fix(arkor): add an idle watchdog to the trainer SSE reconnect loop (#214) - #231
fix(arkor): add an idle watchdog to the trainer SSE reconnect loop (#214)#231Bishalsingh153 wants to merge 5 commits into
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…rkorlab#214) trainer.wait()'s SSE consumption had no timeout of its own: a silently stalled connection (NAT/LB idle eviction: no frame, no EOF, no RST) would hang wait() until undici's own headersTimeout/bodyTimeout implementation-detail eventually fired (300s default), which is not a contract this SDK controls. Add an idle watchdog per connection attempt: a fresh AbortController combined with the caller's abortSignal via AbortSignal.any. The watchdog rearms on every frame received, including keepalive pings, and fires after idleTimeoutMs (default 45s) of silence. A watchdog trip is routed through the existing handleFailure reconnect path exactly like any other transport failure; a genuine user abort (checked via the original abortSignal, not the combined one) still rejects wait() immediately without being counted as a reconnect failure. Adds a "hang" fetch-mock kind (stalls until the request's abort signal fires) plus four tests: stall-then-reconnect, immediate user-abort during a stall, a healthy stream whose pings keep the watchdog from firing despite exceeding idleTimeoutMs in total, and exhaustion when every attempt stalls. Two existing backoff-delay tests are updated to filter out the watchdog's own setTimeout calls, which the same spy now also captures.
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Walkthrough
ChangesSSE idle watchdog
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The PR improves recovery from silently stalled trainer connections, but one regression test does not exercise request-signal aborts and the updated documentation has a few inaccuracies, including the initial watchdog interval and a Japanese typo. The change is mergeable with explicit owner follow-up on these bounded issues. Sequence Diagram(s)sequenceDiagram
participant TrainerWait
participant IdleWatchdog
participant SSEStream
participant ReconnectHandler
TrainerWait->>IdleWatchdog: start per-stream timeout
SSEStream-->>TrainerWait: deliver SSE frame
TrainerWait->>IdleWatchdog: reset timeout
IdleWatchdog->>SSEStream: abort stalled read
SSEStream-->>ReconnectHandler: report watchdog failure
ReconnectHandler->>TrainerWait: open next stream
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Greptile SummaryThe PR adds a configurable per-connection idle watchdog to the trainer SSE reconnect loop while preserving immediate caller cancellation and avoiding timeout failures during lifecycle callbacks.
Confidence Score: 5/5The PR appears safe to merge. No blocking failure remains.
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| Filename | Overview |
|---|---|
| packages/arkor/src/core/trainer.ts | Adds validated idle-timeout configuration and a per-attempt watchdog whose timer is suspended during lifecycle callback processing. |
| packages/arkor/src/core/trainer.test.ts | Adds abort-aware stalled-stream fixtures and regression coverage for reconnects, caller cancellation, pings, retry exhaustion, and slow callbacks. |
| docs/sdk/trainer-control.mdx | Documents watchdog timing, reconnect behavior, callback exclusion, and internal configuration. |
| docs/ja/sdk/trainer-control.mdx | Adds the corresponding Japanese documentation for watchdog and reconnect semantics. |
Flowchart
%%{init: {'theme': 'neutral'}}%%
flowchart TD
A[Open SSE connection] --> B[Arm idle watchdog]
B --> C{Frame arrives before timeout?}
C -- No --> D[Abort connection]
D --> E[Handle transport failure]
E --> A
C -- Yes --> F[Clear watchdog]
F --> G{Frame type}
G -- Ping or malformed --> B
G -- Data event --> H[Await lifecycle callback]
H --> I{Terminal?}
I -- No --> B
I -- Yes --> J[Finish wait]
G -- End --> J
K[Caller abort] --> L[Reject immediately]
K -. combined signal .-> A
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| // Any frame at all, including a keepalive ping, proves the | ||
| // connection is still alive, so rearm the idle watchdog | ||
| // before doing anything else with the frame. | ||
| armWatchdog(); |
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When a nonterminal async callback takes longer than the default 45 seconds—especially an onCheckpoint callback performing the documented infer() evaluation—the watchdog remains armed while dispatch() awaits user code. It therefore aborts a healthy SSE connection because local callback processing is slow, causing the next iterator read to throw, consuming reconnect budget and potentially making wait() fail when retries are limited. Suspend the watchdog while dispatching callbacks and rearm it when the code resumes waiting for the next frame.
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| /** | ||
| * Maximum time in milliseconds to wait for any frame (a real event or | ||
| * a keepalive `ping`) before treating the connection as silently | ||
| * stalled and aborting the read, routing the abort into the normal | ||
| * reconnect path. Without this, a silently stalled connection (NAT/LB | ||
| * idle eviction: no frame, no EOF, no RST) would hang `wait()` until | ||
| * undici's own `headersTimeout` / `bodyTimeout` eventually fire | ||
| * (300_000 ms by default), which is an implementation detail of | ||
| * Node's fetch, not a contract this SDK controls. Defaults to 45_000 | ||
| * (45 s): comfortably above a normal keepalive-ping cadence, and well | ||
| * inside undici's 5-minute window. | ||
| */ | ||
| idleTimeoutMs?: number; |
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This introduces user-visible SDK behavior—wait() now aborts and reconnects a stream after 45 seconds without an SSE frame—but the change includes no English or Japanese documentation explaining the timeout or its reconnect semantics. Add the corresponding paired documentation so users can distinguish watchdog-driven reconnects from transport failures and understand the new behavior.
AGENTS.md reference: AGENTS.md:L98-L105
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Inline comments:
In `@packages/arkor/src/core/trainer.ts`:
- Around line 511-514: Update the SSE frame-processing loop around armWatchdog
and dispatch so the watchdog is cleared before awaiting dispatch and rearmed
immediately before the next iterator read, keeping it inactive during slow
callbacks. Add a regression test with an onLog callback longer than
idleTimeoutMs that receives an end frame and verifies streamOpens remains 1.
- Line 198: Validate context.idleTimeoutMs before assigning or scheduling the
watchdog: reject values below 1, NaN, and values above 2,147,483,647 by throwing
RangeError, while preserving the 45,000 ms default when unset. Add boundary
tests covering the minimum, maximum, and invalid values.
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1 issue found across 2 files
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<file name="packages/arkor/src/core/trainer.test.ts">
<violation number="1" location="packages/arkor/src/core/trainer.test.ts:1592">
P3: The "healthy stream" test is a real-timer race: pings are 60ms apart while the watchdog re-arms at 100ms, a ~40ms cushion that can evaporate under CI event-loop load. A stalled frame trips the watchdog, the app reconnects, and expect(streamOpens).toBe(1) turns the healthy-path test into an intermittent failure. Drive the watchdog and stream with fake timers (vi.useFakeTimers + vi.advanceTimersByTime) instead of real setTimeout so the test asserts re-arm behavior deterministically rather than betting on timer accuracy.</violation>
</file>
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| cwd, | ||
| ); | ||
| const idleTimeoutMs = 100; | ||
| const pingGapMs = 60; |
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P3: The "healthy stream" test is a real-timer race: pings are 60ms apart while the watchdog re-arms at 100ms, a ~40ms cushion that can evaporate under CI event-loop load. A stalled frame trips the watchdog, the app reconnects, and expect(streamOpens).toBe(1) turns the healthy-path test into an intermittent failure. Drive the watchdog and stream with fake timers (vi.useFakeTimers + vi.advanceTimersByTime) instead of real setTimeout so the test asserts re-arm behavior deterministically rather than betting on timer accuracy.
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Check if this issue is valid — if so, understand the root cause and fix it. At packages/arkor/src/core/trainer.test.ts, line 1592:
<comment>The "healthy stream" test is a real-timer race: pings are 60ms apart while the watchdog re-arms at 100ms, a ~40ms cushion that can evaporate under CI event-loop load. A stalled frame trips the watchdog, the app reconnects, and expect(streamOpens).toBe(1) turns the healthy-path test into an intermittent failure. Drive the watchdog and stream with fake timers (vi.useFakeTimers + vi.advanceTimersByTime) instead of real setTimeout so the test asserts re-arm behavior deterministically rather than betting on timer accuracy.</comment>
<file context>
@@ -1449,12 +1485,215 @@ describe("createTrainer (reconnect backoff + max attempts)", () => {
+ cwd,
+ );
+ const idleTimeoutMs = 100;
+ const pingGapMs = 60;
+ let streamOpens = 0;
+ const fetcher: typeof fetch = (async (
</file context>
Three issues found by automated review (Greptile, Codex, CodeRabbit, cubic) on the initial watchdog implementation: 1. The watchdog stayed armed while dispatch() awaited a user lifecycle callback (e.g. a slow onCheckpoint doing an infer() call), so a healthy connection with a merely slow callback could trip the watchdog and burn reconnect budget for no transport reason. Fixed by clearing the watchdog as soon as any frame arrives (proving liveness) and only rearming once dispatch() has resolved and the loop is about to wait on the next frame, so the timer now measures only network silence between frames, never local callback time. 2. idleTimeoutMs had no validation. Node's setTimeout silently coerces NaN, values <= 0, and values above its 32-bit signed-int ceiling down to a ~1ms timer instead of erroring. Added an eager RangeError check in createTrainer() so a bad value fails loudly instead of silently misbehaving. 3. The "healthy stream" ping test drove real setTimeout with only a ~40ms cushion between the ping cadence and the watchdog timeout, making it a potential CI flake. Rewritten to use vi.useFakeTimers() with vi.advanceTimersByTimeAsync() so the re-arm behavior is asserted deterministically instead of racing real wall-clock time. Also adds a regression test for issue 1 (a slow onLog callback must not trigger a reconnect), using small real timers rather than fake timers since fake timers interact poorly with the underlying SSE stream's own internal scheduling in this test harness.
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Inline comments:
In `@packages/arkor/src/core/trainer.test.ts`:
- Around line 1698-1758: Update the stream fixture in the slow-callback
regression test so it remains open after the log frame, propagates init.signal
aborts by erroring the stream controller, and emits the end frame only after the
callback delay. Keep the assertion that trainer.wait() completes with exactly
one stream open, ensuring the test distinguishes an armed watchdog from callback
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packages/arkor/src/core/trainer.ts (2)
206-213: Reject values below 1 ms.
idleTimeoutMs = 0.5passes this validation. Node cannot schedule that delay exactly and coerces it to a 1 ms timer. Require an integer value greater than or equal to 1, and add a boundary test for0.5.For Node.js 22.22.0, how does setTimeout handle a delay of 0.5 milliseconds?
54-66: LGTM!Also applies to: 456-496, 527-555, 582-592
packages/arkor/src/core/trainer.test.ts (1)
727-778: LGTM!
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Codex review flagged that the new watchdog behavior (wait() now detects a silently stalled SSE connection and reconnects instead of hanging) had no user-facing documentation, per AGENTS.md's rule that docs land in the same PR as the behavior change. Adds idleTimeoutMs to the existing "known internal context fields" list in create-trainer.mdx (English and Japanese), and a new bullet in trainer-control.mdx's Reconnects section (English and Japanese) describing the watchdog: what triggers it, how it composes with handleFailure, and that it measures only network silence between frames (not callback processing time), matching the existing documentation style and precedent for the other @internal reconnect knobs (reconnectDelayMs, maxReconnectDelayMs, maxReconnectAttempts). Verified with `mint validate`.
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In `@docs/sdk/create-trainer.mdx`:
- Line 32: The internal context description is overly broad because it lists
only reconnect fields; update the wording to “documented reconnect fields” in
both docs/sdk/create-trainer.mdx:32-32 and docs/ja/sdk/create-trainer.mdx:32-32,
preserving the existing localized documentation meaning.
In `@docs/sdk/trainer-control.mdx`:
- Line 107: The watchdog documentation must cover the initial connection
interval, including the period before openEventStream() receives its first
frame. Update the description in docs/sdk/trainer-control.mdx at lines 107-107
and align the equivalent Japanese description in docs/ja/sdk/trainer-control.mdx
at lines 107-107; no implementation change is requested.
Apply the same fix in `@docs/ja/sdk/trainer-control.mdx` at line 107: The Japanese
watchdog description contains the identified spelling error.
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…rlab#214) CodeRabbit and cubic both caught that the previous version of this test used a fixture (sseStream) that queued both SSE frames and closed the stream synchronously at creation time, before onLog's delay even started. The "end" frame was already available regardless of watchdog behavior, so the test could not actually fail even with the bug present, a false negative. Rewritten with a bespoke mock stream that stays genuinely open during the callback delay and propagates the request's abort signal into the stream (erroring the controller), so a premature watchdog trip actually manifests as a real transport failure the way it would against a live connection. Verified this catches the regression: manually reverted the timing fix locally (rearming instead of clearing the watchdog on frame arrival) and confirmed this test fails against that reverted code, then confirmed it passes again once the fix was restored.
) CodeRabbit review caught three issues in the previous docs commit: 1. "its known fields" implied TrainerInternalContext's baseUrl, credentials, and cwd fields were also covered by the linked Reconnects section, when only the reconnect-related knobs are. Reworded to "documented reconnect-related fields" in both languages to remove the ambiguity without documenting the other fields (which are self-explanatory test/override knobs, not reconnect behavior). 2. The watchdog description didn't make clear that the timer starts before openEventStream() is even called, so it also covers the initial wait for the first frame, not just gaps between frames already received. Clarified in both languages. 3. A Japanese typo: スタール (a mistyped katakana rendering) should be ストール ("stall"). Fixed. Verified with `mint validate`.
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Fixes #214.
trainer.wait()'s SSE consumption had no idle timeout of its own: a silently stalled connection (NAT/LB idle eviction: no frame, no EOF, no RST) would hangwait()until undici's ownheadersTimeout/bodyTimeoutimplementation-detail timeouts eventually fired (300s default), which is not a contract this SDK controls.This adds an idle watchdog per connection attempt: a fresh
AbortControllercombined with the caller'sabortSignalviaAbortSignal.any. The watchdog rearms on every frame received, including keepalivepings, and fires afteridleTimeoutMs(default 45s) of silence. A watchdog trip is routed through the existinghandleFailurereconnect path exactly like any other transport failure. A genuine user abort (checked via the originalabortSignal, not the combined one) still rejectswait()immediately without being counted as a reconnect failure.Testing:
"hang"fetch-mock kind (stalls until the request's abort signal fires) to the test suite'sstreamFetcherhelperidleTimeoutMsin total, and exhaustion when every attempt stallssetTimeoutcalls, which the same spy now also capturesarkorpackage test suite passes (461/461)e2e-clisuite passes (110/110, 6 skipped as usual)pnpm build,pnpm typecheck,pnpm lint,pnpm format:check,pnpm check:no-em-dashall pass repo-wideSummary by cubic
Detects and recovers silently stalled SSE connections in the
arkortrainer. Previouslytrainer.wait()could hang until undici’s ~300s internal timeouts; now a per-connection idle watchdog aborts and reconnects afteridleTimeoutMs(45s default) with no frames. The timer starts before opening the stream, measures only network silence between frames, and won’t misfire during long callbacks.idleTimeoutMs; throws a RangeError if non-finite, <= 0, or > 2_147_483_647 ms. Reconnect/backoff logic unchanged.Migration
idleTimeoutMsvia the secondcontextargument tocreateTrainer(..., { idleTimeoutMs })if you need a different threshold; fix any invalid values that now throw.idleTimeoutMssentinel.Written for commit c6a00da. Summary will update on new commits.
Summary by CodeRabbit
Bug Fixes
New Features
Documentation