traefik/middlewares/statsd.go

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package middlewares
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"
"github.com/go-kit/kit/metrics/statsd"
)
var _ Metrics = (*Statsd)(nil)
var _ RetryMetrics = (*Statsd)(nil)
var statsdClient = statsd.New("traefik.", kitlog.LoggerFunc(func(keyvals ...interface{}) error {
log.Info(keyvals)
return nil
}))
var statsdTicker *time.Ticker
// Statsd is an Implementation for Metrics that exposes statsd metrics for the latency
// and the number of requests partitioned by status code and method.
// - number of requests partitioned by status code and method
// - request durations
// - amount of retries happened
type Statsd struct {
reqsCounter metrics.Counter
reqDurationHistogram metrics.Histogram
retryCounter metrics.Counter
}
func (s *Statsd) getReqsCounter() metrics.Counter {
return s.reqsCounter
}
func (s *Statsd) getReqDurationHistogram() metrics.Histogram {
return s.reqDurationHistogram
}
func (s *Statsd) getRetryCounter() metrics.Counter {
return s.retryCounter
}
// NewStatsD creates new instance of StatsD
func NewStatsD(name string) *Statsd {
var m Statsd
m.reqsCounter = statsdClient.NewCounter(ddMetricsReqsName, 1.0).With("service", name)
m.reqDurationHistogram = statsdClient.NewTiming(ddMetricsLatencyName, 1.0).With("service", name)
m.retryCounter = statsdClient.NewCounter(ddRetriesTotalName, 1.0).With("service", name)
return &m
}
// InitStatsdClient initializes metrics pusher and creates a statsdClient if not created already
func InitStatsdClient(config *types.Statsd) *time.Ticker {
if statsdTicker == nil {
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)
})
statsdTicker = report
}
return statsdTicker
}
// StopStatsdClient stops internal statsdTicker which controls the pushing of metrics to StatsD Agent and resets it to `nil`
func StopStatsdClient() {
if statsdTicker != nil {
statsdTicker.Stop()
}
statsdTicker = nil
}