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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef NET_BASE_TCP_CLIENT_SOCKET_H_
#define NET_BASE_TCP_CLIENT_SOCKET_H_
#include <ws2tcpip.h>
#include "base/object_watcher.h"
#include "net/base/address_list.h"
#include "net/base/client_socket.h"
namespace net {
// A client socket that uses TCP as the transport layer.
//
// NOTE: The implementation supports half duplex only. Read and Write calls
// must not be in progress at the same time.
class TCPClientSocket : public ClientSocket,
public base::ObjectWatcher::Delegate {
public:
// The IP address(es) and port number to connect to. The TCP socket will try
// each IP address in the list until it succeeds in establishing a
// connection.
explicit TCPClientSocket(const AddressList& addresses);
~TCPClientSocket();
// ClientSocket methods:
virtual int Connect(CompletionCallback* callback);
virtual int ReconnectIgnoringLastError(CompletionCallback* callback);
virtual void Disconnect();
virtual bool IsConnected() const;
// Socket methods:
virtual int Read(char* buf, int buf_len, CompletionCallback* callback);
virtual int Write(const char* buf, int buf_len, CompletionCallback* callback);
private:
int CreateSocket(const struct addrinfo* ai);
void DoCallback(int rv);
void DidCompleteConnect();
void DidCompleteIO();
// MessageLoop::Watcher methods:
virtual void OnObjectSignaled(HANDLE object);
SOCKET socket_;
OVERLAPPED overlapped_;
WSABUF buffer_;
base::ObjectWatcher watcher_;
CompletionCallback* callback_;
// The list of addresses we should try in order to establish a connection.
AddressList addresses_;
// The addrinfo that we are attempting to use or NULL if all addrinfos have
// been tried.
const struct addrinfo* current_ai_;
enum WaitState {
NOT_WAITING,
WAITING_CONNECT,
WAITING_READ,
WAITING_WRITE
};
WaitState wait_state_;
};
} // namespace net
#endif // NET_BASE_TCP_CLIENT_SOCKET_H_
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