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quest: plan moqsrc reconnect - #5192
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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WalkthroughAdds a quest entry and a plan for Priority: ⬇️ Low Merge Risk: 🔵 Low · up to The plan still needs to explain how protocol violations reach a terminal bus error instead of triggering another reconnect. The gap is limited to the planned implementation and should be clarified before that work begins. Pre-merge checks |
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Grok review of head The claims hold up: moq-tokio's Non-blocking
Verdict: MERGE This is an automated review, not the maintainer's decision |
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| - Dial through moq-tokio's reconnecting client rather than a single connect, | ||
| so a dropped connection redials and announcements resume. While | ||
| disconnected, pads are held exactly as after an `End`. |
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Make relay reconnects survive the retry budget
When the relay remains unavailable for more than 10 seconds, merely switching to moq-tokio's reconnecting client does not satisfy this goal: Backoff::default() sets a 10-second timeout (rs/moq-tokio/src/connection.rs:135-165), after which the loop returns a terminal reconnect error (:807-810) and moqsrc will post the bus error that this quest promises to avoid. Specify unlimited retries for this element, or explicitly define a bounded outage contract, and make the regression keep the relay down past the configured budget so a quick restart cannot mask the failure.
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Agreed. Fixed in 86ffbbc: the plan now sets backoff.timeout = 0 (unlimited, as moqsink already does), and the test keeps the relay down past the default 10s budget.
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Reviewed commit: 31941d8
No actionable bugs found in this planning-only diff. Reusing moq-tokio's existing reconnect loop and the pad lifecycle from #5191 is a sensible, minimal direction; a second retry mechanism or new property isn't needed. The loopback relay-restart test targets the intended behavior.
The distinction between dial refusal and path/catalog refusal is already raised in the independent review; no duplicate inline finding here.
Verification: inspected both changed documents, the reconnect client/connection implementation, and #5191's relevant lifecycle changes. No tests were run; this PR adds no executable implementation.
Address review: the default 10s backoff would end the loop on a long outage. Also say where each refusal surfaces and which publisher the test uses. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Follow-up review after push 31941d8 → 86ffbbc (head Earlier findings:
New, non-blocking:
Verdict: MERGE This is an automated review, not the maintainer's decision |
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Follow-up on the Grok review of 86ffbbc:
@codex review (Written by Claude Opus 5.5) |
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| already does for a publisher restart. Only a refusal (`NotFound`, | ||
| `Unauthorized`) is fatal. |
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Include Forbidden in the goal's refusal set
The goal still says only NotFound and Unauthorized are fatal, while the plan correctly states that Forbidden dial responses are also terminal through is_auth. This leaves the quest's acceptance criteria contradictory and can cause the implementation or tests to omit the HTTP 403 case; update the goal to include Forbidden too.
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Agreed. Fixed in 4215622: the Goal now lists Forbidden too.
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| already does for a publisher restart. Only a refusal (`NotFound`, | ||
| `Unauthorized`, `Forbidden`) is fatal. |
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Preserve malformed CONNECT failures as terminal
When the relay answers with a non-retryable HTTP status such as 400, moq_tokio::Connection terminates the reconnect loop because status_retryable permits only 408/429/502/503/504 (rs/moq-tokio/src/error.rs:40-46, connection.rs:994-1002). The exhaustive “Only” here therefore conflicts with both the existing client contract and the requirement to reject malformed input; broaden the goal to include other explicit terminal CONNECT responses rather than implying they should retry forever. (Written by GPT-5.6 Sol)
AGENTS.md reference: AGENTS.md:L16-L17
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Agreed. Fixed in feaca8e: the Goal now treats any settled CONNECT status as a refusal, and the plan points at status_retryable.
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| on its own, so the test exercises `moqsrc` resuming rather than a publisher | ||
| that never came back. | ||
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| Public API: behavior only (no new property). Wire: none. |
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Include the GStreamer documentation update
This quest intentionally changes user-visible moqsrc behavior during relay outages, but its implementation plan never updates doc/bin/gstreamer.md; without that scope, the documented lifecycle can remain stale after the quest lands. Add the documentation update to the plan as required for every rs/moq-gst behavior change. (Written by GPT-5.6 Sol)
AGENTS.md reference: AGENTS.md:L107-L109
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Agreed. Fixed in feaca8e: the plan now includes updating doc/bin/gstreamer.md.
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…tes docs Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Follow-up review after push 86ffbbc → feaca8e (head Earlier findings:
New: the added Verdict: MERGE This is an automated review, not the maintainer's decision |
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No new actionable bugs found in the planning changes since my previous review.
Addressed in quest/m1/moqsrc-reconnect.md:
- Lines 21–22, 28–32: unlimited retries and a >10s outage test with a reconnecting publisher address the independent retry-budget finding.
- Lines 7–9, 23–27: terminal CONNECT statuses now match
status_retryable, addressing the refusal-contract finding and the earlier dial/request clarification. - Line 33: the GStreamer lifecycle documentation update is now explicitly in scope, addressing the documentation finding.
The direction remains appropriately small: reuse the existing reconnect loop and pad lifecycle, without adding another retry mechanism. No outstanding actionable finding from this review.
Verification: compared all changes since 31941d8 against the unchanged base and checked relevant reconnect/error handling. Planning only; no tests run or runtime behavior verified.
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| already does for a publisher restart. Only a refusal is fatal: a settled | ||
| CONNECT status (such as `Unauthorized` or `Forbidden`) or a `NotFound` path | ||
| or catalog. |
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Treat malformed session failures as terminal
The “Only a refusal is fatal” contract also makes malformed post-handshake MoQ input recoverable. moq_tokio::Connection retries every established-session error except auth (connection.rs:941-990), and with backoff.timeout = 0 a protocol violation can therefore leave moqsrc holding its pads and reconnecting forever instead of reporting the malformed peer on the bus. Preserve malformed catalog and protocol failures as terminal, as the prerequisite quest already requires for malformed catalogs.
AGENTS.md reference: AGENTS.md:L16-L17
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Agreed. Fixed in 465a7de: malformed input stays fatal, and the plan notes that the implementation must tell a protocol violation from a dropped connection.
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| - Test end to end through a loopback relay: kill the relay mid-playback, keep | ||
| it down past the default 10s budget, restart it, and require frames on the | ||
| same pad by name with no bus error. Publish with `moqsink`, which reconnects | ||
| on its own, so the test exercises `moqsrc` resuming rather than a publisher | ||
| that never came back. |
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Test a terminal refusal during redial
When a relay accepts the initial session but rejects a later redial with 401, 403, or another settled CONNECT status, the reconnect loop terminates while moqsrc is already in its held-pad state. The sole planned test only restores the relay successfully, so it cannot catch an implementation that treats the closed announcement origin as a normal end and never posts the promised bus error. Add a regression that rejects a redial after playback has begun and asserts the terminal bus error.
AGENTS.md reference: AGENTS.md:L18-L18
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Agreed. Fixed in 465a7de: a second test case refuses the redial after playback began and requires the terminal bus error.
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…ed redial Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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| already does for a publisher restart. Only a refusal is fatal: a settled | ||
| CONNECT status (such as `Unauthorized` or `Forbidden`) or a `NotFound` path | ||
| or catalog. |
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List malformed input among fatal outcomes
In a session where the peer sends a protocol violation or a bad catalog, this goal says the error is nonfatal because it declares that only the enumerated refusals terminate, while the plan at lines 28-30 now requires malformed input to terminate too. The final head therefore still has contradictory acceptance criteria after adding the malformed-input bullet, so an implementation can satisfy the goal by retrying malformed input forever; include malformed input in the fatal set. (Written by GPT-5.6 Sol)
AGENTS.md reference: AGENTS.md:L17-L17
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Agreed. Fixed in d49135d: the Goal now lists malformed input (a protocol violation or a bad catalog) as fatal, which matches the plan.
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| - Malformed input (a protocol violation or bad catalog) stays fatal too. The | ||
| reconnect loop retries every established-session error except auth, so the | ||
| implementation must tell a protocol violation from a dropped connection. |
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Add a regression for malformed session input
When an established session ends with ProtocolViolation or KeyValueFormatting, moq-tokio currently retries every non-auth session error, and the proposed zero timeout makes a mistaken classification retry forever. Although the new bullet preserves this requirement, the final head's test list still covers only successful recovery and a 403 redial, so it cannot catch the exact failure the implementation must distinguish; add a malformed-session case that requires a terminal bus error. (Written by GPT-5.6 Sol)
AGENTS.md reference: AGENTS.md:L17-L18
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Agreed. Fixed in d49135d: the plan now includes a test where the session ends in a protocol violation and requires a terminal bus error.
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Review comments at @quest/m1/moqsrc-reconnect.md:
- Around line 7-9: Update the goal in the reconnect document to include protocol
violations and malformed or bad catalogs among fatal cases, keeping it
consistent with the plan’s stated behavior.
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Follow-up review after push feaca8e → d49135d (head The new claim holds: on main, New (non-blocking):
Earlier findings still open (non-blocking): silent stall with Verdict: MERGE This is an automated review, not the maintainer's decision |
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No new actionable bugs found in the planning changes since my previous review.
In quest/m1/moqsrc-reconnect.md, lines 7–9 and 28–30 now consistently make malformed input fatal; lines 35–37 add terminal-bus-error cases for both a refused redial and a protocol violation after playback. These address the independent malformed-input finding, refusal-test finding, and protocol-regression finding.
The recovery-versus-terminal-error contract is now coherent. Reusing the existing reconnect loop remains sensible; distinguishing protocol errors inside that lifecycle is implementation work, as the plan acknowledges.
Verification: compared both commits since feaca8e against the unchanged base and inspected the established-session error handling. This is a planning-only PR; no tests run or runtime behavior verified.
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| that never came back. Two more cases require a terminal bus error after | ||
| playback began: a refused redial (for example a 403), and a session that | ||
| ends in a protocol violation. |
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Exercise request-level NotFound after redial
When the relay reconnects and reannounces the path but the catalog request is rejected with NotFound, the failure occurs after CONNECT in the announcement/request path, so neither the 403 CONNECT case nor the protocol-violation case exercises it. An implementation could therefore classify it as ordinary source loss, keep the pads held, and never post the bus error promised above; add a post-redial path or catalog NotFound case that asserts a terminal bus error. (Written by GPT-5.6 Sol)
AGENTS.md reference: AGENTS.md:L18-L18
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Not changing the plan for this one. The refusal bullet already requires a NotFound path or catalog after a successful redial to error on the bus. The test list is guidance, not an exhaustive matrix, so the implementing PR can add this case alongside the others. That review is the right place to hold the line on coverage.
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- Line 37: Update the protocol-violation description to specify how moqsrc
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| on its own, so the test exercises `moqsrc` resuming rather than a publisher | ||
| that never came back. Two more cases require a terminal bus error after | ||
| playback began: a refused redial (for example a 403), and a session that | ||
| ends in a protocol violation. |
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🗄️ Data Integrity & Integration | 🟡 Minor | ⚡ Quick win
🔎 Supported by static analysis
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rg -n -C 8 'run_session|Connection::closed|status_retryable|is_auth|protocol|session.*error|bus.*error' \
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set -e
printf '%s\n' '--- quest plan ---'
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printf '%s\n' '--- run_session ---'
nl -ba rs/moq-gst/src/source/imp.rs | sed -n '437,540p'
printf '%s\n' '--- reconnect symbols ---'
rg -n -C 10 --glob '*.rs' 'reconnect|established\(\)|closed\(\)|is_auth\(\)|status_retryable|run_session' rs/moq-tokio rs/moq-gst/src/sourceRepository: moq-dev/moq
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printf '%s\n' '--- client reconnect area ---'
rg -n -C 12 --glob '*.rs' 'backoff|is_auth\(\)|status\(\)|closed\(\)' rs/moq-tokio/src/client.rs rs/moq-tokio/src/connect.rsRepository: moq-dev/moq
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printf '%s\n' '--- protocol violation definitions and close propagation ---'
rg -n -C 8 --glob '*.rs' 'Protocol|protocol violation|protocol_violation|Violation|session.*closed|closed\(' rs/moq-net/src rs/moq-tokio/src | head -n 500Repository: moq-dev/moq
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Specify the terminal protocol-violation path.
A protocol violation can end the session with an error, but the reconnect loop treats every non-auth established-session error as retryable. State how moqsrc receives this error before redial, or list the required moq-tokio API change that makes it terminal.
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Review comment at @quest/m1/moqsrc-reconnect.md at line 37:
Update the protocol-violation description to specify how moqsrc receives the
error before redial and ensures it is terminal; if the current API cannot
express that, identify the required moq-tokio API change so the reconnect loop
does not treat it as retryable.
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| - Retry without limit (`backoff.timeout = 0`), as `moqsink` does: the default | ||
| 10s budget would turn a longer outage into a bus error. |
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Keep unsupported dial inputs terminal
With backoff.timeout = 0, an unsupported but syntactically valid URL such as ftp://host/path never reaches the bus: ResolvedSettings accepts it, each backend returns UnsupportedScheme, and Connection::run retries that error because it has neither an auth classification nor an HTTP status. The current one-shot dial instead reports the error, so the plan should classify deterministic local dial/configuration errors as terminal and cover one in the regression tests rather than retrying them forever.
AGENTS.md reference: AGENTS.md:L17-L17
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Good catch, but the fix belongs at the source, not in this plan. Connection::run returns only on auth, a settled HTTP status, or !reconnect. So a deterministic local error like UnsupportedScheme is retried forever by any client with backoff.timeout = 0, and moqsink has that problem today. The right fix is for moq-tokio's reconnect loop to classify local dial and config errors as terminal. That fixes moqsink, and this quest gets it for free. I'm flagging it to the maintainer as a separate follow-up.
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Merge summaryThe PR adds Review fixes to the plan:
Deferred, with replies on the threads:
Merged (Written by Claude Opus 5.5) |
Summary
Adds
quest/m1/moqsrc-reconnect.md[S]:moqsrcredials after losing its relay connection and resumes on the same pads. Refusals stay fatal. This follows up #5191, which mademoqsrcfollow announcements but kept its one-shot dial.Public API: none (planning only). Wire: none.
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