/*
* Copyright (C) 2003-2014 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_NFS_FILE_READER_HXX
#define MPD_NFS_FILE_READER_HXX
#include "check.h"
#include "Lease.hxx"
#include "Callback.hxx"
#include "event/DeferredMonitor.hxx"
#include "Compiler.h"
#include <string>
#include <stdint.h>
#include <stddef.h>
#include <sys/stat.h>
struct nfsfh;
class NfsConnection;
class NfsFileReader : NfsLease, NfsCallback, DeferredMonitor {
enum class State {
INITIAL,
DEFER,
MOUNT,
OPEN,
STAT,
READ,
IDLE,
};
State state;
std::string server, export_name;
const char *path;
NfsConnection *connection;
nfsfh *fh;
public:
NfsFileReader();
~NfsFileReader();
void Close();
void DeferClose();
bool Open(const char *uri, Error &error);
bool Read(uint64_t offset, size_t size, Error &error);
void CancelRead();
bool IsIdle() const {
return state == State::IDLE;
}
protected:
virtual void OnNfsFileOpen(uint64_t size) = 0;
virtual void OnNfsFileRead(const void *data, size_t size) = 0;
virtual void OnNfsFileError(Error &&error) = 0;
private:
/**
* Cancel the current operation, if any. The NfsLease must be
* unregistered already.
*/
void CancelOrClose();
void OpenCallback(nfsfh *_fh);
void StatCallback(const struct stat *st);
/* virtual methods from NfsLease */
void OnNfsConnectionReady() final;
void OnNfsConnectionFailed(const Error &error) final;
void OnNfsConnectionDisconnected(const Error &error) final;
/* virtual methods from NfsCallback */
void OnNfsCallback(unsigned status, void *data) final;
void OnNfsError(Error &&error) final;
/* virtual methods from DeferredMonitor */
void RunDeferred() final;
};
#endif
