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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| package metrics | ||
|
|
||
| import ( | ||
| "go.opentelemetry.io/otel/metric" | ||
| ) | ||
|
|
||
| // AppMetrics holds all the application metrics | ||
| type AppMetrics struct { | ||
| metric.Meter | ||
|
|
||
| RegisteredPeers metric.Int64UpDownCounter | ||
| RegisterTimes metric.Float64Histogram | ||
| RegisterCalls metric.Int64Counter | ||
| DeregisterCalls metric.Int64Counter | ||
| } | ||
|
|
||
| func NewAppMetrics(meter metric.Meter) (*AppMetrics, error) { | ||
| registeredPeers, err := meter.Int64UpDownCounter("registered_peers_total") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| registerTimes, err := meter.Float64Histogram("register_times_milliseconds", | ||
| metric.WithExplicitBucketBoundaries(getStandardBucketBoundaries()...)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| registerCalls, err := meter.Int64Counter("register_calls_total") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| deregisterCalls, err := meter.Int64Counter("deregister_calls_total") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &AppMetrics{ | ||
| Meter: meter, | ||
| RegisteredPeers: registeredPeers, | ||
| RegisterTimes: registerTimes, | ||
| RegisterCalls: registerCalls, | ||
| DeregisterCalls: deregisterCalls, | ||
| }, nil | ||
| } | ||
|
|
||
| func getStandardBucketBoundaries() []float64 { | ||
| return []float64{ | ||
| 0.1, | ||
| 0.5, | ||
| 1, | ||
| 5, | ||
| 10, | ||
| 50, | ||
| 100, | ||
| 500, | ||
| 1000, | ||
| 5000, | ||
| 10000, | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| package metrics | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "net/http" | ||
| "reflect" | ||
|
|
||
| prometheus2 "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/prometheus/client_golang/prometheus/promhttp" | ||
| "go.opentelemetry.io/otel" | ||
| "go.opentelemetry.io/otel/exporters/prometheus" | ||
| api "go.opentelemetry.io/otel/metric" | ||
| "go.opentelemetry.io/otel/sdk/metric" | ||
| ) | ||
|
|
||
| const defaultEndpoint = "/metrics" | ||
|
|
||
| // Metrics holds the metrics information and exposes it | ||
| type Metrics struct { | ||
| Meter api.Meter | ||
| provider *metric.MeterProvider | ||
| Endpoint string | ||
|
|
||
| *http.Server | ||
| } | ||
|
|
||
| // NewServer initializes and returns a new Metrics instance | ||
| func NewServer(port int, endpoint string) *Metrics { | ||
| exporter, err := prometheus.New() | ||
| if err != nil { | ||
| return nil | ||
| } | ||
|
|
||
| provider := metric.NewMeterProvider(metric.WithReader(exporter)) | ||
| otel.SetMeterProvider(provider) | ||
|
|
||
| pkg := reflect.TypeOf(defaultEndpoint).PkgPath() | ||
| meter := provider.Meter(pkg) | ||
|
|
||
| if endpoint == "" { | ||
| endpoint = defaultEndpoint | ||
| } | ||
|
|
||
| router := http.NewServeMux() | ||
| router.Handle(endpoint, promhttp.HandlerFor( | ||
| prometheus2.DefaultGatherer, | ||
| promhttp.HandlerOpts{EnableOpenMetrics: true})) | ||
|
|
||
| server := &http.Server{ | ||
| Addr: fmt.Sprintf(":%d", port), | ||
| Handler: router, | ||
| } | ||
|
|
||
| return &Metrics{ | ||
| Meter: meter, | ||
| provider: provider, | ||
| Endpoint: endpoint, | ||
| Server: server, | ||
| } | ||
| } | ||
|
|
||
| // Shutdown stops the metrics server | ||
| func (m *Metrics) Shutdown(ctx context.Context) error { | ||
| if err := m.Server.Shutdown(ctx); err != nil { | ||
| return fmt.Errorf("http server: %w", err) | ||
| } | ||
|
|
||
| if err := m.provider.Shutdown(ctx); err != nil { | ||
| return fmt.Errorf("meter provider: %w", err) | ||
| } | ||
|
|
||
| return nil | ||
| } |
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