fix(cli): poll GetServices as a fallback when WaitServiceState reconnects - #2243
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…ects A reconnected log-tail stream only observes state changes from the moment it opens; if the target health transition happened while the previous stream was stalled, no amount of reconnecting can ever see it again. On GCP this manifests as an infinite reconnect loop that never resolves on its own (#2241), even though #2237 correctly made the stall visible instead of silent. WaitServiceState now polls GetServices — which reads current state independent of the log tail — right after a transient-error backoff and before re-subscribing, so a missed transition is caught without needing another round-trip through the stream. Fixes #2241
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ChangesService state recovery
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The change adds a focused service-state polling fallback to prevent reconnect loops, with targeted tests and reported lint/test checks passing; no actionable merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant WaitServiceState
participant Subscribe
participant GetServices
WaitServiceState->>Subscribe: receive transient stream error
WaitServiceState->>GetServices: poll current service states
GetServices-->>WaitServiceState: return services
WaitServiceState->>WaitServiceState: filter matching etag and tracked services
WaitServiceState-->>WaitServiceState: return target state or deployment failure
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Full details: Linked Issues checkExplanation The changes address issue
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Inline comments:
In `@src/pkg/cli/subscribe_test.go`:
- Line 346: Extend TestWaitServiceStatePollFallbackOnStalledStream with
table-driven cases where GetServices returns an error and where the service
reaches BUILD_FAILED or DEPLOYMENT_FAILED. Assert polling continues after the
provider error and returns client.ErrDeploymentFailed for both failed states,
while preserving the existing target-state and mismatched-ETag coverage.
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src/pkg/cli/subscribe.gosrc/pkg/cli/subscribe_test.go
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Addresses CodeRabbit review on #2243: the poll-fallback test only covered the target-state and mismatched-etag cases. Add cases for a GetServices error (confirms polling isn't fatal and keeps retrying) and for BUILD_FAILED/DEPLOYMENT_FAILED observed via poll (confirms ErrDeploymentFailed propagates the same as the stream path).
Small observability addition: when the GetServices poll fallback already shows the target state, log it at debug level so a DEFANG_DEBUG=1 run shows why no further stream reconnects happened — directly useful for diagnosing the #2241 class of symptom in the field.
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All checks green (go-test, nix-shell-test, CodeQL/Analyze, CodeRabbit review completed and approved) and |
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Recurred again just now on main (post-PR): Deploy Sample to gcp BYOC run, triggered by defang@main push at |
2 participants
Summary
Root cause (from #2241):
WaitServiceState's reconnect-on-transient-error path opens a freshprovider.Subscribestream, which on GCP starts a brand-new forward-only log query. If the one-time health-transition log entry was emitted while the previous stream was stalled, no amount of reconnecting can ever re-observe it — every reconnect behaves identically (idle, then reconnect) forever, until the caller's own context deadline kills it.Fix
Provider.GetServicesalready exists and, for GCP, reads current service state from a project-update object independent of the log tail.WaitServiceStatenow polls it right after the transient-error backoff and before re-subscribing:BUILD_FAILED/DEPLOYMENT_FAILEDstateThis addresses the reconnect-loop for any transient error that causes a resubscribe (idle timeout,
Unavailable,Internal,ResourceExhausted), not just the idle-timeout case from #2237.Testing
go test -short ./pkg/cli/...— all packages pass, including new tests:TestWaitServiceStatePollFallbackOnStalledStream/poll_observes_target_state_...— a stream that always errors transiently, paired with aGetServicesmock returningDEPLOYMENT_COMPLETED, resolves successfully instead of looping..../poll_ignores_services_with_a_mismatched_etag— a poll response for a different etag doesn't short-circuit; the wait proceeds (and times out via context, as expected in the test).make lint— clean on the changed files (20 pre-existinggosecfindings elsewhere onmainare unrelated).Fixes #2241
Summary by CodeRabbit