fix(worker): a worker that cannot see Docker now says so - #333
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📝 WalkthroughWalkthroughThe worker now tracks Docker availability transitions, detects outages during container status enumeration, and re-probes unavailable daemons. Deployment validation runs in a worker thread to prevent event-loop blocking. ChangesDocker availability and deployment flow
Estimated code review effort: 3 (Moderate) | ~20 minutes Mergeability Score: 🟠 High · up to The worker can still report misleading health or partial deployment status during Docker failures, while runtime validation may block the service and return the wrong client error during daemon outages. These merge-readiness issues should be fixed before merging, along with the smaller resource-leak and test-credential concerns. Possibly related PRs
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## main #333 +/- ##
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+ Coverage 95.41% 95.51% +0.10%
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Files 51 51
Lines 7060 7091 +31
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+ Hits 6736 6773 +37
+ Misses 324 318 -6
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Actionable comments posted: 4
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Inline comments:
In `@app/orchestrator.py`:
- Around line 687-701: Update the later external-container list call in
get_status so its exception handler invokes _mark_docker_unavailable with the
failure context and exception, then returns no status result instead of
returning partial results; preserve the existing labeled-list handling and
successful-list behavior.
- Around line 87-95: Update the Docker probe around client.ping() to close the
initialized client in a guarded finally block, including when ping raises;
preserve the existing availability marking and return behavior in the probe
function.
In `@app/worker_api.py`:
- Around line 1275-1281: Update the Docker client boundary used by
available_runtimes to apply an explicit shorter request timeout. In
_validate_deploy_spec, preserve existing validation HTTPException responses, but
distinguish Docker probe failures: log the failure and raise an HTTP 503 instead
of treating the result as an empty runtime set and returning 400.
In `@tests/test_docker_honesty.py`:
- Line 21: Replace the hard-coded value assigned by the CASHPILOT_API_KEY setup
with a test-only value generated at runtime or require the credential from the
test environment, while preserving the test’s existing environment
initialization behavior.
🪄 Autofix
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
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📒 Files selected for processing (3)
app/orchestrator.pyapp/worker_api.pytests/test_docker_honesty.py
Three verified findings from the invisible-failure audit: - Docker dying MID-LIFE was a logger.debug — invisible at the default INFO level. The worker silently degraded to monitor-only, every deploy 503'd, and docker logs held no reason at all. The True->False transition now warns once (and only the mid-life transition: startup discovering a monitor-only worker stays quiet, lifespan already announces the mode), and recovery is announced. - 'Ping works, list fails' (daemon 500, read timeout, containerd hiccup) escaped get_status entirely: the heartbeat shipped containers=[] WITH docker_available=true, so the worker looked online and deliberately empty while the UI wrote a durable check_down every 5 minutes for each deployment it could no longer see — the exact false-downtime regression the health-check guard exists to prevent, reintroduced through a flag that could lie. The enumeration failure now flips the availability memo so the SAME heartbeat reports blind. - The deploy route ran _validate_deploy_spec unthreaded, and its runtime validation does a live Docker round-trip (available_runtimes has no cache, no timeout, and builds a fresh client per call): a wedged daemon blocked the whole event loop — including /api/health, flipping the container unhealthy because an unrelated route was stuck. Threaded via to_thread like every sibling Docker touch; HTTPException propagates unchanged. 7 tests incl. negative controls (startup quiet, first success silent, healthy list keeps the flag). The threading test measures event-loop ticks DURING the call and is mutation-verified — its first version measured a later window and could not fail; the docstring records that lesson. Full suite 4671 passed, coverage 95.75%.
… 503 Review round on #333: - The external-container list in get_status swallowed its failure and returned partial results with the availability flag still true — external deployments read as DOWN instead of Docker-blind. Both list calls now flag the outage and return []; and the same pair of holes existed wholesale in get_status_light, so it got the identical treatment (the mirror of the mirror). - available_runtimes distinguishes 'daemon unreachable' (None -> 503 at both callers) from 'no such runtime installed' (set() -> 400): the collapse told the operator to fix their runtime choice when the fix was the daemon. The probe uses its own 5s-timeout client — the shared client keeps the SDK's long default because deploys legitimately take minutes — and closes it on every path. - docker_available's probe client is closed even when ping raises. Two pre-existing tests pinned the partial-results contract and were updated to blind-not-partial with the reasoning in comments; runtime tests now pin the None/503 vs set()/400 split, the probe timeout, and the client close. Full suite 4705 passed, coverage 95.54%. Declined (answered on-thread): replacing the suite-wide test key fixture, same reasoning as #332.
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Why
Part of the invisible-failure audit that followed the 42-hour incident. A worker whose Docker daemon dies keeps running — and today it does so silently: the failed ping is a
logger.debugnobody can see at the default INFO level, the availability memo can keep answeringtrueagainst a daemon that only half-works, and one route can block the whole event loop on that daemon and take/api/healthdown with it.What
True→Falseis the loud moment; a persisting outage stays quiet, and startup discovery of a deliberately monitor-only worker stays quiet too (lifespan already announces the mode).get_status, so the heartbeat shippedcontainers=[]withdocker_available=true— an online-looking, deliberately-empty worker, while the UI wrote a durablecheck_downevery 5 minutes for each deployment it could no longer see (the exact false-downtime regression the health-check guard exists to prevent, reintroduced through a flag that could lie). The enumeration failure now flips the memo so the same heartbeat reports blind._validate_deploy_specruns viato_threadlike every sibling Docker touch — its runtime validation does a live daemon round-trip with no cache and no timeout (fresh client + ping + info per call), and unthreaded it blocked everything including/api/health, flipping the container unhealthy because an unrelated route was stuck. Only reachable when a spec explicitly names a runtime (the UI never does), which is why this is the smallest of the three.Testing
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