Function TestPush

prometheus/push/push_test.go:29–309

(t *testing.T)

)

func TestPush(t *testing.T) {
	var (
		lastMethod string
		lastBody   []byte
		lastPath   string
		lastHeader http.Header
	)

	// Fake a Pushgateway that responds with 202 to DELETE and with 200 in
	// all other cases.
	pgwOK := httptest.NewServer(
		http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			lastMethod = r.Method
			lastHeader = r.Header
			var err error
			lastBody, err = io.ReadAll(r.Body)
			if err != nil {
				t.Fatal(err)
			}
			lastPath = r.URL.EscapedPath()
			w.Header().Set("Content-Type", `text/plain; charset=utf-8`)
			if r.Method == http.MethodDelete {
				w.WriteHeader(http.StatusAccepted)
				return
			}
			w.WriteHeader(http.StatusOK)
		}),
	)
	defer pgwOK.Close()

	// Fake a Pushgateway that always responds with 500.
	pgwErr := httptest.NewServer(
		http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			http.Error(w, "fake error", http.StatusInternalServerError)
		}),
	)
	defer pgwErr.Close()

	metric1 := prometheus.NewCounter(prometheus.CounterOpts{
		Name: "testname1",
		Help: "testhelp1",
	})
	metric2 := prometheus.NewGauge(prometheus.GaugeOpts{
		Name:        "testname2",
		Help:        "testhelp2",
		ConstLabels: prometheus.Labels{"foo": "bar", "dings": "bums"},
	})

	reg := prometheus.NewRegistry()
	reg.MustRegister(metric1)
	reg.MustRegister(metric2)

	mfs, err := reg.Gather()
	if err != nil {
		t.Fatal(err)
	}

	buf := &bytes.Buffer{}