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/*
* Copyright (C) 2003-2013 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_BUFFERED_SOCKET_HXX
#define MPD_BUFFERED_SOCKET_HXX
#include "check.h"
#include "SocketMonitor.hxx"
#include "util/PeakBuffer.hxx"
#include "gcc.h"
#include <type_traits>
#include <stddef.h>
struct fifo_buffer;
class EventLoop;
class BufferedSocket : private SocketMonitor {
typedef std::make_signed<size_t>::type ssize_t;
fifo_buffer *input;
PeakBuffer output;
public:
BufferedSocket(int _fd, EventLoop &_loop,
size_t normal_size, size_t peak_size=0)
:SocketMonitor(_fd, _loop), input(nullptr),
output(normal_size, peak_size) {
ScheduleRead();
}
~BufferedSocket();
using SocketMonitor::IsDefined;
using SocketMonitor::Close;
private:
ssize_t DirectWrite(const void *data, size_t length);
ssize_t DirectRead(void *data, size_t length);
/**
* Send data from the output buffer to the socket.
*
* @return false if the socket has been closed
*/
bool WriteFromBuffer();
/**
* Receive data from the socket to the input buffer.
*
* @return false if the socket has been closed
*/
bool ReadToBuffer();
protected:
/**
* @return false if the socket has been closed
*/
bool Write(const void *data, size_t length);
/**
* @return false if the socket has been closed
*/
bool ResumeInput();
/**
* Mark a portion of the input buffer "consumed". Only
* allowed to be called from OnSocketInput(). This method
* does not invalidate the pointer passed to OnSocketInput()
* yet.
*/
void ConsumeInput(size_t nbytes);
enum class InputResult {
/**
* The method was successful, and it is ready to
* read more data.
*/
MORE,
/**
* The method does not want to get more data for now.
* It will call ResumeInput() when it's ready for
* more.
*/
PAUSE,
/**
* The method wants to be called again immediately, if
* there's more data in the buffer.
*/
AGAIN,
/**
* The method has closed the socket.
*/
CLOSED,
};
virtual InputResult OnSocketInput(const void *data, size_t length) = 0;
virtual void OnSocketError(GError *error) = 0;
virtual void OnSocketClosed() = 0;
private:
virtual void OnSocketReady(unsigned flags) override;
};
#endif
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