fix(net): stop blocking connect on the initial announce set - #2856
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connect() waited for the peer's initial announce set (ANNOUNCE_INIT on lite-01/02, ANNOUNCE_OK's Active Count on lite-05+). The only thing that bought was making request_broadcast correct for a caller that connects and immediately resolves a known path, and nothing needs it: every moq-cli entry point already awaits announced_broadcast first, moq-ffi exposes both and documents that request_broadcast does not wait, and origin::Dynamic's consumers serve local origins with no announcements to race. That made it a policy moq-net should not hold. It decided how long to wait for a peer, overrode an explicit --client-connect-timeout 0, and let a peer that over-reported its count hold connect() for the life of the session. The wire is unchanged: the subscriber still decodes ANNOUNCE_OK for the peer's origin id, and Active Count stays specified for implementations that want it. We just stop counting it. Two call sites leaned on the block and are fixed here: `moq transcode` spun on session status and then raced the announcement, and cluster_unknown did connect-then-request_broadcast. Both now await announced_broadcast, which is the explicit way to resolve a path right after connecting. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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| return Ok(Session::new( | ||
| session, | ||
| version.into(), | ||
| start.recv_bandwidth, | ||
| start.driver, | ||
| )); |
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When running rs/moq-transcode/examples/transcode.rs against a Lite peer, this now lets Reconnect report Status::Connected before the initial announcements arrive, but that example still immediately calls request_broadcast at lines 51-60. It can therefore fail with Unroutable and exit even when the configured source is live. Update the example to wait for announced_broadcast, as the parallel moq transcode implementation now does. (Written by GPT-5.6 Sol)
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WalkthroughConnection startup now returns the session and driver without waiting for initial announcements. Lite connection-progress tracking and 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches✨ Simplify code
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In `@rs/moq-net/src/client.rs`:
- Around line 660-663: Extend the Lite05 client test to have the peer send
AnnounceOk with active greater than zero without sending an Active frame, then
assert Client::connect completes immediately after the handshake. Ensure the
test would hang or fail if connect still waited on the initial announce count,
while preserving the existing driver-polling coverage.
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doc/lib/py/moq-rs.mdrs/moq-cli/src/transcode.rsrs/moq-ffi/src/origin.rsrs/moq-net/src/client.rsrs/moq-net/src/lite/connecting.rsrs/moq-net/src/lite/mod.rsrs/moq-net/src/lite/session.rsrs/moq-net/src/lite/subscriber.rsrs/moq-net/src/model/origin.rsrs/moq-net/src/session.rsrs/moq-relay/tests/cluster_unknown.rs
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- rs/moq-net/src/lite/mod.rs
- rs/moq-net/src/lite/connecting.rs
The standalone transcoder example carries the same connect-then-request pattern the CLI verb did, so it races the announcement now that connect() returns without waiting for the initial announce set. Also pins the new contract with a regression test: a peer that opens the announce stream and never answers must not hold connect(). It fails against the previous behavior, which waited for an initial set that never arrived. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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| .announced_broadcast(&source_path) | ||
| .await |
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When authentication is rejected or reconnect exhausts its retry budget before the source is announced, this await never resolves: remote remains owned by run, so its consumer stays open even after Reconnect terminates. The previous session.status().await? surfaced that terminal error, but now neither this startup path nor the identical wait in rs/moq-transcode/examples/transcode.rs observes session.closed() until after obtaining the source. Race the announcement wait against reconnect closure so the command returns the actual connection error. (Written by GPT-5.6 Sol)
AGENTS.md reference: AGENTS.md:L115-L115
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The OBS source starts consuming from its session-connected callback, where it called moq_origin_request: resolve against what is announced *now*, failing if nothing can serve the path. Announcements arrive over the session after it connects, so with connect() no longer waiting for the initial announce set that races, and losing the race blanks the source. Nothing retries, since consumption is started only for connection epoch 1, so OBS stays blank until the user restarts it. moq_origin_consume_announced is the same call that waits for the announcement, with an identical callback contract; its doc recommends it for exactly this position. Swapped, along with the two close sites. Uncompiled: `just obs build` needs `just obs setup` to download obs-deps, and PR CI never builds the plugin. The change is a swap between two libmoq functions whose generated C signatures are identical, verified against target/include/moq.h. Test coverage for this path is tracked in #2860. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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In `@cpp/obs/src/moq-source.cpp`:
- Around line 701-708: Update the catalog-setup failure path using
moq_source_abort_consume_locked so it closes and clears ctx->request before
closing ctx->origin, allowing the request’s terminal callback to release its
retained reference and preventing on_broadcast from running on an aborted
consume context.
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cpp/obs/src/moq-source.cpp
| // Wait for the broadcast to be announced. This runs off the session-connected | ||
| // callback, and announcements arrive over the session after it connects, so | ||
| // resolving against only what is announced *now* (moq_origin_request) would race | ||
| // them and blank the source for a broadcast that is live. libmoq copies the path, | ||
| // so it need not outlive this call, and delivers the broadcast handle | ||
| // asynchronously to on_broadcast. | ||
| int32_t request = moq_origin_request(origin, broadcast_copy, strlen(broadcast_copy), on_broadcast, req); | ||
| int32_t request = | ||
| moq_origin_consume_announced(origin, broadcast_copy, strlen(broadcast_copy), on_broadcast, req); |
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🩺 Stability & Availability | 🟡 Minor | ⚡ Quick win
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Cancel ctx->request when catalog setup fails.
moq_source_abort_consume_locked closes ctx->origin, but moq_origin_close does not cancel the pending consume_task. A pending task can retain ctx and later call on_broadcast after the consume path has been aborted. Close and clear ctx->request, then let its terminal callback release the request reference.
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In `@cpp/obs/src/moq-source.cpp` around lines 701 - 708, Update the catalog-setup
failure path using moq_source_abort_consume_locked so it closes and clears
ctx->request before closing ctx->origin, allowing the request’s terminal
callback to release its retained reference and preventing on_broadcast from
running on an aborted consume context.
Adversarial review summary (Codex)Fixed
Filed
Checked and clear Every other in-tree Caveat The OBS change is uncompiled. (written by Opus 5) |
Waiting for the source announcement dropped the error the old `session.status().await?` propagated. The origin outlives the session here, so the wait itself never fails: a rejected token or an exhausted retry budget left the command waiting for an announcement that could never arrive. Race it against the session ending so the real connection error is what comes back. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Resolves 27 conflicts from the 11 commits `main` gained since moq-dev#2852. The non-mechanical ones: **Catalog broadcast references.** Two independent changes, both kept. main moq-dev#2855 changed the *resolution algorithm* to relative-URL semantics (a non-empty reference replaces the base's last segment, then `.`/`..` apply); dev moq-dev#2630 changed *escape handling* to reject the whole catalog. main already ships both `resolve` (clamping) and `try_resolve` (`Option`), so its `path.rs` is taken wholesale and dev's callers point at `try_resolve`. This shifts what escapes by one segment, which is why several tests move from `../x` to `./x`. The escape policy is two-sided rather than one choice. main's `retain_valid`/`resolve_reference` is publisher-side sanitisation with 9 call sites across moq-mux, moq-hls, and moq-rtc: kept. dev's `EscapingBroadcast` plus `Source::target` returning `Result` is consumer-side rejection: also kept, now layered on `try_resolve`. main's duplicate `InvalidBroadcastReference` variant is dropped for dev's better-documented `EscapingBroadcast`. `Source` grows a `request`/`try_request` pair mirroring `resolve`/`try_resolve`, so the exporters keep skipping one bad rendition while consumers keep reporting the fault. `js/watch` is a pure consumer, so it takes the reject policy alone; main's `filterCatalog` is dropped (it also missed the `text` section). Its `findEscaping` had to move to `Path.tryResolve`, since main's `resolve` clamps and would have silently disabled the check. **`Connecting` removal.** main moq-dev#2856 deletes the mechanism; dev had rewritten the same thing into its poll driver (`SubscriberDriver`, `AnnouncePrefix`, 27 references). main's removal wins, applied on top of dev's driver: the per-prefix producer, the `initial_count`/`initial_remaining` bookkeeping that existed only to release it, and the `client.rs` wait sites all go, keeping dev's `goaway` plumbing. **Fixes carried across a rewrite.** main moq-dev#2862's live-edge cursor fix landed in an async `run_track` that dev deleted, so it is reapplied to dev's poll-based `TrackServe::new`; its regression test now drives that. main moq-dev#2841's WebSocket `SessionInputs` refactor gains dev's `shutdown` field. main moq-dev#2874's target-carrying `DialSources` gains dev's mDNS source, and `run_mdns` moves to `upsert`/`release` (dev's 2-arg `release` was superseded). The hang draft and docs state main's URL resolution semantics *and* dev's reject-the-catalog rule. `just check` and `just test` pass: 3185 tests, 0 failures. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Closes #2836.
Summary
connect()blocked until the peer's initial announce set landed (ANNOUNCE_INITon lite-01/02,ANNOUNCE_OK'sActive Counton lite-05+). The only thing that bought was makingorigin::Consumer::request_broadcastcorrect for a caller that connects and immediately resolves a known path. Nothing needs it:moq export(main.rs:377),moq rtc(rtc.rs:100) andmoq play(play.rs:183) already awaitannounced_broadcastbefore resolving a path.playopts out ofrequest_broadcastexplicitly and its comment says the wait is the whole point.moq-ffiexposes both and documents thatrequest_broadcast"does not wait".origin::Dynamic's consumers serve local origins, where there are no session announcements to race, and they depend onrequest_broadcastfailing promptly.The consumer that would have justified it was #2762, closed unmerged. So the block was a policy
moq-netshouldn't hold: it made the library decide how long to wait for a peer, silently overrode--client-connect-timeout 0("wait forever"), and let a peer that over-reported its count holdconnect()for the life of the session. That last part is #2836, which this deletes rather than fixes.announced_broadcastis the explicit wait, and it is the answer to "resolve this path right after connecting".Changes
lite::Connecting,Driver::wait_ready,SessionStart::connecting, and the fourwait_readycall sites inclient.rs.ANNOUNCE_OKfor the peer's origin id, so the wire is unchanged andActive Countstays specified in lite-06 for implementations that want it. We just stop counting it, and theinitial_remainingcountdown goes.moq transcodewas the one caller leaning on the block: it spunwhile !matches!(session.status(), Connected)and then calledrequest_broadcast, which races the announcement. Now awaitsannounced_broadcastfirst, like every other CLI path.rs/moq-relay/tests/cluster_unknown.rsdidconnect()thenrequest_broadcastand would race deterministically. Same fix.origin::Consumer::announced_broadcastno longer claimsconnect()blocks (it said so explicitly),moq-ffi's two methods name the post-connect race, anddoc/lib/py/moq-rs.mdgains a paragraph. The other language wrapper docs don't cover this API.Consumers fixed
Three in-tree callers resolved a path straight after connecting and would now race the announcement. All three switch to
announced_broadcast(or its C equivalent):moq transcodeandrs/moq-transcode/examples/transcode.rs, which both spun on session status and then calledrequest_broadcast.rs/moq-relay/tests/cluster_unknown.rs.cpp/obs/src/moq-source.cpp), which calledmoq_origin_requestfrom its session-connected callback. Losing that race blanks the source, and nothing retries: consumption starts only for connection epoch 1. Swapped tomoq_origin_consume_announced, which waits for the announcement and whose doc recommends it for exactly this position.Waiting for an announcement drops the error the old
session.status().await?propagated, since the origin outlives the session and the wait itself cannot fail. Both transcode paths therefore race it againstReconnect::closed(), so a rejected token or an exhausted retry budget returns the real connection error instead of waiting for an announcement that can never arrive.Every other
request_broadcast/Source::newcaller was checked and already gates onannounced_broadcast(moq export,moq play,moq rtc,moq rtmp,moq-srt), resolves per HTTP request long after connect (moq-hls), or runs against a local origin with no session to race (moq-cli/publish.rs,moq-ffitests).The OBS change is uncompiled:
just obs buildneedsjust obs setupto download obs-deps, and PR CI never builds the plugin. It is a swap between two libmoq functions whose generated C signatures are identical, verified againsttarget/include/moq.h.moq-source.cpphas no test coverage at all today, tracked in #2860.Behavior change
moq_net::Client::connectreturns as soon as the handshake completes instead of also waiting for the first announcements. An embedder doing connect-then-request_broadcaststarts racing, with no compile error; the failure reads as "broadcast unavailable" for a broadcast that exists. The docs above are the mitigation. In-tree callers are all fixed here.Not a semver break: no
pubitem is renamed, removed, or resignatured, so this targetsmainper CONTRIBUTING.Public API changes
None.
Connecting/ConnectingProducerwerepub(crate),liteis a private module, andDriver::wait_readywaspub(super).Test plan
just check/just test.cluster_unknownis the regression test for the racy pattern: it exercises connect-then-resolve against a relay and now waits for the announcement explicitly.client::tests::*_falls_back_to_draft14_*tests timed out on the first run and are fixed here rather than adjusted away: they bound the result ofconnect()and waited for the transport to close, relying onwait_readypolling the driver as a side effect.connectno longer polls it, and the documented contract is that the session makes no progress unless the driver is, so they now spawn it. That is the same observable change an embedder sees.connect_does_not_wait_for_the_peer_to_announcepins the new contract: a peer that opens the announce stream and then never answers must not holdconnect(). Verified to fail against pre-fixmain(connect waited on a peer that never announced: Elapsed(())) and pass here.Review
Reviewed adversarially by Codex (
/pr-review), which caught the OBS regression above (a first-party consumer in code PR CI never compiles) and, on a later pass, the dropped connection error in the transcode paths. Also fixed from review: themoq-transcodeexample, and the missing regression test. Filed #2860 for the absentmoq-source.cpptest coverage that let the OBS break through.One AI finding was rejected: that
moq_source_abort_consume_lockedleaves a pendingconsume_taskable to call back after the abort.run_consume_announcedreturns as soon as it delivers the handle, so at the only site where a wait is still live (the catalog-setup failure) the task self-terminates and its terminal fires immediately, which the generation check already handles. The shape is also unchanged frommoq_origin_request, so it is neither new nor a leak.Note for the next person touching
moq transcode: it is feature-gated, sojust check(default features only) never compiles it. Verified here withcargo clippy -p moq-cli --features transcode --all-targets -- -D warnings.(Written by Opus 5)