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sidecar: set to not ready when failing to fetch prometheus version #7291

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sidecar: set to not ready when failing to fetch prometheus version #7291

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c871ec2
sidecar: set to not ready when failing to fetch prometheus version
SamJamS Apr 19, 2024
12c399c
add TestSidecarNotReadyNoPrometheus
SamJamS Apr 19, 2024
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2 changes: 2 additions & 0 deletions cmd/thanos/sidecar.go
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Original file line number Diff line number Diff line change
Expand Up @@ -189,6 +189,8 @@ func runSidecar(
"msg", "failed to fetch prometheus version. Is Prometheus running? Retrying",
"err", err,
)
promUp.Set(0)
statusProber.NotReady(err)
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Can update here or default readiness to false at the beginning of runSidecar()

return err
}

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33 changes: 33 additions & 0 deletions test/e2e/query_test.go
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Expand Up @@ -235,6 +235,39 @@ func TestSidecarNotReady(t *testing.T) {
}))
}

func TestSidecarNotReadyNoPrometheus(t *testing.T) {
t.Parallel()

e, err := e2e.NewDockerEnvironment("sidecar-noProm")
testutil.Ok(t, err)
t.Cleanup(e2ethanos.CleanScenario(t, e))

// Start sidecar without ever starting Prometheus.
_, sidecar := e2ethanos.NewPrometheusWithSidecar(e, "alone", e2ethanos.DefaultPromConfig("prom-alone", 0, "", "", e2ethanos.LocalPrometheusTarget), "", e2ethanos.DefaultPrometheusImage(), "")
testutil.Ok(t, sidecar.Start())
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maybe use e2e.StartAndWaitReady() here, relying on sidecar's health endpoint as readiness check to make sure we have a running sidecar before testing?


ctx, cancel := context.WithCancel(context.Background())
defer cancel()

// Sidecar should not be ready if there was never a ready Prometheus.
testutil.Ok(t, runutil.Retry(1*time.Second, ctx.Done(), func() (rerr error) {
req, err := http.NewRequestWithContext(ctx, "GET", "http://"+sidecar.Endpoint("http")+"/-/ready", nil)
if err != nil {
return err
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
defer runutil.CloseWithErrCapture(&rerr, resp.Body, "closing resp body")

if resp.StatusCode == 200 {
return fmt.Errorf("got status code %d", resp.StatusCode)
}
return nil
}))
}

func TestQuery(t *testing.T) {
t.Parallel()

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