Created
February 8, 2012 17:02
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Go WebSocket Example
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| package main | |
| import ( | |
| "websocket" | |
| ) | |
| type connection struct { | |
| // The websocket connection. | |
| ws *websocket.Conn | |
| // Buffered channel of outbound messages. | |
| send chan string | |
| } | |
| func (c *connection) reader() { | |
| for { | |
| var message string | |
| err := websocket.Message.Receive(c.ws, &message) | |
| if err != nil { | |
| break | |
| } | |
| h.broadcast <- message | |
| } | |
| c.ws.Close() | |
| } | |
| func (c *connection) writer() { | |
| for message := range c.send { | |
| err := websocket.Message.Send(c.ws, message) | |
| if err != nil { | |
| break | |
| } | |
| } | |
| c.ws.Close() | |
| } | |
| func wsHandler(ws *websocket.Conn) { | |
| c := &connection{send: make(chan string, 256), ws: ws} | |
| h.register <- c | |
| defer func() { h.unregister <- c }() | |
| go c.writer() | |
| c.reader() | |
| } |
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| <html> | |
| <head> | |
| <title>Chat Example</title> | |
| <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/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; | |
| } | |
| } | |
| $("#form").submit(function() { | |
| if (!conn) { | |
| return false; | |
| } | |
| if (!msg.val()) { | |
| return false; | |
| } | |
| conn.send(msg.val()); | |
| msg.val(""); | |
| return false | |
| }); | |
| if (window["WebSocket"]) { | |
| conn = new WebSocket("ws://{{$}}/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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| package main | |
| type hub struct { | |
| // Registered connections. | |
| connections map[*connection]bool | |
| // Inbound messages from the connections. | |
| broadcast chan string | |
| // Register requests from the connections. | |
| register chan *connection | |
| // Unregister requests from connections. | |
| unregister chan *connection | |
| } | |
| var h = hub{ | |
| broadcast: make(chan string), | |
| register: make(chan *connection), | |
| unregister: make(chan *connection), | |
| 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: | |
| delete(h.connections, c) | |
| close(c.send) | |
| go c.ws.Close() | |
| } | |
| } | |
| } | |
| } | |
| } |
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| package main | |
| import ( | |
| "flag" | |
| "log" | |
| "net/http" | |
| "text/template" | |
| "websocket" | |
| ) | |
| var addr = flag.String("addr", ":8080", "http service address") | |
| var homeTempl = template.Must(template.ParseFiles("home.html")) | |
| func homeHandler(c http.ResponseWriter, req *http.Request) { | |
| homeTempl.Execute(c, req.Host) | |
| } | |
| func main() { | |
| flag.Parse() | |
| go h.run() | |
| http.HandleFunc("/", homeHandler) | |
| http.Handle("/ws", websocket.Handler(wsHandler)) | |
| if err := http.ListenAndServe(*addr, nil); err != nil { | |
| log.Fatal("ListenAndServe:", err) | |
| } | |
| } |
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| run: clean example | |
| ./example | |
| include $(GOROOT)/src/Make.inc | |
| TARG=example | |
| GOFILES=\ | |
| main.go\ | |
| hub.go\ | |
| conn.go | |
| include $(GOROOT)/src/Make.cmd |
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