feat(uring): write qlog traces from the io_uring workers - #3420
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Claim UUID: f5d06ad1-dce2-45a0-a86e-406d7c07b123 Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DLtoPv9B3779kGxLFTUGHR
`quic.qlog` was refused outright on the io_uring listener, so a congestion-control or stall investigation had to move to the tokio runtime, and therefore a different data path, to get a trace of the path it was investigating. It is now honored on all three backends behind the existing `qlog` feature. Where the bytes land: not through the ring. Every stack takes its trace writer as `Box<dyn io::Write + Send + Sync>`, which cannot hold the worker's `!Send` ring handle, so a ring-backed writer needs a cross-thread hop regardless. `quic::qlog::Sink` therefore stages a trace in memory (8 KiB chunks, matching the `BufWriter` the tokio path batches with) and hands whole chunks to one background thread shared by every worker in the group, so a pinned worker never issues a file syscall. A queue past 64 MiB drops chunks rather than growing without bound; JSON-SEQ records are newline delimited, so a reader resynchronizes after the gap. Layout follows each backend, as it does on the tokio stack: noq and quiche write one file per connection, quinn-proto takes one sink per transport config and so writes one per endpoint. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DLtoPv9B3779kGxLFTUGHR
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DLtoPv9B3779kGxLFTUGHR
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DLtoPv9B3779kGxLFTUGHR
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Resolve the quest deletions and preserve both qlog and metrics documentation. Bound qlog control-message memory, reserve close capacity, and make sink filenames unique. Co-Authored-By: Codex <noreply@openai.com>
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The gap and Opus decoder fixtures publish all packets before they begin reading. Request a one-second age budget so the live-edge subscription keeps the history those assertions exercise after the latest dev merge. Co-Authored-By: Codex <noreply@openai.com>
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The resampling fixture emits a one-second burst before reading it. Give that subscription a two-second age budget so the first packet remains observable under the current dev live-edge semantics. Co-Authored-By: Codex <noreply@openai.com>
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Included review availability: Your plan provides up to 4 included reviews per hour; 0 remain after this review. WalkthroughAdds feature-gated qlog capture for io_uring workers. Implements bounded asynchronous JSON-SEQ trace writing and integrates it with quiche, noq, and quinn-proto. Updates relay configuration, build checks, documentation, and tests. Also adjusts audio test timing and revises related documentation and quest entries. Merge Risk: ⚪ Minimal · up to This change aligns OBS test stubs with the current libmoq ABI while adding feature-gated io_uring qlog support. No concrete current-head merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches✨ Simplify code
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Actionable comments posted: 2
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Inline comments:
In `@doc/bin/relay/config.md`:
- Around line 128-130: Update the filename documentation near the existing
io-uring-quinn note to state that Sink::endpoint_trace produces
moq-<started>-<process>-<sink>-endpoint<N>-<side>.qlog,
using endpoint<N> instead of a connection ID, so operators can locate
these traces.
In `@rs/moq-uring/src/quic/qlog.rs`:
- Around line 292-295: Update Trace::write to split oversized input into
CHUNK-bounded segments before appending and staging, ensuring self.buf never
exceeds the documented staging bound and each segment follows the existing
stage/send_chunk flow.
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⛔ Files ignored due to path filters (1)
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📒 Files selected for processing (17)
doc/bin/relay/config.mdquest/m1/README.mdquest/m1/uring-qlog.mdrs/justfilers/moq-audio/src/decode/consumer.rsrs/moq-net/src/model/broadcast.rsrs/moq-relay/Cargo.tomlrs/moq-relay/src/uring.rsrs/moq-relay/tests/runtime_uring.rsrs/moq-uring/Cargo.tomlrs/moq-uring/README.mdrs/moq-uring/src/quic/mod.rsrs/moq-uring/src/quic/qlog.rsrs/moq-uring/src/quic/quiche/endpoint.rsrs/moq-uring/src/quic/quiche/mod.rsrs/moq-uring/src/quic/quinn/mod.rsrs/moq-uring/tests/qlog.rs
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- quest/m1/uring-qlog.md
- quest/m1/README.md
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Split oversized io::Write inputs into CHUNK-sized messages before queueing so a single serialization call cannot exceed the staging bound. Document Quinn's endpoint filename form and cover the segment sizes with a regression test. Co-Authored-By: Codex <noreply@openai.com>
A peer can reuse the same Initial destination connection ID for sequential connections. Include the sink-local trace slot in each per-connection filename so the later trace cannot truncate the earlier one, and cover the collision with a regression test.
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The dev merge updated moq_session_connect with a client config and made coded video dimensions scalar, but the OBS source test still declared the old ABI. Match the generated header so the test exercises the current interface.
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Each admitted per-connection trace retained an 8 KiB staging allocation outside the shared limit. Charge staging, queued buffers, and control messages to one 64 MiB budget, reserve replacements before allocation, and group the Quiche attachment context so its call sites cannot drift.
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🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
printf '%s\n' '=== HEAD ==='
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git status --short
printf '%s\n' '=== Recent commits ==='
git log --oneline -12
printf '%s\n' '=== Changed files against merge base ==='
base="$(git merge-base HEAD origin/main 2>/dev/null || git merge-base HEAD main 2>/dev/null || true)"
if [ -n "$base" ]; then
git diff --name-status "$base"..HEAD
else
git show --name-status --format= HEAD
fi
printf '%s\n' '=== qlog module outline ==='
ast-grep outline rs/moq-uring/src/quic/qlog.rs --items all 2>/dev/null || true
printf '%s\n' '=== QUIC module outline ==='
ast-grep outline rs/moq-uring/src/quic --items all 2>/dev/null || true
printf '%s\n' '=== qlog references ==='
rg -n -C 3 --glob '*.rs' '\b(qlog|endpoint_trace|\.trace\(|with_qlog|QUEUED_MAX|CHUNK)\b' rs/moq-uring rs/moq-relayLength of output: 77287 🏁 Script executed: #!/bin/bash
set -euo pipefail
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git diff --stat 1edbde322..30c0de5f1
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git diff --find-renames 1edbde322..30c0de5f1 -- rs/moq-uring/src/quic/qlog.rs rs/moq-uring/src/quic/quiche/mod.rs rs/moq-uring/src/quic/quiche/endpoint.rs
printf '%s\n' '=== qlog implementation ==='
sed -n '1,375p' rs/moq-uring/src/quic/qlog.rs
printf '%s\n' '=== qlog unit tests ==='
sed -n '376,540p' rs/moq-uring/src/quic/qlog.rs
printf '%s\n' '=== Quiche qlog setup and connection lifecycle ==='
sed -n '1,110p' rs/moq-uring/src/quic/quiche/mod.rs
sed -n '180,255p' rs/moq-uring/src/quic/quiche/endpoint.rs
sed -n '360,440p' rs/moq-uring/src/quic/quiche/endpoint.rs
printf '%s\n' '=== Quinn/noq qlog integration ==='
sed -n '145,280p' rs/moq-uring/src/quic/quinn/mod.rs
printf '%s\n' '=== Feature declarations and integration test ==='
sed -n '1,150p' rs/moq-uring/Cargo.toml
sed -n '1,190p' rs/moq-uring/tests/qlog.rsLength of output: 50747
I found no new correctness issues. The qlog sink now accounts for live staging buffers, queued buffers, and reserved control messages. The accounting transfers correctly when The Quiche The focused diff has no whitespace errors. I did not independently run the reported local test suites in this sandbox.
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Describe the io_uring capture and shutdown flush that the integration test verifies instead of preserving the old refusal history in source documentation.
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🧩 Analysis chain🏁 Script executed: #!/bin/bash
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echo '=== qlog module outline ==='
ast-grep outline rs/moq-uring/src/quic/qlog.rs --items all 2>/dev/null || true
echo '=== qlog and integration-test references ==='
rg -n -C 4 --glob '*.rs' '\b(Trace|Sink|stage|write|close|queued|qlog|Qlog|integration)\b' \
rs/moq-uring/src/quic/qlog.rs rs/moq-uring/tests/qlog.rs rs/moq-relay/tests/runtime_uring.rs 2>/dev/null || trueLength of output: 40036 🏁 Script executed: #!/bin/bash
set -euo pipefail
echo '=== complete qlog relay integration test ==='
sed -n '353,455p' rs/moq-relay/tests/runtime_uring.rs
echo '=== Relay lifecycle declarations and implementations ==='
rg -n -C 5 --glob '*.rs' \
'(struct Relay\b|impl Relay\b|async fn run\s*\(|fn run\s*\(|pub async fn run\s*\()' \
rs/moq-relay/src
echo '=== io_uring worker lifecycle and qlog sink ownership ==='
rg -n -C 5 --glob '*.rs' \
'(struct Worker|struct Workers|impl Drop for .*Worker|qlog\s*=|Sink::directory|transport\s*\()' \
rs/moq-relay/src rs/moq-uring/srcLength of output: 23637 🏁 Script executed: #!/bin/bash
set -euo pipefail
echo '=== Relay::run ownership scope ==='
sed -n '259,350p' rs/moq-relay/src/relay.rs
echo '=== Workers serving and thread ownership ==='
sed -n '87,180p' rs/moq-relay/src/uring.rs
sed -n '330,400p' rs/moq-relay/src/uring.rs
echo '=== qlog close and writer flush behavior ==='
sed -n '246,375p' rs/moq-uring/src/quic/qlog.rs
echo '=== documentation-only diff ==='
git diff --check 30c0de5f1..c7f4d29dd
git diff --word-diff=plain 30c0de5f1..c7f4d29dd -- rs/moq-relay/tests/runtime_uring.rsLength of output: 14814
I found no new correctness issues. The only new commit changes the integration-test documentation. The documentation matches the implementation. The focused diff has no whitespace errors. I did not run the reported local test suites in this sandbox.
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Codex Review: Didn't find any major issues. Already looking forward to the next diff. 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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# Conflicts: # rs/moq-audio/src/decode/consumer.rs # rs/moq-audio/src/encode/producer.rs
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🧩 Analysis chain🏁 Script executed: #!/bin/bash
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parents="$(git show -s --format=%P HEAD)"
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git diff --find-renames --find-copies "$1..HEAD"
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git diff --find-renames --find-copies "$2..HEAD"
fi
echo '=== PR merge-base and audio changes in full PR diff ==='
base="$(git merge-base HEAD origin/dev 2>/dev/null || git merge-base HEAD dev 2>/dev/null || true)"
printf 'base=%s\n' "$base"
if [ -n "$base" ]; then
git diff --name-status "$base..HEAD" -- 'rs/moq-audio/**'
git diff --check "$base..HEAD" -- 'rs/moq-audio/**'
git diff --find-renames --find-copies "$base..HEAD" -- 'rs/moq-audio/**'
fiLength of output: 58406 🏁 Script executed: #!/bin/bash
set -euo pipefail
echo '=== Pull request base metadata ==='
gh pr view 3420 --repo moq-dev/moq --json baseRefName,baseRefOid,headRefOid,url
base="$(gh pr view 3420 --repo moq-dev/moq --json baseRefOid --jq .baseRefOid)"
head="$(git rev-parse HEAD)"
printf 'base=%s\nhead=%s\n' "$base" "$head"
echo '=== Audio paths changed from PR base to final head ==='
git diff --name-status "${base}..${head}" -- 'rs/moq-audio/**'
git diff --check "${base}..${head}" -- 'rs/moq-audio/**'
git diff --find-renames --find-copies "${base}..${head}" -- 'rs/moq-audio/**'
echo '=== Final audio blobs versus merge second parent ==='
second_parent="$(git show -s --format=%P HEAD | awk '{print $2}')"
for path in rs/moq-audio/src/decode/consumer.rs rs/moq-audio/src/encode/producer.rs; do
printf '%s\n' "--- $path ---"
printf 'HEAD: '
git rev-parse "HEAD:$path"
printf 'second-parent: '
git rev-parse "${second_parent}:$path"
doneLength of output: 1786
Pull request The final PR diff contains no changes under I found no new correctness issues. The focused diff has no whitespace errors. I did not run the reported local test suites in this sandbox.
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| let path = inner.dir.join(format!( | ||
| "moq-{}-{}-{}-{id}-{}.qlog", | ||
| inner.started, | ||
| inner.process, | ||
| inner.sink, |
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When multiple containerized relay instances write to a shared qlog directory, they commonly all see the same namespace-local PID (often 1); if two sinks are initialized in the same millisecond, their sink and trace counters also both start at zero, so the quinn backend selects the same endpoint0-server.qlog path. This final head still passes that path toFile::create`, allowing one instance to truncate or overwrite the other's trace. This is fresh evidence beyond the resolved same-process sink collision: use collision-safe creation or add randomness that is unique across PID namespaces.
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Agreed. This review completed after GitHub auto-merged the PR, so the finding cannot be corrected in #3420. A follow-up should use collision-safe file creation so separate PID namespaces sharing one directory cannot truncate each other's traces. I am leaving this thread unresolved to track that required fix.
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Summary
quic::qlog::Sink, which stages trace data on pinned workers and writes it through one shared background thread.dev.libmoqsession and video-config ABI after thedevmerge.Design
The QUIC backends require a
Send + Syncio::Write, while the worker's io_uring handle is!Send.Sinktherefore keeps file syscalls off pinned workers without adding a Tokio dependency: traces are chunked in memory and handed to one writer thread shared by the worker group. When the writer falls behind, new chunks are dropped with one warning instead of allowing unbounded growth.No wire behavior changes. qlog is observation only.
Public API
moq_uring::quic::qlog::Sinktype andSink::directoryconstructor.moq_uring::quic::Transport::qlogfield.moq_uring::quic::Error::Qlogvariant.moq-uring/qlogfeature and connect it to the relay's existingqlogfeature.moq-uringis version0.0.1, and these additions do not break its existing API.Validation
just checkjust test(all JavaScript tests and 4,239 Rust tests passed)cargo clippy --locked -p moq-uring --all-targets --features qlog -- -D warningscargo test --locked -p moq-uring --features qlogcargo test --locked -p moq-uring --no-default-features --features quinn,qlogcargo test --locked -p moq-uring --no-default-features --features quiche,qlogjust _markdown checkjust obs ciRegression coverage includes staging-memory saturation, bounded staging writes, complete memory-accounting lifecycle, reused connection IDs, concurrent sinks, missing directories, real backend handshakes, and relay integration.
Cross-package sync
The relay configuration documentation and
moq-uringREADME describe the feature, per-backend file layout, unique filename format, background writer, and bounded queue behavior. The OBS source-test stubs are synchronized with the existinglibmoqABI. No draft or cross-language update applies because this PR does not change the wire format or FFI.(Written by GPT-5)