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// Copyright (c) 2006-2009 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_SOCKET_TCP_CLIENT_SOCKET_LIBEVENT_H_
#define NET_SOCKET_TCP_CLIENT_SOCKET_LIBEVENT_H_
#include <sys/socket.h> // for struct sockaddr
#include "base/message_loop.h"
#include "base/ref_counted.h"
#include "base/scoped_ptr.h"
#include "net/base/address_list.h"
#include "net/base/completion_callback.h"
#include "net/socket/client_socket.h"
struct event; // From libevent
namespace net {
// A client socket that uses TCP as the transport layer.
class TCPClientSocketLibevent : public ClientSocket {
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 TCPClientSocketLibevent(const AddressList& addresses);
virtual ~TCPClientSocketLibevent();
// ClientSocket methods:
virtual int Connect(CompletionCallback* callback);
virtual void Disconnect();
virtual bool IsConnected() const;
virtual bool IsConnectedAndIdle() const;
// Socket methods:
// Multiple outstanding requests are not supported.
// Full duplex mode (reading and writing at the same time) is supported
virtual int Read(IOBuffer* buf, int buf_len, CompletionCallback* callback);
virtual int Write(IOBuffer* buf, int buf_len, CompletionCallback* callback);
// Identical to posix system call of same name
// Needed by ssl_client_socket_nss
virtual int GetPeerName(struct sockaddr *name, socklen_t *namelen);
private:
class ReadWatcher : public MessageLoopForIO::Watcher {
public:
explicit ReadWatcher(TCPClientSocketLibevent* socket) : socket_(socket) {}
// MessageLoopForIO::Watcher methods
virtual void OnFileCanReadWithoutBlocking(int /* fd */) {
if (socket_->read_callback_)
socket_->DidCompleteRead();
}
virtual void OnFileCanWriteWithoutBlocking(int /* fd */) {}
private:
TCPClientSocketLibevent* const socket_;
DISALLOW_COPY_AND_ASSIGN(ReadWatcher);
};
class WriteWatcher : public MessageLoopForIO::Watcher {
public:
explicit WriteWatcher(TCPClientSocketLibevent* socket) : socket_(socket) {}
// MessageLoopForIO::Watcher methods
virtual void OnFileCanReadWithoutBlocking(int /* fd */) {}
virtual void OnFileCanWriteWithoutBlocking(int /* fd */) {
if (socket_->waiting_connect_) {
socket_->DidCompleteConnect();
} else if (socket_->write_callback_) {
socket_->DidCompleteWrite();
}
}
private:
TCPClientSocketLibevent* const socket_;
DISALLOW_COPY_AND_ASSIGN(WriteWatcher);
};
void DoReadCallback(int rv);
void DoWriteCallback(int rv);
void DidCompleteRead();
void DidCompleteWrite();
void DidCompleteConnect();
int CreateSocket(const struct addrinfo* ai);
int socket_;
// The list of addresses we should try in order to establish a connection.
AddressList addresses_;
// Where we are in above list, or NULL if all addrinfos have been tried.
const struct addrinfo* current_ai_;
// Whether we're currently waiting for connect() to complete
bool waiting_connect_;
// The socket's libevent wrappers
MessageLoopForIO::FileDescriptorWatcher read_socket_watcher_;
MessageLoopForIO::FileDescriptorWatcher write_socket_watcher_;
// The corresponding watchers for reads and writes.
ReadWatcher read_watcher_;
WriteWatcher write_watcher_;
// The buffer used by OnSocketReady to retry Read requests
scoped_refptr<IOBuffer> read_buf_;
int read_buf_len_;
// The buffer used by OnSocketReady to retry Write requests
scoped_refptr<IOBuffer> write_buf_;
int write_buf_len_;
// External callback; called when read is complete.
CompletionCallback* read_callback_;
// External callback; called when write is complete.
CompletionCallback* write_callback_;
DISALLOW_COPY_AND_ASSIGN(TCPClientSocketLibevent);
};
} // namespace net
#endif // NET_SOCKET_TCP_CLIENT_SOCKET_LIBEVENT_H_
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