Simple example of counting requests and submitting to datadog, statsd, or some other logging system.

requests_per_minute.go

package main

import (
	"fmt"
	"net/http"
	"sync/atomic"
	"time"
)

var requestsPerMinute uint64

func main() {

	// Datadog example
	// c, err := statsd.New("127.0.0.1:8125")
	// if err != nil {
	// 	log.Fatal(err)
	// }
	// // prefix every metric with the app name
	// c.Namespace = "app.http.server."

	go func() {
		for {
			select {
			case <-time.After(time.Minute):
				num := atomic.SwapUint64(&requestsPerMinute, 0)
				fmt.Printf("Served %5d requests\n", num)

				// Report to datadog
				// c.Gauge("requests", float64(num), nil, 1)
			}
		}
	}()

	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		atomic.AddUint64(&requestsPerMinute, 1)
		w.Write([]byte("Hello World"))
	})

	http.ListenAndServe(":8080", nil)
}