Move code to pkg

pkg/metrics/datadog.go

@@ -0,0 +1,88 @@
+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/dogstatsd"
+)
+
+var datadogClient = dogstatsd.New("traefik.", kitlog.LoggerFunc(func(keyvals ...interface{}) error {
+	log.WithoutContext().WithField(log.MetricsProviderName, "datadog").Info(keyvals)
+	return nil
+}))
+
+var datadogTicker *time.Ticker
+
+// Metric names consistent with https://github.com/DataDog/integrations-extras/pull/64
+const (
+	ddMetricsBackendReqsName      = "backend.request.total"
+	ddMetricsBackendLatencyName   = "backend.request.duration"
+	ddRetriesTotalName            = "backend.retries.total"
+	ddConfigReloadsName           = "config.reload.total"
+	ddConfigReloadsFailureTagName = "failure"
+	ddLastConfigReloadSuccessName = "config.reload.lastSuccessTimestamp"
+	ddLastConfigReloadFailureName = "config.reload.lastFailureTimestamp"
+	ddEntrypointReqsName          = "entrypoint.request.total"
+	ddEntrypointReqDurationName   = "entrypoint.request.duration"
+	ddEntrypointOpenConnsName     = "entrypoint.connections.open"
+	ddOpenConnsName               = "backend.connections.open"
+	ddServerUpName                = "backend.server.up"
+)
+
+// RegisterDatadog registers the metrics pusher if this didn't happen yet and creates a datadog Registry instance.
+func RegisterDatadog(ctx context.Context, config *types.Datadog) Registry {
+	if datadogTicker == nil {
+		datadogTicker = initDatadogClient(ctx, config)
+	}
+
+	registry := &standardRegistry{
+		enabled:                        true,
+		configReloadsCounter:           datadogClient.NewCounter(ddConfigReloadsName, 1.0),
+		configReloadsFailureCounter:    datadogClient.NewCounter(ddConfigReloadsName, 1.0).With(ddConfigReloadsFailureTagName, "true"),
+		lastConfigReloadSuccessGauge:   datadogClient.NewGauge(ddLastConfigReloadSuccessName),
+		lastConfigReloadFailureGauge:   datadogClient.NewGauge(ddLastConfigReloadFailureName),
+		entrypointReqsCounter:          datadogClient.NewCounter(ddEntrypointReqsName, 1.0),
+		entrypointReqDurationHistogram: datadogClient.NewHistogram(ddEntrypointReqDurationName, 1.0),
+		entrypointOpenConnsGauge:       datadogClient.NewGauge(ddEntrypointOpenConnsName),
+		backendReqsCounter:             datadogClient.NewCounter(ddMetricsBackendReqsName, 1.0),
+		backendReqDurationHistogram:    datadogClient.NewHistogram(ddMetricsBackendLatencyName, 1.0),
+		backendRetriesCounter:          datadogClient.NewCounter(ddRetriesTotalName, 1.0),
+		backendOpenConnsGauge:          datadogClient.NewGauge(ddOpenConnsName),
+		backendServerUpGauge:           datadogClient.NewGauge(ddServerUpName),
+	}
+
+	return registry
+}
+
+func initDatadogClient(ctx context.Context, config *types.Datadog) *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() {
+		datadogClient.SendLoop(report.C, "udp", address)
+	})
+
+	return report
+}
+
+// StopDatadog stops internal datadogTicker which controls the pushing of metrics to DD Agent and resets it to `nil`.
+func StopDatadog() {
+	if datadogTicker != nil {
+		datadogTicker.Stop()
+	}
+	datadogTicker = nil
+}