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/*
* Copyright 2003-2020 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.
*/
#include "config.h"
#include "StateFile.hxx"
#include "output/State.hxx"
#include "queue/PlaylistState.hxx"
#include "fs/io/TextFile.hxx"
#include "fs/io/FileOutputStream.hxx"
#include "fs/io/BufferedOutputStream.hxx"
#include "storage/StorageState.hxx"
#include "Partition.hxx"
#include "Instance.hxx"
#include "mixer/Volume.hxx"
#include "SongLoader.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"
#include <exception>
static constexpr Domain state_file_domain("state_file");
StateFile::StateFile(StateFileConfig &&_config,
Partition &_partition, EventLoop &_loop)
:config(std::move(_config)), path_utf8(config.path.ToUTF8()),
timer_event(_loop, BIND_THIS_METHOD(OnTimeout)),
partition(_partition)
{
}
void
StateFile::RememberVersions() noexcept
{
prev_volume_version = sw_volume_state_get_hash();
prev_output_version = audio_output_state_get_version();
prev_playlist_version = playlist_state_get_hash(partition.playlist,
partition.pc);
#ifdef ENABLE_DATABASE
prev_storage_version = storage_state_get_hash(partition.instance);
#endif
}
bool
StateFile::IsModified() const noexcept
{
return prev_volume_version != sw_volume_state_get_hash() ||
prev_output_version != audio_output_state_get_version() ||
prev_playlist_version != playlist_state_get_hash(partition.playlist,
partition.pc)
#ifdef ENABLE_DATABASE
|| prev_storage_version != storage_state_get_hash(partition.instance)
#endif
;
}
inline void
StateFile::Write(BufferedOutputStream &os)
{
save_sw_volume_state(os);
audio_output_state_save(os, partition.outputs);
#ifdef ENABLE_DATABASE
storage_state_save(os, partition.instance);
#endif
playlist_state_save(os, partition.playlist, partition.pc);
}
inline void
StateFile::Write(OutputStream &os)
{
BufferedOutputStream bos(os);
Write(bos);
bos.Flush();
}
void
StateFile::Write()
{
FormatDebug(state_file_domain,
"Saving state file %s", path_utf8.c_str());
try {
FileOutputStream fos(config.path);
Write(fos);
fos.Commit();
} catch (...) {
LogError(std::current_exception());
}
RememberVersions();
}
void
StateFile::Read()
try {
bool success;
FormatDebug(state_file_domain, "Loading state file %s", path_utf8.c_str());
TextFile file(config.path);
#ifdef ENABLE_DATABASE
const SongLoader song_loader(partition.instance.GetDatabase(),
partition.instance.storage);
#else
const SongLoader song_loader(nullptr, nullptr);
#endif
const char *line;
while ((line = file.ReadLine()) != nullptr) {
success = read_sw_volume_state(line, partition.outputs) ||
audio_output_state_read(line, partition.outputs) ||
playlist_state_restore(config, line, file, song_loader,
partition.playlist,
partition.pc);
#ifdef ENABLE_DATABASE
success = success || storage_state_restore(line, file, partition.instance);
#endif
if (!success)
FormatError(state_file_domain,
"Unrecognized line in state file: %s",
line);
}
RememberVersions();
} catch (...) {
LogError(std::current_exception());
}
void
StateFile::CheckModified() noexcept
{
if (!timer_event.IsActive() && IsModified())
timer_event.Schedule(config.interval);
}
void
StateFile::OnTimeout() noexcept
{
Write();
}
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