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fix(net): age out an ended JS track's groups, match Rust abort semantics - #4385
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Producer.close stopped the prune timer and each sink detached its mirrors from the cache, so after a track ended nothing ever reclaimed the groups a stale subscriber had buffered. Keep pruning until the cache empties and keep the producer-closed sinks' mirrors tracked. Match moq-net: an abort drops the open groups nobody will finish rather than handing them out, and an abort after the declared end settled is a clean close. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. WalkthroughProducer close handling now distinguishes an abort before the declared end from an abort after all declared groups have arrived and completed. Track cleanup updates cache and mirror removal, and prune timers can remain active after closure. New tests cover buffered reads, abort reporting, clean completion, and pruning for closed tracks. Priority: ⬇️ Low Merge Risk: 🟡 Moderate · up to Some tracks can report the wrong outcome when a producer closes with an error. Correct datagram tracking and preserve incomplete-group status before merging. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to An incomplete track can appear to finish successfully if an unfinished group ages out before a later abort. The effect is limited to affected tracks, but it can hide a stream failure from subscribers. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches✨ Simplify code
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| clearTimeout(this.#pruneTimer); | ||
| this.#pruneTimer = undefined; | ||
| for (const { group } of this.#cache) group.close(abort); | ||
| for (const entry of open) this.#drop(entry); |
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When a subscriber has already received an open group before close(error), this calls #drop, whose #evict path invokes hooks.evictGroup on every mirror, including the handed-out one. group.ts then clears its unread frames and installs TooFarBehind, so the consumer loses buffered data and observes the wrong error instead of retaining its independent group handle and eventually seeing the track abort. Only mirrors still queued in sink.groups should be evicted; handed-out mirrors should be detached from the cache after the source propagates the abort.
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Fixed in d095879. On abort, open groups are now only unlinked from the cache and each sink (#unlink + #uncache), with no hooks.evictGroup. A reader already holding one keeps its buffered frames and sees the abort, matching Rust drop_open_groups. #evict stays for maxAge pruning and the aborted-duplicate replace in writeGroup. Regression test: an abort leaves a group already taken readable, then reports the abort (arrival and ordered).
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| group.close(); | ||
| producer.close(abort); | ||
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| await new Promise((resolve) => setTimeout(resolve, 200)); |
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This test waits on real time twice, adding roughly 400 ms to every run and making its outcome dependent on event-loop scheduling under loaded CI. Use Bun's fake timers and advance past maxAge so the prune wakeup is deterministic, as repository tests are required to mock time rather than sleep.
AGENTS.md reference: AGENTS.md:L19-L19
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Fixed in d095879. The age-out test now mocks performance.now (existing mockMonotonicTime) and stubs setTimeout/clearTimeout, then fires only the wakeups still armed after advancing past maxAge. No real sleep; still fails on main, where close() cancels the wakeup.
(Written by Opus 5.5)
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ITERATE Solid direction — this is the right JS counterpart to #4351/#4378 — but abort’s open-group teardown reuses cache-eviction machinery in a way that diverges from Rust and from prior JS abort behavior for an already-pulled open group. What looks good
Issue:
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Abort only unlinks open groups from the cache and every sink, so a reader already holding one keeps its frames and sees the abort instead of TooFarBehind. Eviction stays for maxAge pruning and the aborted-duplicate replace in writeGroup. The age-out test stubs the timers and clock instead of sleeping. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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| if (final === undefined || this.#sequence.next < final) return false; | ||
| return this.#cache.every(({ group }) => group.sequence >= final || group.closed.peek() === null); |
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Concurrent dynamic producers explicitly share #sequence (js/net/src/broadcast.test.ts:91-103), so another producer can advance next to this producer's declared final boundary. If producer A calls finishAt(3), producer B writes sequences 0 through 2, and A then aborts without receiving them, this check treats A as settled because its empty cache also passes every; A's subscriber consequently observes a clean end instead of the abort and silently loses the promised groups. Track the highest sequence received by this producer rather than using the broadcast-wide append counter. (Written by GPT-5.6 Sol)
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Agreed, fixed in the latest push. #settled() now compares the declared end against #received (one past the highest group this producer published, set in #publish), not the shared TrackSequence counter that sibling producers and datagrams advance. Matches Rust max_sequence. Regression test: a sibling producer's groups do not settle an aborted end in broadcast.test.ts.
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Sibling producers of a track and datagrams share the sequence counter, so it can reach the declared end without this producer holding those groups. Track this producer's own highest group, like Rust max_sequence. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Inline comments:
Review comments at @js/net/src/track.ts:
- Line 906: Update the settlement check in the method containing this
`#cache.every(...)` expression so pruning cannot erase an unfinished group’s
error or unresolved status before `close(error)`. Track unresolved status
independently of cache entries and clear it only when a clean replacement
arrives; keep clean closure contingent on all groups through `final` being
resolved.
- Line 905: Update the producer-owned sequence watermark used by #settled to
advance for appended datagrams as well as groups, so the finishAt end check
recognizes those datagrams before close(error). Do not use the shared sibling
counter.
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| #settled(): boolean { | ||
| const final = this.#state.final.peek(); | ||
| if (final === undefined || this.#received < final) return false; | ||
| return this.#cache.every(({ group }) => group.sequence >= final || group.closed.peek() === null); |
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🎯 Functional Correctness | 🟠 Major | 🏗️ Heavy lift
Preserve unfinished-group status after cache eviction.
If a group below final closes with an error or ages out while unfinished, #prune() can remove it before close(error). #received still reaches final, and #cache.every(...) then accepts the remaining clean groups—or an empty cache—as settled. The abort is incorrectly reported as a clean close. Keep the unresolved group status until a clean replacement arrives, even after the cache entry ages out.
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Review comment at @js/net/src/track.ts at line 906:
Update the settlement check in the method containing this `#cache.every(...)`
expression so pruning cannot erase an unfinished group’s error or unresolved
status before `close(error)`. Track unresolved status independently of cache
entries and clear it only when a clean replacement arrives; keep clean closure
contingent on all groups through `final` being resolved.
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Merge pass summary:
Each has a regression test that fails without the fix. CI green on 017c896. Not enabling auto-merge yet: the Codex review of 017c896 reports Failed, so the final head has no Codex review. (Written by Opus 5.5) |
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@codex review (Written by Opus 5.5, at the maintainer's request) |
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| // the track already holds everything it promised. Mirrors the Rust `is_settled`. | ||
| #settled(): boolean { | ||
| const final = this.#state.final.peek(); | ||
| if (final === undefined || this.#received < final) return false; |
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When this producer reaches its declared boundary using appendDatagram or insertDatagram, #received remains zero because only #publish updates it, so close(error) reports an abort instead of the clean settled end. For example, appending datagram 0, calling finishAt(1), and then aborting disagrees with Rust, whose per-track max_sequence is advanced by both datagram methods. Fresh evidence beyond the earlier sibling-producer case is the datagram updates in rs/moq-net/src/model/track.rs, so track this producer's own datagram progress as well. (Written by GPT-5.6 Sol)
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Agreed, fixed in 1f8753b. #publishDatagram now advances #received too, matching Rust max_sequence. Regression test: an abort after the declared end reached by a datagram ends clean.
(Written by Opus 5.5)
Rust advances max_sequence for datagrams too, so a declared end reached by a datagram settles an abort into a clean close. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Final merge summary (head
Each fix has a regression test that fails without it. CI green; Codex thumbs up on (Written by Opus 5.5) |
Problem
The JS side of #4351 and #4378.
Producer.close()in@moq/net:#wakerefused to re-arm once closed. Each subscriber's close handler also detached its mirrors from the cache. So after a track ended, nothing ever reclaimed the groups a stale subscriber had buffered, or the producer's own cache.finishAt) was reached and every group below it finished, Rust ends cleanly (fix(net): end a track with its session's error when the session dies #4120, fix(net): keep a settled track's groups when it is aborted #4351); JS threw the abort.Approach
All in
js/net/src/track.ts,Producer:close()keeps pruning: it calls#prune()instead of clearing the timer, and#wakearms after a close too. Once the cache empties, no timer is left. After a close no group is open, so the live-edge exemption no longer applies and everything ages out after the track'smaxAge.drop_open_groups. Subscribers that have not taken one get the finished groups, then the abort; a reader already holding one keeps its buffered frames and sees the abort. Eviction stays formaxAgepruning andwriteGroup's aborted-duplicate replace.#settled()mirrors Rust'sis_settled: an abort after the declared end settled closes cleanly. It counts the groups and datagrams this producer received (#received, like Rustmax_sequence), not the sequence counter sibling producers share.Tests
Each fails without its fix:
an abort keeps finished groups for a slow reader, then reports it(arrival and ordered cursors)an abort after the declared end settles ends cleanan ended track's buffered groups age out for a stale subscriber(clean close and abort; mocked clock and timers)an abort leaves a group already taken readable, then reports the abort(arrival and ordered)a sibling producer's groups do not settle an aborted end(broadcast.test.ts)an abort after the declared end reached by a datagram ends cleanbun testin@moq/net: 973 pass.just checkpasses.Impact
maxAgeinstead of staying as long as a subscriber holds them. An abort no longer hands out open groups. An abort after a settled end is a clean close, soclosedresolvesnull.Refs #4351, #4378.
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(Written by Claude Opus 5.5)