/* * 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 #include #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; } #ifdef ENABLE_DATABASE Database *db = instance.database; if (db != nullptr && db->IsPlugin(simple_db_plugin)) { try { ((SimpleDatabase *)db)->Mount(uri.c_str(), url.c_str()); } catch (...) { throw; } } #endif ((CompositeStorage*)instance.storage)->Mount(uri.c_str(), storage); return true; } unsigned storage_state_get_hash(const Instance &instance) { std::list mounts; const auto visitor = [&mounts](const char *mount_uri, const Storage &storage) { mounts.push_back(std::string(mount_uri) + ":" + storage.MapUTF8("")); }; ((CompositeStorage*)instance.storage)->VisitMounts(visitor); mounts.sort(); boost::crc_32_type result; for (auto mount: mounts) { result.process_bytes(mount.c_str(), mount.length()); } return result.checksum(); }