go-server-channels-wrap.go

package main 
 
import (
    "fmt"
    "log"
    "flag"
 
    "net/http"
)
 
var (
    port int
)

func visitServer(visitChan chan bool) {
    var visits int

    for {
        if <-visitChan {
            visits++

            log.Printf("%v visits", visits)
        }
    }
}
 
func rootHandler(visitChan chan bool, w http.ResponseWriter, r *http.Request) {
    visitChan <-true

    fmt.Fprint(w, "Hello, World!")
}
 
func init() {
    flag.IntVar(&port, "port", 8080, "HTTP Server Port")
    flag.Parse()
}
 
func main() {
    var visitChan = make(chan bool)

    go visitServer(visitChan)

    httpAddr := fmt.Sprintf(":%v", port)
 
    log.Printf("Listening to %v", httpAddr)
 
    http.HandleFunc("/", func (w http.ResponseWriter, r *http.Request) {
        rootHandler(visitChan, w, r)
    })
    log.Fatal(http.ListenAndServe(httpAddr, nil))
}