traefik/metrics/prometheus_test.go

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package metrics
import (
"net/http"
"strconv"
"testing"
"github.com/containous/traefik/types"
"github.com/prometheus/client_golang/prometheus"
dto "github.com/prometheus/client_model/go"
)
func TestPrometheus(t *testing.T) {
prometheusRegistry := RegisterPrometheus(&types.Prometheus{})
if !prometheusRegistry.IsEnabled() {
t.Errorf("PrometheusRegistry should return true for IsEnabled()")
}
prometheusRegistry.ReqsCounter().With("service", "test", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet).Add(1)
prometheusRegistry.ReqsCounter().With("service", "test", "code", strconv.Itoa(http.StatusOK), "method", http.MethodGet).Add(1)
prometheusRegistry.ReqDurationHistogram().With("service", "test", "code", strconv.Itoa(http.StatusOK)).Observe(10000)
prometheusRegistry.ReqDurationHistogram().With("service", "test", "code", strconv.Itoa(http.StatusOK)).Observe(10000)
prometheusRegistry.RetriesCounter().With("service", "test").Add(1)
metricsFamilies, err := prometheus.DefaultGatherer.Gather()
if err != nil {
t.Fatalf("could not gather metrics families: %s", err)
}
tests := []struct {
name string
labels map[string]string
assert func(*dto.MetricFamily)
}{
{
name: reqsTotalName,
labels: map[string]string{
"code": "200",
"method": http.MethodGet,
"service": "test",
},
assert: func(family *dto.MetricFamily) {
cv := family.Metric[0].Counter.GetValue()
expectedCv := float64(2)
if cv != expectedCv {
t.Errorf("gathered metrics do not contain correct value for total requests, got %f expected %f", cv, expectedCv)
}
},
},
{
name: reqDurationName,
labels: map[string]string{
"service": "test",
"code": "200",
},
assert: func(family *dto.MetricFamily) {
sc := family.Metric[0].Histogram.GetSampleCount()
expectedSc := uint64(2)
if sc != expectedSc {
t.Errorf("gathered metrics do not contain correct sample count for request duration, got %d expected %d", sc, expectedSc)
}
},
},
{
name: retriesTotalName,
labels: map[string]string{
"service": "test",
},
assert: func(family *dto.MetricFamily) {
cv := family.Metric[0].Counter.GetValue()
expectedCv := float64(1)
if cv != expectedCv {
t.Errorf("gathered metrics do not contain correct value for total retries, got %f expected %f", cv, expectedCv)
}
},
},
}
for _, test := range tests {
family := findMetricFamily(test.name, metricsFamilies)
if family == nil {
t.Errorf("gathered metrics do not contain %q", test.name)
continue
}
for _, label := range family.Metric[0].Label {
val, ok := test.labels[*label.Name]
if !ok {
t.Errorf("%q metric contains unexpected label %q", test.name, *label.Name)
} else if val != *label.Value {
t.Errorf("label %q in metric %q has wrong value %q, expected %q", *label.Name, test.name, *label.Value, val)
}
}
test.assert(family)
}
}
func findMetricFamily(name string, families []*dto.MetricFamily) *dto.MetricFamily {
for _, family := range families {
if family.GetName() == name {
return family
}
}
return nil
}