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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_UDP_UDP_SOCKET_LIBEVENT_H_
#define NET_UDP_UDP_SOCKET_LIBEVENT_H_
#pragma once
#include "base/message_loop.h"
#include "base/ref_counted.h"
#include "base/scoped_ptr.h"
#include "base/threading/non_thread_safe.h"
#include "net/base/completion_callback.h"
#include "net/base/ip_endpoint.h"
#include "net/base/net_log.h"
#include "net/socket/client_socket.h"
namespace net {
class BoundNetLog;
class UDPSocketLibevent : public base::NonThreadSafe {
public:
UDPSocketLibevent(net::NetLog* net_log,
const net::NetLog::Source& source);
virtual ~UDPSocketLibevent();
// Connect the socket to connect with a certain |address|.
// Returns a net error code.
int Connect(const IPEndPoint& address);
// Bind the address/port for this socket to |address|. This is generally
// only used on a server.
// Returns a net error code.
int Bind(const IPEndPoint& address);
// Close the socket.
void Close();
// Copy the remote udp address into |address| and return a network error code.
int GetPeerAddress(IPEndPoint* address) const;
// Copy the local udp address into |address| and return a network error code.
// (similar to getsockname)
int GetLocalAddress(IPEndPoint* address) const;
// IO:
// Multiple outstanding read requests are not supported.
// Full duplex mode (reading and writing at the same time) is supported
// Read from the socket.
// Only usable from the client-side of a UDP socket, after the socket
// has been connected.
int Read(IOBuffer* buf, int buf_len, CompletionCallback* callback);
// Write to the socket.
// Only usable from the client-side of a UDP socket, after the socket
// has been connected.
int Write(IOBuffer* buf, int buf_len, CompletionCallback* callback);
// Read from a socket and receive sender address information.
// |buf| is the buffer to read data into.
// |buf_len| is the maximum amount of data to read.
// |address| is a buffer provided by the caller for receiving the sender
// address information about the received data. This buffer must be kept
// alive by the caller until the callback is placed.
// |address_length| is a ptr to the length of the |address| buffer. This
// is an input parameter containing the maximum size |address| can hold
// and also an output parameter for the size of |address| upon completion.
// |callback| the callback on completion of the Recv.
// Returns a net error code, or ERR_IO_PENDING if the IO is in progress.
// If ERR_IO_PENDING is returned, the caller must keep |buf|, |address|,
// and |address_length| alive until the callback is called.
int RecvFrom(IOBuffer* buf,
int buf_len,
IPEndPoint* address,
CompletionCallback* callback);
// Send to a socket with a particular destination.
// |buf| is the buffer to send
// |buf_len| is the number of bytes to send
// |address| is the recipient address.
// |address_length| is the size of the recipient address
// |callback| is the user callback function to call on complete.
// Returns a net error code, or ERR_IO_PENDING if the IO is in progress.
// If ERR_IO_PENDING is returned, the caller must keep |buf| and |address|
// alive until the callback is called.
int SendTo(IOBuffer* buf,
int buf_len,
const IPEndPoint& address,
CompletionCallback* callback);
// Returns true if the socket is already connected or bound.
bool is_connected() const { return socket_ != kInvalidSocket; }
private:
static const int kInvalidSocket = -1;
class ReadWatcher : public MessageLoopForIO::Watcher {
public:
explicit ReadWatcher(UDPSocketLibevent* socket) : socket_(socket) {}
// MessageLoopForIO::Watcher methods
virtual void OnFileCanReadWithoutBlocking(int /* fd */) {
if (socket_->read_callback_)
socket_->DidCompleteRead();
}
virtual void OnFileCanWriteWithoutBlocking(int /* fd */) {}
private:
UDPSocketLibevent* const socket_;
DISALLOW_COPY_AND_ASSIGN(ReadWatcher);
};
class WriteWatcher : public MessageLoopForIO::Watcher {
public:
explicit WriteWatcher(UDPSocketLibevent* socket) : socket_(socket) {}
// MessageLoopForIO::Watcher methods
virtual void OnFileCanReadWithoutBlocking(int /* fd */) {}
virtual void OnFileCanWriteWithoutBlocking(int /* fd */) {
if (socket_->write_callback_)
socket_->DidCompleteWrite();
}
private:
UDPSocketLibevent* const socket_;
DISALLOW_COPY_AND_ASSIGN(WriteWatcher);
};
void DoReadCallback(int rv);
void DoWriteCallback(int rv);
void DidCompleteRead();
void DidCompleteWrite();
// Returns the OS error code (or 0 on success).
int CreateSocket(const IPEndPoint& address);
// Same as SendTo(), except that address is passed by pointer
// instead of by reference. It is called from Write() with |address|
// set to NULL.
int SendToOrWrite(IOBuffer* buf,
int buf_len,
const IPEndPoint* address,
CompletionCallback* callback);
int InternalRecvFrom(IOBuffer* buf, int buf_len, IPEndPoint* address);
int InternalSendTo(IOBuffer* buf, int buf_len, const IPEndPoint* address);
int socket_;
// These are mutable since they're just cached copies to make
// GetPeerAddress/GetLocalAddress smarter.
mutable scoped_ptr<IPEndPoint> local_address_;
mutable scoped_ptr<IPEndPoint> remote_address_;
// 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 InternalRead() to retry Read requests
scoped_refptr<IOBuffer> read_buf_;
int read_buf_len_;
IPEndPoint* recv_from_address_;
// The buffer used by InternalWrite() to retry Write requests
scoped_refptr<IOBuffer> write_buf_;
int write_buf_len_;
scoped_ptr<IPEndPoint> send_to_address_;
// External callback; called when read is complete.
CompletionCallback* read_callback_;
// External callback; called when write is complete.
CompletionCallback* write_callback_;
BoundNetLog net_log_;
DISALLOW_COPY_AND_ASSIGN(UDPSocketLibevent);
};
} // namespace net
#endif // NET_UDP_UDP_SOCKET_LIBEVENT_H_
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