http configurable handler to measure requests using Prometheus metrics (original) (raw)

go-prometheus-middleware

This library has been deprecated in favor of go-http-metrics, this new library has the same features as this one, plus the extensibility to new metrics formats (not only Prometheus).

The migration is simple, example:

From this:

package main

import ( "log" "net/http"

"github.com/prometheus/client_golang/prometheus/promhttp"
prommiddleware "github.com/slok/go-prometheus-middleware"

)

func main() { // Create our middleware. mdlw := prommiddleware.NewDefault()

// Our handler.
myHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    w.WriteHeader(http.StatusOK)
    w.Write([]byte("hello world!"))
})
h := mdlw.Handler("", myHandler)

// Serve metrics.
log.Printf("serving metrics at: %s", ":9090")
go http.ListenAndServe(":9090", promhttp.Handler())

// Serve our handler.
log.Printf("listening at: %s", ":8080")
if err := http.ListenAndServe(":8080", h); err != nil {
    log.Panicf("error while serving: %s", err)
}

}

To this:

package main

import ( "log" "net/http"

"github.com/prometheus/client_golang/prometheus/promhttp"
metrics "github.com/slok/go-http-metrics/metrics/prometheus"
"github.com/slok/go-http-metrics/middleware"

)

func main() { // Create our middleware. mdlw := middleware.New(middleware.Config{ Recorder: metrics.New(metrics.Config{}), })

// Our handler.
myHandler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    w.WriteHeader(http.StatusOK)
    w.Write([]byte("hello world!"))
})
h := mdlw.Handler("", myHandler)

// Serve metrics.
log.Printf("serving metrics at: %s", ":9090")
go http.ListenAndServe(":9090", promhttp.Handler())

// Serve our handler.
log.Printf("listening at: %s", ":8080")
if err := http.ListenAndServe(":8080", h); err != nil {
    log.Panicf("error while serving: %s", err)
}

}