andrewytliu/home.html

## home.html
<html>
    <head>
        <title>HashGreen</title>
        <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
        <script type="text/javascript">
            $(function() {
                var conn, msg = $("#msg"), log = $("#log");

                $("#form").submit(function() {
                    if (!conn) return false;
                    if (!msg.val()) return false;
                    conn.send(msg.val());
                    msg.val("");
                    return false;
                });

                conn = new WebSocket("ws://{{$}}/ws");
                conn.onclose = function(e) {
                    log.append($("<div><b>Connection closed.</b></div>"));
                }
                conn.onmessage = function(e) {
                    log.append($("<div/>").text(e.data));
                }
            });
        </script>
        <style type="text/css">
            html {
                overflow: hidden;
            }
            body {
                overflow: hidden;
                padding: 0;
                margin: 0;
                width: 100%;
                height: 100%;
                background: #252525;
                font-family: 'Lato', sans-serif;
            }
            #log {
                border-radius: 20px;
                background: #FFF;
                margin: 5em;
                padding: 0.5em;
                overflow: auto;
            }
            #form {
                padding: 5px;
                margin-left: 5em;
                margin-right: 5em;
                overflow: hidden;
            }
        </style>
    </head>
    <body>
        <div id="log"></div>
        <form id="form">
            <input type="text" id="msg" size="50" />
            <input type="submit" value="Send!" />
        </form>
    </body>
</html>

## main.go
package main

import (
        "code.google.com/p/go.net/websocket"
        "log"
        "net/http"
        "text/template"
)

type Connection struct {
        ws   *websocket.Conn
        send chan string
}

func (c *Connection) ReadLoop() {
        for {
                var m string
                err := websocket.Message.Receive(c.ws, &m)
                if err != nil {
                        log.Println("Read conn:", err)
                        break
                }
                pool.broadcast <- m
        }
        c.ws.Close()
}

func (c *Connection) WriteLoop() {
        for m := range c.send {
                err := websocket.Message.Send(c.ws, m)
                if err != nil {
                        log.Println("Write conn:", err)
                        break
                }
        }
        c.ws.Close()
}

func NewConnection(ws *websocket.Conn) {
        c := &Connection{send: make(chan string, 256), ws: ws}
        pool.connect <- c
        defer func() { pool.disconnect <- c }()
        go c.WriteLoop()
        c.ReadLoop()
}

type Pool struct {
        connections map[*Connection]bool
        broadcast   chan string
        connect     chan *Connection
        disconnect  chan *Connection
}

func (p *Pool) Run() {
        for {
                select {
                case c := <-p.connect:
                        p.connections[c] = true
                        log.Println("New connection in:", c.ws.LocalAddr())
                case c := <-p.disconnect:
                        delete(p.connections, c)
                        log.Println("Disconnected:", c.ws.LocalAddr())
                case m := <-p.broadcast:
                        log.Println("Broadcasting:", m)
                        for c := range p.connections {
                                select {
                                case c.send <- m:
                                default:
                                        delete(p.connections, c)
                                        close(c.send)
                                        go c.ws.Close()
                                }
                        }
                }
        }
}

var pool = Pool{
        connections: make(map[*Connection]bool),
        broadcast:   make(chan string),
        connect:     make(chan *Connection),
        disconnect:  make(chan *Connection),
}
var tmpl = template.Must(template.ParseFiles("home.html"))

func main() {
        go pool.Run()
        http.HandleFunc("/", func(res http.ResponseWriter, req *http.Request) {
                tmpl.Execute(res, req.Host)
        })
        http.Handle("/ws", websocket.Handler(NewConnection))

        log.Println("Starting the server...")
        if err := http.ListenAndServe(":3000", nil); err != nil {
                log.Fatal("Serve: ", err)
        }
        log.Println("Server started")
}
	<html>
	<head>
	<title>HashGreen</title>
	<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
	<script type="text/javascript">
	$(function() {
	var conn, msg = $("#msg"), log = $("#log");

	$("#form").submit(function() {
	if (!conn) return false;
	if (!msg.val()) return false;
	conn.send(msg.val());
	msg.val("");
	return false;
	});

	conn = new WebSocket("ws://{{$}}/ws");
	conn.onclose = function(e) {
	log.append($("<div><b>Connection closed.</b></div>"));
	}
	conn.onmessage = function(e) {
	log.append($("<div/>").text(e.data));
	}
	});
	</script>
	<style type="text/css">
	html {
	overflow: hidden;
	}
	body {
	overflow: hidden;
	padding: 0;
	margin: 0;
	width: 100%;
	height: 100%;
	background: #252525;
	font-family: 'Lato', sans-serif;
	}
	#log {
	border-radius: 20px;
	background: #FFF;
	margin: 5em;
	padding: 0.5em;
	overflow: auto;
	}
	#form {
	padding: 5px;
	margin-left: 5em;
	margin-right: 5em;
	overflow: hidden;
	}
	</style>
	</head>
	<body>
	<div id="log"></div>
	<form id="form">
	<input type="text" id="msg" size="50" />
	<input type="submit" value="Send!" />
	</form>
	</body>
	</html>
	package main

	import (
	"code.google.com/p/go.net/websocket"
	"log"
	"net/http"
	"text/template"
	)

	type Connection struct {
	ws *websocket.Conn
	send chan string
	}

	func (c *Connection) ReadLoop() {
	for {
	var m string
	err := websocket.Message.Receive(c.ws, &m)
	if err != nil {
	log.Println("Read conn:", err)
	break
	}
	pool.broadcast <- m
	}
	c.ws.Close()
	}

	func (c *Connection) WriteLoop() {
	for m := range c.send {
	err := websocket.Message.Send(c.ws, m)
	if err != nil {
	log.Println("Write conn:", err)
	break
	}
	}
	c.ws.Close()
	}

	func NewConnection(ws *websocket.Conn) {
	c := &Connection{send: make(chan string, 256), ws: ws}
	pool.connect <- c
	defer func() { pool.disconnect <- c }()
	go c.WriteLoop()
	c.ReadLoop()
	}

	type Pool struct {
	connections map[*Connection]bool
	broadcast chan string
	connect chan *Connection
	disconnect chan *Connection
	}

	func (p *Pool) Run() {
	for {
	select {
	case c := <-p.connect:
	p.connections[c] = true
	log.Println("New connection in:", c.ws.LocalAddr())
	case c := <-p.disconnect:
	delete(p.connections, c)
	log.Println("Disconnected:", c.ws.LocalAddr())
	case m := <-p.broadcast:
	log.Println("Broadcasting:", m)
	for c := range p.connections {
	select {
	case c.send <- m:
	default:
	delete(p.connections, c)
	close(c.send)
	go c.ws.Close()
	}
	}
	}
	}
	}

	var pool = Pool{
	connections: make(map[*Connection]bool),
	broadcast: make(chan string),
	connect: make(chan *Connection),
	disconnect: make(chan *Connection),
	}
	var tmpl = template.Must(template.ParseFiles("home.html"))

	func main() {
	go pool.Run()
	http.HandleFunc("/", func(res http.ResponseWriter, req *http.Request) {
	tmpl.Execute(res, req.Host)
	})
	http.Handle("/ws", websocket.Handler(NewConnection))

	log.Println("Starting the server...")
	if err := http.ListenAndServe(":3000", nil); err != nil {
	log.Fatal("Serve: ", err)
	}
	log.Println("Server started")
	}