fix(net)!: report a reader's largest within its local bounds by kixelated · Pull Request #5924 · moq-dev/moq

kixelated · 2026-10-19T06:29:01Z

Problem

track::Subscriber::largest() and track::Ordered::largest() reported the track's largest location even when the reader had capped itself with set_groups(..N). A reader that skips to its newest group, as the data consumers in #5677 do with set_groups(largest..), jumped past its own cap, and the omitted end then removed the cap entirely. Separately, a relay's idle copy reported the largest an ended feed left, so a player could start from stale state while a fresh upstream subscription was still starting. The JS Track.Subscriber.largest() / Track.Ordered.largest() had the bounds gap too.

Semantics

The maintainer decided on 2026-10-19 that largest() never reports ephemeral, cache-derived state. It reports only upstream-confirmed state: the source's reported largest (SUBSCRIBE_OK / SUBSCRIBE_START) and what its live feed delivered since.

Within the bounds: a reader's largest() / poll_largest() reports the track's largest while it is within the reader's local floor and cap (as set_groups / setGroups set them), as before.
Past the cap or below the floor: nothing. The cache never stands in with the newest group below the cap.
Moving the bounds (set_groups, and the crate's start_at / raise_start_to / end_at) wakes a parked poll_largest, which reports the largest once it is within the new bounds and newer than the last report. The largest is a running max, so new bounds hold the current edge or nothing, never one below the last report: a cap moved below the largest stays pending, and while let Some(l) = largest().await { set_groups(l.group..) } does not spin.
Live gate (Rust): every poll_largest (track::Producer, track::Consumer, Subscriber, Ordered) waits until the track's feed is live (Feed::Live), or until nothing more can move its largest (sealed, aborted, or settled), so an idle relay copy reports nothing until its new upstream answer shows, even one that declared an end it has not reached (Codex). Cached groups are still served meanwhile. A local producer is live from creation, so it is unaffected. JS has no idle copies: its largest is only ever reported or written by the live feed, so it needs no gate.
The floor is the cursor's floor, so a subscription whose ranges start past the live edge reports nothing until the edge reaches them. The maintainer confirmed on 2026-10-19 that the range floor counts as a local bound.

Approach

Rust (moq-net). The cache's poll_largest / take_largest take crate-private Bounds and filter the existing Largest (a running max of the source's report and frame writes, not pruned by expiry) to them. The shared poll_largest in track.rs first polls the track state for live, then the cache, then the settled end. The resume cursor passes the reader's bounds to the serving copy, and seeds its floor from the subscription's absolute floor as a plain cursor does (Codex). Subscriber keeps the last report and the polling task's Waker, which a bounds change wakes.
JS (@moq/net). Subscriber.largest() checks #state.largest against the cursor and races the largest, closed, settled-end, and cursor signals. A front's resumed reader (feat(net): resume JS tracks across same-epoch route swaps; keep a replaced route feeding until its successor delivers #5836) gets the same check in the resume source, which reports the serving copy's largest only within the reader's cursor and wakes when it moves, mirroring Rust's resume path.
Removed from the previous round: the cache-derived machinery (Rust largest_within and the cache revision counter, JS written signal, hooks.groupFinished, the timeline scan) and both largest-finish benchmarks. With no stand-in, a write that leaves the largest in place wakes nobody, so there is no new fan-out to measure.
Callers. moq-c's raw reader re-applies each subscription update with set_groups, so it reads the edge its relative ranges count from off the unbounded track::Consumer rather than its own bounded largest (Codex). It polls that edge synchronously, so under the live gate it now applies an update's wire preferences at once and holds a relative range's local bounds until the edge reports, re-polled with the task's waiter, and holds group delivery meanwhile so no group lands under the old floor (Codex, CodeRabbit). A floor an earlier update put above the edge still can't be lowered, because set_groups only raises the floor, as on main; the assigning floor in the rename quest owns that. The positioning readers that used a one-shot noop poll_largest (moq-video and moq-audio decode consumers, moq-cli play, moq-room chat) pended on a warm copy still waiting on its source and replayed its backlog, so they now wait for largest() before their first read; the wait ends with the track, and subscribing itself never blocks (Codex, maintainer's choice). moq-room's chat::Subscriber::new stays synchronous and waits in its first poll_recv, as the JS chat reader does in recv. A repo-wide sweep found no other remote positioning caller: moq-json window, moq-hls history, moq-relay fetch, moq-gst and the JS json/flate/room readers already await largest(); the bindings reach it only through moq-c; the noop pollers left (moq-mux container::Producer, the moq-json snapshot producer, the moq-cli publish and moq-mux TS programs announce gates) read local producers, which are live from creation; and the moq-mux container consumer's live() start polls with its real waiter and falls back to the newest arrived group, as on main. The wire publishers answer from poll_live, peek_largest and latest_sequence, which this PR leaves alone.
Quests. quest/m1/public-model/serve.md records the 2026-10-19 decisions (range naming, floor as a local bound, upstream-only largest). The new quest/m1/track-live.md covers a public live signal (poll_live / live()) so callers can skip old cached groups while a fresh upstream subscription starts. It is not exported here.

Public API and wire impact

Behavior change, same signatures: track::Subscriber::{largest, poll_largest}, track::Ordered::{largest, poll_largest}, JS Track.Subscriber.largest, Track.Ordered.largest; and in Rust, track::Producer / track::Consumer largest() now waiting out an idle copy. ## Unreleased entries in rs/moq-net/MIGRATE.md and js/net/MIGRATE.md say how to migrate.
No new exported items. Bounds, Reported, and the cache helpers are crate-private.
No wire change.

Tests

Rust (model::track): largest_reports_only_within_the_bounds (a cap below the edge pends, an inclusive cap reports the group it names, a floor above the edge waits for a group to reach it), largest_follows_the_bounds_as_they_move (lifting and lowering the cap wake a parked poll, a lowered cap pends, lifting it again leaves the last report standing, a floor below the largest reports nothing new), largest_waits_for_an_idle_copy_to_go_live (an idle copy with cached groups pends until the answer shows; fails without the gate), largest_keeps_its_last_report_across_an_idle_move, largest_waits_for_an_idle_copy_with_a_future_end (Codex). model::resume: largest_honours_the_cap_on_the_serving_copy, largest_honours_the_subscription_floor_on_the_serving_copy (Codex).
moq-room: a_warm_copy_starts_at_the_newest_window, the same idle relay copy for chat: a new reader starts at the newest window instead of a message that has since left it. Fails with the old noop poll.
moq-audio: latest_skips_a_warm_copys_backlog, over a memory session: a relay copy goes idle holding cached groups, and a latest start joins at the live edge once it goes live instead of replaying them. Fails with the old noop poll.
moq-c: raw_track_relative_update_counts_from_the_track_edge. The deferred relative update has no regression test: idling a relay copy is crate-private to moq-net, so moq-c reaches it only through a timing-dependent two-session race.
JS (resume.test.ts): the largest honours the reader's bounds on the serving copy (a cap and a subscription floor on a front reader). JS (track.test.ts): largest reports only within the bounds and largest follows the bounds as they move, mirroring Rust. a mid-group end survives eviction and a filtered late reader now expects nothing for a reader capped below the only group. The isPending helper observes a settled promise correctly (CodeRabbit).
No sleeps: Rust drives poll_largest with noop and flag waiters; JS uses untimed tracks and a microtask settle.
just check passes locally.

Follow-ups

feat(data)!: data consumers return each value's timestamp #5677 drops its latest() and uses the bounded largest() (planned there).
The JS @moq/json and @moq/flate snapshot consumers use setGroups({ start }), which also drops a caller's cap, the same bug feat(data)!: data consumers return each value's timestamp #5677 fixes in Rust. Tracked under the Rebinding bullet in quest/m1/public-model/serve.md.
The set_groups to with_range rename and its siblings (quest/m1/public-model/serve.md), and the public live signal (quest/m1/track-live.md).

🤖 Generated with Claude Code

track::Subscriber and track::Ordered largest()/poll_largest() report the largest location within the bounds set_groups set, instead of the track's. Past a cap of ..N they report the newest cached group below N; below the floor, nothing. Moving the bounds wakes a parked poll and reports again within the new ones, even below the last report. The resume cursor passes the reader's bounds to the serving copy. The JS Track.Subscriber and Track.Ordered largest() follow the same rules. moq-c's raw reader lifts the previous update's cap before reading the edge its relative ranges count from. Record the maintainer's change of the set_groups rename to limit in the serve quest. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

coderabbitai · 2026-10-19T06:29:10Z

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Walkthrough

Rust and JavaScript largest-location polling now respects reader group bounds and can report again when bounds change. Rust polling also waits for readable feed state. Raw-track subscription updates now resolve relative starts from the track edge. Migration notes, tests, and quest documents describe these changes and planned serving and live-status APIs.

Priority: ➖ Normal

Merge Risk: 🔵 Low · up to 4a54f

A raw reader can briefly receive a cached group outside its updated range. Hold group delivery until the relative bounds resolve; the JavaScript pending tests no longer have the reported helper defect.

Pre-merge checks: 4 · 1

Failed checks: 1 warning

Check name	Status	Explanation	Resolution
Docstring Coverage		Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 68 functions across 12 files. (2 skipped:…	Write docstrings for the functions missing them to satisfy the coverage threshold.

Passed checks: 4 passed

Check name	Status	Explanation
Title check		The title clearly and concisely identifies the main behavior change: reporting a reader's largest position within its local bounds.
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 clearly explains the bounded largest behavior, idle-copy handling, implementation changes, tests, and migration impact covered by the changeset.

Full details: Docstring Coverage

Explanation

Docstring coverage is 75.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 68 functions across 12 files. (2 skipped: 2 unsupported.)

Resolution

Write docstrings for the functions missing them to satisfy the coverage threshold.

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chatgpt-codex-connector · 2026-10-19T06:29:16Z

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- Line 1705: Update the `largest()` completion check so track-wide
`largestEnded` does not end a capped reader while an in-range group can still
grow; use reader-local finality or track closure instead. Add a test where a
lower group remains open after a higher group finalizes and verify the capped
reader’s next `largest()` call remains open.

Review comments at @rs/moq-net/src/model/track.rs:
- Around line 2133-2139: Update the Rust polling boundary in `poll_largest` so
its end predicate accounts for `bounds`: keep polling pending while the newest
cached group within the bounds is open, even if the track-wide largest group has
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rs/moq-net/MIGRATE.md
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The track's settled end ended a capped reader's largest stream even while the group it reports under the cap could still take frames. Past the cap, the stream now ends on the track's settled end only once that group has finished; the track closing still ends it. A group finishing bumps the largest revision so a capped reader wakes on it. 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 # rs/moq-net/MIGRATE.md

kixelated · 2026-10-19T18:35:43Z

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The raw reader's own largest reports within the bounds an update is replacing, so read the edge from the unbounded track handle instead of lifting the cap first. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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peek_largest answers SUBSCRIBE_START, a wire answer, so it reads the track's largest regardless of the reader's local bounds. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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JS bumped a written signal on every sink per finish, and every parked largest() reader raced it. Share one signal across the sinks and race it only while capped below the largest. Sweep tracks x subscribers in a new js/net largest bench (nightly), and add a Rust track_largest_finish bench over subscribers: there a finish already wakes each parked reader through its settled-end park on the track state, as on main, and the revision bump measures no extra cost. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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- Around line 1928-1932: Update the isPending helper to track whether the
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js/justfile
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js/net/src/internal.ts
js/net/src/track.test.ts
js/net/src/track.ts
quest/m1/public-model/serve.md
rs/moq-c/src/consume.rs
rs/moq-c/src/test.rs
rs/moq-net/MIGRATE.md
rs/moq-net/benches/track.rs
rs/moq-net/src/model/resume.rs
rs/moq-net/src/model/track.rs
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Racing promise.then(() => false) against an already resolved true always picks true, so every pending assertion passed even when largest() resolved. Record settlement with a flag after a macrotask settle instead. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

A reader's largest() reports the track's largest only while it is within its bounds, and only once the track's feed is live: never a cached group standing in for it past the cap, and never an idle copy's leftover edge. Drops the cache-derived fallback and its revision counter. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

A capped reader's largest() no longer reports the newest cached group under its cap; past the cap or below the floor it reports nothing. This removes the JS written signal, hooks.groupFinished, the timeline scan, and both largest finish benchmarks. Adds the track-live quest for a public live signal. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated · 2026-10-19T21:11:26Z

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A resume reader started its local floor at 0, so a subscription whose absolute floor sat above the serving copy's edge reported a bounded largest() below it. Seed the floor from the subscription, as a plain cursor does. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Moving the bounds cleared the last report before the poll, so a move that pended (an idle copy, or bounds holding nothing yet) later repeated an unchanged largest. Keep the last report and the pending move until a largest lands within the new bounds, in Rust and JS. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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- Line 11: Update the migration note and Subscriber.largest() documentation to
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poll_largest kept the polling task's waker even after it reported, so a later bounds move woke a finished task. Park it only on Pending and drop it on Ready. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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moq/rs/moq-net/src/model/cache.rs

Lines 763 to 768 in 4b07968

    
           		.poll(waiter, |largest| match newer(largest).is_some() || largest.ended { 
        
           			true => Poll::Ready(()), 
        
           			false => Poll::Pending, 
        
           		}) 
        
           ); 
        
           let next = newer(&largest);

Keep the largest stream terminal after returning None

When a track finishes while its current largest is outside this reader's bounds, this poll returns None with seen unchanged; if the same reader later widens its bounds, newer becomes populated and a subsequent poll returns that old position after the stream already terminated. This violates the documented None-on-end contract and is mirrored in js/net/src/track.ts, where widening after undefined likewise exposes the ended track's largest. Record terminal state per reader so later bounds changes cannot resurrect the stream.

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A track that finished with its largest outside a reader's bounds ended the stream, but widening the bounds afterwards reported that largest anyway. Record the end per reader, in Rust and JS. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated · 2026-10-19T23:56:07Z

Addressed the Codex P2 from review 5579058228 ("Keep the largest stream terminal after returning None") in 8592e5f: a reader's largest stream records its end, so widening the bounds after it ended no longer reports a largest it never reported. Mirrored in Rust and JS, with largest_stays_ended_when_the_bounds_widen and largest stays ended when the bounds widen, both failing without the fix.

(Written by Claude Opus 5.5)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated · 2026-10-20T00:17:06Z

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Keeps both Unreleased MIGRATE entries in js/net and rs/moq-net (this PR's largest() note and #5930's track demand note). Boxes moq-mux's new SiState::Active reader: the larger track::Ordered tripped clippy's large_enum_variant, as moq-hls already boxes its live reader. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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The subscriber cloned the polling task's raw waker, so a dropped largest() future left a registration behind. Register the waiter on a kio WaiterList instead, whose entries die with their waiter. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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moq-video, moq-audio and moq-cli play positioned a latest-only reader with a one-shot noop poll of largest(). On a warm relay copy still waiting on its source that poll is pending, so they set no floor and replayed the cached backlog once the copy went live. Await largest() instead, which ends with the track. Adds the user-facing meaning to the moq-lite concept page. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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Keeps both Unreleased entries in js/net/MIGRATE.md: this PR's largest() note and #5979's versions note. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

chat::Subscriber::new positioned with a one-shot noop poll_largest, which pends on a relay copy still waiting on its source, so a new reader replayed the copy's cached backlog. It now waits for largest() in its first poll_recv, ending with the track, as the JS reader does. A repo-wide sweep found no other remote positioning caller polling with a noop waiter. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Keeps both Unreleased entries in js/net/MIGRATE.md and rs/moq-net/MIGRATE.md: this PR's largest() note and the lite-07 SUBSCRIBE_DROP note. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Merge remote-tracking branch 'origin/main' into moq-net/largest-bounds

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kixelated and others added 4 commits October 19, 2026 00:22

Merge remote-tracking branch 'origin/main' into moq-net/largest-bounds

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quest: record the range naming and floor decisions for #5924

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Merge remote-tracking branch 'origin/main' into moq-net/largest-bounds

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# Conflicts: # js/net/MIGRATE.md # rs/moq-net/MIGRATE.md

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kixelated and others added 2 commits October 19, 2026 11:59

Merge remote-tracking branch 'origin/main' into moq-net/largest-bounds

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fix(net): peek the track's unbounded largest after merging #5947

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peek_largest answers SUBSCRIBE_START, a wire answer, so it reads the track's largest regardless of the reader's local bounds. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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kixelated and others added 4 commits October 19, 2026 13:27

Merge remote-tracking branch 'origin/main' into moq-net/largest-bounds

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fix(net): hold largest's bounds waker only while parked

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poll_largest kept the polling task's waker even after it reported, so a later bounds move woke a finished task. Park it only on Pending and drop it on Ready. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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kixelated mentioned this pull request Oct 20, 2026

quest: plan five follow-ups from the 2026-10-19 batch #6021

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docs(quest): note the JS snapshot consumers drop a caller's cap

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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kixelated and others added 2 commits October 19, 2026 20:20

Merge remote-tracking branch 'origin/main' into moq-net/largest-bounds

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Keeps both Unreleased entries in js/net/MIGRATE.md: this PR's largest() note and #5979's versions note. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated enabled auto-merge October 20, 2026 04:27

Merge remote-tracking branch 'origin/main' into moq-net/largest-bounds

4df60a8

Keeps both Unreleased entries in js/net/MIGRATE.md and rs/moq-net/MIGRATE.md: this PR's largest() note and the lite-07 SUBSCRIBE_DROP note. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

kixelated added this pull request to the merge queue Oct 20, 2026

Merged via the queue into main with commit 81d8a63 Oct 20, 2026
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kixelated deleted the moq-net/largest-bounds branch October 20, 2026 05:11

	.poll(waiter, \|largest\| match newer(largest).is_some() \|\| largest.ended {
	true => Poll::Ready(()),
	false => Poll::Pending,
	})
	);
	let next = newer(&largest);

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