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refactor(net)!: give each group one writer - #6020
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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>
Co-Authored-By: GPT-6.1-Sol <noreply@openai.com>
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Outcome at Validation is combined honestly: the full gate at The native interop run exited zero: all 32 positive publisher × subscriber cells, the enforcing Rust denial round, CLI FETCH close, clean and cut finite tails, and five wire preflight tests passed. Browser Failure evidence is retained locally: initial scoped default run had 2,526 passes, 46 failures and 1 timeout (8 skipped); the timeout was a helper discarding unfinished groups. The first full gate stopped compiling an immutable downstream finish binding. The next had 1,145 passes, 1 FFI fixture failure and 6,469 unrun (31 skipped). Complete native collection then had 7,613 passes and 2 relay fixture failures (31 skipped). These fixtures now finish only completed groups; intentionally stalled writers remain open. The final Python fixture and cfg(loom) compile failure are also preserved with their passing reruns. No assertions or timeouts were weakened. All 72 existing group-cost benchmark cases completed. Context: AMD Ryzen 9 5900XT, Linux 6.18.56, CPUs 8–11, shared host, jobs 2, wall-clock timing, 10 samples, 100 ms warm-up and 1 s measurement. One relay, one broadcast per publisher, each viewer watches one broadcast, four 64-byte frames per group. Both 64 B and 1 MiB backpressure windows were measured. No before/after baseline or performance improvement is claimed. Representative median microseconds/round, 1 MiB window; each cell SUBSCRIBE / FETCH.
Browser validation remains blocked by the host's known pinned Chromium dependency issue; Swift has no toolchain here. The quest is retained, and this PR stays draft under the user's hold. Suggested continuation is (written by GPT-6.1-Sol) |
The new-group relay fixture keeps its landed groups open, since an unfinished writer that drops now aborts its group and releases the frames the refresh judgment reads. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This PR completes it; browser interop runs nightly and no JS or FFI shape changes. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
An unfinished writer that drops now aborts its group and releases the frames the refresh judgment reads. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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WalkthroughGroup producers now enforce single-writer ownership, while cloneable handles provide shared observation. Owned frames return the writer when committed, and receive groups restore writers after frame ingestion. Track storage and subscriber paths now use handles. Call sites, tests, benchmarks, fuzz helpers, and migration documents were updated for the revised lifecycle. Priority: ➖ Normal Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 71.62% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 148 functions across 29 files. (5 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 and concisely describes the main change: each group now has one writer. 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. Description check The pull request description directly matches the changes. It explains the single-writer refactor, private Handle usage, writer-drop behavior, breaking API changes, fixture updates, migration document… Full details: Description check
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Explanation
The pull request description directly matches the changes. It explains the single-writer refactor, private Handle usage, writer-drop behavior, breaking API changes, fixture updates, migration documentation, and validation results.
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Full details: Docstring Coverage
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Explanation
Docstring coverage is 71.62% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 148 functions across 29 files. (5 skipped: 2 unsupported, 3 too large.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Inline comments:
Review comments at @rs/moq-net/src/recv.rs:
- Around line 25-41: Ensure the frame lifecycle restores the group writer
through restore only after frame.finish() succeeds or when no frame is open;
leave the writer unavailable when finish() returns an error. Apply this behavior
consistently to the Lite and IETF ingest state machines using create_frame_owned
and restore.
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📒 Files selected for processing: 37
py/moq-rs/tests/test_testing_clock.pyquest/m1/public-model/README.mdquest/m1/public-model/group-writer.mdquest/m1/public-model/ingest.mdrs/moq-c/src/publish.rsrs/moq-e2ee/src/group.rsrs/moq-ffi/src/producer.rsrs/moq-ffi/src/test.rsrs/moq-flate/src/stream/producer.rsrs/moq-json/src/snapshot/producer.rsrs/moq-json/src/stream/producer.rsrs/moq-json/src/window/producer.rsrs/moq-mux/src/container/consumer.rsrs/moq-mux/src/container/fmp4/import.rsrs/moq-mux/src/container/mkv/import.rsrs/moq-mux/src/container/producer.rsrs/moq-mux/src/container/ts/export_timing_test.rsrs/moq-mux/src/container/ts/release_test.rsrs/moq-net/MIGRATE.mdrs/moq-net/benches/track.rsrs/moq-net/src/coding/reader.rsrs/moq-net/src/error.rsrs/moq-net/src/fuzz.rsrs/moq-net/src/ietf/publisher.rsrs/moq-net/src/ietf/subscriber.rsrs/moq-net/src/lite/publisher.rsrs/moq-net/src/lite/subscriber.rsrs/moq-net/src/model/broadcast.rsrs/moq-net/src/model/frame.rsrs/moq-net/src/model/group.rsrs/moq-net/src/model/resume.rsrs/moq-net/src/model/track.rsrs/moq-net/src/recv.rsrs/moq-net/tests/loom.rsrs/moq-relay/tests/integration/connection.rsrs/moq-relay/tests/integration/smoke.rsrs/moq-stats/src/produce.rs
💤 Files with no reviewable changes: 3
- quest/m1/public-model/README.md
- quest/m1/public-model/group-writer.md
- rs/moq-net/src/error.rs
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The range filter from #5929 hands its owed groups out as handles, and its tests finish or reveal through a handle, under the one-writer rule. 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>
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Reviewed commit: d2d03a5dda
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A discarded group writer now aborts its group on the spot, so tests that dropped append_group()/create_group() to model a stalled or open group passed against a dead group instead. Hold those writers to the end of the test, and mark group::Producer must_use so a discarded writer warns. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The peek-aware next_owed from #6019 keeps returning a group::Handle. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Port the compression paths onto the single group writer (#6020): the Producer methods reach the state through its Handle, and adopt_head moved to Handle. Also fix the session bench's format string, which main left one placeholder short. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Problem
Cloneable group writers can race frame writes against finish. The track cache also keeps an unfinished writer alive after its owner drops, leaving readers waiting.
Change
Give each group one writer and a private non-writing
Handlefor caches and sessions. Owned frames take the writer and return it when they finish. Dropping an unfinished writer commitsDropped, releases cached frames, and retains committed recovery positions. Receive-frame cancellation reportsCanceland preserves an existing explicit abort cause. Fixtures finish completed groups or retain intentionally open writers.This completes and retires
quest/m1/public-model/group-writer.md, dropping it from the public-model epic and from ingest'sRequired.Public API and wire impact
moq-net):group::Produceris no longerClone,finishtakes&mut self, andError::FrameOpenis removed. It is now#[must_use], so discarding one warns. Dropping an unfinishedgroup::Producernow aborts the group withError::Droppedimmediately, even while the cache holds it.rs/moq-net/MIGRATE.mdhas the migration under## Unreleased, including the retainedDeref<Target = Info>clone pitfall.group::Handleispub(crate); nothing new is exported.moq-conly gains amutbinding. JSGroup.Produceris already a single object.quest/m1/public-model/ingest.md.Decisions
Settled by the maintainer on #5892 (recorded from the quest):
group::Handlenaming,finish(&mut self), deleteError::FrameOpen, keepDeref<Target = Info>and document the clone pitfall.Picked during the merge with
main(no maintainer input; recommended options):ietf::subscriber::new_group_tests::Relay::land) wrote frames into a group and dropped its writer, which now aborts the group and releases the frames the refresh judgment reads.track::test::refresh_grouphelper had the same shape.track::test::new_group_requests_aggregate_out_of_sightwith the NewGroup aggregation; this PR had only edited it.track::test::evicted_parked_group_wakes_the_clean_end,an_aborted_candidate_keeps_the_parked_copy_watched,an_abort_removes_a_non_prefix_parked_entry, and thetrack_parked_abortbench with the parked-cursor machinery; this PR had only edited them.next_owed,poll_next_in_rangewith its window) handed outgroup::Producerclones from the cache.group::Handle, like every other cache read under one writer. Its tests reveal throughwithheld.handle()and finish the groups they only create.group::Producer#[must_use]so a discarded writer warns; MIGRATE.md names the lint.interop --all.interop.ymlruns--allnightly.Validation
just checkat3316c6d39exited 0: 7,707 native tests passed (31 skipped), lint (deny warnings, including the newmust_use), rustdoc, doctests, and the 102 Python binding tests.just checkafter mergingmainat697441d81exited 0: 7,691 native tests passed (30 skipped), the minimum-feature and feature-scoped suites, lint, rustdoc, doctests, and the 102 Python binding tests. The head then merged onlyf13283b30(the CARLA demo, no group writer use); the workspace compiles all targets andmoq-carla-bridge's 16 tests pass.cargo nextest --all-targets --all-features --no-fail-fast(excluding fuzz) at the earlier merge: 9,426 passed.moq-cli::integration export::redundant_importers_switch_through_bufferbloat_on_lite_07failed once in ajust checkrun. It is a pre-existing flake: it also fails about 1 in 3 runs on unchangedmain(7a14a489c), with the stitching export exiting onthe source's clock runs -6238514.8 ppm off ours, past the 30 ppm. The bufferbloat shaper slows delivery below real time and the TS follower's drift check rejects it.Remaining
Swift checks were not run locally (no Swift toolchain on the host). Browser interop is left to the nightly.
No open API decisions.
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