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 //! Events are returned from various bits in the library which indicate some action must be taken
13 //! Because we don't have a built-in runtime, it's up to the client to call events at a time in the
14 //! future, as well as generate and broadcast funding transactions handle payment preimages and a
18 pub mod bump_transaction;
21 pub use bump_transaction::BumpTransactionEvent;
23 use crate::chain::keysinterface::SpendableOutputDescriptor;
24 use crate::ln::channelmanager::{InterceptId, PaymentId};
25 use crate::ln::channel::FUNDING_CONF_DEADLINE_BLOCKS;
26 use crate::ln::features::ChannelTypeFeatures;
28 use crate::ln::{PaymentPreimage, PaymentHash, PaymentSecret};
29 use crate::routing::gossip::NetworkUpdate;
30 use crate::util::errors::APIError;
31 use crate::util::ser::{BigSize, FixedLengthReader, Writeable, Writer, MaybeReadable, Readable, RequiredWrapper, UpgradableRequired, WithoutLength};
32 use crate::util::string::UntrustedString;
33 use crate::routing::router::{RouteHop, RouteParameters};
35 use bitcoin::{PackedLockTime, Transaction, OutPoint};
37 use bitcoin::{Txid, TxIn, TxOut, Witness};
38 use bitcoin::blockdata::script::Script;
39 use bitcoin::hashes::Hash;
40 use bitcoin::hashes::sha256::Hash as Sha256;
41 use bitcoin::secp256k1::PublicKey;
43 use crate::prelude::*;
44 use core::time::Duration;
48 /// Some information provided on receipt of payment depends on whether the payment received is a
49 /// spontaneous payment or a "conventional" lightning payment that's paying an invoice.
50 #[derive(Clone, Debug, PartialEq, Eq)]
51 pub enum PaymentPurpose {
52 /// Information for receiving a payment that we generated an invoice for.
54 /// The preimage to the payment_hash, if the payment hash (and secret) were fetched via
55 /// [`ChannelManager::create_inbound_payment`]. If provided, this can be handed directly to
56 /// [`ChannelManager::claim_funds`].
58 /// [`ChannelManager::create_inbound_payment`]: crate::ln::channelmanager::ChannelManager::create_inbound_payment
59 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
60 payment_preimage: Option<PaymentPreimage>,
61 /// The "payment secret". This authenticates the sender to the recipient, preventing a
62 /// number of deanonymization attacks during the routing process.
63 /// It is provided here for your reference, however its accuracy is enforced directly by
64 /// [`ChannelManager`] using the values you previously provided to
65 /// [`ChannelManager::create_inbound_payment`] or
66 /// [`ChannelManager::create_inbound_payment_for_hash`].
68 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
69 /// [`ChannelManager::create_inbound_payment`]: crate::ln::channelmanager::ChannelManager::create_inbound_payment
70 /// [`ChannelManager::create_inbound_payment_for_hash`]: crate::ln::channelmanager::ChannelManager::create_inbound_payment_for_hash
71 payment_secret: PaymentSecret,
73 /// Because this is a spontaneous payment, the payer generated their own preimage rather than us
74 /// (the payee) providing a preimage.
75 SpontaneousPayment(PaymentPreimage),
78 impl_writeable_tlv_based_enum!(PaymentPurpose,
79 (0, InvoicePayment) => {
80 (0, payment_preimage, option),
81 (2, payment_secret, required),
83 (2, SpontaneousPayment)
86 /// When the payment path failure took place and extra details about it. [`PathFailure::OnPath`] may
87 /// contain a [`NetworkUpdate`] that needs to be applied to the [`NetworkGraph`].
89 /// [`NetworkUpdate`]: crate::routing::gossip::NetworkUpdate
90 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
91 #[derive(Clone, Debug, Eq, PartialEq)]
92 pub enum PathFailure {
93 /// We failed to initially send the payment and no HTLC was committed to. Contains the relevant
96 /// The error surfaced from initial send.
99 /// A hop on the path failed to forward our payment.
101 /// If present, this [`NetworkUpdate`] should be applied to the [`NetworkGraph`] so that routing
102 /// decisions can take into account the update.
104 /// [`NetworkUpdate`]: crate::routing::gossip::NetworkUpdate
105 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
106 network_update: Option<NetworkUpdate>,
110 impl_writeable_tlv_based_enum_upgradable!(PathFailure,
112 (0, network_update, upgradable_option),
114 (2, InitialSend) => {
115 (0, err, upgradable_required),
119 #[derive(Clone, Debug, PartialEq, Eq)]
120 /// The reason the channel was closed. See individual variants more details.
121 pub enum ClosureReason {
122 /// Closure generated from receiving a peer error message.
124 /// Our counterparty may have broadcasted their latest commitment state, and we have
126 CounterpartyForceClosed {
127 /// The error which the peer sent us.
129 /// Be careful about printing the peer_msg, a well-crafted message could exploit
130 /// a security vulnerability in the terminal emulator or the logging subsystem.
131 /// To be safe, use `Display` on `UntrustedString`
133 /// [`UntrustedString`]: crate::util::string::UntrustedString
134 peer_msg: UntrustedString,
136 /// Closure generated from [`ChannelManager::force_close_channel`], called by the user.
138 /// [`ChannelManager::force_close_channel`]: crate::ln::channelmanager::ChannelManager::force_close_channel.
140 /// The channel was closed after negotiating a cooperative close and we've now broadcasted
141 /// the cooperative close transaction. Note the shutdown may have been initiated by us.
142 //TODO: split between CounterpartyInitiated/LocallyInitiated
144 /// A commitment transaction was confirmed on chain, closing the channel. Most likely this
145 /// commitment transaction came from our counterparty, but it may also have come from
146 /// a copy of our own `ChannelMonitor`.
147 CommitmentTxConfirmed,
148 /// The funding transaction failed to confirm in a timely manner on an inbound channel.
150 /// Closure generated from processing an event, likely a HTLC forward/relay/reception.
152 /// A developer-readable error message which we generated.
155 /// The peer disconnected prior to funding completing. In this case the spec mandates that we
156 /// forget the channel entirely - we can attempt again if the peer reconnects.
158 /// This includes cases where we restarted prior to funding completion, including prior to the
159 /// initial [`ChannelMonitor`] persistence completing.
161 /// In LDK versions prior to 0.0.107 this could also occur if we were unable to connect to the
162 /// peer because of mutual incompatibility between us and our channel counterparty.
164 /// [`ChannelMonitor`]: crate::chain::channelmonitor::ChannelMonitor
166 /// Closure generated from `ChannelManager::read` if the [`ChannelMonitor`] is newer than
167 /// the [`ChannelManager`] deserialized.
169 /// [`ChannelMonitor`]: crate::chain::channelmonitor::ChannelMonitor
170 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
171 OutdatedChannelManager
174 impl core::fmt::Display for ClosureReason {
175 fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
176 f.write_str("Channel closed because ")?;
178 ClosureReason::CounterpartyForceClosed { peer_msg } => {
179 f.write_fmt(format_args!("counterparty force-closed with message: {}", peer_msg))
181 ClosureReason::HolderForceClosed => f.write_str("user manually force-closed the channel"),
182 ClosureReason::CooperativeClosure => f.write_str("the channel was cooperatively closed"),
183 ClosureReason::CommitmentTxConfirmed => f.write_str("commitment or closing transaction was confirmed on chain."),
184 ClosureReason::FundingTimedOut => write!(f, "funding transaction failed to confirm within {} blocks", FUNDING_CONF_DEADLINE_BLOCKS),
185 ClosureReason::ProcessingError { err } => {
186 f.write_str("of an exception: ")?;
189 ClosureReason::DisconnectedPeer => f.write_str("the peer disconnected prior to the channel being funded"),
190 ClosureReason::OutdatedChannelManager => f.write_str("the ChannelManager read from disk was stale compared to ChannelMonitor(s)"),
195 impl_writeable_tlv_based_enum_upgradable!(ClosureReason,
196 (0, CounterpartyForceClosed) => { (1, peer_msg, required) },
197 (1, FundingTimedOut) => {},
198 (2, HolderForceClosed) => {},
199 (6, CommitmentTxConfirmed) => {},
200 (4, CooperativeClosure) => {},
201 (8, ProcessingError) => { (1, err, required) },
202 (10, DisconnectedPeer) => {},
203 (12, OutdatedChannelManager) => {},
206 /// Intended destination of a failed HTLC as indicated in [`Event::HTLCHandlingFailed`].
207 #[derive(Clone, Debug, PartialEq, Eq)]
208 pub enum HTLCDestination {
209 /// We tried forwarding to a channel but failed to do so. An example of such an instance is when
210 /// there is insufficient capacity in our outbound channel.
212 /// The `node_id` of the next node. For backwards compatibility, this field is
213 /// marked as optional, versions prior to 0.0.110 may not always be able to provide
214 /// counterparty node information.
215 node_id: Option<PublicKey>,
216 /// The outgoing `channel_id` between us and the next node.
217 channel_id: [u8; 32],
219 /// Scenario where we are unsure of the next node to forward the HTLC to.
221 /// Short channel id we are requesting to forward an HTLC to.
222 requested_forward_scid: u64,
224 /// We couldn't forward to the outgoing scid. An example would be attempting to send a duplicate
227 /// Short channel id we are requesting to forward an HTLC to.
228 requested_forward_scid: u64
230 /// Failure scenario where an HTLC may have been forwarded to be intended for us,
231 /// but is invalid for some reason, so we reject it.
233 /// Some of the reasons may include:
235 /// * Expected MPP amount has already been reached
236 /// * Claimable amount does not match expected amount
238 /// The payment hash of the payment we attempted to process.
239 payment_hash: PaymentHash
243 impl_writeable_tlv_based_enum_upgradable!(HTLCDestination,
244 (0, NextHopChannel) => {
245 (0, node_id, required),
246 (2, channel_id, required),
248 (1, InvalidForward) => {
249 (0, requested_forward_scid, required),
251 (2, UnknownNextHop) => {
252 (0, requested_forward_scid, required),
254 (4, FailedPayment) => {
255 (0, payment_hash, required),
259 /// Will be used in [`Event::HTLCIntercepted`] to identify the next hop in the HTLC's path.
260 /// Currently only used in serialization for the sake of maintaining compatibility. More variants
261 /// will be added for general-purpose HTLC forward intercepts as well as trampoline forward
262 /// intercepts in upcoming work.
263 enum InterceptNextHop {
265 requested_next_hop_scid: u64,
269 impl_writeable_tlv_based_enum!(InterceptNextHop,
271 (0, requested_next_hop_scid, required),
275 /// The reason the payment failed. Used in [`Event::PaymentFailed`].
276 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
277 pub enum PaymentFailureReason {
278 /// The intended recipient rejected our payment.
280 /// The user chose to abandon this payment by calling [`ChannelManager::abandon_payment`].
282 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
284 /// We exhausted all of our retry attempts while trying to send the payment, or we
285 /// exhausted the [`Retry::Timeout`] if the user set one. If at any point a retry
286 /// attempt failed while being forwarded along the path, an [`Event::PaymentPathFailed`] will
287 /// have come before this.
289 /// [`Retry::Timeout`]: crate::ln::channelmanager::Retry::Timeout
291 /// The payment expired while retrying, based on the provided
292 /// [`PaymentParameters::expiry_time`].
294 /// [`PaymentParameters::expiry_time`]: crate::routing::router::PaymentParameters::expiry_time
296 /// We failed to find a route while retrying the payment.
298 /// This error should generally never happen. This likely means that there is a problem with
303 impl_writeable_tlv_based_enum!(PaymentFailureReason,
304 (0, RecipientRejected) => {},
305 (2, UserAbandoned) => {},
306 (4, RetriesExhausted) => {},
307 (6, PaymentExpired) => {},
308 (8, RouteNotFound) => {},
309 (10, UnexpectedError) => {}, ;
312 /// An Event which you should probably take some action in response to.
314 /// Note that while Writeable and Readable are implemented for Event, you probably shouldn't use
315 /// them directly as they don't round-trip exactly (for example FundingGenerationReady is never
316 /// written as it makes no sense to respond to it after reconnecting to peers).
317 #[derive(Clone, Debug, PartialEq, Eq)]
319 /// Used to indicate that the client should generate a funding transaction with the given
320 /// parameters and then call [`ChannelManager::funding_transaction_generated`].
321 /// Generated in [`ChannelManager`] message handling.
322 /// Note that *all inputs* in the funding transaction must spend SegWit outputs or your
323 /// counterparty can steal your funds!
325 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
326 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
327 FundingGenerationReady {
328 /// The random channel_id we picked which you'll need to pass into
329 /// [`ChannelManager::funding_transaction_generated`].
331 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
332 temporary_channel_id: [u8; 32],
333 /// The counterparty's node_id, which you'll need to pass back into
334 /// [`ChannelManager::funding_transaction_generated`].
336 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
337 counterparty_node_id: PublicKey,
338 /// The value, in satoshis, that the output should have.
339 channel_value_satoshis: u64,
340 /// The script which should be used in the transaction output.
341 output_script: Script,
342 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`], or a
343 /// random value for an inbound channel. This may be zero for objects serialized with LDK
344 /// versions prior to 0.0.113.
346 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
347 user_channel_id: u128,
349 /// Indicates that we've been offered a payment and it needs to be claimed via calling
350 /// [`ChannelManager::claim_funds`] with the preimage given in [`PaymentPurpose`].
352 /// Note that if the preimage is not known, you should call
353 /// [`ChannelManager::fail_htlc_backwards`] or [`ChannelManager::fail_htlc_backwards_with_reason`]
354 /// to free up resources for this HTLC and avoid network congestion.
355 /// If you fail to call either [`ChannelManager::claim_funds`], [`ChannelManager::fail_htlc_backwards`],
356 /// or [`ChannelManager::fail_htlc_backwards_with_reason`] within the HTLC's timeout, the HTLC will be
357 /// automatically failed.
360 /// LDK will not stop an inbound payment from being paid multiple times, so multiple
361 /// `PaymentClaimable` events may be generated for the same payment. In such a case it is
362 /// polite (and required in the lightning specification) to fail the payment the second time
363 /// and give the sender their money back rather than accepting double payment.
366 /// This event used to be called `PaymentReceived` in LDK versions 0.0.112 and earlier.
368 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
369 /// [`ChannelManager::fail_htlc_backwards`]: crate::ln::channelmanager::ChannelManager::fail_htlc_backwards
370 /// [`ChannelManager::fail_htlc_backwards_with_reason`]: crate::ln::channelmanager::ChannelManager::fail_htlc_backwards_with_reason
372 /// The node that will receive the payment after it has been claimed.
373 /// This is useful to identify payments received via [phantom nodes].
374 /// This field will always be filled in when the event was generated by LDK versions
375 /// 0.0.113 and above.
377 /// [phantom nodes]: crate::chain::keysinterface::PhantomKeysManager
378 receiver_node_id: Option<PublicKey>,
379 /// The hash for which the preimage should be handed to the ChannelManager. Note that LDK will
380 /// not stop you from registering duplicate payment hashes for inbound payments.
381 payment_hash: PaymentHash,
382 /// The value, in thousandths of a satoshi, that this payment is for.
384 /// Information for claiming this received payment, based on whether the purpose of the
385 /// payment is to pay an invoice or to send a spontaneous payment.
386 purpose: PaymentPurpose,
387 /// The `channel_id` indicating over which channel we received the payment.
388 via_channel_id: Option<[u8; 32]>,
389 /// The `user_channel_id` indicating over which channel we received the payment.
390 via_user_channel_id: Option<u128>,
391 /// The block height at which this payment will be failed back and will no longer be
392 /// eligible for claiming.
394 /// Prior to this height, a call to [`ChannelManager::claim_funds`] is guaranteed to
395 /// succeed, however you should wait for [`Event::PaymentClaimed`] to be sure.
397 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
398 claim_deadline: Option<u32>,
400 /// Indicates a payment has been claimed and we've received money!
402 /// This most likely occurs when [`ChannelManager::claim_funds`] has been called in response
403 /// to an [`Event::PaymentClaimable`]. However, if we previously crashed during a
404 /// [`ChannelManager::claim_funds`] call you may see this event without a corresponding
405 /// [`Event::PaymentClaimable`] event.
408 /// LDK will not stop an inbound payment from being paid multiple times, so multiple
409 /// `PaymentClaimable` events may be generated for the same payment. If you then call
410 /// [`ChannelManager::claim_funds`] twice for the same [`Event::PaymentClaimable`] you may get
411 /// multiple `PaymentClaimed` events.
413 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
415 /// The node that received the payment.
416 /// This is useful to identify payments which were received via [phantom nodes].
417 /// This field will always be filled in when the event was generated by LDK versions
418 /// 0.0.113 and above.
420 /// [phantom nodes]: crate::chain::keysinterface::PhantomKeysManager
421 receiver_node_id: Option<PublicKey>,
422 /// The payment hash of the claimed payment. Note that LDK will not stop you from
423 /// registering duplicate payment hashes for inbound payments.
424 payment_hash: PaymentHash,
425 /// The value, in thousandths of a satoshi, that this payment is for.
427 /// The purpose of the claimed payment, i.e. whether the payment was for an invoice or a
428 /// spontaneous payment.
429 purpose: PaymentPurpose,
431 /// Indicates an outbound payment we made succeeded (i.e. it made it all the way to its target
432 /// and we got back the payment preimage for it).
434 /// Note for MPP payments: in rare cases, this event may be preceded by a `PaymentPathFailed`
435 /// event. In this situation, you SHOULD treat this payment as having succeeded.
437 /// The `payment_id` passed to [`ChannelManager::send_payment`].
439 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
440 payment_id: Option<PaymentId>,
441 /// The preimage to the hash given to ChannelManager::send_payment.
442 /// Note that this serves as a payment receipt, if you wish to have such a thing, you must
443 /// store it somehow!
444 payment_preimage: PaymentPreimage,
445 /// The hash that was given to [`ChannelManager::send_payment`].
447 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
448 payment_hash: PaymentHash,
449 /// The total fee which was spent at intermediate hops in this payment, across all paths.
451 /// Note that, like [`Route::get_total_fees`] this does *not* include any potential
452 /// overpayment to the recipient node.
454 /// If the recipient or an intermediate node misbehaves and gives us free money, this may
455 /// overstate the amount paid, though this is unlikely.
457 /// [`Route::get_total_fees`]: crate::routing::router::Route::get_total_fees
458 fee_paid_msat: Option<u64>,
460 /// Indicates an outbound payment failed. Individual [`Event::PaymentPathFailed`] events
461 /// provide failure information for each path attempt in the payment, including retries.
463 /// This event is provided once there are no further pending HTLCs for the payment and the
464 /// payment is no longer retryable, due either to the [`Retry`] provided or
465 /// [`ChannelManager::abandon_payment`] having been called for the corresponding payment.
467 /// [`Retry`]: crate::ln::channelmanager::Retry
468 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
470 /// The `payment_id` passed to [`ChannelManager::send_payment`].
472 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
473 payment_id: PaymentId,
474 /// The hash that was given to [`ChannelManager::send_payment`].
476 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
477 payment_hash: PaymentHash,
479 /// Indicates that a path for an outbound payment was successful.
481 /// Always generated after [`Event::PaymentSent`] and thus useful for scoring channels. See
482 /// [`Event::PaymentSent`] for obtaining the payment preimage.
483 PaymentPathSuccessful {
484 /// The `payment_id` passed to [`ChannelManager::send_payment`].
486 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
487 payment_id: PaymentId,
488 /// The hash that was given to [`ChannelManager::send_payment`].
490 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
491 payment_hash: Option<PaymentHash>,
492 /// The payment path that was successful.
494 /// May contain a closed channel if the HTLC sent along the path was fulfilled on chain.
497 /// Indicates an outbound HTLC we sent failed, likely due to an intermediary node being unable to
500 /// Note that this does *not* indicate that all paths for an MPP payment have failed, see
501 /// [`Event::PaymentFailed`].
503 /// See [`ChannelManager::abandon_payment`] for giving up on this payment before its retries have
506 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
508 /// The `payment_id` passed to [`ChannelManager::send_payment`].
510 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
511 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
512 payment_id: Option<PaymentId>,
513 /// The hash that was given to [`ChannelManager::send_payment`].
515 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
516 payment_hash: PaymentHash,
517 /// Indicates the payment was rejected for some reason by the recipient. This implies that
518 /// the payment has failed, not just the route in question. If this is not set, the payment may
519 /// be retried via a different route.
520 payment_failed_permanently: bool,
521 /// Extra error details based on the failure type. May contain an update that needs to be
522 /// applied to the [`NetworkGraph`].
524 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
525 failure: PathFailure,
526 /// The payment path that failed.
528 /// The channel responsible for the failed payment path.
530 /// Note that for route hints or for the first hop in a path this may be an SCID alias and
531 /// may not refer to a channel in the public network graph. These aliases may also collide
532 /// with channels in the public network graph.
534 /// If this is `Some`, then the corresponding channel should be avoided when the payment is
535 /// retried. May be `None` for older [`Event`] serializations.
536 short_channel_id: Option<u64>,
538 error_code: Option<u16>,
540 error_data: Option<Vec<u8>>,
542 /// Indicates that a probe payment we sent returned successful, i.e., only failed at the destination.
544 /// The id returned by [`ChannelManager::send_probe`].
546 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
547 payment_id: PaymentId,
548 /// The hash generated by [`ChannelManager::send_probe`].
550 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
551 payment_hash: PaymentHash,
552 /// The payment path that was successful.
555 /// Indicates that a probe payment we sent failed at an intermediary node on the path.
557 /// The id returned by [`ChannelManager::send_probe`].
559 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
560 payment_id: PaymentId,
561 /// The hash generated by [`ChannelManager::send_probe`].
563 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
564 payment_hash: PaymentHash,
565 /// The payment path that failed.
567 /// The channel responsible for the failed probe.
569 /// Note that for route hints or for the first hop in a path this may be an SCID alias and
570 /// may not refer to a channel in the public network graph. These aliases may also collide
571 /// with channels in the public network graph.
572 short_channel_id: Option<u64>,
574 /// Used to indicate that [`ChannelManager::process_pending_htlc_forwards`] should be called at
575 /// a time in the future.
577 /// [`ChannelManager::process_pending_htlc_forwards`]: crate::ln::channelmanager::ChannelManager::process_pending_htlc_forwards
578 PendingHTLCsForwardable {
579 /// The minimum amount of time that should be waited prior to calling
580 /// process_pending_htlc_forwards. To increase the effort required to correlate payments,
581 /// you should wait a random amount of time in roughly the range (now + time_forwardable,
582 /// now + 5*time_forwardable).
583 time_forwardable: Duration,
585 /// Used to indicate that we've intercepted an HTLC forward. This event will only be generated if
586 /// you've encoded an intercept scid in the receiver's invoice route hints using
587 /// [`ChannelManager::get_intercept_scid`] and have set [`UserConfig::accept_intercept_htlcs`].
589 /// [`ChannelManager::forward_intercepted_htlc`] or
590 /// [`ChannelManager::fail_intercepted_htlc`] MUST be called in response to this event. See
591 /// their docs for more information.
593 /// [`ChannelManager::get_intercept_scid`]: crate::ln::channelmanager::ChannelManager::get_intercept_scid
594 /// [`UserConfig::accept_intercept_htlcs`]: crate::util::config::UserConfig::accept_intercept_htlcs
595 /// [`ChannelManager::forward_intercepted_htlc`]: crate::ln::channelmanager::ChannelManager::forward_intercepted_htlc
596 /// [`ChannelManager::fail_intercepted_htlc`]: crate::ln::channelmanager::ChannelManager::fail_intercepted_htlc
598 /// An id to help LDK identify which HTLC is being forwarded or failed.
599 intercept_id: InterceptId,
600 /// The fake scid that was programmed as the next hop's scid, generated using
601 /// [`ChannelManager::get_intercept_scid`].
603 /// [`ChannelManager::get_intercept_scid`]: crate::ln::channelmanager::ChannelManager::get_intercept_scid
604 requested_next_hop_scid: u64,
605 /// The payment hash used for this HTLC.
606 payment_hash: PaymentHash,
607 /// How many msats were received on the inbound edge of this HTLC.
608 inbound_amount_msat: u64,
609 /// How many msats the payer intended to route to the next node. Depending on the reason you are
610 /// intercepting this payment, you might take a fee by forwarding less than this amount.
612 /// Note that LDK will NOT check that expected fees were factored into this value. You MUST
613 /// check that whatever fee you want has been included here or subtract it as required. Further,
614 /// LDK will not stop you from forwarding more than you received.
615 expected_outbound_amount_msat: u64,
617 /// Used to indicate that an output which you should know how to spend was confirmed on chain
618 /// and is now spendable.
619 /// Such an output will *not* ever be spent by rust-lightning, and are not at risk of your
620 /// counterparty spending them due to some kind of timeout. Thus, you need to store them
621 /// somewhere and spend them when you create on-chain transactions.
623 /// The outputs which you should store as spendable by you.
624 outputs: Vec<SpendableOutputDescriptor>,
626 /// This event is generated when a payment has been successfully forwarded through us and a
627 /// forwarding fee earned.
629 /// The incoming channel between the previous node and us. This is only `None` for events
630 /// generated or serialized by versions prior to 0.0.107.
631 prev_channel_id: Option<[u8; 32]>,
632 /// The outgoing channel between the next node and us. This is only `None` for events
633 /// generated or serialized by versions prior to 0.0.107.
634 next_channel_id: Option<[u8; 32]>,
635 /// The fee, in milli-satoshis, which was earned as a result of the payment.
637 /// Note that if we force-closed the channel over which we forwarded an HTLC while the HTLC
638 /// was pending, the amount the next hop claimed will have been rounded down to the nearest
639 /// whole satoshi. Thus, the fee calculated here may be higher than expected as we still
640 /// claimed the full value in millisatoshis from the source. In this case,
641 /// `claim_from_onchain_tx` will be set.
643 /// If the channel which sent us the payment has been force-closed, we will claim the funds
644 /// via an on-chain transaction. In that case we do not yet know the on-chain transaction
645 /// fees which we will spend and will instead set this to `None`. It is possible duplicate
646 /// `PaymentForwarded` events are generated for the same payment iff `fee_earned_msat` is
648 fee_earned_msat: Option<u64>,
649 /// If this is `true`, the forwarded HTLC was claimed by our counterparty via an on-chain
651 claim_from_onchain_tx: bool,
652 /// The final amount forwarded, in milli-satoshis, after the fee is deducted.
654 /// The caveat described above the `fee_earned_msat` field applies here as well.
655 outbound_amount_forwarded_msat: Option<u64>,
657 /// Used to indicate that a channel with the given `channel_id` is being opened and pending
658 /// confirmation on-chain.
660 /// This event is emitted when the funding transaction has been signed and is broadcast to the
661 /// network. For 0conf channels it will be immediately followed by the corresponding
662 /// [`Event::ChannelReady`] event.
664 /// The `channel_id` of the channel that is pending confirmation.
665 channel_id: [u8; 32],
666 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
667 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
668 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
669 /// `user_channel_id` will be randomized for an inbound channel.
671 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
672 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
673 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
674 user_channel_id: u128,
675 /// The `temporary_channel_id` this channel used to be known by during channel establishment.
677 /// Will be `None` for channels created prior to LDK version 0.0.115.
678 former_temporary_channel_id: Option<[u8; 32]>,
679 /// The `node_id` of the channel counterparty.
680 counterparty_node_id: PublicKey,
681 /// The outpoint of the channel's funding transaction.
682 funding_txo: OutPoint,
684 /// Used to indicate that a channel with the given `channel_id` is ready to
685 /// be used. This event is emitted either when the funding transaction has been confirmed
686 /// on-chain, or, in case of a 0conf channel, when both parties have confirmed the channel
689 /// The `channel_id` of the channel that is ready.
690 channel_id: [u8; 32],
691 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
692 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
693 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
694 /// `user_channel_id` will be randomized for an inbound channel.
696 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
697 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
698 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
699 user_channel_id: u128,
700 /// The `node_id` of the channel counterparty.
701 counterparty_node_id: PublicKey,
702 /// The features that this channel will operate with.
703 channel_type: ChannelTypeFeatures,
705 /// Used to indicate that a previously opened channel with the given `channel_id` is in the
706 /// process of closure.
708 /// The `channel_id` of the channel which has been closed. Note that on-chain transactions
709 /// resolving the channel are likely still awaiting confirmation.
710 channel_id: [u8; 32],
711 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
712 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
713 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
714 /// `user_channel_id` will be randomized for inbound channels.
715 /// This may be zero for inbound channels serialized prior to 0.0.113 and will always be
716 /// zero for objects serialized with LDK versions prior to 0.0.102.
718 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
719 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
720 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
721 user_channel_id: u128,
722 /// The reason the channel was closed.
723 reason: ClosureReason
725 /// Used to indicate to the user that they can abandon the funding transaction and recycle the
726 /// inputs for another purpose.
728 /// The channel_id of the channel which has been closed.
729 channel_id: [u8; 32],
730 /// The full transaction received from the user
731 transaction: Transaction
733 /// Indicates a request to open a new channel by a peer.
735 /// To accept the request, call [`ChannelManager::accept_inbound_channel`]. To reject the
736 /// request, call [`ChannelManager::force_close_without_broadcasting_txn`].
738 /// The event is only triggered when a new open channel request is received and the
739 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true.
741 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
742 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
743 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
745 /// The temporary channel ID of the channel requested to be opened.
747 /// When responding to the request, the `temporary_channel_id` should be passed
748 /// back to the ChannelManager through [`ChannelManager::accept_inbound_channel`] to accept,
749 /// or through [`ChannelManager::force_close_without_broadcasting_txn`] to reject.
751 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
752 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
753 temporary_channel_id: [u8; 32],
754 /// The node_id of the counterparty requesting to open the channel.
756 /// When responding to the request, the `counterparty_node_id` should be passed
757 /// back to the `ChannelManager` through [`ChannelManager::accept_inbound_channel`] to
758 /// accept the request, or through [`ChannelManager::force_close_without_broadcasting_txn`] to reject the
761 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
762 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
763 counterparty_node_id: PublicKey,
764 /// The channel value of the requested channel.
765 funding_satoshis: u64,
766 /// Our starting balance in the channel if the request is accepted, in milli-satoshi.
768 /// The features that this channel will operate with. If you reject the channel, a
769 /// well-behaved counterparty may automatically re-attempt the channel with a new set of
772 /// Note that if [`ChannelTypeFeatures::supports_scid_privacy`] returns true on this type,
773 /// the resulting [`ChannelManager`] will not be readable by versions of LDK prior to
776 /// Furthermore, note that if [`ChannelTypeFeatures::supports_zero_conf`] returns true on this type,
777 /// the resulting [`ChannelManager`] will not be readable by versions of LDK prior to
778 /// 0.0.107. Channels setting this type also need to get manually accepted via
779 /// [`crate::ln::channelmanager::ChannelManager::accept_inbound_channel_from_trusted_peer_0conf`],
780 /// or will be rejected otherwise.
782 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
783 channel_type: ChannelTypeFeatures,
785 /// Indicates that the HTLC was accepted, but could not be processed when or after attempting to
788 /// Some scenarios where this event may be sent include:
789 /// * Insufficient capacity in the outbound channel
790 /// * While waiting to forward the HTLC, the channel it is meant to be forwarded through closes
791 /// * When an unknown SCID is requested for forwarding a payment.
792 /// * Expected MPP amount has already been reached
793 /// * The HTLC has timed out
795 /// This event, however, does not get generated if an HTLC fails to meet the forwarding
796 /// requirements (i.e. insufficient fees paid, or a CLTV that is too soon).
798 /// The channel over which the HTLC was received.
799 prev_channel_id: [u8; 32],
800 /// Destination of the HTLC that failed to be processed.
801 failed_next_destination: HTLCDestination,
804 /// Indicates that a transaction originating from LDK needs to have its fee bumped. This event
805 /// requires confirmed external funds to be readily available to spend.
807 /// LDK does not currently generate this event. It is limited to the scope of channels with
808 /// anchor outputs, which will be introduced in a future release.
809 BumpTransaction(BumpTransactionEvent),
812 impl Writeable for Event {
813 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
815 &Event::FundingGenerationReady { .. } => {
817 // We never write out FundingGenerationReady events as, upon disconnection, peers
818 // drop any channels which have not yet exchanged funding_signed.
820 &Event::PaymentClaimable { ref payment_hash, ref amount_msat, ref purpose, ref receiver_node_id, ref via_channel_id, ref via_user_channel_id, ref claim_deadline } => {
822 let mut payment_secret = None;
823 let payment_preimage;
825 PaymentPurpose::InvoicePayment { payment_preimage: preimage, payment_secret: secret } => {
826 payment_secret = Some(secret);
827 payment_preimage = *preimage;
829 PaymentPurpose::SpontaneousPayment(preimage) => {
830 payment_preimage = Some(*preimage);
833 write_tlv_fields!(writer, {
834 (0, payment_hash, required),
835 (1, receiver_node_id, option),
836 (2, payment_secret, option),
837 (3, via_channel_id, option),
838 (4, amount_msat, required),
839 (5, via_user_channel_id, option),
840 (6, 0u64, required), // user_payment_id required for compatibility with 0.0.103 and earlier
841 (7, claim_deadline, option),
842 (8, payment_preimage, option),
845 &Event::PaymentSent { ref payment_id, ref payment_preimage, ref payment_hash, ref fee_paid_msat } => {
847 write_tlv_fields!(writer, {
848 (0, payment_preimage, required),
849 (1, payment_hash, required),
850 (3, payment_id, option),
851 (5, fee_paid_msat, option),
854 &Event::PaymentPathFailed {
855 ref payment_id, ref payment_hash, ref payment_failed_permanently, ref failure,
856 ref path, ref short_channel_id,
864 error_code.write(writer)?;
866 error_data.write(writer)?;
867 write_tlv_fields!(writer, {
868 (0, payment_hash, required),
869 (1, None::<NetworkUpdate>, option), // network_update in LDK versions prior to 0.0.114
870 (2, payment_failed_permanently, required),
871 (3, false, required), // all_paths_failed in LDK versions prior to 0.0.114
872 (5, *path, vec_type),
873 (7, short_channel_id, option),
874 (9, None::<RouteParameters>, option), // retry in LDK versions prior to 0.0.115
875 (11, payment_id, option),
876 (13, failure, required),
879 &Event::PendingHTLCsForwardable { time_forwardable: _ } => {
881 // Note that we now ignore these on the read end as we'll re-generate them in
882 // ChannelManager, we write them here only for backwards compatibility.
884 &Event::SpendableOutputs { ref outputs } => {
886 write_tlv_fields!(writer, {
887 (0, WithoutLength(outputs), required),
890 &Event::HTLCIntercepted { requested_next_hop_scid, payment_hash, inbound_amount_msat, expected_outbound_amount_msat, intercept_id } => {
892 let intercept_scid = InterceptNextHop::FakeScid { requested_next_hop_scid };
893 write_tlv_fields!(writer, {
894 (0, intercept_id, required),
895 (2, intercept_scid, required),
896 (4, payment_hash, required),
897 (6, inbound_amount_msat, required),
898 (8, expected_outbound_amount_msat, required),
901 &Event::PaymentForwarded {
902 fee_earned_msat, prev_channel_id, claim_from_onchain_tx,
903 next_channel_id, outbound_amount_forwarded_msat
906 write_tlv_fields!(writer, {
907 (0, fee_earned_msat, option),
908 (1, prev_channel_id, option),
909 (2, claim_from_onchain_tx, required),
910 (3, next_channel_id, option),
911 (5, outbound_amount_forwarded_msat, option),
914 &Event::ChannelClosed { ref channel_id, ref user_channel_id, ref reason } => {
916 // `user_channel_id` used to be a single u64 value. In order to remain backwards
917 // compatible with versions prior to 0.0.113, the u128 is serialized as two
918 // separate u64 values.
919 let user_channel_id_low = *user_channel_id as u64;
920 let user_channel_id_high = (*user_channel_id >> 64) as u64;
921 write_tlv_fields!(writer, {
922 (0, channel_id, required),
923 (1, user_channel_id_low, required),
924 (2, reason, required),
925 (3, user_channel_id_high, required),
928 &Event::DiscardFunding { ref channel_id, ref transaction } => {
930 write_tlv_fields!(writer, {
931 (0, channel_id, required),
932 (2, transaction, required)
935 &Event::PaymentPathSuccessful { ref payment_id, ref payment_hash, ref path } => {
937 write_tlv_fields!(writer, {
938 (0, payment_id, required),
939 (2, payment_hash, option),
943 &Event::PaymentFailed { ref payment_id, ref payment_hash } => {
945 write_tlv_fields!(writer, {
946 (0, payment_id, required),
947 (2, payment_hash, required),
950 &Event::OpenChannelRequest { .. } => {
952 // We never write the OpenChannelRequest events as, upon disconnection, peers
953 // drop any channels which have not yet exchanged funding_signed.
955 &Event::PaymentClaimed { ref payment_hash, ref amount_msat, ref purpose, ref receiver_node_id } => {
957 write_tlv_fields!(writer, {
958 (0, payment_hash, required),
959 (1, receiver_node_id, option),
960 (2, purpose, required),
961 (4, amount_msat, required),
964 &Event::ProbeSuccessful { ref payment_id, ref payment_hash, ref path } => {
966 write_tlv_fields!(writer, {
967 (0, payment_id, required),
968 (2, payment_hash, required),
972 &Event::ProbeFailed { ref payment_id, ref payment_hash, ref path, ref short_channel_id } => {
974 write_tlv_fields!(writer, {
975 (0, payment_id, required),
976 (2, payment_hash, required),
977 (4, *path, vec_type),
978 (6, short_channel_id, option),
981 &Event::HTLCHandlingFailed { ref prev_channel_id, ref failed_next_destination } => {
983 write_tlv_fields!(writer, {
984 (0, prev_channel_id, required),
985 (2, failed_next_destination, required),
989 &Event::BumpTransaction(ref event)=> {
992 // We never write the ChannelClose|HTLCResolution events as they'll be replayed
993 // upon restarting anyway if they remain unresolved.
994 BumpTransactionEvent::ChannelClose { .. } => {}
995 BumpTransactionEvent::HTLCResolution { .. } => {}
997 write_tlv_fields!(writer, {}); // Write a length field for forwards compat
999 &Event::ChannelReady { ref channel_id, ref user_channel_id, ref counterparty_node_id, ref channel_type } => {
1000 29u8.write(writer)?;
1001 write_tlv_fields!(writer, {
1002 (0, channel_id, required),
1003 (2, user_channel_id, required),
1004 (4, counterparty_node_id, required),
1005 (6, channel_type, required),
1008 &Event::ChannelPending { ref channel_id, ref user_channel_id, ref former_temporary_channel_id, ref counterparty_node_id, ref funding_txo } => {
1009 31u8.write(writer)?;
1010 write_tlv_fields!(writer, {
1011 (0, channel_id, required),
1012 (2, user_channel_id, required),
1013 (4, former_temporary_channel_id, required),
1014 (6, counterparty_node_id, required),
1015 (8, funding_txo, required),
1018 // Note that, going forward, all new events must only write data inside of
1019 // `write_tlv_fields`. Versions 0.0.101+ will ignore odd-numbered events that write
1020 // data via `write_tlv_fields`.
1025 impl MaybeReadable for Event {
1026 fn read<R: io::Read>(reader: &mut R) -> Result<Option<Self>, msgs::DecodeError> {
1027 match Readable::read(reader)? {
1028 // Note that we do not write a length-prefixed TLV for FundingGenerationReady events,
1029 // unlike all other events, thus we return immediately here.
1033 let mut payment_hash = PaymentHash([0; 32]);
1034 let mut payment_preimage = None;
1035 let mut payment_secret = None;
1036 let mut amount_msat = 0;
1037 let mut receiver_node_id = None;
1038 let mut _user_payment_id = None::<u64>; // For compatibility with 0.0.103 and earlier
1039 let mut via_channel_id = None;
1040 let mut claim_deadline = None;
1041 let mut via_user_channel_id = None;
1042 read_tlv_fields!(reader, {
1043 (0, payment_hash, required),
1044 (1, receiver_node_id, option),
1045 (2, payment_secret, option),
1046 (3, via_channel_id, option),
1047 (4, amount_msat, required),
1048 (5, via_user_channel_id, option),
1049 (6, _user_payment_id, option),
1050 (7, claim_deadline, option),
1051 (8, payment_preimage, option),
1053 let purpose = match payment_secret {
1054 Some(secret) => PaymentPurpose::InvoicePayment {
1056 payment_secret: secret
1058 None if payment_preimage.is_some() => PaymentPurpose::SpontaneousPayment(payment_preimage.unwrap()),
1059 None => return Err(msgs::DecodeError::InvalidValue),
1061 Ok(Some(Event::PaymentClaimable {
1067 via_user_channel_id,
1075 let mut payment_preimage = PaymentPreimage([0; 32]);
1076 let mut payment_hash = None;
1077 let mut payment_id = None;
1078 let mut fee_paid_msat = None;
1079 read_tlv_fields!(reader, {
1080 (0, payment_preimage, required),
1081 (1, payment_hash, option),
1082 (3, payment_id, option),
1083 (5, fee_paid_msat, option),
1085 if payment_hash.is_none() {
1086 payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0[..]).into_inner()));
1088 Ok(Some(Event::PaymentSent {
1091 payment_hash: payment_hash.unwrap(),
1100 let error_code = Readable::read(reader)?;
1102 let error_data = Readable::read(reader)?;
1103 let mut payment_hash = PaymentHash([0; 32]);
1104 let mut payment_failed_permanently = false;
1105 let mut network_update = None;
1106 let mut path: Option<Vec<RouteHop>> = Some(vec![]);
1107 let mut short_channel_id = None;
1108 let mut payment_id = None;
1109 let mut failure_opt = None;
1110 read_tlv_fields!(reader, {
1111 (0, payment_hash, required),
1112 (1, network_update, upgradable_option),
1113 (2, payment_failed_permanently, required),
1114 (5, path, vec_type),
1115 (7, short_channel_id, option),
1116 (11, payment_id, option),
1117 (13, failure_opt, upgradable_option),
1119 let failure = failure_opt.unwrap_or_else(|| PathFailure::OnPath { network_update });
1120 Ok(Some(Event::PaymentPathFailed {
1123 payment_failed_permanently,
1125 path: path.unwrap(),
1138 let mut outputs = WithoutLength(Vec::new());
1139 read_tlv_fields!(reader, {
1140 (0, outputs, required),
1142 Ok(Some(Event::SpendableOutputs { outputs: outputs.0 }))
1147 let mut payment_hash = PaymentHash([0; 32]);
1148 let mut intercept_id = InterceptId([0; 32]);
1149 let mut requested_next_hop_scid = InterceptNextHop::FakeScid { requested_next_hop_scid: 0 };
1150 let mut inbound_amount_msat = 0;
1151 let mut expected_outbound_amount_msat = 0;
1152 read_tlv_fields!(reader, {
1153 (0, intercept_id, required),
1154 (2, requested_next_hop_scid, required),
1155 (4, payment_hash, required),
1156 (6, inbound_amount_msat, required),
1157 (8, expected_outbound_amount_msat, required),
1159 let next_scid = match requested_next_hop_scid {
1160 InterceptNextHop::FakeScid { requested_next_hop_scid: scid } => scid
1162 Ok(Some(Event::HTLCIntercepted {
1164 requested_next_hop_scid: next_scid,
1165 inbound_amount_msat,
1166 expected_outbound_amount_msat,
1172 let mut fee_earned_msat = None;
1173 let mut prev_channel_id = None;
1174 let mut claim_from_onchain_tx = false;
1175 let mut next_channel_id = None;
1176 let mut outbound_amount_forwarded_msat = None;
1177 read_tlv_fields!(reader, {
1178 (0, fee_earned_msat, option),
1179 (1, prev_channel_id, option),
1180 (2, claim_from_onchain_tx, required),
1181 (3, next_channel_id, option),
1182 (5, outbound_amount_forwarded_msat, option),
1184 Ok(Some(Event::PaymentForwarded {
1185 fee_earned_msat, prev_channel_id, claim_from_onchain_tx, next_channel_id,
1186 outbound_amount_forwarded_msat
1193 let mut channel_id = [0; 32];
1194 let mut reason = UpgradableRequired(None);
1195 let mut user_channel_id_low_opt: Option<u64> = None;
1196 let mut user_channel_id_high_opt: Option<u64> = None;
1197 read_tlv_fields!(reader, {
1198 (0, channel_id, required),
1199 (1, user_channel_id_low_opt, option),
1200 (2, reason, upgradable_required),
1201 (3, user_channel_id_high_opt, option),
1204 // `user_channel_id` used to be a single u64 value. In order to remain
1205 // backwards compatible with versions prior to 0.0.113, the u128 is serialized
1206 // as two separate u64 values.
1207 let user_channel_id = (user_channel_id_low_opt.unwrap_or(0) as u128) +
1208 ((user_channel_id_high_opt.unwrap_or(0) as u128) << 64);
1210 Ok(Some(Event::ChannelClosed { channel_id, user_channel_id, reason: _init_tlv_based_struct_field!(reason, upgradable_required) }))
1216 let mut channel_id = [0; 32];
1217 let mut transaction = Transaction{ version: 2, lock_time: PackedLockTime::ZERO, input: Vec::new(), output: Vec::new() };
1218 read_tlv_fields!(reader, {
1219 (0, channel_id, required),
1220 (2, transaction, required),
1222 Ok(Some(Event::DiscardFunding { channel_id, transaction } ))
1228 let mut payment_id = PaymentId([0; 32]);
1229 let mut payment_hash = None;
1230 let mut path: Option<Vec<RouteHop>> = Some(vec![]);
1231 read_tlv_fields!(reader, {
1232 (0, payment_id, required),
1233 (2, payment_hash, option),
1234 (4, path, vec_type),
1236 Ok(Some(Event::PaymentPathSuccessful {
1239 path: path.unwrap(),
1246 let mut payment_hash = PaymentHash([0; 32]);
1247 let mut payment_id = PaymentId([0; 32]);
1248 read_tlv_fields!(reader, {
1249 (0, payment_id, required),
1250 (2, payment_hash, required),
1252 Ok(Some(Event::PaymentFailed {
1260 // Value 17 is used for `Event::OpenChannelRequest`.
1265 let mut payment_hash = PaymentHash([0; 32]);
1266 let mut purpose = UpgradableRequired(None);
1267 let mut amount_msat = 0;
1268 let mut receiver_node_id = None;
1269 read_tlv_fields!(reader, {
1270 (0, payment_hash, required),
1271 (1, receiver_node_id, option),
1272 (2, purpose, upgradable_required),
1273 (4, amount_msat, required),
1275 Ok(Some(Event::PaymentClaimed {
1278 purpose: _init_tlv_based_struct_field!(purpose, upgradable_required),
1286 let mut payment_id = PaymentId([0; 32]);
1287 let mut payment_hash = PaymentHash([0; 32]);
1288 let mut path: Option<Vec<RouteHop>> = Some(vec![]);
1289 read_tlv_fields!(reader, {
1290 (0, payment_id, required),
1291 (2, payment_hash, required),
1292 (4, path, vec_type),
1294 Ok(Some(Event::ProbeSuccessful {
1297 path: path.unwrap(),
1304 let mut payment_id = PaymentId([0; 32]);
1305 let mut payment_hash = PaymentHash([0; 32]);
1306 let mut path: Option<Vec<RouteHop>> = Some(vec![]);
1307 let mut short_channel_id = None;
1308 read_tlv_fields!(reader, {
1309 (0, payment_id, required),
1310 (2, payment_hash, required),
1311 (4, path, vec_type),
1312 (6, short_channel_id, option),
1314 Ok(Some(Event::ProbeFailed {
1317 path: path.unwrap(),
1325 let mut prev_channel_id = [0; 32];
1326 let mut failed_next_destination_opt = UpgradableRequired(None);
1327 read_tlv_fields!(reader, {
1328 (0, prev_channel_id, required),
1329 (2, failed_next_destination_opt, upgradable_required),
1331 Ok(Some(Event::HTLCHandlingFailed {
1333 failed_next_destination: _init_tlv_based_struct_field!(failed_next_destination_opt, upgradable_required),
1341 let mut channel_id = [0; 32];
1342 let mut user_channel_id: u128 = 0;
1343 let mut counterparty_node_id = RequiredWrapper(None);
1344 let mut channel_type = RequiredWrapper(None);
1345 read_tlv_fields!(reader, {
1346 (0, channel_id, required),
1347 (2, user_channel_id, required),
1348 (4, counterparty_node_id, required),
1349 (6, channel_type, required),
1352 Ok(Some(Event::ChannelReady {
1355 counterparty_node_id: counterparty_node_id.0.unwrap(),
1356 channel_type: channel_type.0.unwrap()
1363 let mut channel_id = [0; 32];
1364 let mut user_channel_id: u128 = 0;
1365 let mut former_temporary_channel_id = None;
1366 let mut counterparty_node_id = RequiredWrapper(None);
1367 let mut funding_txo = RequiredWrapper(None);
1368 read_tlv_fields!(reader, {
1369 (0, channel_id, required),
1370 (2, user_channel_id, required),
1371 (4, former_temporary_channel_id, required),
1372 (6, counterparty_node_id, required),
1373 (8, funding_txo, required),
1376 Ok(Some(Event::ChannelPending {
1379 former_temporary_channel_id,
1380 counterparty_node_id: counterparty_node_id.0.unwrap(),
1381 funding_txo: funding_txo.0.unwrap()
1386 // Versions prior to 0.0.100 did not ignore odd types, instead returning InvalidValue.
1387 // Version 0.0.100 failed to properly ignore odd types, possibly resulting in corrupt
1389 x if x % 2 == 1 => {
1390 // If the event is of unknown type, assume it was written with `write_tlv_fields`,
1391 // which prefixes the whole thing with a length BigSize. Because the event is
1392 // odd-type unknown, we should treat it as `Ok(None)` even if it has some TLV
1393 // fields that are even. Thus, we avoid using `read_tlv_fields` and simply read
1394 // exactly the number of bytes specified, ignoring them entirely.
1395 let tlv_len: BigSize = Readable::read(reader)?;
1396 FixedLengthReader::new(reader, tlv_len.0)
1397 .eat_remaining().map_err(|_| msgs::DecodeError::ShortRead)?;
1400 _ => Err(msgs::DecodeError::InvalidValue)
1405 /// An event generated by ChannelManager which indicates a message should be sent to a peer (or
1406 /// broadcast to most peers).
1407 /// These events are handled by PeerManager::process_events if you are using a PeerManager.
1408 #[derive(Clone, Debug)]
1409 pub enum MessageSendEvent {
1410 /// Used to indicate that we've accepted a channel open and should send the accept_channel
1411 /// message provided to the given peer.
1413 /// The node_id of the node which should receive this message
1415 /// The message which should be sent.
1416 msg: msgs::AcceptChannel,
1418 /// Used to indicate that we've initiated a channel open and should send the open_channel
1419 /// message provided to the given peer.
1421 /// The node_id of the node which should receive this message
1423 /// The message which should be sent.
1424 msg: msgs::OpenChannel,
1426 /// Used to indicate that a funding_created message should be sent to the peer with the given node_id.
1427 SendFundingCreated {
1428 /// The node_id of the node which should receive this message
1430 /// The message which should be sent.
1431 msg: msgs::FundingCreated,
1433 /// Used to indicate that a funding_signed message should be sent to the peer with the given node_id.
1435 /// The node_id of the node which should receive this message
1437 /// The message which should be sent.
1438 msg: msgs::FundingSigned,
1440 /// Used to indicate that a channel_ready message should be sent to the peer with the given node_id.
1442 /// The node_id of the node which should receive these message(s)
1444 /// The channel_ready message which should be sent.
1445 msg: msgs::ChannelReady,
1447 /// Used to indicate that an announcement_signatures message should be sent to the peer with the given node_id.
1448 SendAnnouncementSignatures {
1449 /// The node_id of the node which should receive these message(s)
1451 /// The announcement_signatures message which should be sent.
1452 msg: msgs::AnnouncementSignatures,
1454 /// Used to indicate that a series of HTLC update messages, as well as a commitment_signed
1455 /// message should be sent to the peer with the given node_id.
1457 /// The node_id of the node which should receive these message(s)
1459 /// The update messages which should be sent. ALL messages in the struct should be sent!
1460 updates: msgs::CommitmentUpdate,
1462 /// Used to indicate that a revoke_and_ack message should be sent to the peer with the given node_id.
1464 /// The node_id of the node which should receive this message
1466 /// The message which should be sent.
1467 msg: msgs::RevokeAndACK,
1469 /// Used to indicate that a closing_signed message should be sent to the peer with the given node_id.
1471 /// The node_id of the node which should receive this message
1473 /// The message which should be sent.
1474 msg: msgs::ClosingSigned,
1476 /// Used to indicate that a shutdown message should be sent to the peer with the given node_id.
1478 /// The node_id of the node which should receive this message
1480 /// The message which should be sent.
1481 msg: msgs::Shutdown,
1483 /// Used to indicate that a channel_reestablish message should be sent to the peer with the given node_id.
1484 SendChannelReestablish {
1485 /// The node_id of the node which should receive this message
1487 /// The message which should be sent.
1488 msg: msgs::ChannelReestablish,
1490 /// Used to send a channel_announcement and channel_update to a specific peer, likely on
1491 /// initial connection to ensure our peers know about our channels.
1492 SendChannelAnnouncement {
1493 /// The node_id of the node which should receive this message
1495 /// The channel_announcement which should be sent.
1496 msg: msgs::ChannelAnnouncement,
1497 /// The followup channel_update which should be sent.
1498 update_msg: msgs::ChannelUpdate,
1500 /// Used to indicate that a channel_announcement and channel_update should be broadcast to all
1501 /// peers (except the peer with node_id either msg.contents.node_id_1 or msg.contents.node_id_2).
1503 /// Note that after doing so, you very likely (unless you did so very recently) want to
1504 /// broadcast a node_announcement (e.g. via [`PeerManager::broadcast_node_announcement`]). This
1505 /// ensures that any nodes which see our channel_announcement also have a relevant
1506 /// node_announcement, including relevant feature flags which may be important for routing
1507 /// through or to us.
1509 /// [`PeerManager::broadcast_node_announcement`]: crate::ln::peer_handler::PeerManager::broadcast_node_announcement
1510 BroadcastChannelAnnouncement {
1511 /// The channel_announcement which should be sent.
1512 msg: msgs::ChannelAnnouncement,
1513 /// The followup channel_update which should be sent.
1514 update_msg: Option<msgs::ChannelUpdate>,
1516 /// Used to indicate that a channel_update should be broadcast to all peers.
1517 BroadcastChannelUpdate {
1518 /// The channel_update which should be sent.
1519 msg: msgs::ChannelUpdate,
1521 /// Used to indicate that a node_announcement should be broadcast to all peers.
1522 BroadcastNodeAnnouncement {
1523 /// The node_announcement which should be sent.
1524 msg: msgs::NodeAnnouncement,
1526 /// Used to indicate that a channel_update should be sent to a single peer.
1527 /// In contrast to [`Self::BroadcastChannelUpdate`], this is used when the channel is a
1528 /// private channel and we shouldn't be informing all of our peers of channel parameters.
1530 /// The node_id of the node which should receive this message
1532 /// The channel_update which should be sent.
1533 msg: msgs::ChannelUpdate,
1535 /// Broadcast an error downstream to be handled
1537 /// The node_id of the node which should receive this message
1539 /// The action which should be taken.
1540 action: msgs::ErrorAction
1542 /// Query a peer for channels with funding transaction UTXOs in a block range.
1543 SendChannelRangeQuery {
1544 /// The node_id of this message recipient
1546 /// The query_channel_range which should be sent.
1547 msg: msgs::QueryChannelRange,
1549 /// Request routing gossip messages from a peer for a list of channels identified by
1550 /// their short_channel_ids.
1552 /// The node_id of this message recipient
1554 /// The query_short_channel_ids which should be sent.
1555 msg: msgs::QueryShortChannelIds,
1557 /// Sends a reply to a channel range query. This may be one of several SendReplyChannelRange events
1558 /// emitted during processing of the query.
1559 SendReplyChannelRange {
1560 /// The node_id of this message recipient
1562 /// The reply_channel_range which should be sent.
1563 msg: msgs::ReplyChannelRange,
1565 /// Sends a timestamp filter for inbound gossip. This should be sent on each new connection to
1566 /// enable receiving gossip messages from the peer.
1567 SendGossipTimestampFilter {
1568 /// The node_id of this message recipient
1570 /// The gossip_timestamp_filter which should be sent.
1571 msg: msgs::GossipTimestampFilter,
1575 /// A trait indicating an object may generate message send events
1576 pub trait MessageSendEventsProvider {
1577 /// Gets the list of pending events which were generated by previous actions, clearing the list
1579 fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent>;
1582 /// A trait indicating an object may generate onion messages to send
1583 pub trait OnionMessageProvider {
1584 /// Gets the next pending onion message for the peer with the given node id.
1585 fn next_onion_message_for_peer(&self, peer_node_id: PublicKey) -> Option<msgs::OnionMessage>;
1588 /// A trait indicating an object may generate events.
1590 /// Events are processed by passing an [`EventHandler`] to [`process_pending_events`].
1592 /// Implementations of this trait may also feature an async version of event handling, as shown with
1593 /// [`ChannelManager::process_pending_events_async`] and
1594 /// [`ChainMonitor::process_pending_events_async`].
1598 /// When using this trait, [`process_pending_events`] will call [`handle_event`] for each pending
1599 /// event since the last invocation.
1601 /// In order to ensure no [`Event`]s are lost, implementors of this trait will persist [`Event`]s
1602 /// and replay any unhandled events on startup. An [`Event`] is considered handled when
1603 /// [`process_pending_events`] returns, thus handlers MUST fully handle [`Event`]s and persist any
1604 /// relevant changes to disk *before* returning.
1606 /// Further, because an application may crash between an [`Event`] being handled and the
1607 /// implementor of this trait being re-serialized, [`Event`] handling must be idempotent - in
1608 /// effect, [`Event`]s may be replayed.
1610 /// Note, handlers may call back into the provider and thus deadlocking must be avoided. Be sure to
1611 /// consult the provider's documentation on the implication of processing events and how a handler
1612 /// may safely use the provider (e.g., see [`ChannelManager::process_pending_events`] and
1613 /// [`ChainMonitor::process_pending_events`]).
1615 /// (C-not implementable) As there is likely no reason for a user to implement this trait on their
1618 /// [`process_pending_events`]: Self::process_pending_events
1619 /// [`handle_event`]: EventHandler::handle_event
1620 /// [`ChannelManager::process_pending_events`]: crate::ln::channelmanager::ChannelManager#method.process_pending_events
1621 /// [`ChainMonitor::process_pending_events`]: crate::chain::chainmonitor::ChainMonitor#method.process_pending_events
1622 /// [`ChannelManager::process_pending_events_async`]: crate::ln::channelmanager::ChannelManager::process_pending_events_async
1623 /// [`ChainMonitor::process_pending_events_async`]: crate::chain::chainmonitor::ChainMonitor::process_pending_events_async
1624 pub trait EventsProvider {
1625 /// Processes any events generated since the last call using the given event handler.
1627 /// See the trait-level documentation for requirements.
1628 fn process_pending_events<H: Deref>(&self, handler: H) where H::Target: EventHandler;
1631 /// A trait implemented for objects handling events from [`EventsProvider`].
1633 /// An async variation also exists for implementations of [`EventsProvider`] that support async
1634 /// event handling. The async event handler should satisfy the generic bounds: `F:
1635 /// core::future::Future, H: Fn(Event) -> F`.
1636 pub trait EventHandler {
1637 /// Handles the given [`Event`].
1639 /// See [`EventsProvider`] for details that must be considered when implementing this method.
1640 fn handle_event(&self, event: Event);
1643 impl<F> EventHandler for F where F: Fn(Event) {
1644 fn handle_event(&self, event: Event) {
1649 impl<T: EventHandler> EventHandler for Arc<T> {
1650 fn handle_event(&self, event: Event) {
1651 self.deref().handle_event(event)