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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| package bucketeer | ||
|
|
||
| import ( | ||
| "context" | ||
| "sync" | ||
| "time" | ||
|
|
||
| "go.opencensus.io/stats" | ||
| "go.opencensus.io/stats/view" | ||
| "go.opencensus.io/tag" | ||
| ) | ||
|
|
||
|
|
||
| var ( | ||
| registerOnce sync.Once | ||
| latencyMs = stats.Int64("bucketeer_latency_distribution", "bucketeer api latency in milliseconds", stats.UnitMilliseconds) | ||
| counter = stats.Int64("bucketeer_call_count", "bucketeer api call count", stats.UnitDimensionless) | ||
| ) | ||
|
|
||
| var ( | ||
| KeyFeatureID = tag.MustNewKey("featureID") | ||
| KeyStatus = tag.MustNewKey("status") | ||
| ) | ||
|
|
||
| func RegisterMetrics() error { | ||
| views := []*view.View{ | ||
| { | ||
| Name: latencyMs.Name(), | ||
| Measure: latencyMs, | ||
| Description: latencyMs.Description(), | ||
| TagKeys: []tag.Key{KeyFeatureID, KeyStatus}, | ||
| Aggregation: newLatencyDistribution(), | ||
| }, | ||
| { | ||
| Name: counter.Name(), | ||
| Measure: counter, | ||
| Description: counter.Description(), | ||
| TagKeys: []tag.Key{KeyFeatureID, KeyStatus}, | ||
| Aggregation: view.Count(), | ||
| }, | ||
| } | ||
| var err error | ||
| registerOnce.Do(func() { | ||
| err = view.Register(views...) | ||
| }) | ||
| return err | ||
| } | ||
|
|
||
| func measure(ctx context.Context, v time.Duration) { | ||
| stats.Record(ctx, latencyMs.M(v.Milliseconds())) | ||
| } | ||
|
|
||
| func count(ctx context.Context) { | ||
| stats.Record(ctx, counter.M(1)) | ||
| } | ||
|
|
||
| func NewContext(ctx context.Context, featureID string) (context.Context, error) { | ||
| return tag.New( | ||
| ctx, | ||
| tag.Insert(KeyFeatureID, featureID), | ||
| ) | ||
| } | ||
|
|
||
| func newLatencyDistribution() *view.Aggregation { | ||
| const begin, count, exp = 25.0, 9, 2 | ||
| dist := make([]float64, count) | ||
| dist[0] = begin | ||
| for i := 1; i < count; i++ { | ||
| dist[i] = dist[i-1] * exp | ||
| } | ||
| return view.Distribution(dist...) | ||
| } |
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