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
|
// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/sync_file_system/drive_backend/metadata_db_migration_util.h"
#include "base/files/file_path.h"
#include "base/memory/scoped_ptr.h"
#include "base/strings/string_util.h"
#include "chrome/browser/sync_file_system/drive_backend/drive_backend_util.h"
#include "storage/common/fileapi/file_system_types.h"
#include "storage/common/fileapi/file_system_util.h"
#include "third_party/leveldatabase/src/include/leveldb/db.h"
#include "third_party/leveldatabase/src/include/leveldb/write_batch.h"
#include "url/gurl.h"
namespace sync_file_system {
namespace drive_backend {
SyncStatusCode MigrateDatabaseFromV4ToV3(leveldb::DB* db) {
// Rollback from version 4 to version 3.
// Please see metadata_database_index.cc for version 3 format, and
// metadata_database_index_on_disk.cc for version 4 format.
const char kDatabaseVersionKey[] = "VERSION";
const char kServiceMetadataKey[] = "SERVICE";
const char kFileMetadataKeyPrefix[] = "FILE: ";
const char kFileTrackerKeyPrefix[] = "TRACKER: ";
// Key prefixes used in version 4.
const char kAppRootIDByAppIDKeyPrefix[] = "APP_ROOT: ";
const char kActiveTrackerIDByFileIDKeyPrefix[] = "ACTIVE_FILE: ";
const char kTrackerIDByFileIDKeyPrefix[] = "TRACKER_FILE: ";
const char kMultiTrackerByFileIDKeyPrefix[] = "MULTI_FILE: ";
const char kActiveTrackerIDByParentAndTitleKeyPrefix[] = "ACTIVE_PATH: ";
const char kTrackerIDByParentAndTitleKeyPrefix[] = "TRACKER_PATH: ";
const char kMultiBackingParentAndTitleKeyPrefix[] = "MULTI_PATH: ";
const char kDirtyIDKeyPrefix[] = "DIRTY: ";
const char kDemotedDirtyIDKeyPrefix[] = "DEMOTED_DIRTY: ";
leveldb::WriteBatch write_batch;
write_batch.Put(kDatabaseVersionKey, "3");
scoped_ptr<leveldb::Iterator> itr(db->NewIterator(leveldb::ReadOptions()));
for (itr->SeekToFirst(); itr->Valid(); itr->Next()) {
std::string key = itr->key().ToString();
// Do nothing for valid entries in both versions.
if (StartsWithASCII(key, kServiceMetadataKey, true) ||
StartsWithASCII(key, kFileMetadataKeyPrefix, true) ||
StartsWithASCII(key, kFileTrackerKeyPrefix, true)) {
continue;
}
// Drop entries used in version 4 only.
if (StartsWithASCII(key, kAppRootIDByAppIDKeyPrefix, true) ||
StartsWithASCII(key, kActiveTrackerIDByFileIDKeyPrefix, true) ||
StartsWithASCII(key, kTrackerIDByFileIDKeyPrefix, true) ||
StartsWithASCII(key, kMultiTrackerByFileIDKeyPrefix, true) ||
StartsWithASCII(key, kActiveTrackerIDByParentAndTitleKeyPrefix, true) ||
StartsWithASCII(key, kTrackerIDByParentAndTitleKeyPrefix, true) ||
StartsWithASCII(key, kMultiBackingParentAndTitleKeyPrefix, true) ||
StartsWithASCII(key, kDirtyIDKeyPrefix, true) ||
StartsWithASCII(key, kDemotedDirtyIDKeyPrefix, true)) {
write_batch.Delete(key);
continue;
}
DVLOG(3) << "Unknown key: " << key << " was found.";
}
return LevelDBStatusToSyncStatusCode(
db->Write(leveldb::WriteOptions(), &write_batch));
}
} // namespace drive_backend
} // namespace sync_file_system
|
