Log once a day how many connections had client_ip.

		log.Fatalf("error in setup: %s", err)

	}

	go statsThread()

	var certManager *autocert.Manager

	if !disableTLS {

		log.Printf("ACME hostnames: %q", acmeHostnames)

package main

// This code handled periodic statistics logging.

//

// The only thing it keeps track of is how many connections had the client_ip

// parameter. Write true to statsChannel to record a connection with client_ip;

// write false for without.

import (

	"log"

	"time"

)

const (

	statsInterval = 24 * time.Hour

)

var (

	statsChannel = make(chan bool)

)

func statsThread() {

	var numClientIP, numConnections uint64

	prevTime := time.Now()

	for {

		select {

		case v := <-statsChannel:

			if v {

				numClientIP += 1

			}

			numConnections += 1

		case <-time.After(statsInterval):

			now := time.Now()

			log.Printf("in the past %.g s, %d/%d connections had client_ip",

				(now.Sub(prevTime)).Seconds(),

				numClientIP, numConnections)

			numClientIP = 0

			numConnections = 0

			prevTime = now

		}

	}

}