Add WebSocket server framework hooked into http.

R=r, rsc
https://golang.org/cl/156071

src/pkg/websocket/websocket_test.go

@@ -0,0 +1,61 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package websocket
+
+import (
+	"bytes";
+	"http";
+	"io";
+	"log";
+	"net";
+	"once";
+	"strings";
+	"testing";
+)
+
+var serverAddr string
+
+func echoServer(ws *Conn)	{ io.Copy(ws, ws) }
+
+func startServer() {
+	l, e := net.Listen("tcp", ":0");	// any available address
+	if e != nil {
+		log.Exitf("net.Listen tcp :0 %v", e)
+	}
+	serverAddr = l.Addr().String();
+	log.Stderr("Test WebSocket server listening on ", serverAddr);
+	http.Handle("/echo", Handler(echoServer));
+	go http.Serve(l, nil);
+}
+
+func TestEcho(t *testing.T) {
+	once.Do(startServer);
+
+	client, err := net.Dial("tcp", "", serverAddr);
+	if err != nil {
+		t.Fatal("dialing", err)
+	}
+
+	ws, err := newClient("/echo", "localhost", "http://localhost",
+		"ws://localhost/echo", "", client);
+	if err != nil {
+		t.Errorf("WebSocket handshake error", err);
+		return;
+	}
+	msg := strings.Bytes("hello, world\n");
+	if _, err := ws.Write(msg); err != nil {
+		t.Errorf("Write: error %v", err)
+	}
+	var actual_msg = make([]byte, 512);
+	n, err := ws.Read(actual_msg);
+	if err != nil {
+		t.Errorf("Read: error %v", err)
+	}
+	actual_msg = actual_msg[0:n];
+	if !bytes.Equal(msg, actual_msg) {
+		t.Errorf("Echo: expected %q got %q", msg, actual_msg)
+	}
+	ws.Close();
+}