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feat(lite)!: restore SUBSCRIBE_DROP on unpublished lite-07 - #5983
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Co-Authored-By: GPT-6.1-Sol <noreply@openai.com>
Co-Authored-By: GPT-6.1-Sol <noreply@openai.com>
Co-Authored-By: GPT-6.1-Sol <noreply@openai.com>
Co-Authored-By: GPT-6.1-Sol <noreply@openai.com>
Co-Authored-By: GPT-6.1-Sol <noreply@openai.com>
kixelated
changed the title
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Checkpoint 683b1ac preserves the settled lite-07 framing, tail accounting, failed-send reporting, bounded-by-in-flight DROP backlog, regression, and Nightly benchmark. The quest stays open for DROP error interpretation and cut/resume persistence. Final JS net tests: 2,131 passed. The required just check reached 6,029 passing native tests, then failed the impaired transport-peer relay drill with seed 11851312523416585408; an isolated run with that seed passed, so the full gate remains unresolved. Draft/quest validation and Nightly wiring checks passed. Full cross-language interop is pending with the batch coordinator. Next: settle the error contract, then use /quest-iterate for the remaining behavior and gates. (written by GPT-6.1-Sol) |
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The lite-07 framing and accounting land here, completing subscribe-drop. The reader error contract, cut persistence, and recovery precedence move to subscribe-drop-errors, which now gates lite-07 finalization in its place. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
WalkthroughThe change removes stream counts from Priority: ➖ Normal Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 75.44% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 57 functions across 15 files. (16 skipped… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Title check The title clearly identifies the main change: restoring SUBSCRIBE_DROP for unpublished lite-07 and removing the prior stream-count behavior. Description check The description directly explains the problem, implementation, protocol and API changes, validation, and follow-up work described by the changeset. Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 75.44% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 57 functions across 15 files. (16 skipped: 16 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> # Conflicts: # js/justfile # js/net/MIGRATE.md # rs/moq-net/MIGRATE.md # rs/moq-net/src/lite/publisher.rs
The publisher swallowed a rejected close, so a group stream that failed before delivery was acknowledged queued no SUBSCRIBE_DROP, unlike Rust. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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The JS publisher's end sweep only knew about group streams, so it sent SUBSCRIBE_DROP for datagrams it had already sent and a subscriber could settle before they arrived. Groups and datagrams now share one served set, as in Rust. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> # Conflicts: # js/net/MIGRATE.md
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Actionable comments posted: 1
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Inline comments:
Review comments at @js/net/src/lite/publisher.ts:
- Around line 1251-1258: Update the JS subscriber’s hooks.dropTrackGroups path
so cached groups whose sequence enters DROP after a post-FIN stream.closed
failure settle their reader with the defined SubscribeDrop error. Ensure
recvGroup() cannot return the cached group as a clean delivery or silently skip
it, while preserving the existing cached-group suppression condition.
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📒 Files selected for processing: 35
doc/concept/moq-lite.mddrafts/draft-lcurley-moq-lite.mdjs/justfilejs/net/MIGRATE.mdjs/net/bench/subscribe-drop.tsjs/net/src/lite/publisher.test.tsjs/net/src/lite/publisher.tsjs/net/src/lite/subscribe.test.tsjs/net/src/lite/subscribe.tsjs/net/src/lite/subscriber.test.tsjs/net/src/lite/subscriber.tsjs/net/src/lite/tail.test.tsjs/net/src/lite/version.tsquest/m1/README.mdquest/m1/close-tail-drain.mdquest/m1/drop-set.mdquest/m1/egress-held-state.mdquest/m1/lite07-finalize.mdquest/m1/quic/group-reset.mdquest/m1/resume-reorder.mdquest/m1/subscribe-drop-errors.mdquest/m1/subscribe-drop.mdquest/m1/subscribe-ranges/README.mdquest/m1/subscribe-ranges/dynamic.mdquest/m1/subscribe-ranges/lite.mdquest/m1/test-flakes-2/README.mdquest/m2/ordered-owed-wait.mdrs/moq-net/MIGRATE.mdrs/moq-net/src/lite/publisher.rsrs/moq-net/src/lite/subscribe.rsrs/moq-net/src/lite/subscriber.rsrs/moq-net/src/lite/version.rsrs/moq-net/tests/integration/track_tail.rssh/gh/nightly.shtest/interop/interop.sh
💤 Files with no reviewable changes: 4
- js/net/src/lite/version.ts
- quest/m1/subscribe-drop.md
- quest/m1/subscribe-ranges/lite.md
- quest/m1/quic/group-reset.md
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Problem
Unpublished lite-07 replaced SUBSCRIBE_DROP with a stream count, leaving skipped sequences and failed group sends without an explicit disposition.
Approach
Restore SUBSCRIBE_DROP and remove Stream Count on lite-07. Rust and JS use range-based tail accounting, declare the end while lower groups are in flight, and report failed sends through the response stream. Add lite-07 to relay tail interop.
DROP writes backpressure new group opens. The queue retains at most failures from the tasks already in flight when the writer stalls; the existing in-flight set has no fixed group-count cap. A regression holds eight failures behind a blocked response and proves 64 later groups remain unopened until it drains. A failed-group benchmark sweeps publishers and subscribers independently and runs in Nightly.
A JS group stream that fails after its FIN, before delivery is acknowledged, is also dropped, matching Rust (Codex review). The JS end sweep also counts sent datagrams, sharing one served set with group streams as Rust does, so it no longer drops a datagram it already sent (Codex review; this predates the PR on lite-05/06).
This completes
quest/m1/subscribe-drop.md, so it is deleted. The reader-visible DROP work moves to the newquest/m1/subscribe-drop-errors.md, which takes its place in the m1 README and as a blocker of lite-07 finalization.Impact
SubscribeEnd.streamsand the stream-count version helpers (Version::has_stream_count,hasStreamCount) in Rust and JS. Both MIGRATE.md files explain the update.Alternatives
Keep one accounting mechanism. Preserve the published application-specific error field, where 0 means unavailable without an error, rather than reusing stream-reset numeric codes.
Decisions
Scope of this PR (maintainer, 2026-10-19):
Follow-ups
quest/m1/subscribe-drop-errors.md): a dropped or cut group ends its reader with an error across cache reclaim, cap changes, and recovery. Its first decision is whetherSubscribeDrop.errorstays application-specific or carries the stream-reset codes on lite-07 only (recommended: the stream-reset codes on lite-07).Validation
just check: passed on the final head (Rust and JS suites, lint).just test interop --all: passed on the final head, including browser lanes and all 11 finite-tail/DROP lanes (lite-05, 06, and 07-wip, Rust and Node in both directions).just drafts checkandquest check: passed.(Written by Claude Opus 5.5)
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