add chat example

-package main
-
-import (
-	"fmt"
-	"github.com/astaxie/beego"
-	"github.com/fzzy/sockjs-go/sockjs"
-	"strings"
-)
-
-var users *sockjs.SessionPool = sockjs.NewSessionPool()
-
-func chatHandler(s sockjs.Session) {
-	users.Add(s)
-	defer users.Remove(s)
-
-	for {
-		m := s.Receive()
-		if m == nil {
-			break
-		}
-		fullAddr := s.Info().RemoteAddr
-		addr := fullAddr[:strings.LastIndex(fullAddr, ":")]
-		m = []byte(fmt.Sprintf("%s: %s", addr, m))
-		users.Broadcast(m)
-	}
-}
-
-type MainController struct {
-	beego.Controller
-}
-
-func (m *MainController) Get() {
-	m.TplNames = "index.html"
-}
-
-func main() {
-	conf := sockjs.NewConfig()
-	sockjshandler := sockjs.NewHandler("/chat", chatHandler, conf)
-	beego.Router("/", &MainController{})
-	beego.RouterHandler("/chat/:info(.*)", sockjshandler)
-	beego.Run()
-}

+appname = chat
+httpport = 8080
+runmode = dev

+package controllers
+
+import (
+	"github.com/astaxie/beego"
+)
+
+type MainController struct {
+	beego.Controller
+}
+
+func (this *MainController) Get() {
+	this.Data["host"] = this.Ctx.Request.Host
+	this.TplNames = "index.tpl"
+}

+package controllers
+
+import (
+	"github.com/astaxie/beego"
+	"github.com/garyburd/go-websocket/websocket"
+	"io/ioutil"
+	"math/rand"
+	"net/http"
+	"time"
+)
+
+const (
+	// Time allowed to write a message to the client.
+	writeWait = 10 * time.Second
+
+	// Time allowed to read the next message from the client.
+	readWait = 60 * time.Second
+
+	// Send pings to client with this period. Must be less than readWait.
+	pingPeriod = (readWait * 9) / 10
+
+	// Maximum message size allowed from client.
+	maxMessageSize = 512
+)
+
+func init() {
+	rand.Seed(time.Now().UTC().UnixNano())
+	go h.run()
+}
+
+// connection is an middleman between the websocket connection and the hub.
+type connection struct {
+	username string
+
+	// The websocket connection.
+	ws *websocket.Conn
+
+	// Buffered channel of outbound messages.
+	send chan []byte
+}
+
+// readPump pumps messages from the websocket connection to the hub.
+func (c *connection) readPump() {
+	defer func() {
+		h.unregister <- c
+		c.ws.Close()
+	}()
+	c.ws.SetReadLimit(maxMessageSize)
+	c.ws.SetReadDeadline(time.Now().Add(readWait))
+	for {
+		op, r, err := c.ws.NextReader()
+		if err != nil {
+			break
+		}
+		switch op {
+		case websocket.OpPong:
+			c.ws.SetReadDeadline(time.Now().Add(readWait))
+		case websocket.OpText:
+			message, err := ioutil.ReadAll(r)
+			if err != nil {
+				break
+			}
+			h.broadcast <- []byte(c.username + "_" + time.Now().Format("15:04:05") + ":" + string(message))
+		}
+	}
+}
+
+// write writes a message with the given opCode and payload.
+func (c *connection) write(opCode int, payload []byte) error {
+	c.ws.SetWriteDeadline(time.Now().Add(writeWait))
+	return c.ws.WriteMessage(opCode, payload)
+}
+
+// writePump pumps messages from the hub to the websocket connection.
+func (c *connection) writePump() {
+	ticker := time.NewTicker(pingPeriod)
+	defer func() {
+		ticker.Stop()
+		c.ws.Close()
+	}()
+	for {
+		select {
+		case message, ok := <-c.send:
+			if !ok {
+				c.write(websocket.OpClose, []byte{})
+				return
+			}
+			if err := c.write(websocket.OpText, message); err != nil {
+				return
+			}
+		case <-ticker.C:
+			if err := c.write(websocket.OpPing, []byte{}); err != nil {
+				return
+			}
+		}
+	}
+}
+
+type hub struct {
+	// Registered connections.
+	connections map[*connection]bool
+
+	// Inbound messages from the connections.
+	broadcast chan []byte
+
+	// Register requests from the connections.
+	register chan *connection
+
+	// Unregister requests from connections.
+	unregister chan *connection
+}
+
+var h = &hub{
+	broadcast:   make(chan []byte, maxMessageSize),
+	register:    make(chan *connection, 1),
+	unregister:  make(chan *connection, 1),
+	connections: make(map[*connection]bool),
+}
+
+func (h *hub) run() {
+	for {
+		select {
+		case c := <-h.register:
+			h.connections[c] = true
+		case c := <-h.unregister:
+			delete(h.connections, c)
+			close(c.send)
+		case m := <-h.broadcast:
+			for c := range h.connections {
+				select {
+				case c.send <- m:
+				default:
+					close(c.send)
+					delete(h.connections, c)
+				}
+			}
+		}
+	}
+}
+
+type WSController struct {
+	beego.Controller
+}
+
+func (this *WSController) Get() {
+	ws, err := websocket.Upgrade(this.Ctx.ResponseWriter, this.Ctx.Request.Header, nil, 1024, 1024)
+	if _, ok := err.(websocket.HandshakeError); ok {
+		http.Error(this.Ctx.ResponseWriter, "Not a websocket handshake", 400)
+		return
+	} else if err != nil {
+		return
+	}
+	c := &connection{send: make(chan []byte, 256), ws: ws, username: randomString(10)}
+	h.register <- c
+	go c.writePump()
+	c.readPump()
+}
+
+func randomString(l int) string {
+	bytes := make([]byte, l)
+	for i := 0; i < l; i++ {
+		bytes[i] = byte(randInt(65, 90))
+	}
+	return string(bytes)
+}
+
+func randInt(min int, max int) int {
+	return min + rand.Intn(max-min)
+}

+package main
+
+import (
+	"github.com/astaxie/beego"
+	"github.com/astaxie/beego/example/chat/controllers"
+)
+
+func main() {
+	beego.Router("/", &controllers.MainController{})
+	beego.Router("/ws", &controllers.WSController{})
+	beego.Run()
+}

-<!DOCTYPE html>
-<html>
-  <head>
-	<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
-	<script src="http://cdn.sockjs.org/sockjs-0.3.4.min.js"></script>
-	<script>
-    $(function() {
-		var conn = null;
-
-		function log(msg) {
-			var control = $('#log');
-			control.html(control.html() + msg + '<br/>');
-			control.scrollTop(control.scrollTop() + 1000);
-		}
-
-		function disconnect() {
-			if (conn != null) {
-				log('Disconnecting...');
-
-				conn.close();
-				conn = null;
-
-				updateUi();
-			}
-		}
-
-		function updateUi() {
-			if (conn == null || conn.readyState != SockJS.OPEN) {
-				$('#status').text('disconnected');
-				$('#connect').text('Connect');
-			} else {
-				$('#status').text('connected (' + conn.protocol + ')');
-				$('#connect').text('Disconnect');
-			}
-		}
-
-		$('form').submit(function() {
-			var text = $('#message').val();
-			conn.send(text);
-			$('#message').val('').focus();
-			return false;
-		});
-
-		conn = new SockJS('http://' + window.location.host + '/chat');
-		log('Connecting...');
-
-		conn.onopen = function() {
-			log('Connected.');
-			updateUi();
-		};
-
-		conn.onmessage = function(e) {
-			log(e.data);
-		};
-
-		conn.onclose = function() {
-			log('Disconnected.');
-			conn = null;
-			updateUi();
-		};
-
-		$('#message').val('').focus();
-    });
-	</script>
-	<title>Sockjs-go chat</title>
-  </head>
-  <body>
-	<h1>Sockjs-go chat</h1>
-
-	<div>
-	  Status: <span id="status">disconnected</span>
-	</div>
-	<div id="log" style="width: 60em; height: 20em; overflow:auto; border: 1px solid black">
-	</div>
-	<form id="chatform">
-	  <label for="message">Message:</label>
-	  <input id="message" type="text" />
-	  <input type="submit" value="Send" />
-	</form>
-  </body>
-</html>
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+<title>Chat Example</title>
+<script src="//ajax.googleapis.com/ajax/libs/jquery/2.0.3/jquery.min.js"></script>
+<script type="text/javascript">
+    $(function() {
+
+    var conn;
+    var msg = $("#msg");
+    var log = $("#log");
+
+    function appendLog(msg) {
+        var d = log[0]
+        var doScroll = d.scrollTop == d.scrollHeight - d.clientHeight;
+        msg.appendTo(log)
+        if (doScroll) {
+            d.scrollTop = d.scrollHeight - d.clientHeight;
+        }
+    }
+
+    $("#form").submit(function() {
+        if (!conn) {
+            return false;
+        }
+        if (!msg.val()) {
+            return false;
+        }
+        conn.send(msg.val());
+        msg.val("");
+        return false
+    });
+
+    if (window["WebSocket"]) {
+        conn = new WebSocket("ws://{{.host}}/ws");
+        conn.onclose = function(evt) {
+            appendLog($("<div><b>Connection closed.</b></div>"))
+        }
+        conn.onmessage = function(evt) {
+            appendLog($("<div/>").text(evt.data))
+        }
+    } else {
+        appendLog($("<div><b>Your browser does not support WebSockets.</b></div>"))
+    }
+    });
+</script>
+<style type="text/css">
+html {
+    overflow: hidden;
+}
+
+body {
+    overflow: hidden;
+    padding: 0;
+    margin: 0;
+    width: 100%;
+    height: 100%;
+    background: gray;
+}
+
+#log {
+    background: white;
+    margin: 0;
+    padding: 0.5em 0.5em 0.5em 0.5em;
+    position: absolute;
+    top: 0.5em;
+    left: 0.5em;
+    right: 0.5em;
+    bottom: 3em;
+    overflow: auto;
+}
+
+#form {
+    padding: 0 0.5em 0 0.5em;
+    margin: 0;
+    position: absolute;
+    bottom: 1em;
+    left: 0px;
+    width: 100%;
+    overflow: hidden;
+}
+
+</style>
+</head>
+<body>
+<div id="log"></div>
+<form id="form">
+    <input type="submit" value="Send" />
+    <input type="text" id="msg" size="64"/>
+</form>
+</body>
+</html>
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