golang はシンプルなウェブソケット・チャットルーム機能を実装しています。

package main
 
import (
	"encoding/json"
	"fmt"
	"golang.org/x/net/websocket"
	"log"
	"net/http"
)
 
//ProxyConfig configuration
type MsgConfig struct {
	Type string `json:"type,omitempty"`
	Uid string `json:"uid,omitempty"`
	Msg string `json:"msg,omitempty"`
}
 
var connMap = make(map[string]*websocket.Conn)
 
func Echo(ws *websocket.Conn) {
	var err error
	for {
		var reply string
 
		Receive(ws, &reply); if err = websocket. = nil {
			fmt.Println("Can't receive")
			break
		}
		replyMsg := MsgConfig{}
		json.Unmarshal([]byte(reply), &replyMsg)
 
		if replyMsg.Type == "login" && replyMsg.Uid ! = "" {
			connMap[replyMsg.Uid] = ws
			fmt.Println(connMap)
		}
		for k, v := range connMap {
			go sendMessage(replyMsg, v, k)
		}
 
	}
}
 
func sendMessage(replyMsg MsgConfig, conn *websocket.Conn, connUid string) {
	msg := replyMsg.Uid + "say:" + replyMsg.Msg
	if connUid == replyMsg.Uid {
		fmt.Println(msg)
		if replyMsg.Type == "login" {
			msg = "Login successful"
		} else {
			msg = "You said:" + replyMsg.Msg
		}
 
	}
	if err := websocket.Message.Send(conn, msg); err ! = nil {
		fmt.Println("Can't send")
	}
 
}
func main() {
 
	http.Handle("/", websocket.Handler(Echo))
 
	if err := http.ListenAndServe(":1234", nil); err ! = nil {
		log.Fatal("ListenAndServe:", err)
	}
}

ws = new WebSocket("ws://127.0.0.1:1234");
ws.onopen = function (ev) {
        ws.send('{"type":"login","uid":"I'm username","msg":"I'm logged in"}');
    };
ws.onmessage = function (ev) {
        if (ev.data){
            console.log(ev.data)
        }
};

// The following sentence can be sent multiple times, as a chat.
ws.send('{"type":"msg","uid":"I'm username","msg":"Hello"}');