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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
… one deadline (#4138) Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
…in Rust (#4143) Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com> Co-authored-by: Grok 4.7 <noreply@x.ai>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
# Conflicts: # doc/lib/js/net.md # js/net/src/ietf/adapter.ts # js/net/src/ietf/connection.ts # js/net/src/lite/connection.ts # js/net/src/origin.test.ts # js/net/src/origin.ts # rs/moq-ffi/src/binary.rs # rs/moq-relay/src/internal.rs # rs/moq-relay/tests/shutdown_signal.rs
The drain now ends once every counted session leaves (#4186), so the io_uring drain test raced its own relay: a lite-06 client sees its session before the relay counts it, the trigger found nothing to wait for, and the relay exited before sending a GOAWAY. Hold a moq-lite-03 straggler as shutdown_signal.rs does, and trigger only once the relay lists both sessions. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
…ped group Completes the drain line: `just test drain` stands up relay B with a publisher and relay A clustered to it, points a stand-in for DNS at A, and has a @moq/net viewer watch the track through it. The driver then withdraws A from the name, sends it SIGTERM, and requires the viewer to read fresh groups on B within the handover window with none missing, to dial A only once, and A to exit on its own once every session left. Runs nightly. 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>
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The maintainer requires the drain e2e to pass with no latency budget before the line completes. Restore the line with one child, JS group-boundary handover, which flips test/drain to zero budget; the transport upgrade's JS half now requires it. Add two m1 follow-ups: drain in-flight handshakes, and run the io_uring tests on a 6.12+ self-hosted runner. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Decisions
(Written by Opus 5.5) |
Keeps main's js-goaway-requests child and WT_DRAIN_SESSION decision, drops relay-drain-api and client-goaway (landed on the line), takes main's transport-upgrade quests, and keeps both the Advertisements type and the goaway field in js/net wire.ts. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Included review availability: This review used your included allowance. Your plan provides up to 4 included reviews per hour; 0 remain after this review. WalkthroughThe change adds GOAWAY decoding and publication in JavaScript connections, redirect-policy enforcement and bounded handover in JavaScript and Rust clients, and relay shutdown tracking with a fixed deadline and draining-session metrics. It adds signal-control options and tests for migration, shutdown timing, and a two-relay JavaScript viewer drain. Documentation and quest records are updated, and the drain harness is added to the workspace and nightly test matrix. Priority: ➖ Normal Merge Risk: 🔵 Low · up to The drain and migration changes look ready to merge. One edge case remains: an absurdly large configured drain timeout could panic the relay at shutdown. That value is unrealistic, so the risk is low. Security Architecture ReviewSecurity architecture risk: 🟡 Moderate · up to Conservative redirect defaults, terminal refusal handling, and bounded session retirement reduce risk. However, early shutdown completion can race pending handshakes, and cleanup of those handshakes remains unproven. Optional cross-host migration also requires deployment-specific trust and network controls. Retained concerns
Security review detailsSecurity Blast Radius
Security Findings and Attack Paths
Trust Boundaries and Controls
Resilience and Maintainability Implications
Hardening Proposals
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1✨ Simplify code
🛠️ Fix failing CI checks 💡
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Review comments at @rs/moq-relay/src/shutdown.rs:
- Line 31: Update the deadline calculation in the shutdown flow to use
Instant::checked_add instead of direct addition, treating overflow as no
deadline or applying a safe clamp. Check the other drain-timeout calculation in
the same shutdown code for the same direct-addition issue and use checked
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.github/workflows/nightly.ymldoc/bin/relay/config.mddoc/bin/relay/http.mddoc/bin/relay/index.mddoc/lib/js/net.mdjs/net/src/connection/forward.test.tsjs/net/src/connection/goaway.test.tsjs/net/src/connection/goaway.tsjs/net/src/connection/migrate.test.tsjs/net/src/connection/pool.tsjs/net/src/connection/reload.tsjs/net/src/error.tsjs/net/src/errors.tsjs/net/src/ietf/adapter.test.tsjs/net/src/ietf/adapter.tsjs/net/src/ietf/connection.tsjs/net/src/ietf/goaway.test.tsjs/net/src/ietf/goaway.tsjs/net/src/lite/connection.test.tsjs/net/src/lite/connection.tsjs/net/src/origin.test.tsjs/net/src/wire.tspackage.jsonquest/m1/README.mdquest/m1/drain-handshakes.mdquest/m1/drain/README.mdquest/m1/drain/client-goaway.mdquest/m1/drain/js-group-handover.mdquest/m1/drain/relay-drain-api.mdquest/m1/uring-runner.mdrs/moq-relay/src/config.rsrs/moq-relay/src/connection.rsrs/moq-relay/src/internal.rsrs/moq-relay/src/relay.rsrs/moq-relay/src/shutdown.rsrs/moq-relay/src/websocket.rsrs/moq-relay/tests/runtime_uring.rsrs/moq-relay/tests/shutdown_signal.rsrs/moq-tokio/src/client.rsrs/moq-tokio/src/connection.rsrs/moq-tokio/src/error.rsrs/moq-tokio/src/resolve.rsrs/moq-tokio/tests/reconnect.rstest/README.mdtest/drain/README.mdtest/drain/drain.tstest/drain/package.jsontest/drain/relay.tomltest/drain/run.shtest/justfile
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- quest/m1/drain/client-goaway.md
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Direction: the shared drain deadline, session guards, and bounded overlapping connections fit the problem; the TCP proxy is a practical alternative to privileged DNS setup. The two required JS children remain correctness gaps at this head, as acknowledged by the quests and confirmed in the code below. Finish those before treating the migration as lossless. Prefer Rust's stable, group-boundary subscription handover and a drain check at request creation over additional application resubscribe/budget logic.
Verification: reviewed the 51-file diff and relevant routing/subscriber context. Head workflows Check, Interop, WASM, Platform, and Release JS report success. No local tests ran: Bun, Cargo, and Nix are unavailable here. I did not verify zero-budget real-relay migration or execution on a supported io_uring kernel. The separately accepted handshake-counting follow-up is not a new finding.
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| // The replacement serves now; a predecessor keeps draining its groups in flight. | ||
| this.established.set(connection); |
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[P2] Carry track subscriptions across the replacement route
Keeping the predecessor's transport alive does not keep its broadcast subscriptions alive: the replacement is forwarded into the same origin, whose route swap closes the cached front (origin.ts:602) and previous request handle (origin.ts:1279). Existing track readers are not spliced onto the replacement, so subscribe-once consumers stop, and a live-edge resubscribe can miss the in-flight group. The new harness compensates with a 1s MAX_AGE and application resubscription. Complete the already-required group-boundary handover and test one continuous subscription at zero budget; otherwise this GOAWAY path still interrupts media before the handover cap.
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Agreed, and out of scope here by decision: the 2026-09-30 quest audit (#4589) promoted this to the standalone m1 quest /quest/m1/js-group-handover.md, whose done condition is test/drain passing at zero budget with one subscription. This PR lands the line without it.
(Written by Opus 5.5)
| const msg = await Goaway.decode(stream.reader, this.#version); | ||
| console.info("received goaway:", msg.uri); | ||
| // A peer sends at most one; a second is a protocol violation. | ||
| if (this.#goaway.peek() !== undefined) throw new ProtocolViolation("duplicate GOAWAY"); | ||
| this.#goaway.set({ uri: msg.uri }); |
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[P2] Prevent new requests on the session after GOAWAY
This only publishes the drain signal. The old route remains usable during handover, while the lite subscriber still opens streams without checking GOAWAY (subscriber.ts:212,658,691,1138); the IETF subscriber has the same gap. A new track/fetch/announcement-interest request in that window can therefore go to the draining relay, which refuses new work, instead of waiting for the replacement. Thread the drain state into both subscribers' open paths and make that refusal reroute or wait without ending the caller. Cover a new request during a delayed replacement while an existing subscription continues. This is the still-required js-goaway-requests child.
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Agreed, same as above: promoted to the standalone m1 quest /quest/m1/js-goaway-requests.md in the 2026-09-30 quest audit (#4589), with lite and IETF coverage for a new request during a delayed replacement.
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js-group-handover and js-goaway-requests become standalone m1 quests, and every reference to the drain line moves to them or drops. The relay embed docs note that a drain only reaches MoQ sessions. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Findings
const active = request.active.peek();
if (active && active !== current?.broadcast) { /* subscribe */ }
await request.active.changed();If
AssessmentSolid end-to-end drain line: one shared deadline, mid-drain admissions get the remaining window, Recommendation: MERGE This is an automated review, not the maintainer's decision |
Once a drain ends as soon as every session leaves, run no longer sleeps out the window, so dropping the listener left its QUIC socket open while the endpoint's closing connections finished in the background. Main's embed test caught it: the owner's sockets outlived run. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Reviewed commit: cba7744
No new actionable code findings in the incremental changes.
Direction: explicitly closing the shared listener at relay.rs:656–658 addresses the socket-lifetime problem at its owner with minimal added complexity. The existing shared-runtime embed test checks the relevant postcondition.
The scope decision is now explicit: the two previous JS findings remain unfixed and are promoted to standalone m1 quests, with the transport upgrade still depending on both. That is a coherent scoped drain improvement; zero-budget, subscribe-once JS handover and refusal of new work on draining sessions remain follow-ups, not verified guarantees.
Verification: reviewed the two branch-specific commits since a6a67f5 and relevant merge interactions, excluding unrelated changes inherited from main. No local tests ran; Bun, Cargo, and Nix are unavailable here. This head has no compile/test workflow results, only a skipped Auto-merge check, and GitHub currently reports merge conflicts. Resolve those and run the head's checks, including the shared-listener embed regression and drain integration test, before landing. Earlier green CI does not verify this head.
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Inline comments:
Review comments at @quest/m1/uring-runner.md:
- Around line 5-8: Update the runner explanation in the io_uring relay test
documentation to remove the inaccurate claim that GitHub-hosted runners are
below kernel 6.12; state the actual reason a self-hosted runner is required, or
remove that requirement if there is no other reason.
Review comments at @test/drain/drain.ts:
- Around line 151-153: Update the catch in the drain reader so
payload-validation and assertion failures propagate to the driver instead of
being logged and suppressed; suppress only expected subscription-close errors,
preserving the existing handling for those closures.
Review comments at @test/drain/run.sh:
- Around line 57-58: Update the TARGET_BASE handling in the run.sh setup to
resolve relative CARGO_TARGET_DIR values against WORKSPACE, while leaving
absolute paths unchanged, before deriving RELAY.
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.github/workflows/nightly.ymldoc/bin/relay/config.mddoc/bin/relay/http.mddoc/bin/relay/index.mddoc/lib/js/net.mdjs/net/src/connection/forward.test.tsjs/net/src/connection/goaway.test.tsjs/net/src/connection/goaway.tsjs/net/src/connection/migrate.test.tsjs/net/src/connection/pool.tsjs/net/src/connection/reload.tsjs/net/src/error.tsjs/net/src/errors.tsjs/net/src/ietf/adapter.test.tsjs/net/src/ietf/adapter.tsjs/net/src/ietf/connection.tsjs/net/src/ietf/goaway.test.tsjs/net/src/ietf/goaway.tsjs/net/src/lite/connection.test.tsjs/net/src/lite/connection.tsjs/net/src/origin.test.tsjs/net/src/wire.tspackage.jsonquest/m1/README.mdquest/m1/drain-handshakes.mdquest/m1/drain/README.mdquest/m1/drain/client-goaway.mdquest/m1/drain/relay-drain-api.mdquest/m1/js-goaway-requests.mdquest/m1/js-group-handover.mdquest/m1/redirect-resolve.mdquest/m1/transport-upgrade/README.mdquest/m1/transport-upgrade/js.mdquest/m1/uring-runner.mdquest/m2/firefox-155-webtransport.mdquest/m2/quic-careful-resume.mdrs/moq-relay/src/config.rsrs/moq-relay/src/connection.rsrs/moq-relay/src/internal.rsrs/moq-relay/src/relay.rsrs/moq-relay/src/shutdown.rsrs/moq-relay/src/websocket.rsrs/moq-relay/tests/runtime_uring.rsrs/moq-relay/tests/shutdown_signal.rsrs/moq-tokio/src/client.rsrs/moq-tokio/src/connection.rsrs/moq-tokio/src/error.rsrs/moq-tokio/src/resolve.rsrs/moq-tokio/tests/reconnect.rstest/README.mdtest/drain/README.mdtest/drain/drain.tstest/drain/package.jsontest/drain/relay.tomltest/drain/run.shtest/justfile
💤 Files with no reviewable changes (4)
- quest/m1/drain/client-goaway.md
- quest/m1/drain/README.md
- quest/m1/drain/relay-drain-api.md
- quest/m1/js-goaway-requests.md
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- rs/moq-relay/src/config.rs
- doc/bin/relay/http.md
- test/README.md
- quest/m1/README.md
- test/drain/README.md
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Follow-up (push after MERGE on a6a67f5)Two commits after the last review: quest promotion ( Earlier findings
This pushListener close ( Quest finish ( Ops note (not a code defect in the push)Head is CONFLICTING with Recommendation: MERGE This is an automated review, not the maintainer's decision |
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| // A client can see its session established before the relay counts it, and a | ||
| // drain with nothing counted ends at once. | ||
| let deadline = std::time::Instant::now() + TIMEOUT; | ||
| while sessions.list(&Default::default()).len() < 2 { |
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Waiting for two registry entries does not ensure that either session has installed the drain tally guard. In the io_uring path, sessions.register(...) runs at uring.rs:724, before request.ok().await at line 774 and before supervise calls shutdown.serve(). The loop can therefore finish while the tally is still zero, allowing shutdown.drained() to return immediately after trigger.start() and making this regression test retain the race it claims to fix. Wait for a state that is updated after the serving guard is installed.
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Declining here. The straggler connects only after established has completed its handshake and the relay has listed both, so established has long passed request.ok() into serve() when the trigger fires; only the straggler's own admission-to-count gap remains, and a drain with established counted does not end early. That gap is what Drain handshakes closes by counting sessions from admission, at which point the registry and the tally agree and this wait is exact.
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| if (pred()) return; | ||
| if (Date.now() > deadline) throw new Error("timed out waiting for condition"); | ||
| await settle(); |
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These mock-transport unit tests gate progress on Date.now() and repeated real setTimeout calls, and later make assertions around a 200 ms handover. A loaded or suspended CI worker can therefore fail correct behavior or make the suite unnecessarily slow. Use Bun's fake timers and observable state transitions so the tests advance the handover deterministically, as required for time-dependent unit tests.
AGENTS.md reference: AGENTS.md:L18-L19
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Declining in this PR. waitUntil polls observable state with a wall-clock guard only to fail instead of hang, the same helper pool.test.ts and reload.test.ts already use on main; the timing assertions are lower bounds that load cannot break. Moving the js/net connection tests to mocked time is worth doing across all three files together, so it is suggested as a follow-up rather than done for one file here.
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# Conflicts: # quest/m1/drain/README.md
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| for _ in 0..20 { | ||
| let probe = std::net::TcpListener::bind("127.0.0.1:0").unwrap(); | ||
| let addr = probe.local_addr().unwrap(); | ||
| drop(probe); |
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When tests or processes run concurrently, another process can claim addr after the probe is dropped and before listen() binds it; repeating that racy sequence 20 times only makes the failure probabilistic. Configure the actual listener with 127.0.0.1:0 and read its assigned address through tcp_local_addr(), as other tests in this crate already do, so the kernel reserves the port atomically.
AGENTS.md reference: AGENTS.md:L16-L16
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Fixed in b063f0c: the listener binds 127.0.0.1:0 and the test reads tcp_local_addr().
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- The drain harness fails on a corrupt group payload instead of logging it. - moq-tokio's reconnect test binds port 0 instead of probing for a port. - Drop quest/m1/uring-runner.md: the nightly rs uring job on the ARM runner (kernel 6.17) already runs the io_uring tests. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Reviewed commit: b063f0c
No new actionable findings in this five-file increment after the previously assessed main merge.
Direction: sound, focused test hardening. The port-zero bind removes the probe/rebind race at its source. The sticky corruption record and final failure check prevent a detected payload mismatch from becoming a successful run. Removing the separate runner quest aligns with the existing nightly rs uring job. No additional production API or wire changes in this increment.
The two previous JS findings remain explicitly deferred and unfixed: subscribe-once/group-boundary continuity and refusing new work after GOAWAY are still follow-ups.
Verification: static review of the incremental diff, listener implementation, harness control flow, and nightly wiring. No local tests ran; Bun, Cargo, and Nix are unavailable here. GitHub now reports this head mergeable, but Check, Interop, Platform, WASM, and Release JS are still queued or running. Real-relay drain and supported-kernel io_uring execution were not verified. Let the exact-head checks finish before landing.
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…t change Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Follow-up (push after MERGE on cba7744)PR-unique since last review: Earlier findings
This pushCorrupt group fails the e2e ( Port-0 bind in moq-tokio reconnect helper ( Drop GOAWAY Ops noteHead is CONFLICTING with Recommendation: MERGE This is an automated review, not the maintainer's decision |
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Reviewed commit: 714bb03
No new actionable findings in this increment.
Direction: the two GOAWAY helpers now use the same version as their mock sessions and message encoders: migrate.test.ts:68–70 and lite/connection.test.ts:55–57. This is the minimal adaptation to main's explicit stream-version requirement. The broader varint changes came from main; no additional branch-specific production API or wire change was introduced here.
The two previous JS findings remain deferred and unfixed: subscribe-once/group-boundary continuity and refusing new requests after GOAWAY.
Verification: static review of the changes since b063f0c and relevant merge interactions. No local tests ran; Bun, Cargo, and Nix are unavailable here. GitHub currently reports merge conflicts and no compile/test workflow results for this SHA, only a skipped Auto-merge check. Reconcile that state and run exact-head checks before landing; real-relay drain and io_uring execution remain unverified.
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Line branch for the drain questline (
/quest/m1/drain/README.md), now complete. Its children #4138, #4143, and #4186 landed here, along with the line's end-to-end test. The two JS follow-ups that held the line open are promoted to standalone m1 quests, so this PR deletes the line.Problem
A relay restart hard-dropped every session. The line makes a drain graceful end to end: the relay GOAWAYs every session against one deadline and exits as soon as they have all left, and both clients migrate on the GOAWAY through a fresh resolve. Nothing proved the pieces work together against real relays.
Approach
Relay::with_signals(false)hands SIGTERM to an embedder, whoseshutdown_triggerdrains every session, including ones that arrive mid-drain, against one deadline.Relay::runreturns once every session has left.moq_relay_draining_sessionsreports progress.Connectionmigrates on GOAWAY likemoq_tokio::Connection. The old session keeps serving until the handover cap while the replacement dials. Rust refuses bad redirects.just test drain(test/drain/) starts relay B with a JS publisher, and relay A clustered to B. A@moq/netviewer watches the track through a TCP proxy that stands in for DNS. The driver points the proxy at B, then SIGTERMs A. It requires that the viewer reads fresh groups on B within 6s (well inside A's 20s window), that no group is missing across the swap, that A is dialed only once, and that A exits loggingevery session left. The test runs in the nightlytestsmatrix.uring-runner, added earlier on the line, is deleted too: its premise was wrong, since the nightlyrs uringjob on ubuntu-24.04-arm (kernel 6.17) already runs the io_uring tests. JS group-boundary handover and JS GOAWAY requests move to m1 at the line's rank, and the transport upgrade's JS half requires both. Every other reference to the line is dropped. One new m1 quest, Drain handshakes, covers the follow-up below.origin/mainmerged in (twice, most recently on 2026-09-30). Main already landed make-before-break injs/net/src/origin.ts, so main's version is kept, along with this line's regression test. The relay tests now read ports back fromRelay::loadinstead of probing.Relay::runnow closes its shared listener before returning. Main'sembed::shared_tokio_custom_route_and_quic(test: prove stopped relays and worker groups closed their sockets instead of racing a rebind #4408) failed after the latest merge: withrunreturning as soon as a drain empties instead of sleeping out the window, the dropped listener's QUIC socket outlivedrunwhile closing connections finished in the background.uring_workers_drain_on_the_triggerfailed on the line (PR CI never compiles the io_uring feature, and the nightlyrs uringjob only runs on main). feat(relay): end a drain once every session has left #4186 ends a drain once no counted session is left, and a lite-06 client over the io_uring workers sees its session before the relay counts it. The test now holds a moq-lite-03 straggler and triggers only after the relay lists both sessions, asshutdown_signal.rsdoes.Impact
moq_relay::Relay::with_signals(bool),internal::Internal::with_shutdown(shutdown::Observer): new, additive.Relay::runreturns as soon as a drain empties, instead of sleeping out the window, with the shared QUIC socket already released.moq_relay_draining_sessions.moq-tokio: newError::RefusedRedirect. A refused or malformed redirect is now terminal.@moq/net: newConnectionProps.goaway,Connection.Goaway,Connection.Redirect,Error.RefusedRedirect. Connections migrate on GOAWAY.test/drainbun workspace member (@moq/drain-test, private) and ajust test drainrecipe.Alternatives
bun, or an example binary. SIGTERM on the relay binary fires the sameTrigger::start, and a shell harness matchestest/wasmandtest/interop./etc/hosts,SO_REUSEPORT): this needs root or makes landing nondeterministic. The proxy makes "withdraw from DNS" an explicit step.Decisions
Settled by the maintainer in the 2026-09-30 quest audit (#4589):
Settled in this session, on review:
uring-runner(CodeRabbit: the nightly ARM runner's kernel is above the 6.12 floor)?MOQ_STRICTFollow-ups
(Written by Opus 5.5)
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