1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/*
* Copyright 2003-2021 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.IsPending() && IsModified())
timer_event.Schedule(config.interval);
}
void
StateFile::OnTimeout() noexcept
{
Write();
}
|
