fix(net): end a track with its session's error when the session dies - #4120
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 0 remain after this review. WalkthroughRust and JavaScript subscriber paths now propagate session and stream errors to affected tracks. Rust track and resume state retain terminal segment errors and distinguish settled track ends from incomplete ends after abort. The changes add tests for session termination, stream resets, incomplete final-group delivery, and clean completion. The session-death quest entry and document were removed. Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: 🔵 Low · up to A concurrent close may still let the test transport queue data after closure, so the affected tests warrant owner attention. The FIN-acknowledgement issue no longer appears to block merging. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to These changes improve how interrupted tracks report errors, but they affect a shared delivery contract across several protocol implementations. The inspected termination paths show no confirmed new security weakness; coverage of all paths remains incomplete. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
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✨ Finishing Touches 💡 1✨ Simplify code
🛠️ Fix failing CI checks 💡
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| } finally { | ||
| // The session died under every track it was receiving, so they end with its | ||
| // error. A deliberate close() already ended them cleanly, which makes this a no-op. | ||
| this.#subscriber.close(fatal ?? (await closeError(this.#quic))); |
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When the session stream or an incoming-stream accept loop is the first task to reject during shutdown, fatal is the raw WebTransportError with source === "session". Passing it directly here closes every active track with that transport error, and the first close wins before the per-subscription sessionCause() path can replace it with the peer's coded SessionError. Normalize a session-sourced fatal through sessionCause or closeError before the bulk close.
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Agreed. A fatal task that is the session close now goes through sessionCause before the bulk close, so those tracks get the peer's Session error instead of the raw transport error.
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| console.debug(`subscribe close: id=${id} broadcast=${broadcast} track=${request.name}`); | ||
| } catch (err) { | ||
| const e = error(err); | ||
| const e = await sessionCause(this.#quic, err); |
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If the session dies before setup receives TRACK_INFO or SUBSCRIBE_OK, execution never reaches this new sessionCause() call: the earlier setup catch still uses error(err) and rejects the request with the raw session-sourced transport error. The same gap exists in the IETF subscriber's pre-SUBSCRIBE_OK catch, so tracks awaiting acceptance lose the peer close code while already-established tracks receive SessionError; apply the translation in both setup catches as well.
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Agreed. The lite and IETF setup catches use sessionCause too, so a subscribe that dies before it is accepted rejects with the session's close. A timeout is still a control timeout.
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| } catch (err) { | ||
| // A control request that timed out is not late content, so it carries its own code. | ||
| const e = err instanceof TimeoutError ? controlTimeout(err) : error(err); | ||
| const e = err instanceof TimeoutError ? controlTimeout(err) : await sessionCause(this.#quic, err); |
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On IETF drafts 14–16, if the control adapter closes while nextRequestId() is blocked by MAX_REQUEST_ID, or before a subscription begins, it resolves undefined and the earlier branch rejects the track with a generic Error("session closed"). That branch never reaches this new sessionCause() translation, so the awaiting subscriber still loses the peer's coded SessionError; use the transport's close error for that early exit too. (Written by GPT-5.6 Sol)
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Agreed. When nextRequestId returns undefined, the rejection is the transport's close if that close has already landed. A still-open transport, such as a GOAWAY drain, is not waited out.
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| if self.closed && !pending_activation { | ||
| return match ready!(self.poll_final(waiter)) { | ||
| Some(_) => Poll::Ready(Ok(None)), | ||
| Some(end) => Poll::Ready(end.map(|_| None)), |
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When the logical producer has called finish() but its final segment is subsequently aborted, a datagram-only subscriber still returns Ok(None): the inner poll_recv_datagram error is discarded by the Ok(Some(...)) pattern, then the earlier self.finished branch exits before this new error-preserving path. This reproduces the same session-death masking fixed for group readers, so the finished path should also end according to the final segment.
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Agreed. A finished producer was ending datagram reads with Ok(None) because poll_recv_datagram drops Ready(Err). That path now asks the final segment, same as groups, and a datagram-only test covers a segment that dies after finish.
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Inline comments:
In `@js/net/src/ietf/adapter.ts`:
- Around line 260-263: Update ControlStreamAdapter.run so unexpected
control-stream EOF rejects with a ProtocolViolation instead of storing it as a
local cause and resolving; propagate the error to Connection’s rejection handler
so it can close the session.
In `@rs/moq-net/tests/support/mock.rs`:
- Around line 145-147: Update the FIN handling around `StreamChunk::Fin` so the
`ack_fin` branch records `Ok(())` only after `push` succeeds. Propagate the push
error and leave `closed` unacknowledged when delivery fails, so `poll_closed`
can report the connection error.
- Around line 122-127: Update MockSession::push to hold the connection-state
lock from checking self.conn.error() through tx.try_push, so close and queue
insertion are ordered atomically; preserve the existing closed error behavior.
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📒 Files selected for processing (20)
js/net/src/error.tsjs/net/src/ietf/adapter.tsjs/net/src/ietf/connection.tsjs/net/src/ietf/publisher.test.tsjs/net/src/ietf/subscriber.tsjs/net/src/integration.test.tsjs/net/src/lite/connection.tsjs/net/src/lite/subscriber.tsjs/net/src/mock.tsquest/m1/README.mdquest/m1/session-death-error.mdrs/moq-net/src/ietf/session.rsrs/moq-net/src/ietf/subscriber.rsrs/moq-net/src/lite/session.rsrs/moq-net/src/lite/subscriber.rsrs/moq-net/src/model/resume.rsrs/moq-net/src/model/track.rsrs/moq-net/tests/subscription_end_integrity.rsrs/moq-net/tests/support/mock.rsrs/moq-tokio/tests/subscription_end_integrity.rs
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- quest/m1/README.md
- quest/m1/session-death-error.md
Files not reviewed due to moderation or processing errors (4)
- rs/moq-net/src/model/resume.rs
- rs/moq-net/src/model/track.rs
- rs/moq-net/src/ietf/session.rs
- rs/moq-net/src/ietf/subscriber.rs
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Landing on main. A dying session ends its tracks with that session's error in Rust and JS, not Rebased onto current main. The finished quest doc is gone, including the track-tail link that was failing Check. A finished resume track's datagram read now keeps a dead final segment's error, and a held mock FIN is acknowledged only if it was queued. (Written by Grok 4.7) |
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| fn abort(&self, err: &Error) { | ||
| for (_, entry) in self.0.lock().drain() { | ||
| let _ = entry.producer.abort(Error::Cancel); | ||
| let _ = entry.producer.abort(err.clone()); | ||
| } |
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When a lite-05+ session closes while TrackServeRun is still waiting for TRACK_INFO, the request has not reached prepare_establish, so this map contains no TrackEntry to abort. SubscriberDriver::poll observes the failed uni accept before polling sources, returns from the driver, and dropping the pending track::Request rejects it with Error::Dropped rather than the session error. The IETF pre-SUBSCRIBE_OK path has the same gap because State::abort skips entries whose producer is still None. Preserve and reject pending requests with err, or let those setup machines observe the close before canceling them.
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Agreed. A lite track still waiting on TRACK_INFO is not in the subscribe map, and an IETF subscribe has no producer until SUBSCRIBE_OK, so dropping that setup ended the track as Dropped. The session error is recorded and the parked request is rejected with it.
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A subscription cut off by its session closing concludes `Ok(None)`, as if the track had ended after the last group the subscriber pulled, when the draft says a subscription ends by the publisher's FIN only once every group is accounted for, and by a reset when the serving session ends. Two tests, each with a passing control that keeps the session alive: - moq-net, mock transport, deterministic: SUBSCRIBE_END and the final group's first frame reach the subscriber, the rest never leaves, the session closes, and the subscriber reads on to `Ok(None)` with the head group alone. The final group, first frame included, is skipped. - moq-tokio, real QUIC: the same over a CONNECTION_CLOSE with a 4 MB final group still behind the flow-control window: 10/20 frames and `Ok(None)`. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
#4148 renamed that ALPN and took it off the default set. The session-death cases still run on that draft. Co-Authored-By: Grok 4.7 <noreply@x.ai>
A fatal lite task and a subscribe that dies before it is accepted were still the raw transport error. sessionCause already turns a session-sourced failure into the peer's close. Co-Authored-By: Grok 4.7 <noreply@x.ai>
nextRequestId resolves undefined once the adapter is gone, before sessionCause runs. If the transport has already closed, that close is the rejection. A still-open transport is not waited out. Co-Authored-By: Grok 4.7 <noreply@x.ai>
#4116 added those fields. The session-death tests only drive the sessions. Co-Authored-By: Grok 4.7 <noreply@x.ai>
A finished resume producer ended datagram reads cleanly because that poll drops Ready(Err). Ask the final segment, the same way groups do. Acknowledge a held mock FIN only when it was queued, so poll_closed still reports the connection error. Co-Authored-By: Grok 4.7 <noreply@x.ai>
A lite track waiting on TRACK_INFO is not in the subscribe map, and an IETF subscribe has no producer until SUBSCRIBE_OK. Dropping either was Dropped. Record the session error and reject the parked request with it. Co-Authored-By: Grok 4.7 <noreply@x.ai>
Main now hands the mock session a origin consumer, not the producer. Co-Authored-By: Grok 4.7 <noreply@x.ai>
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| return match ready!(self.poll_final(waiter)) { | ||
| Some(end) => Poll::Ready(end.map(|_| None)), | ||
| None => Poll::Ready(Ok(None)), |
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When the wire segment has already received finish_at/SUBSCRIBE_END and its session then dies, sub.poll_recv_datagram returns the session error, but this fallback cannot recover it: poll_final calls TrackState::poll_finished, which returns Ok(final_sequence) before checking abort (track.rs lines 1133-1137), so a datagram-only reader still ends with Ok(None). Fresh evidence beyond the earlier resolved comment is that the new fallback consults the declared-end API rather than preserving the error returned by the datagram poll; return that error directly.
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Problem
When a session died, the tracks it was receiving did not end with the session's error:
Error::Dropped, and the driver's cleanup aborted what remained withError::Cancel. Through the origin, a relayed track then ended withDroppedfrom the resume layer.Error::Cancelon drop.Ok(None)with a group in its range never delivered #4061: once SUBSCRIBE_END declared the end, a session that died with a group below it still in flight ended the trackOk(None), skipping that group. The origin also finished the logical track as soon as the boundary was reached, and the resume layer then ignored the final segment's abort.Subscriber.close()closed every track cleanly, even after the session died. On lite-05+,#drainResponsesturned a reset of the subscribe stream into a clean end, so the outcome depended on which of two promises settled first.Approach
Rust (
moq-net):Error::from_transportof the close instead ofDropped. When the driver ends with an error, it aborts the remaining subscriptions with that error. Dropping the driver without an error still aborts withCancel.Dropimpl keepsCancelfor a dropped driver.track.rs): a declared end only stands if it had settled before an abort. At abort time the track records whether the end was reached and every cached group below it had finished. If not, the abort wins overis_complete.resume.rs):SubState::Donenow carries the segment'sResult. Once the logical track is finished, or its producer is gone, it ends the way its final segment's track ended, error included, instead ofOk(None)orDropped.MockErrornow reports a stream reset only throughstream_error. Before, a reset of 1 (Cancel) decoded asSession(Internal). Nothing written after the connection closes is delivered, and once an unfinished stream's earlier data is read, it fails with the close. The mock still guarantees that data FIN'd before the close is readable.JS (
@moq/net):Connection: when the session dies, it closes the subscriber with the error (the fatal task error, or the session's close as aSessionerror even for code 0). A deliberateclose()still closes tracks cleanly.#drainResponses: rejects on a reset. The rejection is pre-handled so a late reset cannot become unhandled.run()closes the virtual streams with the control stream's failure (aProtocolViolationon FIN). A GOAWAY and a deliberate close still close them cleanly.source === "session") is reported as the session's own close error, carrying the peer's code (sessionCause,closeError, both internal).Tests:
rs/moq-net/tests/subscription_end_integrity.rsandrs/moq-tokio/tests/subscription_end_integrity.rs: @kidq330's subscription concludesOk(None)with a group in its range never delivered #4061 repro, cherry-picked with authorship kept, with the controls. The mock arm and the real-QUIC arm both pass now.a_session_death_ends_the_track_with_its_erroraborts the publisher's session withApp(7)mid-group. It asserts the reader getsSession(App(7))on lite-03/05/07 and IETF 14/17/22.abort_before_the_end_settles_winsandabort_after_the_end_settles_ends_cleanintrack.rs, andfinished_producer_ends_with_a_dead_final_segmentinresume.rs. Two existing resume tests now expect the segment's error instead ofDropped.Session(71). All four fail without the fix. The lite-05 publisher-reset test also passes without the fix, because#runSubscriptionUpdateswatches the same stream and happened to win the race. It pins the behavior, but it is not a regression test.Impact
Error::Session(..)/Error::Transport(..)) instead ofDroppedorCancel. Aresumetrack that finished or was orphaned ends with its final segment's error instead ofOk(None)/Dropped. Atrack::Produceraborted before its declared end settled reads as aborted, not finished.Sessionerror carrying the peer's close code instead of closing cleanly.Alternatives
Ok(None)with a group in its range never delivered #4061 is fixed: deferring lite'sfinish_atfrom SUBSCRIBE_END to the subscribe stream's FIN would also gate the clean end, but readers would lose the early boundary, and fix(net): deliver a Rust track's tail up to its declared end #4116 builds on it. A settled end that wakes when each group finishes would need a group-to-track notification on every group close. Deciding at abort time keeps the hot path untouched.Cancel/Dropped). JS keeps its clean close.Follow-ups
finish_ata clean end, which must not mask the abort rule here. Whichever lands second needs to reconcile them.just test interop --all: see the comment below.Closes #4061
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