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
17 pub mod bump_transaction;
19 pub use bump_transaction::BumpTransactionEvent;
21 use crate::sign::SpendableOutputDescriptor;
22 use crate::ln::channelmanager::{InterceptId, PaymentId, RecipientOnionFields};
23 use crate::ln::channel::FUNDING_CONF_DEADLINE_BLOCKS;
24 use crate::ln::features::ChannelTypeFeatures;
26 use crate::ln::{ChannelId, PaymentPreimage, PaymentHash, PaymentSecret};
27 use crate::routing::gossip::NetworkUpdate;
28 use crate::util::errors::APIError;
29 use crate::util::ser::{BigSize, FixedLengthReader, Writeable, Writer, MaybeReadable, Readable, RequiredWrapper, UpgradableRequired, WithoutLength};
30 use crate::util::string::UntrustedString;
31 use crate::routing::router::{BlindedTail, Path, RouteHop, RouteParameters};
33 use bitcoin::{Transaction, OutPoint};
34 use bitcoin::blockdata::locktime::absolute::LockTime;
35 use bitcoin::blockdata::script::ScriptBuf;
36 use bitcoin::hashes::Hash;
37 use bitcoin::hashes::sha256::Hash as Sha256;
38 use bitcoin::secp256k1::PublicKey;
40 use crate::prelude::*;
41 use core::time::Duration;
45 /// Some information provided on receipt of payment depends on whether the payment received is a
46 /// spontaneous payment or a "conventional" lightning payment that's paying an invoice.
47 #[derive(Clone, Debug, PartialEq, Eq)]
48 pub enum PaymentPurpose {
49 /// Information for receiving a payment that we generated an invoice for.
51 /// The preimage to the payment_hash, if the payment hash (and secret) were fetched via
52 /// [`ChannelManager::create_inbound_payment`]. If provided, this can be handed directly to
53 /// [`ChannelManager::claim_funds`].
55 /// [`ChannelManager::create_inbound_payment`]: crate::ln::channelmanager::ChannelManager::create_inbound_payment
56 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
57 payment_preimage: Option<PaymentPreimage>,
58 /// The "payment secret". This authenticates the sender to the recipient, preventing a
59 /// number of deanonymization attacks during the routing process.
60 /// It is provided here for your reference, however its accuracy is enforced directly by
61 /// [`ChannelManager`] using the values you previously provided to
62 /// [`ChannelManager::create_inbound_payment`] or
63 /// [`ChannelManager::create_inbound_payment_for_hash`].
65 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
66 /// [`ChannelManager::create_inbound_payment`]: crate::ln::channelmanager::ChannelManager::create_inbound_payment
67 /// [`ChannelManager::create_inbound_payment_for_hash`]: crate::ln::channelmanager::ChannelManager::create_inbound_payment_for_hash
68 payment_secret: PaymentSecret,
70 /// Because this is a spontaneous payment, the payer generated their own preimage rather than us
71 /// (the payee) providing a preimage.
72 SpontaneousPayment(PaymentPreimage),
76 /// Returns the preimage for this payment, if it is known.
77 pub fn preimage(&self) -> Option<PaymentPreimage> {
79 PaymentPurpose::InvoicePayment { payment_preimage, .. } => *payment_preimage,
80 PaymentPurpose::SpontaneousPayment(preimage) => Some(*preimage),
85 impl_writeable_tlv_based_enum!(PaymentPurpose,
86 (0, InvoicePayment) => {
87 (0, payment_preimage, option),
88 (2, payment_secret, required),
90 (2, SpontaneousPayment)
93 /// Information about an HTLC that is part of a payment that can be claimed.
94 #[derive(Clone, Debug, PartialEq, Eq)]
95 pub struct ClaimedHTLC {
96 /// The `channel_id` of the channel over which the HTLC was received.
97 pub channel_id: ChannelId,
98 /// The `user_channel_id` of the channel over which the HTLC was received. This is the value
99 /// passed in to [`ChannelManager::create_channel`] for outbound channels, or to
100 /// [`ChannelManager::accept_inbound_channel`] for inbound channels if
101 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
102 /// `user_channel_id` will be randomized for an inbound channel.
104 /// This field will be zero for a payment that was serialized prior to LDK version 0.0.117. (This
105 /// should only happen in the case that a payment was claimable prior to LDK version 0.0.117, but
106 /// was not actually claimed until after upgrading.)
108 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
109 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
110 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
111 pub user_channel_id: u128,
112 /// The block height at which this HTLC expires.
113 pub cltv_expiry: u32,
114 /// The amount (in msats) of this part of an MPP.
116 /// The extra fee our counterparty skimmed off the top of this HTLC, if any.
118 /// This value will always be 0 for [`ClaimedHTLC`]s serialized with LDK versions prior to
120 pub counterparty_skimmed_fee_msat: u64,
122 impl_writeable_tlv_based!(ClaimedHTLC, {
123 (0, channel_id, required),
124 (1, counterparty_skimmed_fee_msat, (default_value, 0u64)),
125 (2, user_channel_id, required),
126 (4, cltv_expiry, required),
127 (6, value_msat, required),
130 /// When the payment path failure took place and extra details about it. [`PathFailure::OnPath`] may
131 /// contain a [`NetworkUpdate`] that needs to be applied to the [`NetworkGraph`].
133 /// [`NetworkUpdate`]: crate::routing::gossip::NetworkUpdate
134 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
135 #[derive(Clone, Debug, Eq, PartialEq)]
136 pub enum PathFailure {
137 /// We failed to initially send the payment and no HTLC was committed to. Contains the relevant
140 /// The error surfaced from initial send.
143 /// A hop on the path failed to forward our payment.
145 /// If present, this [`NetworkUpdate`] should be applied to the [`NetworkGraph`] so that routing
146 /// decisions can take into account the update.
148 /// [`NetworkUpdate`]: crate::routing::gossip::NetworkUpdate
149 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
150 network_update: Option<NetworkUpdate>,
154 impl_writeable_tlv_based_enum_upgradable!(PathFailure,
156 (0, network_update, upgradable_option),
158 (2, InitialSend) => {
159 (0, err, upgradable_required),
163 #[derive(Clone, Debug, PartialEq, Eq)]
164 /// The reason the channel was closed. See individual variants for more details.
165 pub enum ClosureReason {
166 /// Closure generated from receiving a peer error message.
168 /// Our counterparty may have broadcasted their latest commitment state, and we have
170 CounterpartyForceClosed {
171 /// The error which the peer sent us.
173 /// Be careful about printing the peer_msg, a well-crafted message could exploit
174 /// a security vulnerability in the terminal emulator or the logging subsystem.
175 /// To be safe, use `Display` on `UntrustedString`
177 /// [`UntrustedString`]: crate::util::string::UntrustedString
178 peer_msg: UntrustedString,
180 /// Closure generated from [`ChannelManager::force_close_channel`], called by the user.
182 /// [`ChannelManager::force_close_channel`]: crate::ln::channelmanager::ChannelManager::force_close_channel.
184 /// The channel was closed after negotiating a cooperative close and we've now broadcasted
185 /// the cooperative close transaction. Note the shutdown may have been initiated by us.
186 //TODO: split between CounterpartyInitiated/LocallyInitiated
188 /// A commitment transaction was confirmed on chain, closing the channel. Most likely this
189 /// commitment transaction came from our counterparty, but it may also have come from
190 /// a copy of our own `ChannelMonitor`.
191 CommitmentTxConfirmed,
192 /// The funding transaction failed to confirm in a timely manner on an inbound channel.
194 /// Closure generated from processing an event, likely a HTLC forward/relay/reception.
196 /// A developer-readable error message which we generated.
199 /// The peer disconnected prior to funding completing. In this case the spec mandates that we
200 /// forget the channel entirely - we can attempt again if the peer reconnects.
202 /// This includes cases where we restarted prior to funding completion, including prior to the
203 /// initial [`ChannelMonitor`] persistence completing.
205 /// In LDK versions prior to 0.0.107 this could also occur if we were unable to connect to the
206 /// peer because of mutual incompatibility between us and our channel counterparty.
208 /// [`ChannelMonitor`]: crate::chain::channelmonitor::ChannelMonitor
210 /// Closure generated from `ChannelManager::read` if the [`ChannelMonitor`] is newer than
211 /// the [`ChannelManager`] deserialized.
213 /// [`ChannelMonitor`]: crate::chain::channelmonitor::ChannelMonitor
214 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
215 OutdatedChannelManager,
216 /// The counterparty requested a cooperative close of a channel that had not been funded yet.
217 /// The channel has been immediately closed.
218 CounterpartyCoopClosedUnfundedChannel,
219 /// Another channel in the same funding batch closed before the funding transaction
220 /// was ready to be broadcast.
224 impl core::fmt::Display for ClosureReason {
225 fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
226 f.write_str("Channel closed because ")?;
228 ClosureReason::CounterpartyForceClosed { peer_msg } => {
229 f.write_fmt(format_args!("counterparty force-closed with message: {}", peer_msg))
231 ClosureReason::HolderForceClosed => f.write_str("user manually force-closed the channel"),
232 ClosureReason::CooperativeClosure => f.write_str("the channel was cooperatively closed"),
233 ClosureReason::CommitmentTxConfirmed => f.write_str("commitment or closing transaction was confirmed on chain."),
234 ClosureReason::FundingTimedOut => write!(f, "funding transaction failed to confirm within {} blocks", FUNDING_CONF_DEADLINE_BLOCKS),
235 ClosureReason::ProcessingError { err } => {
236 f.write_str("of an exception: ")?;
239 ClosureReason::DisconnectedPeer => f.write_str("the peer disconnected prior to the channel being funded"),
240 ClosureReason::OutdatedChannelManager => f.write_str("the ChannelManager read from disk was stale compared to ChannelMonitor(s)"),
241 ClosureReason::CounterpartyCoopClosedUnfundedChannel => f.write_str("the peer requested the unfunded channel be closed"),
242 ClosureReason::FundingBatchClosure => f.write_str("another channel in the same funding batch closed"),
247 impl_writeable_tlv_based_enum_upgradable!(ClosureReason,
248 (0, CounterpartyForceClosed) => { (1, peer_msg, required) },
249 (1, FundingTimedOut) => {},
250 (2, HolderForceClosed) => {},
251 (6, CommitmentTxConfirmed) => {},
252 (4, CooperativeClosure) => {},
253 (8, ProcessingError) => { (1, err, required) },
254 (10, DisconnectedPeer) => {},
255 (12, OutdatedChannelManager) => {},
256 (13, CounterpartyCoopClosedUnfundedChannel) => {},
257 (15, FundingBatchClosure) => {}
260 /// Intended destination of a failed HTLC as indicated in [`Event::HTLCHandlingFailed`].
261 #[derive(Clone, Debug, PartialEq, Eq)]
262 pub enum HTLCDestination {
263 /// We tried forwarding to a channel but failed to do so. An example of such an instance is when
264 /// there is insufficient capacity in our outbound channel.
266 /// The `node_id` of the next node. For backwards compatibility, this field is
267 /// marked as optional, versions prior to 0.0.110 may not always be able to provide
268 /// counterparty node information.
269 node_id: Option<PublicKey>,
270 /// The outgoing `channel_id` between us and the next node.
271 channel_id: ChannelId,
273 /// Scenario where we are unsure of the next node to forward the HTLC to.
275 /// Short channel id we are requesting to forward an HTLC to.
276 requested_forward_scid: u64,
278 /// We couldn't forward to the outgoing scid. An example would be attempting to send a duplicate
281 /// Short channel id we are requesting to forward an HTLC to.
282 requested_forward_scid: u64
284 /// Failure scenario where an HTLC may have been forwarded to be intended for us,
285 /// but is invalid for some reason, so we reject it.
287 /// Some of the reasons may include:
289 /// * Excess HTLCs for a payment that we have already fully received, over-paying for the
291 /// * The counterparty node modified the HTLC in transit,
292 /// * A probing attack where an intermediary node is trying to detect if we are the ultimate
293 /// recipient for a payment.
295 /// The payment hash of the payment we attempted to process.
296 payment_hash: PaymentHash
300 impl_writeable_tlv_based_enum_upgradable!(HTLCDestination,
301 (0, NextHopChannel) => {
302 (0, node_id, required),
303 (2, channel_id, required),
305 (1, InvalidForward) => {
306 (0, requested_forward_scid, required),
308 (2, UnknownNextHop) => {
309 (0, requested_forward_scid, required),
311 (4, FailedPayment) => {
312 (0, payment_hash, required),
316 /// Will be used in [`Event::HTLCIntercepted`] to identify the next hop in the HTLC's path.
317 /// Currently only used in serialization for the sake of maintaining compatibility. More variants
318 /// will be added for general-purpose HTLC forward intercepts as well as trampoline forward
319 /// intercepts in upcoming work.
320 enum InterceptNextHop {
322 requested_next_hop_scid: u64,
326 impl_writeable_tlv_based_enum!(InterceptNextHop,
328 (0, requested_next_hop_scid, required),
332 /// The reason the payment failed. Used in [`Event::PaymentFailed`].
333 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
334 pub enum PaymentFailureReason {
335 /// The intended recipient rejected our payment.
337 /// The user chose to abandon this payment by calling [`ChannelManager::abandon_payment`].
339 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
341 /// We exhausted all of our retry attempts while trying to send the payment, or we
342 /// exhausted the [`Retry::Timeout`] if the user set one. If at any point a retry
343 /// attempt failed while being forwarded along the path, an [`Event::PaymentPathFailed`] will
344 /// have come before this.
346 /// [`Retry::Timeout`]: crate::ln::channelmanager::Retry::Timeout
348 /// The payment expired while retrying, based on the provided
349 /// [`PaymentParameters::expiry_time`].
351 /// [`PaymentParameters::expiry_time`]: crate::routing::router::PaymentParameters::expiry_time
353 /// We failed to find a route while retrying the payment.
355 /// This error should generally never happen. This likely means that there is a problem with
360 impl_writeable_tlv_based_enum!(PaymentFailureReason,
361 (0, RecipientRejected) => {},
362 (2, UserAbandoned) => {},
363 (4, RetriesExhausted) => {},
364 (6, PaymentExpired) => {},
365 (8, RouteNotFound) => {},
366 (10, UnexpectedError) => {}, ;
369 /// An Event which you should probably take some action in response to.
371 /// Note that while Writeable and Readable are implemented for Event, you probably shouldn't use
372 /// them directly as they don't round-trip exactly (for example FundingGenerationReady is never
373 /// written as it makes no sense to respond to it after reconnecting to peers).
374 #[derive(Clone, Debug, PartialEq, Eq)]
376 /// Used to indicate that the client should generate a funding transaction with the given
377 /// parameters and then call [`ChannelManager::funding_transaction_generated`].
378 /// Generated in [`ChannelManager`] message handling.
379 /// Note that *all inputs* in the funding transaction must spend SegWit outputs or your
380 /// counterparty can steal your funds!
382 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
383 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
384 FundingGenerationReady {
385 /// The random channel_id we picked which you'll need to pass into
386 /// [`ChannelManager::funding_transaction_generated`].
388 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
389 temporary_channel_id: ChannelId,
390 /// The counterparty's node_id, which you'll need to pass back into
391 /// [`ChannelManager::funding_transaction_generated`].
393 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
394 counterparty_node_id: PublicKey,
395 /// The value, in satoshis, that the output should have.
396 channel_value_satoshis: u64,
397 /// The script which should be used in the transaction output.
398 output_script: ScriptBuf,
399 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
400 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
401 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
402 /// `user_channel_id` will be randomized for an inbound channel. This may be zero for objects
403 /// serialized with LDK versions prior to 0.0.113.
405 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
406 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
407 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
408 user_channel_id: u128,
410 /// Indicates that we've been offered a payment and it needs to be claimed via calling
411 /// [`ChannelManager::claim_funds`] with the preimage given in [`PaymentPurpose`].
413 /// Note that if the preimage is not known, you should call
414 /// [`ChannelManager::fail_htlc_backwards`] or [`ChannelManager::fail_htlc_backwards_with_reason`]
415 /// to free up resources for this HTLC and avoid network congestion.
417 /// If [`Event::PaymentClaimable::onion_fields`] is `Some`, and includes custom TLVs with even type
418 /// numbers, you should use [`ChannelManager::fail_htlc_backwards_with_reason`] with
419 /// [`FailureCode::InvalidOnionPayload`] if you fail to understand and handle the contents, or
420 /// [`ChannelManager::claim_funds_with_known_custom_tlvs`] upon successful handling.
421 /// If you don't intend to check for custom TLVs, you can simply use
422 /// [`ChannelManager::claim_funds`], which will automatically fail back even custom TLVs.
424 /// If you fail to call [`ChannelManager::claim_funds`],
425 /// [`ChannelManager::claim_funds_with_known_custom_tlvs`],
426 /// [`ChannelManager::fail_htlc_backwards`], or
427 /// [`ChannelManager::fail_htlc_backwards_with_reason`] within the HTLC's timeout, the HTLC will
428 /// be automatically failed.
431 /// LDK will not stop an inbound payment from being paid multiple times, so multiple
432 /// `PaymentClaimable` events may be generated for the same payment. In such a case it is
433 /// polite (and required in the lightning specification) to fail the payment the second time
434 /// and give the sender their money back rather than accepting double payment.
437 /// This event used to be called `PaymentReceived` in LDK versions 0.0.112 and earlier.
439 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
440 /// [`ChannelManager::claim_funds_with_known_custom_tlvs`]: crate::ln::channelmanager::ChannelManager::claim_funds_with_known_custom_tlvs
441 /// [`FailureCode::InvalidOnionPayload`]: crate::ln::channelmanager::FailureCode::InvalidOnionPayload
442 /// [`ChannelManager::fail_htlc_backwards`]: crate::ln::channelmanager::ChannelManager::fail_htlc_backwards
443 /// [`ChannelManager::fail_htlc_backwards_with_reason`]: crate::ln::channelmanager::ChannelManager::fail_htlc_backwards_with_reason
445 /// The node that will receive the payment after it has been claimed.
446 /// This is useful to identify payments received via [phantom nodes].
447 /// This field will always be filled in when the event was generated by LDK versions
448 /// 0.0.113 and above.
450 /// [phantom nodes]: crate::sign::PhantomKeysManager
451 receiver_node_id: Option<PublicKey>,
452 /// The hash for which the preimage should be handed to the ChannelManager. Note that LDK will
453 /// not stop you from registering duplicate payment hashes for inbound payments.
454 payment_hash: PaymentHash,
455 /// The fields in the onion which were received with each HTLC. Only fields which were
456 /// identical in each HTLC involved in the payment will be included here.
458 /// Payments received on LDK versions prior to 0.0.115 will have this field unset.
459 onion_fields: Option<RecipientOnionFields>,
460 /// The value, in thousandths of a satoshi, that this payment is claimable for. May be greater
461 /// than the invoice amount.
463 /// May be less than the invoice amount if [`ChannelConfig::accept_underpaying_htlcs`] is set
464 /// and the previous hop took an extra fee.
467 /// If [`ChannelConfig::accept_underpaying_htlcs`] is set and you claim without verifying this
468 /// field, you may lose money!
470 /// [`ChannelConfig::accept_underpaying_htlcs`]: crate::util::config::ChannelConfig::accept_underpaying_htlcs
472 /// The value, in thousands of a satoshi, that was skimmed off of this payment as an extra fee
473 /// taken by our channel counterparty.
475 /// Will always be 0 unless [`ChannelConfig::accept_underpaying_htlcs`] is set.
477 /// [`ChannelConfig::accept_underpaying_htlcs`]: crate::util::config::ChannelConfig::accept_underpaying_htlcs
478 counterparty_skimmed_fee_msat: u64,
479 /// Information for claiming this received payment, based on whether the purpose of the
480 /// payment is to pay an invoice or to send a spontaneous payment.
481 purpose: PaymentPurpose,
482 /// The `channel_id` indicating over which channel we received the payment.
483 via_channel_id: Option<ChannelId>,
484 /// The `user_channel_id` indicating over which channel we received the payment.
485 via_user_channel_id: Option<u128>,
486 /// The block height at which this payment will be failed back and will no longer be
487 /// eligible for claiming.
489 /// Prior to this height, a call to [`ChannelManager::claim_funds`] is guaranteed to
490 /// succeed, however you should wait for [`Event::PaymentClaimed`] to be sure.
492 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
493 claim_deadline: Option<u32>,
495 /// Indicates a payment has been claimed and we've received money!
497 /// This most likely occurs when [`ChannelManager::claim_funds`] has been called in response
498 /// to an [`Event::PaymentClaimable`]. However, if we previously crashed during a
499 /// [`ChannelManager::claim_funds`] call you may see this event without a corresponding
500 /// [`Event::PaymentClaimable`] event.
503 /// LDK will not stop an inbound payment from being paid multiple times, so multiple
504 /// `PaymentClaimable` events may be generated for the same payment. If you then call
505 /// [`ChannelManager::claim_funds`] twice for the same [`Event::PaymentClaimable`] you may get
506 /// multiple `PaymentClaimed` events.
508 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
510 /// The node that received the payment.
511 /// This is useful to identify payments which were received via [phantom nodes].
512 /// This field will always be filled in when the event was generated by LDK versions
513 /// 0.0.113 and above.
515 /// [phantom nodes]: crate::sign::PhantomKeysManager
516 receiver_node_id: Option<PublicKey>,
517 /// The payment hash of the claimed payment. Note that LDK will not stop you from
518 /// registering duplicate payment hashes for inbound payments.
519 payment_hash: PaymentHash,
520 /// The value, in thousandths of a satoshi, that this payment is for. May be greater than the
523 /// The purpose of the claimed payment, i.e. whether the payment was for an invoice or a
524 /// spontaneous payment.
525 purpose: PaymentPurpose,
526 /// The HTLCs that comprise the claimed payment. This will be empty for events serialized prior
527 /// to LDK version 0.0.117.
528 htlcs: Vec<ClaimedHTLC>,
529 /// The sender-intended sum total of all the MPP parts. This will be `None` for events
530 /// serialized prior to LDK version 0.0.117.
531 sender_intended_total_msat: Option<u64>,
533 /// Indicates a request for an invoice failed to yield a response in a reasonable amount of time
534 /// or was explicitly abandoned by [`ChannelManager::abandon_payment`]. This may be for an
535 /// [`InvoiceRequest`] sent for an [`Offer`] or for a [`Refund`] that hasn't been redeemed.
537 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
538 /// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
539 /// [`Offer`]: crate::offers::offer::Offer
540 /// [`Refund`]: crate::offers::refund::Refund
541 InvoiceRequestFailed {
542 /// The `payment_id` to have been associated with payment for the requested invoice.
543 payment_id: PaymentId,
545 /// Indicates an outbound payment we made succeeded (i.e. it made it all the way to its target
546 /// and we got back the payment preimage for it).
548 /// Note for MPP payments: in rare cases, this event may be preceded by a `PaymentPathFailed`
549 /// event. In this situation, you SHOULD treat this payment as having succeeded.
551 /// The `payment_id` passed to [`ChannelManager::send_payment`].
553 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
554 payment_id: Option<PaymentId>,
555 /// The preimage to the hash given to ChannelManager::send_payment.
556 /// Note that this serves as a payment receipt, if you wish to have such a thing, you must
557 /// store it somehow!
558 payment_preimage: PaymentPreimage,
559 /// The hash that was given to [`ChannelManager::send_payment`].
561 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
562 payment_hash: PaymentHash,
563 /// The total fee which was spent at intermediate hops in this payment, across all paths.
565 /// Note that, like [`Route::get_total_fees`] this does *not* include any potential
566 /// overpayment to the recipient node.
568 /// If the recipient or an intermediate node misbehaves and gives us free money, this may
569 /// overstate the amount paid, though this is unlikely.
571 /// [`Route::get_total_fees`]: crate::routing::router::Route::get_total_fees
572 fee_paid_msat: Option<u64>,
574 /// Indicates an outbound payment failed. Individual [`Event::PaymentPathFailed`] events
575 /// provide failure information for each path attempt in the payment, including retries.
577 /// This event is provided once there are no further pending HTLCs for the payment and the
578 /// payment is no longer retryable, due either to the [`Retry`] provided or
579 /// [`ChannelManager::abandon_payment`] having been called for the corresponding payment.
581 /// In exceedingly rare cases, it is possible that an [`Event::PaymentFailed`] is generated for
582 /// a payment after an [`Event::PaymentSent`] event for this same payment has already been
583 /// received and processed. In this case, the [`Event::PaymentFailed`] event MUST be ignored,
584 /// and the payment MUST be treated as having succeeded.
586 /// [`Retry`]: crate::ln::channelmanager::Retry
587 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
589 /// The `payment_id` passed to [`ChannelManager::send_payment`].
591 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
592 payment_id: PaymentId,
593 /// The hash that was given to [`ChannelManager::send_payment`].
595 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
596 payment_hash: PaymentHash,
597 /// The reason the payment failed. This is only `None` for events generated or serialized
598 /// by versions prior to 0.0.115.
599 reason: Option<PaymentFailureReason>,
601 /// Indicates that a path for an outbound payment was successful.
603 /// Always generated after [`Event::PaymentSent`] and thus useful for scoring channels. See
604 /// [`Event::PaymentSent`] for obtaining the payment preimage.
605 PaymentPathSuccessful {
606 /// The `payment_id` passed to [`ChannelManager::send_payment`].
608 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
609 payment_id: PaymentId,
610 /// The hash that was given to [`ChannelManager::send_payment`].
612 /// This will be `Some` for all payments which completed on LDK 0.0.104 or later.
614 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
615 payment_hash: Option<PaymentHash>,
616 /// The payment path that was successful.
618 /// May contain a closed channel if the HTLC sent along the path was fulfilled on chain.
621 /// Indicates an outbound HTLC we sent failed, likely due to an intermediary node being unable to
624 /// Note that this does *not* indicate that all paths for an MPP payment have failed, see
625 /// [`Event::PaymentFailed`].
627 /// See [`ChannelManager::abandon_payment`] for giving up on this payment before its retries have
630 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
632 /// The `payment_id` passed to [`ChannelManager::send_payment`].
634 /// This will be `Some` for all payment paths which failed on LDK 0.0.103 or later.
636 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
637 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
638 payment_id: Option<PaymentId>,
639 /// The hash that was given to [`ChannelManager::send_payment`].
641 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
642 payment_hash: PaymentHash,
643 /// Indicates the payment was rejected for some reason by the recipient. This implies that
644 /// the payment has failed, not just the route in question. If this is not set, the payment may
645 /// be retried via a different route.
646 payment_failed_permanently: bool,
647 /// Extra error details based on the failure type. May contain an update that needs to be
648 /// applied to the [`NetworkGraph`].
650 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
651 failure: PathFailure,
652 /// The payment path that failed.
654 /// The channel responsible for the failed payment path.
656 /// Note that for route hints or for the first hop in a path this may be an SCID alias and
657 /// may not refer to a channel in the public network graph. These aliases may also collide
658 /// with channels in the public network graph.
660 /// If this is `Some`, then the corresponding channel should be avoided when the payment is
661 /// retried. May be `None` for older [`Event`] serializations.
662 short_channel_id: Option<u64>,
664 error_code: Option<u16>,
666 error_data: Option<Vec<u8>>,
668 /// Indicates that a probe payment we sent returned successful, i.e., only failed at the destination.
670 /// The id returned by [`ChannelManager::send_probe`].
672 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
673 payment_id: PaymentId,
674 /// The hash generated by [`ChannelManager::send_probe`].
676 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
677 payment_hash: PaymentHash,
678 /// The payment path that was successful.
681 /// Indicates that a probe payment we sent failed at an intermediary node on the path.
683 /// The id returned by [`ChannelManager::send_probe`].
685 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
686 payment_id: PaymentId,
687 /// The hash generated by [`ChannelManager::send_probe`].
689 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
690 payment_hash: PaymentHash,
691 /// The payment path that failed.
693 /// The channel responsible for the failed probe.
695 /// Note that for route hints or for the first hop in a path this may be an SCID alias and
696 /// may not refer to a channel in the public network graph. These aliases may also collide
697 /// with channels in the public network graph.
698 short_channel_id: Option<u64>,
700 /// Used to indicate that [`ChannelManager::process_pending_htlc_forwards`] should be called at
701 /// a time in the future.
703 /// [`ChannelManager::process_pending_htlc_forwards`]: crate::ln::channelmanager::ChannelManager::process_pending_htlc_forwards
704 PendingHTLCsForwardable {
705 /// The minimum amount of time that should be waited prior to calling
706 /// process_pending_htlc_forwards. To increase the effort required to correlate payments,
707 /// you should wait a random amount of time in roughly the range (now + time_forwardable,
708 /// now + 5*time_forwardable).
709 time_forwardable: Duration,
711 /// Used to indicate that we've intercepted an HTLC forward. This event will only be generated if
712 /// you've encoded an intercept scid in the receiver's invoice route hints using
713 /// [`ChannelManager::get_intercept_scid`] and have set [`UserConfig::accept_intercept_htlcs`].
715 /// [`ChannelManager::forward_intercepted_htlc`] or
716 /// [`ChannelManager::fail_intercepted_htlc`] MUST be called in response to this event. See
717 /// their docs for more information.
719 /// [`ChannelManager::get_intercept_scid`]: crate::ln::channelmanager::ChannelManager::get_intercept_scid
720 /// [`UserConfig::accept_intercept_htlcs`]: crate::util::config::UserConfig::accept_intercept_htlcs
721 /// [`ChannelManager::forward_intercepted_htlc`]: crate::ln::channelmanager::ChannelManager::forward_intercepted_htlc
722 /// [`ChannelManager::fail_intercepted_htlc`]: crate::ln::channelmanager::ChannelManager::fail_intercepted_htlc
724 /// An id to help LDK identify which HTLC is being forwarded or failed.
725 intercept_id: InterceptId,
726 /// The fake scid that was programmed as the next hop's scid, generated using
727 /// [`ChannelManager::get_intercept_scid`].
729 /// [`ChannelManager::get_intercept_scid`]: crate::ln::channelmanager::ChannelManager::get_intercept_scid
730 requested_next_hop_scid: u64,
731 /// The payment hash used for this HTLC.
732 payment_hash: PaymentHash,
733 /// How many msats were received on the inbound edge of this HTLC.
734 inbound_amount_msat: u64,
735 /// How many msats the payer intended to route to the next node. Depending on the reason you are
736 /// intercepting this payment, you might take a fee by forwarding less than this amount.
737 /// Forwarding less than this amount may break compatibility with LDK versions prior to 0.0.116.
739 /// Note that LDK will NOT check that expected fees were factored into this value. You MUST
740 /// check that whatever fee you want has been included here or subtract it as required. Further,
741 /// LDK will not stop you from forwarding more than you received.
742 expected_outbound_amount_msat: u64,
744 /// Used to indicate that an output which you should know how to spend was confirmed on chain
745 /// and is now spendable.
746 /// Such an output will *not* ever be spent by rust-lightning, and are not at risk of your
747 /// counterparty spending them due to some kind of timeout. Thus, you need to store them
748 /// somewhere and spend them when you create on-chain transactions.
750 /// The outputs which you should store as spendable by you.
751 outputs: Vec<SpendableOutputDescriptor>,
752 /// The `channel_id` indicating which channel the spendable outputs belong to.
754 /// This will always be `Some` for events generated by LDK versions 0.0.117 and above.
755 channel_id: Option<ChannelId>,
757 /// This event is generated when a payment has been successfully forwarded through us and a
758 /// forwarding fee earned.
760 /// The incoming channel between the previous node and us. This is only `None` for events
761 /// generated or serialized by versions prior to 0.0.107.
762 prev_channel_id: Option<ChannelId>,
763 /// The outgoing channel between the next node and us. This is only `None` for events
764 /// generated or serialized by versions prior to 0.0.107.
765 next_channel_id: Option<ChannelId>,
766 /// The fee, in milli-satoshis, which was earned as a result of the payment.
768 /// Note that if we force-closed the channel over which we forwarded an HTLC while the HTLC
769 /// was pending, the amount the next hop claimed will have been rounded down to the nearest
770 /// whole satoshi. Thus, the fee calculated here may be higher than expected as we still
771 /// claimed the full value in millisatoshis from the source. In this case,
772 /// `claim_from_onchain_tx` will be set.
774 /// If the channel which sent us the payment has been force-closed, we will claim the funds
775 /// via an on-chain transaction. In that case we do not yet know the on-chain transaction
776 /// fees which we will spend and will instead set this to `None`. It is possible duplicate
777 /// `PaymentForwarded` events are generated for the same payment iff `fee_earned_msat` is
779 fee_earned_msat: Option<u64>,
780 /// If this is `true`, the forwarded HTLC was claimed by our counterparty via an on-chain
782 claim_from_onchain_tx: bool,
783 /// The final amount forwarded, in milli-satoshis, after the fee is deducted.
785 /// The caveat described above the `fee_earned_msat` field applies here as well.
786 outbound_amount_forwarded_msat: Option<u64>,
788 /// Used to indicate that a channel with the given `channel_id` is being opened and pending
789 /// confirmation on-chain.
791 /// This event is emitted when the funding transaction has been signed and is broadcast to the
792 /// network. For 0conf channels it will be immediately followed by the corresponding
793 /// [`Event::ChannelReady`] event.
795 /// The `channel_id` of the channel that is pending confirmation.
796 channel_id: ChannelId,
797 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
798 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
799 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
800 /// `user_channel_id` will be randomized for an inbound channel.
802 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
803 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
804 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
805 user_channel_id: u128,
806 /// The `temporary_channel_id` this channel used to be known by during channel establishment.
808 /// Will be `None` for channels created prior to LDK version 0.0.115.
809 former_temporary_channel_id: Option<ChannelId>,
810 /// The `node_id` of the channel counterparty.
811 counterparty_node_id: PublicKey,
812 /// The outpoint of the channel's funding transaction.
813 funding_txo: OutPoint,
815 /// Used to indicate that a channel with the given `channel_id` is ready to
816 /// be used. This event is emitted either when the funding transaction has been confirmed
817 /// on-chain, or, in case of a 0conf channel, when both parties have confirmed the channel
820 /// The `channel_id` of the channel that is ready.
821 channel_id: ChannelId,
822 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
823 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
824 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
825 /// `user_channel_id` will be randomized for an inbound channel.
827 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
828 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
829 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
830 user_channel_id: u128,
831 /// The `node_id` of the channel counterparty.
832 counterparty_node_id: PublicKey,
833 /// The features that this channel will operate with.
834 channel_type: ChannelTypeFeatures,
836 /// Used to indicate that a previously opened channel with the given `channel_id` is in the
837 /// process of closure.
839 /// Note that this event is only triggered for accepted channels: if the
840 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true and the channel is
841 /// rejected, no `ChannelClosed` event will be sent.
843 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
844 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
846 /// The `channel_id` of the channel which has been closed. Note that on-chain transactions
847 /// resolving the channel are likely still awaiting confirmation.
848 channel_id: ChannelId,
849 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
850 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
851 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
852 /// `user_channel_id` will be randomized for inbound channels.
853 /// This may be zero for inbound channels serialized prior to 0.0.113 and will always be
854 /// zero for objects serialized with LDK versions prior to 0.0.102.
856 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
857 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
858 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
859 user_channel_id: u128,
860 /// The reason the channel was closed.
861 reason: ClosureReason,
862 /// Counterparty in the closed channel.
864 /// This field will be `None` for objects serialized prior to LDK 0.0.117.
865 counterparty_node_id: Option<PublicKey>,
866 /// Channel capacity of the closing channel (sats).
868 /// This field will be `None` for objects serialized prior to LDK 0.0.117.
869 channel_capacity_sats: Option<u64>,
871 /// Used to indicate to the user that they can abandon the funding transaction and recycle the
872 /// inputs for another purpose.
874 /// This event is not guaranteed to be generated for channels that are closed due to a restart.
876 /// The channel_id of the channel which has been closed.
877 channel_id: ChannelId,
878 /// The full transaction received from the user
879 transaction: Transaction
881 /// Indicates a request to open a new channel by a peer.
883 /// To accept the request, call [`ChannelManager::accept_inbound_channel`]. To reject the request,
884 /// call [`ChannelManager::force_close_without_broadcasting_txn`]. Note that a ['ChannelClosed`]
885 /// event will _not_ be triggered if the channel is rejected.
887 /// The event is only triggered when a new open channel request is received and the
888 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true.
890 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
891 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
892 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
894 /// The temporary channel ID of the channel requested to be opened.
896 /// When responding to the request, the `temporary_channel_id` should be passed
897 /// back to the ChannelManager through [`ChannelManager::accept_inbound_channel`] to accept,
898 /// or through [`ChannelManager::force_close_without_broadcasting_txn`] to reject.
900 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
901 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
902 temporary_channel_id: ChannelId,
903 /// The node_id of the counterparty requesting to open the channel.
905 /// When responding to the request, the `counterparty_node_id` should be passed
906 /// back to the `ChannelManager` through [`ChannelManager::accept_inbound_channel`] to
907 /// accept the request, or through [`ChannelManager::force_close_without_broadcasting_txn`] to reject the
910 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
911 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
912 counterparty_node_id: PublicKey,
913 /// The channel value of the requested channel.
914 funding_satoshis: u64,
915 /// Our starting balance in the channel if the request is accepted, in milli-satoshi.
917 /// The features that this channel will operate with. If you reject the channel, a
918 /// well-behaved counterparty may automatically re-attempt the channel with a new set of
921 /// Note that if [`ChannelTypeFeatures::supports_scid_privacy`] returns true on this type,
922 /// the resulting [`ChannelManager`] will not be readable by versions of LDK prior to
925 /// Furthermore, note that if [`ChannelTypeFeatures::supports_zero_conf`] returns true on this type,
926 /// the resulting [`ChannelManager`] will not be readable by versions of LDK prior to
927 /// 0.0.107. Channels setting this type also need to get manually accepted via
928 /// [`crate::ln::channelmanager::ChannelManager::accept_inbound_channel_from_trusted_peer_0conf`],
929 /// or will be rejected otherwise.
931 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
932 channel_type: ChannelTypeFeatures,
934 /// Indicates that the HTLC was accepted, but could not be processed when or after attempting to
937 /// Some scenarios where this event may be sent include:
938 /// * Insufficient capacity in the outbound channel
939 /// * While waiting to forward the HTLC, the channel it is meant to be forwarded through closes
940 /// * When an unknown SCID is requested for forwarding a payment.
941 /// * Expected MPP amount has already been reached
942 /// * The HTLC has timed out
944 /// This event, however, does not get generated if an HTLC fails to meet the forwarding
945 /// requirements (i.e. insufficient fees paid, or a CLTV that is too soon).
947 /// The channel over which the HTLC was received.
948 prev_channel_id: ChannelId,
949 /// Destination of the HTLC that failed to be processed.
950 failed_next_destination: HTLCDestination,
952 /// Indicates that a transaction originating from LDK needs to have its fee bumped. This event
953 /// requires confirmed external funds to be readily available to spend.
955 /// LDK does not currently generate this event unless the
956 /// [`ChannelHandshakeConfig::negotiate_anchors_zero_fee_htlc_tx`] config flag is set to true.
957 /// It is limited to the scope of channels with anchor outputs.
959 /// [`ChannelHandshakeConfig::negotiate_anchors_zero_fee_htlc_tx`]: crate::util::config::ChannelHandshakeConfig::negotiate_anchors_zero_fee_htlc_tx
960 BumpTransaction(BumpTransactionEvent),
963 impl Writeable for Event {
964 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
966 &Event::FundingGenerationReady { .. } => {
968 // We never write out FundingGenerationReady events as, upon disconnection, peers
969 // drop any channels which have not yet exchanged funding_signed.
971 &Event::PaymentClaimable { ref payment_hash, ref amount_msat, counterparty_skimmed_fee_msat,
972 ref purpose, ref receiver_node_id, ref via_channel_id, ref via_user_channel_id,
973 ref claim_deadline, ref onion_fields
976 let mut payment_secret = None;
977 let payment_preimage;
979 PaymentPurpose::InvoicePayment { payment_preimage: preimage, payment_secret: secret } => {
980 payment_secret = Some(secret);
981 payment_preimage = *preimage;
983 PaymentPurpose::SpontaneousPayment(preimage) => {
984 payment_preimage = Some(*preimage);
987 let skimmed_fee_opt = if counterparty_skimmed_fee_msat == 0 { None }
988 else { Some(counterparty_skimmed_fee_msat) };
989 write_tlv_fields!(writer, {
990 (0, payment_hash, required),
991 (1, receiver_node_id, option),
992 (2, payment_secret, option),
993 (3, via_channel_id, option),
994 (4, amount_msat, required),
995 (5, via_user_channel_id, option),
996 // Type 6 was `user_payment_id` on 0.0.103 and earlier
997 (7, claim_deadline, option),
998 (8, payment_preimage, option),
999 (9, onion_fields, option),
1000 (10, skimmed_fee_opt, option),
1003 &Event::PaymentSent { ref payment_id, ref payment_preimage, ref payment_hash, ref fee_paid_msat } => {
1005 write_tlv_fields!(writer, {
1006 (0, payment_preimage, required),
1007 (1, payment_hash, required),
1008 (3, payment_id, option),
1009 (5, fee_paid_msat, option),
1012 &Event::PaymentPathFailed {
1013 ref payment_id, ref payment_hash, ref payment_failed_permanently, ref failure,
1014 ref path, ref short_channel_id,
1022 error_code.write(writer)?;
1024 error_data.write(writer)?;
1025 write_tlv_fields!(writer, {
1026 (0, payment_hash, required),
1027 (1, None::<NetworkUpdate>, option), // network_update in LDK versions prior to 0.0.114
1028 (2, payment_failed_permanently, required),
1029 (3, false, required), // all_paths_failed in LDK versions prior to 0.0.114
1030 (4, path.blinded_tail, option),
1031 (5, path.hops, required_vec),
1032 (7, short_channel_id, option),
1033 (9, None::<RouteParameters>, option), // retry in LDK versions prior to 0.0.115
1034 (11, payment_id, option),
1035 (13, failure, required),
1038 &Event::PendingHTLCsForwardable { time_forwardable: _ } => {
1040 // Note that we now ignore these on the read end as we'll re-generate them in
1041 // ChannelManager, we write them here only for backwards compatibility.
1043 &Event::SpendableOutputs { ref outputs, channel_id } => {
1045 write_tlv_fields!(writer, {
1046 (0, WithoutLength(outputs), required),
1047 (1, channel_id, option),
1050 &Event::HTLCIntercepted { requested_next_hop_scid, payment_hash, inbound_amount_msat, expected_outbound_amount_msat, intercept_id } => {
1052 let intercept_scid = InterceptNextHop::FakeScid { requested_next_hop_scid };
1053 write_tlv_fields!(writer, {
1054 (0, intercept_id, required),
1055 (2, intercept_scid, required),
1056 (4, payment_hash, required),
1057 (6, inbound_amount_msat, required),
1058 (8, expected_outbound_amount_msat, required),
1061 &Event::PaymentForwarded {
1062 fee_earned_msat, prev_channel_id, claim_from_onchain_tx,
1063 next_channel_id, outbound_amount_forwarded_msat
1066 write_tlv_fields!(writer, {
1067 (0, fee_earned_msat, option),
1068 (1, prev_channel_id, option),
1069 (2, claim_from_onchain_tx, required),
1070 (3, next_channel_id, option),
1071 (5, outbound_amount_forwarded_msat, option),
1074 &Event::ChannelClosed { ref channel_id, ref user_channel_id, ref reason,
1075 ref counterparty_node_id, ref channel_capacity_sats
1078 // `user_channel_id` used to be a single u64 value. In order to remain backwards
1079 // compatible with versions prior to 0.0.113, the u128 is serialized as two
1080 // separate u64 values.
1081 let user_channel_id_low = *user_channel_id as u64;
1082 let user_channel_id_high = (*user_channel_id >> 64) as u64;
1083 write_tlv_fields!(writer, {
1084 (0, channel_id, required),
1085 (1, user_channel_id_low, required),
1086 (2, reason, required),
1087 (3, user_channel_id_high, required),
1088 (5, counterparty_node_id, option),
1089 (7, channel_capacity_sats, option),
1092 &Event::DiscardFunding { ref channel_id, ref transaction } => {
1093 11u8.write(writer)?;
1094 write_tlv_fields!(writer, {
1095 (0, channel_id, required),
1096 (2, transaction, required)
1099 &Event::PaymentPathSuccessful { ref payment_id, ref payment_hash, ref path } => {
1100 13u8.write(writer)?;
1101 write_tlv_fields!(writer, {
1102 (0, payment_id, required),
1103 (2, payment_hash, option),
1104 (4, path.hops, required_vec),
1105 (6, path.blinded_tail, option),
1108 &Event::PaymentFailed { ref payment_id, ref payment_hash, ref reason } => {
1109 15u8.write(writer)?;
1110 write_tlv_fields!(writer, {
1111 (0, payment_id, required),
1112 (1, reason, option),
1113 (2, payment_hash, required),
1116 &Event::OpenChannelRequest { .. } => {
1117 17u8.write(writer)?;
1118 // We never write the OpenChannelRequest events as, upon disconnection, peers
1119 // drop any channels which have not yet exchanged funding_signed.
1121 &Event::PaymentClaimed { ref payment_hash, ref amount_msat, ref purpose, ref receiver_node_id, ref htlcs, ref sender_intended_total_msat } => {
1122 19u8.write(writer)?;
1123 write_tlv_fields!(writer, {
1124 (0, payment_hash, required),
1125 (1, receiver_node_id, option),
1126 (2, purpose, required),
1127 (4, amount_msat, required),
1128 (5, *htlcs, optional_vec),
1129 (7, sender_intended_total_msat, option),
1132 &Event::ProbeSuccessful { ref payment_id, ref payment_hash, ref path } => {
1133 21u8.write(writer)?;
1134 write_tlv_fields!(writer, {
1135 (0, payment_id, required),
1136 (2, payment_hash, required),
1137 (4, path.hops, required_vec),
1138 (6, path.blinded_tail, option),
1141 &Event::ProbeFailed { ref payment_id, ref payment_hash, ref path, ref short_channel_id } => {
1142 23u8.write(writer)?;
1143 write_tlv_fields!(writer, {
1144 (0, payment_id, required),
1145 (2, payment_hash, required),
1146 (4, path.hops, required_vec),
1147 (6, short_channel_id, option),
1148 (8, path.blinded_tail, option),
1151 &Event::HTLCHandlingFailed { ref prev_channel_id, ref failed_next_destination } => {
1152 25u8.write(writer)?;
1153 write_tlv_fields!(writer, {
1154 (0, prev_channel_id, required),
1155 (2, failed_next_destination, required),
1158 &Event::BumpTransaction(ref event)=> {
1159 27u8.write(writer)?;
1161 // We never write the ChannelClose|HTLCResolution events as they'll be replayed
1162 // upon restarting anyway if they remain unresolved.
1163 BumpTransactionEvent::ChannelClose { .. } => {}
1164 BumpTransactionEvent::HTLCResolution { .. } => {}
1166 write_tlv_fields!(writer, {}); // Write a length field for forwards compat
1168 &Event::ChannelReady { ref channel_id, ref user_channel_id, ref counterparty_node_id, ref channel_type } => {
1169 29u8.write(writer)?;
1170 write_tlv_fields!(writer, {
1171 (0, channel_id, required),
1172 (2, user_channel_id, required),
1173 (4, counterparty_node_id, required),
1174 (6, channel_type, required),
1177 &Event::ChannelPending { ref channel_id, ref user_channel_id, ref former_temporary_channel_id, ref counterparty_node_id, ref funding_txo } => {
1178 31u8.write(writer)?;
1179 write_tlv_fields!(writer, {
1180 (0, channel_id, required),
1181 (2, user_channel_id, required),
1182 (4, former_temporary_channel_id, required),
1183 (6, counterparty_node_id, required),
1184 (8, funding_txo, required),
1187 &Event::InvoiceRequestFailed { ref payment_id } => {
1188 33u8.write(writer)?;
1189 write_tlv_fields!(writer, {
1190 (0, payment_id, required),
1193 // Note that, going forward, all new events must only write data inside of
1194 // `write_tlv_fields`. Versions 0.0.101+ will ignore odd-numbered events that write
1195 // data via `write_tlv_fields`.
1200 impl MaybeReadable for Event {
1201 fn read<R: io::Read>(reader: &mut R) -> Result<Option<Self>, msgs::DecodeError> {
1202 match Readable::read(reader)? {
1203 // Note that we do not write a length-prefixed TLV for FundingGenerationReady events,
1204 // unlike all other events, thus we return immediately here.
1208 let mut payment_hash = PaymentHash([0; 32]);
1209 let mut payment_preimage = None;
1210 let mut payment_secret = None;
1211 let mut amount_msat = 0;
1212 let mut counterparty_skimmed_fee_msat_opt = None;
1213 let mut receiver_node_id = None;
1214 let mut _user_payment_id = None::<u64>; // Used in 0.0.103 and earlier, no longer written in 0.0.116+.
1215 let mut via_channel_id = None;
1216 let mut claim_deadline = None;
1217 let mut via_user_channel_id = None;
1218 let mut onion_fields = None;
1219 read_tlv_fields!(reader, {
1220 (0, payment_hash, required),
1221 (1, receiver_node_id, option),
1222 (2, payment_secret, option),
1223 (3, via_channel_id, option),
1224 (4, amount_msat, required),
1225 (5, via_user_channel_id, option),
1226 (6, _user_payment_id, option),
1227 (7, claim_deadline, option),
1228 (8, payment_preimage, option),
1229 (9, onion_fields, option),
1230 (10, counterparty_skimmed_fee_msat_opt, option),
1232 let purpose = match payment_secret {
1233 Some(secret) => PaymentPurpose::InvoicePayment {
1235 payment_secret: secret
1237 None if payment_preimage.is_some() => PaymentPurpose::SpontaneousPayment(payment_preimage.unwrap()),
1238 None => return Err(msgs::DecodeError::InvalidValue),
1240 Ok(Some(Event::PaymentClaimable {
1244 counterparty_skimmed_fee_msat: counterparty_skimmed_fee_msat_opt.unwrap_or(0),
1247 via_user_channel_id,
1256 let mut payment_preimage = PaymentPreimage([0; 32]);
1257 let mut payment_hash = None;
1258 let mut payment_id = None;
1259 let mut fee_paid_msat = None;
1260 read_tlv_fields!(reader, {
1261 (0, payment_preimage, required),
1262 (1, payment_hash, option),
1263 (3, payment_id, option),
1264 (5, fee_paid_msat, option),
1266 if payment_hash.is_none() {
1267 payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0[..]).to_byte_array()));
1269 Ok(Some(Event::PaymentSent {
1272 payment_hash: payment_hash.unwrap(),
1281 let error_code = Readable::read(reader)?;
1283 let error_data = Readable::read(reader)?;
1284 let mut payment_hash = PaymentHash([0; 32]);
1285 let mut payment_failed_permanently = false;
1286 let mut network_update = None;
1287 let mut blinded_tail: Option<BlindedTail> = None;
1288 let mut path: Option<Vec<RouteHop>> = Some(vec![]);
1289 let mut short_channel_id = None;
1290 let mut payment_id = None;
1291 let mut failure_opt = None;
1292 read_tlv_fields!(reader, {
1293 (0, payment_hash, required),
1294 (1, network_update, upgradable_option),
1295 (2, payment_failed_permanently, required),
1296 (4, blinded_tail, option),
1297 // Added as a part of LDK 0.0.101 and always filled in since.
1298 // Defaults to an empty Vec, though likely should have been `Option`al.
1299 (5, path, optional_vec),
1300 (7, short_channel_id, option),
1301 (11, payment_id, option),
1302 (13, failure_opt, upgradable_option),
1304 let failure = failure_opt.unwrap_or_else(|| PathFailure::OnPath { network_update });
1305 Ok(Some(Event::PaymentPathFailed {
1308 payment_failed_permanently,
1310 path: Path { hops: path.unwrap(), blinded_tail },
1323 let mut outputs = WithoutLength(Vec::new());
1324 let mut channel_id: Option<ChannelId> = None;
1325 read_tlv_fields!(reader, {
1326 (0, outputs, required),
1327 (1, channel_id, option),
1329 Ok(Some(Event::SpendableOutputs { outputs: outputs.0, channel_id }))
1334 let mut payment_hash = PaymentHash([0; 32]);
1335 let mut intercept_id = InterceptId([0; 32]);
1336 let mut requested_next_hop_scid = InterceptNextHop::FakeScid { requested_next_hop_scid: 0 };
1337 let mut inbound_amount_msat = 0;
1338 let mut expected_outbound_amount_msat = 0;
1339 read_tlv_fields!(reader, {
1340 (0, intercept_id, required),
1341 (2, requested_next_hop_scid, required),
1342 (4, payment_hash, required),
1343 (6, inbound_amount_msat, required),
1344 (8, expected_outbound_amount_msat, required),
1346 let next_scid = match requested_next_hop_scid {
1347 InterceptNextHop::FakeScid { requested_next_hop_scid: scid } => scid
1349 Ok(Some(Event::HTLCIntercepted {
1351 requested_next_hop_scid: next_scid,
1352 inbound_amount_msat,
1353 expected_outbound_amount_msat,
1359 let mut fee_earned_msat = None;
1360 let mut prev_channel_id = None;
1361 let mut claim_from_onchain_tx = false;
1362 let mut next_channel_id = None;
1363 let mut outbound_amount_forwarded_msat = None;
1364 read_tlv_fields!(reader, {
1365 (0, fee_earned_msat, option),
1366 (1, prev_channel_id, option),
1367 (2, claim_from_onchain_tx, required),
1368 (3, next_channel_id, option),
1369 (5, outbound_amount_forwarded_msat, option),
1371 Ok(Some(Event::PaymentForwarded {
1372 fee_earned_msat, prev_channel_id, claim_from_onchain_tx, next_channel_id,
1373 outbound_amount_forwarded_msat
1380 let mut channel_id = ChannelId::new_zero();
1381 let mut reason = UpgradableRequired(None);
1382 let mut user_channel_id_low_opt: Option<u64> = None;
1383 let mut user_channel_id_high_opt: Option<u64> = None;
1384 let mut counterparty_node_id = None;
1385 let mut channel_capacity_sats = None;
1386 read_tlv_fields!(reader, {
1387 (0, channel_id, required),
1388 (1, user_channel_id_low_opt, option),
1389 (2, reason, upgradable_required),
1390 (3, user_channel_id_high_opt, option),
1391 (5, counterparty_node_id, option),
1392 (7, channel_capacity_sats, option),
1395 // `user_channel_id` used to be a single u64 value. In order to remain
1396 // backwards compatible with versions prior to 0.0.113, the u128 is serialized
1397 // as two separate u64 values.
1398 let user_channel_id = (user_channel_id_low_opt.unwrap_or(0) as u128) +
1399 ((user_channel_id_high_opt.unwrap_or(0) as u128) << 64);
1401 Ok(Some(Event::ChannelClosed { channel_id, user_channel_id, reason: _init_tlv_based_struct_field!(reason, upgradable_required),
1402 counterparty_node_id, channel_capacity_sats }))
1408 let mut channel_id = ChannelId::new_zero();
1409 let mut transaction = Transaction{ version: 2, lock_time: LockTime::ZERO, input: Vec::new(), output: Vec::new() };
1410 read_tlv_fields!(reader, {
1411 (0, channel_id, required),
1412 (2, transaction, required),
1414 Ok(Some(Event::DiscardFunding { channel_id, transaction } ))
1420 _init_and_read_len_prefixed_tlv_fields!(reader, {
1421 (0, payment_id, required),
1422 (2, payment_hash, option),
1423 (4, path, required_vec),
1424 (6, blinded_tail, option),
1426 Ok(Some(Event::PaymentPathSuccessful {
1427 payment_id: payment_id.0.unwrap(),
1429 path: Path { hops: path, blinded_tail },
1436 let mut payment_hash = PaymentHash([0; 32]);
1437 let mut payment_id = PaymentId([0; 32]);
1438 let mut reason = None;
1439 read_tlv_fields!(reader, {
1440 (0, payment_id, required),
1441 (1, reason, upgradable_option),
1442 (2, payment_hash, required),
1444 Ok(Some(Event::PaymentFailed {
1453 // Value 17 is used for `Event::OpenChannelRequest`.
1458 let mut payment_hash = PaymentHash([0; 32]);
1459 let mut purpose = UpgradableRequired(None);
1460 let mut amount_msat = 0;
1461 let mut receiver_node_id = None;
1462 let mut htlcs: Option<Vec<ClaimedHTLC>> = Some(vec![]);
1463 let mut sender_intended_total_msat: Option<u64> = None;
1464 read_tlv_fields!(reader, {
1465 (0, payment_hash, required),
1466 (1, receiver_node_id, option),
1467 (2, purpose, upgradable_required),
1468 (4, amount_msat, required),
1469 (5, htlcs, optional_vec),
1470 (7, sender_intended_total_msat, option),
1472 Ok(Some(Event::PaymentClaimed {
1475 purpose: _init_tlv_based_struct_field!(purpose, upgradable_required),
1477 htlcs: htlcs.unwrap_or(vec![]),
1478 sender_intended_total_msat,
1485 _init_and_read_len_prefixed_tlv_fields!(reader, {
1486 (0, payment_id, required),
1487 (2, payment_hash, required),
1488 (4, path, required_vec),
1489 (6, blinded_tail, option),
1491 Ok(Some(Event::ProbeSuccessful {
1492 payment_id: payment_id.0.unwrap(),
1493 payment_hash: payment_hash.0.unwrap(),
1494 path: Path { hops: path, blinded_tail },
1501 _init_and_read_len_prefixed_tlv_fields!(reader, {
1502 (0, payment_id, required),
1503 (2, payment_hash, required),
1504 (4, path, required_vec),
1505 (6, short_channel_id, option),
1506 (8, blinded_tail, option),
1508 Ok(Some(Event::ProbeFailed {
1509 payment_id: payment_id.0.unwrap(),
1510 payment_hash: payment_hash.0.unwrap(),
1511 path: Path { hops: path, blinded_tail },
1519 let mut prev_channel_id = ChannelId::new_zero();
1520 let mut failed_next_destination_opt = UpgradableRequired(None);
1521 read_tlv_fields!(reader, {
1522 (0, prev_channel_id, required),
1523 (2, failed_next_destination_opt, upgradable_required),
1525 Ok(Some(Event::HTLCHandlingFailed {
1527 failed_next_destination: _init_tlv_based_struct_field!(failed_next_destination_opt, upgradable_required),
1535 let mut channel_id = ChannelId::new_zero();
1536 let mut user_channel_id: u128 = 0;
1537 let mut counterparty_node_id = RequiredWrapper(None);
1538 let mut channel_type = RequiredWrapper(None);
1539 read_tlv_fields!(reader, {
1540 (0, channel_id, required),
1541 (2, user_channel_id, required),
1542 (4, counterparty_node_id, required),
1543 (6, channel_type, required),
1546 Ok(Some(Event::ChannelReady {
1549 counterparty_node_id: counterparty_node_id.0.unwrap(),
1550 channel_type: channel_type.0.unwrap()
1557 let mut channel_id = ChannelId::new_zero();
1558 let mut user_channel_id: u128 = 0;
1559 let mut former_temporary_channel_id = None;
1560 let mut counterparty_node_id = RequiredWrapper(None);
1561 let mut funding_txo = RequiredWrapper(None);
1562 read_tlv_fields!(reader, {
1563 (0, channel_id, required),
1564 (2, user_channel_id, required),
1565 (4, former_temporary_channel_id, required),
1566 (6, counterparty_node_id, required),
1567 (8, funding_txo, required),
1570 Ok(Some(Event::ChannelPending {
1573 former_temporary_channel_id,
1574 counterparty_node_id: counterparty_node_id.0.unwrap(),
1575 funding_txo: funding_txo.0.unwrap()
1582 _init_and_read_len_prefixed_tlv_fields!(reader, {
1583 (0, payment_id, required),
1585 Ok(Some(Event::InvoiceRequestFailed {
1586 payment_id: payment_id.0.unwrap(),
1591 // Versions prior to 0.0.100 did not ignore odd types, instead returning InvalidValue.
1592 // Version 0.0.100 failed to properly ignore odd types, possibly resulting in corrupt
1594 x if x % 2 == 1 => {
1595 // If the event is of unknown type, assume it was written with `write_tlv_fields`,
1596 // which prefixes the whole thing with a length BigSize. Because the event is
1597 // odd-type unknown, we should treat it as `Ok(None)` even if it has some TLV
1598 // fields that are even. Thus, we avoid using `read_tlv_fields` and simply read
1599 // exactly the number of bytes specified, ignoring them entirely.
1600 let tlv_len: BigSize = Readable::read(reader)?;
1601 FixedLengthReader::new(reader, tlv_len.0)
1602 .eat_remaining().map_err(|_| msgs::DecodeError::ShortRead)?;
1605 _ => Err(msgs::DecodeError::InvalidValue)
1610 /// An event generated by ChannelManager which indicates a message should be sent to a peer (or
1611 /// broadcast to most peers).
1612 /// These events are handled by PeerManager::process_events if you are using a PeerManager.
1613 #[derive(Clone, Debug)]
1614 #[cfg_attr(test, derive(PartialEq))]
1615 pub enum MessageSendEvent {
1616 /// Used to indicate that we've accepted a channel open and should send the accept_channel
1617 /// message provided to the given peer.
1619 /// The node_id of the node which should receive this message
1621 /// The message which should be sent.
1622 msg: msgs::AcceptChannel,
1624 /// Used to indicate that we've accepted a V2 channel open and should send the accept_channel2
1625 /// message provided to the given peer.
1626 SendAcceptChannelV2 {
1627 /// The node_id of the node which should receive this message
1629 /// The message which should be sent.
1630 msg: msgs::AcceptChannelV2,
1632 /// Used to indicate that we've initiated a channel open and should send the open_channel
1633 /// message provided to the given peer.
1635 /// The node_id of the node which should receive this message
1637 /// The message which should be sent.
1638 msg: msgs::OpenChannel,
1640 /// Used to indicate that we've initiated a V2 channel open and should send the open_channel2
1641 /// message provided to the given peer.
1643 /// The node_id of the node which should receive this message
1645 /// The message which should be sent.
1646 msg: msgs::OpenChannelV2,
1648 /// Used to indicate that a funding_created message should be sent to the peer with the given node_id.
1649 SendFundingCreated {
1650 /// The node_id of the node which should receive this message
1652 /// The message which should be sent.
1653 msg: msgs::FundingCreated,
1655 /// Used to indicate that a funding_signed message should be sent to the peer with the given node_id.
1657 /// The node_id of the node which should receive this message
1659 /// The message which should be sent.
1660 msg: msgs::FundingSigned,
1662 /// Used to indicate that a stfu message should be sent to the peer with the given node id.
1664 /// The node_id of the node which should receive this message
1666 /// The message which should be sent.
1669 /// Used to indicate that a splice message should be sent to the peer with the given node id.
1671 /// The node_id of the node which should receive this message
1673 /// The message which should be sent.
1676 /// Used to indicate that a splice_ack message should be sent to the peer with the given node id.
1678 /// The node_id of the node which should receive this message
1680 /// The message which should be sent.
1681 msg: msgs::SpliceAck,
1683 /// Used to indicate that a splice_locked message should be sent to the peer with the given node id.
1685 /// The node_id of the node which should receive this message
1687 /// The message which should be sent.
1688 msg: msgs::SpliceLocked,
1690 /// Used to indicate that a tx_add_input message should be sent to the peer with the given node_id.
1692 /// The node_id of the node which should receive this message
1694 /// The message which should be sent.
1695 msg: msgs::TxAddInput,
1697 /// Used to indicate that a tx_add_output message should be sent to the peer with the given node_id.
1699 /// The node_id of the node which should receive this message
1701 /// The message which should be sent.
1702 msg: msgs::TxAddOutput,
1704 /// Used to indicate that a tx_remove_input message should be sent to the peer with the given node_id.
1706 /// The node_id of the node which should receive this message
1708 /// The message which should be sent.
1709 msg: msgs::TxRemoveInput,
1711 /// Used to indicate that a tx_remove_output message should be sent to the peer with the given node_id.
1712 SendTxRemoveOutput {
1713 /// The node_id of the node which should receive this message
1715 /// The message which should be sent.
1716 msg: msgs::TxRemoveOutput,
1718 /// Used to indicate that a tx_complete message should be sent to the peer with the given node_id.
1720 /// The node_id of the node which should receive this message
1722 /// The message which should be sent.
1723 msg: msgs::TxComplete,
1725 /// Used to indicate that a tx_signatures message should be sent to the peer with the given node_id.
1727 /// The node_id of the node which should receive this message
1729 /// The message which should be sent.
1730 msg: msgs::TxSignatures,
1732 /// Used to indicate that a tx_init_rbf message should be sent to the peer with the given node_id.
1734 /// The node_id of the node which should receive this message
1736 /// The message which should be sent.
1737 msg: msgs::TxInitRbf,
1739 /// Used to indicate that a tx_ack_rbf message should be sent to the peer with the given node_id.
1741 /// The node_id of the node which should receive this message
1743 /// The message which should be sent.
1744 msg: msgs::TxAckRbf,
1746 /// Used to indicate that a tx_abort message should be sent to the peer with the given node_id.
1748 /// The node_id of the node which should receive this message
1750 /// The message which should be sent.
1753 /// Used to indicate that a channel_ready message should be sent to the peer with the given node_id.
1755 /// The node_id of the node which should receive these message(s)
1757 /// The channel_ready message which should be sent.
1758 msg: msgs::ChannelReady,
1760 /// Used to indicate that an announcement_signatures message should be sent to the peer with the given node_id.
1761 SendAnnouncementSignatures {
1762 /// The node_id of the node which should receive these message(s)
1764 /// The announcement_signatures message which should be sent.
1765 msg: msgs::AnnouncementSignatures,
1767 /// Used to indicate that a series of HTLC update messages, as well as a commitment_signed
1768 /// message should be sent to the peer with the given node_id.
1770 /// The node_id of the node which should receive these message(s)
1772 /// The update messages which should be sent. ALL messages in the struct should be sent!
1773 updates: msgs::CommitmentUpdate,
1775 /// Used to indicate that a revoke_and_ack message should be sent to the peer with the given node_id.
1777 /// The node_id of the node which should receive this message
1779 /// The message which should be sent.
1780 msg: msgs::RevokeAndACK,
1782 /// Used to indicate that a closing_signed message should be sent to the peer with the given node_id.
1784 /// The node_id of the node which should receive this message
1786 /// The message which should be sent.
1787 msg: msgs::ClosingSigned,
1789 /// Used to indicate that a shutdown message should be sent to the peer with the given node_id.
1791 /// The node_id of the node which should receive this message
1793 /// The message which should be sent.
1794 msg: msgs::Shutdown,
1796 /// Used to indicate that a channel_reestablish message should be sent to the peer with the given node_id.
1797 SendChannelReestablish {
1798 /// The node_id of the node which should receive this message
1800 /// The message which should be sent.
1801 msg: msgs::ChannelReestablish,
1803 /// Used to send a channel_announcement and channel_update to a specific peer, likely on
1804 /// initial connection to ensure our peers know about our channels.
1805 SendChannelAnnouncement {
1806 /// The node_id of the node which should receive this message
1808 /// The channel_announcement which should be sent.
1809 msg: msgs::ChannelAnnouncement,
1810 /// The followup channel_update which should be sent.
1811 update_msg: msgs::ChannelUpdate,
1813 /// Used to indicate that a channel_announcement and channel_update should be broadcast to all
1814 /// peers (except the peer with node_id either msg.contents.node_id_1 or msg.contents.node_id_2).
1816 /// Note that after doing so, you very likely (unless you did so very recently) want to
1817 /// broadcast a node_announcement (e.g. via [`PeerManager::broadcast_node_announcement`]). This
1818 /// ensures that any nodes which see our channel_announcement also have a relevant
1819 /// node_announcement, including relevant feature flags which may be important for routing
1820 /// through or to us.
1822 /// [`PeerManager::broadcast_node_announcement`]: crate::ln::peer_handler::PeerManager::broadcast_node_announcement
1823 BroadcastChannelAnnouncement {
1824 /// The channel_announcement which should be sent.
1825 msg: msgs::ChannelAnnouncement,
1826 /// The followup channel_update which should be sent.
1827 update_msg: Option<msgs::ChannelUpdate>,
1829 /// Used to indicate that a channel_update should be broadcast to all peers.
1830 BroadcastChannelUpdate {
1831 /// The channel_update which should be sent.
1832 msg: msgs::ChannelUpdate,
1834 /// Used to indicate that a node_announcement should be broadcast to all peers.
1835 BroadcastNodeAnnouncement {
1836 /// The node_announcement which should be sent.
1837 msg: msgs::NodeAnnouncement,
1839 /// Used to indicate that a channel_update should be sent to a single peer.
1840 /// In contrast to [`Self::BroadcastChannelUpdate`], this is used when the channel is a
1841 /// private channel and we shouldn't be informing all of our peers of channel parameters.
1843 /// The node_id of the node which should receive this message
1845 /// The channel_update which should be sent.
1846 msg: msgs::ChannelUpdate,
1848 /// Broadcast an error downstream to be handled
1850 /// The node_id of the node which should receive this message
1852 /// The action which should be taken.
1853 action: msgs::ErrorAction
1855 /// Query a peer for channels with funding transaction UTXOs in a block range.
1856 SendChannelRangeQuery {
1857 /// The node_id of this message recipient
1859 /// The query_channel_range which should be sent.
1860 msg: msgs::QueryChannelRange,
1862 /// Request routing gossip messages from a peer for a list of channels identified by
1863 /// their short_channel_ids.
1865 /// The node_id of this message recipient
1867 /// The query_short_channel_ids which should be sent.
1868 msg: msgs::QueryShortChannelIds,
1870 /// Sends a reply to a channel range query. This may be one of several SendReplyChannelRange events
1871 /// emitted during processing of the query.
1872 SendReplyChannelRange {
1873 /// The node_id of this message recipient
1875 /// The reply_channel_range which should be sent.
1876 msg: msgs::ReplyChannelRange,
1878 /// Sends a timestamp filter for inbound gossip. This should be sent on each new connection to
1879 /// enable receiving gossip messages from the peer.
1880 SendGossipTimestampFilter {
1881 /// The node_id of this message recipient
1883 /// The gossip_timestamp_filter which should be sent.
1884 msg: msgs::GossipTimestampFilter,
1888 /// A trait indicating an object may generate message send events
1889 pub trait MessageSendEventsProvider {
1890 /// Gets the list of pending events which were generated by previous actions, clearing the list
1892 fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent>;
1895 /// A trait indicating an object may generate events.
1897 /// Events are processed by passing an [`EventHandler`] to [`process_pending_events`].
1899 /// Implementations of this trait may also feature an async version of event handling, as shown with
1900 /// [`ChannelManager::process_pending_events_async`] and
1901 /// [`ChainMonitor::process_pending_events_async`].
1905 /// When using this trait, [`process_pending_events`] will call [`handle_event`] for each pending
1906 /// event since the last invocation.
1908 /// In order to ensure no [`Event`]s are lost, implementors of this trait will persist [`Event`]s
1909 /// and replay any unhandled events on startup. An [`Event`] is considered handled when
1910 /// [`process_pending_events`] returns, thus handlers MUST fully handle [`Event`]s and persist any
1911 /// relevant changes to disk *before* returning.
1913 /// Further, because an application may crash between an [`Event`] being handled and the
1914 /// implementor of this trait being re-serialized, [`Event`] handling must be idempotent - in
1915 /// effect, [`Event`]s may be replayed.
1917 /// Note, handlers may call back into the provider and thus deadlocking must be avoided. Be sure to
1918 /// consult the provider's documentation on the implication of processing events and how a handler
1919 /// may safely use the provider (e.g., see [`ChannelManager::process_pending_events`] and
1920 /// [`ChainMonitor::process_pending_events`]).
1922 /// (C-not implementable) As there is likely no reason for a user to implement this trait on their
1925 /// [`process_pending_events`]: Self::process_pending_events
1926 /// [`handle_event`]: EventHandler::handle_event
1927 /// [`ChannelManager::process_pending_events`]: crate::ln::channelmanager::ChannelManager#method.process_pending_events
1928 /// [`ChainMonitor::process_pending_events`]: crate::chain::chainmonitor::ChainMonitor#method.process_pending_events
1929 /// [`ChannelManager::process_pending_events_async`]: crate::ln::channelmanager::ChannelManager::process_pending_events_async
1930 /// [`ChainMonitor::process_pending_events_async`]: crate::chain::chainmonitor::ChainMonitor::process_pending_events_async
1931 pub trait EventsProvider {
1932 /// Processes any events generated since the last call using the given event handler.
1934 /// See the trait-level documentation for requirements.
1935 fn process_pending_events<H: Deref>(&self, handler: H) where H::Target: EventHandler;
1938 /// A trait implemented for objects handling events from [`EventsProvider`].
1940 /// An async variation also exists for implementations of [`EventsProvider`] that support async
1941 /// event handling. The async event handler should satisfy the generic bounds: `F:
1942 /// core::future::Future, H: Fn(Event) -> F`.
1943 pub trait EventHandler {
1944 /// Handles the given [`Event`].
1946 /// See [`EventsProvider`] for details that must be considered when implementing this method.
1947 fn handle_event(&self, event: Event);
1950 impl<F> EventHandler for F where F: Fn(Event) {
1951 fn handle_event(&self, event: Event) {
1956 impl<T: EventHandler> EventHandler for Arc<T> {
1957 fn handle_event(&self, event: Event) {
1958 self.deref().handle_event(event)