traefik/middlewares/prometheus_test.go

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