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quest(m1): plan the subscribe-close throw fix and its backport - #5515
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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No actionable bugs found in this planning change. The producer-closed guard is a reasonable, minimal way to distinguish local teardown from an unsolicited publisher FIN; retaining the missing-SUBSCRIBE_END failure while the producer is open preserves the protocol check. The separate release backport, including only the signals fix/test from ca89952, avoids unrelated changes.
Implementation detail: make the ordinary-unsubscribe regression observe the internal response promise through a narrow test seam or helper. Public closure/log assertions alone would pass while the existing rejection is swallowed. Use explicit TRACK_INFO barriers for the setup race.
Verification: static inspection of the plans, relevant main/release code, and the referenced signals commit. No tests or relay repro executed; the reported 20/20 reproduction was not independently verified.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Reviewed commit: aa64148832
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| - An ordinary unsubscribe (subscribe, receive a group, close) whose peer | ||
| echoes the FIN without SUBSCRIBE_END ends without a ProtocolViolation. | ||
| Assert on the promise, not on a log; it fails without the fix. |
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With the existing mock-stream harness, the ordinary-unsubscribe test described here passes before the fix: #serveSubscribe creates closed from responses and immediately installs closed.catch(() => {}) at js/net/src/lite/subscriber.ts:764-769; after the local track closes, producer.closed wins the terminal race and the stream finishes normally, while the later #runResponses ProtocolViolation exists only on that already-handled private promise. Awaiting the track, mock FIN/cancel, or serve lifecycle therefore cannot provide the claimed failing assertion. Add a test seam that exposes/awaits responses (or another directly observable invariant), otherwise this does not land a regression test that fails without the fix.
AGENTS.md reference: AGENTS.md:L18-L18
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Agreed; 2145cc6 makes the test observe the responses promise through a narrow seam and says why a closure or log assertion would pass without the fix.
(Written by Claude Opus 5.5)
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WalkthroughThe PR adds two required quests to the M1 quest list. One defines expected behavior and test cases for closing a Priority: ➖ Normal Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly identifies the two planned subscribe-close fixes and their backport for @moq/net. |
| Description check | |
The description directly explains the @moq/net subscription-close bug, the proposed main-branch fix, and the release backport plan. |
| Docstring Coverage | |
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0… |
| 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. |
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Actionable comments posted: 1
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Inline comments:
Review comments at @quest/m1/subscribe-close-backport.md:
- Around line 77-82: Replace the fixed `await wait()` in the subscription-close
test with a readiness signal from the test transport or an instrumented
subscription that resolves once the `TRACK_INFO` read is pending in
`#openSubscribe`/`#trackInfo`; only then close `request` and `sub` so the test
exercises closing during the pending exchange.
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quest/m1/README.mdquest/m1/subscribe-close-backport.mdquest/m1/subscribe-close-throw.md
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Merging. The maintainer accepted the two-quest m1 layout and its rank right after Draft-20 FETCH edge cases. No mechanical fixes were needed: the branch merges cleanly with current (Written by Claude Opus 5.5) |
Plans two quests for a
@moq/netbug: closing a lite subscription while it still waits for TRACK_INFO surfacesProtocolViolation: subscribe stream ended without SUBSCRIBE_ENDas an unhandled rejection (deterministic on 0.4.3 against moq-relaymain; Node exits on it).quest/m1/subscribe-close-throw.md[S]: onmain,#runResponsesstops throwing for an end of stream the subscriber caused by closing, and the lite draft says a subscriber's cancel owes no SUBSCRIBE_END.mainalready has theracefix (ca89952) and avoids the setup-time SUBSCRIBE, but still throws (swallowed) on every ordinary unsubscribe.quest/m1/subscribe-close-backport.md[S]: ports that fix and theraceUntilloser fix ontoreleasefor a 0.17 patch after chore: release #5420, with a relay-backed repro.Scope, milestone, and rank are proposals for the maintainer's review.
Decisions
Goal: "Closing a subscription in @moq/net never throws ProtocolViolation for an end of stream the client caused itself, and never leaves an unhandled rejection."
How should the release line get the fix?
How should
#runResponsestell a self-caused end of stream from a publisher FIN without SUBSCRIBE_END?Clarify in the lite draft that a subscriber's cancel owes no SUBSCRIBE_END?
On the backport, stop
#openSubscribesending a SUBSCRIBE for a producer closed during setup?Layout
Rank in m1
(Written by Claude Opus 5.5)
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