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feat(net): carry broadcast epochs over moq-transport - #5932
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Adds the MoQ Epoch extension (draft-lcurley-moq-epoch): a SETUP option and an EPOCH parameter on PUBLISH_NAMESPACE, NAMESPACE, SUBSCRIBE, FETCH, and TRACK_STATUS, negotiated on drafts 17-22 in Rust and JS. Paths are unchanged and epochless peers keep their wire. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Quest outcome for This PR stays a draft until the maintainer confirms the six open decisions in the description. Each one is implemented as recommended. Checks that passed:
(Written by Claude Opus 5.5) |
An epoch change no longer shows the namespace offline. On PUBLISH_NAMESPACE the new epoch is advertised, and the old request withdrawn only once the peer answers it; on a SUBSCRIBE_NAMESPACE stream a NAMESPACE under another epoch replaces the live one with no NAMESPACE_DONE. Gaining or losing an epoch, and any change toward a peer without MoQ Epoch, still withdraws first. A NAMESPACE repeat is a protocol violation only when it adds or drops an EPOCH. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
# Conflicts: # js/net/src/ietf/connection.ts
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Recording the maintainer's answers to the six decisions:
The draft's Advertising and downgrade sections were updated to match, and the change is implemented in Rust and JS for both sending and receiving. Mocked-time regression tests fail without it: (Written by Claude Opus 5.5) |
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# Conflicts: # js/net/src/ietf/subscriber.ts
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WalkthroughThe change adds MoQ Epoch support to JavaScript and Rust MoQ Transport implementations. Supported sessions negotiate the extension and carry UUIDv7 epochs in namespace advertisements and selected requests. Publishers resolve requests against the specified instance. Subscribers track multiple advertisements per namespace and propagate the selected epoch. The change also updates compatibility tests, protocol documentation, configuration examples, and links to the Epoch draft. Priority: ➖ Normal Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation |
|---|---|---|
| Description check |  |
The description clearly explains the MoQ Epoch extension, its protocol behavior, implementation scope, tests, documentation updates, and follow-up items. It directly matches the changeset. |
| Title check | |
The title clearly and concisely identifies the main change: carrying broadcast epochs over moq-transport. |
| Docstring Coverage | |
Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 130 functions across 43 files. (15 skipped:… |
| 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. |
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Explanation
Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 130 functions across 43 files. (15 skipped: 13 unsupported, 2 too large.)
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# Conflicts: # rs/moq-net/src/ietf/subscriber.rs
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A namespace advertised both inline and by a later PUBLISH_NAMESPACE kept routing to the request's old instance when the inline NAMESPACE repeated under a new epoch, since the repeat updated the older entry in place. It now moves to the tail, while a same-instance repeat still re-prices in place. JS also skips a closed announce consumer when the newest advertisement changes, as the end path already did. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A NAMESPACE that loops back through us detaches its route but stays advertised until its NAMESPACE_DONE, so a later repeat that gains or loses an EPOCH is still refused. The stream now tracks each suffix's epoch apart from its attached route. The epoch draft gains its moq-epoch-00 changelog. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Codex Review: Didn't find any major issues. 🚀 Reviewed commit: ℹ️ About Codex in GitHubYour team has set up Codex to review pull requests in this repo. Reviews are triggered when you
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Actionable comments posted: 2
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Inline comments:
Review comments at @js/net/src/ietf/publisher.ts:
- Line 472: Update the subscribe failure handling near `#resolve` so `#failed`
receives rendezvous only when `msg.epoch` is undefined; preserve the existing
refusal behavior for unpinned subscriptions.
Review comments at @rs/moq-net/src/ietf/publisher.rs:
- Around line 1190-1194: Update the error handling for `request_broadcast` so
`rendezvous_error` receives rendezvous enabled only when `msg.epoch` is absent;
epoch-pinned requests for a gone instance must be refused as missing rather than
treated as timeouts.
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📒 Files selected for processing: 63
doc/bin/cli.mddoc/bin/gstreamer.mddoc/bin/relay/cluster.mddoc/bin/relay/config.mddoc/concept/moq-lite.mddoc/concept/standard.mddoc/concept/stats.mddoc/setup/upgrade.mddrafts/draft-lcurley-moq-cluster.mddrafts/draft-lcurley-moq-epoch.mdjs/net/src/connection/accept.tsjs/net/src/connection/connect.tsjs/net/src/connection/extensions.test.tsjs/net/src/connection/extensions.tsjs/net/src/connection/handshake.tsjs/net/src/ietf/aliases.test.tsjs/net/src/ietf/aliases.tsjs/net/src/ietf/cluster.test.tsjs/net/src/ietf/cluster.tsjs/net/src/ietf/connection.tsjs/net/src/ietf/epoch.test.tsjs/net/src/ietf/epoch.tsjs/net/src/ietf/fetch.tsjs/net/src/ietf/index.tsjs/net/src/ietf/parameters.tsjs/net/src/ietf/publish_namespace.tsjs/net/src/ietf/publisher.test.tsjs/net/src/ietf/publisher.tsjs/net/src/ietf/subscribe.tsjs/net/src/ietf/subscribe_namespace.tsjs/net/src/ietf/subscriber.test.tsjs/net/src/ietf/subscriber.tsjs/net/src/ietf/track.tsquest/m0/broadcast-epoch/README.mdquest/m0/broadcast-epoch/catalog-references.mdquest/m1/README.mdquest/m1/claim-answer-epochs.mdquest/m1/ietf-epochs.mdquest/m1/ietf-takeover.mdquest/m3/ietf-cluster-peers.mdrs/moq-net/src/fuzz.rsrs/moq-net/src/ietf/adapter.rsrs/moq-net/src/ietf/epoch.rsrs/moq-net/src/ietf/fetch.rsrs/moq-net/src/ietf/mod.rsrs/moq-net/src/ietf/parameters.rsrs/moq-net/src/ietf/peer.rsrs/moq-net/src/ietf/publish_namespace.rsrs/moq-net/src/ietf/publisher.rsrs/moq-net/src/ietf/session.rsrs/moq-net/src/ietf/subscribe.rsrs/moq-net/src/ietf/subscribe_namespace.rsrs/moq-net/src/ietf/subscriber.rsrs/moq-net/src/ietf/track.rsrs/moq-net/src/ietf/version.rsrs/moq-net/src/setup.rsrs/moq-net/src/test_interop.rsrs/moq-net/tests/integration/catalog_acquisition.rsrs/moq-net/tests/integration/extensions.rsrs/moq-net/tests/integration/multi_cdn.rsrs/moq-net/tests/integration/replacement.rsrs/moq-net/tests/integration/restart.rsrs/moq-net/tests/integration/route_change.rs
💤 Files with no reviewable changes: 5
- quest/m3/ietf-cluster-peers.md
- quest/m1/ietf-epochs.md
- quest/m1/README.md
- quest/m1/ietf-takeover.md
- js/net/src/ietf/cluster.ts
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An instance never comes back, so RENDEZVOUS_TIMEOUT on a request pinned to a gone one is refused DOES_NOT_EXIST, as the epoch draft says, not TIMEOUT. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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@codex review (Written by Claude Opus 5.5) |
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Codex Review: Didn't find any major issues. Bravo. Reviewed commit: ℹ️ About Codex in GitHubYour team has set up Codex to review pull requests in this repo. Reviews are triggered when you
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Main completed and deleted quest/m1/ietf-epochs.md (#5932); this branch had only dropped a Related link from it, so the deletion stands. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Summary
Adds the MoQ Epoch extension (
drafts/draft-lcurley-moq-epoch.md), which carries moq-lite's broadcast epoch over moq-transport drafts 17 through 22 without changing a path. It is implemented in Rust (moq-net) and JS (@moq/net), and finishes thequest/m1/ietf-epochs.mdquest.EPOCH(0x40B68). The extension is used only when both sides offer it, and it is on by default.EPOCH(0x40B69) holds the publisher's 16-byte UUIDv7. It appears on:restart::dynamic_epoch_ietf{19,22}runs P to R to V over SUBSCRIBE_NAMESPACE. V now sees a single restart between two epochs, with no end in between.another_epoch_is_advertised_before_the_old_is_withdrawnchecks the PUBLISH_NAMESPACE path. The new request goes out before the old one is cancelled, and a non-negotiated peer still sees the cancel first.Overlap with #5678 (claim-answer-epochs): there is no duplicated feature, since that PR consumes these epochs. The two PRs will likely conflict textually in
rs/moq-net/src/ietf/{publisher,subscriber}.rs.Public API
moq_net::setup::Extensionsgainsepoch: bool, defaulting to true. The struct is#[non_exhaustive], so the addition is not breaking.Extensionsgainsepoch?: boolean, defaulting to true.Wire
Decisions
The maintainer settled these.
draft-lcurley-moq-epoch. This is a separate extension draft rather than a section of moq-cluster, so that a non-cluster peer can implement it on its own. ✅ Keep.Follow-ups
{{epoch}}from the cluster draft.Checks
just rs check-test-changedbun testjust drafts checkjust test interop --allquest checkjust checkNo benchmark was added. No fanout path changed, and the per-path advert list holds the routes for one path.
(Written by Claude Opus 5.5)
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