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main.go
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main.go
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package main
import (
"code.google.com/p/go.net/websocket"
"log"
"net/http"
"os"
"strings"
"time"
)
func main() {
log.SetPrefix("go-ws-test: ")
http.HandleFunc("/", Home)
http.Handle("/echo", websocket.Handler(Echo))
err := http.ListenAndServe(":"+os.Getenv("PORT"), nil)
if err != nil {
log.Fatalln(err)
}
}
func Echo(ws *websocket.Conn) {
defer ws.Close()
buf := make([]byte, 64*1024)
for {
n, err := ws.Read(buf)
if err != nil {
return
}
_, err = ws.Write(buf[:n])
if err != nil {
return
}
}
}
func Home(w http.ResponseWriter, r *http.Request) {
body := strings.NewReader(home)
http.ServeContent(w, r, "index.html", time.Time{}, body)
}
// From http://www.websocket.org/echo.html
const home = `
<!DOCTYPE html>
<meta charset="utf-8" />
<title>WebSocket Test</title>
<script language="javascript" type="text/javascript">
var wsUri = "ws://" + document.location.host + "/echo";
var output, msg;
function init() {
output = document.getElementById("output");
msg = document.getElementById("msg");
document.getElementById("theform").addEventListener("submit", sendmsg);
testWebSocket();
}
function testWebSocket() {
websocket = new WebSocket(wsUri);
websocket.onopen = function(evt) {
onOpen(evt)
};
websocket.onclose = function(evt) {
onClose(evt)
};
websocket.onmessage = function(evt) {
onMessage(evt)
};
websocket.onerror = function(evt) {
onError(evt)
};
}
function onOpen(evt) {
writeToScreen("CONNECTED", "black");
doSend("WebSocket rocks");
}
function onClose(evt) {
writeToScreen("DISCONNECTED", "black");
}
function onMessage(evt) {
writeToScreen("RESPONSE: " + evt.data, "blue");
}
function onError(evt) {
writeToScreen("ERROR: " + evt.data, "red");
}
function doSend(message) {
writeToScreen("SENT: " + message, "black");
websocket.send(message);
}
function sendmsg(ev) {
ev.preventDefault();
doSend(msg.value);
}
function writeToScreen(message, color) {
var p = document.createElement("p");
p.style.wordWrap = "break-word";
p.style.color = color;
p.textContent = message;
output.appendChild(p);
}
</script>
<h2>WebSocket Test</h2>
<form id=theform>
<input id=msg placeholder="Type a message">
<input type=submit>
</form>
<div id=output></div>
<script>
window.addEventListener("load", init);
</script>
</html>
`