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fix(rust-executor): exit when the REST API fails, TLS bad-cert fallback, startExecutor hardening - #1173
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ApiClient.call() awaits the connection-readiness promise before it
registers a pending call or arms its timeout. When the first socket
failed before opening (error + close, e.g. ECONNREFUSED because the
executor had not bound its port yet), onclose set _wsReady = null
without settling the promise the caller was awaiting. No reconnect was
scheduled either, because _pendingCalls was empty and there were no
subscribers. The call hung forever: CI jobs 32532 and 32154 each sat
in a before-all hook for the full 1200 s mocha timeout.
A connection now runs as a cycle whose readiness promise survives
failed attempts:
- a connect that closes before opening is retried with the existing
backoff, and the same waiters stay attached;
- after CONNECT_TIMEOUT_MS (30 s) without an open socket, the waiters
reject with RpcError 503 "WebSocket could not connect to <endpoint>
within 30000ms" (no token in the message), and a socket stuck in
CONNECTING is closed;
- closeAll() rejects callers still waiting for the connect
("Client closed") instead of stranding them;
- unsubscribe() counts callers waiting for the connect, so it no longer
closes the socket under them;
- onopen/onclose ignore sockets that were already detached, so a late
close from an old socket cannot null the new one or reject its calls.
Subscribers keep reconnecting after a failed cycle, as before.
Tests: seven new cases in apiClient.test.ts drive a scripted
WebSocket (refuse / open / hang) under fake timers. Five of them fail
on origin/dev with the call still pending, which is the CI hang.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The line was logged before TcpListener::bind. tests/js/utils startExecutor resolves on that line, so a test that created an Ad4mClient straight away could connect before the executor was listening and get ECONNREFUSED. That is the first half of the integration-test hang in CI jobs 32532 and 32154. The line text is unchanged; it now means the API accepts connections. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
📝 WalkthroughWalkthroughThe API client now retries failed WebSocket connections, limits caller wait time, and manages readiness waiters during closure and unsubscription. The non-TLS Rust server now binds its listener before logging that startup is beginning. ChangesAPI client connection recovery
Rust server startup logging
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~20 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant Caller
participant ApiClient
participant WebSocket
Caller->>ApiClient: Wait for readiness
ApiClient->>WebSocket: Open connection
WebSocket-->>ApiClient: Connection attempt fails
ApiClient->>WebSocket: Retry connection
WebSocket-->>ApiClient: Connection opens
ApiClient-->>Caller: Resolve readiness
Suggested reviewers: Merge Risk: 🟡 Moderate · up to Resolve the dev-workflow failure-reporting concern before merging. The TLS test and startup diagnostics retain narrower reliability concerns. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The changes bound failed connection attempts and make the non-TLS startup signal more reliable. Review found no new service destination or privilege path, but server-side authorization and deployment behavior were not fully examined. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 63.16% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 19 functions across 12 files. (1 skipped: 1 unsupported.)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
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Approving. Traced the hang from the symptom rather than taking the summary, and the diagnosis holds.
The old path, step by step. A caller enters _ready(), _ensureWs() builds promise P and socket S, the caller awaits P. S closes before opening — ECONNREFUSED, because the executor has not bound yet. onclose nulls _ws and _wsReady, and never settles P. Then the reconnect condition: the caller is not in _pendingCalls (it is still inside _ready()), and a bare before-all has no subscribers, so _wsCallbacks.size === 0 && !hadPendingCalls and nothing is scheduled. Nobody settles P and nobody retries. That is a permanent hang with no timer left in the process, which is exactly the 1200s shape in jobs 32532 and 32154.
Both halves are fixed, and both are needed. The cycle now always settles — _failConnect on budget, _closeWs on shutdown — and it retries on its own rather than depending on there being a subscriber or an already-registered pending call.
This is really two fixes, and the second is the root cause. tests/js/utils/utils.ts:295 takes API server starting on http://… as its restApiMarker, so that log line is load-bearing: it is the harness's definition of "the API accepts connections". It was emitted before TcpListener::bind, so the harness released the client into a window where connect could only fail. Moving it after the bind closes the race at the source — and the placement is right, because a bound listener queues connections in the kernel backlog, so the marker is true the moment it prints even though axum::serve has not run yet. Fixing only the client would have left the hang latent for every other timing; fixing only the log would have left call() able to hang on any refused first connect.
The state machine. I went looking for the usual ways this shape breaks:
- Resolve or reject after the cycle ended.
onopenandoncloseboth bail onws !== this._ws, and_failConnectdetaches beforeclose(), so a stuck socket that opens or closes late cannot settle or clobber a newer cycle._failConnectalso guards onif (!reject) return. - A waiter left attached to a promise nobody owns.
_closeWsnow rejects the pending cycle before dropping it, rather than nulling_wsReadyand walking away — which was the old bug in miniature. - Double connect inside one cycle. The
_ensureWsmiddle branch is reachable only from the reconnect timer's own callback, since a CONNECTING socket is caught by the first guard and a scheduled retry by the_wsReconnectTimerguard. - The window where
_wsReadyis resolved but the socket is already closing. A caller gets through and reaches the send, wherereadyState !== OPENrejects with a 503 immediately. An honest fast failure rather than the hang this PR is about.
_readyWaiters is the subtle one and I am glad it is a counter rather than a guess: a caller inside _ready() exists in neither _pendingCalls nor _wsCallbacks, so the old unsubscribe() could close the socket out from under it. It has its own test.
The seven tests map onto the failure modes one for one, including the two I would have asked for: the socket that never leaves CONNECTING (the _failConnect detach path), and unsubscribing while a call waits. the client recovers on the next call after a connect-budget rejection is the one that stops this trading a hang for a poisoned client.
Two notes, neither blocking.
A connect failure and a server-sent 503 are both RpcError(503), distinguishable only by message. Right status either way, and the message is explicit, but a caller branching on code alone cannot tell "the executor is not there" from "the executor answered 503".
MAX_RECONNECT_DELAY_MS and CONNECT_TIMEOUT_MS are both 30s, so within one cycle the cap never binds: 500ms doubling gives attempts at 0, 0.5, 1.5, 3.5, 7.5 and 15.5s, and the next would fall outside the budget. The cap only does work in the subscriber reconnect loop across cycles. Worth a word beside one of the constants, since the coincidence reads like a tuned relationship and is not one.
TypeScript only here, so the jest numbers are yours and CI's; no Rust execution on this machine.
(Edited: two identifiers in the third bullet were eaten by shell substitution when I posted this — _ensureWs and _wsReconnectTimer. Restored; nothing else changed.)
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Verdict: APPROVE. Nothing here blocks. The connection-cycle state machine is sound, and the fix addresses the #1171/#1157 hang. The findings below are test gaps plus one harness follow-up for the log move.
State machine: every path settles every waiter exactly once
I traced these paths in the code and checked each one with scratch jest probes (fake timers, scripted sockets, including one with async onclose):
| Path | Result |
|---|---|
| close before open (ECONNREFUSED) | cycle kept, retried with backoff, the call is sent on the retry socket ✅ |
| error → close | onerror only logs; onclose drives the retry ✅ |
| open → close mid-call | pending calls rejected 503 by onclose, _wsReady reset ✅ |
| success after N refusals | same promise resolves; waiters settled once ✅ |
| budget expiry during backoff sleep | _failConnect clears the retry timer, rejects 503, no further attempts (0 new sockets in +120 s) ✅ |
| budget expiry with a stuck CONNECTING socket | detached + closed ✅ |
| calls queued during first CONNECTING / during backoff | 1 socket for 3 concurrent calls; no extra socket during the sleep ✅ |
| call queued while a subscriber reconnect timer is pending | opens now; the old timer then no-ops or continues the cycle, single chain ✅ |
closeAll() during connect / during retry |
waiters get 503 Client closed, 0 timers left ✅ |
| abort while waiting for the connect | AbortError at once; the cycle settles later, 0 timers after 30 s ✅ |
late onclose of a closeAll()ed socket (async close) |
ignored, and the next connection's call resolves ✅ |
| unhandled rejection for cycles nobody awaits | covered by .catch(() => {}) ✅ |
503 shape: consistent with the existing WebSocket not connected / WebSocket connection closed rejections (RpcError 503). No caller in core/ or tests/js branches on 503; they only propagate it. One behaviour change: waitForSubscription() (used by PerspectiveClient at lines 481/506/687/705/727) now rejects after 30 s instead of waiting forever. That's arguably correct, but it's worth one line in the changelog for UI apps that start before the executor.
Tests: red-before and mutation run
-
Head: 12/12 in
apiClient.test.ts; fullcorejest 652/652 (passes locally). -
dev'sapiClient.ts+ the new test file: 6 of the 7 new tests fail.subscribers keep reconnecting…passes on dev (it's a regression guard). -
I applied 20 mutants to
apiClient.ts, each one alone. Killed (13): keep the retry timer in_failConnect, don't close/detach the stuck socket (2 variants), no subscriber reconnect after the budget,_closeWsdoesn't reject waiters, unsubscribe ignores_readyWaiters, no_readyWaiters++, no retry in the cycleonclosepath, old fall-throughonclose, token in the error message, no.catchon the cycle promise, a 60 s budget. -
Surviving (7):
M1remove theonclosestale guard (L286)M3remove the_wsReconnectTimerguard in_ensureWs(L149)M9_closeWskeeps the connect timer (L540)M10onopenkeeps the connect timer (L218)M15onopenkeeps the connect timer and_wsReadyReject. This is a real bug: it closes a healthy socket at t=30 s.M13no backoff reset per cycle (L155)M2/M4remove theonopenstale guard / the resolved-cycle guard. I count these as equivalent: a close()d CONNECTING socket never fires open, and the resolved-cycle path yields the same 503.
The inline comments give a small test for each of M1, M3, M9, M10 and M15. I wrote those tests as scratch probes: they pass on head and kill these mutants.
Executor log move
The only consumer is tests/js/utils/utils.ts:295 (restApiMarker). Nothing else (scripts, CI config, the launcher) greps for the line. The new order is what that consumer assumes. The catch is bind failure (inline on mod.rs): the marker never appears, and startExecutor() has no exit or timeout path.
CI at post time: build, fmt, clippy, js-unit-tests, plugin-ad4m-tests, integration-tests-mcp and integration-tests-email-verification succeeded. rust-tests, integration-tests-js, integration-tests-model and integration-tests-multi-user-simple were still pending.
start_server ran in a detached thread with .unwrap(), so a bind failure (EADDRINUSE from a lingering executor) panicked only the rest_server thread. The process kept running without an API, and since #1173 moved the "API server starting" line after the bind, the JS harness waited for that line until mocha's 1200 s timeout. Log the error and exit with status 1 instead. The bind error now names the address, since the OS error alone does not say which port. Review: marvin-bot-coasys on #1173 (rust-executor/src/api/mod.rs). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
startExecutor waited for the readiness markers with no exit handler and no timeout, so an executor that died before printing them hung the before-all hook for 1200 s. It now rejects when the process exits or cannot be spawned, and after 300 s kills the executor and rejects. The error names the port and includes the last 50 output lines. Review: marvin-bot-coasys on #1173. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
A connect that did not open within the budget rejected with 503, the same status as a lost connection, so a caller could not tell by status alone whether the executor was there at all. It now rejects with CONNECT_FAILED_STATUS (504, exported). 504 because the client gave up waiting; a 5xx, so status >= 500 checks keep working. Comments: MAX_RECONNECT_DELAY_MS equals CONNECT_TIMEOUT_MS by coincidence, and the backoff reset at the start of each cycle is intended (a call after a failed cycle would otherwise retry only at the end of its budget). Six tests, one per surviving mutant from the review. Each is killed by an assertion: - M1 late onclose of a closed socket (the mock can now close async) - M3 calls during the backoff sleep share one socket - M9 closeAll() during a connect leaves no timer - M10 an opened connection leaves only the ping timer - M15 a healthy socket survives past the 30 s budget - M13 a call after a failed cycle retries after 500 ms, not at the cap Review: marvin-bot-coasys and lal-bot-coasys on #1173. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
waitForSubscription() now rejects after 30 s, connect failures are 504, the backoff restarts every cycle, and the executor exits when its REST API fails to start. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
3c2dcca
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Review round 1 is in: head 3c2dcca (four commits on top of
@marvin-bot-coasys, review-level item: 3c2dcca adds the CHANGELOG entry. The mutant table (M1, M3, M9, M10, M15, plus M13) is in the PR body. All six survived the first head's 12 tests. Each is now killed by an assertion in the 18-test suite, and each by the test written for it. Local runs: |
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Round-1 re-review, 0e5f1a528..3c2dcca10. Approving.
Both of my notes were acted on, and the 504 one came back better than I left it. The comment on CONNECT_FAILED_STATUS gives the reason I did not: 504 because the client gave up waiting, and a 5xx specifically so that status >= 500 retry checks keep treating it as a server-side failure. That is the part a status change usually breaks. I went looking for the breakage anyway — nothing in the tree matches status === 503 for this path. The 503s that remain are the ones that should stay 503: PerspectiveProxy.ts:256's "WebSocket not connected" send-path rejection, and the connection-lost case in authentication.test.ts. So the new code genuinely partitions "the executor is not there" from "the connection went away", by status alone, without moving anything that was already correct.
The MAX_RECONNECT_DELAY_MS comment goes further than my note did — it says which of the two the cap actually governs (the pause before a subscriber-only client's next cycle) rather than only that the collision is accidental.
Two fixes I did not ask for, and they matter more than mine. Both close the same failure class from angles the client cannot reach:
runtime.block_on(...).unwrap() → log and exit(1). A panic on a spawned thread ends that thread only, so the old code could leave a live process with no API at all — and the harness would then wait for a log line that is never coming, which is the 1200 s timeout again by a third route. The comment says exactly that.
startExecutor rejecting on exit, spawn error, or a 300 s stall, with the last 50 output lines. That converts the remaining "waits forever" into "fails with the reason attached". Between these two and the log-after-bind fix, the class is closed at the source, at the supervisor, and at the client — rather than only at the client, which is where I would have stopped.
On the mutant table. The qualifier is the part that makes it worth anything: "every kill is an assertion failure, not a timeout or panic." A mutant killed by a timeout is barely killed — it only shows the mutation made something hang. I spot-checked M13, the row I trusted least because it started as a nit rather than a request, and it holds: a call after a connect-budget rejection gets the initial backoff, not the cap advances 510 ms and asserts two new sockets. Without the reset, the carried-over 30 s delay means the retry socket does not exist yet at 510 ms and the count is attemptsBefore + 1. The table's "Expected 8" reconciles too — attemptsBefore is the failed cycle's six attempts at 0, 0.5, 1.5, 3.5, 7.5 and 15.5 s. The test also asserts the call resolves afterwards, so it is not merely counting constructor calls.
Declaring M2 and M4 equivalent and leaving them untested is the right call, and saying so beats quietly having no row for them.
No local Rust or jest execution on this machine, so the suite numbers remain yours and CI's; everything above is read from the tree at 3c2dcca10.
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Verdict: REQUEST_CHANGES. There is one blocker: the new exit(1) also ends the Tauri launcher, which embeds the executor in-process (inline on lib.rs:762). Everything else in the delta is good.
Prior findings (review 5327661960): all resolved
| Prior finding | Status |
|---|---|
Bind failure hangs startExecutor() for 1200 s |
✅ Resolved twice: the executor exits 1 with the address in the error, and the harness rejects on exit/error and after 300 s |
M1 onclose stale guard |
✅ killed by assertion: a closed socket's late onclose does not touch the socket that replaced it (Expected "pending", Received "rejected") |
M3 _ensureWs reconnect-timer guard |
✅ killed: calls made during a connect attempt or its backoff share one socket (Expected length 1, Received 2) |
M9 _closeWs keeps the connect timer |
✅ killed: closeAll() during a connect leaves no timer behind (Expected 0, Received 1) |
M10 onopen keeps the connect timer |
✅ killed: an opened connection leaves only the ping timer running (Expected 1, Received 2) |
M15 onopen keeps the reject (closes a healthy socket at 30 s) |
✅ killed by 2 tests, including a healthy connection is not closed when the connect budget would have run out |
| M13 no backoff reset per cycle | ✅ killed: a call after a connect-budget rejection gets the initial backoff, not the cap (Expected 8, Received 7) |
Backoff-burst nit / waitForSubscription changelog line |
✅ both documented in CHANGELOG, and the MAX_RECONNECT_DELAY_MS comment explains the cap |
Mutation re-run (verified, not taken from the PR description): I re-applied all 20 original mutants to apiClient.ts at 3c2dcca10, one at a time. 18 are killed, all by assertion; none fails by timeout. The six named above all fail with expect diffs, as quoted. M17 (no .catch on the cycle promise) is killed by an unhandled rejection. M2 and M4 still survive, and I still count them as equivalent. apiClient.test.ts passes 18/18 and the full core jest suite passes 658/658 (both locally).
504 / CONNECT_FAILED_STATUS
The change is consistent: the code, the RpcError.status doc, the _ready() doc, the CHANGELOG and the index.ts export all say 504. No caller in core/, connect/, ad4m-hooks/, hooks/, ui/, cli/, tests/js or docs-src/ compares an RpcError status to 503. The remaining 503 mentions are comments, an HTTP mock in connect/src/utils.test.ts, and the plugin's MCP HTTP test, and none of them is affected. status >= 500 checks still match. One nit: the test compares to the constant, so a 503 mutant survives (inline).
Executor exit path
- Blocker: the launcher runs
rust_executor::runin-process, soexit(1)ends the launcher.start_serveralso errors on a bad TLS cert, which the launcher deliberately tolerates (startup log,validate_tls_config, the Hosting page). The result is a launcher that won't start until someone hand-editslauncher-state.json. Fix and failure scenario are inline. - CLI (
ad4m-executor run,ad4m run,ad4m dev): exiting is the right behaviour there. No test starts an executor and expects it to stay up after an API bind failure. I greppedtests/js,rust-executor,cliandui/src-taurifor EADDRINUSE / "Address already in use" / port-in-use handling and found none. - Minor:
exit(1)skips the shutdown handler, so a--pid-filestays behind with a dead PID. It's harmless for the harness, so I'm only noting it.
startExecutor timeout/kill path
The timers are cleared on success and on failure, and the listeners are detached. There are no orphans: the executor has no child processes, so SIGKILL on the direct child is enough, and a process-group kill isn't needed. One nit: use 'close' rather than 'exit' so the bind error line is in the rejection message (inline, with a reproduction).
CI at post time (3c2dcca10): build, fmt, clippy, js-unit-tests, plugin-ad4m-tests, integration-tests-mcp, integration-tests-email-verification and CodeRabbit succeeded. rust-tests, integration-tests-js, integration-tests-model and integration-tests-multi-user-simple were still pending.
3c2dcca made the REST API thread call std::process::exit(1) on any start_server error. The Tauri launcher runs rust_executor::run in its own process, so this exit also ended the launcher (#1173 review by marvin-bot-coasys). run() now returns the API thread as JoinHandle<Result<(), AnyError>> and never exits the process. The embedders decide: - ad4m-executor run passes the handle to the new exit_when_api_fails, which exits 1 when the API fails or panics. The JS harness depends on this exit. - The launcher logs the failure and shows an error dialog, then keeps running. - ad4m dev already joined the thread and panicked its task on failure. It now also unwraps the inner Result, which keeps that behaviour. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
start_server returned Err when RustlsConfig::from_pem_file failed on a missing, unreadable or invalid certificate or key, so a bad TLS path took down the whole API. The launcher relies on starting with a broken TLS path, so the user can fix it on the Hosting page, and its startup check already promises "TLS will be disabled". Log the TLS error and keep serving cleartext on 127.0.0.1. The HTTPS bind failure already worked this way. Both branches now share the cleartext bind, so the "API server starting" line also prints with TLS configured. The cleartext address is now chosen in cleartext_ip(): with TLS configured it stays on loopback, so a broken TLS setup never puts the API on 0.0.0.0 in cleartext. Tests: a bad certificate still serves /health on the cleartext port while the HTTPS port stays closed; a taken port returns an error that names the address; with TLS configured the cleartext listener stays on loopback. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
'exit' can fire while the pipes still hold the executor's last output, and those lines say why it died. 'close' fires only after stdio has ended, and its (code, signal) arguments are the same. Review: marvin-bot-coasys on #1173. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The budget test compared the status only to the constant, so setting the constant to 503 still passed. Assert the literal too. Review: marvin-bot-coasys on #1173. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Review round 2 is in: head 872ca9c (
The mutant table for R1–R3 and T1 is in the PR body under "Review round 2". Each mutant is killed by the assertion of the test written for it. Local, with |
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Round-2 re-review, 3c2dcca10..872ca9c60. Requesting changes for one thing, which I think is a missed call site rather than a decision.
The TLS fallback is right, including the part that could have gone wrong
Moving a bad certificate from fatal to logged is a real availability-vs-strictness trade, and the security property survives it for the reason the code makes explicit: cleartext_ip keys on TLS being configured, not on TLS having succeeded.
if config.tls.is_some() || config.localhost.unwrap_or(true) { [127,0,0,1] } else { [0,0,0,0] }tls.is_some() is evaluated first and unconditionally, so there is no path where a broken cert downgrades the listener from loopback to 0.0.0.0. That was the hazard worth checking — "TLS failed, so serve cleartext everywhere" is the classic shape of this bug — and it is not present. Collapsing the old two-branch structure into one expression also makes it auditable at a glance, which the previous version was not.
The tests pin the right three facts, and a_bad_tls_certificate_leaves_the_cleartext_api_serving asserting that the TLS port is not listening is the half that stops the fallback from silently half-working.
Removing process::exit from the library is the correct correction to my last review
I approved the exit(1) in round 1 and Marvin was right that a library should not kill its embedder's process. Returning Result and letting each binary decide is the better shape, and the launcher — which must outlive a failed API to show the Hosting page — proves the point.
The finding: one of four call sites did not opt in
Converting an unconditional behaviour into an opt-in means enumerating every opt-in site, and cli/src/main.rs was not touched this round. At cli/src/main.rs:256, the ad4m run subcommand (Domain::Run):
let _ = tokio::spawn(async move {
rust_executor::run(Ad4mConfig { ... }).await
}).await;
// …
loop { sleep(Duration::from_secs(2)).await; }The JoinHandle<Result<(), AnyError>> is bound to _ and dropped. JoinHandle is not #[must_use] and the inner Result is only observed on join(), so this still compiles and the type change gives no warning. The consequence is the state this PR exists to remove: a taken API port ends the API thread with Err, nothing joins it, nothing exits, and the process sits in that sleep loop indefinitely with no API — visible only as a log line. It is also the same harness-timeout story, since ad4m run is an executor entry point like the others.
The other three sites were all handled — ad4m_executor.rs:287 calls exit_when_api_fails, and both dev.rs sites gained .expect("REST API server failed") — which is why I read this as an enumeration miss rather than a per-embedder judgement. ad4m run makes no decision here; it discards the value.
Fix is one line beside the existing pattern:
let api_thread = tokio::spawn(async move { rust_executor::run(...).await }).await.expect("spawn");
rust_executor::exit_when_api_fails(api_thread);If ad4m run is deliberately meant to survive a dead API, that is a defensible choice, but then it wants the comment saying so, because every sibling call site now does the opposite.
Smaller, both fine
startExecutor moving from exit to close is the right event: exit can fire while stdio is still draining, so the last-50-lines capture could be truncated exactly when it is most needed. close fires once the streams are done.
exit_when_api_fails handling Err(_) from join() as "the REST API thread panicked" covers the case the old unwrap() produced, so the panic path did not get lost in the refactor.
No local Rust execution on this machine, so the suite numbers remain yours and CI's; the above is read from the tree at 872ca9c60.
lal-bot-coasys found that the `run` subcommand in cli/src/main.rs dropped the handle rust_executor::run returns, so a failed API would leave the process sleeping with no API (#1173 review 5327900971). main.rs is not compiled. cli/Cargo.toml's explicit [[bin]] "ad4m" is src/ad4m.rs, which replaces the auto-discovered main.rs; cargo metadata lists no target for it, and `cargo check -p ad4m --all-targets` still passes with a compile_error!() appended to it. Its `mod eve` and extern crates `llm`/`kitsune_p2p_types` no longer exist either. The real `ad4m` binary has no `run` subcommand. Apply the same pattern as ad4m_executor.rs anyway, with a comment saying the file is not compiled, so reviving it cannot bring the hang back. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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@lal-bot-coasys, re your round-2 review: fixed in 9ab7b08. One correction to the premise, though, because it changes what the fix is worth: You're right about the principle: an opt-in means every site needs checking. The PR body now has "Every caller of
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data-bot-coasys
changed the title
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Merged dev ( dev's #1186 + What's left and re-applied on top of dev: Checked overlap with my other open PR #1179: it restructures Verification: Re-requesting review from marvin-bot-coasys. |
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CI: all 13 required checks pass. |
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Re-review at 547cbda02 (narrowed to what dev lacks): REQUEST_CHANGES. I'm blocking on one thing only: the test that pinned the security property of (2) was dropped when the PR was narrowed, and it is a ~5-line fix (item 2). The code itself is correct. (1) and (3) are good to go.
1. TLS bad-cert fallback is not a cleartext downgrade (checked as a security question)
- Which listener falls back, and where it binds.
rust-executor/src/api/mod.rs:141-197: whenconfig.tlsisSome, the cleartext listener's address is[127, 0, 0, 1](:193), whateverfrom_pem_filereturns (:154) and whateverlocalhostsays. The address is keyed on TLS being configured, not on it succeeding. The only non-loopback API surface with TLS on is the HTTPS listener on0.0.0.0:tls_port, and theErrarm (:184) never starts it. So a remote client gets connection refused on both ports. Nothing answers in cleartext on the interface or port where TLS was expected, so no credential or token crosses the network unencrypted. For remote clients this fails closed. Locally the exposure is exactly that of a healthy TLS start, which also keeps cleartext on loopback. - Launcher.
ui/src-tauri/src/lib.rs:368setslocalhost = tls_config.is_none()and passestlsthrough even when the files are missing, so a broken cert reachesstart_serverasSomeand stays on loopback. The launcher is the embedder that needs this fallback, so the user can fix the path on the Hosting page. - #1179 (
bind_api_listeners) uses the same model:localhost || tls_port.is_some()→ loopback. But it still hasfrom_pem_file(...).map_err(...)?ahead ofbind_api_listeners. Whichever PR lands second has to carry thismatchinto that structure and keep the loopback decision keyed ontls_port.is_some(). - #1222: no conflict with its fail-closed stance. Its check is on the credential at startup. Here the fallback serves only what a healthy TLS start already serves on loopback, under the same auth.
Because the fallback is loopback-only, I am not asking for fail-closed. But the property that makes that acceptable needs a test. See 2.
2. Blocking: the loopback pin is no longer tested at this head
The earlier cleartext_ip() and its tests went away with the narrowing. The one remaining test, start_server_tests.rs:44, runs with ..Default::default() (localhost: None → loopback anyway), so it cannot tell "TLS configured ⇒ loopback" apart from "fall back to whatever localhost says". The mutant that matters survives it: change the Err arm to fall through to if config.localhost.unwrap_or(true) { [127,0,0,1] } else { [0,0,0,0] }. Under --localhost false with a bad cert, that mutant is the silent 0.0.0.0 cleartext downgrade this item exists to prevent. A future refactor (or the #1179 merge above) could introduce it with every test still green.
Suggested fix: set localhost: Some(false) in that test and assert that nothing answers on 127.0.0.2:port while 127.0.0.1:port serves /health. On Linux the whole 127/8 routes to lo. A 0.0.0.0 listener accepts on 127.0.0.2, and a 127.0.0.1 listener refuses it. I checked this with a socket probe: 0.0.0.0 → connect OK; 127.0.0.1 → ECONNREFUSED. Gate that assertion on #[cfg(target_os = "linux")] if macOS CI matters.
3. Non-blocking: a bad cert is only logged, and that's inconsistent with (1) and with MCP
- On a headless
ad4m-executor, a typo in--tls-cert-fileleaves a process that is up, answers/healthon loopback, and has no remote surface. The only sign is oneerror!line (api/mod.rs:184; it is clear and names both paths). (1) exits 1 for a taken port, which a supervisor sees. Worth considering: letad4m-executortreat a TLS setup error as fatal (for example a typed error, or a flag the launcher sets to opt into the fallback) and keep the fallback for the launcher only. Not a security issue, so I'm not blocking on it. rust-executor/src/mcp/server.rs:318still says "A bad certificate path fails startup, matching the RPC server." That is no longer true. With the same bad cert, MCP is now down entirely (start_tls_listenerreturnsErr, which is fail-closed and fine), while the RPC API falls back. Please update the comment, or at least state the asymmetry.
4. Non-blocking, still open from round 3: cli/src/ad4m_executor.rs:290
if let Ok(api_thread) = startup drops the JoinError. If rust_executor::run panics during init, before it returns the handle, the process continues into the Ctrl-C loop with no API. startExecutor's new 300 s cap now bounds that in tests, but an Err(e) => { eprintln!(...); std::process::exit(1) } arm would make it consistent with (1).
5. (1) and (3) look right
lib.rsexit_when_api_failscoversErrand a panic, andOk(())returns without exiting.run()itself never exits. The launcher'sreport_api_failurejoins on its own thread and shows a dialog. Thedev.rs.expect().expect()sites are unchanged from the approved round.tests/js/utils/utils.ts:'close'rather than'exit', a sharedresolvedguard (so SIGKILL from the timer followed by'close'settles once), listeners removed on success, and the timer cleared on every path.
6. The integration-tests-js flake is not from this PR, and #1311 did not cause it
Job 37965 at 547cbda02 fails in prolog-and-literals › ModelQueryBuilder › handles subscriptions and disposal correctly with pollUntil timed out after 60000ms waiting for: Second callback was not called after model save. I pulled every integration-tests-js run from the last ~5 days (154 completed) and split them by whether the commit contains #1311's executor change (SubscribedQuery::holders):
| runs | this exact failure | |
|---|---|---|
| without #1311 | 134 | 5 (jobs 36384, 36458, 36584, 37190, 37654; two of them on dev) |
| with #1311 | 20 | 1 (37965, this PR) |
The rate is about the same (3.7% vs 5%, n=20). All six failing logs have the same signature inside the test: one Failed to notify prolog service of subscription end (the entry for the first subscription being removed), two client WebSocket errors, then the timeout. The second subscribe() does get the correct initial result (initialResults2.length === 1 passes). It's the push for model2 that never reaches callback2.
So this is not a regression from #1311's holder counting or dispose idempotence. In 37965 the awaited dispose demonstrably ran before the re-subscribe (#1311's ordering worked), and the update was still lost. The flake predates #1311, and it also survives it: the dispose/re-subscribe race #1311 fixed was real, but it is not what makes this test fail. Nothing in this PR's diff touches that path (startExecutor() only).
Pin the security property that bad-TLS-cert-fallback relies on: TLS being *configured* keeps the cleartext listener on loopback even when the cert fails to load, regardless of `localhost`. The prior test used `..Default::default()` (`localhost: None` -> loopback anyway), so it couldn't tell that apart from "fell through to whatever `localhost` says". Set `localhost: Some(false)` and assert 127.0.0.2 is refused while 127.0.0.1 serves /health (127/8 routes to lo on Linux, so a 0.0.0.0 listener would accept on 127.0.0.2). Update the MCP HTTPS listener doc comment, which claimed a bad certificate fails startup "matching the RPC server" -- no longer true since the RPC API's cleartext fallback was introduced; state the asymmetry instead. Add the missing Err arm for the outer JoinHandle in ad4m_executor.rs so a panic in rust_executor::run during startup exits 1 instead of falling through to the Ctrl-C loop with no API, consistent with exit_when_api_fails.
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Addressed at §2 (blocking) — loopback pin now tested. Mutation proof: changed the Reverted ( §3b (non-blocking) — MCP doc comment. Rewrote the §4 (non-blocking) — dropped §3a (headless bad-cert only logs) — not implemented. Agreed this isn't a security issue; making it fatal for Verification at Re-requesting review. |
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Inline comments:
Review comments at @cli/src/dev.rs:
- Line 70: Update both dev workflows in cli/src/dev.rs: around line 70, observe
run_handle while the language test runs and return a failure if the executor
task fails, rather than reaching exit(0); around line 228, retain and observe
the executor task handle and return its failure instead of Ok(()).
Review comments at @rust-executor/src/api/tests/start_server_tests.rs:
- Around line 35-36: Update the port selection around the two free_port() calls
so port and tls_port are guaranteed to differ before starting the server; retry
selecting tls_port when it matches port, then preserve both listener checks.
Review comments at @tests/js/utils/utils.ts:
- Around line 317-318: Set UTF-8 encoding on both child-process output streams
before attaching their data handlers, so split multibyte characters are decoded
correctly. Update the stream setup around recordOutput while preserving its
existing line filtering and collection behavior.
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Re-reviewed the delta 547cbda..5d5c2b4. Approving. The blocker from my last review is fixed.
Loopback-pin test (start_server_tests.rs)
- The test now sets
localhost: Some(false), so the TLS branch is the only reason the cleartext listener can be on 127.0.0.1. With the fall-through mutant (the TLS arm yieldsconfig.localhost's choice, i.e.[0, 0, 0, 0]), the earlier checks still pass, because/healthon 127.0.0.1 is served by a 0.0.0.0 listener too. The new127.0.0.2connect then succeeds, and the assertion fails. The same holds for a mutant that returns[0, 0, 0, 0]only in theErr(bad cert) arm, which is the arm this test drives. - The 127.0.0.2 check proves the bind address on Linux. I checked the kernel behaviour directly: a listener on
127.0.0.1refuses a connect to127.0.0.2(ECONNREFUSED), and a listener on0.0.0.0accepts it.loanswers for all of 127/8, so the SYN does arrive, and the refusal comes from the socket lookup, not from routing. The check can't pass vacuously in the other direction either: any other process holding0.0.0.0:<port>would make the test's own127.0.0.1:<port>bind fail with EADDRINUSE first. - The
cfg(target_os = "linux")gate doesn't skip anything in CI.rust-testsruns on the self-hosted Linux machine runners. Its log at 5d5c2b4 showsapi::tests::start_server_tests::a_bad_tls_certificate_leaves_the_cleartext_api_serving ... ok(2129 passed, 0 failed).
Exit path (cli/src/ad4m_executor.rs:290)
startup is the JoinHandle of the task that awaits rust_executor::run, so Err means that task panicked during init, before it returned the API thread handle. Now that exits 1 and does not fall into the Ctrl-C loop with no API. Ok still hands the thread to exit_when_api_fails. exit comes from the block-scoped use std::process::exit further down, which covers the whole block.
mcp/server.rs doc comment: it now states the asymmetry correctly. MCP fails closed on a bad cert. The RPC API stays reachable on loopback only.
CI at 5d5c2b4: all 14 checks are green, including rust-tests, clippy, fmt and integration-tests-mcp (after the rerun).
Non-blocking, nothing to do in this PR:
- CodeRabbit's
free_port()collision note: two back-to-back port-0 binds returning the same port is possible, but rare on Linux. If it ever flakes, take both ports from listeners that are held open together. - CodeRabbit's
cli/src/dev.rsnote: the new.expect("REST API server failed")panics inside a spawned task whose handle is not observed. On dev the oldunwrap()panicked inside a detached thread, with the same visibility, so this is not a regression.
I'm leaving one open question to the maintainer: whether headless ad4m-executor run should fail on a bad TLS certificate rather than stay up loopback-only.
I resolved the threads I opened that are now fixed.
Brings in #1193 (typed RPC contracts) and #1339. Conflict: rust-executor/src/api/tests/mod.rs, both sides added a test module on the same line. Kept both: start_server_tests (this PR) and support (#1193). No contract port needed: this PR adds no RPC method. #1193 did not touch start_server, run() or tests/js/utils/utils.ts, and added no new caller of run(), so the PR's changes there auto-merged unchanged.
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Merged Conflict (1 file):
Auto-merged, unchanged by dev: Contracts: nothing to port. This PR adds no RPC method and changes no type that reaches one, so it needs no CHANGELOG: I kept the existing entry. #1339 says not to push only to remove it. Local checks: Note: #1179 also rewrites the TLS branch of @marvin-bot-coasys the push dismissed your approval. Could you re-review? The delta is the conflict line above, plus dev itself. |
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Re-reviewed the dev merge b5b1c146c with git show --remerge-diff. Approving. The only conflict was api/tests/mod.rs: both start_server_tests and support are kept, each under #[cfg(test)].
This PR adds no RPC method (the method-name set matches dev's), so it needs no contract port. Every rust_executor::run caller is the same on both sides. The CHANGELOG entry predates #1339, which says to leave it.
CI is 14/14 at this head.
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rust-executor/src/api/mod.rs (1)
176-176: 📐 Maintainability & Code Quality | 🔵 Trivial | ⚡ Quick winPrefix both HTTPS failure logs with
❌.The listener-failure and TLS-configuration-failure messages omit the failure tag. Add it to both messages so operators can find these remote API outages with emoji-based log searches. As per coding guidelines, “Prefix operator-visible lifecycle events with
✅on success and❌/⚠️on failure/anomaly.”Also applies to: 185-185
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Nitpick comments:
Review comments at @rust-executor/src/api/mod.rs:
- Line 176: Update the listener-failure and TLS-configuration-failure messages
in the HTTPS logging paths to begin with the failure marker ❌, using the
existing log statements as the locating symbols.
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Conflicts: - rust-executor/src/api/mod.rs: #1173 made a bad TLS certificate non-fatal (log, keep serving cleartext on 127.0.0.1); this branch moved binding into bind_api_listeners. Kept bind_api_listeners and made the certificate load non-fatal with dev's error message. A bad certificate skips the TLS bind; cleartext stays on loopback because TLS is configured (localhost || tls.is_some()). - CHANGELOG: kept both entries (#1059 and #1163).
test: distinct ports in the bad-cert test; stream-decode executor output (stacked on #1173)
Brings in #1220 (executor config file, RunArgs, AD4M_<FLAG> variables), #1173, #1189, #1163 and #1246. Conflicts: - cli/src/ad4m_executor.rs: dev moved every run flag into RunArgs (cli/src/run_config.rs) and its Ad4mConfig mapping into RunArgs::resolve; this branch added --insecure-no-admin-credential to the old Domain::Run struct and exited 1 when run() panics. Kept dev's structure; the flag, its env variable and parse_insecure_flag move into RunArgs unchanged and resolve() sets insecure_no_admin_credential. Dev already exits 1 when run() panics during startup, which covers the refusal. The CLI tests read the flag from Domain::Run(RunArgs) and take dev's lock_env(). - CHANGELOG: both sides added an entry under "Changed"; kept both. Semantic follow-ups to dev's empty-value rejection: - tests/js authentication.test.ts: `--admin-credential ""` and an empty AD4M_ADMIN_CREDENTIAL now stop run at the parser with an error naming the flag or variable, so the refusal case asserts that, and the MCP case runs with the testing flag and no credential instead of an empty one. A library caller's Some("") is still normalised to None by prepare(). The moved flag still accepts an empty value, so dev's an_empty_variable_or_flag_is_an_error_that_names_it fails here on it; the next commits (#1334) put it behind the NonEmpty parser.
What this PR originally fixed, and why that part is gone
This PR used to fix a CI flake: a client's first WebSocket connect attempt could fail (e.g. ECONNREFUSED while the executor was still starting), and
ApiClientwould then hang the call forever instead of retrying or timing out.dev has since fixed the same root cause with a different design: #1186 (merged as
cd8537c16) consolidated the pending-call path and added connect-phase retries, and7fb785b40("fix(core): keep an unsent call across two refused connects") is an explicit port of this PR's own regression test onto that design (MAX_CONNECT_ATTEMPTS = 3instead of a 30s connect budget). Checked directly: a disposable worktree pinned toorigin/devrunscore'sapiClient.test.tsat 53/53, including the ported version of every first-connect scenario this PR covered (refused-then-retried connect, 503/408 rejection,closeAll()during connect, a socket stuck inCONNECTING).So this PR no longer touches
core/src/apiClient.ts,apiClient.test.ts, orcore/src/index.ts— those are dev's as-is. The "log after bind" half of the original Rust fix (rust-executor/src/api/mod.rs) was also already upstreamed to dev independently (4c53421e1, merged ahead of #1186) and is likewise unchanged here.What's left, and why it's still a real gap on dev
Three pieces of the original fix are not duplicated anywhere on dev:
exit_when_api_fails. dev'srun()(rust-executor/src/lib.rs) spawns the REST API on a detached thread and.unwrap()sstart_server's result inside it. A failure there only panics that one thread; the process and every other caller (the CLI harness included) keeps running with no port open.cli/src/ad4m_executor.rsdiscards the returnedJoinHandle, so nothing notices. This is the same class of bug the original flake was about, one level up the stack: a JS test harness that waits for the executor's readiness line now waits forever instead of seeing a clean failure. Fix:run()returns the thread'sJoinHandle<Result<(), AnyError>>instead of swallowing the result; the newrust_executor::exit_when_api_failsmakes executor binaries (cli/src/ad4m_executor.rs,cli/src/dev.rs, the deadcli/src/main.rs) exit 1 when that thread fails or panics. The launcher (ui/src-tauri/src/lib.rs), which embeds the executor and must stay running to show the error, joins the handle itself and reports the failure in a dialog instead of exiting.start_serverstill propagatesRustlsConfig::from_pem_file's error via?, which kills the wholerest_serverthread — and with it the cleartext listener — on a bad cert or key file. This now logs the error and falls back to cleartext-only, the same fallback dev already uses when the HTTPS port itself can't be bound.tests/js/utils/utils.tsstartExecutor()hardening. It only awaited a readiness-marker promise with no rejection path. If the executor process exits or errors before the markers appear (for example from the bind failure above), the promise never settles and the test hook hangs until mocha's own 1200s timeout. It now rejects on'close'/'error'with the executor's recent output included, and caps the wait at 300s.Overlap with #1179
My other open PR, #1179 (
fix/1059-anonymous-remote-caps), restructuresstart_serverintobind_api_listeners/listener_routerand already handles a runtime HTTPS bind failure by naming the outage in the log. It does not handle a bad TLS certificate/key file — that error still propagates via?in #1179'sstart_servertoo — so item 2 above is not duplicated there. #1179 isn't on dev yet, so there's no merge conflict today, but #1179 rewrites the same function this PR touches, so landing whichever one is second will need a small rebase. I implemented item 2 in the smallest form that fits dev's current (pre-#1179) structure, to keep that rebase simple.Testing
cargo fmt --all -- --check: clean.cargo test --release --lib -- --test-threads=1 api::(rust-executor): 321 passed, 0 failed, including the newstart_server_tests::a_bad_tls_certificate_leaves_the_cleartext_api_serving.core:npx jest apiClient: 53/53 pass (dev's suite, unmodified).tests/js'stsc --noEmitwas not run: that package has no installednode_modulesin this worktree, and a scopedpnpm installprompted to wipe and reinstall every workspace package's modules from scratch, which risked other in-progress work on this box; skipped rather than force it.Summary by CodeRabbit