// Copyright (c) 2009 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. #ifndef NET_WEBSOCKETS_WEBSOCKET_THROTTLE_H_ #define NET_WEBSOCKETS_WEBSOCKET_THROTTLE_H_ #include "base/hash_tables.h" #include "base/singleton.h" #include "net/socket_stream/socket_stream_throttle.h" namespace net { // SocketStreamThrottle for WebSocket protocol. // Implements the client-side requirements in the spec. // http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol // 4.1 Handshake // 1. If the user agent already has a Web Socket connection to the // remote host (IP address) identified by /host/, even if known by // another name, wait until that connection has been established or // for that connection to have failed. class WebSocketThrottle : public SocketStreamThrottle { public: virtual int OnStartOpenConnection(SocketStream* socket, CompletionCallback* callback); virtual int OnRead(SocketStream* socket, const char* data, int len, CompletionCallback* callback); virtual int OnWrite(SocketStream* socket, const char* data, int len, CompletionCallback* callback); virtual void OnClose(SocketStream* socket); static void Init(); private: class WebSocketState; typedef std::deque<WebSocketState*> ConnectingQueue; typedef base::hash_map<std::string, ConnectingQueue*> ConnectingAddressMap; WebSocketThrottle(); virtual ~WebSocketThrottle(); friend struct DefaultSingletonTraits<WebSocketThrottle>; // Puts |socket| in |queue_| and queues for the destination addresses // of |socket|. Also sets |state| as UserData of |socket|. // If other socket is using the same destination address, set |state| waiting. void PutInQueue(SocketStream* socket, WebSocketState* state); // Removes |socket| from |queue_| and queues for the destination addresses // of |socket|. Also releases |state| from UserData of |socket|. void RemoveFromQueue(SocketStream* socket, WebSocketState* state); // Checks sockets waiting in |queue_| and check the socket is the front of // every queue for the destination addresses of |socket|. // If so, the socket can resume estabilshing connection, so wake up // the socket. void WakeupSocketIfNecessary(); // Key: string of host's address. Value: queue of sockets for the address. ConnectingAddressMap addr_map_; // Queue of sockets for websockets in opening state. ConnectingQueue queue_; }; } // namespace net #endif // NET_WEBSOCKETS_WEBSOCKET_THROTTLE_H_