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quest(m1): replace SUBSCRIBE_ALL with a TRACKS listing - #5985
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The maintainer chose pull over push on 2026-10-19: a moq-lite TRACKS request lists a broadcast's tracks and the subscriber SUBSCRIBEs per track, so no relay merges pushed feeds into pulled copies. SUBSCRIBE_TRACKS maps both ways, learning an IETF peer's tracks with FORWARD=0. The SUBSCRIBE_OK start fix found in #5931 becomes its own quest. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Records the maintainer's 2026-10-19 decisions: one broadcast per TRACKS, TRACKS gates the lite-07 cut, and the listing reuses TRACK_INFO, marks the initial set like ANNOUNCE_OK's Active Count, and names removed tracks. SUBSCRIBE_TRACKS maps each event, holding a FORWARD=0 PUBLISH paused so PUBLISH_DONE can stand in for removal. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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A relay answers caught up at once with what it holds and never waits on its upstream; upstream tracks arrive as live adds. Decided by the maintainer 2026-10-19. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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A count sent first breaks when an initial track is removed before a slow reader reaches it, so CAUGHT_UP is an ordered event and IDs are assigned per emitted add. A non-TRACK_ENDED PUBLISH_DONE fails the listing instead of hiding a live track. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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WalkthroughThe milestone plans add Announce SYNCED and TRACKS, replacing the lite-07 Active Count requirement and the archive’s SUBSCRIBE_ALL approach. The archive plans describe discovering broadcasts with ANNOUNCE, listing tracks with TRACKS, and recording tracks through individual SUBSCRIBE requests. They also update SUBSCRIBE_TRACKS behavior and timed-track keys. A separate plan documents the SUBSCRIBE_OK Group mismatch between warm and cold relays. Priority: ⬇️ Low Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly and concisely describes the main change: replacing SUBSCRIBE_ALL with a TRACKS listing. |
| 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. |
| Description check | |
The pull request description directly explains the replacement of SUBSCRIBE_ALL with TRACKS, related SYNCED changes, archive updates, moq-transport behavior, and the affected quest files. |
Full details: Docstring Coverage
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Explanation
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 files. (7 skipped: 7 unsupported.)
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No count field remains: TRACKS and lite-07 announces mark their initial set with one ordered CAUGHT_UP event. Removal names the track, so a hop keeps two positions per reader instead of per-reader IDs. A covering-prefix route is not inventory, so the archive records broadcasts announced at their own path. Capped SUBSCRIBE_TRACKS tracks are signaled with PUBLISH_BLOCKED or PUBLISH_SKIPPED. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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PUBLISH_SKIPPED names a track that exists, so it is a listing add. A held paused SUBSCRIBE supplies its TRACK_INFO and its end, and failing that fails the listing. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Actionable comments posted: 6
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @quest/m1/announce-caught-up.md:
- Around line 18-19: Clarify the Announce contract so CAUGHT_UP completes the
observable initial set: routes whose ANNOUNCE_START reaches the subscriber
before CAUGHT_UP are included, while an initial route removed before its start
is observed is omitted, consistent with TRACKS. Update the surrounding
description so consumers can determine when the initial set is complete.
Review comments at @quest/m1/archive/subscribe-tracks.md:
- Around line 33-36: Update the FORWARD=0 description to make LARGEST_OBJECT
conditional: include it when the track has published objects and omit it when
none have been published. Keep the other SUBSCRIBE_TRACKS behavior unchanged.
- Around line 60-64: Update the FORWARD=1 and omitted-FORWARD branches in the
track-subscription flow so policy-based skips do not use PUBLISH_BLOCKED; use
another valid draft-18 response, or reserve PUBLISH_BLOCKED for cases where no
bidirectional stream is available.
Review comments at @quest/m1/archive/tracks.md:
- Line 55: Update the TRACKS refusal handling so authorization and other
failures remain distinguishable from a non-broadcast result; propagate the
refusal or represent these outcomes separately, ensuring archive::Producer does
not omit a broadcast merely because the caller lacks permission.
- Around line 79-81: Update the CAUGHT_UP guarantee and its event rules so the
snapshot covers tracks still live at catch-up, consistent with dropping an
add/remove pair before delivery. Do not promise every track that existed when
the request began unless those initial events are retained until delivery.
- Around line 95-96: Define sequence continuity for same-name track re-adds in
the TRACKS archive contract so archive::Producer can distinguish each addition;
if continuity is not guaranteed, include an incarnation identifier in archive
object identity or explicitly reject re-adds that would reuse an existing key.
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📒 Files selected for processing: 10
quest/m1/README.mdquest/m1/announce-caught-up.mdquest/m1/archive/README.mdquest/m1/archive/consumer.mdquest/m1/archive/producer.mdquest/m1/archive/subscribe-all.mdquest/m1/archive/subscribe-tracks.mdquest/m1/archive/tracks.mdquest/m1/lite07-finalize.mdquest/m1/subscribe-ok-start.md
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- quest/m1/archive/subscribe-all.md
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Inline comments:
Review comments at @quest/m1/archive/tracks.md:
- Around line 113-114: Update the track-removal wording near “there are no entry
IDs” to define removal as leaving the broadcast’s enumerable track inventory,
not as guaranteeing a failed SUBSCRIBE. Clarify that a broadcast::Dynamic
handler may still serve the name on demand, so a later SUBSCRIBE may succeed.
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quest/m1/README.mdquest/m1/announce-synced.mdquest/m1/archive/README.mdquest/m1/archive/producer.mdquest/m1/archive/subscribe-tracks.mdquest/m1/archive/tracks.mdquest/m1/lite07-finalize.md
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moq/quest/m1/archive/consumer.md
Lines 20 to 24 in 85b6049
Poll completion markers outside forward LIST cursors
When a consumer starts following before recording completes, its per-track cursor advances past the newest zero-padded object key, but the subsequently written .end key sorts before every numeric key. A later LIST using StartAfter that object can therefore never observe .end, so the replay remains open forever despite the completed archive. Check the fixed marker separately, or place completion state where the forward cursor can discover it.
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Problem
moq-dev/moq#5931 implemented SUBSCRIBE_ALL, a push request for every track under a prefix. At a relay it had to merge pushed feeds into pulled copies: copies shared by path and epoch, feed attach, bounded floor SUBSCRIBEs, aggregate preferences, and a choice between duplicate copies and splicing an epochless restart. On 2026-10-19 the maintainer chose pull instead:
Approach
TRACKS.
subscribe-all.mdbecomesquest/m1/archive/tracks.md. A lite-07 TRACKS request lists one broadcast's tracks, and the subscriber SUBSCRIBEs per track. It has three events:Announce SYNCED. New quest
quest/m1/announce-synced.md: lite-07's Announce stream replaces ANNOUNCE_OK'sActive Countwith the same SYNCED event, identical in shape. Published versions keep the count. It is Required bylite07-finalize.mdand updates the lite draft.Route announcements are not inventory. A prefix consumer covers broadcasts announced at their own path, and a TRACKS refused on an announced path means it is not a broadcast. The archive producer contract is narrowed to match.
Why the 2026-10-17 rejection no longer holds. A SUBSCRIBE with no floor and a max age at least the publisher's starts at the oldest cached group, so a new track's first groups survive the extra RTT while they are retained. The single push mechanism also cost more than two.
Costs. An RTT per new track, and a subscription-cap slot per track (
session.subscriptions, 1000).Untrusted input.
announcescap.moq-transport.
subscribe-tracks.mdmaps every event both ways:Other gaps it records:
announcescap.An unsolicited PUBLISH stays refused.
Salvage from feat(moq-net): SUBSCRIBE_ALL on moq-lite-07-wip #5931. The SUBSCRIBE_OK stale-start fix becomes
quest/m1/subscribe-ok-start.md. The resolved-demand fix is moq-dev/moq#5986.The archive README, producer, consumer,
lite07-finalize.md, and the m1 README now point at TRACKS.Archive layout. Each stored sequence keeps its form, group or datagram, and replays in that form. Completion markers: a track's
endrecords a clean endPositionor its error code (decision 11), written once its groups and datagrams have both ended and are stored; the broadcast's.endfollows once every listed track has a marker. The track marker is namedendso it sorts after the zero-padded numeric keys and the consumer'sStartAfterrefresh reaches it with no extra request (a~prefix would sort later but object_store refuses~); the broadcast.endis seen by the delimiter LIST that finds added tracks. Only a crash or an early stop leaves no marker, so the archive reads as live.Timed archive keys gain the first frame index (
<first group>-<first frame>-<first pts>), so the fragments of an oversized timed group stay unique and ordered when pts repeats or goes backward (Codex review 5578421729 body finding, no thread).A listing PUBLISH for a track we already SUBSCRIBEd, established or pending, is refused on every draft (DUPLICATE_SUBSCRIPTION on draft-18, UNINTERESTED from draft-19), and the existing SUBSCRIBE is the entry, keeping one upstream subscription per track.
Decisions
Settled by the maintainer (2026-10-19):
Discovery mechanism
.trackstrackTRACKS scope
Does TRACKS still gate the lite-07 cut?
Listing events
Initial-set marker
Active Countsent firstSynced at a relay
Inbound SUBSCRIBE_TRACKS: how we answer each listed track, by the peer's FORWARD. We never push every track's data unasked.
No draft allows downgrading FORWARD=1 to a paused PUBLISH. Drafts 18 and 19 say the resulting PUBLISHes "will set the FORWARD parameter to 1". Drafts 20 to 22 use the SUBSCRIBE_TRACKS parameters as each PUBLISH's initial subscription parameters, and forbid PUBLISH_STATE_NOTIFY from changing a subscriber-controlled one unasked.
When SYNCED is sent
poll_nextreturns Pending), or once the reader has been sent N events, N being the snapshot size it recorded at subscribe ("It doesn't even need to be the exact count, it could be something like count * 2 as an upper bound"), so live churn cannot postpone it. N suffices because each reader's queue delivers in insertion order, so the snapshot stays ahead of live entries; origin's lexicographicBTreeMaporder would not hold this, so the announce rule switches the origin consumer to insertion order. A removal may land before SYNCED, and an unreached add/remove pair collapsesStalled readers under churn
Nested SUBSCRIBE_TRACKS requests
.endstill follows once every track has a markerAgent picks, open to challenge (the maintainer was not asked):
announcescap. The alternative is relying on flow control and memory alone.producer.md): keep a prefix, so hosts do not each repeat the ANNOUNCE loop. The alternative is one broadcast per producer.session.subscriptions.Impact
None. This PR only changes quest files. The planned work adds a lite-07-wip stream and moq-transport SUBSCRIBE_TRACKS support.
Alternatives
See decisions 1 to 6. A
.trackstrack reuses delivery, but it mixes control into the media namespace and needs its own retraction encoding.Follow-ups
drafts/draft-lcurley-moq-active-count.md) sends a count up front too. It stays out of scope as a separate published draft, but it may deserve the same SYNCED treatment.quest checkandjust checkpass.(Written by Claude Opus 5.5)
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