diff options
Diffstat (limited to 'vendor/github.com/prometheus/client_golang/prometheus/go_collector_test.go')
-rw-r--r-- | vendor/github.com/prometheus/client_golang/prometheus/go_collector_test.go | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/vendor/github.com/prometheus/client_golang/prometheus/go_collector_test.go b/vendor/github.com/prometheus/client_golang/prometheus/go_collector_test.go new file mode 100644 index 000000000..9a8858cbd --- /dev/null +++ b/vendor/github.com/prometheus/client_golang/prometheus/go_collector_test.go @@ -0,0 +1,123 @@ +package prometheus + +import ( + "runtime" + "testing" + "time" + + dto "github.com/prometheus/client_model/go" +) + +func TestGoCollector(t *testing.T) { + var ( + c = NewGoCollector() + ch = make(chan Metric) + waitc = make(chan struct{}) + closec = make(chan struct{}) + old = -1 + ) + defer close(closec) + + go func() { + c.Collect(ch) + go func(c <-chan struct{}) { + <-c + }(closec) + <-waitc + c.Collect(ch) + }() + + for { + select { + case metric := <-ch: + switch m := metric.(type) { + // Attention, this also catches Counter... + case Gauge: + pb := &dto.Metric{} + m.Write(pb) + if pb.GetGauge() == nil { + continue + } + + if old == -1 { + old = int(pb.GetGauge().GetValue()) + close(waitc) + continue + } + + if diff := int(pb.GetGauge().GetValue()) - old; diff != 1 { + // TODO: This is flaky in highly concurrent situations. + t.Errorf("want 1 new goroutine, got %d", diff) + } + + // GoCollector performs two sends per call. + // On line 27 we need to receive the second send + // to shut down cleanly. + <-ch + return + } + case <-time.After(1 * time.Second): + t.Fatalf("expected collect timed out") + } + } +} + +func TestGCCollector(t *testing.T) { + var ( + c = NewGoCollector() + ch = make(chan Metric) + waitc = make(chan struct{}) + closec = make(chan struct{}) + oldGC uint64 + oldPause float64 + ) + defer close(closec) + + go func() { + c.Collect(ch) + // force GC + runtime.GC() + <-waitc + c.Collect(ch) + }() + + first := true + for { + select { + case metric := <-ch: + switch m := metric.(type) { + case *constSummary, *value: + pb := &dto.Metric{} + m.Write(pb) + if pb.GetSummary() == nil { + continue + } + + if len(pb.GetSummary().Quantile) != 5 { + t.Errorf("expected 4 buckets, got %d", len(pb.GetSummary().Quantile)) + } + for idx, want := range []float64{0.0, 0.25, 0.5, 0.75, 1.0} { + if *pb.GetSummary().Quantile[idx].Quantile != want { + t.Errorf("bucket #%d is off, got %f, want %f", idx, *pb.GetSummary().Quantile[idx].Quantile, want) + } + } + if first { + first = false + oldGC = *pb.GetSummary().SampleCount + oldPause = *pb.GetSummary().SampleSum + close(waitc) + continue + } + if diff := *pb.GetSummary().SampleCount - oldGC; diff != 1 { + t.Errorf("want 1 new garbage collection run, got %d", diff) + } + if diff := *pb.GetSummary().SampleSum - oldPause; diff <= 0 { + t.Errorf("want moar pause, got %f", diff) + } + return + } + case <-time.After(1 * time.Second): + t.Fatalf("expected collect timed out") + } + } +} |