quest(moxygen): Moxygen compatibility - #4253
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
…4276) Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
…4274) Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Keeps the line's js-ietf-datagram text and its subgroup-refusal, fetch-only, and datagram-range follow-ups in the m1 README, takes main's audited list otherwise, and keeps both the datagram and SETUP token paragraphs in the standard concept doc. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…dit/moxygen-blockers
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ect field 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>
quest(moxygen): block the line on the #4276 group fetch fill findings
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…he wanted frame - FETCH_OK's End Location inside the group is a promise: a stream short of it, or past it, fails the group instead of caching it. - The first fetch object must spell out every field it could inherit. - The upstream FETCH asks from group::Request::frame_start and numbers the fill from it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…upstream 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>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
fix(moq-net): an IETF group fetch fill is complete or refused, from the wanted frame
…p-4558 # Conflicts: # quest/m1/moxygen/README.md
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
fix(ietf): skip FETCH holes to the next cached group when nothing is upstream
Aligns quests after the 2026-09-30 audit (#4589): the branch copies of ietf-subgroup-refusal (now m0) and datagram-range (merged into datagram-unfetchable) are deleted. fetch.md stays deleted; the draft-20 FETCH work main added to it moves to quest/m1/ietf-fetch-location.md. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Every child merged and the docs changed inline, so the README is deleted and its references dropped. signed-priority is no longer blocked. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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WalkthroughRust adds IETF MoQ Transport datagram encoding, decoding, sending, and receiving. It also expands FETCH handling for supported drafts and adds cache-miss group FETCH support. The default track priority changes to 127 across Rust, JavaScript, Dart, and FFI-facing APIs. Tests, documentation, and quest notes are updated to reflect these changes and their transport and draft coverage. Priority: ➖ Normal Merge Risk: 🟡 Moderate · up to This change adds IETF FETCH and datagram support. On relays, a cache-miss group can hang readers indefinitely if the upstream fetch stream never arrives. That should be bounded before merging. Two smaller boundary-handling issues also remain: one in the reported FETCH end location and one in parsing a peer-supplied end location. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to The new flows preserve important request and track boundaries, and unsupported ranges are explicitly refused. The main remaining concern is resource containment: a whole-group FETCH retains its response while waiting for the publisher to finish, without an established request deadline or aggregate buffering budget. No cross-tenant access or privilege escalation was demonstrated. Retained concerns
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Review comments at @rs/moq-net/src/ietf/datagram.rs:
- Line 101: Add the decoder’s version-specific validation to the
DatagramBody::Status encoding branch before calling status.encode: on Draft17
and later, reject non-Normal statuses when self.properties is present with
EncodeError::InvalidState. Preserve the existing encoding behavior for legacy
versions and Normal statuses.
Review comments at @rs/moq-net/src/ietf/publisher.rs:
- Around line 127-146: Update the error match in walk_fetch around
track.fetch_group to handle both Error::NotFound and
Error::Stream(StreamError::NotFound) through the existing missing-group logic.
Preserve the current handling of all other errors.
- Around line 109-173: Bound walk_fetch so sparse ranges cannot trigger
unbounded serial fetch_group attempts and accumulated frame data cannot exceed a
byte budget; when either limit is reached, return collected groups through the
existing delivered-end handling. Use the existing FETCH end-location flow in
run_fetch_stream to handle a large end location with a nonzero object, avoiding
{u64::MAX, 0}, which is rejected when its group must be incremented.
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📒 Files selected for processing (46)
dart/moq_ffi/lib/src/moq.dartdoc/concept/standard.mddoc/lib/rs/moq-net.mddrafts/draft-lcurley-moq-e2ee.mdgo/wrapper/README.mdgo/wrapper/types.gojs/net/src/ietf/priority.test.tsjs/net/src/lite/track.test.tsjs/net/src/track.test.tsjs/net/src/track.tskt/README.mdpy/moq-rs/README.mdquest/m0/ietf-legal-input.mdquest/m0/ietf-subgroup-refusal.mdquest/m1/README.mdquest/m1/datagram-unfetchable.mdquest/m1/e2ee/README.mdquest/m1/ietf-fetch-location.mdquest/m1/ietf-fetch-only.mdquest/m1/js-ietf-datagram.mdquest/m1/moxygen/README.mdquest/m1/moxygen/datagram.mdquest/m1/moxygen/fetch.mdquest/m1/moxygen/priority.mdquest/m2/signed-priority.mdrs/libmoq/src/api.rsrs/moq-e2ee/tests/transport.rsrs/moq-ffi/src/consumer.rsrs/moq-ffi/src/producer.rsrs/moq-net/Cargo.tomlrs/moq-net/benches/fetch.rsrs/moq-net/src/fuzz.rsrs/moq-net/src/ietf/datagram.rsrs/moq-net/src/ietf/fetch.rsrs/moq-net/src/ietf/mod.rsrs/moq-net/src/ietf/publisher.rsrs/moq-net/src/ietf/session.rsrs/moq-net/src/ietf/subscriber.rsrs/moq-net/src/lite/track.rsrs/moq-net/src/model/bandwidth.rsrs/moq-net/src/model/datagram.rsrs/moq-net/src/model/resume.rsrs/moq-net/src/model/track.rsrs/moq-net/tests/datagram.rsrs/moq-tokio/tests/broadcast.rsswift/README.md
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- quest/m1/moxygen/README.md
- quest/m0/ietf-subgroup-refusal.md
- quest/m1/moxygen/priority.md
- quest/m1/moxygen/datagram.md
- quest/m1/moxygen/fetch.md
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| subscriber.clone(), | ||
| version | ||
| ))); | ||
| let mut datagrams = std::pin::pin!(err_only(run_datagrams(adapter.clone(), subscriber.clone()))); |
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When a Rust moq-transport publisher sends an OBJECT_DATAGRAM to an @moq/net browser subscriber, the JavaScript IETF connection has no datagram reader or codec, so the media payload is silently discarded. The repository requires a rs/moq-net wire change to update js/net in the same change; add the corresponding JavaScript send and receive paths and cross-language tests rather than deferring them. (Written by GPT-5.6 Sol)
AGENTS.md reference: rs/moq-net/AGENTS.md:L5-L5
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Not changing this here. The JavaScript side was deliberately split out when the line was planned and is tracked as JS IETF datagrams. No draft changes: this is moq-transport's own OBJECT_DATAGRAM, and a JS moq-transport subscriber behaves exactly as before (it never received datagrams). doc/concept/standard.md says JS doesn't carry them yet.
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| subscriber_request_id, | ||
| group_offset, | ||
| let (track, start, end, timescale, joined) = match msg.fetch_type { | ||
| FetchType::Standalone { |
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When a Rust relay needs a cached group from a JavaScript moq-transport publisher, the new standalone FETCH cannot be served: js/net/src/ietf/subscriber.ts still rejects one-shot group fetches and the JavaScript publisher handles only subscription fills. This leaves the newly added cache-miss path non-interoperable across the repository's two implementations, contrary to the scoped wire-sync rule, so the matching JavaScript request and serving paths need to land with this change. (Written by GPT-5.6 Sol)
AGENTS.md reference: rs/moq-net/AGENTS.md:L5-L5
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Not changing this here. JavaScript FETCH is its own planned quest, JavaScript FETCH. A Rust relay asking a JS publisher for a missed group gets a refusal, which is what it got before this PR. doc/concept/standard.md says JS publishing doesn't serve FETCH yet.
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Reviewed commit: 0effaaf
P2: Keep whole-group wire end locations separate from exclusive internal cursors. At subscriber.rs:3051–3059, a compliant upstream's FETCH_OK {group: g, object: 0} for the whole requested group is compared as an empty range and rejected with NotFound. Draft-16 §9.17 explicitly uses that representation for a complete requested group. The publisher has the inverse problem at publisher.rs:1337–1339: requesting through group 3/object 0 is internally normalized to 4/0, then advertised as covering all of group 4. Normalize the response's whole-group sentinel on receipt and convert internal bounds back before encoding. Add an external-format fixture returning {g,0}; the current Rust-to-Rust tests share the same mistaken convention.
Independent confirmations: the existing draft-20+ legacy FETCH emission, unbounded FETCH work/buffering, and datagram status/properties encoder validation findings are supported by the current code. No duplicate inline comments added. For the deferred draft-20 work, a local Unsupported guard is enough to keep this PR's stated 14–19 scope safe.
Direction: Keep the existing track model, midpoint priority mapping, and one-object datagram mapping. Reusing group fetches is appropriate; centralize wire-bound conversion and bound the buffered walk rather than expanding the transport model.
Verification: Full diff and surrounding FETCH, datagram, model, binding, and test code inspected against the relevant IETF drafts. No Rust/JS tests, benchmarks, or Moxygen interop ran; Cargo, rustc, Nix, just, and Bun are unavailable.
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Draft-17 on, only a Normal Object may carry Properties, and the decoder already rejects it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A range touching several groups is refused NOT_SUPPORTED, standalone or joining. On a relay the walk cost one serial upstream FETCH per missing group, all buffered until FETCH_OK. Ranges come back once relays fill upstream misses by range (subscribe-ranges). The hole-skipping walk, its span bench, and the model helpers only it used are deleted. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…EADME # Conflicts: # js/net/src/lite/track.test.ts
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Our FETCH codec still carries the Fetch Type field draft-20 removed, so a relay's upstream group fill sent a request a conforming draft-20 peer cannot decode. Both the publisher and the relay's group fill refuse it NOT_SUPPORTED until the Draft-20 FETCH quest serves LOCATION_FILTER. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Reviewed commit: d400ee1
Delta reviewed: the two commits after 0effaaf; no base-branch changes included.
Confirmed fixes: datagram.rs:101–107 now rejects non-Normal statuses with Properties on draft-17+, with regression coverage. publisher.rs:1214–1228 refuses multi-group FETCH before reading, removing the serial upstream walk and multi-group buffering. The hole-error finding is consequently moot.
No new independent regression found in this delta. Two previously reported wire issues remain:
- P2: The whole-group FETCH_OK finding still applies at subscriber.rs:3051–3059 and publisher.rs:1270. The revised test at publisher.rs:3850–3858 still asks for group 2 and expects the wire whole-group sentinel for group 3. Preserve the requested group in that sentinel, normalize it on receipt, and test against the draft-16 wire convention.
- P1: The draft-20+ legacy FETCH emission remains at subscriber.rs:3007–3028. Refuse locally on draft-20+ until its codec lands.
Direction: Keep the one-group simplification and deleted helpers; fix the wire boundary and version guard within that scope. No duplicate inline comments added.
Verification: Static review of both commits, surrounding FETCH/codec/model code, tests, and discussion. Tests and Moxygen interop were not run; Cargo, rustc, Nix, just, and Bun are unavailable here.
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| let datagram = ietf::ObjectDatagram::decode(&mut buf, self.version)?; | ||
| let (alias, sequence) = (datagram.track_alias, datagram.group_id); | ||
|
|
||
| if datagram.object_id.unwrap_or(0) != 0 { |
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When a peer sends Object 0 with END_OF_GROUP clear, this check accepts and publishes it as the model's single-frame datagram group, while a later Object 1 is dropped by the same check. That silently exposes a partial group for peers using multiple datagrams per group. Require datagram.end_of_group before mapping the object into Datagram, otherwise drop the unsupported group. (Written by GPT-5.6 Sol)
AGENTS.md reference: rs/moq-net/AGENTS.md:L8-L9
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Keeping this as is. END_OF_GROUP is optional in the drafts, and requiring it would drop every single-object datagram group from a peer that leaves it unset, which is the case this line set out to carry. A model datagram is a best-effort single frame, never read as a stream group, so there is no partial group for a reader to wait on. Multi-object datagram groups were scoped out when the line was planned; object 1+ is dropped as documented in doc/concept/standard.md.
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Reviewed commit: fd8c48d
The draft-20+ emission finding is fixed: subscriber.rs:2993–2997 rejects before allocating a request ID or opening/writing the legacy FETCH stream. publisher.rs:1130–1141 also refuses decoded requests on those versions. Version predicates, refusal tests, and documented support now agree on drafts 14–19.
No new independent finding in this delta. The prior P2 whole-group FETCH_OK boundary finding remains at subscriber.rs:3056–3064 and publisher.rs:1270: normalize a wire {g,0} whole-group sentinel on receipt and convert the internal exclusive cursor back before emission. No duplicate inline comment added.
Direction: Keep the conservative version guard and one-group scope. The guard fixes outgoing interoperability; a conforming draft-20 incoming FETCH still needs the separately tracked codec fix before it can reliably reach this clean refusal.
Verification: Separated the main merge (#4583/#4455) from the five-file FETCH fix and checked the merge's track-priority fixture resolution. Inspected surrounding request, response, and regression-test paths. Rust tests and Moxygen interop were not run; Cargo, Nix, and just are unavailable. Current-head Check/WASM/Platform workflows were still queued at review time.
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Actionable comments posted: 3
- 🪄 Fix CodeRabbit comments on this PR
🤖 Prompt to fix review comments
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Inline comments:
Review comments at @rs/moq-net/src/ietf/publisher.rs:
- Around line 1259-1270: Update the FETCH end-location logic around
`end_of_track` so a completed group that ends before the requested
object-bounded end reports `{group.sequence, group.end()}` rather than the
requested end. Keep the response’s end-of-track flag true only when the group is
actually the track’s final group.
Review comments at @rs/moq-net/src/ietf/subscriber.rs:
- Around line 3050-3053: In the FETCH_OK end-of-track handling, replace the
unchecked addition in `request.finish_track_at` with checked arithmetic. If
computing the final sequence overflows, reject the request with a protocol
violation, close the stream writer, and return before finishing the track.
- Around line 3086-3103: Add a deadline while waiting for the group fetch slot
to leave GroupFetch::Ready in the fetch handling flow. If it expires, take the
producer from the slot, abort it with Error::Timeout, close the writer, and
return; otherwise preserve the existing wait for GroupFetch::Done. Use the
existing runtime deadline mechanism and timeout constant where available.
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doc/concept/standard.mdjs/net/src/lite/track.test.tsquest/m1/README.mdquest/m1/ietf-fetch-location.mdrs/moq-net/src/fuzz.rsrs/moq-net/src/ietf/datagram.rsrs/moq-net/src/ietf/publisher.rsrs/moq-net/src/ietf/subscriber.rsrs/moq-tokio/tests/broadcast.rs
🚧 Files skipped from review as they are similar to previous changes (3)
- quest/m1/README.md
- quest/m1/ietf-fetch-location.md
- doc/concept/standard.md
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- A publisher that resets the request after FETCH_OK owes no fetch stream, so the accepted group is aborted instead of left open for every reader to wait on. - A peer's End Location at u64::MAX no longer overflows computing the track's final sequence; it refuses the fill. - A FETCH capped inside a still-open final group no longer claims End of Track: only a group read to its real end is complete. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Reviewed the three-file FETCH hardening commit 3b644be14fb4cc10dd3b92f2aa4dba8bbfdfe4bf, excluding the subsequent main-branch merge. No new independent finding in this delta.
Confirmed fixes: subscriber.rs:3050–3057 rejects final-sequence overflow; subscriber.rs:3100–3128 aborts an accepted group on request reset before its fetch stream claims it, while preserving the wait after FIN. publisher.rs:105–114 no longer mistakes a capped read of an open final group for completion.
P2 remains: the previous whole-group FETCH_OK boundary finding is unchanged at subscriber.rs:3061–3069 and publisher.rs:1268. Normalize the wire {g,0} sentinel before range comparison and convert the exclusive internal cursor back before emission. The new reset fixture also uses GROUP + 1 at subscriber.rs:7624–7627, so it does not cover a conforming whole-group response. Draft-19 §10.13 retains the request's whole-group encoding. No duplicate inline comment added.
Direction: Keep the one-group scope, draft-20+ guard, and reset-driven cleanup. Fix the remaining wire-boundary conversion within that scope.
Verification: Static review of the delta, surrounding handoff/reader paths, tests, and discussion. Rust tests and Moxygen interop were not run; Cargo, rustc, Nix, and just are unavailable. Current-head Check and WASM were still running, and Platform was queued.
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| }, | ||
| true, | ||
| ), | ||
| false => (end, false), |
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When a peer requests a bounded range whose end Object ID is past the actual end of a completed, non-final group, read_fetch stops with group.complete, but this branch still advertises the original requested end while sending only the existing frames. The receive path treats that End Location as a promise that every preceding object will arrive and rejects a clean FIN short of it, so this response is incompatible with the same implementation and can fail partial-range FETCHes from other peers. Return the actual group.end() or refuse the unsatisfied range when the group ends early. (Written by GPT-5.6 Sol)
AGENTS.md reference: rs/moq-net/AGENTS.md:L8-L9
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Keeping this, as decided in the #4276 review (r4114050992): when the range runs past a finished group's last object, FETCH_OK names the requested end, and the missing objects are a hole, like a missing group. It doesn't clash with our own receive path: our subscriber always asks for the whole group, so our publisher answers with an End Location past the group and the strict in-group end check never applies. That check covers a publisher that names an End Location inside a group it was asked for whole.
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Merging the moxygen line. Changes since ready for review
Declined, replies in thread
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Finishes the Moxygen compatibility questline: a moq-transport peer that speaks one subgroup per group, FETCH of whole groups, and one datagram per group gets those through the relay. A full moxygen moq-test pass stays out of scope.
Children
OBJECT_DATAGRAM, one object per group, sequence keptAlignment in this PR
ietf-subgroup-refusal(now m0) anddatagram-range(merged intodatagram-unfetchable) are deleted.fetch.md. That work moves to the new Draft-20 FETCH quest, blocked on m0ietf-legal-input, so the line lands now.signed-priorityis no longer blocked on it.Review follow-up: FETCH is one group
CodeRabbit flagged that a range FETCH on a relay costs one serial upstream FETCH per missing group, all buffered until FETCH_OK. Decided (maintainer): drop range support until relays fill upstream misses by range (the subscribe-ranges line on
dev). A standalone FETCH touching several groups, or a joining FETCH reaching back before its subscription's group, is refusedNOT_SUPPORTED. The hole-skipping walk (#4558), itsfetchbench, andtrack::Consumer::{next_cached, fetches_misses}are deleted.Review follow-up: FETCH is drafts 14 to 19
Codex found that our FETCH codec still encodes the Fetch Type field draft-20 removed, so a draft-20+ relay's upstream group fill sent a request a conforming peer can't decode. Both the publisher and the relay's group fill now refuse FETCH on draft-20+
NOT_SUPPORTED; Draft-20 FETCH lifts that after m0ietf-legal-inputfixes the codec.Declined (replied in thread): JS datagram and FETCH parity (already the
js-ietf-datagramandjs-fetchquests), and requiring END_OF_GROUP on a datagram (optional in the drafts; would drop single-object groups from peers that leave it unset).Public API / wire
OBJECT_DATAGRAM, and answer a standalone FETCH within one group and a joining FETCH for its subscription group's prefix, on drafts 14 to 19; a multi-group FETCH, or any FETCH on draft-20+, is refusedNOT_SUPPORTED. An unset track priority is 127 on moq-lite and 128 on IETF (was 0 and 255). No project draft changes.track::Info.prioritychanges to 127 (Rust, JS, and bindings docs).Follow-ups (already quests)
Checks:
quest check,just checkpass locally.(Written by Opus 5.5)
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