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Commit623dcd9

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fix(cli): fix flakes related to context cancellation when establishing pg connections (#18246)
Since#18195 was merged, we startedrunning CLI tests with postgres instead of just dbmem. This surfacederrors related to context cancellation while establishing postgresconnections.This PR shouldfixcoder/internal#672. Relatedto#15109.
1 parentb5fd3dd commit623dcd9

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3 files changed

+17
-9
lines changed

3 files changed

+17
-9
lines changed

‎cli/clitest/clitest.go‎

Lines changed: 6 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -168,6 +168,12 @@ func StartWithAssert(t *testing.T, inv *serpent.Invocation, assertCallback func(
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switch {
169169
caseerrors.Is(err,context.Canceled):
170170
return
171+
caseerr!=nil&&strings.Contains(err.Error(),"driver: bad connection"):
172+
// When we cancel the context on a query that's being executed within
173+
// a transaction, sometimes, instead of a context.Canceled error we get
174+
// a "driver: bad connection" error.
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// https://github.com/lib/pq/issues/1137
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return
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default:
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assert.NoError(t,err)
173179
}

‎cli/server.go‎

Lines changed: 4 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -2359,6 +2359,10 @@ func ConnectToPostgres(ctx context.Context, logger slog.Logger, driver string, d
23592359
iferr!=nil {
23602360
returnnil,xerrors.Errorf("get postgres version: %w",err)
23612361
}
2362+
deferversion.Close()
2363+
ifversion.Err()!=nil {
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returnnil,xerrors.Errorf("version select: %w",version.Err())
2365+
}
23622366
if!version.Next() {
23632367
returnnil,xerrors.Errorf("no rows returned for version select")
23642368
}
@@ -2367,7 +2371,6 @@ func ConnectToPostgres(ctx context.Context, logger slog.Logger, driver string, d
23672371
iferr!=nil {
23682372
returnnil,xerrors.Errorf("scan version: %w",err)
23692373
}
2370-
_=version.Close()
23712374

23722375
ifversionNum<130000 {
23732376
returnnil,xerrors.Errorf("PostgreSQL version must be v13.0.0 or higher! Got: %d",versionNum)

‎coderd/database/pubsub/pubsub.go‎

Lines changed: 7 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -552,15 +552,14 @@ func (p *PGPubsub) startListener(ctx context.Context, connectURL string) error {
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sentErrCh=true
553553
}),
554554
}
555-
select {
556-
caseerr=<-errCh:
557-
iferr!=nil {
558-
_=p.pgListener.Close()
559-
returnxerrors.Errorf("create pq listener: %w",err)
560-
}
561-
case<-ctx.Done():
555+
// We don't respect context cancellation here. There's a bug in the pq library
556+
// where if you close the listener before or while the connection is being
557+
// established, the connection will be established anyway, and will not be
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// closed.
559+
// https://github.com/lib/pq/issues/1192
560+
iferr:=<-errCh;err!=nil {
562561
_=p.pgListener.Close()
563-
returnctx.Err()
562+
returnxerrors.Errorf("create pq listener: %w",err)
564563
}
565564
returnnil
566565
}

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