160 lines
3.9 KiB
C++
160 lines
3.9 KiB
C++
/*
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* Copyright 2003-2019 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include "StateFile.hxx"
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#include "output/State.hxx"
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#include "queue/PlaylistState.hxx"
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#include "fs/io/TextFile.hxx"
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#include "fs/io/FileOutputStream.hxx"
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#include "fs/io/BufferedOutputStream.hxx"
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#include "storage/StorageState.hxx"
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#include "Partition.hxx"
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#include "Instance.hxx"
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#include "mixer/Volume.hxx"
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#include "SongLoader.hxx"
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#include "util/Domain.hxx"
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#include "Log.hxx"
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#include <exception>
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static constexpr Domain state_file_domain("state_file");
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StateFile::StateFile(StateFileConfig &&_config,
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Partition &_partition, EventLoop &_loop)
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:config(std::move(_config)), path_utf8(config.path.ToUTF8()),
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timer_event(_loop, BIND_THIS_METHOD(OnTimeout)),
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partition(_partition)
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{
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}
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void
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StateFile::RememberVersions() noexcept
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{
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prev_volume_version = sw_volume_state_get_hash();
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prev_output_version = audio_output_state_get_version();
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prev_playlist_version = playlist_state_get_hash(partition.playlist,
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partition.pc);
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#ifdef ENABLE_DATABASE
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prev_storage_version = storage_state_get_hash(partition.instance);
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#endif
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}
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bool
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StateFile::IsModified() const noexcept
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{
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return prev_volume_version != sw_volume_state_get_hash() ||
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prev_output_version != audio_output_state_get_version() ||
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prev_playlist_version != playlist_state_get_hash(partition.playlist,
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partition.pc)
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#ifdef ENABLE_DATABASE
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|| prev_storage_version != storage_state_get_hash(partition.instance)
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#endif
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;
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}
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inline void
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StateFile::Write(BufferedOutputStream &os)
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{
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save_sw_volume_state(os);
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audio_output_state_save(os, partition.outputs);
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#ifdef ENABLE_DATABASE
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storage_state_save(os, partition.instance);
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#endif
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playlist_state_save(os, partition.playlist, partition.pc);
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}
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inline void
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StateFile::Write(OutputStream &os)
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{
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BufferedOutputStream bos(os);
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Write(bos);
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bos.Flush();
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}
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void
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StateFile::Write()
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{
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FormatDebug(state_file_domain,
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"Saving state file %s", path_utf8.c_str());
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try {
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FileOutputStream fos(config.path);
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Write(fos);
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fos.Commit();
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} catch (...) {
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LogError(std::current_exception());
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}
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RememberVersions();
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}
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void
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StateFile::Read()
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try {
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bool success;
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FormatDebug(state_file_domain, "Loading state file %s", path_utf8.c_str());
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TextFile file(config.path);
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#ifdef ENABLE_DATABASE
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const SongLoader song_loader(partition.instance.GetDatabase(),
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partition.instance.storage);
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#else
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const SongLoader song_loader(nullptr, nullptr);
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#endif
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const char *line;
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while ((line = file.ReadLine()) != nullptr) {
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success = read_sw_volume_state(line, partition.outputs) ||
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audio_output_state_read(line, partition.outputs) ||
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playlist_state_restore(config, line, file, song_loader,
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partition.playlist,
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partition.pc);
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#ifdef ENABLE_DATABASE
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success = success || storage_state_restore(line, file, partition.instance);
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#endif
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if (!success)
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FormatError(state_file_domain,
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"Unrecognized line in state file: %s",
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line);
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}
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RememberVersions();
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} catch (...) {
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LogError(std::current_exception());
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}
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void
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StateFile::CheckModified() noexcept
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{
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if (!timer_event.IsActive() && IsModified())
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timer_event.Schedule(config.interval);
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}
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void
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StateFile::OnTimeout() noexcept
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{
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Write();
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}
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