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::{PackedLockTime, Transaction, OutPoint};
34 use bitcoin::blockdata::script::Script;
35 use bitcoin::hashes::Hash;
36 use bitcoin::hashes::sha256::Hash as Sha256;
37 use bitcoin::secp256k1::PublicKey;
39 use crate::prelude::*;
40 use core::time::Duration;
44 /// Some information provided on receipt of payment depends on whether the payment received is a
45 /// spontaneous payment or a "conventional" lightning payment that's paying an invoice.
46 #[derive(Clone, Debug, PartialEq, Eq)]
47 pub enum PaymentPurpose {
48 /// Information for receiving a payment that we generated an invoice for.
50 /// The preimage to the payment_hash, if the payment hash (and secret) were fetched via
51 /// [`ChannelManager::create_inbound_payment`]. If provided, this can be handed directly to
52 /// [`ChannelManager::claim_funds`].
54 /// [`ChannelManager::create_inbound_payment`]: crate::ln::channelmanager::ChannelManager::create_inbound_payment
55 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
56 payment_preimage: Option<PaymentPreimage>,
57 /// The "payment secret". This authenticates the sender to the recipient, preventing a
58 /// number of deanonymization attacks during the routing process.
59 /// It is provided here for your reference, however its accuracy is enforced directly by
60 /// [`ChannelManager`] using the values you previously provided to
61 /// [`ChannelManager::create_inbound_payment`] or
62 /// [`ChannelManager::create_inbound_payment_for_hash`].
64 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
65 /// [`ChannelManager::create_inbound_payment`]: crate::ln::channelmanager::ChannelManager::create_inbound_payment
66 /// [`ChannelManager::create_inbound_payment_for_hash`]: crate::ln::channelmanager::ChannelManager::create_inbound_payment_for_hash
67 payment_secret: PaymentSecret,
69 /// Because this is a spontaneous payment, the payer generated their own preimage rather than us
70 /// (the payee) providing a preimage.
71 SpontaneousPayment(PaymentPreimage),
74 impl_writeable_tlv_based_enum!(PaymentPurpose,
75 (0, InvoicePayment) => {
76 (0, payment_preimage, option),
77 (2, payment_secret, required),
79 (2, SpontaneousPayment)
82 /// Information about an HTLC that is part of a payment that can be claimed.
83 #[derive(Clone, Debug, PartialEq, Eq)]
84 pub struct ClaimedHTLC {
85 /// The `channel_id` of the channel over which the HTLC was received.
86 pub channel_id: ChannelId,
87 /// The `user_channel_id` of the channel over which the HTLC was received. This is the value
88 /// passed in to [`ChannelManager::create_channel`] for outbound channels, or to
89 /// [`ChannelManager::accept_inbound_channel`] for inbound channels if
90 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
91 /// `user_channel_id` will be randomized for an inbound channel.
93 /// This field will be zero for a payment that was serialized prior to LDK version 0.0.117. (This
94 /// should only happen in the case that a payment was claimable prior to LDK version 0.0.117, but
95 /// was not actually claimed until after upgrading.)
97 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
98 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
99 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
100 pub user_channel_id: u128,
101 /// The block height at which this HTLC expires.
102 pub cltv_expiry: u32,
103 /// The amount (in msats) of this part of an MPP.
106 impl_writeable_tlv_based!(ClaimedHTLC, {
107 (0, channel_id, required),
108 (2, user_channel_id, required),
109 (4, cltv_expiry, required),
110 (6, value_msat, required),
113 /// When the payment path failure took place and extra details about it. [`PathFailure::OnPath`] may
114 /// contain a [`NetworkUpdate`] that needs to be applied to the [`NetworkGraph`].
116 /// [`NetworkUpdate`]: crate::routing::gossip::NetworkUpdate
117 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
118 #[derive(Clone, Debug, Eq, PartialEq)]
119 pub enum PathFailure {
120 /// We failed to initially send the payment and no HTLC was committed to. Contains the relevant
123 /// The error surfaced from initial send.
126 /// A hop on the path failed to forward our payment.
128 /// If present, this [`NetworkUpdate`] should be applied to the [`NetworkGraph`] so that routing
129 /// decisions can take into account the update.
131 /// [`NetworkUpdate`]: crate::routing::gossip::NetworkUpdate
132 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
133 network_update: Option<NetworkUpdate>,
137 impl_writeable_tlv_based_enum_upgradable!(PathFailure,
139 (0, network_update, upgradable_option),
141 (2, InitialSend) => {
142 (0, err, upgradable_required),
146 #[derive(Clone, Debug, PartialEq, Eq)]
147 /// The reason the channel was closed. See individual variants for more details.
148 pub enum ClosureReason {
149 /// Closure generated from receiving a peer error message.
151 /// Our counterparty may have broadcasted their latest commitment state, and we have
153 CounterpartyForceClosed {
154 /// The error which the peer sent us.
156 /// Be careful about printing the peer_msg, a well-crafted message could exploit
157 /// a security vulnerability in the terminal emulator or the logging subsystem.
158 /// To be safe, use `Display` on `UntrustedString`
160 /// [`UntrustedString`]: crate::util::string::UntrustedString
161 peer_msg: UntrustedString,
163 /// Closure generated from [`ChannelManager::force_close_channel`], called by the user.
165 /// [`ChannelManager::force_close_channel`]: crate::ln::channelmanager::ChannelManager::force_close_channel.
167 /// The channel was closed after negotiating a cooperative close and we've now broadcasted
168 /// the cooperative close transaction. Note the shutdown may have been initiated by us.
169 //TODO: split between CounterpartyInitiated/LocallyInitiated
171 /// A commitment transaction was confirmed on chain, closing the channel. Most likely this
172 /// commitment transaction came from our counterparty, but it may also have come from
173 /// a copy of our own `ChannelMonitor`.
174 CommitmentTxConfirmed,
175 /// The funding transaction failed to confirm in a timely manner on an inbound channel.
177 /// Closure generated from processing an event, likely a HTLC forward/relay/reception.
179 /// A developer-readable error message which we generated.
182 /// The peer disconnected prior to funding completing. In this case the spec mandates that we
183 /// forget the channel entirely - we can attempt again if the peer reconnects.
185 /// This includes cases where we restarted prior to funding completion, including prior to the
186 /// initial [`ChannelMonitor`] persistence completing.
188 /// In LDK versions prior to 0.0.107 this could also occur if we were unable to connect to the
189 /// peer because of mutual incompatibility between us and our channel counterparty.
191 /// [`ChannelMonitor`]: crate::chain::channelmonitor::ChannelMonitor
193 /// Closure generated from `ChannelManager::read` if the [`ChannelMonitor`] is newer than
194 /// the [`ChannelManager`] deserialized.
196 /// [`ChannelMonitor`]: crate::chain::channelmonitor::ChannelMonitor
197 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
198 OutdatedChannelManager,
199 /// The counterparty requested a cooperative close of a channel that had not been funded yet.
200 /// The channel has been immediately closed.
201 CounterpartyCoopClosedUnfundedChannel,
202 /// Another channel in the same funding batch closed before the funding transaction
203 /// was ready to be broadcast.
207 impl core::fmt::Display for ClosureReason {
208 fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
209 f.write_str("Channel closed because ")?;
211 ClosureReason::CounterpartyForceClosed { peer_msg } => {
212 f.write_fmt(format_args!("counterparty force-closed with message: {}", peer_msg))
214 ClosureReason::HolderForceClosed => f.write_str("user manually force-closed the channel"),
215 ClosureReason::CooperativeClosure => f.write_str("the channel was cooperatively closed"),
216 ClosureReason::CommitmentTxConfirmed => f.write_str("commitment or closing transaction was confirmed on chain."),
217 ClosureReason::FundingTimedOut => write!(f, "funding transaction failed to confirm within {} blocks", FUNDING_CONF_DEADLINE_BLOCKS),
218 ClosureReason::ProcessingError { err } => {
219 f.write_str("of an exception: ")?;
222 ClosureReason::DisconnectedPeer => f.write_str("the peer disconnected prior to the channel being funded"),
223 ClosureReason::OutdatedChannelManager => f.write_str("the ChannelManager read from disk was stale compared to ChannelMonitor(s)"),
224 ClosureReason::CounterpartyCoopClosedUnfundedChannel => f.write_str("the peer requested the unfunded channel be closed"),
225 ClosureReason::FundingBatchClosure => f.write_str("another channel in the same funding batch closed"),
230 impl_writeable_tlv_based_enum_upgradable!(ClosureReason,
231 (0, CounterpartyForceClosed) => { (1, peer_msg, required) },
232 (1, FundingTimedOut) => {},
233 (2, HolderForceClosed) => {},
234 (6, CommitmentTxConfirmed) => {},
235 (4, CooperativeClosure) => {},
236 (8, ProcessingError) => { (1, err, required) },
237 (10, DisconnectedPeer) => {},
238 (12, OutdatedChannelManager) => {},
239 (13, CounterpartyCoopClosedUnfundedChannel) => {},
240 (15, FundingBatchClosure) => {}
243 /// Intended destination of a failed HTLC as indicated in [`Event::HTLCHandlingFailed`].
244 #[derive(Clone, Debug, PartialEq, Eq)]
245 pub enum HTLCDestination {
246 /// We tried forwarding to a channel but failed to do so. An example of such an instance is when
247 /// there is insufficient capacity in our outbound channel.
249 /// The `node_id` of the next node. For backwards compatibility, this field is
250 /// marked as optional, versions prior to 0.0.110 may not always be able to provide
251 /// counterparty node information.
252 node_id: Option<PublicKey>,
253 /// The outgoing `channel_id` between us and the next node.
254 channel_id: ChannelId,
256 /// Scenario where we are unsure of the next node to forward the HTLC to.
258 /// Short channel id we are requesting to forward an HTLC to.
259 requested_forward_scid: u64,
261 /// We couldn't forward to the outgoing scid. An example would be attempting to send a duplicate
264 /// Short channel id we are requesting to forward an HTLC to.
265 requested_forward_scid: u64
267 /// Failure scenario where an HTLC may have been forwarded to be intended for us,
268 /// but is invalid for some reason, so we reject it.
270 /// Some of the reasons may include:
272 /// * Excess HTLCs for a payment that we have already fully received, over-paying for the
274 /// * The counterparty node modified the HTLC in transit,
275 /// * A probing attack where an intermediary node is trying to detect if we are the ultimate
276 /// recipient for a payment.
278 /// The payment hash of the payment we attempted to process.
279 payment_hash: PaymentHash
283 impl_writeable_tlv_based_enum_upgradable!(HTLCDestination,
284 (0, NextHopChannel) => {
285 (0, node_id, required),
286 (2, channel_id, required),
288 (1, InvalidForward) => {
289 (0, requested_forward_scid, required),
291 (2, UnknownNextHop) => {
292 (0, requested_forward_scid, required),
294 (4, FailedPayment) => {
295 (0, payment_hash, required),
299 /// Will be used in [`Event::HTLCIntercepted`] to identify the next hop in the HTLC's path.
300 /// Currently only used in serialization for the sake of maintaining compatibility. More variants
301 /// will be added for general-purpose HTLC forward intercepts as well as trampoline forward
302 /// intercepts in upcoming work.
303 enum InterceptNextHop {
305 requested_next_hop_scid: u64,
309 impl_writeable_tlv_based_enum!(InterceptNextHop,
311 (0, requested_next_hop_scid, required),
315 /// The reason the payment failed. Used in [`Event::PaymentFailed`].
316 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
317 pub enum PaymentFailureReason {
318 /// The intended recipient rejected our payment.
320 /// The user chose to abandon this payment by calling [`ChannelManager::abandon_payment`].
322 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
324 /// We exhausted all of our retry attempts while trying to send the payment, or we
325 /// exhausted the [`Retry::Timeout`] if the user set one. If at any point a retry
326 /// attempt failed while being forwarded along the path, an [`Event::PaymentPathFailed`] will
327 /// have come before this.
329 /// [`Retry::Timeout`]: crate::ln::channelmanager::Retry::Timeout
331 /// The payment expired while retrying, based on the provided
332 /// [`PaymentParameters::expiry_time`].
334 /// [`PaymentParameters::expiry_time`]: crate::routing::router::PaymentParameters::expiry_time
336 /// We failed to find a route while retrying the payment.
338 /// This error should generally never happen. This likely means that there is a problem with
343 impl_writeable_tlv_based_enum!(PaymentFailureReason,
344 (0, RecipientRejected) => {},
345 (2, UserAbandoned) => {},
346 (4, RetriesExhausted) => {},
347 (6, PaymentExpired) => {},
348 (8, RouteNotFound) => {},
349 (10, UnexpectedError) => {}, ;
352 /// An Event which you should probably take some action in response to.
354 /// Note that while Writeable and Readable are implemented for Event, you probably shouldn't use
355 /// them directly as they don't round-trip exactly (for example FundingGenerationReady is never
356 /// written as it makes no sense to respond to it after reconnecting to peers).
357 #[derive(Clone, Debug, PartialEq, Eq)]
359 /// Used to indicate that the client should generate a funding transaction with the given
360 /// parameters and then call [`ChannelManager::funding_transaction_generated`].
361 /// Generated in [`ChannelManager`] message handling.
362 /// Note that *all inputs* in the funding transaction must spend SegWit outputs or your
363 /// counterparty can steal your funds!
365 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
366 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
367 FundingGenerationReady {
368 /// The random channel_id we picked which you'll need to pass into
369 /// [`ChannelManager::funding_transaction_generated`].
371 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
372 temporary_channel_id: ChannelId,
373 /// The counterparty's node_id, which you'll need to pass back into
374 /// [`ChannelManager::funding_transaction_generated`].
376 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
377 counterparty_node_id: PublicKey,
378 /// The value, in satoshis, that the output should have.
379 channel_value_satoshis: u64,
380 /// The script which should be used in the transaction output.
381 output_script: Script,
382 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
383 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
384 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
385 /// `user_channel_id` will be randomized for an inbound channel. This may be zero for objects
386 /// serialized with LDK versions prior to 0.0.113.
388 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
389 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
390 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
391 user_channel_id: u128,
393 /// Indicates that we've been offered a payment and it needs to be claimed via calling
394 /// [`ChannelManager::claim_funds`] with the preimage given in [`PaymentPurpose`].
396 /// Note that if the preimage is not known, you should call
397 /// [`ChannelManager::fail_htlc_backwards`] or [`ChannelManager::fail_htlc_backwards_with_reason`]
398 /// to free up resources for this HTLC and avoid network congestion.
400 /// If [`Event::PaymentClaimable::onion_fields`] is `Some`, and includes custom TLVs with even type
401 /// numbers, you should use [`ChannelManager::fail_htlc_backwards_with_reason`] with
402 /// [`FailureCode::InvalidOnionPayload`] if you fail to understand and handle the contents, or
403 /// [`ChannelManager::claim_funds_with_known_custom_tlvs`] upon successful handling.
404 /// If you don't intend to check for custom TLVs, you can simply use
405 /// [`ChannelManager::claim_funds`], which will automatically fail back even custom TLVs.
407 /// If you fail to call [`ChannelManager::claim_funds`],
408 /// [`ChannelManager::claim_funds_with_known_custom_tlvs`],
409 /// [`ChannelManager::fail_htlc_backwards`], or
410 /// [`ChannelManager::fail_htlc_backwards_with_reason`] within the HTLC's timeout, the HTLC will
411 /// be automatically failed.
414 /// LDK will not stop an inbound payment from being paid multiple times, so multiple
415 /// `PaymentClaimable` events may be generated for the same payment. In such a case it is
416 /// polite (and required in the lightning specification) to fail the payment the second time
417 /// and give the sender their money back rather than accepting double payment.
420 /// This event used to be called `PaymentReceived` in LDK versions 0.0.112 and earlier.
422 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
423 /// [`ChannelManager::claim_funds_with_known_custom_tlvs`]: crate::ln::channelmanager::ChannelManager::claim_funds_with_known_custom_tlvs
424 /// [`FailureCode::InvalidOnionPayload`]: crate::ln::channelmanager::FailureCode::InvalidOnionPayload
425 /// [`ChannelManager::fail_htlc_backwards`]: crate::ln::channelmanager::ChannelManager::fail_htlc_backwards
426 /// [`ChannelManager::fail_htlc_backwards_with_reason`]: crate::ln::channelmanager::ChannelManager::fail_htlc_backwards_with_reason
428 /// The node that will receive the payment after it has been claimed.
429 /// This is useful to identify payments received via [phantom nodes].
430 /// This field will always be filled in when the event was generated by LDK versions
431 /// 0.0.113 and above.
433 /// [phantom nodes]: crate::sign::PhantomKeysManager
434 receiver_node_id: Option<PublicKey>,
435 /// The hash for which the preimage should be handed to the ChannelManager. Note that LDK will
436 /// not stop you from registering duplicate payment hashes for inbound payments.
437 payment_hash: PaymentHash,
438 /// The fields in the onion which were received with each HTLC. Only fields which were
439 /// identical in each HTLC involved in the payment will be included here.
441 /// Payments received on LDK versions prior to 0.0.115 will have this field unset.
442 onion_fields: Option<RecipientOnionFields>,
443 /// The value, in thousandths of a satoshi, that this payment is claimable for. May be greater
444 /// than the invoice amount.
446 /// May be less than the invoice amount if [`ChannelConfig::accept_underpaying_htlcs`] is set
447 /// and the previous hop took an extra fee.
450 /// If [`ChannelConfig::accept_underpaying_htlcs`] is set and you claim without verifying this
451 /// field, you may lose money!
453 /// [`ChannelConfig::accept_underpaying_htlcs`]: crate::util::config::ChannelConfig::accept_underpaying_htlcs
455 /// The value, in thousands of a satoshi, that was skimmed off of this payment as an extra fee
456 /// taken by our channel counterparty.
458 /// Will always be 0 unless [`ChannelConfig::accept_underpaying_htlcs`] is set.
460 /// [`ChannelConfig::accept_underpaying_htlcs`]: crate::util::config::ChannelConfig::accept_underpaying_htlcs
461 counterparty_skimmed_fee_msat: u64,
462 /// Information for claiming this received payment, based on whether the purpose of the
463 /// payment is to pay an invoice or to send a spontaneous payment.
464 purpose: PaymentPurpose,
465 /// The `channel_id` indicating over which channel we received the payment.
466 via_channel_id: Option<ChannelId>,
467 /// The `user_channel_id` indicating over which channel we received the payment.
468 via_user_channel_id: Option<u128>,
469 /// The block height at which this payment will be failed back and will no longer be
470 /// eligible for claiming.
472 /// Prior to this height, a call to [`ChannelManager::claim_funds`] is guaranteed to
473 /// succeed, however you should wait for [`Event::PaymentClaimed`] to be sure.
475 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
476 claim_deadline: Option<u32>,
478 /// Indicates a payment has been claimed and we've received money!
480 /// This most likely occurs when [`ChannelManager::claim_funds`] has been called in response
481 /// to an [`Event::PaymentClaimable`]. However, if we previously crashed during a
482 /// [`ChannelManager::claim_funds`] call you may see this event without a corresponding
483 /// [`Event::PaymentClaimable`] event.
486 /// LDK will not stop an inbound payment from being paid multiple times, so multiple
487 /// `PaymentClaimable` events may be generated for the same payment. If you then call
488 /// [`ChannelManager::claim_funds`] twice for the same [`Event::PaymentClaimable`] you may get
489 /// multiple `PaymentClaimed` events.
491 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
493 /// The node that received the payment.
494 /// This is useful to identify payments which were received via [phantom nodes].
495 /// This field will always be filled in when the event was generated by LDK versions
496 /// 0.0.113 and above.
498 /// [phantom nodes]: crate::sign::PhantomKeysManager
499 receiver_node_id: Option<PublicKey>,
500 /// The payment hash of the claimed payment. Note that LDK will not stop you from
501 /// registering duplicate payment hashes for inbound payments.
502 payment_hash: PaymentHash,
503 /// The value, in thousandths of a satoshi, that this payment is for. May be greater than the
506 /// The purpose of the claimed payment, i.e. whether the payment was for an invoice or a
507 /// spontaneous payment.
508 purpose: PaymentPurpose,
509 /// The HTLCs that comprise the claimed payment. This will be empty for events serialized prior
510 /// to LDK version 0.0.117.
511 htlcs: Vec<ClaimedHTLC>,
512 /// The sender-intended sum total of all the MPP parts. This will be `None` for events
513 /// serialized prior to LDK version 0.0.117.
514 sender_intended_total_msat: Option<u64>,
516 /// Indicates a request for an invoice failed to yield a response in a reasonable amount of time
517 /// or was explicitly abandoned by [`ChannelManager::abandon_payment`].
519 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
520 InvoiceRequestFailed {
521 /// The `payment_id` to have been associated with payment for the requested invoice.
522 payment_id: PaymentId,
524 /// Indicates an outbound payment we made succeeded (i.e. it made it all the way to its target
525 /// and we got back the payment preimage for it).
527 /// Note for MPP payments: in rare cases, this event may be preceded by a `PaymentPathFailed`
528 /// event. In this situation, you SHOULD treat this payment as having succeeded.
530 /// The `payment_id` passed to [`ChannelManager::send_payment`].
532 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
533 payment_id: Option<PaymentId>,
534 /// The preimage to the hash given to ChannelManager::send_payment.
535 /// Note that this serves as a payment receipt, if you wish to have such a thing, you must
536 /// store it somehow!
537 payment_preimage: PaymentPreimage,
538 /// The hash that was given to [`ChannelManager::send_payment`].
540 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
541 payment_hash: PaymentHash,
542 /// The total fee which was spent at intermediate hops in this payment, across all paths.
544 /// Note that, like [`Route::get_total_fees`] this does *not* include any potential
545 /// overpayment to the recipient node.
547 /// If the recipient or an intermediate node misbehaves and gives us free money, this may
548 /// overstate the amount paid, though this is unlikely.
550 /// [`Route::get_total_fees`]: crate::routing::router::Route::get_total_fees
551 fee_paid_msat: Option<u64>,
553 /// Indicates an outbound payment failed. Individual [`Event::PaymentPathFailed`] events
554 /// provide failure information for each path attempt in the payment, including retries.
556 /// This event is provided once there are no further pending HTLCs for the payment and the
557 /// payment is no longer retryable, due either to the [`Retry`] provided or
558 /// [`ChannelManager::abandon_payment`] having been called for the corresponding payment.
560 /// In exceedingly rare cases, it is possible that an [`Event::PaymentFailed`] is generated for
561 /// a payment after an [`Event::PaymentSent`] event for this same payment has already been
562 /// received and processed. In this case, the [`Event::PaymentFailed`] event MUST be ignored,
563 /// and the payment MUST be treated as having succeeded.
565 /// [`Retry`]: crate::ln::channelmanager::Retry
566 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
568 /// The `payment_id` passed to [`ChannelManager::send_payment`].
570 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
571 payment_id: PaymentId,
572 /// The hash that was given to [`ChannelManager::send_payment`].
574 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
575 payment_hash: PaymentHash,
576 /// The reason the payment failed. This is only `None` for events generated or serialized
577 /// by versions prior to 0.0.115.
578 reason: Option<PaymentFailureReason>,
580 /// Indicates that a path for an outbound payment was successful.
582 /// Always generated after [`Event::PaymentSent`] and thus useful for scoring channels. See
583 /// [`Event::PaymentSent`] for obtaining the payment preimage.
584 PaymentPathSuccessful {
585 /// The `payment_id` passed to [`ChannelManager::send_payment`].
587 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
588 payment_id: PaymentId,
589 /// The hash that was given to [`ChannelManager::send_payment`].
591 /// This will be `Some` for all payments which completed on LDK 0.0.104 or later.
593 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
594 payment_hash: Option<PaymentHash>,
595 /// The payment path that was successful.
597 /// May contain a closed channel if the HTLC sent along the path was fulfilled on chain.
600 /// Indicates an outbound HTLC we sent failed, likely due to an intermediary node being unable to
603 /// Note that this does *not* indicate that all paths for an MPP payment have failed, see
604 /// [`Event::PaymentFailed`].
606 /// See [`ChannelManager::abandon_payment`] for giving up on this payment before its retries have
609 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
611 /// The `payment_id` passed to [`ChannelManager::send_payment`].
613 /// This will be `Some` for all payment paths which failed on LDK 0.0.103 or later.
615 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
616 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
617 payment_id: Option<PaymentId>,
618 /// The hash that was given to [`ChannelManager::send_payment`].
620 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
621 payment_hash: PaymentHash,
622 /// Indicates the payment was rejected for some reason by the recipient. This implies that
623 /// the payment has failed, not just the route in question. If this is not set, the payment may
624 /// be retried via a different route.
625 payment_failed_permanently: bool,
626 /// Extra error details based on the failure type. May contain an update that needs to be
627 /// applied to the [`NetworkGraph`].
629 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
630 failure: PathFailure,
631 /// The payment path that failed.
633 /// The channel responsible for the failed payment path.
635 /// Note that for route hints or for the first hop in a path this may be an SCID alias and
636 /// may not refer to a channel in the public network graph. These aliases may also collide
637 /// with channels in the public network graph.
639 /// If this is `Some`, then the corresponding channel should be avoided when the payment is
640 /// retried. May be `None` for older [`Event`] serializations.
641 short_channel_id: Option<u64>,
643 error_code: Option<u16>,
645 error_data: Option<Vec<u8>>,
647 /// Indicates that a probe payment we sent returned successful, i.e., only failed at the destination.
649 /// The id returned by [`ChannelManager::send_probe`].
651 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
652 payment_id: PaymentId,
653 /// The hash generated by [`ChannelManager::send_probe`].
655 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
656 payment_hash: PaymentHash,
657 /// The payment path that was successful.
660 /// Indicates that a probe payment we sent failed at an intermediary node on the path.
662 /// The id returned by [`ChannelManager::send_probe`].
664 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
665 payment_id: PaymentId,
666 /// The hash generated by [`ChannelManager::send_probe`].
668 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
669 payment_hash: PaymentHash,
670 /// The payment path that failed.
672 /// The channel responsible for the failed probe.
674 /// Note that for route hints or for the first hop in a path this may be an SCID alias and
675 /// may not refer to a channel in the public network graph. These aliases may also collide
676 /// with channels in the public network graph.
677 short_channel_id: Option<u64>,
679 /// Used to indicate that [`ChannelManager::process_pending_htlc_forwards`] should be called at
680 /// a time in the future.
682 /// [`ChannelManager::process_pending_htlc_forwards`]: crate::ln::channelmanager::ChannelManager::process_pending_htlc_forwards
683 PendingHTLCsForwardable {
684 /// The minimum amount of time that should be waited prior to calling
685 /// process_pending_htlc_forwards. To increase the effort required to correlate payments,
686 /// you should wait a random amount of time in roughly the range (now + time_forwardable,
687 /// now + 5*time_forwardable).
688 time_forwardable: Duration,
690 /// Used to indicate that we've intercepted an HTLC forward. This event will only be generated if
691 /// you've encoded an intercept scid in the receiver's invoice route hints using
692 /// [`ChannelManager::get_intercept_scid`] and have set [`UserConfig::accept_intercept_htlcs`].
694 /// [`ChannelManager::forward_intercepted_htlc`] or
695 /// [`ChannelManager::fail_intercepted_htlc`] MUST be called in response to this event. See
696 /// their docs for more information.
698 /// [`ChannelManager::get_intercept_scid`]: crate::ln::channelmanager::ChannelManager::get_intercept_scid
699 /// [`UserConfig::accept_intercept_htlcs`]: crate::util::config::UserConfig::accept_intercept_htlcs
700 /// [`ChannelManager::forward_intercepted_htlc`]: crate::ln::channelmanager::ChannelManager::forward_intercepted_htlc
701 /// [`ChannelManager::fail_intercepted_htlc`]: crate::ln::channelmanager::ChannelManager::fail_intercepted_htlc
703 /// An id to help LDK identify which HTLC is being forwarded or failed.
704 intercept_id: InterceptId,
705 /// The fake scid that was programmed as the next hop's scid, generated using
706 /// [`ChannelManager::get_intercept_scid`].
708 /// [`ChannelManager::get_intercept_scid`]: crate::ln::channelmanager::ChannelManager::get_intercept_scid
709 requested_next_hop_scid: u64,
710 /// The payment hash used for this HTLC.
711 payment_hash: PaymentHash,
712 /// How many msats were received on the inbound edge of this HTLC.
713 inbound_amount_msat: u64,
714 /// How many msats the payer intended to route to the next node. Depending on the reason you are
715 /// intercepting this payment, you might take a fee by forwarding less than this amount.
716 /// Forwarding less than this amount may break compatibility with LDK versions prior to 0.0.116.
718 /// Note that LDK will NOT check that expected fees were factored into this value. You MUST
719 /// check that whatever fee you want has been included here or subtract it as required. Further,
720 /// LDK will not stop you from forwarding more than you received.
721 expected_outbound_amount_msat: u64,
723 /// Used to indicate that an output which you should know how to spend was confirmed on chain
724 /// and is now spendable.
725 /// Such an output will *not* ever be spent by rust-lightning, and are not at risk of your
726 /// counterparty spending them due to some kind of timeout. Thus, you need to store them
727 /// somewhere and spend them when you create on-chain transactions.
729 /// The outputs which you should store as spendable by you.
730 outputs: Vec<SpendableOutputDescriptor>,
731 /// The `channel_id` indicating which channel the spendable outputs belong to.
733 /// This will always be `Some` for events generated by LDK versions 0.0.117 and above.
734 channel_id: Option<ChannelId>,
736 /// This event is generated when a payment has been successfully forwarded through us and a
737 /// forwarding fee earned.
739 /// The incoming channel between the previous node and us. This is only `None` for events
740 /// generated or serialized by versions prior to 0.0.107.
741 prev_channel_id: Option<ChannelId>,
742 /// The outgoing channel between the next node and us. This is only `None` for events
743 /// generated or serialized by versions prior to 0.0.107.
744 next_channel_id: Option<ChannelId>,
745 /// The fee, in milli-satoshis, which was earned as a result of the payment.
747 /// Note that if we force-closed the channel over which we forwarded an HTLC while the HTLC
748 /// was pending, the amount the next hop claimed will have been rounded down to the nearest
749 /// whole satoshi. Thus, the fee calculated here may be higher than expected as we still
750 /// claimed the full value in millisatoshis from the source. In this case,
751 /// `claim_from_onchain_tx` will be set.
753 /// If the channel which sent us the payment has been force-closed, we will claim the funds
754 /// via an on-chain transaction. In that case we do not yet know the on-chain transaction
755 /// fees which we will spend and will instead set this to `None`. It is possible duplicate
756 /// `PaymentForwarded` events are generated for the same payment iff `fee_earned_msat` is
758 fee_earned_msat: Option<u64>,
759 /// If this is `true`, the forwarded HTLC was claimed by our counterparty via an on-chain
761 claim_from_onchain_tx: bool,
762 /// The final amount forwarded, in milli-satoshis, after the fee is deducted.
764 /// The caveat described above the `fee_earned_msat` field applies here as well.
765 outbound_amount_forwarded_msat: Option<u64>,
767 /// Used to indicate that a channel with the given `channel_id` is being opened and pending
768 /// confirmation on-chain.
770 /// This event is emitted when the funding transaction has been signed and is broadcast to the
771 /// network. For 0conf channels it will be immediately followed by the corresponding
772 /// [`Event::ChannelReady`] event.
774 /// The `channel_id` of the channel that is pending confirmation.
775 channel_id: ChannelId,
776 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
777 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
778 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
779 /// `user_channel_id` will be randomized for an inbound channel.
781 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
782 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
783 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
784 user_channel_id: u128,
785 /// The `temporary_channel_id` this channel used to be known by during channel establishment.
787 /// Will be `None` for channels created prior to LDK version 0.0.115.
788 former_temporary_channel_id: Option<ChannelId>,
789 /// The `node_id` of the channel counterparty.
790 counterparty_node_id: PublicKey,
791 /// The outpoint of the channel's funding transaction.
792 funding_txo: OutPoint,
794 /// Used to indicate that a channel with the given `channel_id` is ready to
795 /// be used. This event is emitted either when the funding transaction has been confirmed
796 /// on-chain, or, in case of a 0conf channel, when both parties have confirmed the channel
799 /// The `channel_id` of the channel that is ready.
800 channel_id: ChannelId,
801 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
802 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
803 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
804 /// `user_channel_id` will be randomized for an inbound channel.
806 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
807 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
808 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
809 user_channel_id: u128,
810 /// The `node_id` of the channel counterparty.
811 counterparty_node_id: PublicKey,
812 /// The features that this channel will operate with.
813 channel_type: ChannelTypeFeatures,
815 /// Used to indicate that a previously opened channel with the given `channel_id` is in the
816 /// process of closure.
818 /// Note that this event is only triggered for accepted channels: if the
819 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true and the channel is
820 /// rejected, no `ChannelClosed` event will be sent.
822 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
823 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
825 /// The `channel_id` of the channel which has been closed. Note that on-chain transactions
826 /// resolving the channel are likely still awaiting confirmation.
827 channel_id: ChannelId,
828 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
829 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
830 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
831 /// `user_channel_id` will be randomized for inbound channels.
832 /// This may be zero for inbound channels serialized prior to 0.0.113 and will always be
833 /// zero for objects serialized with LDK versions prior to 0.0.102.
835 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
836 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
837 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
838 user_channel_id: u128,
839 /// The reason the channel was closed.
840 reason: ClosureReason,
841 /// Counterparty in the closed channel.
843 /// This field will be `None` for objects serialized prior to LDK 0.0.117.
844 counterparty_node_id: Option<PublicKey>,
845 /// Channel capacity of the closing channel (sats).
847 /// This field will be `None` for objects serialized prior to LDK 0.0.117.
848 channel_capacity_sats: Option<u64>,
850 /// Used to indicate to the user that they can abandon the funding transaction and recycle the
851 /// inputs for another purpose.
853 /// This event is not guaranteed to be generated for channels that are closed due to a restart.
855 /// The channel_id of the channel which has been closed.
856 channel_id: ChannelId,
857 /// The full transaction received from the user
858 transaction: Transaction
860 /// Indicates a request to open a new channel by a peer.
862 /// To accept the request, call [`ChannelManager::accept_inbound_channel`]. To reject the request,
863 /// call [`ChannelManager::force_close_without_broadcasting_txn`]. Note that a ['ChannelClosed`]
864 /// event will _not_ be triggered if the channel is rejected.
866 /// The event is only triggered when a new open channel request is received and the
867 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true.
869 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
870 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
871 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
873 /// The temporary channel ID of the channel requested to be opened.
875 /// When responding to the request, the `temporary_channel_id` should be passed
876 /// back to the ChannelManager through [`ChannelManager::accept_inbound_channel`] to accept,
877 /// or through [`ChannelManager::force_close_without_broadcasting_txn`] to reject.
879 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
880 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
881 temporary_channel_id: ChannelId,
882 /// The node_id of the counterparty requesting to open the channel.
884 /// When responding to the request, the `counterparty_node_id` should be passed
885 /// back to the `ChannelManager` through [`ChannelManager::accept_inbound_channel`] to
886 /// accept the request, or through [`ChannelManager::force_close_without_broadcasting_txn`] to reject the
889 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
890 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
891 counterparty_node_id: PublicKey,
892 /// The channel value of the requested channel.
893 funding_satoshis: u64,
894 /// Our starting balance in the channel if the request is accepted, in milli-satoshi.
896 /// The features that this channel will operate with. If you reject the channel, a
897 /// well-behaved counterparty may automatically re-attempt the channel with a new set of
900 /// Note that if [`ChannelTypeFeatures::supports_scid_privacy`] returns true on this type,
901 /// the resulting [`ChannelManager`] will not be readable by versions of LDK prior to
904 /// Furthermore, note that if [`ChannelTypeFeatures::supports_zero_conf`] returns true on this type,
905 /// the resulting [`ChannelManager`] will not be readable by versions of LDK prior to
906 /// 0.0.107. Channels setting this type also need to get manually accepted via
907 /// [`crate::ln::channelmanager::ChannelManager::accept_inbound_channel_from_trusted_peer_0conf`],
908 /// or will be rejected otherwise.
910 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
911 channel_type: ChannelTypeFeatures,
913 /// Indicates that the HTLC was accepted, but could not be processed when or after attempting to
916 /// Some scenarios where this event may be sent include:
917 /// * Insufficient capacity in the outbound channel
918 /// * While waiting to forward the HTLC, the channel it is meant to be forwarded through closes
919 /// * When an unknown SCID is requested for forwarding a payment.
920 /// * Expected MPP amount has already been reached
921 /// * The HTLC has timed out
923 /// This event, however, does not get generated if an HTLC fails to meet the forwarding
924 /// requirements (i.e. insufficient fees paid, or a CLTV that is too soon).
926 /// The channel over which the HTLC was received.
927 prev_channel_id: ChannelId,
928 /// Destination of the HTLC that failed to be processed.
929 failed_next_destination: HTLCDestination,
931 /// Indicates that a transaction originating from LDK needs to have its fee bumped. This event
932 /// requires confirmed external funds to be readily available to spend.
934 /// LDK does not currently generate this event unless the
935 /// [`ChannelHandshakeConfig::negotiate_anchors_zero_fee_htlc_tx`] config flag is set to true.
936 /// It is limited to the scope of channels with anchor outputs.
938 /// [`ChannelHandshakeConfig::negotiate_anchors_zero_fee_htlc_tx`]: crate::util::config::ChannelHandshakeConfig::negotiate_anchors_zero_fee_htlc_tx
939 BumpTransaction(BumpTransactionEvent),
942 impl Writeable for Event {
943 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
945 &Event::FundingGenerationReady { .. } => {
947 // We never write out FundingGenerationReady events as, upon disconnection, peers
948 // drop any channels which have not yet exchanged funding_signed.
950 &Event::PaymentClaimable { ref payment_hash, ref amount_msat, counterparty_skimmed_fee_msat,
951 ref purpose, ref receiver_node_id, ref via_channel_id, ref via_user_channel_id,
952 ref claim_deadline, ref onion_fields
955 let mut payment_secret = None;
956 let payment_preimage;
958 PaymentPurpose::InvoicePayment { payment_preimage: preimage, payment_secret: secret } => {
959 payment_secret = Some(secret);
960 payment_preimage = *preimage;
962 PaymentPurpose::SpontaneousPayment(preimage) => {
963 payment_preimage = Some(*preimage);
966 let skimmed_fee_opt = if counterparty_skimmed_fee_msat == 0 { None }
967 else { Some(counterparty_skimmed_fee_msat) };
968 write_tlv_fields!(writer, {
969 (0, payment_hash, required),
970 (1, receiver_node_id, option),
971 (2, payment_secret, option),
972 (3, via_channel_id, option),
973 (4, amount_msat, required),
974 (5, via_user_channel_id, option),
975 // Type 6 was `user_payment_id` on 0.0.103 and earlier
976 (7, claim_deadline, option),
977 (8, payment_preimage, option),
978 (9, onion_fields, option),
979 (10, skimmed_fee_opt, option),
982 &Event::PaymentSent { ref payment_id, ref payment_preimage, ref payment_hash, ref fee_paid_msat } => {
984 write_tlv_fields!(writer, {
985 (0, payment_preimage, required),
986 (1, payment_hash, required),
987 (3, payment_id, option),
988 (5, fee_paid_msat, option),
991 &Event::PaymentPathFailed {
992 ref payment_id, ref payment_hash, ref payment_failed_permanently, ref failure,
993 ref path, ref short_channel_id,
1001 error_code.write(writer)?;
1003 error_data.write(writer)?;
1004 write_tlv_fields!(writer, {
1005 (0, payment_hash, required),
1006 (1, None::<NetworkUpdate>, option), // network_update in LDK versions prior to 0.0.114
1007 (2, payment_failed_permanently, required),
1008 (3, false, required), // all_paths_failed in LDK versions prior to 0.0.114
1009 (4, path.blinded_tail, option),
1010 (5, path.hops, required_vec),
1011 (7, short_channel_id, option),
1012 (9, None::<RouteParameters>, option), // retry in LDK versions prior to 0.0.115
1013 (11, payment_id, option),
1014 (13, failure, required),
1017 &Event::PendingHTLCsForwardable { time_forwardable: _ } => {
1019 // Note that we now ignore these on the read end as we'll re-generate them in
1020 // ChannelManager, we write them here only for backwards compatibility.
1022 &Event::SpendableOutputs { ref outputs, channel_id } => {
1024 write_tlv_fields!(writer, {
1025 (0, WithoutLength(outputs), required),
1026 (1, channel_id, option),
1029 &Event::HTLCIntercepted { requested_next_hop_scid, payment_hash, inbound_amount_msat, expected_outbound_amount_msat, intercept_id } => {
1031 let intercept_scid = InterceptNextHop::FakeScid { requested_next_hop_scid };
1032 write_tlv_fields!(writer, {
1033 (0, intercept_id, required),
1034 (2, intercept_scid, required),
1035 (4, payment_hash, required),
1036 (6, inbound_amount_msat, required),
1037 (8, expected_outbound_amount_msat, required),
1040 &Event::PaymentForwarded {
1041 fee_earned_msat, prev_channel_id, claim_from_onchain_tx,
1042 next_channel_id, outbound_amount_forwarded_msat
1045 write_tlv_fields!(writer, {
1046 (0, fee_earned_msat, option),
1047 (1, prev_channel_id, option),
1048 (2, claim_from_onchain_tx, required),
1049 (3, next_channel_id, option),
1050 (5, outbound_amount_forwarded_msat, option),
1053 &Event::ChannelClosed { ref channel_id, ref user_channel_id, ref reason,
1054 ref counterparty_node_id, ref channel_capacity_sats
1057 // `user_channel_id` used to be a single u64 value. In order to remain backwards
1058 // compatible with versions prior to 0.0.113, the u128 is serialized as two
1059 // separate u64 values.
1060 let user_channel_id_low = *user_channel_id as u64;
1061 let user_channel_id_high = (*user_channel_id >> 64) as u64;
1062 write_tlv_fields!(writer, {
1063 (0, channel_id, required),
1064 (1, user_channel_id_low, required),
1065 (2, reason, required),
1066 (3, user_channel_id_high, required),
1067 (5, counterparty_node_id, option),
1068 (7, channel_capacity_sats, option),
1071 &Event::DiscardFunding { ref channel_id, ref transaction } => {
1072 11u8.write(writer)?;
1073 write_tlv_fields!(writer, {
1074 (0, channel_id, required),
1075 (2, transaction, required)
1078 &Event::PaymentPathSuccessful { ref payment_id, ref payment_hash, ref path } => {
1079 13u8.write(writer)?;
1080 write_tlv_fields!(writer, {
1081 (0, payment_id, required),
1082 (2, payment_hash, option),
1083 (4, path.hops, required_vec),
1084 (6, path.blinded_tail, option),
1087 &Event::PaymentFailed { ref payment_id, ref payment_hash, ref reason } => {
1088 15u8.write(writer)?;
1089 write_tlv_fields!(writer, {
1090 (0, payment_id, required),
1091 (1, reason, option),
1092 (2, payment_hash, required),
1095 &Event::OpenChannelRequest { .. } => {
1096 17u8.write(writer)?;
1097 // We never write the OpenChannelRequest events as, upon disconnection, peers
1098 // drop any channels which have not yet exchanged funding_signed.
1100 &Event::PaymentClaimed { ref payment_hash, ref amount_msat, ref purpose, ref receiver_node_id, ref htlcs, ref sender_intended_total_msat } => {
1101 19u8.write(writer)?;
1102 write_tlv_fields!(writer, {
1103 (0, payment_hash, required),
1104 (1, receiver_node_id, option),
1105 (2, purpose, required),
1106 (4, amount_msat, required),
1107 (5, *htlcs, optional_vec),
1108 (7, sender_intended_total_msat, option),
1111 &Event::ProbeSuccessful { ref payment_id, ref payment_hash, ref path } => {
1112 21u8.write(writer)?;
1113 write_tlv_fields!(writer, {
1114 (0, payment_id, required),
1115 (2, payment_hash, required),
1116 (4, path.hops, required_vec),
1117 (6, path.blinded_tail, option),
1120 &Event::ProbeFailed { ref payment_id, ref payment_hash, ref path, ref short_channel_id } => {
1121 23u8.write(writer)?;
1122 write_tlv_fields!(writer, {
1123 (0, payment_id, required),
1124 (2, payment_hash, required),
1125 (4, path.hops, required_vec),
1126 (6, short_channel_id, option),
1127 (8, path.blinded_tail, option),
1130 &Event::HTLCHandlingFailed { ref prev_channel_id, ref failed_next_destination } => {
1131 25u8.write(writer)?;
1132 write_tlv_fields!(writer, {
1133 (0, prev_channel_id, required),
1134 (2, failed_next_destination, required),
1137 &Event::BumpTransaction(ref event)=> {
1138 27u8.write(writer)?;
1140 // We never write the ChannelClose|HTLCResolution events as they'll be replayed
1141 // upon restarting anyway if they remain unresolved.
1142 BumpTransactionEvent::ChannelClose { .. } => {}
1143 BumpTransactionEvent::HTLCResolution { .. } => {}
1145 write_tlv_fields!(writer, {}); // Write a length field for forwards compat
1147 &Event::ChannelReady { ref channel_id, ref user_channel_id, ref counterparty_node_id, ref channel_type } => {
1148 29u8.write(writer)?;
1149 write_tlv_fields!(writer, {
1150 (0, channel_id, required),
1151 (2, user_channel_id, required),
1152 (4, counterparty_node_id, required),
1153 (6, channel_type, required),
1156 &Event::ChannelPending { ref channel_id, ref user_channel_id, ref former_temporary_channel_id, ref counterparty_node_id, ref funding_txo } => {
1157 31u8.write(writer)?;
1158 write_tlv_fields!(writer, {
1159 (0, channel_id, required),
1160 (2, user_channel_id, required),
1161 (4, former_temporary_channel_id, required),
1162 (6, counterparty_node_id, required),
1163 (8, funding_txo, required),
1166 &Event::InvoiceRequestFailed { ref payment_id } => {
1167 33u8.write(writer)?;
1168 write_tlv_fields!(writer, {
1169 (0, payment_id, required),
1172 // Note that, going forward, all new events must only write data inside of
1173 // `write_tlv_fields`. Versions 0.0.101+ will ignore odd-numbered events that write
1174 // data via `write_tlv_fields`.
1179 impl MaybeReadable for Event {
1180 fn read<R: io::Read>(reader: &mut R) -> Result<Option<Self>, msgs::DecodeError> {
1181 match Readable::read(reader)? {
1182 // Note that we do not write a length-prefixed TLV for FundingGenerationReady events,
1183 // unlike all other events, thus we return immediately here.
1187 let mut payment_hash = PaymentHash([0; 32]);
1188 let mut payment_preimage = None;
1189 let mut payment_secret = None;
1190 let mut amount_msat = 0;
1191 let mut counterparty_skimmed_fee_msat_opt = None;
1192 let mut receiver_node_id = None;
1193 let mut _user_payment_id = None::<u64>; // Used in 0.0.103 and earlier, no longer written in 0.0.116+.
1194 let mut via_channel_id = None;
1195 let mut claim_deadline = None;
1196 let mut via_user_channel_id = None;
1197 let mut onion_fields = None;
1198 read_tlv_fields!(reader, {
1199 (0, payment_hash, required),
1200 (1, receiver_node_id, option),
1201 (2, payment_secret, option),
1202 (3, via_channel_id, option),
1203 (4, amount_msat, required),
1204 (5, via_user_channel_id, option),
1205 (6, _user_payment_id, option),
1206 (7, claim_deadline, option),
1207 (8, payment_preimage, option),
1208 (9, onion_fields, option),
1209 (10, counterparty_skimmed_fee_msat_opt, option),
1211 let purpose = match payment_secret {
1212 Some(secret) => PaymentPurpose::InvoicePayment {
1214 payment_secret: secret
1216 None if payment_preimage.is_some() => PaymentPurpose::SpontaneousPayment(payment_preimage.unwrap()),
1217 None => return Err(msgs::DecodeError::InvalidValue),
1219 Ok(Some(Event::PaymentClaimable {
1223 counterparty_skimmed_fee_msat: counterparty_skimmed_fee_msat_opt.unwrap_or(0),
1226 via_user_channel_id,
1235 let mut payment_preimage = PaymentPreimage([0; 32]);
1236 let mut payment_hash = None;
1237 let mut payment_id = None;
1238 let mut fee_paid_msat = None;
1239 read_tlv_fields!(reader, {
1240 (0, payment_preimage, required),
1241 (1, payment_hash, option),
1242 (3, payment_id, option),
1243 (5, fee_paid_msat, option),
1245 if payment_hash.is_none() {
1246 payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0[..]).into_inner()));
1248 Ok(Some(Event::PaymentSent {
1251 payment_hash: payment_hash.unwrap(),
1260 let error_code = Readable::read(reader)?;
1262 let error_data = Readable::read(reader)?;
1263 let mut payment_hash = PaymentHash([0; 32]);
1264 let mut payment_failed_permanently = false;
1265 let mut network_update = None;
1266 let mut blinded_tail: Option<BlindedTail> = None;
1267 let mut path: Option<Vec<RouteHop>> = Some(vec![]);
1268 let mut short_channel_id = None;
1269 let mut payment_id = None;
1270 let mut failure_opt = None;
1271 read_tlv_fields!(reader, {
1272 (0, payment_hash, required),
1273 (1, network_update, upgradable_option),
1274 (2, payment_failed_permanently, required),
1275 (4, blinded_tail, option),
1276 // Added as a part of LDK 0.0.101 and always filled in since.
1277 // Defaults to an empty Vec, though likely should have been `Option`al.
1278 (5, path, optional_vec),
1279 (7, short_channel_id, option),
1280 (11, payment_id, option),
1281 (13, failure_opt, upgradable_option),
1283 let failure = failure_opt.unwrap_or_else(|| PathFailure::OnPath { network_update });
1284 Ok(Some(Event::PaymentPathFailed {
1287 payment_failed_permanently,
1289 path: Path { hops: path.unwrap(), blinded_tail },
1302 let mut outputs = WithoutLength(Vec::new());
1303 let mut channel_id: Option<ChannelId> = None;
1304 read_tlv_fields!(reader, {
1305 (0, outputs, required),
1306 (1, channel_id, option),
1308 Ok(Some(Event::SpendableOutputs { outputs: outputs.0, channel_id }))
1313 let mut payment_hash = PaymentHash([0; 32]);
1314 let mut intercept_id = InterceptId([0; 32]);
1315 let mut requested_next_hop_scid = InterceptNextHop::FakeScid { requested_next_hop_scid: 0 };
1316 let mut inbound_amount_msat = 0;
1317 let mut expected_outbound_amount_msat = 0;
1318 read_tlv_fields!(reader, {
1319 (0, intercept_id, required),
1320 (2, requested_next_hop_scid, required),
1321 (4, payment_hash, required),
1322 (6, inbound_amount_msat, required),
1323 (8, expected_outbound_amount_msat, required),
1325 let next_scid = match requested_next_hop_scid {
1326 InterceptNextHop::FakeScid { requested_next_hop_scid: scid } => scid
1328 Ok(Some(Event::HTLCIntercepted {
1330 requested_next_hop_scid: next_scid,
1331 inbound_amount_msat,
1332 expected_outbound_amount_msat,
1338 let mut fee_earned_msat = None;
1339 let mut prev_channel_id = None;
1340 let mut claim_from_onchain_tx = false;
1341 let mut next_channel_id = None;
1342 let mut outbound_amount_forwarded_msat = None;
1343 read_tlv_fields!(reader, {
1344 (0, fee_earned_msat, option),
1345 (1, prev_channel_id, option),
1346 (2, claim_from_onchain_tx, required),
1347 (3, next_channel_id, option),
1348 (5, outbound_amount_forwarded_msat, option),
1350 Ok(Some(Event::PaymentForwarded {
1351 fee_earned_msat, prev_channel_id, claim_from_onchain_tx, next_channel_id,
1352 outbound_amount_forwarded_msat
1359 let mut channel_id = ChannelId::new_zero();
1360 let mut reason = UpgradableRequired(None);
1361 let mut user_channel_id_low_opt: Option<u64> = None;
1362 let mut user_channel_id_high_opt: Option<u64> = None;
1363 let mut counterparty_node_id = None;
1364 let mut channel_capacity_sats = None;
1365 read_tlv_fields!(reader, {
1366 (0, channel_id, required),
1367 (1, user_channel_id_low_opt, option),
1368 (2, reason, upgradable_required),
1369 (3, user_channel_id_high_opt, option),
1370 (5, counterparty_node_id, option),
1371 (7, channel_capacity_sats, option),
1374 // `user_channel_id` used to be a single u64 value. In order to remain
1375 // backwards compatible with versions prior to 0.0.113, the u128 is serialized
1376 // as two separate u64 values.
1377 let user_channel_id = (user_channel_id_low_opt.unwrap_or(0) as u128) +
1378 ((user_channel_id_high_opt.unwrap_or(0) as u128) << 64);
1380 Ok(Some(Event::ChannelClosed { channel_id, user_channel_id, reason: _init_tlv_based_struct_field!(reason, upgradable_required),
1381 counterparty_node_id, channel_capacity_sats }))
1387 let mut channel_id = ChannelId::new_zero();
1388 let mut transaction = Transaction{ version: 2, lock_time: PackedLockTime::ZERO, input: Vec::new(), output: Vec::new() };
1389 read_tlv_fields!(reader, {
1390 (0, channel_id, required),
1391 (2, transaction, required),
1393 Ok(Some(Event::DiscardFunding { channel_id, transaction } ))
1399 _init_and_read_len_prefixed_tlv_fields!(reader, {
1400 (0, payment_id, required),
1401 (2, payment_hash, option),
1402 (4, path, required_vec),
1403 (6, blinded_tail, option),
1405 Ok(Some(Event::PaymentPathSuccessful {
1406 payment_id: payment_id.0.unwrap(),
1408 path: Path { hops: path, blinded_tail },
1415 let mut payment_hash = PaymentHash([0; 32]);
1416 let mut payment_id = PaymentId([0; 32]);
1417 let mut reason = None;
1418 read_tlv_fields!(reader, {
1419 (0, payment_id, required),
1420 (1, reason, upgradable_option),
1421 (2, payment_hash, required),
1423 Ok(Some(Event::PaymentFailed {
1432 // Value 17 is used for `Event::OpenChannelRequest`.
1437 let mut payment_hash = PaymentHash([0; 32]);
1438 let mut purpose = UpgradableRequired(None);
1439 let mut amount_msat = 0;
1440 let mut receiver_node_id = None;
1441 let mut htlcs: Option<Vec<ClaimedHTLC>> = Some(vec![]);
1442 let mut sender_intended_total_msat: Option<u64> = None;
1443 read_tlv_fields!(reader, {
1444 (0, payment_hash, required),
1445 (1, receiver_node_id, option),
1446 (2, purpose, upgradable_required),
1447 (4, amount_msat, required),
1448 (5, htlcs, optional_vec),
1449 (7, sender_intended_total_msat, option),
1451 Ok(Some(Event::PaymentClaimed {
1454 purpose: _init_tlv_based_struct_field!(purpose, upgradable_required),
1456 htlcs: htlcs.unwrap_or(vec![]),
1457 sender_intended_total_msat,
1464 _init_and_read_len_prefixed_tlv_fields!(reader, {
1465 (0, payment_id, required),
1466 (2, payment_hash, required),
1467 (4, path, required_vec),
1468 (6, blinded_tail, option),
1470 Ok(Some(Event::ProbeSuccessful {
1471 payment_id: payment_id.0.unwrap(),
1472 payment_hash: payment_hash.0.unwrap(),
1473 path: Path { hops: path, blinded_tail },
1480 _init_and_read_len_prefixed_tlv_fields!(reader, {
1481 (0, payment_id, required),
1482 (2, payment_hash, required),
1483 (4, path, required_vec),
1484 (6, short_channel_id, option),
1485 (8, blinded_tail, option),
1487 Ok(Some(Event::ProbeFailed {
1488 payment_id: payment_id.0.unwrap(),
1489 payment_hash: payment_hash.0.unwrap(),
1490 path: Path { hops: path, blinded_tail },
1498 let mut prev_channel_id = ChannelId::new_zero();
1499 let mut failed_next_destination_opt = UpgradableRequired(None);
1500 read_tlv_fields!(reader, {
1501 (0, prev_channel_id, required),
1502 (2, failed_next_destination_opt, upgradable_required),
1504 Ok(Some(Event::HTLCHandlingFailed {
1506 failed_next_destination: _init_tlv_based_struct_field!(failed_next_destination_opt, upgradable_required),
1514 let mut channel_id = ChannelId::new_zero();
1515 let mut user_channel_id: u128 = 0;
1516 let mut counterparty_node_id = RequiredWrapper(None);
1517 let mut channel_type = RequiredWrapper(None);
1518 read_tlv_fields!(reader, {
1519 (0, channel_id, required),
1520 (2, user_channel_id, required),
1521 (4, counterparty_node_id, required),
1522 (6, channel_type, required),
1525 Ok(Some(Event::ChannelReady {
1528 counterparty_node_id: counterparty_node_id.0.unwrap(),
1529 channel_type: channel_type.0.unwrap()
1536 let mut channel_id = ChannelId::new_zero();
1537 let mut user_channel_id: u128 = 0;
1538 let mut former_temporary_channel_id = None;
1539 let mut counterparty_node_id = RequiredWrapper(None);
1540 let mut funding_txo = RequiredWrapper(None);
1541 read_tlv_fields!(reader, {
1542 (0, channel_id, required),
1543 (2, user_channel_id, required),
1544 (4, former_temporary_channel_id, required),
1545 (6, counterparty_node_id, required),
1546 (8, funding_txo, required),
1549 Ok(Some(Event::ChannelPending {
1552 former_temporary_channel_id,
1553 counterparty_node_id: counterparty_node_id.0.unwrap(),
1554 funding_txo: funding_txo.0.unwrap()
1561 _init_and_read_len_prefixed_tlv_fields!(reader, {
1562 (0, payment_id, required),
1564 Ok(Some(Event::InvoiceRequestFailed {
1565 payment_id: payment_id.0.unwrap(),
1570 // Versions prior to 0.0.100 did not ignore odd types, instead returning InvalidValue.
1571 // Version 0.0.100 failed to properly ignore odd types, possibly resulting in corrupt
1573 x if x % 2 == 1 => {
1574 // If the event is of unknown type, assume it was written with `write_tlv_fields`,
1575 // which prefixes the whole thing with a length BigSize. Because the event is
1576 // odd-type unknown, we should treat it as `Ok(None)` even if it has some TLV
1577 // fields that are even. Thus, we avoid using `read_tlv_fields` and simply read
1578 // exactly the number of bytes specified, ignoring them entirely.
1579 let tlv_len: BigSize = Readable::read(reader)?;
1580 FixedLengthReader::new(reader, tlv_len.0)
1581 .eat_remaining().map_err(|_| msgs::DecodeError::ShortRead)?;
1584 _ => Err(msgs::DecodeError::InvalidValue)
1589 /// An event generated by ChannelManager which indicates a message should be sent to a peer (or
1590 /// broadcast to most peers).
1591 /// These events are handled by PeerManager::process_events if you are using a PeerManager.
1592 #[derive(Clone, Debug)]
1593 #[cfg_attr(test, derive(PartialEq))]
1594 pub enum MessageSendEvent {
1595 /// Used to indicate that we've accepted a channel open and should send the accept_channel
1596 /// message provided to the given peer.
1598 /// The node_id of the node which should receive this message
1600 /// The message which should be sent.
1601 msg: msgs::AcceptChannel,
1603 /// Used to indicate that we've accepted a V2 channel open and should send the accept_channel2
1604 /// message provided to the given peer.
1605 SendAcceptChannelV2 {
1606 /// The node_id of the node which should receive this message
1608 /// The message which should be sent.
1609 msg: msgs::AcceptChannelV2,
1611 /// Used to indicate that we've initiated a channel open and should send the open_channel
1612 /// message provided to the given peer.
1614 /// The node_id of the node which should receive this message
1616 /// The message which should be sent.
1617 msg: msgs::OpenChannel,
1619 /// Used to indicate that we've initiated a V2 channel open and should send the open_channel2
1620 /// message provided to the given peer.
1622 /// The node_id of the node which should receive this message
1624 /// The message which should be sent.
1625 msg: msgs::OpenChannelV2,
1627 /// Used to indicate that a funding_created message should be sent to the peer with the given node_id.
1628 SendFundingCreated {
1629 /// The node_id of the node which should receive this message
1631 /// The message which should be sent.
1632 msg: msgs::FundingCreated,
1634 /// Used to indicate that a funding_signed message should be sent to the peer with the given node_id.
1636 /// The node_id of the node which should receive this message
1638 /// The message which should be sent.
1639 msg: msgs::FundingSigned,
1641 /// Used to indicate that a tx_add_input message should be sent to the peer with the given node_id.
1643 /// The node_id of the node which should receive this message
1645 /// The message which should be sent.
1646 msg: msgs::TxAddInput,
1648 /// Used to indicate that a tx_add_output message should be sent to the peer with the given node_id.
1650 /// The node_id of the node which should receive this message
1652 /// The message which should be sent.
1653 msg: msgs::TxAddOutput,
1655 /// Used to indicate that a tx_remove_input 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::TxRemoveInput,
1662 /// Used to indicate that a tx_remove_output message should be sent to the peer with the given node_id.
1663 SendTxRemoveOutput {
1664 /// The node_id of the node which should receive this message
1666 /// The message which should be sent.
1667 msg: msgs::TxRemoveOutput,
1669 /// Used to indicate that a tx_complete 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.
1674 msg: msgs::TxComplete,
1676 /// Used to indicate that a tx_signatures 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::TxSignatures,
1683 /// Used to indicate that a tx_init_rbf 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::TxInitRbf,
1690 /// Used to indicate that a tx_ack_rbf 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::TxAckRbf,
1697 /// Used to indicate that a tx_abort 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.
1704 /// Used to indicate that a channel_ready message should be sent to the peer with the given node_id.
1706 /// The node_id of the node which should receive these message(s)
1708 /// The channel_ready message which should be sent.
1709 msg: msgs::ChannelReady,
1711 /// Used to indicate that an announcement_signatures message should be sent to the peer with the given node_id.
1712 SendAnnouncementSignatures {
1713 /// The node_id of the node which should receive these message(s)
1715 /// The announcement_signatures message which should be sent.
1716 msg: msgs::AnnouncementSignatures,
1718 /// Used to indicate that a series of HTLC update messages, as well as a commitment_signed
1719 /// message should be sent to the peer with the given node_id.
1721 /// The node_id of the node which should receive these message(s)
1723 /// The update messages which should be sent. ALL messages in the struct should be sent!
1724 updates: msgs::CommitmentUpdate,
1726 /// Used to indicate that a revoke_and_ack message should be sent to the peer with the given node_id.
1728 /// The node_id of the node which should receive this message
1730 /// The message which should be sent.
1731 msg: msgs::RevokeAndACK,
1733 /// Used to indicate that a closing_signed message should be sent to the peer with the given node_id.
1735 /// The node_id of the node which should receive this message
1737 /// The message which should be sent.
1738 msg: msgs::ClosingSigned,
1740 /// Used to indicate that a shutdown message should be sent to the peer with the given node_id.
1742 /// The node_id of the node which should receive this message
1744 /// The message which should be sent.
1745 msg: msgs::Shutdown,
1747 /// Used to indicate that a channel_reestablish message should be sent to the peer with the given node_id.
1748 SendChannelReestablish {
1749 /// The node_id of the node which should receive this message
1751 /// The message which should be sent.
1752 msg: msgs::ChannelReestablish,
1754 /// Used to send a channel_announcement and channel_update to a specific peer, likely on
1755 /// initial connection to ensure our peers know about our channels.
1756 SendChannelAnnouncement {
1757 /// The node_id of the node which should receive this message
1759 /// The channel_announcement which should be sent.
1760 msg: msgs::ChannelAnnouncement,
1761 /// The followup channel_update which should be sent.
1762 update_msg: msgs::ChannelUpdate,
1764 /// Used to indicate that a channel_announcement and channel_update should be broadcast to all
1765 /// peers (except the peer with node_id either msg.contents.node_id_1 or msg.contents.node_id_2).
1767 /// Note that after doing so, you very likely (unless you did so very recently) want to
1768 /// broadcast a node_announcement (e.g. via [`PeerManager::broadcast_node_announcement`]). This
1769 /// ensures that any nodes which see our channel_announcement also have a relevant
1770 /// node_announcement, including relevant feature flags which may be important for routing
1771 /// through or to us.
1773 /// [`PeerManager::broadcast_node_announcement`]: crate::ln::peer_handler::PeerManager::broadcast_node_announcement
1774 BroadcastChannelAnnouncement {
1775 /// The channel_announcement which should be sent.
1776 msg: msgs::ChannelAnnouncement,
1777 /// The followup channel_update which should be sent.
1778 update_msg: Option<msgs::ChannelUpdate>,
1780 /// Used to indicate that a channel_update should be broadcast to all peers.
1781 BroadcastChannelUpdate {
1782 /// The channel_update which should be sent.
1783 msg: msgs::ChannelUpdate,
1785 /// Used to indicate that a node_announcement should be broadcast to all peers.
1786 BroadcastNodeAnnouncement {
1787 /// The node_announcement which should be sent.
1788 msg: msgs::NodeAnnouncement,
1790 /// Used to indicate that a channel_update should be sent to a single peer.
1791 /// In contrast to [`Self::BroadcastChannelUpdate`], this is used when the channel is a
1792 /// private channel and we shouldn't be informing all of our peers of channel parameters.
1794 /// The node_id of the node which should receive this message
1796 /// The channel_update which should be sent.
1797 msg: msgs::ChannelUpdate,
1799 /// Broadcast an error downstream to be handled
1801 /// The node_id of the node which should receive this message
1803 /// The action which should be taken.
1804 action: msgs::ErrorAction
1806 /// Query a peer for channels with funding transaction UTXOs in a block range.
1807 SendChannelRangeQuery {
1808 /// The node_id of this message recipient
1810 /// The query_channel_range which should be sent.
1811 msg: msgs::QueryChannelRange,
1813 /// Request routing gossip messages from a peer for a list of channels identified by
1814 /// their short_channel_ids.
1816 /// The node_id of this message recipient
1818 /// The query_short_channel_ids which should be sent.
1819 msg: msgs::QueryShortChannelIds,
1821 /// Sends a reply to a channel range query. This may be one of several SendReplyChannelRange events
1822 /// emitted during processing of the query.
1823 SendReplyChannelRange {
1824 /// The node_id of this message recipient
1826 /// The reply_channel_range which should be sent.
1827 msg: msgs::ReplyChannelRange,
1829 /// Sends a timestamp filter for inbound gossip. This should be sent on each new connection to
1830 /// enable receiving gossip messages from the peer.
1831 SendGossipTimestampFilter {
1832 /// The node_id of this message recipient
1834 /// The gossip_timestamp_filter which should be sent.
1835 msg: msgs::GossipTimestampFilter,
1839 /// A trait indicating an object may generate message send events
1840 pub trait MessageSendEventsProvider {
1841 /// Gets the list of pending events which were generated by previous actions, clearing the list
1843 fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent>;
1846 /// A trait indicating an object may generate onion messages to send
1847 pub trait OnionMessageProvider {
1848 /// Gets the next pending onion message for the peer with the given node id.
1849 fn next_onion_message_for_peer(&self, peer_node_id: PublicKey) -> Option<msgs::OnionMessage>;
1852 /// A trait indicating an object may generate events.
1854 /// Events are processed by passing an [`EventHandler`] to [`process_pending_events`].
1856 /// Implementations of this trait may also feature an async version of event handling, as shown with
1857 /// [`ChannelManager::process_pending_events_async`] and
1858 /// [`ChainMonitor::process_pending_events_async`].
1862 /// When using this trait, [`process_pending_events`] will call [`handle_event`] for each pending
1863 /// event since the last invocation.
1865 /// In order to ensure no [`Event`]s are lost, implementors of this trait will persist [`Event`]s
1866 /// and replay any unhandled events on startup. An [`Event`] is considered handled when
1867 /// [`process_pending_events`] returns, thus handlers MUST fully handle [`Event`]s and persist any
1868 /// relevant changes to disk *before* returning.
1870 /// Further, because an application may crash between an [`Event`] being handled and the
1871 /// implementor of this trait being re-serialized, [`Event`] handling must be idempotent - in
1872 /// effect, [`Event`]s may be replayed.
1874 /// Note, handlers may call back into the provider and thus deadlocking must be avoided. Be sure to
1875 /// consult the provider's documentation on the implication of processing events and how a handler
1876 /// may safely use the provider (e.g., see [`ChannelManager::process_pending_events`] and
1877 /// [`ChainMonitor::process_pending_events`]).
1879 /// (C-not implementable) As there is likely no reason for a user to implement this trait on their
1882 /// [`process_pending_events`]: Self::process_pending_events
1883 /// [`handle_event`]: EventHandler::handle_event
1884 /// [`ChannelManager::process_pending_events`]: crate::ln::channelmanager::ChannelManager#method.process_pending_events
1885 /// [`ChainMonitor::process_pending_events`]: crate::chain::chainmonitor::ChainMonitor#method.process_pending_events
1886 /// [`ChannelManager::process_pending_events_async`]: crate::ln::channelmanager::ChannelManager::process_pending_events_async
1887 /// [`ChainMonitor::process_pending_events_async`]: crate::chain::chainmonitor::ChainMonitor::process_pending_events_async
1888 pub trait EventsProvider {
1889 /// Processes any events generated since the last call using the given event handler.
1891 /// See the trait-level documentation for requirements.
1892 fn process_pending_events<H: Deref>(&self, handler: H) where H::Target: EventHandler;
1895 /// A trait implemented for objects handling events from [`EventsProvider`].
1897 /// An async variation also exists for implementations of [`EventsProvider`] that support async
1898 /// event handling. The async event handler should satisfy the generic bounds: `F:
1899 /// core::future::Future, H: Fn(Event) -> F`.
1900 pub trait EventHandler {
1901 /// Handles the given [`Event`].
1903 /// See [`EventsProvider`] for details that must be considered when implementing this method.
1904 fn handle_event(&self, event: Event);
1907 impl<F> EventHandler for F where F: Fn(Event) {
1908 fn handle_event(&self, event: Event) {
1913 impl<T: EventHandler> EventHandler for Arc<T> {
1914 fn handle_event(&self, event: Event) {
1915 self.deref().handle_event(event)