traefik/middlewares/datadog.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/dogstatsd"
)
var _ Metrics = (*Datadog)(nil)
var _ RetryMetrics = (*Datadog)(nil)
var datadogClient = dogstatsd.New("traefik.", kitlog.LoggerFunc(func(keyvals ...interface{}) error {
log.Info(keyvals)
return nil
}))
var datadogTicker *time.Ticker
// Metric names consistent with https://github.com/DataDog/integrations-extras/pull/64
const (
ddMetricsReqsName = "requests.total"
ddMetricsLatencyName = "request.duration"
ddRetriesTotalName = "backend.retries.total"
)
// Datadog is an Implementation for Metrics that exposes datadog 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 Datadog struct {
reqsCounter metrics.Counter
reqDurationHistogram metrics.Histogram
retryCounter metrics.Counter
}
func (dd *Datadog) getReqsCounter() metrics.Counter {
return dd.reqsCounter
}
func (dd *Datadog) getReqDurationHistogram() metrics.Histogram {
return dd.reqDurationHistogram
}
func (dd *Datadog) getRetryCounter() metrics.Counter {
return dd.retryCounter
}
// NewDataDog creates new instance of Datadog
func NewDataDog(name string) *Datadog {
var m Datadog
m.reqsCounter = datadogClient.NewCounter(ddMetricsReqsName, 1.0).With("service", name)
m.reqDurationHistogram = datadogClient.NewHistogram(ddMetricsLatencyName, 1.0).With("service", name)
m.retryCounter = datadogClient.NewCounter(ddRetriesTotalName, 1.0).With("service", name)
return &m
}
// InitDatadogClient initializes metrics pusher and creates a datadogClient if not created already
func InitDatadogClient(config *types.Datadog) *time.Ticker {
if datadogTicker == 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() {
datadogClient.SendLoop(report.C, "udp", address)
})
datadogTicker = report
}
return datadogTicker
}
// StopDatadogClient stops internal datadogTicker which controls the pushing of metrics to DD Agent and resets it to `nil`
func StopDatadogClient() {
if datadogTicker != nil {
datadogTicker.Stop()
}
datadogTicker = nil
}