131 lines
3.4 KiB
Go
131 lines
3.4 KiB
Go
package middlewares
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import (
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"fmt"
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"net/http"
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"net/http/httptest"
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"strings"
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"testing"
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"github.com/codegangsta/negroni"
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"github.com/containous/traefik/types"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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dto "github.com/prometheus/client_model/go"
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"github.com/stretchr/testify/assert"
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)
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func TestPrometheus(t *testing.T) {
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metricsFamily, err := prometheus.DefaultGatherer.Gather()
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if err != nil {
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t.Fatalf("could not gather metrics family: %s", err)
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}
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initialMetricsFamilyCount := len(metricsFamily)
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recorder := httptest.NewRecorder()
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n := negroni.New()
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metricsMiddlewareBackend := NewMetricsWrapper(NewPrometheus("test", &types.Prometheus{}))
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n.Use(metricsMiddlewareBackend)
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r := http.NewServeMux()
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r.Handle("/metrics", promhttp.Handler())
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r.HandleFunc(`/ok`, func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(http.StatusOK)
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fmt.Fprintln(w, "ok")
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})
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n.UseHandler(r)
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req1, err := http.NewRequest("GET", "http://localhost:3000/ok", nil)
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if err != nil {
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t.Error(err)
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}
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req2, err := http.NewRequest("GET", "http://localhost:3000/metrics", nil)
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if err != nil {
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t.Error(err)
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}
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n.ServeHTTP(recorder, req1)
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n.ServeHTTP(recorder, req2)
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body := recorder.Body.String()
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if !strings.Contains(body, reqsName) {
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t.Errorf("body does not contain request total entry '%s'", reqsName)
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}
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if !strings.Contains(body, latencyName) {
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t.Errorf("body does not contain request duration entry '%s'", latencyName)
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}
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// Register the same metrics again
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metricsMiddlewareBackend = NewMetricsWrapper(NewPrometheus("test", &types.Prometheus{}))
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n = negroni.New()
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n.Use(metricsMiddlewareBackend)
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n.UseHandler(r)
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n.ServeHTTP(recorder, req2)
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metricsFamily, err = prometheus.DefaultGatherer.Gather()
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if err != nil {
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t.Fatalf("could not gather metrics family: %s", err)
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}
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tests := []struct {
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name string
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labels map[string]string
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assert func(*dto.MetricFamily)
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}{
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{
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name: reqsName,
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labels: map[string]string{
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"code": "200",
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"method": "GET",
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"service": "test",
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},
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assert: func(family *dto.MetricFamily) {
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cv := uint(family.Metric[0].Counter.GetValue())
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if cv != 3 {
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t.Errorf("gathered metrics do not contain correct value for total requests, got %d", cv)
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}
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},
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},
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{
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name: latencyName,
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labels: map[string]string{
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"service": "test",
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},
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assert: func(family *dto.MetricFamily) {
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sc := family.Metric[0].Histogram.GetSampleCount()
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if sc != 3 {
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t.Errorf("gathered metrics do not contain correct sample count for request duration, got %d", sc)
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}
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},
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},
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}
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assert.Equal(t, len(tests), len(metricsFamily)-initialMetricsFamilyCount, "gathered traefic metrics count does not match tests count")
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for _, test := range tests {
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family := findMetricFamily(test.name, metricsFamily)
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if family == nil {
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t.Errorf("gathered metrics do not contain '%s'", test.name)
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continue
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}
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for _, label := range family.Metric[0].Label {
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val, ok := test.labels[*label.Name]
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if !ok {
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t.Errorf("'%s' metric contains unexpected label '%s'", test.name, label)
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} else if val != *label.Value {
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t.Errorf("label '%s' in metric '%s' has wrong value '%s'", label, test.name, *label.Value)
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}
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}
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test.assert(family)
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}
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}
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func findMetricFamily(name string, families []*dto.MetricFamily) *dto.MetricFamily {
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for _, family := range families {
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if family.GetName() == name {
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return family
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}
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}
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return nil
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}
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