Ignore late failures for successful payments - #1065
Merged
Merged
Conversation
|
I've assigned @tnull as a reviewer! |
joostjager
reviewed
Aug 20, 2026
Comment on lines
1457
to
1501
| }; | ||
| }, | ||
| LdkEvent::PaymentFailed { payment_id, payment_hash, reason, .. } => { | ||
| log_info!( | ||
| self.logger, | ||
| "Failed to send payment with ID {} due to {:?}.", | ||
| payment_id, | ||
| reason | ||
| ); | ||
|
|
||
| let update = PaymentDetailsUpdate { | ||
| hash: Some(payment_hash), | ||
| status: Some(PaymentStatus::Failed), | ||
| ..PaymentDetailsUpdate::new(payment_id) | ||
| }; | ||
| match self.payment_store.update(update).await { | ||
| Ok(_) => {}, | ||
| Err(e) => { | ||
| log_error!(self.logger, "Failed to access payment store: {}", e); | ||
| return Err(ReplayEvent()); | ||
| }, | ||
| }; | ||
|
|
||
| // LDK may emit `PaymentFailed` after `PaymentSent` in exceedingly rare cases. | ||
| // The payment-store update above preserves success in that case; re-read the | ||
| // resulting state so we also avoid surfacing a contradictory public event. | ||
| match self.payment_store.get(&payment_id).await { | ||
| Ok(Some(payment)) if payment.status == PaymentStatus::Succeeded => { | ||
| log_info!( | ||
| self.logger, | ||
| "Ignoring late payment failure for already-succeeded payment with ID {}.", | ||
| payment_id | ||
| ); | ||
| return Ok(()); | ||
| }, | ||
| Ok(_) => {}, | ||
| Err(e) => { | ||
| log_error!(self.logger, "Failed to access payment store: {}", e); | ||
| return Err(ReplayEvent()); | ||
| }, | ||
| } | ||
|
|
||
| log_info!( | ||
| self.logger, | ||
| "Failed to send payment with ID {} due to {:?}.", | ||
| payment_id, | ||
| reason | ||
| ); | ||
|
|
||
| let event = Event::PaymentFailed { payment_id, payment_hash, reason }; | ||
| match self.event_queue.add_event(event).await { | ||
| Ok(_) => return Ok(()), |
Contributor
There was a problem hiding this comment.
This is again related to the split-brain situation with persistence, but can the initial payment store write fail after LDK accepts the payment? PaymentSent then accepts Ok(NotFound) and emits success, so a replayed late failure could escape this check after restart.
tnull
reviewed
Sep 18, 2026
thesimplekid
force-pushed
the
late_failures
branch
from
September 18, 2026 11:48
4df77f4 to
8cf15f2
Compare
tnull
reviewed
Sep 18, 2026
tnull
reviewed
Sep 21, 2026
tnull
left a comment
tnull
left a comment
Collaborator
There was a problem hiding this comment.
Please squash, one minor comment though.
thesimplekid
force-pushed
the
late_failures
branch
from
September 22, 2026 12:30
1accb18 to
73dc6c4
Compare
Ignore PaymentFailed when an outbound Lightning payment has already succeeded. Check and update the record atomically, preserving its metadata and suppressing the contradictory failure notification. Continue emitting failure events for unchanged or missing records so replay can recover from event-queue persistence failures. Developed with assistance from OpenAI Codex.
thesimplekid
force-pushed
the
late_failures
branch
from
September 22, 2026 12:44
73dc6c4 to
1bb6aa3
Compare
Contributor
Author
|
Sorry, squashed into 1 commit now when you said prefactor commit I thought you wanted that one on its own. |
Collaborator
Ah, indeed. Just skimmed the history and saw the |
tnull
approved these changes
Sep 22, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
4 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
rust-lightning documents that PaymentFailed can arrive after PaymentSent in rare cases. In that ordering, the failure must be ignored and the payment must be treated as successful:
https://github.com/lightningdevkit/rust-lightning/blob/9174965af9437196c527a9aa0df36bbcf050c8bb/lightning/src/events/mod.rs#L1230-L1233
Keep succeeded outbound Lightning records monotonic and suppress the contradictory user-facing PaymentFailed event. Cover both BOLT11 and BOLT12 on the persistence-backed store path.
Developed with assistance from OpenAI Codex.