asedraw/main.go

package main

import (
	"flag"
	"github.com/gorilla/websocket"
	"log"
	"net/http"
)

var addr = flag.String("addr", "localhost:8797", "http service address")

var upgrader = websocket.Upgrader{} // use default options

func echo(w http.ResponseWriter, r *http.Request) {
	c, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Print("upgrade:", err)
		return
	}
	defer func(c *websocket.Conn) {
		err := c.Close()
		if err != nil {
			log.Println("close:	", err)
			return
		}
	}(c)
	for {
		mt, message, err := c.ReadMessage()
		log.Printf("recv: %s", message)
		err = c.WriteMessage(mt, message)
		if err != nil {
			log.Println(err)
			return
		}
	}
}

func main() {
	flag.Parse()
	log.SetFlags(0)
	http.HandleFunc("/", echo)
	log.Fatal(http.ListenAndServe(*addr, nil))
}