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
|
/*
* Copyright 2003-2017 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.
*/
/*
* Save and load mounts of the compound storage to/from the state file.
*
*/
#include "config.h"
#include "StorageState.hxx"
#include "fs/io/TextFile.hxx"
#include "fs/io/BufferedOutputStream.hxx"
#include "storage/Registry.hxx"
#include "storage/CompositeStorage.hxx"
#include "db/plugins/simple/SimpleDatabasePlugin.hxx"
#include "util/StringCompare.hxx"
#include "util/Domain.hxx"
#include "Instance.hxx"
#include "IOThread.hxx"
#include "Log.hxx"
#include <set>
#include <boost/crc.hpp>
#define MOUNT_STATE_BEGIN "mount_begin"
#define MOUNT_STATE_END "mount_end"
#define MOUNT_STATE_STORAGE_URI "uri: "
#define MOUNT_STATE_MOUNTED_URL "mounted_url: "
static constexpr Domain storage_domain("storage");
void
storage_state_save(BufferedOutputStream &os, const Instance &instance)
{
const auto visitor = [&os](const char *mount_uri, const Storage &storage) {
std::string uri = storage.MapUTF8("");
if (uri.empty() || StringIsEmpty(mount_uri))
return;
os.Format(
MOUNT_STATE_BEGIN "\n"
MOUNT_STATE_STORAGE_URI "%s\n"
MOUNT_STATE_MOUNTED_URL "%s\n"
MOUNT_STATE_END "\n", mount_uri, uri.c_str());
};
((CompositeStorage*)instance.storage)->VisitMounts(visitor);
}
bool
storage_state_restore(const char *line, TextFile &file, Instance &instance)
{
if (!StringStartsWith(line, MOUNT_STATE_BEGIN))
return false;
std::string url;
std::string uri;
const char* value;
while ((line = file.ReadLine()) != nullptr) {
if (StringStartsWith(line, MOUNT_STATE_END))
break;
if ((value = StringAfterPrefix(line, MOUNT_STATE_MOUNTED_URL)))
url = value;
else if ((value = StringAfterPrefix(line, MOUNT_STATE_STORAGE_URI)))
uri = value;
else
FormatError(storage_domain, "Unrecognized line in mountpoint state: %s", line);
}
if (url.empty() || uri.empty()) {
LogError(storage_domain, "Missing value in mountpoint state.");
return true;
}
FormatDebug(storage_domain, "Restoring mount %s => %s", uri.c_str(), url.c_str());
auto &event_loop = io_thread_get();
Storage *storage = CreateStorageURI(event_loop, url.c_str());
if (storage == nullptr) {
FormatError(storage_domain, "Unrecognized storage URI: %s", url.c_str());
return true;
}
Database *db = instance.database;
if (db != nullptr && db->IsPlugin(simple_db_plugin)) {
try {
((SimpleDatabase *)db)->Mount(uri.c_str(), url.c_str());
} catch (...) {
throw;
}
}
((CompositeStorage*)instance.storage)->Mount(uri.c_str(), storage);
return true;
}
unsigned
storage_state_get_hash(const Instance &instance)
{
std::set<std::string> mounts;
const auto visitor = [&mounts](const char *mount_uri, const Storage &storage) {
mounts.emplace(std::string(mount_uri) + ":" + storage.MapUTF8(""));
};
((CompositeStorage*)instance.storage)->VisitMounts(visitor);
boost::crc_32_type result;
for (auto mount: mounts) {
result.process_bytes(mount.c_str(), mount.length());
}
return result.checksum();
}
|
