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720 B

package main
import (
"fmt"
"net/http"
"log"
)
var(
metrics_num_urls int
)
func main() {
log.Println("Starting HTTP listener")
http.HandleFunc("/", httpHandler)
http.HandleFunc("/metrics", metricsHandler)
listenErr := http.ListenAndServe(":80", nil) // set listen port
if listenErr != nil {
log.Fatalln(listenErr.Error())
}
}
// Handling incoming HTTP connections
func httpHandler(w http.ResponseWriter, r *http.Request) {
metrics_num_urls++
log.Printf("(%s) %s %s", r.Method, r.RemoteAddr, r.URL.Path)
}
// Handle HTTP /metrics requests
func metricsHandler(w http.ResponseWriter, req *http.Request) {
fmt.Fprintf(w, "num_urls %d\n", metrics_num_urls)
}