2017-11-25 11:20:32 +01:00
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/*
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2020-01-18 19:22:19 +01:00
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* Copyright 2003-2020 The Music Player Daemon Project
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2017-11-25 11:20:32 +01:00
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* Save and load mounts of the compound storage to/from the state file.
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*
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*/
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#include "StorageState.hxx"
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#include "fs/io/TextFile.hxx"
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#include "fs/io/BufferedOutputStream.hxx"
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#include "storage/Registry.hxx"
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#include "storage/CompositeStorage.hxx"
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#include "db/plugins/simple/SimpleDatabasePlugin.hxx"
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#include "util/StringCompare.hxx"
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#include "util/Domain.hxx"
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#include "Instance.hxx"
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#include "Log.hxx"
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2017-12-18 23:50:31 +01:00
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#include <set>
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2017-11-25 11:20:32 +01:00
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#include <boost/crc.hpp>
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#define MOUNT_STATE_BEGIN "mount_begin"
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#define MOUNT_STATE_END "mount_end"
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#define MOUNT_STATE_STORAGE_URI "uri: "
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#define MOUNT_STATE_MOUNTED_URL "mounted_url: "
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static constexpr Domain storage_domain("storage");
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void
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storage_state_save(BufferedOutputStream &os, const Instance &instance)
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{
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2018-01-02 14:13:26 +01:00
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if (instance.storage == nullptr)
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return;
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2017-11-25 11:20:32 +01:00
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const auto visitor = [&os](const char *mount_uri, const Storage &storage) {
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std::string uri = storage.MapUTF8("");
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if (uri.empty() || StringIsEmpty(mount_uri))
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return;
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os.Format(
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MOUNT_STATE_BEGIN "\n"
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MOUNT_STATE_STORAGE_URI "%s\n"
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MOUNT_STATE_MOUNTED_URL "%s\n"
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MOUNT_STATE_END "\n", mount_uri, uri.c_str());
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};
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((CompositeStorage*)instance.storage)->VisitMounts(visitor);
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}
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bool
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storage_state_restore(const char *line, TextFile &file, Instance &instance)
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{
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if (!StringStartsWith(line, MOUNT_STATE_BEGIN))
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return false;
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std::string url;
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std::string uri;
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const char* value;
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while ((line = file.ReadLine()) != nullptr) {
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if (StringStartsWith(line, MOUNT_STATE_END))
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break;
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if ((value = StringAfterPrefix(line, MOUNT_STATE_MOUNTED_URL)))
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url = value;
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else if ((value = StringAfterPrefix(line, MOUNT_STATE_STORAGE_URI)))
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uri = value;
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else
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FormatError(storage_domain, "Unrecognized line in mountpoint state: %s", line);
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}
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2018-01-02 14:13:26 +01:00
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if (instance.storage == nullptr)
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/* without storage (a CompositeStorage instance), we
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cannot mount, and therefore we silently ignore the
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state file */
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return true;
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2017-11-25 11:20:32 +01:00
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if (url.empty() || uri.empty()) {
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LogError(storage_domain, "Missing value in mountpoint state.");
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return true;
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}
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FormatDebug(storage_domain, "Restoring mount %s => %s", uri.c_str(), url.c_str());
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2017-12-18 23:48:14 +01:00
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auto &event_loop = instance.io_thread.GetEventLoop();
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2018-01-02 16:11:17 +01:00
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auto storage = CreateStorageURI(event_loop, url.c_str());
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2017-11-25 11:20:32 +01:00
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if (storage == nullptr) {
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FormatError(storage_domain, "Unrecognized storage URI: %s", url.c_str());
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return true;
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}
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2019-02-20 20:48:20 +01:00
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if (auto *db = dynamic_cast<SimpleDatabase *>(instance.GetDatabase())) {
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2017-11-25 11:20:32 +01:00
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try {
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2018-11-19 19:19:20 +01:00
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db->Mount(uri.c_str(), url.c_str());
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2017-11-25 11:20:32 +01:00
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} catch (...) {
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2018-01-02 14:07:23 +01:00
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FormatError(std::current_exception(),
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"Failed to restore mount to %s",
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url.c_str());
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return true;
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2017-11-25 11:20:32 +01:00
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}
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}
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2018-01-02 16:11:17 +01:00
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((CompositeStorage*)instance.storage)->Mount(uri.c_str(),
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2018-01-02 16:18:34 +01:00
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std::move(storage));
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2017-11-25 11:20:32 +01:00
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return true;
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}
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unsigned
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storage_state_get_hash(const Instance &instance)
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{
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2018-01-02 14:13:26 +01:00
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if (instance.storage == nullptr)
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return 0;
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2017-12-18 23:50:31 +01:00
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std::set<std::string> mounts;
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2017-11-25 11:20:32 +01:00
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const auto visitor = [&mounts](const char *mount_uri, const Storage &storage) {
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2017-12-18 23:50:31 +01:00
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mounts.emplace(std::string(mount_uri) + ":" + storage.MapUTF8(""));
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2017-11-25 11:20:32 +01:00
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};
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((CompositeStorage*)instance.storage)->VisitMounts(visitor);
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boost::crc_32_type result;
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for (auto mount: mounts) {
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result.process_bytes(mount.c_str(), mount.length());
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}
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return result.checksum();
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}
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