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// Copyright 2013 The Chromium Authors
// 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 <memory>
#include "base/files/file_path.h"
#include "base/strings/string_util.h"
#include "chrome/browser/sync_file_system/drive_backend/drive_backend_util.h"
#include "storage/common/file_system/file_system_types.h"
#include "storage/common/file_system/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");
std::unique_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 (base::StartsWith(key, kServiceMetadataKey,
base::CompareCase::SENSITIVE) ||
base::StartsWith(key, kFileMetadataKeyPrefix,
base::CompareCase::SENSITIVE) ||
base::StartsWith(key, kFileTrackerKeyPrefix,
base::CompareCase::SENSITIVE)) {
continue;
}
// Drop entries used in version 4 only.
if (base::StartsWith(key, kAppRootIDByAppIDKeyPrefix,
base::CompareCase::SENSITIVE) ||
base::StartsWith(key, kActiveTrackerIDByFileIDKeyPrefix,
base::CompareCase::SENSITIVE) ||
base::StartsWith(key, kTrackerIDByFileIDKeyPrefix,
base::CompareCase::SENSITIVE) ||
base::StartsWith(key, kMultiTrackerByFileIDKeyPrefix,
base::CompareCase::SENSITIVE) ||
base::StartsWith(key, kActiveTrackerIDByParentAndTitleKeyPrefix,
base::CompareCase::SENSITIVE) ||
base::StartsWith(key, kTrackerIDByParentAndTitleKeyPrefix,
base::CompareCase::SENSITIVE) ||
base::StartsWith(key, kMultiBackingParentAndTitleKeyPrefix,
base::CompareCase::SENSITIVE) ||
base::StartsWith(key, kDirtyIDKeyPrefix,
base::CompareCase::SENSITIVE) ||
base::StartsWith(key, kDemotedDirtyIDKeyPrefix,
base::CompareCase::SENSITIVE)) {
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
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