traefik/pkg/metrics/metrics_test.go

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package metrics
import (
"bytes"
"strings"
"testing"
"time"
"github.com/go-kit/kit/metrics"
"github.com/go-kit/kit/metrics/generic"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestScalableHistogram(t *testing.T) {
h := generic.NewHistogram("test", 1)
sh, err := NewHistogramWithScale(h, time.Millisecond)
require.NoError(t, err)
ticker := time.NewTicker(500 * time.Millisecond)
<-ticker.C
start := time.Now()
<-ticker.C
sh.ObserveFromStart(start)
var b bytes.Buffer
h.Print(&b)
extractedDurationString := strings.Split(strings.Split(b.String(), "\n")[1], " ")
measuredDuration, err := time.ParseDuration(extractedDurationString[0] + "ms")
assert.NoError(t, err)
assert.InDelta(t, 500*time.Millisecond, measuredDuration, float64(15*time.Millisecond))
}
func TestNewMultiRegistry(t *testing.T) {
registries := []Registry{newCollectingRetryMetrics(), newCollectingRetryMetrics()}
registry := NewMultiRegistry(registries)
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registry.ServiceReqsCounter().With("key", "requests").Add(1)
registry.ServiceReqDurationHistogram().With("key", "durations").Observe(float64(2))
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registry.ServiceRetriesCounter().With("key", "retries").Add(3)
for _, collectingRegistry := range registries {
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cReqsCounter := collectingRegistry.ServiceReqsCounter().(*counterMock)
cReqDurationHistogram := collectingRegistry.ServiceReqDurationHistogram().(*histogramMock)
cRetriesCounter := collectingRegistry.ServiceRetriesCounter().(*counterMock)
wantCounterValue := float64(1)
if cReqsCounter.counterValue != wantCounterValue {
t.Errorf("Got value %f for ReqsCounter, want %f", cReqsCounter.counterValue, wantCounterValue)
}
wantHistogramValue := float64(2)
if cReqDurationHistogram.lastHistogramValue != wantHistogramValue {
t.Errorf("Got last observation %f for ReqDurationHistogram, want %f", cReqDurationHistogram.lastHistogramValue, wantHistogramValue)
}
wantCounterValue = float64(3)
if cRetriesCounter.counterValue != wantCounterValue {
t.Errorf("Got value %f for RetriesCounter, want %f", cRetriesCounter.counterValue, wantCounterValue)
}
assert.Equal(t, []string{"key", "requests"}, cReqsCounter.lastLabelValues)
assert.Equal(t, []string{"key", "durations"}, cReqDurationHistogram.lastLabelValues)
assert.Equal(t, []string{"key", "retries"}, cRetriesCounter.lastLabelValues)
}
}
func newCollectingRetryMetrics() Registry {
return &standardRegistry{
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serviceReqsCounter: &counterMock{},
serviceReqDurationHistogram: &histogramMock{},
serviceRetriesCounter: &counterMock{},
}
}
type counterMock struct {
counterValue float64
lastLabelValues []string
}
func (c *counterMock) With(labelValues ...string) metrics.Counter {
c.lastLabelValues = labelValues
return c
}
func (c *counterMock) Add(delta float64) {
c.counterValue += delta
}
type histogramMock struct {
lastHistogramValue float64
lastLabelValues []string
}
func (c *histogramMock) With(labelValues ...string) ScalableHistogram {
c.lastLabelValues = labelValues
return c
}
func (c *histogramMock) Start() {}
func (c *histogramMock) ObserveFromStart(t time.Time) {}
func (c *histogramMock) Observe(v float64) {
c.lastHistogramValue = v
}