Move code to pkg

pkg/metrics/statsd.go

@@ -0,0 +1,86 @@
+package metrics
+
+import (
+	"context"
+	"time"
+
+	"github.com/containous/traefik/pkg/log"
+	"github.com/containous/traefik/pkg/safe"
+	"github.com/containous/traefik/pkg/types"
+	kitlog "github.com/go-kit/kit/log"
+	"github.com/go-kit/kit/metrics/statsd"
+)
+
+var statsdClient = statsd.New("traefik.", kitlog.LoggerFunc(func(keyvals ...interface{}) error {
+	log.WithoutContext().WithField(log.MetricsProviderName, "statsd").Info(keyvals)
+	return nil
+}))
+
+var statsdTicker *time.Ticker
+
+const (
+	statsdMetricsBackendReqsName      = "backend.request.total"
+	statsdMetricsBackendLatencyName   = "backend.request.duration"
+	statsdRetriesTotalName            = "backend.retries.total"
+	statsdConfigReloadsName           = "config.reload.total"
+	statsdConfigReloadsFailureName    = statsdConfigReloadsName + ".failure"
+	statsdLastConfigReloadSuccessName = "config.reload.lastSuccessTimestamp"
+	statsdLastConfigReloadFailureName = "config.reload.lastFailureTimestamp"
+	statsdEntrypointReqsName          = "entrypoint.request.total"
+	statsdEntrypointReqDurationName   = "entrypoint.request.duration"
+	statsdEntrypointOpenConnsName     = "entrypoint.connections.open"
+	statsdOpenConnsName               = "backend.connections.open"
+	statsdServerUpName                = "backend.server.up"
+)
+
+// RegisterStatsd registers the metrics pusher if this didn't happen yet and creates a statsd Registry instance.
+func RegisterStatsd(ctx context.Context, config *types.Statsd) Registry {
+	if statsdTicker == nil {
+		statsdTicker = initStatsdTicker(ctx, config)
+	}
+
+	return &standardRegistry{
+		enabled:                        true,
+		configReloadsCounter:           statsdClient.NewCounter(statsdConfigReloadsName, 1.0),
+		configReloadsFailureCounter:    statsdClient.NewCounter(statsdConfigReloadsFailureName, 1.0),
+		lastConfigReloadSuccessGauge:   statsdClient.NewGauge(statsdLastConfigReloadSuccessName),
+		lastConfigReloadFailureGauge:   statsdClient.NewGauge(statsdLastConfigReloadFailureName),
+		entrypointReqsCounter:          statsdClient.NewCounter(statsdEntrypointReqsName, 1.0),
+		entrypointReqDurationHistogram: statsdClient.NewTiming(statsdEntrypointReqDurationName, 1.0),
+		entrypointOpenConnsGauge:       statsdClient.NewGauge(statsdEntrypointOpenConnsName),
+		backendReqsCounter:             statsdClient.NewCounter(statsdMetricsBackendReqsName, 1.0),
+		backendReqDurationHistogram:    statsdClient.NewTiming(statsdMetricsBackendLatencyName, 1.0),
+		backendRetriesCounter:          statsdClient.NewCounter(statsdRetriesTotalName, 1.0),
+		backendOpenConnsGauge:          statsdClient.NewGauge(statsdOpenConnsName),
+		backendServerUpGauge:           statsdClient.NewGauge(statsdServerUpName),
+	}
+}
+
+// initStatsdTicker initializes metrics pusher and creates a statsdClient if not created already
+func initStatsdTicker(ctx context.Context, config *types.Statsd) *time.Ticker {
+	address := config.Address
+	if len(address) == 0 {
+		address = "localhost:8125"
+	}
+	pushInterval, err := time.ParseDuration(config.PushInterval)
+	if err != nil {
+		log.FromContext(ctx).Warnf("Unable to parse %s from config.PushInterval: using 10s as the default value", config.PushInterval)
+		pushInterval = 10 * time.Second
+	}
+
+	report := time.NewTicker(pushInterval)
+
+	safe.Go(func() {
+		statsdClient.SendLoop(report.C, "udp", address)
+	})
+
+	return report
+}
+
+// StopStatsd stops internal statsdTicker which controls the pushing of metrics to StatsD Agent and resets it to `nil`
+func StopStatsd() {
+	if statsdTicker != nil {
+		statsdTicker.Stop()
+	}
+	statsdTicker = nil
+}