsize::new(highest_seen_timestamp as usize),
6867 per_peer_state: RwLock::new(per_peer_state),
6869 pending_events: Mutex::new(pending_events_read),
6870 pending_background_events: Mutex::new(pending_background_events_read),
6871 total_consistency_lock: RwLock::new(()),
6872 persistence_notifier: PersistenceNotifier::new(),
6874 keys_manager: args.keys_manager,
6875 logger: args.logger,
6876 default_configuration: args.default_config,
6879 for htlc_source in failed_htlcs.drain(..) {
6880 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() });
6883 //TODO: Broadcast channel update for closed channels, but only after we've made a
6884 //connection or two.
6886 Ok((best_block_hash.clone(), channel_manager))
6892 use bitcoin::hashes::Hash;
6893 use bitcoin::hashes::sha256::Hash as Sha256;
6894 use core::time::Duration;
6895 use core::sync::atomic::Ordering;
6896 use ln::{PaymentPreimage, PaymentHash, PaymentSecret};
6897 use ln::channelmanager::{PaymentId, PaymentSendFailure};
6898 use ln::channelmanager::inbound_payment;
6899 use ln::features::InitFeatures;
6900 use ln::functional_test_utils::*;
6902 use ln::msgs::ChannelMessageHandler;
6903 use routing::router::{PaymentParameters, RouteParameters, find_route};
6904 use util::errors::APIError;
6905 use util::events::{Event, MessageSendEvent, MessageSendEventsProvider};
6906 use util::test_utils;
6907 use chain::keysinterface::KeysInterface;
6909 #[cfg(feature = "std")]
6911 fn test_wait_timeout() {
6912 use ln::channelmanager::PersistenceNotifier;
6914 use core::sync::atomic::AtomicBool;
6917 let persistence_notifier = Arc::new(PersistenceNotifier::new());
6918 let thread_notifier = Arc::clone(&persistence_notifier);
6920 let exit_thread = Arc::new(AtomicBool::new(false));
6921 let exit_thread_clone = exit_thread.clone();
6922 thread::spawn(move || {
6924 let &(ref persist_mtx, ref cnd) = &thread_notifier.persistence_lock;
6925 let mut persistence_lock = persist_mtx.lock().unwrap();
6926 *persistence_lock = true;
6929 if exit_thread_clone.load(Ordering::SeqCst) {
6935 // Check that we can block indefinitely until updates are available.
6936 let _ = persistence_notifier.wait();
6938 // Check that the PersistenceNotifier will return after the given duration if updates are
6941 if persistence_notifier.wait_timeout(Duration::from_millis(100)) {
6946 exit_thread.store(true, Ordering::SeqCst);
6948 // Check that the PersistenceNotifier will return after the given duration even if no updates
6951 if !persistence_notifier.wait_timeout(Duration::from_millis(100)) {
6958 fn test_notify_limits() {
6959 // Check that a few cases which don't require the persistence of a new ChannelManager,
6960 // indeed, do not cause the persistence of a new ChannelManager.
6961 let chanmon_cfgs = create_chanmon_cfgs(3);
6962 let node_cfgs = create_node_cfgs(3, &chanmon_cfgs);
6963 let node_chanmgrs = create_node_chanmgrs(3, &node_cfgs, &[None, None, None]);
6964 let nodes = create_network(3, &node_cfgs, &node_chanmgrs);
6966 // All nodes start with a persistable update pending as `create_network` connects each node
6967 // with all other nodes to make most tests simpler.
6968 assert!(nodes[0].node.await_persistable_update_timeout(Duration::from_millis(1)));
6969 assert!(nodes[1].node.await_persistable_update_timeout(Duration::from_millis(1)));
6970 assert!(nodes[2].node.await_persistable_update_timeout(Duration::from_millis(1)));
6972 let mut chan = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
6974 // We check that the channel info nodes have doesn't change too early, even though we try
6975 // to connect messages with new values
6976 chan.0.contents.fee_base_msat *= 2;
6977 chan.1.contents.fee_base_msat *= 2;
6978 let node_a_chan_info = nodes[0].node.list_channels()[0].clone();
6979 let node_b_chan_info = nodes[1].node.list_channels()[0].clone();
6981 // The first two nodes (which opened a channel) should now require fresh persistence
6982 assert!(nodes[0].node.await_persistable_update_timeout(Duration::from_millis(1)));
6983 assert!(nodes[1].node.await_persistable_update_timeout(Duration::from_millis(1)));
6984 // ... but the last node should not.
6985 assert!(!nodes[2].node.await_persistable_update_timeout(Duration::from_millis(1)));
6986 // After persisting the first two nodes they should no longer need fresh persistence.
6987 assert!(!nodes[0].node.await_persistable_update_timeout(Duration::from_millis(1)));
6988 assert!(!nodes[1].node.await_persistable_update_timeout(Duration::from_millis(1)));
6990 // Node 3, unrelated to the only channel, shouldn't care if it receives a channel_update
6991 // about the channel.
6992 nodes[2].node.handle_channel_update(&nodes[1].node.get_our_node_id(), &chan.0);
6993 nodes[2].node.handle_channel_update(&nodes[1].node.get_our_node_id(), &chan.1);
6994 assert!(!nodes[2].node.await_persistable_update_timeout(Duration::from_millis(1)));
6996 // The nodes which are a party to the channel should also ignore messages from unrelated
6998 nodes[0].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan.0);
6999 nodes[0].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan.1);
7000 nodes[1].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan.0);
7001 nodes[1].node.handle_channel_update(&nodes[2].node.get_our_node_id(), &chan.1);
7002 assert!(!nodes[0].node.await_persistable_update_timeout(Duration::from_millis(1)));
7003 assert!(!nodes[1].node.await_persistable_update_timeout(Duration::from_millis(1)));
7005 // At this point the channel info given by peers should still be the same.
7006 assert_eq!(nodes[0].node.list_channels()[0], node_a_chan_info);
7007 assert_eq!(nodes[1].node.list_channels()[0], node_b_chan_info);
7009 // An earlier version of handle_channel_update didn't check the directionality of the
7010 // update message and would always update the local fee info, even if our peer was
7011 // (spuriously) forwarding us our own channel_update.
7012 let as_node_one = nodes[0].node.get_our_node_id().serialize()[..] < nodes[1].node.get_our_node_id().serialize()[..];
7013 let as_update = if as_node_one == (chan.0.contents.flags & 1 == 0 /* chan.0 is from node one */) { &chan.0 } else { &chan.1 };
7014 let bs_update = if as_node_one == (chan.0.contents.flags & 1 == 0 /* chan.0 is from node one */) { &chan.1 } else { &chan.0 };
7016 // First deliver each peers' own message, checking that the node doesn't need to be
7017 // persisted and that its channel info remains the same.
7018 nodes[0].node.handle_channel_update(&nodes[1].node.get_our_node_id(), &as_update);
7019 nodes[1].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &bs_update);
7020 assert!(!nodes[0].node.await_persistable_update_timeout(Duration::from_millis(1)));
7021 assert!(!nodes[1].node.await_persistable_update_timeout(Duration::from_millis(1)));
7022 assert_eq!(nodes[0].node.list_channels()[0], node_a_chan_info);
7023 assert_eq!(nodes[1].node.list_channels()[0], node_b_chan_info);
7025 // Finally, deliver the other peers' message, ensuring each node needs to be persisted and
7026 // the channel info has updated.
7027 nodes[0].node.handle_channel_update(&nodes[1].node.get_our_node_id(), &bs_update);
7028 nodes[1].node.handle_channel_update(&nodes[0].node.get_our_node_id(), &as_update);
7029 assert!(nodes[0].node.await_persistable_update_timeout(Duration::from_millis(1)));
7030 assert!(nodes[1].node.await_persistable_update_timeout(Duration::from_millis(1)));
7031 assert_ne!(nodes[0].node.list_channels()[0], node_a_chan_info);
7032 assert_ne!(nodes[1].node.list_channels()[0], node_b_chan_info);
7036 fn test_keysend_dup_hash_partial_mpp() {
7037 // Test that a keysend payment with a duplicate hash to an existing partial MPP payment fails as
7039 let chanmon_cfgs = create_chanmon_cfgs(2);
7040 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7041 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
7042 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7043 create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
7045 // First, send a partial MPP payment.
7046 let (route, our_payment_hash, payment_preimage, payment_secret) = get_route_and_payment_hash!(&nodes[0], nodes[1], 100_000);
7047 let payment_id = PaymentId([42; 32]);
7048 // Use the utility function send_payment_along_path to send the payment with MPP data which
7049 // indicates there are more HTLCs coming.
7050 let cur_height = CHAN_CONFIRM_DEPTH + 1; // route_payment calls send_payment, which adds 1 to the current height. So we do the same here to match.
7051 nodes[0].node.send_payment_along_path(&route.paths[0], &route.payment_params, &our_payment_hash, &Some(payment_secret), 200_000, cur_height, payment_id, &None).unwrap();
7052 check_added_monitors!(nodes[0], 1);
7053 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
7054 assert_eq!(events.len(), 1);
7055 pass_along_path(&nodes[0], &[&nodes[1]], 200_000, our_payment_hash, Some(payment_secret), events.drain(..).next().unwrap(), false, None);
7057 // Next, send a keysend payment with the same payment_hash and make sure it fails.
7058 nodes[0].node.send_spontaneous_payment(&route, Some(payment_preimage)).unwrap();
7059 check_added_monitors!(nodes[0], 1);
7060 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
7061 assert_eq!(events.len(), 1);
7062 let ev = events.drain(..).next().unwrap();
7063 let payment_event = SendEvent::from_event(ev);
7064 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
7065 check_added_monitors!(nodes[1], 0);
7066 commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
7067 expect_pending_htlcs_forwardable!(nodes[1]);
7068 expect_pending_htlcs_forwardable!(nodes[1]);
7069 check_added_monitors!(nodes[1], 1);
7070 let updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
7071 assert!(updates.update_add_htlcs.is_empty());
7072 assert!(updates.update_fulfill_htlcs.is_empty());
7073 assert_eq!(updates.update_fail_htlcs.len(), 1);
7074 assert!(updates.update_fail_malformed_htlcs.is_empty());
7075 assert!(updates.update_fee.is_none());
7076 nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &updates.update_fail_htlcs[0]);
7077 commitment_signed_dance!(nodes[0], nodes[1], updates.commitment_signed, true, true);
7078 expect_payment_failed!(nodes[0], our_payment_hash, true);
7080 // Send the second half of the original MPP payment.
7081 nodes[0].node.send_payment_along_path(&route.paths[0], &route.payment_params, &our_payment_hash, &Some(payment_secret), 200_000, cur_height, payment_id, &None).unwrap();
7082 check_added_monitors!(nodes[0], 1);
7083 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
7084 assert_eq!(events.len(), 1);
7085 pass_along_path(&nodes[0], &[&nodes[1]], 200_000, our_payment_hash, Some(payment_secret), events.drain(..).next().unwrap(), true, None);
7087 // Claim the full MPP payment. Note that we can't use a test utility like
7088 // claim_funds_along_route because the ordering of the messages causes the second half of the
7089 // payment to be put in the holding cell, which confuses the test utilities. So we exchange the
7090 // lightning messages manually.
7091 assert!(nodes[1].node.claim_funds(payment_preimage));
7092 check_added_monitors!(nodes[1], 2);
7093 let bs_first_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
7094 nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &bs_first_updates.update_fulfill_htlcs[0]);
7095 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_first_updates.commitment_signed);
7096 check_added_monitors!(nodes[0], 1);
7097 let (as_first_raa, as_first_cs) = get_revoke_commit_msgs!(nodes[0], nodes[1].node.get_our_node_id());
7098 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_first_raa);
7099 check_added_monitors!(nodes[1], 1);
7100 let bs_second_updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
7101 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_first_cs);
7102 check_added_monitors!(nodes[1], 1);
7103 let bs_first_raa = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
7104 nodes[0].node.handle_update_fulfill_htlc(&nodes[1].node.get_our_node_id(), &bs_second_updates.update_fulfill_htlcs[0]);
7105 nodes[0].node.handle_commitment_signed(&nodes[1].node.get_our_node_id(), &bs_second_updates.commitment_signed);
7106 check_added_monitors!(nodes[0], 1);
7107 let as_second_raa = get_event_msg!(nodes[0], MessageSendEvent::SendRevokeAndACK, nodes[1].node.get_our_node_id());
7108 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_first_raa);
7109 let as_second_updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
7110 check_added_monitors!(nodes[0], 1);
7111 nodes[1].node.handle_revoke_and_ack(&nodes[0].node.get_our_node_id(), &as_second_raa);
7112 check_added_monitors!(nodes[1], 1);
7113 nodes[1].node.handle_commitment_signed(&nodes[0].node.get_our_node_id(), &as_second_updates.commitment_signed);
7114 check_added_monitors!(nodes[1], 1);
7115 let bs_third_raa = get_event_msg!(nodes[1], MessageSendEvent::SendRevokeAndACK, nodes[0].node.get_our_node_id());
7116 nodes[0].node.handle_revoke_and_ack(&nodes[1].node.get_our_node_id(), &bs_third_raa);
7117 check_added_monitors!(nodes[0], 1);
7119 // Note that successful MPP payments will generate a single PaymentSent event upon the first
7120 // path's success and a PaymentPathSuccessful event for each path's success.
7121 let events = nodes[0].node.get_and_clear_pending_events();
7122 assert_eq!(events.len(), 3);
7124 Event::PaymentSent { payment_id: ref id, payment_preimage: ref preimage, payment_hash: ref hash, .. } => {
7125 assert_eq!(Some(payment_id), *id);
7126 assert_eq!(payment_preimage, *preimage);
7127 assert_eq!(our_payment_hash, *hash);
7129 _ => panic!("Unexpected event"),
7132 Event::PaymentPathSuccessful { payment_id: ref actual_payment_id, ref payment_hash, ref path } => {
7133 assert_eq!(payment_id, *actual_payment_id);
7134 assert_eq!(our_payment_hash, *payment_hash.as_ref().unwrap());
7135 assert_eq!(route.paths[0], *path);
7137 _ => panic!("Unexpected event"),
7140 Event::PaymentPathSuccessful { payment_id: ref actual_payment_id, ref payment_hash, ref path } => {
7141 assert_eq!(payment_id, *actual_payment_id);
7142 assert_eq!(our_payment_hash, *payment_hash.as_ref().unwrap());
7143 assert_eq!(route.paths[0], *path);
7145 _ => panic!("Unexpected event"),
7150 fn test_keysend_dup_payment_hash() {
7151 // (1): Test that a keysend payment with a duplicate payment hash to an existing pending
7152 // outbound regular payment fails as expected.
7153 // (2): Test that a regular payment with a duplicate payment hash to an existing keysend payment
7154 // fails as expected.
7155 let chanmon_cfgs = create_chanmon_cfgs(2);
7156 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7157 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
7158 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7159 create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known());
7160 let scorer = test_utils::TestScorer::with_penalty(0);
7161 let random_seed_bytes = chanmon_cfgs[1].keys_manager.get_secure_random_bytes();
7163 // To start (1), send a regular payment but don't claim it.
7164 let expected_route = [&nodes[1]];
7165 let (payment_preimage, payment_hash, _) = route_payment(&nodes[0], &expected_route, 100_000);
7167 // Next, attempt a keysend payment and make sure it fails.
7168 let route_params = RouteParameters {
7169 payment_params: PaymentParameters::for_keysend(expected_route.last().unwrap().node.get_our_node_id()),
7170 final_value_msat: 100_000,
7171 final_cltv_expiry_delta: TEST_FINAL_CLTV,
7173 let route = find_route(
7174 &nodes[0].node.get_our_node_id(), &route_params, nodes[0].network_graph, None,
7175 nodes[0].logger, &scorer, &random_seed_bytes
7177 nodes[0].node.send_spontaneous_payment(&route, Some(payment_preimage)).unwrap();
7178 check_added_monitors!(nodes[0], 1);
7179 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
7180 assert_eq!(events.len(), 1);
7181 let ev = events.drain(..).next().unwrap();
7182 let payment_event = SendEvent::from_event(ev);
7183 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
7184 check_added_monitors!(nodes[1], 0);
7185 commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
7186 expect_pending_htlcs_forwardable!(nodes[1]);
7187 expect_pending_htlcs_forwardable!(nodes[1]);
7188 check_added_monitors!(nodes[1], 1);
7189 let updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
7190 assert!(updates.update_add_htlcs.is_empty());
7191 assert!(updates.update_fulfill_htlcs.is_empty());
7192 assert_eq!(updates.update_fail_htlcs.len(), 1);
7193 assert!(updates.update_fail_malformed_htlcs.is_empty());
7194 assert!(updates.update_fee.is_none());
7195 nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &updates.update_fail_htlcs[0]);
7196 commitment_signed_dance!(nodes[0], nodes[1], updates.commitment_signed, true, true);
7197 expect_payment_failed!(nodes[0], payment_hash, true);
7199 // Finally, claim the original payment.
7200 claim_payment(&nodes[0], &expected_route, payment_preimage);
7202 // To start (2), send a keysend payment but don't claim it.
7203 let payment_preimage = PaymentPreimage([42; 32]);
7204 let route = find_route(
7205 &nodes[0].node.get_our_node_id(), &route_params, nodes[0].network_graph, None,
7206 nodes[0].logger, &scorer, &random_seed_bytes
7208 let (payment_hash, _) = nodes[0].node.send_spontaneous_payment(&route, Some(payment_preimage)).unwrap();
7209 check_added_monitors!(nodes[0], 1);
7210 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
7211 assert_eq!(events.len(), 1);
7212 let event = events.pop().unwrap();
7213 let path = vec![&nodes[1]];
7214 pass_along_path(&nodes[0], &path, 100_000, payment_hash, None, event, true, Some(payment_preimage));
7216 // Next, attempt a regular payment and make sure it fails.
7217 let payment_secret = PaymentSecret([43; 32]);
7218 nodes[0].node.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
7219 check_added_monitors!(nodes[0], 1);
7220 let mut events = nodes[0].node.get_and_clear_pending_msg_events();
7221 assert_eq!(events.len(), 1);
7222 let ev = events.drain(..).next().unwrap();
7223 let payment_event = SendEvent::from_event(ev);
7224 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &payment_event.msgs[0]);
7225 check_added_monitors!(nodes[1], 0);
7226 commitment_signed_dance!(nodes[1], nodes[0], payment_event.commitment_msg, false);
7227 expect_pending_htlcs_forwardable!(nodes[1]);
7228 expect_pending_htlcs_forwardable!(nodes[1]);
7229 check_added_monitors!(nodes[1], 1);
7230 let updates = get_htlc_update_msgs!(nodes[1], nodes[0].node.get_our_node_id());
7231 assert!(updates.update_add_htlcs.is_empty());
7232 assert!(updates.update_fulfill_htlcs.is_empty());
7233 assert_eq!(updates.update_fail_htlcs.len(), 1);
7234 assert!(updates.update_fail_malformed_htlcs.is_empty());
7235 assert!(updates.update_fee.is_none());
7236 nodes[0].node.handle_update_fail_htlc(&nodes[1].node.get_our_node_id(), &updates.update_fail_htlcs[0]);
7237 commitment_signed_dance!(nodes[0], nodes[1], updates.commitment_signed, true, true);
7238 expect_payment_failed!(nodes[0], payment_hash, true);
7240 // Finally, succeed the keysend payment.
7241 claim_payment(&nodes[0], &expected_route, payment_preimage);
7245 fn test_keysend_hash_mismatch() {
7246 // Test that if we receive a keysend `update_add_htlc` msg, we fail as expected if the keysend
7247 // preimage doesn't match the msg's payment hash.
7248 let chanmon_cfgs = create_chanmon_cfgs(2);
7249 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7250 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
7251 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7253 let payer_pubkey = nodes[0].node.get_our_node_id();
7254 let payee_pubkey = nodes[1].node.get_our_node_id();
7255 nodes[0].node.peer_connected(&payee_pubkey, &msgs::Init { features: InitFeatures::known(), remote_network_address: None });
7256 nodes[1].node.peer_connected(&payer_pubkey, &msgs::Init { features: InitFeatures::known(), remote_network_address: None });
7258 let _chan = create_chan_between_nodes(&nodes[0], &nodes[1], InitFeatures::known(), InitFeatures::known());
7259 let route_params = RouteParameters {
7260 payment_params: PaymentParameters::for_keysend(payee_pubkey),
7261 final_value_msat: 10000,
7262 final_cltv_expiry_delta: 40,
7264 let network_graph = nodes[0].network_graph;
7265 let first_hops = nodes[0].node.list_usable_channels();
7266 let scorer = test_utils::TestScorer::with_penalty(0);
7267 let random_seed_bytes = chanmon_cfgs[1].keys_manager.get_secure_random_bytes();
7268 let route = find_route(
7269 &payer_pubkey, &route_params, network_graph, Some(&first_hops.iter().collect::<Vec<_>>()),
7270 nodes[0].logger, &scorer, &random_seed_bytes
7273 let test_preimage = PaymentPreimage([42; 32]);
7274 let mismatch_payment_hash = PaymentHash([43; 32]);
7275 let _ = nodes[0].node.send_payment_internal(&route, mismatch_payment_hash, &None, Some(test_preimage), None, None).unwrap();
7276 check_added_monitors!(nodes[0], 1);
7278 let updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
7279 assert_eq!(updates.update_add_htlcs.len(), 1);
7280 assert!(updates.update_fulfill_htlcs.is_empty());
7281 assert!(updates.update_fail_htlcs.is_empty());
7282 assert!(updates.update_fail_malformed_htlcs.is_empty());
7283 assert!(updates.update_fee.is_none());
7284 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
7286 nodes[1].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "Payment preimage didn't match payment hash".to_string(), 1);
7290 fn test_keysend_msg_with_secret_err() {
7291 // Test that we error as expected if we receive a keysend payment that includes a payment secret.
7292 let chanmon_cfgs = create_chanmon_cfgs(2);
7293 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7294 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
7295 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7297 let payer_pubkey = nodes[0].node.get_our_node_id();
7298 let payee_pubkey = nodes[1].node.get_our_node_id();
7299 nodes[0].node.peer_connected(&payee_pubkey, &msgs::Init { features: InitFeatures::known(), remote_network_address: None });
7300 nodes[1].node.peer_connected(&payer_pubkey, &msgs::Init { features: InitFeatures::known(), remote_network_address: None });
7302 let _chan = create_chan_between_nodes(&nodes[0], &nodes[1], InitFeatures::known(), InitFeatures::known());
7303 let route_params = RouteParameters {
7304 payment_params: PaymentParameters::for_keysend(payee_pubkey),
7305 final_value_msat: 10000,
7306 final_cltv_expiry_delta: 40,
7308 let network_graph = nodes[0].network_graph;
7309 let first_hops = nodes[0].node.list_usable_channels();
7310 let scorer = test_utils::TestScorer::with_penalty(0);
7311 let random_seed_bytes = chanmon_cfgs[1].keys_manager.get_secure_random_bytes();
7312 let route = find_route(
7313 &payer_pubkey, &route_params, network_graph, Some(&first_hops.iter().collect::<Vec<_>>()),
7314 nodes[0].logger, &scorer, &random_seed_bytes
7317 let test_preimage = PaymentPreimage([42; 32]);
7318 let test_secret = PaymentSecret([43; 32]);
7319 let payment_hash = PaymentHash(Sha256::hash(&test_preimage.0).into_inner());
7320 let _ = nodes[0].node.send_payment_internal(&route, payment_hash, &Some(test_secret), Some(test_preimage), None, None).unwrap();
7321 check_added_monitors!(nodes[0], 1);
7323 let updates = get_htlc_update_msgs!(nodes[0], nodes[1].node.get_our_node_id());
7324 assert_eq!(updates.update_add_htlcs.len(), 1);
7325 assert!(updates.update_fulfill_htlcs.is_empty());
7326 assert!(updates.update_fail_htlcs.is_empty());
7327 assert!(updates.update_fail_malformed_htlcs.is_empty());
7328 assert!(updates.update_fee.is_none());
7329 nodes[1].node.handle_update_add_htlc(&nodes[0].node.get_our_node_id(), &updates.update_add_htlcs[0]);
7331 nodes[1].logger.assert_log_contains("lightning::ln::channelmanager".to_string(), "We don't support MPP keysend payments".to_string(), 1);
7335 fn test_multi_hop_missing_secret() {
7336 let chanmon_cfgs = create_chanmon_cfgs(4);
7337 let node_cfgs = create_node_cfgs(4, &chanmon_cfgs);
7338 let node_chanmgrs = create_node_chanmgrs(4, &node_cfgs, &[None, None, None, None]);
7339 let nodes = create_network(4, &node_cfgs, &node_chanmgrs);
7341 let chan_1_id = create_announced_chan_between_nodes(&nodes, 0, 1, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
7342 let chan_2_id = create_announced_chan_between_nodes(&nodes, 0, 2, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
7343 let chan_3_id = create_announced_chan_between_nodes(&nodes, 1, 3, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
7344 let chan_4_id = create_announced_chan_between_nodes(&nodes, 2, 3, InitFeatures::known(), InitFeatures::known()).0.contents.short_channel_id;
7346 // Marshall an MPP route.
7347 let (mut route, payment_hash, _, _) = get_route_and_payment_hash!(&nodes[0], nodes[3], 100000);
7348 let path = route.paths[0].clone();
7349 route.paths.push(path);
7350 route.paths[0][0].pubkey = nodes[1].node.get_our_node_id();
7351 route.paths[0][0].short_channel_id = chan_1_id;
7352 route.paths[0][1].short_channel_id = chan_3_id;
7353 route.paths[1][0].pubkey = nodes[2].node.get_our_node_id();
7354 route.paths[1][0].short_channel_id = chan_2_id;
7355 route.paths[1][1].short_channel_id = chan_4_id;
7357 match nodes[0].node.send_payment(&route, payment_hash, &None).unwrap_err() {
7358 PaymentSendFailure::ParameterError(APIError::APIMisuseError { ref err }) => {
7359 assert!(regex::Regex::new(r"Payment secret is required for multi-path payments").unwrap().is_match(err)) },
7360 _ => panic!("unexpected error")
7365 fn bad_inbound_payment_hash() {
7366 // Add coverage for checking that a user-provided payment hash matches the payment secret.
7367 let chanmon_cfgs = create_chanmon_cfgs(2);
7368 let node_cfgs = create_node_cfgs(2, &chanmon_cfgs);
7369 let node_chanmgrs = create_node_chanmgrs(2, &node_cfgs, &[None, None]);
7370 let nodes = create_network(2, &node_cfgs, &node_chanmgrs);
7372 let (_, payment_hash, payment_secret) = get_payment_preimage_hash!(&nodes[0]);
7373 let payment_data = msgs::FinalOnionHopData {
7375 total_msat: 100_000,
7378 // Ensure that if the payment hash given to `inbound_payment::verify` differs from the original,
7379 // payment verification fails as expected.
7380 let mut bad_payment_hash = payment_hash.clone();
7381 bad_payment_hash.0[0] += 1;
7382 match inbound_payment::verify(bad_payment_hash, &payment_data, nodes[0].node.highest_seen_timestamp.load(Ordering::Acquire) as u64, &nodes[0].node.inbound_payment_key, &nodes[0].logger) {
7383 Ok(_) => panic!("Unexpected ok"),
7385 nodes[0].logger.assert_log_contains("lightning::ln::inbound_payment".to_string(), "Failing HTLC with user-generated payment_hash".to_string(), 1);
7389 // Check that using the original payment hash succeeds.
7390 assert!(inbound_payment::verify(payment_hash, &payment_data, nodes[0].node.highest_seen_timestamp.load(Ordering::Acquire) as u64, &nodes[0].node.inbound_payment_key, &nodes[0].logger).is_ok());
7394 #[cfg(all(any(test, feature = "_test_utils"), feature = "_bench_unstable"))]
7397 use chain::chainmonitor::{ChainMonitor, Persist};
7398 use chain::keysinterface::{KeysManager, KeysInterface, InMemorySigner};
7399 use ln::channelmanager::{BestBlock, ChainParameters, ChannelManager, PaymentHash, PaymentPreimage};
7400 use ln::features::{InitFeatures, InvoiceFeatures};
7401 use ln::functional_test_utils::*;
7402 use ln::msgs::{ChannelMessageHandler, Init};
7403 use routing::network_graph::NetworkGraph;
7404 use routing::router::{PaymentParameters, get_route};
7405 use util::test_utils;
7406 use util::config::UserConfig;
7407 use util::events::{Event, MessageSendEvent, MessageSendEventsProvider};
7409 use bitcoin::hashes::Hash;
7410 use bitcoin::hashes::sha256::Hash as Sha256;
7411 use bitcoin::{Block, BlockHeader, Transaction, TxOut};
7413 use sync::{Arc, Mutex};
7417 struct NodeHolder<'a, P: Persist<InMemorySigner>> {
7418 node: &'a ChannelManager<InMemorySigner,
7419 &'a ChainMonitor<InMemorySigner, &'a test_utils::TestChainSource,
7420 &'a test_utils::TestBroadcaster, &'a test_utils::TestFeeEstimator,
7421 &'a test_utils::TestLogger, &'a P>,
7422 &'a test_utils::TestBroadcaster, &'a KeysManager,
7423 &'a test_utils::TestFeeEstimator, &'a test_utils::TestLogger>
7428 fn bench_sends(bench: &mut Bencher) {
7429 bench_two_sends(bench, test_utils::TestPersister::new(), test_utils::TestPersister::new());
7432 pub fn bench_two_sends<P: Persist<InMemorySigner>>(bench: &mut Bencher, persister_a: P, persister_b: P) {
7433 // Do a simple benchmark of sending a payment back and forth between two nodes.
7434 // Note that this is unrealistic as each payment send will require at least two fsync
7436 let network = bitcoin::Network::Testnet;
7437 let genesis_hash = bitcoin::blockdata::constants::genesis_block(network).header.block_hash();
7439 let tx_broadcaster = test_utils::TestBroadcaster{txn_broadcasted: Mutex::new(Vec::new()), blocks: Arc::new(Mutex::new(Vec::new()))};
7440 let fee_estimator = test_utils::TestFeeEstimator { sat_per_kw: Mutex::new(253) };
7442 let mut config: UserConfig = Default::default();
7443 config.own_channel_config.minimum_depth = 1;
7445 let logger_a = test_utils::TestLogger::with_id("node a".to_owned());
7446 let chain_monitor_a = ChainMonitor::new(None, &tx_broadcaster, &logger_a, &fee_estimator, &persister_a);
7447 let seed_a = [1u8; 32];
7448 let keys_manager_a = KeysManager::new(&seed_a, 42, 42);
7449 let node_a = ChannelManager::new(&fee_estimator, &chain_monitor_a, &tx_broadcaster, &logger_a, &keys_manager_a, config.clone(), ChainParameters {
7451 best_block: BestBlock::from_genesis(network),
7453 let node_a_holder = NodeHolder { node: &node_a };
7455 let logger_b = test_utils::TestLogger::with_id("node a".to_owned());
7456 let chain_monitor_b = ChainMonitor::new(None, &tx_broadcaster, &logger_a, &fee_estimator, &persister_b);
7457 let seed_b = [2u8; 32];
7458 let keys_manager_b = KeysManager::new(&seed_b, 42, 42);
7459 let node_b = ChannelManager::new(&fee_estimator, &chain_monitor_b, &tx_broadcaster, &logger_b, &keys_manager_b, config.clone(), ChainParameters {
7461 best_block: BestBlock::from_genesis(network),
7463 let node_b_holder = NodeHolder { node: &node_b };
7465 node_a.peer_connected(&node_b.get_our_node_id(), &Init { features: InitFeatures::known(), remote_network_address: None });
7466 node_b.peer_connected(&node_a.get_our_node_id(), &Init { features: InitFeatures::known(), remote_network_address: None });
7467 node_a.create_channel(node_b.get_our_node_id(), 8_000_000, 100_000_000, 42, None).unwrap();
7468 node_b.handle_open_channel(&node_a.get_our_node_id(), InitFeatures::known(), &get_event_msg!(node_a_holder, MessageSendEvent::SendOpenChannel, node_b.get_our_node_id()));
7469 node_a.handle_accept_channel(&node_b.get_our_node_id(), InitFeatures::known(), &get_event_msg!(node_b_holder, MessageSendEvent::SendAcceptChannel, node_a.get_our_node_id()));
7472 if let Event::FundingGenerationReady { temporary_channel_id, output_script, .. } = get_event!(node_a_holder, Event::FundingGenerationReady) {
7473 tx = Transaction { version: 2, lock_time: 0, input: Vec::new(), output: vec![TxOut {
7474 value: 8_000_000, script_pubkey: output_script,
7476 node_a.funding_transaction_generated(&temporary_channel_id, &node_b.get_our_node_id(), tx.clone()).unwrap();
7477 } else { panic!(); }
7479 node_b.handle_funding_created(&node_a.get_our_node_id(), &get_event_msg!(node_a_holder, MessageSendEvent::SendFundingCreated, node_b.get_our_node_id()));
7480 node_a.handle_funding_signed(&node_b.get_our_node_id(), &get_event_msg!(node_b_holder, MessageSendEvent::SendFundingSigned, node_a.get_our_node_id()));
7482 assert_eq!(&tx_broadcaster.txn_broadcasted.lock().unwrap()[..], &[tx.clone()]);
7485 header: BlockHeader { version: 0x20000000, prev_blockhash: genesis_hash, merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 },
7488 Listen::block_connected(&node_a, &block, 1);
7489 Listen::block_connected(&node_b, &block, 1);
7491 node_a.handle_funding_locked(&node_b.get_our_node_id(), &get_event_msg!(node_b_holder, MessageSendEvent::SendFundingLocked, node_a.get_our_node_id()));
7492 let msg_events = node_a.get_and_clear_pending_msg_events();
7493 assert_eq!(msg_events.len(), 2);
7494 match msg_events[0] {
7495 MessageSendEvent::SendFundingLocked { ref msg, .. } => {
7496 node_b.handle_funding_locked(&node_a.get_our_node_id(), msg);
7497 get_event_msg!(node_b_holder, MessageSendEvent::SendChannelUpdate, node_a.get_our_node_id());
7501 match msg_events[1] {
7502 MessageSendEvent::SendChannelUpdate { .. } => {},
7506 let dummy_graph = NetworkGraph::new(genesis_hash);
7508 let mut payment_count: u64 = 0;
7509 macro_rules! send_payment {
7510 ($node_a: expr, $node_b: expr) => {
7511 let usable_channels = $node_a.list_usable_channels();
7512 let payment_params = PaymentParameters::from_node_id($node_b.get_our_node_id())
7513 .with_features(InvoiceFeatures::known());
7514 let scorer = test_utils::TestScorer::with_penalty(0);
7515 let seed = [3u8; 32];
7516 let keys_manager = KeysManager::new(&seed, 42, 42);
7517 let random_seed_bytes = keys_manager.get_secure_random_bytes();
7518 let route = get_route(&$node_a.get_our_node_id(), &payment_params, &dummy_graph.read_only(),
7519 Some(&usable_channels.iter().map(|r| r).collect::<Vec<_>>()), 10_000, TEST_FINAL_CLTV, &logger_a, &scorer, &random_seed_bytes).unwrap();
7521 let mut payment_preimage = PaymentPreimage([0; 32]);
7522 payment_preimage.0[0..8].copy_from_slice(&payment_count.to_le_bytes());
7524 let payment_hash = PaymentHash(Sha256::hash(&payment_preimage.0[..]).into_inner());
7525 let payment_secret = $node_b.create_inbound_payment_for_hash(payment_hash, None, 7200).unwrap();
7527 $node_a.send_payment(&route, payment_hash, &Some(payment_secret)).unwrap();
7528 let payment_event = SendEvent::from_event($node_a.get_and_clear_pending_msg_events().pop().unwrap());
7529 $node_b.handle_update_add_htlc(&$node_a.get_our_node_id(), &payment_event.msgs[0]);
7530 $node_b.handle_commitment_signed(&$node_a.get_our_node_id(), &payment_event.commitment_msg);
7531 let (raa, cs) = get_revoke_commit_msgs!(NodeHolder { node: &$node_b }, $node_a.get_our_node_id());
7532 $node_a.handle_revoke_and_ack(&$node_b.get_our_node_id(), &raa);
7533 $node_a.handle_commitment_signed(&$node_b.get_our_node_id(), &cs);
7534 $node_b.handle_revoke_and_ack(&$node_a.get_our_node_id(), &get_event_msg!(NodeHolder { node: &$node_a }, MessageSendEvent::SendRevokeAndACK, $node_b.get_our_node_id()));
7536 expect_pending_htlcs_forwardable!(NodeHolder { node: &$node_b });
7537 expect_payment_received!(NodeHolder { node: &$node_b }, payment_hash, payment_secret, 10_000);
7538 assert!($node_b.claim_funds(payment_preimage));
7540 match $node_b.get_and_clear_pending_msg_events().pop().unwrap() {
7541 MessageSendEvent::UpdateHTLCs { node_id, updates } => {
7542 assert_eq!(node_id, $node_a.get_our_node_id());
7543 $node_a.handle_update_fulfill_htlc(&$node_b.get_our_node_id(), &updates.update_fulfill_htlcs[0]);
7544 $node_a.handle_commitment_signed(&$node_b.get_our_node_id(), &updates.commitment_signed);
7546 _ => panic!("Failed to generate claim event"),
7549 let (raa, cs) = get_revoke_commit_msgs!(NodeHolder { node: &$node_a }, $node_b.get_our_node_id());
7550 $node_b.handle_revoke_and_ack(&$node_a.get_our_node_id(), &raa);
7551 $node_b.handle_commitment_signed(&$node_a.get_our_node_id(), &cs);
7552 $node_a.handle_revoke_and_ack(&$node_b.get_our_node_id(), &get_event_msg!(NodeHolder { node: &$node_b }, MessageSendEvent::SendRevokeAndACK, $node_a.get_our_node_id()));
7554 expect_payment_sent!(NodeHolder { node: &$node_a }, payment_preimage);
7559 send_payment!(node_a, node_b);
7560 send_payment!(node_b, node_a);