Add InfluxDB support for traefik metrics

metrics/influxdb.go

@@ -0,0 +1,90 @@
+package metrics
+
+import (
+	"bytes"
+	"time"
+
+	"github.com/containous/traefik/log"
+	"github.com/containous/traefik/safe"
+	"github.com/containous/traefik/types"
+	kitlog "github.com/go-kit/kit/log"
+	"github.com/go-kit/kit/metrics/influx"
+	influxdb "github.com/influxdata/influxdb/client/v2"
+)
+
+var influxDBClient = influx.New(map[string]string{}, influxdb.BatchPointsConfig{}, kitlog.LoggerFunc(func(keyvals ...interface{}) error {
+	log.Info(keyvals)
+	return nil
+}))
+
+type influxDBWriter struct {
+	buf    bytes.Buffer
+	config *types.InfluxDB
+}
+
+var influxDBTicker *time.Ticker
+
+const (
+	influxDBMetricsReqsName    = "traefik.requests.total"
+	influxDBMetricsLatencyName = "traefik.request.duration"
+	influxDBRetriesTotalName   = "traefik.backend.retries.total"
+)
+
+// RegisterInfluxDB registers the metrics pusher if this didn't happen yet and creates a InfluxDB Registry instance.
+func RegisterInfluxDB(config *types.InfluxDB) Registry {
+	if influxDBTicker == nil {
+		influxDBTicker = initInfluxDBTicker(config)
+	}
+
+	return &standardRegistry{
+		enabled:              true,
+		reqsCounter:          influxDBClient.NewCounter(influxDBMetricsReqsName),
+		reqDurationHistogram: influxDBClient.NewHistogram(influxDBMetricsLatencyName),
+		retriesCounter:       influxDBClient.NewCounter(influxDBRetriesTotalName),
+	}
+}
+
+// initInfluxDBTicker initializes metrics pusher and creates a influxDBClient if not created already
+func initInfluxDBTicker(config *types.InfluxDB) *time.Ticker {
+	address := config.Address
+	if len(address) == 0 {
+		address = "localhost:8089"
+	}
+
+	pushInterval, err := time.ParseDuration(config.PushInterval)
+	if err != nil {
+		log.Warnf("Unable to parse %s into pushInterval, using 10s as default value", config.PushInterval)
+		pushInterval = 10 * time.Second
+	}
+
+	report := time.NewTicker(pushInterval)
+
+	safe.Go(func() {
+		var buf bytes.Buffer
+		influxDBClient.WriteLoop(report.C, &influxDBWriter{buf: buf, config: config})
+	})
+
+	return report
+}
+
+// StopInfluxDB stops internal influxDBTicker which controls the pushing of metrics to InfluxDB Agent and resets it to `nil`
+func StopInfluxDB() {
+	if influxDBTicker != nil {
+		influxDBTicker.Stop()
+	}
+	influxDBTicker = nil
+}
+
+func (w *influxDBWriter) Write(bp influxdb.BatchPoints) error {
+	c, err := influxdb.NewUDPClient(influxdb.UDPConfig{
+		Addr: w.config.Address,
+	})
+
+	if err != nil {
+		return err
+	}
+
+	defer c.Close()
+
+	return c.Write(bp)
+}