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simple websocket example with golang
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| <html> | |
| <head> | |
| <title>WebSocket demo</title> | |
| </head> | |
| <body> | |
| <div> | |
| <form> | |
| <label for="numberfield">Number</label> | |
| <input type="text" id="numberfield" placeholder="12"/><br /> | |
| <button type="button" id="sendBtn">Send</button> | |
| </form> | |
| </div> | |
| <div id="container"></div> | |
| <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script> | |
| <script type="text/javascript"> | |
| $(function () { | |
| var ws; | |
| if (window.WebSocket === undefined) { | |
| $("#container").append("Your browser does not support WebSockets"); | |
| return; | |
| } else { | |
| ws = initWS(); | |
| } | |
| function initWS() { | |
| var socket = new WebSocket("ws://localhost:8080/ws"), | |
| container = $("#container") | |
| socket.onopen = function() { | |
| container.append("<p>Socket is open</p>"); | |
| }; | |
| socket.onmessage = function (e) { | |
| container.append("<p> Got some shit:" + e.data + "</p>"); | |
| } | |
| socket.onclose = function () { | |
| container.append("<p>Socket closed</p>"); | |
| } | |
| return socket; | |
| } | |
| $("#sendBtn").click(function (e) { | |
| e.preventDefault(); | |
| ws.send(JSON.stringify({ Num: parseInt($("#numberfield").val()) })); | |
| }); | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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| package main | |
| import ( | |
| "fmt" | |
| "github.com/gorilla/websocket" | |
| "io/ioutil" | |
| "net/http" | |
| ) | |
| type msg struct { | |
| Num int | |
| } | |
| func main() { | |
| http.HandleFunc("/ws", wsHandler) | |
| http.HandleFunc("/", rootHandler) | |
| panic(http.ListenAndServe(":8080", nil)) | |
| } | |
| func rootHandler(w http.ResponseWriter, r *http.Request) { | |
| content, err := ioutil.ReadFile("index.html") | |
| if err != nil { | |
| fmt.Println("Could not open file.", err) | |
| } | |
| fmt.Fprintf(w, "%s", content) | |
| } | |
| func wsHandler(w http.ResponseWriter, r *http.Request) { | |
| if r.Header.Get("Origin") != "http://"+r.Host { | |
| http.Error(w, "Origin not allowed", 403) | |
| return | |
| } | |
| conn, err := websocket.Upgrade(w, r, w.Header(), 1024, 1024) | |
| if err != nil { | |
| http.Error(w, "Could not open websocket connection", http.StatusBadRequest) | |
| } | |
| go echo(conn) | |
| } | |
| func echo(conn *websocket.Conn) { | |
| for { | |
| m := msg{} | |
| err := conn.ReadJSON(&m) | |
| if err != nil { | |
| fmt.Println("Error reading json.", err) | |
| } | |
| fmt.Printf("Got message: %#v\n", m) | |
| if err = conn.WriteJSON(m); err != nil { | |
| fmt.Println(err) | |
| } | |
| } | |
| } |
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