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