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, RecipientOnionFields};
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 /// * Excess HTLCs for a payment that we have already fully received, over-paying for the
237 /// * The counterparty node modified the HTLC in transit,
238 /// * A probing attack where an intermediary node is trying to detect if we are the ultimate
239 /// recipient for a payment.
241 /// The payment hash of the payment we attempted to process.
242 payment_hash: PaymentHash
246 impl_writeable_tlv_based_enum_upgradable!(HTLCDestination,
247 (0, NextHopChannel) => {
248 (0, node_id, required),
249 (2, channel_id, required),
251 (1, InvalidForward) => {
252 (0, requested_forward_scid, required),
254 (2, UnknownNextHop) => {
255 (0, requested_forward_scid, required),
257 (4, FailedPayment) => {
258 (0, payment_hash, required),
262 /// Will be used in [`Event::HTLCIntercepted`] to identify the next hop in the HTLC's path.
263 /// Currently only used in serialization for the sake of maintaining compatibility. More variants
264 /// will be added for general-purpose HTLC forward intercepts as well as trampoline forward
265 /// intercepts in upcoming work.
266 enum InterceptNextHop {
268 requested_next_hop_scid: u64,
272 impl_writeable_tlv_based_enum!(InterceptNextHop,
274 (0, requested_next_hop_scid, required),
278 /// The reason the payment failed. Used in [`Event::PaymentFailed`].
279 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
280 pub enum PaymentFailureReason {
281 /// The intended recipient rejected our payment.
283 /// The user chose to abandon this payment by calling [`ChannelManager::abandon_payment`].
285 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
287 /// We exhausted all of our retry attempts while trying to send the payment, or we
288 /// exhausted the [`Retry::Timeout`] if the user set one. If at any point a retry
289 /// attempt failed while being forwarded along the path, an [`Event::PaymentPathFailed`] will
290 /// have come before this.
292 /// [`Retry::Timeout`]: crate::ln::channelmanager::Retry::Timeout
294 /// The payment expired while retrying, based on the provided
295 /// [`PaymentParameters::expiry_time`].
297 /// [`PaymentParameters::expiry_time`]: crate::routing::router::PaymentParameters::expiry_time
299 /// We failed to find a route while retrying the payment.
301 /// This error should generally never happen. This likely means that there is a problem with
306 impl_writeable_tlv_based_enum!(PaymentFailureReason,
307 (0, RecipientRejected) => {},
308 (2, UserAbandoned) => {},
309 (4, RetriesExhausted) => {},
310 (6, PaymentExpired) => {},
311 (8, RouteNotFound) => {},
312 (10, UnexpectedError) => {}, ;
315 /// An Event which you should probably take some action in response to.
317 /// Note that while Writeable and Readable are implemented for Event, you probably shouldn't use
318 /// them directly as they don't round-trip exactly (for example FundingGenerationReady is never
319 /// written as it makes no sense to respond to it after reconnecting to peers).
320 #[derive(Clone, Debug, PartialEq, Eq)]
322 /// Used to indicate that the client should generate a funding transaction with the given
323 /// parameters and then call [`ChannelManager::funding_transaction_generated`].
324 /// Generated in [`ChannelManager`] message handling.
325 /// Note that *all inputs* in the funding transaction must spend SegWit outputs or your
326 /// counterparty can steal your funds!
328 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
329 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
330 FundingGenerationReady {
331 /// The random channel_id we picked which you'll need to pass into
332 /// [`ChannelManager::funding_transaction_generated`].
334 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
335 temporary_channel_id: [u8; 32],
336 /// The counterparty's node_id, which you'll need to pass back into
337 /// [`ChannelManager::funding_transaction_generated`].
339 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
340 counterparty_node_id: PublicKey,
341 /// The value, in satoshis, that the output should have.
342 channel_value_satoshis: u64,
343 /// The script which should be used in the transaction output.
344 output_script: Script,
345 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`], or a
346 /// random value for an inbound channel. This may be zero for objects serialized with LDK
347 /// versions prior to 0.0.113.
349 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
350 user_channel_id: u128,
352 /// Indicates that we've been offered a payment and it needs to be claimed via calling
353 /// [`ChannelManager::claim_funds`] with the preimage given in [`PaymentPurpose`].
355 /// Note that if the preimage is not known, you should call
356 /// [`ChannelManager::fail_htlc_backwards`] or [`ChannelManager::fail_htlc_backwards_with_reason`]
357 /// to free up resources for this HTLC and avoid network congestion.
358 /// If you fail to call either [`ChannelManager::claim_funds`], [`ChannelManager::fail_htlc_backwards`],
359 /// or [`ChannelManager::fail_htlc_backwards_with_reason`] within the HTLC's timeout, the HTLC will be
360 /// automatically failed.
363 /// LDK will not stop an inbound payment from being paid multiple times, so multiple
364 /// `PaymentClaimable` events may be generated for the same payment. In such a case it is
365 /// polite (and required in the lightning specification) to fail the payment the second time
366 /// and give the sender their money back rather than accepting double payment.
369 /// This event used to be called `PaymentReceived` in LDK versions 0.0.112 and earlier.
371 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
372 /// [`ChannelManager::fail_htlc_backwards`]: crate::ln::channelmanager::ChannelManager::fail_htlc_backwards
373 /// [`ChannelManager::fail_htlc_backwards_with_reason`]: crate::ln::channelmanager::ChannelManager::fail_htlc_backwards_with_reason
375 /// The node that will receive the payment after it has been claimed.
376 /// This is useful to identify payments received via [phantom nodes].
377 /// This field will always be filled in when the event was generated by LDK versions
378 /// 0.0.113 and above.
380 /// [phantom nodes]: crate::chain::keysinterface::PhantomKeysManager
381 receiver_node_id: Option<PublicKey>,
382 /// The hash for which the preimage should be handed to the ChannelManager. Note that LDK will
383 /// not stop you from registering duplicate payment hashes for inbound payments.
384 payment_hash: PaymentHash,
385 /// The fields in the onion which were received with each HTLC. Only fields which were
386 /// identical in each HTLC involved in the payment will be included here.
388 /// Payments received on LDK versions prior to 0.0.115 will have this field unset.
389 onion_fields: Option<RecipientOnionFields>,
390 /// The value, in thousandths of a satoshi, that this payment is for.
392 /// Information for claiming this received payment, based on whether the purpose of the
393 /// payment is to pay an invoice or to send a spontaneous payment.
394 purpose: PaymentPurpose,
395 /// The `channel_id` indicating over which channel we received the payment.
396 via_channel_id: Option<[u8; 32]>,
397 /// The `user_channel_id` indicating over which channel we received the payment.
398 via_user_channel_id: Option<u128>,
399 /// The block height at which this payment will be failed back and will no longer be
400 /// eligible for claiming.
402 /// Prior to this height, a call to [`ChannelManager::claim_funds`] is guaranteed to
403 /// succeed, however you should wait for [`Event::PaymentClaimed`] to be sure.
405 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
406 claim_deadline: Option<u32>,
408 /// Indicates a payment has been claimed and we've received money!
410 /// This most likely occurs when [`ChannelManager::claim_funds`] has been called in response
411 /// to an [`Event::PaymentClaimable`]. However, if we previously crashed during a
412 /// [`ChannelManager::claim_funds`] call you may see this event without a corresponding
413 /// [`Event::PaymentClaimable`] event.
416 /// LDK will not stop an inbound payment from being paid multiple times, so multiple
417 /// `PaymentClaimable` events may be generated for the same payment. If you then call
418 /// [`ChannelManager::claim_funds`] twice for the same [`Event::PaymentClaimable`] you may get
419 /// multiple `PaymentClaimed` events.
421 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
423 /// The node that received the payment.
424 /// This is useful to identify payments which were received via [phantom nodes].
425 /// This field will always be filled in when the event was generated by LDK versions
426 /// 0.0.113 and above.
428 /// [phantom nodes]: crate::chain::keysinterface::PhantomKeysManager
429 receiver_node_id: Option<PublicKey>,
430 /// The payment hash of the claimed payment. Note that LDK will not stop you from
431 /// registering duplicate payment hashes for inbound payments.
432 payment_hash: PaymentHash,
433 /// The value, in thousandths of a satoshi, that this payment is for.
435 /// The purpose of the claimed payment, i.e. whether the payment was for an invoice or a
436 /// spontaneous payment.
437 purpose: PaymentPurpose,
439 /// Indicates an outbound payment we made succeeded (i.e. it made it all the way to its target
440 /// and we got back the payment preimage for it).
442 /// Note for MPP payments: in rare cases, this event may be preceded by a `PaymentPathFailed`
443 /// event. In this situation, you SHOULD treat this payment as having succeeded.
445 /// The `payment_id` passed to [`ChannelManager::send_payment`].
447 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
448 payment_id: Option<PaymentId>,
449 /// The preimage to the hash given to ChannelManager::send_payment.
450 /// Note that this serves as a payment receipt, if you wish to have such a thing, you must
451 /// store it somehow!
452 payment_preimage: PaymentPreimage,
453 /// The hash that was given to [`ChannelManager::send_payment`].
455 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
456 payment_hash: PaymentHash,
457 /// The total fee which was spent at intermediate hops in this payment, across all paths.
459 /// Note that, like [`Route::get_total_fees`] this does *not* include any potential
460 /// overpayment to the recipient node.
462 /// If the recipient or an intermediate node misbehaves and gives us free money, this may
463 /// overstate the amount paid, though this is unlikely.
465 /// [`Route::get_total_fees`]: crate::routing::router::Route::get_total_fees
466 fee_paid_msat: Option<u64>,
468 /// Indicates an outbound payment failed. Individual [`Event::PaymentPathFailed`] events
469 /// provide failure information for each path attempt in the payment, including retries.
471 /// This event is provided once there are no further pending HTLCs for the payment and the
472 /// payment is no longer retryable, due either to the [`Retry`] provided or
473 /// [`ChannelManager::abandon_payment`] having been called for the corresponding payment.
475 /// [`Retry`]: crate::ln::channelmanager::Retry
476 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
478 /// The `payment_id` passed to [`ChannelManager::send_payment`].
480 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
481 payment_id: PaymentId,
482 /// The hash that was given to [`ChannelManager::send_payment`].
484 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
485 payment_hash: PaymentHash,
486 /// The reason the payment failed. This is only `None` for events generated or serialized
487 /// by versions prior to 0.0.115.
488 reason: Option<PaymentFailureReason>,
490 /// Indicates that a path for an outbound payment was successful.
492 /// Always generated after [`Event::PaymentSent`] and thus useful for scoring channels. See
493 /// [`Event::PaymentSent`] for obtaining the payment preimage.
494 PaymentPathSuccessful {
495 /// The `payment_id` passed to [`ChannelManager::send_payment`].
497 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
498 payment_id: PaymentId,
499 /// The hash that was given to [`ChannelManager::send_payment`].
501 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
502 payment_hash: Option<PaymentHash>,
503 /// The payment path that was successful.
505 /// May contain a closed channel if the HTLC sent along the path was fulfilled on chain.
508 /// Indicates an outbound HTLC we sent failed, likely due to an intermediary node being unable to
511 /// Note that this does *not* indicate that all paths for an MPP payment have failed, see
512 /// [`Event::PaymentFailed`].
514 /// See [`ChannelManager::abandon_payment`] for giving up on this payment before its retries have
517 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
519 /// The `payment_id` passed to [`ChannelManager::send_payment`].
521 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
522 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
523 payment_id: Option<PaymentId>,
524 /// The hash that was given to [`ChannelManager::send_payment`].
526 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
527 payment_hash: PaymentHash,
528 /// Indicates the payment was rejected for some reason by the recipient. This implies that
529 /// the payment has failed, not just the route in question. If this is not set, the payment may
530 /// be retried via a different route.
531 payment_failed_permanently: bool,
532 /// Extra error details based on the failure type. May contain an update that needs to be
533 /// applied to the [`NetworkGraph`].
535 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
536 failure: PathFailure,
537 /// The payment path that failed.
539 /// The channel responsible for the failed payment path.
541 /// Note that for route hints or for the first hop in a path this may be an SCID alias and
542 /// may not refer to a channel in the public network graph. These aliases may also collide
543 /// with channels in the public network graph.
545 /// If this is `Some`, then the corresponding channel should be avoided when the payment is
546 /// retried. May be `None` for older [`Event`] serializations.
547 short_channel_id: Option<u64>,
549 error_code: Option<u16>,
551 error_data: Option<Vec<u8>>,
553 /// Indicates that a probe payment we sent returned successful, i.e., only failed at the destination.
555 /// The id returned by [`ChannelManager::send_probe`].
557 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
558 payment_id: PaymentId,
559 /// The hash generated by [`ChannelManager::send_probe`].
561 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
562 payment_hash: PaymentHash,
563 /// The payment path that was successful.
566 /// Indicates that a probe payment we sent failed at an intermediary node on the path.
568 /// The id returned by [`ChannelManager::send_probe`].
570 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
571 payment_id: PaymentId,
572 /// The hash generated by [`ChannelManager::send_probe`].
574 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
575 payment_hash: PaymentHash,
576 /// The payment path that failed.
578 /// The channel responsible for the failed probe.
580 /// Note that for route hints or for the first hop in a path this may be an SCID alias and
581 /// may not refer to a channel in the public network graph. These aliases may also collide
582 /// with channels in the public network graph.
583 short_channel_id: Option<u64>,
585 /// Used to indicate that [`ChannelManager::process_pending_htlc_forwards`] should be called at
586 /// a time in the future.
588 /// [`ChannelManager::process_pending_htlc_forwards`]: crate::ln::channelmanager::ChannelManager::process_pending_htlc_forwards
589 PendingHTLCsForwardable {
590 /// The minimum amount of time that should be waited prior to calling
591 /// process_pending_htlc_forwards. To increase the effort required to correlate payments,
592 /// you should wait a random amount of time in roughly the range (now + time_forwardable,
593 /// now + 5*time_forwardable).
594 time_forwardable: Duration,
596 /// Used to indicate that we've intercepted an HTLC forward. This event will only be generated if
597 /// you've encoded an intercept scid in the receiver's invoice route hints using
598 /// [`ChannelManager::get_intercept_scid`] and have set [`UserConfig::accept_intercept_htlcs`].
600 /// [`ChannelManager::forward_intercepted_htlc`] or
601 /// [`ChannelManager::fail_intercepted_htlc`] MUST be called in response to this event. See
602 /// their docs for more information.
604 /// [`ChannelManager::get_intercept_scid`]: crate::ln::channelmanager::ChannelManager::get_intercept_scid
605 /// [`UserConfig::accept_intercept_htlcs`]: crate::util::config::UserConfig::accept_intercept_htlcs
606 /// [`ChannelManager::forward_intercepted_htlc`]: crate::ln::channelmanager::ChannelManager::forward_intercepted_htlc
607 /// [`ChannelManager::fail_intercepted_htlc`]: crate::ln::channelmanager::ChannelManager::fail_intercepted_htlc
609 /// An id to help LDK identify which HTLC is being forwarded or failed.
610 intercept_id: InterceptId,
611 /// The fake scid that was programmed as the next hop's scid, generated using
612 /// [`ChannelManager::get_intercept_scid`].
614 /// [`ChannelManager::get_intercept_scid`]: crate::ln::channelmanager::ChannelManager::get_intercept_scid
615 requested_next_hop_scid: u64,
616 /// The payment hash used for this HTLC.
617 payment_hash: PaymentHash,
618 /// How many msats were received on the inbound edge of this HTLC.
619 inbound_amount_msat: u64,
620 /// How many msats the payer intended to route to the next node. Depending on the reason you are
621 /// intercepting this payment, you might take a fee by forwarding less than this amount.
623 /// Note that LDK will NOT check that expected fees were factored into this value. You MUST
624 /// check that whatever fee you want has been included here or subtract it as required. Further,
625 /// LDK will not stop you from forwarding more than you received.
626 expected_outbound_amount_msat: u64,
628 /// Used to indicate that an output which you should know how to spend was confirmed on chain
629 /// and is now spendable.
630 /// Such an output will *not* ever be spent by rust-lightning, and are not at risk of your
631 /// counterparty spending them due to some kind of timeout. Thus, you need to store them
632 /// somewhere and spend them when you create on-chain transactions.
634 /// The outputs which you should store as spendable by you.
635 outputs: Vec<SpendableOutputDescriptor>,
637 /// This event is generated when a payment has been successfully forwarded through us and a
638 /// forwarding fee earned.
640 /// The incoming channel between the previous node and us. This is only `None` for events
641 /// generated or serialized by versions prior to 0.0.107.
642 prev_channel_id: Option<[u8; 32]>,
643 /// The outgoing channel between the next node and us. This is only `None` for events
644 /// generated or serialized by versions prior to 0.0.107.
645 next_channel_id: Option<[u8; 32]>,
646 /// The fee, in milli-satoshis, which was earned as a result of the payment.
648 /// Note that if we force-closed the channel over which we forwarded an HTLC while the HTLC
649 /// was pending, the amount the next hop claimed will have been rounded down to the nearest
650 /// whole satoshi. Thus, the fee calculated here may be higher than expected as we still
651 /// claimed the full value in millisatoshis from the source. In this case,
652 /// `claim_from_onchain_tx` will be set.
654 /// If the channel which sent us the payment has been force-closed, we will claim the funds
655 /// via an on-chain transaction. In that case we do not yet know the on-chain transaction
656 /// fees which we will spend and will instead set this to `None`. It is possible duplicate
657 /// `PaymentForwarded` events are generated for the same payment iff `fee_earned_msat` is
659 fee_earned_msat: Option<u64>,
660 /// If this is `true`, the forwarded HTLC was claimed by our counterparty via an on-chain
662 claim_from_onchain_tx: bool,
663 /// The final amount forwarded, in milli-satoshis, after the fee is deducted.
665 /// The caveat described above the `fee_earned_msat` field applies here as well.
666 outbound_amount_forwarded_msat: Option<u64>,
668 /// Used to indicate that a channel with the given `channel_id` is being opened and pending
669 /// confirmation on-chain.
671 /// This event is emitted when the funding transaction has been signed and is broadcast to the
672 /// network. For 0conf channels it will be immediately followed by the corresponding
673 /// [`Event::ChannelReady`] event.
675 /// The `channel_id` of the channel that is pending confirmation.
676 channel_id: [u8; 32],
677 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
678 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
679 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
680 /// `user_channel_id` will be randomized for an inbound channel.
682 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
683 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
684 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
685 user_channel_id: u128,
686 /// The `temporary_channel_id` this channel used to be known by during channel establishment.
688 /// Will be `None` for channels created prior to LDK version 0.0.115.
689 former_temporary_channel_id: Option<[u8; 32]>,
690 /// The `node_id` of the channel counterparty.
691 counterparty_node_id: PublicKey,
692 /// The outpoint of the channel's funding transaction.
693 funding_txo: OutPoint,
695 /// Used to indicate that a channel with the given `channel_id` is ready to
696 /// be used. This event is emitted either when the funding transaction has been confirmed
697 /// on-chain, or, in case of a 0conf channel, when both parties have confirmed the channel
700 /// The `channel_id` of the channel that is ready.
701 channel_id: [u8; 32],
702 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
703 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
704 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
705 /// `user_channel_id` will be randomized for an inbound channel.
707 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
708 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
709 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
710 user_channel_id: u128,
711 /// The `node_id` of the channel counterparty.
712 counterparty_node_id: PublicKey,
713 /// The features that this channel will operate with.
714 channel_type: ChannelTypeFeatures,
716 /// Used to indicate that a previously opened channel with the given `channel_id` is in the
717 /// process of closure.
719 /// The `channel_id` of the channel which has been closed. Note that on-chain transactions
720 /// resolving the channel are likely still awaiting confirmation.
721 channel_id: [u8; 32],
722 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
723 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
724 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
725 /// `user_channel_id` will be randomized for inbound channels.
726 /// This may be zero for inbound channels serialized prior to 0.0.113 and will always be
727 /// zero for objects serialized with LDK versions prior to 0.0.102.
729 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
730 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
731 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
732 user_channel_id: u128,
733 /// The reason the channel was closed.
734 reason: ClosureReason
736 /// Used to indicate to the user that they can abandon the funding transaction and recycle the
737 /// inputs for another purpose.
739 /// The channel_id of the channel which has been closed.
740 channel_id: [u8; 32],
741 /// The full transaction received from the user
742 transaction: Transaction
744 /// Indicates a request to open a new channel by a peer.
746 /// To accept the request, call [`ChannelManager::accept_inbound_channel`]. To reject the
747 /// request, call [`ChannelManager::force_close_without_broadcasting_txn`].
749 /// The event is only triggered when a new open channel request is received and the
750 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true.
752 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
753 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
754 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
756 /// The temporary channel ID of the channel requested to be opened.
758 /// When responding to the request, the `temporary_channel_id` should be passed
759 /// back to the ChannelManager through [`ChannelManager::accept_inbound_channel`] to accept,
760 /// or through [`ChannelManager::force_close_without_broadcasting_txn`] to reject.
762 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
763 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
764 temporary_channel_id: [u8; 32],
765 /// The node_id of the counterparty requesting to open the channel.
767 /// When responding to the request, the `counterparty_node_id` should be passed
768 /// back to the `ChannelManager` through [`ChannelManager::accept_inbound_channel`] to
769 /// accept the request, or through [`ChannelManager::force_close_without_broadcasting_txn`] to reject the
772 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
773 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
774 counterparty_node_id: PublicKey,
775 /// The channel value of the requested channel.
776 funding_satoshis: u64,
777 /// Our starting balance in the channel if the request is accepted, in milli-satoshi.
779 /// The features that this channel will operate with. If you reject the channel, a
780 /// well-behaved counterparty may automatically re-attempt the channel with a new set of
783 /// Note that if [`ChannelTypeFeatures::supports_scid_privacy`] returns true on this type,
784 /// the resulting [`ChannelManager`] will not be readable by versions of LDK prior to
787 /// Furthermore, note that if [`ChannelTypeFeatures::supports_zero_conf`] returns true on this type,
788 /// the resulting [`ChannelManager`] will not be readable by versions of LDK prior to
789 /// 0.0.107. Channels setting this type also need to get manually accepted via
790 /// [`crate::ln::channelmanager::ChannelManager::accept_inbound_channel_from_trusted_peer_0conf`],
791 /// or will be rejected otherwise.
793 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
794 channel_type: ChannelTypeFeatures,
796 /// Indicates that the HTLC was accepted, but could not be processed when or after attempting to
799 /// Some scenarios where this event may be sent include:
800 /// * Insufficient capacity in the outbound channel
801 /// * While waiting to forward the HTLC, the channel it is meant to be forwarded through closes
802 /// * When an unknown SCID is requested for forwarding a payment.
803 /// * Expected MPP amount has already been reached
804 /// * The HTLC has timed out
806 /// This event, however, does not get generated if an HTLC fails to meet the forwarding
807 /// requirements (i.e. insufficient fees paid, or a CLTV that is too soon).
809 /// The channel over which the HTLC was received.
810 prev_channel_id: [u8; 32],
811 /// Destination of the HTLC that failed to be processed.
812 failed_next_destination: HTLCDestination,
815 /// Indicates that a transaction originating from LDK needs to have its fee bumped. This event
816 /// requires confirmed external funds to be readily available to spend.
818 /// LDK does not currently generate this event. It is limited to the scope of channels with
819 /// anchor outputs, which will be introduced in a future release.
820 BumpTransaction(BumpTransactionEvent),
823 impl Writeable for Event {
824 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
826 &Event::FundingGenerationReady { .. } => {
828 // We never write out FundingGenerationReady events as, upon disconnection, peers
829 // drop any channels which have not yet exchanged funding_signed.
831 &Event::PaymentClaimable { ref payment_hash, ref amount_msat, ref purpose,
832 ref receiver_node_id, ref via_channel_id, ref via_user_channel_id,
833 ref claim_deadline, ref onion_fields
836 let mut payment_secret = None;
837 let payment_preimage;
839 PaymentPurpose::InvoicePayment { payment_preimage: preimage, payment_secret: secret } => {
840 payment_secret = Some(secret);
841 payment_preimage = *preimage;
843 PaymentPurpose::SpontaneousPayment(preimage) => {
844 payment_preimage = Some(*preimage);
847 write_tlv_fields!(writer, {
848 (0, payment_hash, required),
849 (1, receiver_node_id, option),
850 (2, payment_secret, option),
851 (3, via_channel_id, option),
852 (4, amount_msat, required),
853 (5, via_user_channel_id, option),
854 (6, 0u64, required), // user_payment_id required for compatibility with 0.0.103 and earlier
855 (7, claim_deadline, option),
856 (8, payment_preimage, option),
857 (9, onion_fields, option),
860 &Event::PaymentSent { ref payment_id, ref payment_preimage, ref payment_hash, ref fee_paid_msat } => {
862 write_tlv_fields!(writer, {
863 (0, payment_preimage, required),
864 (1, payment_hash, required),
865 (3, payment_id, option),
866 (5, fee_paid_msat, option),
869 &Event::PaymentPathFailed {
870 ref payment_id, ref payment_hash, ref payment_failed_permanently, ref failure,
871 ref path, ref short_channel_id,
879 error_code.write(writer)?;
881 error_data.write(writer)?;
882 write_tlv_fields!(writer, {
883 (0, payment_hash, required),
884 (1, None::<NetworkUpdate>, option), // network_update in LDK versions prior to 0.0.114
885 (2, payment_failed_permanently, required),
886 (3, false, required), // all_paths_failed in LDK versions prior to 0.0.114
887 (5, *path, vec_type),
888 (7, short_channel_id, option),
889 (9, None::<RouteParameters>, option), // retry in LDK versions prior to 0.0.115
890 (11, payment_id, option),
891 (13, failure, required),
894 &Event::PendingHTLCsForwardable { time_forwardable: _ } => {
896 // Note that we now ignore these on the read end as we'll re-generate them in
897 // ChannelManager, we write them here only for backwards compatibility.
899 &Event::SpendableOutputs { ref outputs } => {
901 write_tlv_fields!(writer, {
902 (0, WithoutLength(outputs), required),
905 &Event::HTLCIntercepted { requested_next_hop_scid, payment_hash, inbound_amount_msat, expected_outbound_amount_msat, intercept_id } => {
907 let intercept_scid = InterceptNextHop::FakeScid { requested_next_hop_scid };
908 write_tlv_fields!(writer, {
909 (0, intercept_id, required),
910 (2, intercept_scid, required),
911 (4, payment_hash, required),
912 (6, inbound_amount_msat, required),
913 (8, expected_outbound_amount_msat, required),
916 &Event::PaymentForwarded {
917 fee_earned_msat, prev_channel_id, claim_from_onchain_tx,
918 next_channel_id, outbound_amount_forwarded_msat
921 write_tlv_fields!(writer, {
922 (0, fee_earned_msat, option),
923 (1, prev_channel_id, option),
924 (2, claim_from_onchain_tx, required),
925 (3, next_channel_id, option),
926 (5, outbound_amount_forwarded_msat, option),
929 &Event::ChannelClosed { ref channel_id, ref user_channel_id, ref reason } => {
931 // `user_channel_id` used to be a single u64 value. In order to remain backwards
932 // compatible with versions prior to 0.0.113, the u128 is serialized as two
933 // separate u64 values.
934 let user_channel_id_low = *user_channel_id as u64;
935 let user_channel_id_high = (*user_channel_id >> 64) as u64;
936 write_tlv_fields!(writer, {
937 (0, channel_id, required),
938 (1, user_channel_id_low, required),
939 (2, reason, required),
940 (3, user_channel_id_high, required),
943 &Event::DiscardFunding { ref channel_id, ref transaction } => {
945 write_tlv_fields!(writer, {
946 (0, channel_id, required),
947 (2, transaction, required)
950 &Event::PaymentPathSuccessful { ref payment_id, ref payment_hash, ref path } => {
952 write_tlv_fields!(writer, {
953 (0, payment_id, required),
954 (2, payment_hash, option),
958 &Event::PaymentFailed { ref payment_id, ref payment_hash, ref reason } => {
960 write_tlv_fields!(writer, {
961 (0, payment_id, required),
963 (2, payment_hash, required),
966 &Event::OpenChannelRequest { .. } => {
968 // We never write the OpenChannelRequest events as, upon disconnection, peers
969 // drop any channels which have not yet exchanged funding_signed.
971 &Event::PaymentClaimed { ref payment_hash, ref amount_msat, ref purpose, ref receiver_node_id } => {
973 write_tlv_fields!(writer, {
974 (0, payment_hash, required),
975 (1, receiver_node_id, option),
976 (2, purpose, required),
977 (4, amount_msat, required),
980 &Event::ProbeSuccessful { ref payment_id, ref payment_hash, ref path } => {
982 write_tlv_fields!(writer, {
983 (0, payment_id, required),
984 (2, payment_hash, required),
988 &Event::ProbeFailed { ref payment_id, ref payment_hash, ref path, ref short_channel_id } => {
990 write_tlv_fields!(writer, {
991 (0, payment_id, required),
992 (2, payment_hash, required),
993 (4, *path, vec_type),
994 (6, short_channel_id, option),
997 &Event::HTLCHandlingFailed { ref prev_channel_id, ref failed_next_destination } => {
999 write_tlv_fields!(writer, {
1000 (0, prev_channel_id, required),
1001 (2, failed_next_destination, required),
1005 &Event::BumpTransaction(ref event)=> {
1006 27u8.write(writer)?;
1008 // We never write the ChannelClose|HTLCResolution events as they'll be replayed
1009 // upon restarting anyway if they remain unresolved.
1010 BumpTransactionEvent::ChannelClose { .. } => {}
1011 BumpTransactionEvent::HTLCResolution { .. } => {}
1013 write_tlv_fields!(writer, {}); // Write a length field for forwards compat
1015 &Event::ChannelReady { ref channel_id, ref user_channel_id, ref counterparty_node_id, ref channel_type } => {
1016 29u8.write(writer)?;
1017 write_tlv_fields!(writer, {
1018 (0, channel_id, required),
1019 (2, user_channel_id, required),
1020 (4, counterparty_node_id, required),
1021 (6, channel_type, required),
1024 &Event::ChannelPending { ref channel_id, ref user_channel_id, ref former_temporary_channel_id, ref counterparty_node_id, ref funding_txo } => {
1025 31u8.write(writer)?;
1026 write_tlv_fields!(writer, {
1027 (0, channel_id, required),
1028 (2, user_channel_id, required),
1029 (4, former_temporary_channel_id, required),
1030 (6, counterparty_node_id, required),
1031 (8, funding_txo, required),
1034 // Note that, going forward, all new events must only write data inside of
1035 // `write_tlv_fields`. Versions 0.0.101+ will ignore odd-numbered events that write
1036 // data via `write_tlv_fields`.
1041 impl MaybeReadable for Event {
1042 fn read<R: io::Read>(reader: &mut R) -> Result<Option<Self>, msgs::DecodeError> {
1043 match Readable::read(reader)? {
1044 // Note that we do not write a length-prefixed TLV for FundingGenerationReady events,
1045 // unlike all other events, thus we return immediately here.
1049 let mut payment_hash = PaymentHash([0; 32]);
1050 let mut payment_preimage = None;
1051 let mut payment_secret = None;
1052 let mut amount_msat = 0;
1053 let mut receiver_node_id = None;
1054 let mut _user_payment_id = None::<u64>; // For compatibility with 0.0.103 and earlier
1055 let mut via_channel_id = None;
1056 let mut claim_deadline = None;
1057 let mut via_user_channel_id = None;
1058 let mut onion_fields = None;
1059 read_tlv_fields!(reader, {
1060 (0, payment_hash, required),
1061 (1, receiver_node_id, option),
1062 (2, payment_secret, option),
1063 (3, via_channel_id, option),
1064 (4, amount_msat, required),
1065 (5, via_user_channel_id, option),
1066 (6, _user_payment_id, option),
1067 (7, claim_deadline, option),
1068 (8, payment_preimage, option),
1069 (9, onion_fields, option),
1071 let purpose = match payment_secret {
1072 Some(secret) => PaymentPurpose::InvoicePayment {
1074 payment_secret: secret
1076 None if payment_preimage.is_some() => PaymentPurpose::SpontaneousPayment(payment_preimage.unwrap()),
1077 None => return Err(msgs::DecodeError::InvalidValue),
1079 Ok(Some(Event::PaymentClaimable {
1085 via_user_channel_id,
1094 let mut payment_preimage = PaymentPreimage([0; 32]);
1095 let mut payment_hash = None;
1096 let mut payment_id = None;
1097 let mut fee_paid_msat = None;
1098 read_tlv_fields!(reader, {
1099 (0, payment_preimage, required),
1100 (1, payment_hash, option),
1101 (3, payment_id, option),
1102 (5, fee_paid_msat, option),
1104 if payment_hash.is_none() {
1105 payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0[..]).into_inner()));
1107 Ok(Some(Event::PaymentSent {
1110 payment_hash: payment_hash.unwrap(),
1119 let error_code = Readable::read(reader)?;
1121 let error_data = Readable::read(reader)?;
1122 let mut payment_hash = PaymentHash([0; 32]);
1123 let mut payment_failed_permanently = false;
1124 let mut network_update = None;
1125 let mut path: Option<Vec<RouteHop>> = Some(vec![]);
1126 let mut short_channel_id = None;
1127 let mut payment_id = None;
1128 let mut failure_opt = None;
1129 read_tlv_fields!(reader, {
1130 (0, payment_hash, required),
1131 (1, network_update, upgradable_option),
1132 (2, payment_failed_permanently, required),
1133 (5, path, vec_type),
1134 (7, short_channel_id, option),
1135 (11, payment_id, option),
1136 (13, failure_opt, upgradable_option),
1138 let failure = failure_opt.unwrap_or_else(|| PathFailure::OnPath { network_update });
1139 Ok(Some(Event::PaymentPathFailed {
1142 payment_failed_permanently,
1144 path: path.unwrap(),
1157 let mut outputs = WithoutLength(Vec::new());
1158 read_tlv_fields!(reader, {
1159 (0, outputs, required),
1161 Ok(Some(Event::SpendableOutputs { outputs: outputs.0 }))
1166 let mut payment_hash = PaymentHash([0; 32]);
1167 let mut intercept_id = InterceptId([0; 32]);
1168 let mut requested_next_hop_scid = InterceptNextHop::FakeScid { requested_next_hop_scid: 0 };
1169 let mut inbound_amount_msat = 0;
1170 let mut expected_outbound_amount_msat = 0;
1171 read_tlv_fields!(reader, {
1172 (0, intercept_id, required),
1173 (2, requested_next_hop_scid, required),
1174 (4, payment_hash, required),
1175 (6, inbound_amount_msat, required),
1176 (8, expected_outbound_amount_msat, required),
1178 let next_scid = match requested_next_hop_scid {
1179 InterceptNextHop::FakeScid { requested_next_hop_scid: scid } => scid
1181 Ok(Some(Event::HTLCIntercepted {
1183 requested_next_hop_scid: next_scid,
1184 inbound_amount_msat,
1185 expected_outbound_amount_msat,
1191 let mut fee_earned_msat = None;
1192 let mut prev_channel_id = None;
1193 let mut claim_from_onchain_tx = false;
1194 let mut next_channel_id = None;
1195 let mut outbound_amount_forwarded_msat = None;
1196 read_tlv_fields!(reader, {
1197 (0, fee_earned_msat, option),
1198 (1, prev_channel_id, option),
1199 (2, claim_from_onchain_tx, required),
1200 (3, next_channel_id, option),
1201 (5, outbound_amount_forwarded_msat, option),
1203 Ok(Some(Event::PaymentForwarded {
1204 fee_earned_msat, prev_channel_id, claim_from_onchain_tx, next_channel_id,
1205 outbound_amount_forwarded_msat
1212 let mut channel_id = [0; 32];
1213 let mut reason = UpgradableRequired(None);
1214 let mut user_channel_id_low_opt: Option<u64> = None;
1215 let mut user_channel_id_high_opt: Option<u64> = None;
1216 read_tlv_fields!(reader, {
1217 (0, channel_id, required),
1218 (1, user_channel_id_low_opt, option),
1219 (2, reason, upgradable_required),
1220 (3, user_channel_id_high_opt, option),
1223 // `user_channel_id` used to be a single u64 value. In order to remain
1224 // backwards compatible with versions prior to 0.0.113, the u128 is serialized
1225 // as two separate u64 values.
1226 let user_channel_id = (user_channel_id_low_opt.unwrap_or(0) as u128) +
1227 ((user_channel_id_high_opt.unwrap_or(0) as u128) << 64);
1229 Ok(Some(Event::ChannelClosed { channel_id, user_channel_id, reason: _init_tlv_based_struct_field!(reason, upgradable_required) }))
1235 let mut channel_id = [0; 32];
1236 let mut transaction = Transaction{ version: 2, lock_time: PackedLockTime::ZERO, input: Vec::new(), output: Vec::new() };
1237 read_tlv_fields!(reader, {
1238 (0, channel_id, required),
1239 (2, transaction, required),
1241 Ok(Some(Event::DiscardFunding { channel_id, transaction } ))
1247 let mut payment_id = PaymentId([0; 32]);
1248 let mut payment_hash = None;
1249 let mut path: Option<Vec<RouteHop>> = Some(vec![]);
1250 read_tlv_fields!(reader, {
1251 (0, payment_id, required),
1252 (2, payment_hash, option),
1253 (4, path, vec_type),
1255 Ok(Some(Event::PaymentPathSuccessful {
1258 path: path.unwrap(),
1265 let mut payment_hash = PaymentHash([0; 32]);
1266 let mut payment_id = PaymentId([0; 32]);
1267 let mut reason = None;
1268 read_tlv_fields!(reader, {
1269 (0, payment_id, required),
1270 (1, reason, upgradable_option),
1271 (2, payment_hash, required),
1273 Ok(Some(Event::PaymentFailed {
1282 // Value 17 is used for `Event::OpenChannelRequest`.
1287 let mut payment_hash = PaymentHash([0; 32]);
1288 let mut purpose = UpgradableRequired(None);
1289 let mut amount_msat = 0;
1290 let mut receiver_node_id = None;
1291 read_tlv_fields!(reader, {
1292 (0, payment_hash, required),
1293 (1, receiver_node_id, option),
1294 (2, purpose, upgradable_required),
1295 (4, amount_msat, required),
1297 Ok(Some(Event::PaymentClaimed {
1300 purpose: _init_tlv_based_struct_field!(purpose, upgradable_required),
1308 let mut payment_id = PaymentId([0; 32]);
1309 let mut payment_hash = PaymentHash([0; 32]);
1310 let mut path: Option<Vec<RouteHop>> = Some(vec![]);
1311 read_tlv_fields!(reader, {
1312 (0, payment_id, required),
1313 (2, payment_hash, required),
1314 (4, path, vec_type),
1316 Ok(Some(Event::ProbeSuccessful {
1319 path: path.unwrap(),
1326 let mut payment_id = PaymentId([0; 32]);
1327 let mut payment_hash = PaymentHash([0; 32]);
1328 let mut path: Option<Vec<RouteHop>> = Some(vec![]);
1329 let mut short_channel_id = None;
1330 read_tlv_fields!(reader, {
1331 (0, payment_id, required),
1332 (2, payment_hash, required),
1333 (4, path, vec_type),
1334 (6, short_channel_id, option),
1336 Ok(Some(Event::ProbeFailed {
1339 path: path.unwrap(),
1347 let mut prev_channel_id = [0; 32];
1348 let mut failed_next_destination_opt = UpgradableRequired(None);
1349 read_tlv_fields!(reader, {
1350 (0, prev_channel_id, required),
1351 (2, failed_next_destination_opt, upgradable_required),
1353 Ok(Some(Event::HTLCHandlingFailed {
1355 failed_next_destination: _init_tlv_based_struct_field!(failed_next_destination_opt, upgradable_required),
1363 let mut channel_id = [0; 32];
1364 let mut user_channel_id: u128 = 0;
1365 let mut counterparty_node_id = RequiredWrapper(None);
1366 let mut channel_type = RequiredWrapper(None);
1367 read_tlv_fields!(reader, {
1368 (0, channel_id, required),
1369 (2, user_channel_id, required),
1370 (4, counterparty_node_id, required),
1371 (6, channel_type, required),
1374 Ok(Some(Event::ChannelReady {
1377 counterparty_node_id: counterparty_node_id.0.unwrap(),
1378 channel_type: channel_type.0.unwrap()
1385 let mut channel_id = [0; 32];
1386 let mut user_channel_id: u128 = 0;
1387 let mut former_temporary_channel_id = None;
1388 let mut counterparty_node_id = RequiredWrapper(None);
1389 let mut funding_txo = RequiredWrapper(None);
1390 read_tlv_fields!(reader, {
1391 (0, channel_id, required),
1392 (2, user_channel_id, required),
1393 (4, former_temporary_channel_id, required),
1394 (6, counterparty_node_id, required),
1395 (8, funding_txo, required),
1398 Ok(Some(Event::ChannelPending {
1401 former_temporary_channel_id,
1402 counterparty_node_id: counterparty_node_id.0.unwrap(),
1403 funding_txo: funding_txo.0.unwrap()
1408 // Versions prior to 0.0.100 did not ignore odd types, instead returning InvalidValue.
1409 // Version 0.0.100 failed to properly ignore odd types, possibly resulting in corrupt
1411 x if x % 2 == 1 => {
1412 // If the event is of unknown type, assume it was written with `write_tlv_fields`,
1413 // which prefixes the whole thing with a length BigSize. Because the event is
1414 // odd-type unknown, we should treat it as `Ok(None)` even if it has some TLV
1415 // fields that are even. Thus, we avoid using `read_tlv_fields` and simply read
1416 // exactly the number of bytes specified, ignoring them entirely.
1417 let tlv_len: BigSize = Readable::read(reader)?;
1418 FixedLengthReader::new(reader, tlv_len.0)
1419 .eat_remaining().map_err(|_| msgs::DecodeError::ShortRead)?;
1422 _ => Err(msgs::DecodeError::InvalidValue)
1427 /// An event generated by ChannelManager which indicates a message should be sent to a peer (or
1428 /// broadcast to most peers).
1429 /// These events are handled by PeerManager::process_events if you are using a PeerManager.
1430 #[derive(Clone, Debug)]
1431 pub enum MessageSendEvent {
1432 /// Used to indicate that we've accepted a channel open and should send the accept_channel
1433 /// message provided to the given peer.
1435 /// The node_id of the node which should receive this message
1437 /// The message which should be sent.
1438 msg: msgs::AcceptChannel,
1440 /// Used to indicate that we've initiated a channel open and should send the open_channel
1441 /// message provided to the given peer.
1443 /// The node_id of the node which should receive this message
1445 /// The message which should be sent.
1446 msg: msgs::OpenChannel,
1448 /// Used to indicate that a funding_created message should be sent to the peer with the given node_id.
1449 SendFundingCreated {
1450 /// The node_id of the node which should receive this message
1452 /// The message which should be sent.
1453 msg: msgs::FundingCreated,
1455 /// Used to indicate that a funding_signed message should be sent to the peer with the given node_id.
1457 /// The node_id of the node which should receive this message
1459 /// The message which should be sent.
1460 msg: msgs::FundingSigned,
1462 /// Used to indicate that a channel_ready message should be sent to the peer with the given node_id.
1464 /// The node_id of the node which should receive these message(s)
1466 /// The channel_ready message which should be sent.
1467 msg: msgs::ChannelReady,
1469 /// Used to indicate that an announcement_signatures message should be sent to the peer with the given node_id.
1470 SendAnnouncementSignatures {
1471 /// The node_id of the node which should receive these message(s)
1473 /// The announcement_signatures message which should be sent.
1474 msg: msgs::AnnouncementSignatures,
1476 /// Used to indicate that a series of HTLC update messages, as well as a commitment_signed
1477 /// message should be sent to the peer with the given node_id.
1479 /// The node_id of the node which should receive these message(s)
1481 /// The update messages which should be sent. ALL messages in the struct should be sent!
1482 updates: msgs::CommitmentUpdate,
1484 /// Used to indicate that a revoke_and_ack message should be sent to the peer with the given node_id.
1486 /// The node_id of the node which should receive this message
1488 /// The message which should be sent.
1489 msg: msgs::RevokeAndACK,
1491 /// Used to indicate that a closing_signed message should be sent to the peer with the given node_id.
1493 /// The node_id of the node which should receive this message
1495 /// The message which should be sent.
1496 msg: msgs::ClosingSigned,
1498 /// Used to indicate that a shutdown message should be sent to the peer with the given node_id.
1500 /// The node_id of the node which should receive this message
1502 /// The message which should be sent.
1503 msg: msgs::Shutdown,
1505 /// Used to indicate that a channel_reestablish message should be sent to the peer with the given node_id.
1506 SendChannelReestablish {
1507 /// The node_id of the node which should receive this message
1509 /// The message which should be sent.
1510 msg: msgs::ChannelReestablish,
1512 /// Used to send a channel_announcement and channel_update to a specific peer, likely on
1513 /// initial connection to ensure our peers know about our channels.
1514 SendChannelAnnouncement {
1515 /// The node_id of the node which should receive this message
1517 /// The channel_announcement which should be sent.
1518 msg: msgs::ChannelAnnouncement,
1519 /// The followup channel_update which should be sent.
1520 update_msg: msgs::ChannelUpdate,
1522 /// Used to indicate that a channel_announcement and channel_update should be broadcast to all
1523 /// peers (except the peer with node_id either msg.contents.node_id_1 or msg.contents.node_id_2).
1525 /// Note that after doing so, you very likely (unless you did so very recently) want to
1526 /// broadcast a node_announcement (e.g. via [`PeerManager::broadcast_node_announcement`]). This
1527 /// ensures that any nodes which see our channel_announcement also have a relevant
1528 /// node_announcement, including relevant feature flags which may be important for routing
1529 /// through or to us.
1531 /// [`PeerManager::broadcast_node_announcement`]: crate::ln::peer_handler::PeerManager::broadcast_node_announcement
1532 BroadcastChannelAnnouncement {
1533 /// The channel_announcement which should be sent.
1534 msg: msgs::ChannelAnnouncement,
1535 /// The followup channel_update which should be sent.
1536 update_msg: Option<msgs::ChannelUpdate>,
1538 /// Used to indicate that a channel_update should be broadcast to all peers.
1539 BroadcastChannelUpdate {
1540 /// The channel_update which should be sent.
1541 msg: msgs::ChannelUpdate,
1543 /// Used to indicate that a node_announcement should be broadcast to all peers.
1544 BroadcastNodeAnnouncement {
1545 /// The node_announcement which should be sent.
1546 msg: msgs::NodeAnnouncement,
1548 /// Used to indicate that a channel_update should be sent to a single peer.
1549 /// In contrast to [`Self::BroadcastChannelUpdate`], this is used when the channel is a
1550 /// private channel and we shouldn't be informing all of our peers of channel parameters.
1552 /// The node_id of the node which should receive this message
1554 /// The channel_update which should be sent.
1555 msg: msgs::ChannelUpdate,
1557 /// Broadcast an error downstream to be handled
1559 /// The node_id of the node which should receive this message
1561 /// The action which should be taken.
1562 action: msgs::ErrorAction
1564 /// Query a peer for channels with funding transaction UTXOs in a block range.
1565 SendChannelRangeQuery {
1566 /// The node_id of this message recipient
1568 /// The query_channel_range which should be sent.
1569 msg: msgs::QueryChannelRange,
1571 /// Request routing gossip messages from a peer for a list of channels identified by
1572 /// their short_channel_ids.
1574 /// The node_id of this message recipient
1576 /// The query_short_channel_ids which should be sent.
1577 msg: msgs::QueryShortChannelIds,
1579 /// Sends a reply to a channel range query. This may be one of several SendReplyChannelRange events
1580 /// emitted during processing of the query.
1581 SendReplyChannelRange {
1582 /// The node_id of this message recipient
1584 /// The reply_channel_range which should be sent.
1585 msg: msgs::ReplyChannelRange,
1587 /// Sends a timestamp filter for inbound gossip. This should be sent on each new connection to
1588 /// enable receiving gossip messages from the peer.
1589 SendGossipTimestampFilter {
1590 /// The node_id of this message recipient
1592 /// The gossip_timestamp_filter which should be sent.
1593 msg: msgs::GossipTimestampFilter,
1597 /// A trait indicating an object may generate message send events
1598 pub trait MessageSendEventsProvider {
1599 /// Gets the list of pending events which were generated by previous actions, clearing the list
1601 fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent>;
1604 /// A trait indicating an object may generate onion messages to send
1605 pub trait OnionMessageProvider {
1606 /// Gets the next pending onion message for the peer with the given node id.
1607 fn next_onion_message_for_peer(&self, peer_node_id: PublicKey) -> Option<msgs::OnionMessage>;
1610 /// A trait indicating an object may generate events.
1612 /// Events are processed by passing an [`EventHandler`] to [`process_pending_events`].
1614 /// Implementations of this trait may also feature an async version of event handling, as shown with
1615 /// [`ChannelManager::process_pending_events_async`] and
1616 /// [`ChainMonitor::process_pending_events_async`].
1620 /// When using this trait, [`process_pending_events`] will call [`handle_event`] for each pending
1621 /// event since the last invocation.
1623 /// In order to ensure no [`Event`]s are lost, implementors of this trait will persist [`Event`]s
1624 /// and replay any unhandled events on startup. An [`Event`] is considered handled when
1625 /// [`process_pending_events`] returns, thus handlers MUST fully handle [`Event`]s and persist any
1626 /// relevant changes to disk *before* returning.
1628 /// Further, because an application may crash between an [`Event`] being handled and the
1629 /// implementor of this trait being re-serialized, [`Event`] handling must be idempotent - in
1630 /// effect, [`Event`]s may be replayed.
1632 /// Note, handlers may call back into the provider and thus deadlocking must be avoided. Be sure to
1633 /// consult the provider's documentation on the implication of processing events and how a handler
1634 /// may safely use the provider (e.g., see [`ChannelManager::process_pending_events`] and
1635 /// [`ChainMonitor::process_pending_events`]).
1637 /// (C-not implementable) As there is likely no reason for a user to implement this trait on their
1640 /// [`process_pending_events`]: Self::process_pending_events
1641 /// [`handle_event`]: EventHandler::handle_event
1642 /// [`ChannelManager::process_pending_events`]: crate::ln::channelmanager::ChannelManager#method.process_pending_events
1643 /// [`ChainMonitor::process_pending_events`]: crate::chain::chainmonitor::ChainMonitor#method.process_pending_events
1644 /// [`ChannelManager::process_pending_events_async`]: crate::ln::channelmanager::ChannelManager::process_pending_events_async
1645 /// [`ChainMonitor::process_pending_events_async`]: crate::chain::chainmonitor::ChainMonitor::process_pending_events_async
1646 pub trait EventsProvider {
1647 /// Processes any events generated since the last call using the given event handler.
1649 /// See the trait-level documentation for requirements.
1650 fn process_pending_events<H: Deref>(&self, handler: H) where H::Target: EventHandler;
1653 /// A trait implemented for objects handling events from [`EventsProvider`].
1655 /// An async variation also exists for implementations of [`EventsProvider`] that support async
1656 /// event handling. The async event handler should satisfy the generic bounds: `F:
1657 /// core::future::Future, H: Fn(Event) -> F`.
1658 pub trait EventHandler {
1659 /// Handles the given [`Event`].
1661 /// See [`EventsProvider`] for details that must be considered when implementing this method.
1662 fn handle_event(&self, event: Event);
1665 impl<F> EventHandler for F where F: Fn(Event) {
1666 fn handle_event(&self, event: Event) {
1671 impl<T: EventHandler> EventHandler for Arc<T> {
1672 fn handle_event(&self, event: Event) {
1673 self.deref().handle_event(event)