Save and restore downloads between launches.

Telegram/SourceFiles/core/file_location.cpp

@@ -39,23 +39,34 @@ FileLocation::FileLocation(const QString &name) : fname(name) {
 		size = 0;
 	} else {
 		setBookmark(Platform::PathBookmark(name));
+		resolveFromInfo(QFileInfo(name));
+	}
+}
 
-		QFileInfo f(name);
-		if (f.exists()) {
-			qint64 s = f.size();
-			if (s > INT_MAX) {
-				fname = QString();
-				_bookmark = nullptr;
-				size = 0;
-			} else {
-				modified = f.lastModified();
-				size = qint32(s);
-			}
-		} else {
+FileLocation::FileLocation(const QFileInfo &info) : fname(info.filePath()) {
+	if (fname.isEmpty()) {
+		size = 0;
+	} else {
+		setBookmark(Platform::PathBookmark(fname));
+		resolveFromInfo(info);
+	}
+}
+
+void FileLocation::resolveFromInfo(const QFileInfo &info) {
+	if (info.exists()) {
+		const auto s = info.size();
+		if (s > INT_MAX) {
 			fname = QString();
 			_bookmark = nullptr;
 			size = 0;
+		} else {
+			modified = info.lastModified();
+			size = qint32(s);
 		}
+	} else {
+		fname = QString();
+		_bookmark = nullptr;
+		size = 0;
 	}
 }
 

Telegram/SourceFiles/core/file_location.h

@@ -9,6 +9,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include <QtCore/QDateTime>
 
+class QFileInfo;
+
 namespace Platform {
 class FileBookmark;
 } // namespace Platform
@@ -35,6 +37,7 @@ class FileLocation {
 public:
 	FileLocation() = default;
 	explicit FileLocation(const QString &name);
+	explicit FileLocation(const QFileInfo &info);
 
 	static FileLocation InMediaCacheLocation();
 
@@ -55,6 +58,8 @@ public:
 	qint32 size;
 
 private:
+	void resolveFromInfo(const QFileInfo &info);
+
 	std::shared_ptr<Platform::FileBookmark> _bookmark;
 
 };

Telegram/SourceFiles/data/data_document.cpp

@@ -1256,7 +1256,8 @@ bool DocumentData::isNull() const {
 	return !hasRemoteLocation()
 		&& !hasWebLocation()
 		&& _url.isEmpty()
-		&& !uploading();
+		&& !uploading()
+		&& _location.isEmpty();
 }
 
 MTPInputDocument DocumentData::mtpInput() const {

Telegram/SourceFiles/data/data_download_manager.cpp

@@ -14,18 +14,25 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "data/data_user.h"
 #include "data/data_channel.h"
 #include "base/unixtime.h"
+#include "base/random.h"
 #include "main/main_session.h"
 #include "main/main_account.h"
+#include "storage/storage_account.h"
 #include "history/history.h"
 #include "history/history_item.h"
 #include "history/history_message.h"
 #include "core/application.h"
+#include "core/mime_type.h"
 #include "ui/controls/download_bar.h"
+#include "storage/serialize_common.h"
+#include "apiwrap.h"
 
 namespace Data {
 namespace {
 
 constexpr auto kClearLoadingTimeout = 5 * crl::time(1000);
+constexpr auto kMaxFileSize = 2000 * 1024 * 1024;
+constexpr auto kMaxResolvePerAttempt = 100;
 
 constexpr auto ByItem = [](const auto &entry) {
 	if constexpr (std::is_same_v<decltype(entry), const DownloadingId&>) {
@@ -55,6 +62,8 @@ DownloadManager::~DownloadManager() = default;
 
 void DownloadManager::trackSession(not_null<Main::Session*> session) {
 	auto &data = _sessions.emplace(session, SessionData()).first->second;
+	data.downloaded = deserialize(session);
+	data.resolveNeeded = data.downloaded.size();
 
 	session->data().itemRepaintRequest(
 	) | rpl::filter([=](not_null<const HistoryItem*> item) {
@@ -183,6 +192,11 @@ void DownloadManager::addLoaded(
 	Expects(object.item != nullptr);
 	Expects(object.document || object.photo);
 
+	const auto size = QFileInfo(path).size();
+	if (size <= 0 || size > kMaxFileSize) {
+		return;
+	}
+
 	const auto item = object.item;
 	auto &data = sessionData(item);
 
@@ -193,6 +207,7 @@ void DownloadManager::addLoaded(
 		.download = id,
 		.started = started,
 		.path = path,
+		.size = int32(size),
 		.itemId = item->fullId(),
 		.peerAccessHash = PeerAccessHash(item->history()->peer),
 		.object = std::make_unique<DownloadObject>(object),
@@ -200,6 +215,8 @@ void DownloadManager::addLoaded(
 	_loaded.emplace(item);
 	_loadedAdded.fire(&data.downloaded.back());
 
+	writePostponed(&item->history()->session());
+
 	const auto i = ranges::find(data.downloading, item, ByItem);
 	if (i != end(data.downloading)) {
 		auto &entry = *i;
@@ -261,8 +278,11 @@ void DownloadManager::clearLoading() {
 	}
 }
 
-auto DownloadManager::loadedList() const
+auto DownloadManager::loadedList()
 -> ranges::any_view<const DownloadedId*, ranges::category::input> {
+	for (auto &[session, data] : _sessions) {
+		resolve(session, data);
+	}
 	return ranges::views::all(
 		_sessions
 	) | ranges::views::transform([=](const auto &pair) {
@@ -276,6 +296,144 @@ auto DownloadManager::loadedList() const
 	}) | ranges::views::join;
 }
 
+void DownloadManager::resolve(
+		not_null<Main::Session*> session,
+		SessionData &data) {
+	if (data.resolveSentTotal >= data.resolveNeeded
+		|| data.resolveSentTotal >= kMaxResolvePerAttempt) {
+		return;
+	}
+	struct Prepared {
+		uint64 peerAccessHash = 0;
+		QVector<MTPInputMessage> ids;
+	};
+	auto &owner = session->data();
+	auto prepared = base::flat_map<PeerId, Prepared>();
+	auto last = begin(data.downloaded);
+	auto from = last + (data.resolveNeeded - data.resolveSentTotal);
+	for (auto i = from; i != last;) {
+		auto &id = *--i;
+		const auto msgId = id.itemId.msg;
+		const auto info = QFileInfo(id.path);
+		if (!info.exists() || info.size() != id.size) {
+			// Mark as deleted.
+			id.path = QString();
+		} else if (!owner.message(id.itemId) && IsServerMsgId(msgId)) {
+			const auto groupByPeer = peerIsChannel(id.itemId.peer)
+				? id.itemId.peer
+				: session->userPeerId();
+			auto &perPeer = prepared[groupByPeer];
+			if (peerIsChannel(id.itemId.peer) && !perPeer.peerAccessHash) {
+				perPeer.peerAccessHash = id.peerAccessHash;
+			}
+			perPeer.ids.push_back(MTP_inputMessageID(MTP_int(msgId.bare)));
+		}
+		if (++data.resolveSentTotal >= kMaxResolvePerAttempt) {
+			break;
+		}
+	}
+	const auto check = [=] {
+		auto &data = sessionData(session);
+		if (!data.resolveSentRequests) {
+			resolveRequestsFinished(session, data);
+		}
+	};
+	const auto requestFinished = [=] {
+		--sessionData(session).resolveSentRequests;
+		check();
+	};
+	for (auto &[peer, perPeer] : prepared) {
+		if (const auto channelId = peerToChannel(peer)) {
+			session->api().request(MTPchannels_GetMessages(
+				MTP_inputChannel(
+					MTP_long(channelId.bare),
+					MTP_long(perPeer.peerAccessHash)),
+				MTP_vector<MTPInputMessage>(perPeer.ids)
+			)).done([=](const MTPmessages_Messages &result) {
+				session->data().processExistingMessages(
+					session->data().channelLoaded(channelId),
+					result);
+				requestFinished();
+			}).fail(requestFinished).send();
+		} else {
+			session->api().request(MTPmessages_GetMessages(
+				MTP_vector<MTPInputMessage>(perPeer.ids)
+			)).done([=](const MTPmessages_Messages &result) {
+				session->data().processExistingMessages(nullptr, result);
+				requestFinished();
+			}).fail(requestFinished).send();
+		}
+	}
+	data.resolveSentRequests += prepared.size();
+	check();
+}
+
+void DownloadManager::resolveRequestsFinished(
+		not_null<Main::Session*> session,
+		SessionData &data) {
+	auto &owner = session->data();
+	for (; data.resolveSentTotal > 0; --data.resolveSentTotal) {
+		const auto i = begin(data.downloaded) + (--data.resolveNeeded);
+		if (i->path.isEmpty()) {
+			data.downloaded.erase(i);
+			continue;
+		}
+		const auto item = owner.message(i->itemId);
+		const auto media = item ? item->media() : nullptr;
+		const auto document = media ? media->document() : nullptr;
+		const auto photo = media ? media->photo() : nullptr;
+		if (i->download.type == DownloadType::Document
+			&& (!document || document->id != i->download.objectId)) {
+			generateEntry(session, *i);
+		} else if (i->download.type == DownloadType::Photo
+			&& (!photo || photo->id != i->download.objectId)) {
+			generateEntry(session, *i);
+		} else {
+			i->object = std::make_unique<DownloadObject>(DownloadObject{
+				.item = item,
+				.document = document,
+				.photo = photo,
+			});
+			_loaded.emplace(item);
+		}
+		_loadedAdded.fire(&*i);
+	}
+	crl::on_main(session, [=] {
+		resolve(session, sessionData(session));
+	});
+}
+
+void DownloadManager::generateEntry(
+		not_null<Main::Session*> session,
+		DownloadedId &id) {
+	Expects(!id.object);
+
+	const auto info = QFileInfo(id.path);
+	const auto document = session->data().document(
+		base::RandomValue<DocumentId>(),
+		0, // accessHash
+		QByteArray(), // fileReference
+		TimeId(id.started / 1000),
+		QVector<MTPDocumentAttribute>(
+			1,
+			MTP_documentAttributeFilename(
+				MTP_string(info.fileName()))),
+		Core::MimeTypeForFile(info).name(),
+		InlineImageLocation(), // inlineThumbnail
+		ImageWithLocation(), // thumbnail
+		ImageWithLocation(), // videoThumbnail
+		0, // dc
+		id.size);
+	document->setLocation(Core::FileLocation(info));
+	_generatedDocuments.emplace(document);
+
+	id.object = std::make_unique<DownloadObject>(DownloadObject{
+		.item = generateFakeItem(document),
+		.document = document,
+	});
+	_loaded.emplace(id.object->item);
+}
+
 auto DownloadManager::loadedAdded() const
 -> rpl::producer<not_null<const DownloadedId*>> {
 	return _loadedAdded.events();
@@ -353,18 +511,30 @@ void DownloadManager::removed(not_null<const HistoryItem*> item) {
 	}
 }
 
-not_null<HistoryItem*> DownloadManager::generateItem(
-		const DownloadObject &object) {
-	Expects(object.document || object.photo);
+not_null<HistoryItem*> DownloadManager::regenerateItem(
+		const DownloadObject &previous) {
+	return generateItem(previous.item, previous.document, previous.photo);
+}
 
-	const auto session = object.document
-		? &object.document->session()
-		: &object.photo->session();
-	const auto fromId = object.item
-		? object.item->from()->id
+not_null<HistoryItem*> DownloadManager::generateFakeItem(
+		not_null<DocumentData*> document) {
+	return generateItem(nullptr, document, nullptr);
+}
+
+not_null<HistoryItem*> DownloadManager::generateItem(
+		HistoryItem *previousItem,
+		DocumentData *document,
+		PhotoData *photo) {
+	Expects(document || photo);
+
+	const auto session = document
+		? &document->session()
+		: &photo->session();
+	const auto fromId = previousItem
+		? previousItem->from()->id
 		: session->userPeerId();
-	const auto history = object.item
-		? object.item->history()
+	const auto history = previousItem
+		? previousItem->history()
 		: session->data().history(session->user());
 	const auto flags = MessageFlag::FakeHistoryItem;
 	const auto replyTo = MsgId();
@@ -386,9 +556,7 @@ not_null<HistoryItem*> DownloadManager::generateItem(
 			caption,
 			HistoryMessageMarkupData());
 	};
-	const auto result = object.document
-		? make(object.document)
-		: make(object.photo);
+	const auto result = document ? make(document) : make(photo);
 	_generated.emplace(result);
 	return result;
 }
@@ -400,7 +568,7 @@ void DownloadManager::detach(DownloadedId &id) {
 
 	// Maybe generate new document?
 	const auto was = id.object->item;
-	const auto now = generateItem(*id.object);
+	const auto now = regenerateItem(*id.object);
 	_loaded.remove(was);
 	_loaded.emplace(now);
 	id.object->item = now;
@@ -416,19 +584,139 @@ DownloadManager::SessionData &DownloadManager::sessionData(
 	return i->second;
 }
 
+const DownloadManager::SessionData &DownloadManager::sessionData(
+		not_null<Main::Session*> session) const {
+	const auto i = _sessions.find(session);
+	Assert(i != end(_sessions));
+	return i->second;
+}
+
 DownloadManager::SessionData &DownloadManager::sessionData(
 		not_null<const HistoryItem*> item) {
 	return sessionData(&item->history()->session());
 }
 
+void DownloadManager::writePostponed(not_null<Main::Session*> session) {
+	session->account().local().updateDownloads(serializator(session));
+}
+
+Fn<std::optional<QByteArray>()> DownloadManager::serializator(
+		not_null<Main::Session*> session) const {
+	return [this, weak = base::make_weak(session.get())]()
+		-> std::optional<QByteArray> {
+		const auto strong = weak.get();
+		if (!strong) {
+			return std::nullopt;
+		} else if (!_sessions.contains(strong)) {
+			return QByteArray();
+		}
+		auto result = QByteArray();
+		const auto &data = sessionData(strong);
+		const auto count = data.downloaded.size();
+		const auto constant = sizeof(quint64) // download.objectId
+			+ sizeof(qint32) // download.type
+			+ sizeof(qint64) // started
+			+ sizeof(qint32) // size
+			+ sizeof(quint64) // itemId.peer
+			+ sizeof(qint64) // itemId.msg
+			+ sizeof(quint64); // peerAccessHash
+		auto size = sizeof(qint32) // count
+			+ count * constant;
+		for (const auto &id : data.downloaded) {
+			size += Serialize::stringSize(id.path);
+		}
+		result.reserve(size);
+
+		auto stream = QDataStream(&result, QIODevice::WriteOnly);
+		stream.setVersion(QDataStream::Qt_5_1);
+		stream << qint32(count);
+		for (const auto &id : data.downloaded) {
+			stream
+				<< quint64(id.download.objectId)
+				<< qint32(id.download.type)
+				<< qint64(id.started)
+				<< qint32(id.size)
+				<< quint64(id.itemId.peer.value)
+				<< qint64(id.itemId.msg.bare)
+				<< quint64(id.peerAccessHash)
+				<< id.path;
+		}
+		stream.device()->close();
+
+		return result;
+	};
+}
+
+std::vector<DownloadedId> DownloadManager::deserialize(
+		not_null<Main::Session*> session) const {
+	const auto serialized = session->account().local().downloadsSerialized();
+	if (serialized.isEmpty()) {
+		return {};
+	}
+
+	QDataStream stream(serialized);
+	stream.setVersion(QDataStream::Qt_5_1);
+
+	auto count = qint32();
+	stream >> count;
+	if (stream.status() != QDataStream::Ok || count <= 0 || count > 99'999) {
+		return {};
+	}
+	auto result = std::vector<DownloadedId>();
+	result.reserve(count);
+	for (auto i = 0; i != count; ++i) {
+		auto downloadObjectId = quint64();
+		auto uncheckedDownloadType = qint32();
+		auto started = qint64();
+		auto size = qint32();
+		auto itemIdPeer = quint64();
+		auto itemIdMsg = qint64();
+		auto peerAccessHash = quint64();
+		auto path = QString();
+		stream
+			>> downloadObjectId
+			>> uncheckedDownloadType
+			>> started
+			>> size
+			>> itemIdPeer
+			>> itemIdMsg
+			>> peerAccessHash
+			>> path;
+		const auto downloadType = DownloadType(uncheckedDownloadType);
+		if (stream.status() != QDataStream::Ok
+			|| path.isEmpty()
+			|| size <= 0
+			|| size > kMaxFileSize
+			|| (downloadType != DownloadType::Document
+				&& downloadType != DownloadType::Photo)) {
+			return {};
+		}
+		result.push_back({
+			.download = {
+				.objectId = downloadObjectId,
+				.type = downloadType,
+			},
+			.started = started,
+			.path = path,
+			.size = size,
+			.itemId = { PeerId(itemIdPeer), MsgId(itemIdMsg) },
+			.peerAccessHash = peerAccessHash,
+		});
+	}
+	return result;
+}
+
 void DownloadManager::untrack(not_null<Main::Session*> session) {
 	const auto i = _sessions.find(session);
 	Assert(i != end(_sessions));
 
 	for (const auto &entry : i->second.downloaded) {
 		if (const auto resolved = entry.object.get()) {
-			if (const auto item = resolved->item) {
-				_loaded.remove(item);
+			const auto item = resolved->item;
+			_loaded.remove(item);
+			_generated.remove(item);
+			if (const auto document = resolved->document) {
+				_generatedDocuments.remove(document);
 			}
 		}
 	}

Telegram/SourceFiles/data/data_download_manager.h

@@ -20,6 +20,7 @@ class Session;
 
 namespace Data {
 
+// Used in serialization!
 enum class DownloadType {
 	Document,
 	Photo,
@@ -53,6 +54,7 @@ struct DownloadedId {
 	DownloadId download;
 	DownloadDate started = 0;
 	QString path;
+	int32 size = 0;
 	FullMsgId itemId;
 	uint64 peerAccessHash = 0;
 
@@ -88,7 +90,7 @@ public:
 	[[nodiscard]] auto loadingProgressValue() const
 		-> rpl::producer<DownloadProgress>;
 
-	[[nodiscard]] auto loadedList() const
+	[[nodiscard]] auto loadedList()
 		-> ranges::any_view<const DownloadedId*, ranges::category::input>;
 	[[nodiscard]] auto loadedAdded() const
 		-> rpl::producer<not_null<const DownloadedId*>>;
@@ -99,6 +101,9 @@ private:
 	struct SessionData {
 		std::vector<DownloadedId> downloaded;
 		std::vector<DownloadingId> downloading;
+		int resolveNeeded = 0;
+		int resolveSentRequests = 0;
+		int resolveSentTotal = 0;
 		rpl::lifetime lifetime;
 	};
 
@@ -116,18 +121,39 @@ private:
 	void clearLoading();
 
 	[[nodiscard]] int64 computeNextStarted();
-	[[nodiscard]] not_null<HistoryItem*> generateItem(
-		const DownloadObject &object);
 
 	[[nodiscard]] SessionData &sessionData(not_null<Main::Session*> session);
+	[[nodiscard]] const SessionData &sessionData(
+		not_null<Main::Session*> session) const;
 	[[nodiscard]] SessionData &sessionData(
 		not_null<const HistoryItem*> item);
 
+	void resolve(not_null<Main::Session*> session, SessionData &data);
+	void resolveRequestsFinished(
+		not_null<Main::Session*> session,
+		SessionData &data);
+	[[nodiscard]] not_null<HistoryItem*> regenerateItem(
+		const DownloadObject &previous);
+	[[nodiscard]] not_null<HistoryItem*> generateFakeItem(
+		not_null<DocumentData*> document);
+	[[nodiscard]] not_null<HistoryItem*> generateItem(
+		HistoryItem *previousItem,
+		DocumentData *document,
+		PhotoData *photo);
+	void generateEntry(not_null<Main::Session*> session, DownloadedId &id);
+
+	void writePostponed(not_null<Main::Session*> session);
+	[[nodiscard]] Fn<std::optional<QByteArray>()> serializator(
+		not_null<Main::Session*> session) const;
+	[[nodiscard]] std::vector<DownloadedId> deserialize(
+		not_null<Main::Session*> session) const;
+
 	base::flat_map<not_null<Main::Session*>, SessionData> _sessions;
 	base::flat_set<not_null<const HistoryItem*>> _loading;
 	base::flat_set<not_null<const HistoryItem*>> _loadingDone;
 	base::flat_set<not_null<const HistoryItem*>> _loaded;
 	base::flat_set<not_null<HistoryItem*>> _generated;
+	base::flat_set<not_null<DocumentData*>> _generatedDocuments;
 
 	TimeId _lastStartedBase = 0;
 	int _lastStartedAdded = 0;

Telegram/SourceFiles/storage/storage_account.cpp

@@ -286,6 +286,7 @@ Account::ReadMapResult Account::readMapWith(
 	quint64 savedGifsKey = 0;
 	quint64 legacyBackgroundKeyDay = 0, legacyBackgroundKeyNight = 0;
 	quint64 userSettingsKey = 0, recentHashtagsAndBotsKey = 0, exportSettingsKey = 0;
+	quint64 downloadsKey = 0;
 	while (!map.stream.atEnd()) {
 		quint32 keyType;
 		map.stream >> keyType;
@@ -598,6 +599,8 @@ void Account::reset() {
 	_fileLocations.clear();
 	_fileLocationPairs.clear();
 	_fileLocationAliases.clear();
+	_downloadsSerialize = nullptr;
+	_downloadsSerialized = QByteArray();
 	_cacheTotalSizeLimit = Database::Settings().totalSizeLimit;
 	_cacheTotalTimeLimit = Database::Settings().totalTimeLimit;
 	_cacheBigFileTotalSizeLimit = Database::Settings().totalSizeLimit;
@@ -629,7 +632,12 @@ void Account::writeLocations() {
 	}
 	_locationsChanged = false;
 
-	if (_fileLocations.isEmpty()) {
+	if (_downloadsSerialize) {
+		if (auto serialized = _downloadsSerialize()) {
+			_downloadsSerialized = std::move(*serialized);
+		}
+	}
+	if (_fileLocations.isEmpty() && _downloadsSerialized.isEmpty()) {
 		if (_locationsKey) {
 			ClearKey(_locationsKey, _basePath);
 			_locationsKey = 0;
@@ -665,6 +673,9 @@ void Account::writeLocations() {
 			size += sizeof(quint64) * 2 + sizeof(quint64) * 2;
 		}
 
+		size += sizeof(quint32); // legacy webLocationsCount
+		size += Serialize::bytearraySize(_downloadsSerialized);
+
 		EncryptedDescriptor data(size);
 		auto legacyTypeField = 0;
 		for (auto i = _fileLocations.cbegin(); i != _fileLocations.cend(); ++i) {
@@ -686,6 +697,8 @@ void Account::writeLocations() {
 			data.stream << quint64(i.key().first) << quint64(i.key().second) << quint64(i.value().first) << quint64(i.value().second);
 		}
 
+		data.stream << quint32(0) << _downloadsSerialized;
+
 		FileWriteDescriptor file(_locationsKey, _basePath);
 		file.writeEncrypted(data, _localKey);
 	}
@@ -757,10 +770,24 @@ void Account::readLocations() {
 				locations.stream >> url >> key >> size;
 				ClearKey(key, _basePath);
 			}
+
+			if (!locations.stream.atEnd()) {
+				locations.stream >> _downloadsSerialized;
+			}
 		}
 	}
 }
 
+void Account::updateDownloads(
+		Fn<std::optional<QByteArray>()> downloadsSerialize) {
+	_downloadsSerialize = std::move(downloadsSerialize);
+	writeLocationsDelayed();
+}
+
+QByteArray Account::downloadsSerialized() const {
+	return _downloadsSerialized;
+}
+
 void Account::writeSessionSettings() {
 	writeSessionSettings(nullptr);
 }

Telegram/SourceFiles/storage/storage_account.h

@@ -97,10 +97,15 @@ public:
 	[[nodiscard]] bool hasDraftCursors(PeerId peerId);
 	[[nodiscard]] bool hasDraft(PeerId peerId);
 
-	void writeFileLocation(MediaKey location, const Core::FileLocation &local);
+	void writeFileLocation(
+		MediaKey location,
+		const Core::FileLocation &local);
 	[[nodiscard]] Core::FileLocation readFileLocation(MediaKey location);
 	void removeFileLocation(MediaKey location);
 
+	void updateDownloads(Fn<std::optional<QByteArray>()> downloadsSerialize);
+	[[nodiscard]] QByteArray downloadsSerialized() const;
+
 	[[nodiscard]] EncryptionKey cacheKey() const;
 	[[nodiscard]] QString cachePath() const;
 	[[nodiscard]] Cache::Database::Settings cacheSettings() const;
@@ -256,6 +261,9 @@ private:
 	QMap<QString, QPair<MediaKey, Core::FileLocation>> _fileLocationPairs;
 	QMap<MediaKey, MediaKey> _fileLocationAliases;
 
+	QByteArray _downloadsSerialized;
+	Fn<std::optional<QByteArray>()> _downloadsSerialize;
+
 	FileKey _locationsKey = 0;
 	FileKey _trustedBotsKey = 0;
 	FileKey _installedStickersKey = 0;