66 lines
2.0 KiB
Go
66 lines
2.0 KiB
Go
// Copyright 2022 The Prometheus Authors
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package promhttp
|
|
|
|
import (
|
|
"log"
|
|
"net/http"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
)
|
|
|
|
func ExampleInstrumentHandlerWithExtraMethods() {
|
|
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)
|
|
}
|
|
}
|