70 lines
2 KiB
Go
70 lines
2 KiB
Go
package middlewares
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import (
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"net/http"
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"strconv"
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"time"
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"github.com/go-kit/kit/metrics"
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)
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// Metrics is an Interface that must be satisfied by any system that
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// wants to expose and monitor Metrics.
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type Metrics interface {
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getReqsCounter() metrics.Counter
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getReqDurationHistogram() metrics.Histogram
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RetryMetrics
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}
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// RetryMetrics must be satisfied by any system that wants to collect and
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// expose retry specific Metrics.
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type RetryMetrics interface {
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getRetryCounter() metrics.Counter
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}
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// MetricsWrapper is a Negroni compatible Handler which relies on a
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// given Metrics implementation to expose and monitor Traefik Metrics.
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type MetricsWrapper struct {
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Impl Metrics
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}
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// NewMetricsWrapper return a MetricsWrapper struct with
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// a given Metrics implementation e.g Prometheuss
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func NewMetricsWrapper(impl Metrics) *MetricsWrapper {
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var metricsWrapper = MetricsWrapper{
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Impl: impl,
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}
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return &metricsWrapper
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}
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func (m *MetricsWrapper) ServeHTTP(rw http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
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start := time.Now()
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prw := &responseRecorder{rw, http.StatusOK}
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next(prw, r)
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reqLabels := []string{"code", strconv.Itoa(prw.statusCode), "method", r.Method}
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m.Impl.getReqsCounter().With(reqLabels...).Add(1)
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reqDurationLabels := []string{"code", strconv.Itoa(prw.statusCode)}
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m.Impl.getReqDurationHistogram().With(reqDurationLabels...).Observe(float64(time.Since(start).Seconds()))
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}
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// MetricsRetryListener is an implementation of the RetryListener interface to
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// record Metrics about retry attempts.
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type MetricsRetryListener struct {
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retryMetrics RetryMetrics
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}
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// Retried tracks the retry in the Metrics implementation.
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func (m *MetricsRetryListener) Retried(attempt int) {
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if m.retryMetrics != nil {
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m.retryMetrics.getRetryCounter().Add(1)
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}
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}
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// NewMetricsRetryListener instantiates a MetricsRetryListener with the given RetryMetrics.
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func NewMetricsRetryListener(retryMetrics RetryMetrics) RetryListener {
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return &MetricsRetryListener{retryMetrics: retryMetrics}
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}
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