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// Copyright (c) 2011 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_SOCKET_TCP_CLIENT_SOCKET_H_
#define NET_SOCKET_TCP_CLIENT_SOCKET_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.h"
#include "net/base/address_list.h"
#include "net/base/completion_callback.h"
#include "net/base/net_export.h"
#include "net/log/net_log.h"
#include "net/socket/connection_attempts.h"
#include "net/socket/stream_socket.h"
#include "net/socket/tcp_socket.h"
namespace net {
// A client socket that uses TCP as the transport layer.
class NET_EXPORT TCPClientSocket : public StreamSocket {
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.
TCPClientSocket(const AddressList& addresses,
net::NetLog* net_log,
const net::NetLog::Source& source);
// Adopts the given, connected socket and then acts as if Connect() had been
// called. This function is used by TCPServerSocket and for testing.
TCPClientSocket(scoped_ptr<TCPSocket> connected_socket,
const IPEndPoint& peer_address);
~TCPClientSocket() override;
// Binds the socket to a local IP address and port.
int Bind(const IPEndPoint& address);
// StreamSocket implementation.
int Connect(const CompletionCallback& callback) override;
void Disconnect() override;
bool IsConnected() const override;
bool IsConnectedAndIdle() const override;
int GetPeerAddress(IPEndPoint* address) const override;
int GetLocalAddress(IPEndPoint* address) const override;
const BoundNetLog& NetLog() const override;
void SetSubresourceSpeculation() override;
void SetOmniboxSpeculation() override;
bool WasEverUsed() const override;
bool UsingTCPFastOpen() const override;
void EnableTCPFastOpenIfSupported() override;
bool WasNpnNegotiated() const override;
NextProto GetNegotiatedProtocol() const override;
bool GetSSLInfo(SSLInfo* ssl_info) override;
// Socket implementation.
// Multiple outstanding requests are not supported.
// Full duplex mode (reading and writing at the same time) is supported.
int Read(IOBuffer* buf,
int buf_len,
const CompletionCallback& callback) override;
int Write(IOBuffer* buf,
int buf_len,
const CompletionCallback& callback) override;
int SetReceiveBufferSize(int32 size) override;
int SetSendBufferSize(int32 size) override;
virtual bool SetKeepAlive(bool enable, int delay);
virtual bool SetNoDelay(bool no_delay);
void GetConnectionAttempts(ConnectionAttempts* out) const override;
void ClearConnectionAttempts() override;
void AddConnectionAttempts(const ConnectionAttempts& attempts) override;
private:
// State machine for connecting the socket.
enum ConnectState {
CONNECT_STATE_CONNECT,
CONNECT_STATE_CONNECT_COMPLETE,
CONNECT_STATE_NONE,
};
// State machine used by Connect().
int DoConnectLoop(int result);
int DoConnect();
int DoConnectComplete(int result);
// Helper used by Disconnect(), which disconnects minus resetting
// current_address_index_ and bind_address_.
void DoDisconnect();
void DidCompleteConnect(int result);
void DidCompleteReadWrite(const CompletionCallback& callback, int result);
int OpenSocket(AddressFamily family);
// Emits histograms for TCP metrics, at the time the socket is
// disconnected.
void EmitTCPMetricsHistogramsOnDisconnect();
scoped_ptr<TCPSocket> socket_;
// Local IP address and port we are bound to. Set to NULL if Bind()
// wasn't called (in that case OS chooses address/port).
scoped_ptr<IPEndPoint> bind_address_;
// The list of addresses we should try in order to establish a connection.
AddressList addresses_;
// Where we are in above list. Set to -1 if uninitialized.
int current_address_index_;
// External callback; called when connect is complete.
CompletionCallback connect_callback_;
// The next state for the Connect() state machine.
ConnectState next_connect_state_;
// This socket was previously disconnected and has not been re-connected.
bool previously_disconnected_;
// Record of connectivity and transmissions, for use in speculative connection
// histograms.
UseHistory use_history_;
// Failed connection attempts made while trying to connect this socket.
ConnectionAttempts connection_attempts_;
DISALLOW_COPY_AND_ASSIGN(TCPClientSocket);
};
} // namespace net
#endif // NET_SOCKET_TCP_CLIENT_SOCKET_H_
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