Function ExampleWithExtraMethods

prometheus/promhttp/option_test.go:30–71

()

)

func ExampleWithExtraMethods() {
	counter := prometheus.NewCounterVec(
		prometheus.CounterOpts{
			Name: "api_requests_total",
			Help: "A counter for requests to the wrapped handler.",
		},
		[]string{"code", "method"},
	)

	// duration is partitioned by the HTTP method and handler. It uses custom
	// buckets based on the expected request duration.
	duration := prometheus.NewHistogramVec(
		prometheus.HistogramOpts{
			Name:    "request_duration_seconds",
			Help:    "A histogram of latencies for requests.",
			Buckets: []float64{.25, .5, 1, 2.5, 5, 10},
		},
		[]string{"handler", "method"},
	)

	// Create the handlers that will be wrapped by the middleware.
	pullHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("Pull"))
	})

	// Specify additional HTTP methods to be added to the label allow list.
	opts := WithExtraMethods("CUSTOM_METHOD")

	// Instrument the handlers with all the metrics, injecting the "handler"
	// label by currying.
	pullChain := InstrumentHandlerDuration(duration.MustCurryWith(prometheus.Labels{"handler": "pull"}),
		InstrumentHandlerCounter(counter, pullHandler, opts),
		opts,
	)

	http.Handle("/metrics", Handler())
	http.Handle("/pull", pullChain)

	if err := http.ListenAndServe(":3000", nil); err != nil {
		log.Fatal(err)
	}
}

func ExampleWithLabelFromCtx() {
	counter := prometheus.NewCounterVec(