Add simple WebSocket server implementation.

remoting/host/websocket_listener.cc

+// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "remoting/host/websocket_listener.h"
+
+#include <vector>
+
+#include "base/compiler_specific.h"
+#include "base/location.h"
+#include "base/single_thread_task_runner.h"
+#include "base/stl_util.h"
+#include "base/sys_byteorder.h"
+#include "base/thread_task_runner_handle.h"
+#include "net/base/net_errors.h"
+#include "net/socket/stream_socket.h"
+#include "remoting/host/websocket_connection.h"
+
+namespace remoting {
+
+namespace {
+const int kTcpListenBacklog = 2;

[Wez, 2012/11/15 02:28:37]

nit: The conventional value for this is 5.  Does net/ really not define a
default?

[Sergey Ulanov, 2012/11/15 21:01:03]

Done.

+}  // namespace
+
+WebsocketListener::WebsocketListener()
+    : tcp_socket_(new net::TCPServerSocket(NULL, net::NetLog::Source())),
+      ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
+}
+
+WebsocketListener::~WebsocketListener() {
+  STLDeleteElements(&pending_connections_);
+}
+
+bool WebsocketListener::Listen(const net::IPEndPoint& address,
+                               const NewConnectionCallback& callback) {
+  new_connection_callback_ = callback;

[Wez, 2012/11/15 02:28:37]

nit: Blank line after this.

[Sergey Ulanov, 2012/11/15 21:01:03]

Done.

+  int result = tcp_socket_->Listen(address, kTcpListenBacklog);
+  if (result != net::OK) {
+    return false;
+  }
+
+  DoAccept();
+  return true;
+}
+
+void WebsocketListener::DoAccept() {
+  while (true) {
+    int result = tcp_socket_->Accept(
+        &accepted_socket_, base::Bind(&WebsocketListener::OnAccepted,
+                                      base::Unretained(this)));
+    if (result != net::ERR_IO_PENDING) {
+      HandleAcceptResult(result);
+    }
+    if (result != net::OK) {
+      break;
+    }
+  }
+}
+
+void WebsocketListener::OnAccepted(int result) {
+  DCHECK_NE(result, net::ERR_IO_PENDING);
+  if (result == net::OK) {
+    // The call for WebsocketConnection::Start() may result in delegate being
+    // called which is allowed to destroyed this object, so we need to post a
+    // task to call DoAccept() again asynchronously.
+    base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE, base::Bind(&WebsocketListener::DoAccept,
+                            weak_factory_.GetWeakPtr()));
+  }
+  HandleAcceptResult(result);
+}
+
+void WebsocketListener::HandleAcceptResult(int result) {
+  if (result == net::OK) {
+    WebsocketConnection* connection = new WebsocketConnection();
+    pending_connections_.insert(connection);
+    connection->Start(
+        accepted_socket_.Pass(),
+        base::Bind(&WebsocketListener::OnConnected, weak_factory_.GetWeakPtr(),
+                   connection));
+  } else {
+    LOG(ERROR) << "Error when trying to accept WebSocket connection: "
+               << result;
+  }
+}
+
+void WebsocketListener::OnConnected(WebsocketConnection* connection_ptr,
+                                    bool handshake_result) {
+  scoped_ptr<WebsocketConnection> connection(connection_ptr);
+  pending_connections_.erase(connection_ptr);
+  if (handshake_result) {
+    new_connection_callback_.Run(connection.Pass());
+  }
+}
+
+}  // namespace remoting