traefik/metrics/statsd.go

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package metrics
import (
"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/statsd"
)
var statsdClient = statsd.New("traefik.", kitlog.LoggerFunc(func(keyvals ...interface{}) error {
log.Info(keyvals)
return nil
}))
var statsdTicker *time.Ticker
const (
statsdMetricsReqsName = "requests.total"
statsdMetricsLatencyName = "request.duration"
statsdRetriesTotalName = "backend.retries.total"
)
// RegisterStatsd registers the metrics pusher if this didn't happen yet and creates a statsd Registry instance.
func RegisterStatsd(config *types.Statsd) Registry {
if statsdTicker == nil {
statsdTicker = initStatsdTicker(config)
}
return &standardRegistry{
enabled: true,
reqsCounter: statsdClient.NewCounter(statsdMetricsReqsName, 1.0),
reqDurationHistogram: statsdClient.NewTiming(statsdMetricsLatencyName, 1.0),
retriesCounter: statsdClient.NewCounter(statsdRetriesTotalName, 1.0),
}
}
// initStatsdTicker initializes metrics pusher and creates a statsdClient if not created already
func initStatsdTicker(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.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() {
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
}