2016-01-15 18:48:03 +00:00
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// Copyright 2015 The Gorilla WebSocket Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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package main
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import (
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"flag"
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"html/template"
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"log"
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"net/http"
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2016-03-01 00:51:26 +00:00
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"github.com/gorilla/websocket"
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2016-01-15 18:48:03 +00:00
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)
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var addr = flag.String("addr", "localhost:8080", "http service address")
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var upgrader = websocket.Upgrader{} // use default options
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func echo(w http.ResponseWriter, r *http.Request) {
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c, err := upgrader.Upgrade(w, r, nil)
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if err != nil {
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log.Print("upgrade:", err)
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return
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}
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defer c.Close()
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for {
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mt, message, err := c.ReadMessage()
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if err != nil {
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log.Println("read:", err)
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break
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}
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log.Printf("recv: %s", message)
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err = c.WriteMessage(mt, message)
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if err != nil {
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log.Println("write:", err)
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break
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}
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}
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}
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func home(w http.ResponseWriter, r *http.Request) {
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homeTemplate.Execute(w, "ws://"+r.Host+"/echo")
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}
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func main() {
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flag.Parse()
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log.SetFlags(0)
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http.HandleFunc("/echo", echo)
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http.HandleFunc("/", home)
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log.Fatal(http.ListenAndServe(*addr, nil))
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}
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var homeTemplate = template.Must(template.New("").Parse(`
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<!DOCTYPE html>
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<head>
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<meta charset="utf-8">
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<script>
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window.addEventListener("load", function(evt) {
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var output = document.getElementById("output");
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var input = document.getElementById("input");
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var ws;
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var print = function(message) {
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var d = document.createElement("div");
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d.innerHTML = message;
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output.appendChild(d);
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};
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document.getElementById("open").onclick = function(evt) {
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if (ws) {
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return false;
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}
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ws = new WebSocket("{{.}}");
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ws.onopen = function(evt) {
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print("OPEN");
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}
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ws.onclose = function(evt) {
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print("CLOSE");
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ws = null;
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}
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ws.onmessage = function(evt) {
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print("RESPONSE: " + evt.data);
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}
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ws.onerror = function(evt) {
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print("ERROR: " + evt.data);
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}
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return false;
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};
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document.getElementById("send").onclick = function(evt) {
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if (!ws) {
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return false;
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}
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print("SEND: " + input.value);
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ws.send(input.value);
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return false;
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};
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document.getElementById("close").onclick = function(evt) {
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if (!ws) {
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return false;
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}
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ws.close();
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return false;
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};
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});
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</script>
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</head>
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<body>
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<table>
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<tr><td valign="top" width="50%">
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<p>Click "Open" to create a connection to the server,
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"Send" to send a message to the server and "Close" to close the connection.
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You can change the message and send multiple times.
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<p>
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<form>
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<button id="open">Open</button>
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<button id="close">Close</button>
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<p><input id="input" type="text" value="Hello world!">
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<button id="send">Send</button>
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</form>
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</td><td valign="top" width="50%">
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<div id="output"></div>
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</td></tr></table>
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</body>
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</html>
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`))
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