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::chain::transaction;
28 use crate::routing::gossip::NetworkUpdate;
29 use crate::util::errors::APIError;
30 use crate::util::ser::{BigSize, FixedLengthReader, Writeable, Writer, MaybeReadable, Readable, RequiredWrapper, UpgradableRequired, WithoutLength};
31 use crate::util::string::UntrustedString;
32 use crate::routing::router::{BlindedTail, Path, RouteHop, RouteParameters};
34 use bitcoin::{Transaction, OutPoint};
35 use bitcoin::blockdata::locktime::absolute::LockTime;
36 use bitcoin::blockdata::script::ScriptBuf;
37 use bitcoin::hashes::Hash;
38 use bitcoin::hashes::sha256::Hash as Sha256;
39 use bitcoin::secp256k1::PublicKey;
41 use core::time::Duration;
45 #[allow(unused_imports)]
46 use crate::prelude::*;
48 /// Some information provided on receipt of payment depends on whether the payment received is a
49 /// spontaneous payment or a "conventional" lightning payment that's paying an invoice.
50 #[derive(Clone, Debug, PartialEq, Eq)]
51 pub enum PaymentPurpose {
52 /// Information for receiving a payment that we generated an invoice for.
54 /// The preimage to the payment_hash, if the payment hash (and secret) were fetched via
55 /// [`ChannelManager::create_inbound_payment`]. If provided, this can be handed directly to
56 /// [`ChannelManager::claim_funds`].
58 /// [`ChannelManager::create_inbound_payment`]: crate::ln::channelmanager::ChannelManager::create_inbound_payment
59 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
60 payment_preimage: Option<PaymentPreimage>,
61 /// The "payment secret". This authenticates the sender to the recipient, preventing a
62 /// number of deanonymization attacks during the routing process.
63 /// It is provided here for your reference, however its accuracy is enforced directly by
64 /// [`ChannelManager`] using the values you previously provided to
65 /// [`ChannelManager::create_inbound_payment`] or
66 /// [`ChannelManager::create_inbound_payment_for_hash`].
68 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
69 /// [`ChannelManager::create_inbound_payment`]: crate::ln::channelmanager::ChannelManager::create_inbound_payment
70 /// [`ChannelManager::create_inbound_payment_for_hash`]: crate::ln::channelmanager::ChannelManager::create_inbound_payment_for_hash
71 payment_secret: PaymentSecret,
73 /// Because this is a spontaneous payment, the payer generated their own preimage rather than us
74 /// (the payee) providing a preimage.
75 SpontaneousPayment(PaymentPreimage),
79 /// Returns the preimage for this payment, if it is known.
80 pub fn preimage(&self) -> Option<PaymentPreimage> {
82 PaymentPurpose::InvoicePayment { payment_preimage, .. } => *payment_preimage,
83 PaymentPurpose::SpontaneousPayment(preimage) => Some(*preimage),
88 impl_writeable_tlv_based_enum!(PaymentPurpose,
89 (0, InvoicePayment) => {
90 (0, payment_preimage, option),
91 (2, payment_secret, required),
93 (2, SpontaneousPayment)
96 /// Information about an HTLC that is part of a payment that can be claimed.
97 #[derive(Clone, Debug, PartialEq, Eq)]
98 pub struct ClaimedHTLC {
99 /// The `channel_id` of the channel over which the HTLC was received.
100 pub channel_id: ChannelId,
101 /// The `user_channel_id` of the channel over which the HTLC was received. This is the value
102 /// passed in to [`ChannelManager::create_channel`] for outbound channels, or to
103 /// [`ChannelManager::accept_inbound_channel`] for inbound channels if
104 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
105 /// `user_channel_id` will be randomized for an inbound channel.
107 /// This field will be zero for a payment that was serialized prior to LDK version 0.0.117. (This
108 /// should only happen in the case that a payment was claimable prior to LDK version 0.0.117, but
109 /// was not actually claimed until after upgrading.)
111 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
112 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
113 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
114 pub user_channel_id: u128,
115 /// The block height at which this HTLC expires.
116 pub cltv_expiry: u32,
117 /// The amount (in msats) of this part of an MPP.
119 /// The extra fee our counterparty skimmed off the top of this HTLC, if any.
121 /// This value will always be 0 for [`ClaimedHTLC`]s serialized with LDK versions prior to
123 pub counterparty_skimmed_fee_msat: u64,
125 impl_writeable_tlv_based!(ClaimedHTLC, {
126 (0, channel_id, required),
127 (1, counterparty_skimmed_fee_msat, (default_value, 0u64)),
128 (2, user_channel_id, required),
129 (4, cltv_expiry, required),
130 (6, value_msat, required),
133 /// When the payment path failure took place and extra details about it. [`PathFailure::OnPath`] may
134 /// contain a [`NetworkUpdate`] that needs to be applied to the [`NetworkGraph`].
136 /// [`NetworkUpdate`]: crate::routing::gossip::NetworkUpdate
137 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
138 #[derive(Clone, Debug, Eq, PartialEq)]
139 pub enum PathFailure {
140 /// We failed to initially send the payment and no HTLC was committed to. Contains the relevant
143 /// The error surfaced from initial send.
146 /// A hop on the path failed to forward our payment.
148 /// If present, this [`NetworkUpdate`] should be applied to the [`NetworkGraph`] so that routing
149 /// decisions can take into account the update.
151 /// [`NetworkUpdate`]: crate::routing::gossip::NetworkUpdate
152 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
153 network_update: Option<NetworkUpdate>,
157 impl_writeable_tlv_based_enum_upgradable!(PathFailure,
159 (0, network_update, upgradable_option),
161 (2, InitialSend) => {
162 (0, err, upgradable_required),
166 #[derive(Clone, Debug, PartialEq, Eq)]
167 /// The reason the channel was closed. See individual variants for more details.
168 pub enum ClosureReason {
169 /// Closure generated from receiving a peer error message.
171 /// Our counterparty may have broadcasted their latest commitment state, and we have
173 CounterpartyForceClosed {
174 /// The error which the peer sent us.
176 /// Be careful about printing the peer_msg, a well-crafted message could exploit
177 /// a security vulnerability in the terminal emulator or the logging subsystem.
178 /// To be safe, use `Display` on `UntrustedString`
180 /// [`UntrustedString`]: crate::util::string::UntrustedString
181 peer_msg: UntrustedString,
183 /// Closure generated from [`ChannelManager::force_close_channel`], called by the user.
185 /// [`ChannelManager::force_close_channel`]: crate::ln::channelmanager::ChannelManager::force_close_channel.
187 /// The channel was closed after negotiating a cooperative close and we've now broadcasted
188 /// the cooperative close transaction. Note the shutdown may have been initiated by us.
190 /// This was only set in versions of LDK prior to 0.0.122.
191 // Can be removed once we disallow downgrading to 0.0.121
192 LegacyCooperativeClosure,
193 /// The channel was closed after negotiating a cooperative close and we've now broadcasted
194 /// the cooperative close transaction. This indicates that the shutdown was initiated by our
197 /// In rare cases where we initiated closure immediately prior to shutting down without
198 /// persisting, this value may be provided for channels we initiated closure for.
199 CounterpartyInitiatedCooperativeClosure,
200 /// The channel was closed after negotiating a cooperative close and we've now broadcasted
201 /// the cooperative close transaction. This indicates that the shutdown was initiated by us.
202 LocallyInitiatedCooperativeClosure,
203 /// A commitment transaction was confirmed on chain, closing the channel. Most likely this
204 /// commitment transaction came from our counterparty, but it may also have come from
205 /// a copy of our own `ChannelMonitor`.
206 CommitmentTxConfirmed,
207 /// The funding transaction failed to confirm in a timely manner on an inbound channel.
209 /// Closure generated from processing an event, likely a HTLC forward/relay/reception.
211 /// A developer-readable error message which we generated.
214 /// The peer disconnected prior to funding completing. In this case the spec mandates that we
215 /// forget the channel entirely - we can attempt again if the peer reconnects.
217 /// This includes cases where we restarted prior to funding completion, including prior to the
218 /// initial [`ChannelMonitor`] persistence completing.
220 /// In LDK versions prior to 0.0.107 this could also occur if we were unable to connect to the
221 /// peer because of mutual incompatibility between us and our channel counterparty.
223 /// [`ChannelMonitor`]: crate::chain::channelmonitor::ChannelMonitor
225 /// Closure generated from `ChannelManager::read` if the [`ChannelMonitor`] is newer than
226 /// the [`ChannelManager`] deserialized.
228 /// [`ChannelMonitor`]: crate::chain::channelmonitor::ChannelMonitor
229 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
230 OutdatedChannelManager,
231 /// The counterparty requested a cooperative close of a channel that had not been funded yet.
232 /// The channel has been immediately closed.
233 CounterpartyCoopClosedUnfundedChannel,
234 /// Another channel in the same funding batch closed before the funding transaction
235 /// was ready to be broadcast.
237 /// One of our HTLCs timed out in a channel, causing us to force close the channel.
241 impl core::fmt::Display for ClosureReason {
242 fn fmt(&self, f: &mut core::fmt::Formatter) -> Result<(), core::fmt::Error> {
243 f.write_str("Channel closed because ")?;
245 ClosureReason::CounterpartyForceClosed { peer_msg } => {
246 f.write_fmt(format_args!("counterparty force-closed with message: {}", peer_msg))
248 ClosureReason::HolderForceClosed => f.write_str("user force-closed the channel"),
249 ClosureReason::LegacyCooperativeClosure => f.write_str("the channel was cooperatively closed"),
250 ClosureReason::CounterpartyInitiatedCooperativeClosure => f.write_str("the channel was cooperatively closed by our peer"),
251 ClosureReason::LocallyInitiatedCooperativeClosure => f.write_str("the channel was cooperatively closed by us"),
252 ClosureReason::CommitmentTxConfirmed => f.write_str("commitment or closing transaction was confirmed on chain."),
253 ClosureReason::FundingTimedOut => write!(f, "funding transaction failed to confirm within {} blocks", FUNDING_CONF_DEADLINE_BLOCKS),
254 ClosureReason::ProcessingError { err } => {
255 f.write_str("of an exception: ")?;
258 ClosureReason::DisconnectedPeer => f.write_str("the peer disconnected prior to the channel being funded"),
259 ClosureReason::OutdatedChannelManager => f.write_str("the ChannelManager read from disk was stale compared to ChannelMonitor(s)"),
260 ClosureReason::CounterpartyCoopClosedUnfundedChannel => f.write_str("the peer requested the unfunded channel be closed"),
261 ClosureReason::FundingBatchClosure => f.write_str("another channel in the same funding batch closed"),
262 ClosureReason::HTLCsTimedOut => f.write_str("htlcs on the channel timed out"),
267 impl_writeable_tlv_based_enum_upgradable!(ClosureReason,
268 (0, CounterpartyForceClosed) => { (1, peer_msg, required) },
269 (1, FundingTimedOut) => {},
270 (2, HolderForceClosed) => {},
271 (6, CommitmentTxConfirmed) => {},
272 (4, LegacyCooperativeClosure) => {},
273 (8, ProcessingError) => { (1, err, required) },
274 (10, DisconnectedPeer) => {},
275 (12, OutdatedChannelManager) => {},
276 (13, CounterpartyCoopClosedUnfundedChannel) => {},
277 (15, FundingBatchClosure) => {},
278 (17, CounterpartyInitiatedCooperativeClosure) => {},
279 (19, LocallyInitiatedCooperativeClosure) => {},
280 (21, HTLCsTimedOut) => {},
283 /// Intended destination of a failed HTLC as indicated in [`Event::HTLCHandlingFailed`].
284 #[derive(Clone, Debug, PartialEq, Eq)]
285 pub enum HTLCDestination {
286 /// We tried forwarding to a channel but failed to do so. An example of such an instance is when
287 /// there is insufficient capacity in our outbound channel.
289 /// The `node_id` of the next node. For backwards compatibility, this field is
290 /// marked as optional, versions prior to 0.0.110 may not always be able to provide
291 /// counterparty node information.
292 node_id: Option<PublicKey>,
293 /// The outgoing `channel_id` between us and the next node.
294 channel_id: ChannelId,
296 /// Scenario where we are unsure of the next node to forward the HTLC to.
298 /// Short channel id we are requesting to forward an HTLC to.
299 requested_forward_scid: u64,
301 /// We couldn't forward to the outgoing scid. An example would be attempting to send a duplicate
304 /// Short channel id we are requesting to forward an HTLC to.
305 requested_forward_scid: u64
307 /// We couldn't decode the incoming onion to obtain the forwarding details.
309 /// Failure scenario where an HTLC may have been forwarded to be intended for us,
310 /// but is invalid for some reason, so we reject it.
312 /// Some of the reasons may include:
314 /// * Excess HTLCs for a payment that we have already fully received, over-paying for the
316 /// * The counterparty node modified the HTLC in transit,
317 /// * A probing attack where an intermediary node is trying to detect if we are the ultimate
318 /// recipient for a payment.
320 /// The payment hash of the payment we attempted to process.
321 payment_hash: PaymentHash
325 impl_writeable_tlv_based_enum_upgradable!(HTLCDestination,
326 (0, NextHopChannel) => {
327 (0, node_id, required),
328 (2, channel_id, required),
330 (1, InvalidForward) => {
331 (0, requested_forward_scid, required),
333 (2, UnknownNextHop) => {
334 (0, requested_forward_scid, required),
336 (3, InvalidOnion) => {},
337 (4, FailedPayment) => {
338 (0, payment_hash, required),
342 /// Will be used in [`Event::HTLCIntercepted`] to identify the next hop in the HTLC's path.
343 /// Currently only used in serialization for the sake of maintaining compatibility. More variants
344 /// will be added for general-purpose HTLC forward intercepts as well as trampoline forward
345 /// intercepts in upcoming work.
346 enum InterceptNextHop {
348 requested_next_hop_scid: u64,
352 impl_writeable_tlv_based_enum!(InterceptNextHop,
354 (0, requested_next_hop_scid, required),
358 /// The reason the payment failed. Used in [`Event::PaymentFailed`].
359 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
360 pub enum PaymentFailureReason {
361 /// The intended recipient rejected our payment.
363 /// The user chose to abandon this payment by calling [`ChannelManager::abandon_payment`].
365 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
367 /// We exhausted all of our retry attempts while trying to send the payment, or we
368 /// exhausted the [`Retry::Timeout`] if the user set one. If at any point a retry
369 /// attempt failed while being forwarded along the path, an [`Event::PaymentPathFailed`] will
370 /// have come before this.
372 /// [`Retry::Timeout`]: crate::ln::channelmanager::Retry::Timeout
374 /// The payment expired while retrying, based on the provided
375 /// [`PaymentParameters::expiry_time`].
377 /// [`PaymentParameters::expiry_time`]: crate::routing::router::PaymentParameters::expiry_time
379 /// We failed to find a route while retrying the payment.
381 /// Note that this generally indicates that we've exhausted the available set of possible
382 /// routes - we tried the payment over a few routes but were not able to find any further
383 /// candidate routes beyond those.
385 /// This error should generally never happen. This likely means that there is a problem with
390 impl_writeable_tlv_based_enum!(PaymentFailureReason,
391 (0, RecipientRejected) => {},
392 (2, UserAbandoned) => {},
393 (4, RetriesExhausted) => {},
394 (6, PaymentExpired) => {},
395 (8, RouteNotFound) => {},
396 (10, UnexpectedError) => {}, ;
399 /// An Event which you should probably take some action in response to.
401 /// Note that while Writeable and Readable are implemented for Event, you probably shouldn't use
402 /// them directly as they don't round-trip exactly (for example FundingGenerationReady is never
403 /// written as it makes no sense to respond to it after reconnecting to peers).
404 #[derive(Clone, Debug, PartialEq, Eq)]
406 /// Used to indicate that the client should generate a funding transaction with the given
407 /// parameters and then call [`ChannelManager::funding_transaction_generated`].
408 /// Generated in [`ChannelManager`] message handling.
409 /// Note that *all inputs* in the funding transaction must spend SegWit outputs or your
410 /// counterparty can steal your funds!
412 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
413 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
414 FundingGenerationReady {
415 /// The random channel_id we picked which you'll need to pass into
416 /// [`ChannelManager::funding_transaction_generated`].
418 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
419 temporary_channel_id: ChannelId,
420 /// The counterparty's node_id, which you'll need to pass back into
421 /// [`ChannelManager::funding_transaction_generated`].
423 /// [`ChannelManager::funding_transaction_generated`]: crate::ln::channelmanager::ChannelManager::funding_transaction_generated
424 counterparty_node_id: PublicKey,
425 /// The value, in satoshis, that the output should have.
426 channel_value_satoshis: u64,
427 /// The script which should be used in the transaction output.
428 output_script: ScriptBuf,
429 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
430 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
431 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
432 /// `user_channel_id` will be randomized for an inbound channel. This may be zero for objects
433 /// serialized with LDK versions prior to 0.0.113.
435 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
436 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
437 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
438 user_channel_id: u128,
440 /// Indicates that we've been offered a payment and it needs to be claimed via calling
441 /// [`ChannelManager::claim_funds`] with the preimage given in [`PaymentPurpose`].
443 /// Note that if the preimage is not known, you should call
444 /// [`ChannelManager::fail_htlc_backwards`] or [`ChannelManager::fail_htlc_backwards_with_reason`]
445 /// to free up resources for this HTLC and avoid network congestion.
447 /// If [`Event::PaymentClaimable::onion_fields`] is `Some`, and includes custom TLVs with even type
448 /// numbers, you should use [`ChannelManager::fail_htlc_backwards_with_reason`] with
449 /// [`FailureCode::InvalidOnionPayload`] if you fail to understand and handle the contents, or
450 /// [`ChannelManager::claim_funds_with_known_custom_tlvs`] upon successful handling.
451 /// If you don't intend to check for custom TLVs, you can simply use
452 /// [`ChannelManager::claim_funds`], which will automatically fail back even custom TLVs.
454 /// If you fail to call [`ChannelManager::claim_funds`],
455 /// [`ChannelManager::claim_funds_with_known_custom_tlvs`],
456 /// [`ChannelManager::fail_htlc_backwards`], or
457 /// [`ChannelManager::fail_htlc_backwards_with_reason`] within the HTLC's timeout, the HTLC will
458 /// be automatically failed.
461 /// LDK will not stop an inbound payment from being paid multiple times, so multiple
462 /// `PaymentClaimable` events may be generated for the same payment. In such a case it is
463 /// polite (and required in the lightning specification) to fail the payment the second time
464 /// and give the sender their money back rather than accepting double payment.
467 /// This event used to be called `PaymentReceived` in LDK versions 0.0.112 and earlier.
469 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
470 /// [`ChannelManager::claim_funds_with_known_custom_tlvs`]: crate::ln::channelmanager::ChannelManager::claim_funds_with_known_custom_tlvs
471 /// [`FailureCode::InvalidOnionPayload`]: crate::ln::channelmanager::FailureCode::InvalidOnionPayload
472 /// [`ChannelManager::fail_htlc_backwards`]: crate::ln::channelmanager::ChannelManager::fail_htlc_backwards
473 /// [`ChannelManager::fail_htlc_backwards_with_reason`]: crate::ln::channelmanager::ChannelManager::fail_htlc_backwards_with_reason
475 /// The node that will receive the payment after it has been claimed.
476 /// This is useful to identify payments received via [phantom nodes].
477 /// This field will always be filled in when the event was generated by LDK versions
478 /// 0.0.113 and above.
480 /// [phantom nodes]: crate::sign::PhantomKeysManager
481 receiver_node_id: Option<PublicKey>,
482 /// The hash for which the preimage should be handed to the ChannelManager. Note that LDK will
483 /// not stop you from registering duplicate payment hashes for inbound payments.
484 payment_hash: PaymentHash,
485 /// The fields in the onion which were received with each HTLC. Only fields which were
486 /// identical in each HTLC involved in the payment will be included here.
488 /// Payments received on LDK versions prior to 0.0.115 will have this field unset.
489 onion_fields: Option<RecipientOnionFields>,
490 /// The value, in thousandths of a satoshi, that this payment is claimable for. May be greater
491 /// than the invoice amount.
493 /// May be less than the invoice amount if [`ChannelConfig::accept_underpaying_htlcs`] is set
494 /// and the previous hop took an extra fee.
497 /// If [`ChannelConfig::accept_underpaying_htlcs`] is set and you claim without verifying this
498 /// field, you may lose money!
500 /// [`ChannelConfig::accept_underpaying_htlcs`]: crate::util::config::ChannelConfig::accept_underpaying_htlcs
502 /// The value, in thousands of a satoshi, that was skimmed off of this payment as an extra fee
503 /// taken by our channel counterparty.
505 /// Will always be 0 unless [`ChannelConfig::accept_underpaying_htlcs`] is set.
507 /// [`ChannelConfig::accept_underpaying_htlcs`]: crate::util::config::ChannelConfig::accept_underpaying_htlcs
508 counterparty_skimmed_fee_msat: u64,
509 /// Information for claiming this received payment, based on whether the purpose of the
510 /// payment is to pay an invoice or to send a spontaneous payment.
511 purpose: PaymentPurpose,
512 /// The `channel_id` indicating over which channel we received the payment.
513 via_channel_id: Option<ChannelId>,
514 /// The `user_channel_id` indicating over which channel we received the payment.
515 via_user_channel_id: Option<u128>,
516 /// The block height at which this payment will be failed back and will no longer be
517 /// eligible for claiming.
519 /// Prior to this height, a call to [`ChannelManager::claim_funds`] is guaranteed to
520 /// succeed, however you should wait for [`Event::PaymentClaimed`] to be sure.
522 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
523 claim_deadline: Option<u32>,
525 /// Indicates a payment has been claimed and we've received money!
527 /// This most likely occurs when [`ChannelManager::claim_funds`] has been called in response
528 /// to an [`Event::PaymentClaimable`]. However, if we previously crashed during a
529 /// [`ChannelManager::claim_funds`] call you may see this event without a corresponding
530 /// [`Event::PaymentClaimable`] event.
533 /// LDK will not stop an inbound payment from being paid multiple times, so multiple
534 /// `PaymentClaimable` events may be generated for the same payment. If you then call
535 /// [`ChannelManager::claim_funds`] twice for the same [`Event::PaymentClaimable`] you may get
536 /// multiple `PaymentClaimed` events.
538 /// [`ChannelManager::claim_funds`]: crate::ln::channelmanager::ChannelManager::claim_funds
540 /// The node that received the payment.
541 /// This is useful to identify payments which were received via [phantom nodes].
542 /// This field will always be filled in when the event was generated by LDK versions
543 /// 0.0.113 and above.
545 /// [phantom nodes]: crate::sign::PhantomKeysManager
546 receiver_node_id: Option<PublicKey>,
547 /// The payment hash of the claimed payment. Note that LDK will not stop you from
548 /// registering duplicate payment hashes for inbound payments.
549 payment_hash: PaymentHash,
550 /// The value, in thousandths of a satoshi, that this payment is for. May be greater than the
553 /// The purpose of the claimed payment, i.e. whether the payment was for an invoice or a
554 /// spontaneous payment.
555 purpose: PaymentPurpose,
556 /// The HTLCs that comprise the claimed payment. This will be empty for events serialized prior
557 /// to LDK version 0.0.117.
558 htlcs: Vec<ClaimedHTLC>,
559 /// The sender-intended sum total of all the MPP parts. This will be `None` for events
560 /// serialized prior to LDK version 0.0.117.
561 sender_intended_total_msat: Option<u64>,
563 /// Indicates that a peer connection with a node is needed in order to send an [`OnionMessage`].
565 /// Typically, this happens when a [`MessageRouter`] is unable to find a complete path to a
566 /// [`Destination`]. Once a connection is established, any messages buffered by an
567 /// [`OnionMessageHandler`] may be sent.
569 /// This event will not be generated for onion message forwards; only for sends including
570 /// replies. Handlers should connect to the node otherwise any buffered messages may be lost.
572 /// [`OnionMessage`]: msgs::OnionMessage
573 /// [`MessageRouter`]: crate::onion_message::messenger::MessageRouter
574 /// [`Destination`]: crate::onion_message::messenger::Destination
575 /// [`OnionMessageHandler`]: crate::ln::msgs::OnionMessageHandler
577 /// The node id for the node needing a connection.
579 /// Sockets for connecting to the node.
580 addresses: Vec<msgs::SocketAddress>,
582 /// Indicates a request for an invoice failed to yield a response in a reasonable amount of time
583 /// or was explicitly abandoned by [`ChannelManager::abandon_payment`]. This may be for an
584 /// [`InvoiceRequest`] sent for an [`Offer`] or for a [`Refund`] that hasn't been redeemed.
586 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
587 /// [`InvoiceRequest`]: crate::offers::invoice_request::InvoiceRequest
588 /// [`Offer`]: crate::offers::offer::Offer
589 /// [`Refund`]: crate::offers::refund::Refund
590 InvoiceRequestFailed {
591 /// The `payment_id` to have been associated with payment for the requested invoice.
592 payment_id: PaymentId,
594 /// Indicates an outbound payment we made succeeded (i.e. it made it all the way to its target
595 /// and we got back the payment preimage for it).
597 /// Note for MPP payments: in rare cases, this event may be preceded by a `PaymentPathFailed`
598 /// event. In this situation, you SHOULD treat this payment as having succeeded.
600 /// The `payment_id` passed to [`ChannelManager::send_payment`].
602 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
603 payment_id: Option<PaymentId>,
604 /// The preimage to the hash given to ChannelManager::send_payment.
605 /// Note that this serves as a payment receipt, if you wish to have such a thing, you must
606 /// store it somehow!
607 payment_preimage: PaymentPreimage,
608 /// The hash that was given to [`ChannelManager::send_payment`].
610 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
611 payment_hash: PaymentHash,
612 /// The total fee which was spent at intermediate hops in this payment, across all paths.
614 /// Note that, like [`Route::get_total_fees`] this does *not* include any potential
615 /// overpayment to the recipient node.
617 /// If the recipient or an intermediate node misbehaves and gives us free money, this may
618 /// overstate the amount paid, though this is unlikely.
620 /// [`Route::get_total_fees`]: crate::routing::router::Route::get_total_fees
621 fee_paid_msat: Option<u64>,
623 /// Indicates an outbound payment failed. Individual [`Event::PaymentPathFailed`] events
624 /// provide failure information for each path attempt in the payment, including retries.
626 /// This event is provided once there are no further pending HTLCs for the payment and the
627 /// payment is no longer retryable, due either to the [`Retry`] provided or
628 /// [`ChannelManager::abandon_payment`] having been called for the corresponding payment.
630 /// In exceedingly rare cases, it is possible that an [`Event::PaymentFailed`] is generated for
631 /// a payment after an [`Event::PaymentSent`] event for this same payment has already been
632 /// received and processed. In this case, the [`Event::PaymentFailed`] event MUST be ignored,
633 /// and the payment MUST be treated as having succeeded.
635 /// [`Retry`]: crate::ln::channelmanager::Retry
636 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
638 /// The `payment_id` passed to [`ChannelManager::send_payment`].
640 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
641 payment_id: PaymentId,
642 /// The hash that was given to [`ChannelManager::send_payment`].
644 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
645 payment_hash: PaymentHash,
646 /// The reason the payment failed. This is only `None` for events generated or serialized
647 /// by versions prior to 0.0.115.
648 reason: Option<PaymentFailureReason>,
650 /// Indicates that a path for an outbound payment was successful.
652 /// Always generated after [`Event::PaymentSent`] and thus useful for scoring channels. See
653 /// [`Event::PaymentSent`] for obtaining the payment preimage.
654 PaymentPathSuccessful {
655 /// The `payment_id` passed to [`ChannelManager::send_payment`].
657 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
658 payment_id: PaymentId,
659 /// The hash that was given to [`ChannelManager::send_payment`].
661 /// This will be `Some` for all payments which completed on LDK 0.0.104 or later.
663 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
664 payment_hash: Option<PaymentHash>,
665 /// The payment path that was successful.
667 /// May contain a closed channel if the HTLC sent along the path was fulfilled on chain.
670 /// Indicates an outbound HTLC we sent failed, likely due to an intermediary node being unable to
673 /// Note that this does *not* indicate that all paths for an MPP payment have failed, see
674 /// [`Event::PaymentFailed`].
676 /// See [`ChannelManager::abandon_payment`] for giving up on this payment before its retries have
679 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
681 /// The `payment_id` passed to [`ChannelManager::send_payment`].
683 /// This will be `Some` for all payment paths which failed on LDK 0.0.103 or later.
685 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
686 /// [`ChannelManager::abandon_payment`]: crate::ln::channelmanager::ChannelManager::abandon_payment
687 payment_id: Option<PaymentId>,
688 /// The hash that was given to [`ChannelManager::send_payment`].
690 /// [`ChannelManager::send_payment`]: crate::ln::channelmanager::ChannelManager::send_payment
691 payment_hash: PaymentHash,
692 /// Indicates the payment was rejected for some reason by the recipient. This implies that
693 /// the payment has failed, not just the route in question. If this is not set, the payment may
694 /// be retried via a different route.
695 payment_failed_permanently: bool,
696 /// Extra error details based on the failure type. May contain an update that needs to be
697 /// applied to the [`NetworkGraph`].
699 /// [`NetworkGraph`]: crate::routing::gossip::NetworkGraph
700 failure: PathFailure,
701 /// The payment path that failed.
703 /// The channel responsible for the failed payment path.
705 /// Note that for route hints or for the first hop in a path this may be an SCID alias and
706 /// may not refer to a channel in the public network graph. These aliases may also collide
707 /// with channels in the public network graph.
709 /// If this is `Some`, then the corresponding channel should be avoided when the payment is
710 /// retried. May be `None` for older [`Event`] serializations.
711 short_channel_id: Option<u64>,
713 error_code: Option<u16>,
715 error_data: Option<Vec<u8>>,
717 /// Indicates that a probe payment we sent returned successful, i.e., only failed at the destination.
719 /// The id returned by [`ChannelManager::send_probe`].
721 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
722 payment_id: PaymentId,
723 /// The hash generated by [`ChannelManager::send_probe`].
725 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
726 payment_hash: PaymentHash,
727 /// The payment path that was successful.
730 /// Indicates that a probe payment we sent failed at an intermediary node on the path.
732 /// The id returned by [`ChannelManager::send_probe`].
734 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
735 payment_id: PaymentId,
736 /// The hash generated by [`ChannelManager::send_probe`].
738 /// [`ChannelManager::send_probe`]: crate::ln::channelmanager::ChannelManager::send_probe
739 payment_hash: PaymentHash,
740 /// The payment path that failed.
742 /// The channel responsible for the failed probe.
744 /// Note that for route hints or for the first hop in a path this may be an SCID alias and
745 /// may not refer to a channel in the public network graph. These aliases may also collide
746 /// with channels in the public network graph.
747 short_channel_id: Option<u64>,
749 /// Used to indicate that [`ChannelManager::process_pending_htlc_forwards`] should be called at
750 /// a time in the future.
752 /// [`ChannelManager::process_pending_htlc_forwards`]: crate::ln::channelmanager::ChannelManager::process_pending_htlc_forwards
753 PendingHTLCsForwardable {
754 /// The minimum amount of time that should be waited prior to calling
755 /// process_pending_htlc_forwards. To increase the effort required to correlate payments,
756 /// you should wait a random amount of time in roughly the range (now + time_forwardable,
757 /// now + 5*time_forwardable).
758 time_forwardable: Duration,
760 /// Used to indicate that we've intercepted an HTLC forward. This event will only be generated if
761 /// you've encoded an intercept scid in the receiver's invoice route hints using
762 /// [`ChannelManager::get_intercept_scid`] and have set [`UserConfig::accept_intercept_htlcs`].
764 /// [`ChannelManager::forward_intercepted_htlc`] or
765 /// [`ChannelManager::fail_intercepted_htlc`] MUST be called in response to this event. See
766 /// their docs for more information.
768 /// [`ChannelManager::get_intercept_scid`]: crate::ln::channelmanager::ChannelManager::get_intercept_scid
769 /// [`UserConfig::accept_intercept_htlcs`]: crate::util::config::UserConfig::accept_intercept_htlcs
770 /// [`ChannelManager::forward_intercepted_htlc`]: crate::ln::channelmanager::ChannelManager::forward_intercepted_htlc
771 /// [`ChannelManager::fail_intercepted_htlc`]: crate::ln::channelmanager::ChannelManager::fail_intercepted_htlc
773 /// An id to help LDK identify which HTLC is being forwarded or failed.
774 intercept_id: InterceptId,
775 /// The fake scid that was programmed as the next hop's scid, generated using
776 /// [`ChannelManager::get_intercept_scid`].
778 /// [`ChannelManager::get_intercept_scid`]: crate::ln::channelmanager::ChannelManager::get_intercept_scid
779 requested_next_hop_scid: u64,
780 /// The payment hash used for this HTLC.
781 payment_hash: PaymentHash,
782 /// How many msats were received on the inbound edge of this HTLC.
783 inbound_amount_msat: u64,
784 /// How many msats the payer intended to route to the next node. Depending on the reason you are
785 /// intercepting this payment, you might take a fee by forwarding less than this amount.
786 /// Forwarding less than this amount may break compatibility with LDK versions prior to 0.0.116.
788 /// Note that LDK will NOT check that expected fees were factored into this value. You MUST
789 /// check that whatever fee you want has been included here or subtract it as required. Further,
790 /// LDK will not stop you from forwarding more than you received.
791 expected_outbound_amount_msat: u64,
793 /// Used to indicate that an output which you should know how to spend was confirmed on chain
794 /// and is now spendable.
796 /// Such an output will *never* be spent directly by LDK, and are not at risk of your
797 /// counterparty spending them due to some kind of timeout. Thus, you need to store them
798 /// somewhere and spend them when you create on-chain transactions.
800 /// You may hand them to the [`OutputSweeper`] utility which will store and (re-)generate spending
801 /// transactions for you.
803 /// [`OutputSweeper`]: crate::util::sweep::OutputSweeper
805 /// The outputs which you should store as spendable by you.
806 outputs: Vec<SpendableOutputDescriptor>,
807 /// The `channel_id` indicating which channel the spendable outputs belong to.
809 /// This will always be `Some` for events generated by LDK versions 0.0.117 and above.
810 channel_id: Option<ChannelId>,
812 /// This event is generated when a payment has been successfully forwarded through us and a
813 /// forwarding fee earned.
815 /// The channel id of the incoming channel between the previous node and us.
817 /// This is only `None` for events generated or serialized by versions prior to 0.0.107.
818 prev_channel_id: Option<ChannelId>,
819 /// The channel id of the outgoing channel between the next node and us.
821 /// This is only `None` for events generated or serialized by versions prior to 0.0.107.
822 next_channel_id: Option<ChannelId>,
823 /// The `user_channel_id` of the incoming channel between the previous node and us.
825 /// This is only `None` for events generated or serialized by versions prior to 0.0.122.
826 prev_user_channel_id: Option<u128>,
827 /// The `user_channel_id` of the outgoing channel between the next node and us.
829 /// This will be `None` if the payment was settled via an on-chain transaction. See the
830 /// caveat described for the `total_fee_earned_msat` field. Moreover it will be `None` for
831 /// events generated or serialized by versions prior to 0.0.122.
832 next_user_channel_id: Option<u128>,
833 /// The total fee, in milli-satoshis, which was earned as a result of the payment.
835 /// Note that if we force-closed the channel over which we forwarded an HTLC while the HTLC
836 /// was pending, the amount the next hop claimed will have been rounded down to the nearest
837 /// whole satoshi. Thus, the fee calculated here may be higher than expected as we still
838 /// claimed the full value in millisatoshis from the source. In this case,
839 /// `claim_from_onchain_tx` will be set.
841 /// If the channel which sent us the payment has been force-closed, we will claim the funds
842 /// via an on-chain transaction. In that case we do not yet know the on-chain transaction
843 /// fees which we will spend and will instead set this to `None`. It is possible duplicate
844 /// `PaymentForwarded` events are generated for the same payment iff `total_fee_earned_msat` is
846 total_fee_earned_msat: Option<u64>,
847 /// The share of the total fee, in milli-satoshis, which was withheld in addition to the
850 /// This will only be `Some` if we forwarded an intercepted HTLC with less than the
851 /// expected amount. This means our counterparty accepted to receive less than the invoice
852 /// amount, e.g., by claiming the payment featuring a corresponding
853 /// [`PaymentClaimable::counterparty_skimmed_fee_msat`].
855 /// Will also always be `None` for events serialized with LDK prior to version 0.0.122.
857 /// The caveat described above the `total_fee_earned_msat` field applies here as well.
859 /// [`PaymentClaimable::counterparty_skimmed_fee_msat`]: Self::PaymentClaimable::counterparty_skimmed_fee_msat
860 skimmed_fee_msat: Option<u64>,
861 /// If this is `true`, the forwarded HTLC was claimed by our counterparty via an on-chain
863 claim_from_onchain_tx: bool,
864 /// The final amount forwarded, in milli-satoshis, after the fee is deducted.
866 /// The caveat described above the `total_fee_earned_msat` field applies here as well.
867 outbound_amount_forwarded_msat: Option<u64>,
869 /// Used to indicate that a channel with the given `channel_id` is being opened and pending
870 /// confirmation on-chain.
872 /// This event is emitted when the funding transaction has been signed and is broadcast to the
873 /// network. For 0conf channels it will be immediately followed by the corresponding
874 /// [`Event::ChannelReady`] event.
876 /// The `channel_id` of the channel that is pending confirmation.
877 channel_id: ChannelId,
878 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
879 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
880 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
881 /// `user_channel_id` will be randomized for an inbound channel.
883 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
884 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
885 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
886 user_channel_id: u128,
887 /// The `temporary_channel_id` this channel used to be known by during channel establishment.
889 /// Will be `None` for channels created prior to LDK version 0.0.115.
890 former_temporary_channel_id: Option<ChannelId>,
891 /// The `node_id` of the channel counterparty.
892 counterparty_node_id: PublicKey,
893 /// The outpoint of the channel's funding transaction.
894 funding_txo: OutPoint,
895 /// The features that this channel will operate with.
897 /// Will be `None` for channels created prior to LDK version 0.0.122.
898 channel_type: Option<ChannelTypeFeatures>,
900 /// Used to indicate that a channel with the given `channel_id` is ready to
901 /// be used. This event is emitted either when the funding transaction has been confirmed
902 /// on-chain, or, in case of a 0conf channel, when both parties have confirmed the channel
905 /// The `channel_id` of the channel that is ready.
906 channel_id: ChannelId,
907 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
908 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
909 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
910 /// `user_channel_id` will be randomized for an inbound channel.
912 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
913 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
914 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
915 user_channel_id: u128,
916 /// The `node_id` of the channel counterparty.
917 counterparty_node_id: PublicKey,
918 /// The features that this channel will operate with.
919 channel_type: ChannelTypeFeatures,
921 /// Used to indicate that a previously opened channel with the given `channel_id` is in the
922 /// process of closure.
924 /// Note that this event is only triggered for accepted channels: if the
925 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true and the channel is
926 /// rejected, no `ChannelClosed` event will be sent.
928 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
929 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
931 /// The `channel_id` of the channel which has been closed. Note that on-chain transactions
932 /// resolving the channel are likely still awaiting confirmation.
933 channel_id: ChannelId,
934 /// The `user_channel_id` value passed in to [`ChannelManager::create_channel`] for outbound
935 /// channels, or to [`ChannelManager::accept_inbound_channel`] for inbound channels if
936 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true. Otherwise
937 /// `user_channel_id` will be randomized for inbound channels.
938 /// This may be zero for inbound channels serialized prior to 0.0.113 and will always be
939 /// zero for objects serialized with LDK versions prior to 0.0.102.
941 /// [`ChannelManager::create_channel`]: crate::ln::channelmanager::ChannelManager::create_channel
942 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
943 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
944 user_channel_id: u128,
945 /// The reason the channel was closed.
946 reason: ClosureReason,
947 /// Counterparty in the closed channel.
949 /// This field will be `None` for objects serialized prior to LDK 0.0.117.
950 counterparty_node_id: Option<PublicKey>,
951 /// Channel capacity of the closing channel (sats).
953 /// This field will be `None` for objects serialized prior to LDK 0.0.117.
954 channel_capacity_sats: Option<u64>,
955 /// The original channel funding TXO; this helps checking for the existence and confirmation
956 /// status of the closing tx.
957 /// Note that for instances serialized in v0.0.119 or prior this will be missing (None).
958 channel_funding_txo: Option<transaction::OutPoint>,
960 /// Used to indicate to the user that they can abandon the funding transaction and recycle the
961 /// inputs for another purpose.
963 /// This event is not guaranteed to be generated for channels that are closed due to a restart.
965 /// The channel_id of the channel which has been closed.
966 channel_id: ChannelId,
967 /// The full transaction received from the user
968 transaction: Transaction
970 /// Indicates a request to open a new channel by a peer.
972 /// To accept the request, call [`ChannelManager::accept_inbound_channel`]. To reject the request,
973 /// call [`ChannelManager::force_close_without_broadcasting_txn`]. Note that a ['ChannelClosed`]
974 /// event will _not_ be triggered if the channel is rejected.
976 /// The event is only triggered when a new open channel request is received and the
977 /// [`UserConfig::manually_accept_inbound_channels`] config flag is set to true.
979 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
980 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
981 /// [`UserConfig::manually_accept_inbound_channels`]: crate::util::config::UserConfig::manually_accept_inbound_channels
983 /// The temporary channel ID of the channel requested to be opened.
985 /// When responding to the request, the `temporary_channel_id` should be passed
986 /// back to the ChannelManager through [`ChannelManager::accept_inbound_channel`] to accept,
987 /// or through [`ChannelManager::force_close_without_broadcasting_txn`] to reject.
989 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
990 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
991 temporary_channel_id: ChannelId,
992 /// The node_id of the counterparty requesting to open the channel.
994 /// When responding to the request, the `counterparty_node_id` should be passed
995 /// back to the `ChannelManager` through [`ChannelManager::accept_inbound_channel`] to
996 /// accept the request, or through [`ChannelManager::force_close_without_broadcasting_txn`] to reject the
999 /// [`ChannelManager::accept_inbound_channel`]: crate::ln::channelmanager::ChannelManager::accept_inbound_channel
1000 /// [`ChannelManager::force_close_without_broadcasting_txn`]: crate::ln::channelmanager::ChannelManager::force_close_without_broadcasting_txn
1001 counterparty_node_id: PublicKey,
1002 /// The channel value of the requested channel.
1003 funding_satoshis: u64,
1004 /// Our starting balance in the channel if the request is accepted, in milli-satoshi.
1006 /// The features that this channel will operate with. If you reject the channel, a
1007 /// well-behaved counterparty may automatically re-attempt the channel with a new set of
1010 /// Note that if [`ChannelTypeFeatures::supports_scid_privacy`] returns true on this type,
1011 /// the resulting [`ChannelManager`] will not be readable by versions of LDK prior to
1014 /// Furthermore, note that if [`ChannelTypeFeatures::supports_zero_conf`] returns true on this type,
1015 /// the resulting [`ChannelManager`] will not be readable by versions of LDK prior to
1016 /// 0.0.107. Channels setting this type also need to get manually accepted via
1017 /// [`crate::ln::channelmanager::ChannelManager::accept_inbound_channel_from_trusted_peer_0conf`],
1018 /// or will be rejected otherwise.
1020 /// [`ChannelManager`]: crate::ln::channelmanager::ChannelManager
1021 channel_type: ChannelTypeFeatures,
1023 /// Indicates that the HTLC was accepted, but could not be processed when or after attempting to
1026 /// Some scenarios where this event may be sent include:
1027 /// * Insufficient capacity in the outbound channel
1028 /// * While waiting to forward the HTLC, the channel it is meant to be forwarded through closes
1029 /// * When an unknown SCID is requested for forwarding a payment.
1030 /// * Expected MPP amount has already been reached
1031 /// * The HTLC has timed out
1033 /// This event, however, does not get generated if an HTLC fails to meet the forwarding
1034 /// requirements (i.e. insufficient fees paid, or a CLTV that is too soon).
1035 HTLCHandlingFailed {
1036 /// The channel over which the HTLC was received.
1037 prev_channel_id: ChannelId,
1038 /// Destination of the HTLC that failed to be processed.
1039 failed_next_destination: HTLCDestination,
1041 /// Indicates that a transaction originating from LDK needs to have its fee bumped. This event
1042 /// requires confirmed external funds to be readily available to spend.
1044 /// LDK does not currently generate this event unless the
1045 /// [`ChannelHandshakeConfig::negotiate_anchors_zero_fee_htlc_tx`] config flag is set to true.
1046 /// It is limited to the scope of channels with anchor outputs.
1048 /// [`ChannelHandshakeConfig::negotiate_anchors_zero_fee_htlc_tx`]: crate::util::config::ChannelHandshakeConfig::negotiate_anchors_zero_fee_htlc_tx
1049 BumpTransaction(BumpTransactionEvent),
1052 impl Writeable for Event {
1053 fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
1055 &Event::FundingGenerationReady { .. } => {
1057 // We never write out FundingGenerationReady events as, upon disconnection, peers
1058 // drop any channels which have not yet exchanged funding_signed.
1060 &Event::PaymentClaimable { ref payment_hash, ref amount_msat, counterparty_skimmed_fee_msat,
1061 ref purpose, ref receiver_node_id, ref via_channel_id, ref via_user_channel_id,
1062 ref claim_deadline, ref onion_fields
1065 let mut payment_secret = None;
1066 let payment_preimage;
1068 PaymentPurpose::InvoicePayment { payment_preimage: preimage, payment_secret: secret } => {
1069 payment_secret = Some(secret);
1070 payment_preimage = *preimage;
1072 PaymentPurpose::SpontaneousPayment(preimage) => {
1073 payment_preimage = Some(*preimage);
1076 let skimmed_fee_opt = if counterparty_skimmed_fee_msat == 0 { None }
1077 else { Some(counterparty_skimmed_fee_msat) };
1078 write_tlv_fields!(writer, {
1079 (0, payment_hash, required),
1080 (1, receiver_node_id, option),
1081 (2, payment_secret, option),
1082 (3, via_channel_id, option),
1083 (4, amount_msat, required),
1084 (5, via_user_channel_id, option),
1085 // Type 6 was `user_payment_id` on 0.0.103 and earlier
1086 (7, claim_deadline, option),
1087 (8, payment_preimage, option),
1088 (9, onion_fields, option),
1089 (10, skimmed_fee_opt, option),
1092 &Event::PaymentSent { ref payment_id, ref payment_preimage, ref payment_hash, ref fee_paid_msat } => {
1094 write_tlv_fields!(writer, {
1095 (0, payment_preimage, required),
1096 (1, payment_hash, required),
1097 (3, payment_id, option),
1098 (5, fee_paid_msat, option),
1101 &Event::PaymentPathFailed {
1102 ref payment_id, ref payment_hash, ref payment_failed_permanently, ref failure,
1103 ref path, ref short_channel_id,
1111 error_code.write(writer)?;
1113 error_data.write(writer)?;
1114 write_tlv_fields!(writer, {
1115 (0, payment_hash, required),
1116 (1, None::<NetworkUpdate>, option), // network_update in LDK versions prior to 0.0.114
1117 (2, payment_failed_permanently, required),
1118 (3, false, required), // all_paths_failed in LDK versions prior to 0.0.114
1119 (4, path.blinded_tail, option),
1120 (5, path.hops, required_vec),
1121 (7, short_channel_id, option),
1122 (9, None::<RouteParameters>, option), // retry in LDK versions prior to 0.0.115
1123 (11, payment_id, option),
1124 (13, failure, required),
1127 &Event::PendingHTLCsForwardable { time_forwardable: _ } => {
1129 // Note that we now ignore these on the read end as we'll re-generate them in
1130 // ChannelManager, we write them here only for backwards compatibility.
1132 &Event::SpendableOutputs { ref outputs, channel_id } => {
1134 write_tlv_fields!(writer, {
1135 (0, WithoutLength(outputs), required),
1136 (1, channel_id, option),
1139 &Event::HTLCIntercepted { requested_next_hop_scid, payment_hash, inbound_amount_msat, expected_outbound_amount_msat, intercept_id } => {
1141 let intercept_scid = InterceptNextHop::FakeScid { requested_next_hop_scid };
1142 write_tlv_fields!(writer, {
1143 (0, intercept_id, required),
1144 (2, intercept_scid, required),
1145 (4, payment_hash, required),
1146 (6, inbound_amount_msat, required),
1147 (8, expected_outbound_amount_msat, required),
1150 &Event::PaymentForwarded {
1151 prev_channel_id, next_channel_id, prev_user_channel_id, next_user_channel_id,
1152 total_fee_earned_msat, skimmed_fee_msat, claim_from_onchain_tx,
1153 outbound_amount_forwarded_msat,
1156 write_tlv_fields!(writer, {
1157 (0, total_fee_earned_msat, option),
1158 (1, prev_channel_id, option),
1159 (2, claim_from_onchain_tx, required),
1160 (3, next_channel_id, option),
1161 (5, outbound_amount_forwarded_msat, option),
1162 (7, skimmed_fee_msat, option),
1163 (9, prev_user_channel_id, option),
1164 (11, next_user_channel_id, option),
1167 &Event::ChannelClosed { ref channel_id, ref user_channel_id, ref reason,
1168 ref counterparty_node_id, ref channel_capacity_sats, ref channel_funding_txo
1171 // `user_channel_id` used to be a single u64 value. In order to remain backwards
1172 // compatible with versions prior to 0.0.113, the u128 is serialized as two
1173 // separate u64 values.
1174 let user_channel_id_low = *user_channel_id as u64;
1175 let user_channel_id_high = (*user_channel_id >> 64) as u64;
1176 write_tlv_fields!(writer, {
1177 (0, channel_id, required),
1178 (1, user_channel_id_low, required),
1179 (2, reason, required),
1180 (3, user_channel_id_high, required),
1181 (5, counterparty_node_id, option),
1182 (7, channel_capacity_sats, option),
1183 (9, channel_funding_txo, option),
1186 &Event::DiscardFunding { ref channel_id, ref transaction } => {
1187 11u8.write(writer)?;
1188 write_tlv_fields!(writer, {
1189 (0, channel_id, required),
1190 (2, transaction, required)
1193 &Event::PaymentPathSuccessful { ref payment_id, ref payment_hash, ref path } => {
1194 13u8.write(writer)?;
1195 write_tlv_fields!(writer, {
1196 (0, payment_id, required),
1197 (2, payment_hash, option),
1198 (4, path.hops, required_vec),
1199 (6, path.blinded_tail, option),
1202 &Event::PaymentFailed { ref payment_id, ref payment_hash, ref reason } => {
1203 15u8.write(writer)?;
1204 write_tlv_fields!(writer, {
1205 (0, payment_id, required),
1206 (1, reason, option),
1207 (2, payment_hash, required),
1210 &Event::OpenChannelRequest { .. } => {
1211 17u8.write(writer)?;
1212 // We never write the OpenChannelRequest events as, upon disconnection, peers
1213 // drop any channels which have not yet exchanged funding_signed.
1215 &Event::PaymentClaimed { ref payment_hash, ref amount_msat, ref purpose, ref receiver_node_id, ref htlcs, ref sender_intended_total_msat } => {
1216 19u8.write(writer)?;
1217 write_tlv_fields!(writer, {
1218 (0, payment_hash, required),
1219 (1, receiver_node_id, option),
1220 (2, purpose, required),
1221 (4, amount_msat, required),
1222 (5, *htlcs, optional_vec),
1223 (7, sender_intended_total_msat, option),
1226 &Event::ProbeSuccessful { ref payment_id, ref payment_hash, ref path } => {
1227 21u8.write(writer)?;
1228 write_tlv_fields!(writer, {
1229 (0, payment_id, required),
1230 (2, payment_hash, required),
1231 (4, path.hops, required_vec),
1232 (6, path.blinded_tail, option),
1235 &Event::ProbeFailed { ref payment_id, ref payment_hash, ref path, ref short_channel_id } => {
1236 23u8.write(writer)?;
1237 write_tlv_fields!(writer, {
1238 (0, payment_id, required),
1239 (2, payment_hash, required),
1240 (4, path.hops, required_vec),
1241 (6, short_channel_id, option),
1242 (8, path.blinded_tail, option),
1245 &Event::HTLCHandlingFailed { ref prev_channel_id, ref failed_next_destination } => {
1246 25u8.write(writer)?;
1247 write_tlv_fields!(writer, {
1248 (0, prev_channel_id, required),
1249 (2, failed_next_destination, required),
1252 &Event::BumpTransaction(ref event)=> {
1253 27u8.write(writer)?;
1255 // We never write the ChannelClose|HTLCResolution events as they'll be replayed
1256 // upon restarting anyway if they remain unresolved.
1257 BumpTransactionEvent::ChannelClose { .. } => {}
1258 BumpTransactionEvent::HTLCResolution { .. } => {}
1260 write_tlv_fields!(writer, {}); // Write a length field for forwards compat
1262 &Event::ChannelReady { ref channel_id, ref user_channel_id, ref counterparty_node_id, ref channel_type } => {
1263 29u8.write(writer)?;
1264 write_tlv_fields!(writer, {
1265 (0, channel_id, required),
1266 (2, user_channel_id, required),
1267 (4, counterparty_node_id, required),
1268 (6, channel_type, required),
1271 &Event::ChannelPending { ref channel_id, ref user_channel_id,
1272 ref former_temporary_channel_id, ref counterparty_node_id, ref funding_txo,
1275 31u8.write(writer)?;
1276 write_tlv_fields!(writer, {
1277 (0, channel_id, required),
1278 (1, channel_type, option),
1279 (2, user_channel_id, required),
1280 (4, former_temporary_channel_id, required),
1281 (6, counterparty_node_id, required),
1282 (8, funding_txo, required),
1285 &Event::InvoiceRequestFailed { ref payment_id } => {
1286 33u8.write(writer)?;
1287 write_tlv_fields!(writer, {
1288 (0, payment_id, required),
1291 &Event::ConnectionNeeded { .. } => {
1292 35u8.write(writer)?;
1293 // Never write ConnectionNeeded events as buffered onion messages aren't serialized.
1295 // Note that, going forward, all new events must only write data inside of
1296 // `write_tlv_fields`. Versions 0.0.101+ will ignore odd-numbered events that write
1297 // data via `write_tlv_fields`.
1302 impl MaybeReadable for Event {
1303 fn read<R: io::Read>(reader: &mut R) -> Result<Option<Self>, msgs::DecodeError> {
1304 match Readable::read(reader)? {
1305 // Note that we do not write a length-prefixed TLV for FundingGenerationReady events.
1309 let mut payment_hash = PaymentHash([0; 32]);
1310 let mut payment_preimage = None;
1311 let mut payment_secret = None;
1312 let mut amount_msat = 0;
1313 let mut counterparty_skimmed_fee_msat_opt = None;
1314 let mut receiver_node_id = None;
1315 let mut _user_payment_id = None::<u64>; // Used in 0.0.103 and earlier, no longer written in 0.0.116+.
1316 let mut via_channel_id = None;
1317 let mut claim_deadline = None;
1318 let mut via_user_channel_id = None;
1319 let mut onion_fields = None;
1320 read_tlv_fields!(reader, {
1321 (0, payment_hash, required),
1322 (1, receiver_node_id, option),
1323 (2, payment_secret, option),
1324 (3, via_channel_id, option),
1325 (4, amount_msat, required),
1326 (5, via_user_channel_id, option),
1327 (6, _user_payment_id, option),
1328 (7, claim_deadline, option),
1329 (8, payment_preimage, option),
1330 (9, onion_fields, option),
1331 (10, counterparty_skimmed_fee_msat_opt, option),
1333 let purpose = match payment_secret {
1334 Some(secret) => PaymentPurpose::InvoicePayment {
1336 payment_secret: secret
1338 None if payment_preimage.is_some() => PaymentPurpose::SpontaneousPayment(payment_preimage.unwrap()),
1339 None => return Err(msgs::DecodeError::InvalidValue),
1341 Ok(Some(Event::PaymentClaimable {
1345 counterparty_skimmed_fee_msat: counterparty_skimmed_fee_msat_opt.unwrap_or(0),
1348 via_user_channel_id,
1357 let mut payment_preimage = PaymentPreimage([0; 32]);
1358 let mut payment_hash = None;
1359 let mut payment_id = None;
1360 let mut fee_paid_msat = None;
1361 read_tlv_fields!(reader, {
1362 (0, payment_preimage, required),
1363 (1, payment_hash, option),
1364 (3, payment_id, option),
1365 (5, fee_paid_msat, option),
1367 if payment_hash.is_none() {
1368 payment_hash = Some(PaymentHash(Sha256::hash(&payment_preimage.0[..]).to_byte_array()));
1370 Ok(Some(Event::PaymentSent {
1373 payment_hash: payment_hash.unwrap(),
1382 let error_code = Readable::read(reader)?;
1384 let error_data = Readable::read(reader)?;
1385 let mut payment_hash = PaymentHash([0; 32]);
1386 let mut payment_failed_permanently = false;
1387 let mut network_update = None;
1388 let mut blinded_tail: Option<BlindedTail> = None;
1389 let mut path: Option<Vec<RouteHop>> = Some(vec![]);
1390 let mut short_channel_id = None;
1391 let mut payment_id = None;
1392 let mut failure_opt = None;
1393 read_tlv_fields!(reader, {
1394 (0, payment_hash, required),
1395 (1, network_update, upgradable_option),
1396 (2, payment_failed_permanently, required),
1397 (4, blinded_tail, option),
1398 // Added as a part of LDK 0.0.101 and always filled in since.
1399 // Defaults to an empty Vec, though likely should have been `Option`al.
1400 (5, path, optional_vec),
1401 (7, short_channel_id, option),
1402 (11, payment_id, option),
1403 (13, failure_opt, upgradable_option),
1405 let failure = failure_opt.unwrap_or_else(|| PathFailure::OnPath { network_update });
1406 Ok(Some(Event::PaymentPathFailed {
1409 payment_failed_permanently,
1411 path: Path { hops: path.unwrap(), blinded_tail },
1424 let mut outputs = WithoutLength(Vec::new());
1425 let mut channel_id: Option<ChannelId> = None;
1426 read_tlv_fields!(reader, {
1427 (0, outputs, required),
1428 (1, channel_id, option),
1430 Ok(Some(Event::SpendableOutputs { outputs: outputs.0, channel_id }))
1435 let mut payment_hash = PaymentHash([0; 32]);
1436 let mut intercept_id = InterceptId([0; 32]);
1437 let mut requested_next_hop_scid = InterceptNextHop::FakeScid { requested_next_hop_scid: 0 };
1438 let mut inbound_amount_msat = 0;
1439 let mut expected_outbound_amount_msat = 0;
1440 read_tlv_fields!(reader, {
1441 (0, intercept_id, required),
1442 (2, requested_next_hop_scid, required),
1443 (4, payment_hash, required),
1444 (6, inbound_amount_msat, required),
1445 (8, expected_outbound_amount_msat, required),
1447 let next_scid = match requested_next_hop_scid {
1448 InterceptNextHop::FakeScid { requested_next_hop_scid: scid } => scid
1450 Ok(Some(Event::HTLCIntercepted {
1452 requested_next_hop_scid: next_scid,
1453 inbound_amount_msat,
1454 expected_outbound_amount_msat,
1460 let mut prev_channel_id = None;
1461 let mut next_channel_id = None;
1462 let mut prev_user_channel_id = None;
1463 let mut next_user_channel_id = None;
1464 let mut total_fee_earned_msat = None;
1465 let mut skimmed_fee_msat = None;
1466 let mut claim_from_onchain_tx = false;
1467 let mut outbound_amount_forwarded_msat = None;
1468 read_tlv_fields!(reader, {
1469 (0, total_fee_earned_msat, option),
1470 (1, prev_channel_id, option),
1471 (2, claim_from_onchain_tx, required),
1472 (3, next_channel_id, option),
1473 (5, outbound_amount_forwarded_msat, option),
1474 (7, skimmed_fee_msat, option),
1475 (9, prev_user_channel_id, option),
1476 (11, next_user_channel_id, option),
1478 Ok(Some(Event::PaymentForwarded {
1479 prev_channel_id, next_channel_id, prev_user_channel_id,
1480 next_user_channel_id, total_fee_earned_msat, skimmed_fee_msat,
1481 claim_from_onchain_tx, outbound_amount_forwarded_msat,
1488 let mut channel_id = ChannelId::new_zero();
1489 let mut reason = UpgradableRequired(None);
1490 let mut user_channel_id_low_opt: Option<u64> = None;
1491 let mut user_channel_id_high_opt: Option<u64> = None;
1492 let mut counterparty_node_id = None;
1493 let mut channel_capacity_sats = None;
1494 let mut channel_funding_txo = None;
1495 read_tlv_fields!(reader, {
1496 (0, channel_id, required),
1497 (1, user_channel_id_low_opt, option),
1498 (2, reason, upgradable_required),
1499 (3, user_channel_id_high_opt, option),
1500 (5, counterparty_node_id, option),
1501 (7, channel_capacity_sats, option),
1502 (9, channel_funding_txo, option),
1505 // `user_channel_id` used to be a single u64 value. In order to remain
1506 // backwards compatible with versions prior to 0.0.113, the u128 is serialized
1507 // as two separate u64 values.
1508 let user_channel_id = (user_channel_id_low_opt.unwrap_or(0) as u128) +
1509 ((user_channel_id_high_opt.unwrap_or(0) as u128) << 64);
1511 Ok(Some(Event::ChannelClosed { channel_id, user_channel_id, reason: _init_tlv_based_struct_field!(reason, upgradable_required),
1512 counterparty_node_id, channel_capacity_sats, channel_funding_txo }))
1518 let mut channel_id = ChannelId::new_zero();
1519 let mut transaction = Transaction{ version: 2, lock_time: LockTime::ZERO, input: Vec::new(), output: Vec::new() };
1520 read_tlv_fields!(reader, {
1521 (0, channel_id, required),
1522 (2, transaction, required),
1524 Ok(Some(Event::DiscardFunding { channel_id, transaction } ))
1530 _init_and_read_len_prefixed_tlv_fields!(reader, {
1531 (0, payment_id, required),
1532 (2, payment_hash, option),
1533 (4, path, required_vec),
1534 (6, blinded_tail, option),
1536 Ok(Some(Event::PaymentPathSuccessful {
1537 payment_id: payment_id.0.unwrap(),
1539 path: Path { hops: path, blinded_tail },
1546 let mut payment_hash = PaymentHash([0; 32]);
1547 let mut payment_id = PaymentId([0; 32]);
1548 let mut reason = None;
1549 read_tlv_fields!(reader, {
1550 (0, payment_id, required),
1551 (1, reason, upgradable_option),
1552 (2, payment_hash, required),
1554 Ok(Some(Event::PaymentFailed {
1563 // Value 17 is used for `Event::OpenChannelRequest`.
1568 let mut payment_hash = PaymentHash([0; 32]);
1569 let mut purpose = UpgradableRequired(None);
1570 let mut amount_msat = 0;
1571 let mut receiver_node_id = None;
1572 let mut htlcs: Option<Vec<ClaimedHTLC>> = Some(vec![]);
1573 let mut sender_intended_total_msat: Option<u64> = None;
1574 read_tlv_fields!(reader, {
1575 (0, payment_hash, required),
1576 (1, receiver_node_id, option),
1577 (2, purpose, upgradable_required),
1578 (4, amount_msat, required),
1579 (5, htlcs, optional_vec),
1580 (7, sender_intended_total_msat, option),
1582 Ok(Some(Event::PaymentClaimed {
1585 purpose: _init_tlv_based_struct_field!(purpose, upgradable_required),
1587 htlcs: htlcs.unwrap_or(vec![]),
1588 sender_intended_total_msat,
1595 _init_and_read_len_prefixed_tlv_fields!(reader, {
1596 (0, payment_id, required),
1597 (2, payment_hash, required),
1598 (4, path, required_vec),
1599 (6, blinded_tail, option),
1601 Ok(Some(Event::ProbeSuccessful {
1602 payment_id: payment_id.0.unwrap(),
1603 payment_hash: payment_hash.0.unwrap(),
1604 path: Path { hops: path, blinded_tail },
1611 _init_and_read_len_prefixed_tlv_fields!(reader, {
1612 (0, payment_id, required),
1613 (2, payment_hash, required),
1614 (4, path, required_vec),
1615 (6, short_channel_id, option),
1616 (8, blinded_tail, option),
1618 Ok(Some(Event::ProbeFailed {
1619 payment_id: payment_id.0.unwrap(),
1620 payment_hash: payment_hash.0.unwrap(),
1621 path: Path { hops: path, blinded_tail },
1629 let mut prev_channel_id = ChannelId::new_zero();
1630 let mut failed_next_destination_opt = UpgradableRequired(None);
1631 read_tlv_fields!(reader, {
1632 (0, prev_channel_id, required),
1633 (2, failed_next_destination_opt, upgradable_required),
1635 Ok(Some(Event::HTLCHandlingFailed {
1637 failed_next_destination: _init_tlv_based_struct_field!(failed_next_destination_opt, upgradable_required),
1645 let mut channel_id = ChannelId::new_zero();
1646 let mut user_channel_id: u128 = 0;
1647 let mut counterparty_node_id = RequiredWrapper(None);
1648 let mut channel_type = RequiredWrapper(None);
1649 read_tlv_fields!(reader, {
1650 (0, channel_id, required),
1651 (2, user_channel_id, required),
1652 (4, counterparty_node_id, required),
1653 (6, channel_type, required),
1656 Ok(Some(Event::ChannelReady {
1659 counterparty_node_id: counterparty_node_id.0.unwrap(),
1660 channel_type: channel_type.0.unwrap()
1667 let mut channel_id = ChannelId::new_zero();
1668 let mut user_channel_id: u128 = 0;
1669 let mut former_temporary_channel_id = None;
1670 let mut counterparty_node_id = RequiredWrapper(None);
1671 let mut funding_txo = RequiredWrapper(None);
1672 let mut channel_type = None;
1673 read_tlv_fields!(reader, {
1674 (0, channel_id, required),
1675 (1, channel_type, option),
1676 (2, user_channel_id, required),
1677 (4, former_temporary_channel_id, required),
1678 (6, counterparty_node_id, required),
1679 (8, funding_txo, required),
1682 Ok(Some(Event::ChannelPending {
1685 former_temporary_channel_id,
1686 counterparty_node_id: counterparty_node_id.0.unwrap(),
1687 funding_txo: funding_txo.0.unwrap(),
1695 _init_and_read_len_prefixed_tlv_fields!(reader, {
1696 (0, payment_id, required),
1698 Ok(Some(Event::InvoiceRequestFailed {
1699 payment_id: payment_id.0.unwrap(),
1704 // Note that we do not write a length-prefixed TLV for ConnectionNeeded events.
1706 // Versions prior to 0.0.100 did not ignore odd types, instead returning InvalidValue.
1707 // Version 0.0.100 failed to properly ignore odd types, possibly resulting in corrupt
1709 x if x % 2 == 1 => {
1710 // If the event is of unknown type, assume it was written with `write_tlv_fields`,
1711 // which prefixes the whole thing with a length BigSize. Because the event is
1712 // odd-type unknown, we should treat it as `Ok(None)` even if it has some TLV
1713 // fields that are even. Thus, we avoid using `read_tlv_fields` and simply read
1714 // exactly the number of bytes specified, ignoring them entirely.
1715 let tlv_len: BigSize = Readable::read(reader)?;
1716 FixedLengthReader::new(reader, tlv_len.0)
1717 .eat_remaining().map_err(|_| msgs::DecodeError::ShortRead)?;
1720 _ => Err(msgs::DecodeError::InvalidValue)
1725 /// An event generated by ChannelManager which indicates a message should be sent to a peer (or
1726 /// broadcast to most peers).
1727 /// These events are handled by PeerManager::process_events if you are using a PeerManager.
1728 #[derive(Clone, Debug)]
1729 #[cfg_attr(test, derive(PartialEq))]
1730 pub enum MessageSendEvent {
1731 /// Used to indicate that we've accepted a channel open and should send the accept_channel
1732 /// message provided to the given peer.
1734 /// The node_id of the node which should receive this message
1736 /// The message which should be sent.
1737 msg: msgs::AcceptChannel,
1739 /// Used to indicate that we've accepted a V2 channel open and should send the accept_channel2
1740 /// message provided to the given peer.
1741 SendAcceptChannelV2 {
1742 /// The node_id of the node which should receive this message
1744 /// The message which should be sent.
1745 msg: msgs::AcceptChannelV2,
1747 /// Used to indicate that we've initiated a channel open and should send the open_channel
1748 /// message provided to the given peer.
1750 /// The node_id of the node which should receive this message
1752 /// The message which should be sent.
1753 msg: msgs::OpenChannel,
1755 /// Used to indicate that we've initiated a V2 channel open and should send the open_channel2
1756 /// message provided to the given peer.
1758 /// The node_id of the node which should receive this message
1760 /// The message which should be sent.
1761 msg: msgs::OpenChannelV2,
1763 /// Used to indicate that a funding_created message should be sent to the peer with the given node_id.
1764 SendFundingCreated {
1765 /// The node_id of the node which should receive this message
1767 /// The message which should be sent.
1768 msg: msgs::FundingCreated,
1770 /// Used to indicate that a funding_signed message should be sent to the peer with the given node_id.
1772 /// The node_id of the node which should receive this message
1774 /// The message which should be sent.
1775 msg: msgs::FundingSigned,
1777 /// Used to indicate that a stfu message should be sent to the peer with the given node id.
1779 /// The node_id of the node which should receive this message
1781 /// The message which should be sent.
1784 /// Used to indicate that a splice message should be sent to the peer with the given node id.
1786 /// The node_id of the node which should receive this message
1788 /// The message which should be sent.
1791 /// Used to indicate that a splice_ack message should be sent to the peer with the given node id.
1793 /// The node_id of the node which should receive this message
1795 /// The message which should be sent.
1796 msg: msgs::SpliceAck,
1798 /// Used to indicate that a splice_locked message should be sent to the peer with the given node id.
1800 /// The node_id of the node which should receive this message
1802 /// The message which should be sent.
1803 msg: msgs::SpliceLocked,
1805 /// Used to indicate that a tx_add_input message should be sent to the peer with the given node_id.
1807 /// The node_id of the node which should receive this message
1809 /// The message which should be sent.
1810 msg: msgs::TxAddInput,
1812 /// Used to indicate that a tx_add_output message should be sent to the peer with the given node_id.
1814 /// The node_id of the node which should receive this message
1816 /// The message which should be sent.
1817 msg: msgs::TxAddOutput,
1819 /// Used to indicate that a tx_remove_input message should be sent to the peer with the given node_id.
1821 /// The node_id of the node which should receive this message
1823 /// The message which should be sent.
1824 msg: msgs::TxRemoveInput,
1826 /// Used to indicate that a tx_remove_output message should be sent to the peer with the given node_id.
1827 SendTxRemoveOutput {
1828 /// The node_id of the node which should receive this message
1830 /// The message which should be sent.
1831 msg: msgs::TxRemoveOutput,
1833 /// Used to indicate that a tx_complete message should be sent to the peer with the given node_id.
1835 /// The node_id of the node which should receive this message
1837 /// The message which should be sent.
1838 msg: msgs::TxComplete,
1840 /// Used to indicate that a tx_signatures message should be sent to the peer with the given node_id.
1842 /// The node_id of the node which should receive this message
1844 /// The message which should be sent.
1845 msg: msgs::TxSignatures,
1847 /// Used to indicate that a tx_init_rbf message should be sent to the peer with the given node_id.
1849 /// The node_id of the node which should receive this message
1851 /// The message which should be sent.
1852 msg: msgs::TxInitRbf,
1854 /// Used to indicate that a tx_ack_rbf message should be sent to the peer with the given node_id.
1856 /// The node_id of the node which should receive this message
1858 /// The message which should be sent.
1859 msg: msgs::TxAckRbf,
1861 /// Used to indicate that a tx_abort message should be sent to the peer with the given node_id.
1863 /// The node_id of the node which should receive this message
1865 /// The message which should be sent.
1868 /// Used to indicate that a channel_ready message should be sent to the peer with the given node_id.
1870 /// The node_id of the node which should receive these message(s)
1872 /// The channel_ready message which should be sent.
1873 msg: msgs::ChannelReady,
1875 /// Used to indicate that an announcement_signatures message should be sent to the peer with the given node_id.
1876 SendAnnouncementSignatures {
1877 /// The node_id of the node which should receive these message(s)
1879 /// The announcement_signatures message which should be sent.
1880 msg: msgs::AnnouncementSignatures,
1882 /// Used to indicate that a series of HTLC update messages, as well as a commitment_signed
1883 /// message should be sent to the peer with the given node_id.
1885 /// The node_id of the node which should receive these message(s)
1887 /// The update messages which should be sent. ALL messages in the struct should be sent!
1888 updates: msgs::CommitmentUpdate,
1890 /// Used to indicate that a revoke_and_ack message should be sent to the peer with the given node_id.
1892 /// The node_id of the node which should receive this message
1894 /// The message which should be sent.
1895 msg: msgs::RevokeAndACK,
1897 /// Used to indicate that a closing_signed message should be sent to the peer with the given node_id.
1899 /// The node_id of the node which should receive this message
1901 /// The message which should be sent.
1902 msg: msgs::ClosingSigned,
1904 /// Used to indicate that a shutdown message should be sent to the peer with the given node_id.
1906 /// The node_id of the node which should receive this message
1908 /// The message which should be sent.
1909 msg: msgs::Shutdown,
1911 /// Used to indicate that a channel_reestablish message should be sent to the peer with the given node_id.
1912 SendChannelReestablish {
1913 /// The node_id of the node which should receive this message
1915 /// The message which should be sent.
1916 msg: msgs::ChannelReestablish,
1918 /// Used to send a channel_announcement and channel_update to a specific peer, likely on
1919 /// initial connection to ensure our peers know about our channels.
1920 SendChannelAnnouncement {
1921 /// The node_id of the node which should receive this message
1923 /// The channel_announcement which should be sent.
1924 msg: msgs::ChannelAnnouncement,
1925 /// The followup channel_update which should be sent.
1926 update_msg: msgs::ChannelUpdate,
1928 /// Used to indicate that a channel_announcement and channel_update should be broadcast to all
1929 /// peers (except the peer with node_id either msg.contents.node_id_1 or msg.contents.node_id_2).
1931 /// Note that after doing so, you very likely (unless you did so very recently) want to
1932 /// broadcast a node_announcement (e.g. via [`PeerManager::broadcast_node_announcement`]). This
1933 /// ensures that any nodes which see our channel_announcement also have a relevant
1934 /// node_announcement, including relevant feature flags which may be important for routing
1935 /// through or to us.
1937 /// [`PeerManager::broadcast_node_announcement`]: crate::ln::peer_handler::PeerManager::broadcast_node_announcement
1938 BroadcastChannelAnnouncement {
1939 /// The channel_announcement which should be sent.
1940 msg: msgs::ChannelAnnouncement,
1941 /// The followup channel_update which should be sent.
1942 update_msg: Option<msgs::ChannelUpdate>,
1944 /// Used to indicate that a channel_update should be broadcast to all peers.
1945 BroadcastChannelUpdate {
1946 /// The channel_update which should be sent.
1947 msg: msgs::ChannelUpdate,
1949 /// Used to indicate that a node_announcement should be broadcast to all peers.
1950 BroadcastNodeAnnouncement {
1951 /// The node_announcement which should be sent.
1952 msg: msgs::NodeAnnouncement,
1954 /// Used to indicate that a channel_update should be sent to a single peer.
1955 /// In contrast to [`Self::BroadcastChannelUpdate`], this is used when the channel is a
1956 /// private channel and we shouldn't be informing all of our peers of channel parameters.
1958 /// The node_id of the node which should receive this message
1960 /// The channel_update which should be sent.
1961 msg: msgs::ChannelUpdate,
1963 /// Broadcast an error downstream to be handled
1965 /// The node_id of the node which should receive this message
1967 /// The action which should be taken.
1968 action: msgs::ErrorAction
1970 /// Query a peer for channels with funding transaction UTXOs in a block range.
1971 SendChannelRangeQuery {
1972 /// The node_id of this message recipient
1974 /// The query_channel_range which should be sent.
1975 msg: msgs::QueryChannelRange,
1977 /// Request routing gossip messages from a peer for a list of channels identified by
1978 /// their short_channel_ids.
1980 /// The node_id of this message recipient
1982 /// The query_short_channel_ids which should be sent.
1983 msg: msgs::QueryShortChannelIds,
1985 /// Sends a reply to a channel range query. This may be one of several SendReplyChannelRange events
1986 /// emitted during processing of the query.
1987 SendReplyChannelRange {
1988 /// The node_id of this message recipient
1990 /// The reply_channel_range which should be sent.
1991 msg: msgs::ReplyChannelRange,
1993 /// Sends a timestamp filter for inbound gossip. This should be sent on each new connection to
1994 /// enable receiving gossip messages from the peer.
1995 SendGossipTimestampFilter {
1996 /// The node_id of this message recipient
1998 /// The gossip_timestamp_filter which should be sent.
1999 msg: msgs::GossipTimestampFilter,
2003 /// A trait indicating an object may generate message send events
2004 pub trait MessageSendEventsProvider {
2005 /// Gets the list of pending events which were generated by previous actions, clearing the list
2007 fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent>;
2010 /// A trait indicating an object may generate events.
2012 /// Events are processed by passing an [`EventHandler`] to [`process_pending_events`].
2014 /// Implementations of this trait may also feature an async version of event handling, as shown with
2015 /// [`ChannelManager::process_pending_events_async`] and
2016 /// [`ChainMonitor::process_pending_events_async`].
2020 /// When using this trait, [`process_pending_events`] will call [`handle_event`] for each pending
2021 /// event since the last invocation.
2023 /// In order to ensure no [`Event`]s are lost, implementors of this trait will persist [`Event`]s
2024 /// and replay any unhandled events on startup. An [`Event`] is considered handled when
2025 /// [`process_pending_events`] returns, thus handlers MUST fully handle [`Event`]s and persist any
2026 /// relevant changes to disk *before* returning.
2028 /// Further, because an application may crash between an [`Event`] being handled and the
2029 /// implementor of this trait being re-serialized, [`Event`] handling must be idempotent - in
2030 /// effect, [`Event`]s may be replayed.
2032 /// Note, handlers may call back into the provider and thus deadlocking must be avoided. Be sure to
2033 /// consult the provider's documentation on the implication of processing events and how a handler
2034 /// may safely use the provider (e.g., see [`ChannelManager::process_pending_events`] and
2035 /// [`ChainMonitor::process_pending_events`]).
2037 /// (C-not implementable) As there is likely no reason for a user to implement this trait on their
2040 /// [`process_pending_events`]: Self::process_pending_events
2041 /// [`handle_event`]: EventHandler::handle_event
2042 /// [`ChannelManager::process_pending_events`]: crate::ln::channelmanager::ChannelManager#method.process_pending_events
2043 /// [`ChainMonitor::process_pending_events`]: crate::chain::chainmonitor::ChainMonitor#method.process_pending_events
2044 /// [`ChannelManager::process_pending_events_async`]: crate::ln::channelmanager::ChannelManager::process_pending_events_async
2045 /// [`ChainMonitor::process_pending_events_async`]: crate::chain::chainmonitor::ChainMonitor::process_pending_events_async
2046 pub trait EventsProvider {
2047 /// Processes any events generated since the last call using the given event handler.
2049 /// See the trait-level documentation for requirements.
2050 fn process_pending_events<H: Deref>(&self, handler: H) where H::Target: EventHandler;
2053 /// A trait implemented for objects handling events from [`EventsProvider`].
2055 /// An async variation also exists for implementations of [`EventsProvider`] that support async
2056 /// event handling. The async event handler should satisfy the generic bounds: `F:
2057 /// core::future::Future, H: Fn(Event) -> F`.
2058 pub trait EventHandler {
2059 /// Handles the given [`Event`].
2061 /// See [`EventsProvider`] for details that must be considered when implementing this method.
2062 fn handle_event(&self, event: Event);
2065 impl<F> EventHandler for F where F: Fn(Event) {
2066 fn handle_event(&self, event: Event) {
2071 impl<T: EventHandler> EventHandler for Arc<T> {
2072 fn handle_event(&self, event: Event) {
2073 self.deref().handle_event(event)