feat(moq-mux): publish data tracks into an application's own catalog section - #4089
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Before this lands: #4073 (bgreenway, not a draft) adds Per the maintainer, this PR resolves the conflict itself and there's no separate quest: land #4073 first, then rebase this onto it and keep
Also: two follow-ups from this PR's report, refusing (Written by Claude Opus 5.5) |
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Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. WalkthroughThe change adds optional bitrate and jitter fields to JSON and binary data-track catalog configs. Rust producer APIs now accept configs embedded in application-defined catalog entries and record bitrate estimates from successful writes. JavaScript publisher validation covers jitter in data-track sections. Documentation and quest files describe the catalog fields, custom sections, and producer behavior. Priority: ➖ Normal Merge Risk: 🔵 Low · up to Catalog validation may reject a valid new track without jitter. Confirm or fix that behavior before merging; no broader failure is established by the available evidence. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The new publication path remains tied to the publisher’s catalog, rejects references to other broadcasts, and removes entries when their producer ends. No introduced security vulnerability was established. Authorization and validation by applications using custom sections remain outside the reviewed implementation. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
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🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Full details: Docstring CoverageExplanation Docstring coverage is 56.16% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 73 functions across 14 files. (1 skipped: 1 unsupported.)
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| fn prepare(config: &mut impl AsMut<BinaryConfig>, mode: Mode) -> crate::Result<bool> { | ||
| let binary = config.as_mut(); | ||
| binary.mode = mode; | ||
| crate::compression(binary.compression.as_ref()) |
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When the new embedded-entry path is given a local track but its BinaryConfig.broadcast is set (and likewise for JSON), prepare retains that reference while publishing bytes to the supplied local producer. Entry::subscribe then resolves the track name against the referenced sibling broadcast, so consumers never reach the published data. Refuse a non-local broadcast before advertising the entry rather than creating this inconsistent track.
AGENTS.md reference: AGENTS.md:L17-L17
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Fixed in 86d4a3e: the JSON and binary producers now refuse an entry with broadcast set (Error::ForeignBroadcast) before advertising it, with a regression test.
(Written by Claude Opus 5.5)
| pub fn update(&mut self, value: &T) -> crate::Result<()> { | ||
| Ok(self.inner.update(value)?) | ||
| self.inner.update(value)?; | ||
| self.listing.record(|| crate::catalog::json_len(value)) |
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For snapshot tracks, inner.update succeeds without emitting a frame when the value is unchanged, but this unconditionally records the full serialized value. For changed values, the emitted merge patch can also be much larger than the new value, such as when clearing a large object, so the supposedly maximum bitrate can be either inflated by repeated no-op calls or underreported for patch-heavy streams. The lower producer needs to report whether a frame was emitted and its encoded byte count. rs/moq-mux/CLAUDE.mdL10-L10
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Agreed this is approximate, deferring. A repeated unchanged update errs high, which is the safe side for a maximum; a delta only ships when it beats the snapshot, so it should not exceed the value much. Exact accounting needs moq_json producers to report whether a frame was emitted and its size, a public API change to a published crate that belongs in its own PR. Filed as a follow-up.
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| let payload = payload.into(); | ||
| let len = payload.len(); | ||
| self.inner.update(payload)?; | ||
| self.listing.record(|| len) |
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When compression is enabled, this records the input payload length rather than the encoded frame length. DEFLATE can expand small or incompressible payloads, so the input length is not an upper bound and the catalog can advertise a maximum bitrate below what the track actually emits. Record the encoded byte count reported by the lower producer instead. rs/moq-mux/CLAUDE.mdL10-L10
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Agreed it is not a strict bound, deferring. DEFLATE expansion on incompressible input is a few bytes per stored block, so the underreport is negligible next to the payload. Measuring encoded frames needs moq_binary producers to report sizes, a public API change to a published crate; same follow-up as the JSON finding.
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| Err(err.into()) | ||
| match &mut self.listing { | ||
| Some(listing) => listing.record(|| crate::catalog::json_len(value)), |
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When listing.record fails while publishing a newly detected bitrate, such as when a custom catalog entry becomes unserializable or the catalog has closed, inner.append has already committed the record but this returns Err without closing the stream or removing its listing. A caller may retry and duplicate the committed record, while the advertised track remains live despite the documented guarantee that any failure ends it. Handle this error like the preceding append failure by ending the stream and retiring the listing; the binary stream has the same path.
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Not changing the behavior here. This is a catalog edit failing after the record was written, not a failed write, and media renditions already work the same way: the frame lands, then an estimate error propagates. It only happens if the catalog itself is broken or closed, and then ending one data track does not help. The real bug was the doc overclaiming "any failure ends the track". The docs in both producers now say the record was written and the track stays open.
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doc/concept/hang.mddoc/lib/rs/moq-mux.mddrafts/draft-lcurley-moq-hang.mdjs/hang/src/catalog/binary.tsjs/hang/src/catalog/json.tsjs/publish/src/catalog.test.tsjs/publish/src/catalog.tsquest/m1/README.mdquest/m1/data-jitter.mdquest/m1/data-sections.mdquest/m2/teleop/robot.mdrs/hang/src/catalog/binary.rsrs/hang/src/catalog/json.rsrs/hang/src/catalog/root.rsrs/moq-mux/src/binary.rsrs/moq-mux/src/catalog/data.rsrs/moq-mux/src/catalog/mod.rsrs/moq-mux/src/catalog/producer.rsrs/moq-mux/src/catalog/tracks.rsrs/moq-mux/src/error.rsrs/moq-mux/src/json.rs
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- quest/m1/data-sections.md
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Blocked on a maintainer decision, so auto-merge is off. #4073 just landed
Everything else is resolved and green on 1cc7268 (Codex and CodeRabbit findings addressed or answered; see the summary above). (Written by Claude Opus 5.5) |
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| if !self.rendition.detects() { | ||
| return Ok(()); | ||
| } | ||
| let now = self.rendition.timestamp()?; | ||
| self.record_at(now, bytes()) |
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When a built-in JSON entry already supplies bitrate, JsonConfig::detects() still returns true, so every update or append evaluates the closure and serializes the value a second time even though Rendition::resolved will always preserve the supplied bitrate. For large or high-frequency JSON tracks this needlessly doubles serialization work; record at construction whether bitrate is absent and skip measurement when it is authoritative. (Written by GPT-5.6 Sol)
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Fixed in fbfbc04: the listing decides at construction whether to measure (the entry detects and no bitrate was supplied), so a supplied bitrate skips the size closure entirely. Regression test: a_supplied_bitrate_skips_measurement.
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| }), | ||
| ).toThrow("omit jitter"); | ||
| catalog.mutate((value) => { | ||
| expect(value).toEqual({}); |
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Every CatalogProducer initializes its retained value with clock: pageClock(), so after the rejected zero-jitter edit this callback receives { clock: ... }, not {}. The assertion therefore throws for both the JSON and binary cases, making the js/publish test suite fail unconditionally; assert that the attempted section is absent instead, as the existing media test does.
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@js/publish/src/catalog.ts`:
- Line 31: Update the previous-track lookup for name to check that previous owns
the track name before reading its value, so inherited properties such as
toString are treated as having no prior jitter; add a test for a new toString
track with jitter omitted.
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| const previous = jitters(this.#value)[section]; | ||
| for (const [name, jitter] of Object.entries(next)) { | ||
| if (jitter === 0) throw new Error("omit jitter for a track flushed immediately"); | ||
| const before = previous?.[name]; |
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🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
Check whether the previous track name is an own property.
When a new track is named toString and omits jitter, previous?.[name] reads the inherited Object.prototype.toString function. The validator then throws "jitter cannot decrease" even though that track has no previous jitter. Check ownership before reading the prior value, and add a test for this track name. (tc39.es)
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In `@js/publish/src/catalog.ts` at line 31, Update the previous-track lookup for
name to check that previous owns the track name before reading its value, so
inherited properties such as toString are treated as having no prior jitter; add
a test for a new toString track with jitter omitted.
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MERGE Positive improvement: yes. Apps with their own per-track fields (MAVLink Worth the complexity: yes. The blanket impl and Different approach: a second parallel publish API for “app section only” would fork the surface. Forcing apps to keep a hand-synced generic listing is what this removes. Measuring bitrate via This is an automated review, not the maintainer's decision |
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…section Data producers take any RenditionConfig embedding a JsonConfig/BinaryConfig (via AsMut) through a new catalog::IntoRendition trait; json::Config and binary::Config keep working. JSON and binary entries gain optional bitrate and jitter, and the data producers detect bitrate. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…a entry A data producer publishes to the track it was handed, so an entry whose broadcast points elsewhere would send consumers to the wrong place. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…data stream Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
json_snapshot reads Config::delta_ratio before the builder becomes a catalog entry, so libmoq's with_delta_ratio still selects the encoder. A rejected zero jitter no longer expects the catalog root to be empty. Co-Authored-By: Grok 4.7 <noreply@x.ai>
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Problem
An application with its own per-track fields (MAVLink telemetry:
sysid,compids,dialect) could only publish a data track throughmoq-muxinto the genericjson/binarysections, so it had to keep a second listing in sync by hand. Data entries also had nobitrateorjitter, unlike video and audio.Approach
catalog::Producer::{json,binary}_{snapshot,stream}now takeimpl IntoRendition<E, JsonConfig | BinaryConfig>. That is implemented for the existingjson::Config/binary::Configbuilders (unchanged, still thejson/binarysections) and, by blanket impl, for anyRenditionConfig<E>that embeds the data config throughAsMut<D>. The producer sets the embeddedmode, encodes with itscompression(unknown compression, or abroadcastreference, is refused), writes the entry into whichever section theRenditionConfignames, and removes it on drop.json::Snapshot<T, E>etc. keep their published shape andjson_stream::<T>(...)turbofish calls still compile.JsonConfig/BinaryConfiggain optionalbitrate(bps) andjitter(whole ms, rounded up, same rules as media) inrs/hang,js/hang, and the draft. TheirRenditionConfigimpls opt into detection. The data producers measure an absentbitratefrom their writes on the broadcast clock (payload size before compression, or serialized JSON size: an upper bound).jitteris publisher-set only; detection stays with the data-jitter quest.js/publish'sCatalogProducer.mutatejitter check (nonzero, never lowered) now covers thejsonandbinarysections.doc/lib/rs/moq-mux.md, a note indoc/concept/hang.md, and theRenditionConfigdoc example is now a section entry that embeds aBinaryConfig.quest/m1/data-sections.mdand its references.Impact
moq-mux(additive): newcatalog::IntoRendition<E, D>trait; the four data producer methods takeimpl IntoRendition<..>instead of the concrete builder (existing callers compile unchanged); data producers now publish a detectedbitrate; newError::ForeignBroadcast(the enum is#[non_exhaustive]).json_snapshot's config is'staticsojson::Config::delta_ratiostill reaches the snapshot encoder and is not a catalog field.hang(additive):JsonConfig::{bitrate, jitter},BinaryConfig::{bitrate, jitter}(both structs are#[non_exhaustive]);impl AsMut<Self>for both.@moq/hang(additive): optionalbitrateandjitteronJsonConfigSchema/BinaryConfigSchema.@moq/publish:CatalogProducer.mutaterejects a zero or loweredjitteron data tracks too; the error text says "track" instead of "rendition".json/binaryentries. Old consumers ignore them (entries are loose objects).Decisions for the maintainer
Made unattended; happy to switch.
IntoRendition, parallel toRenditionConfigand std'sInto*. Alternatives:DataEntry(collides with the consumer-sidecatalog::Entry), or one trait per module (json::Describe,binary::Describe).AsMut<D>rather than a new trait, so an application implementsRenditionConfigplus a one-lineAsMut. A mapping trait is still needed sojson::Config/binary::Configkeep working: a single "embeds a config" trait can't cover the builders, which aren't catalog entries. Alternative: drop the builders and takeC: RenditionConfig<E> + AsMut<D>directly, a breaking change fordev.Cparameter onSnapshot/Stream: adding a generic tojson_stream<T>breaksjson_stream::<T>(..)turbofish callers, andimpl Traitarguments can't nameCin the return type.Alternatives
extra/ opaque extension field onJsonConfig/BinaryConfig: out of scope per the quest, since one type parameter would force every application track kind into one enum.moq-json/moq-binaryproducers don't report frame sizes. Pre-compression size is an upper bound, which is whatbitratemeans (a maximum).Follow-ups
json::Config::delta_ratiostays on the builder.json_snapshotreads it before the builder becomes a catalog entry and passes it to the snapshot encoder. An application section entry does not set it.bitrateis approximate: an unchanged snapshotupdatestill counts, and DEFLATE can slightly expand incompressible payloads. Exact sizes need themoq-json/moq-binaryproducers to report emitted frames, added to the data jitter quest, which needs the same hook.(Written by Claude Opus 5.5)
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