/************************************************************************* * * Copyright 2016 Realm Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. * **************************************************************************/ #include <string> #include <vector> #include <realm/util/logger.hpp> namespace realm { class BackupHandler { public: using VersionList = std::vector<int>; using VersionTimeList = std::vector<std::pair<int, int>>; BackupHandler(const std::string& path, const VersionList& accepted, const VersionTimeList& to_be_deleted); bool is_accepted_file_format(int current_file_format_version) const noexcept; bool must_restore_from_backup(int current_file_format_version) const; void restore_from_backup(); void cleanup_backups(); void backup_realm_if_needed(int current_file_format_version, int target_file_format_version); std::string get_prefix(); static std::string get_prefix_from_path(const std::string& path); // default lists of accepted versions and backups to delete when they get old enough static const VersionList accepted_versions_; static const VersionTimeList delete_versions_; private: void prep_logging(); void ensure_logger(); std::string m_path; std::string m_prefix; char m_time_buf[100]; VersionList m_accepted_versions; VersionTimeList m_delete_versions; std::unique_ptr<util::AppendToFileLogger> m_logger; }; } // namespace realm