Esempio n. 1
0
func metricsMiddleware(requestCount metrics.Counter) endpoint.Middleware {
	return func(next endpoint.Endpoint) endpoint.Endpoint {
		return func(ctx context.Context, request interface{}) (interface{}, error) {
			requestCount.Add(1)
			return next(ctx, request)
		}
	}
}
Esempio n. 2
0
func httpInstrument(requests metrics.Counter, duration metrics.Histogram) func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			requests.Add(1)
			defer func(begin time.Time) { duration.Observe(time.Since(begin).Nanoseconds()) }(time.Now())
			next.ServeHTTP(w, r)
		})
	}
}
Esempio n. 3
0
func instrument(requests metrics.Counter, duration metrics.TimeHistogram) func(Add) Add {
	return func(next Add) Add {
		return func(ctx context.Context, a, b int64) int64 {
			defer func(begin time.Time) {
				requests.Add(1)
				duration.Observe(time.Since(begin))
			}(time.Now())
			return next(ctx, a, b)
		}
	}
}
Esempio n. 4
0
// TestCounter puts some deltas through the counter, and then calls the value
// func to check that the counter has the correct final value.
func TestCounter(counter metrics.Counter, value func() float64) error {
	a := rand.Perm(100)
	n := rand.Intn(len(a))

	var want float64
	for i := 0; i < n; i++ {
		f := float64(a[i])
		counter.Add(f)
		want += f
	}

	if have := value(); want != have {
		return fmt.Errorf("want %f, have %f", want, have)
	}

	return nil
}