Display errors in export UI.

All errors are now fatal errors :(

Telegram/Resources/langs/lang.strings

@@ -1654,7 +1654,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_passport_bad_name" = "Please use latin characters only.";
 
 "lng_export_title" = "Personal data export";
-"lng_export_option_info" = "Personal info";
+"lng_export_option_info" = "Personal information";
 "lng_export_option_contacts" = "Contacts list";
 "lng_export_option_sessions" = "Sessions list";
 "lng_export_header_chats" = "Chats export settings";
@@ -1675,6 +1675,17 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_export_option_files" = "Files";
 "lng_export_option_size_limit" = "Size limit: {size}";
 "lng_export_start" = "Export";
+"lng_export_state_initializing" = "Initializing...";
+"lng_export_state_userpics" = "Personal photos";
+"lng_export_state_chats_list" = "Processing chats...";
+"lng_export_state_chats" = "Chats";
+"lng_export_state_progress" = "{count} / {total}";
+"lng_export_state_photo" = "Photo";
+"lng_export_state_video_file" = "Video file";
+"lng_export_state_voice_message" = "Voice message";
+"lng_export_state_video_message" = "Round video message";
+"lng_export_state_sticker" = "Sticker";
+"lng_export_state_gif" = "Animated GIF";
 
 // Wnd specific
 

Telegram/SourceFiles/export/data/export_data_types.cpp

@@ -250,6 +250,21 @@ QString CleanDocumentName(QString name) {
 	return name;
 }
 
+QString DocumentFolder(const Document &data) {
+	if (data.isVideoFile) {
+		return "VideoFiles";
+	} else if (data.isAnimated) {
+		return "AnimatedGIFs";
+	} else if (data.isSticker) {
+		return "Stickers";
+	} else if (data.isVoiceMessage) {
+		return "VoiceMessages";
+	} else if (data.isVideoMessage) {
+		return "RoundVideoMessages";
+	}
+	return "Files";
+}
+
 Document ParseDocument(
 		const MTPDocument &data,
 		const QString &suggestedFolder,
@@ -267,6 +282,7 @@ Document ParseDocument(
 		result.mime = ParseString(data.vmime_type);
 		ParseAttributes(result, data.vattributes);
 		result.file.suggestedPath = suggestedFolder
+			+ DocumentFolder(result) + '/'
 			+ CleanDocumentName(
 				ComputeDocumentName(result, date ? date : result.date));
 	}, [&](const MTPDdocumentEmpty &data) {
@@ -548,10 +564,7 @@ Media ParseMedia(
 		result.content = UnsupportedMedia();
 	}, [&](const MTPDmessageMediaDocument &data) {
 		result.content = data.has_document()
-			? ParseDocument(
+			? ParseDocument(data.vdocument, folder, date)
-				data.vdocument,
-				folder + "Files/",
-				date)
 			: Document();
 		if (data.has_ttl_seconds()) {
 			result.ttl = data.vttl_seconds.v;

Telegram/SourceFiles/export/data/export_data_types.h

@@ -427,6 +427,9 @@ struct DialogInfo {
 	bool onlyMyMessages = false;
 	QString relativePath;
 
+	// Filled when requesting dialog messages.
+	int messagesCount = 0;
+
 };
 
 struct DialogsInfo {

Telegram/SourceFiles/export/export_api_wrap.cpp

@@ -9,6 +9,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "export/export_settings.h"
 #include "export/data/export_data_types.h"
+#include "export/output/export_output_result.h"
 #include "export/output/export_output_file.h"
 #include "mtproto/rpc_sender.h"
 #include "base/value_ordering.h"
@@ -114,11 +115,13 @@ struct ApiWrap::StartProcess {
 };
 
 struct ApiWrap::UserpicsProcess {
-	FnMut<void(Data::UserpicsInfo&&)> start;
+	FnMut<bool(Data::UserpicsInfo&&)> start;
-	Fn<void(Data::UserpicsSlice&&)> handleSlice;
+	Fn<bool(DownloadProgress)> fileProgress;
+	Fn<bool(Data::UserpicsSlice&&)> handleSlice;
 	FnMut<void()> finish;
 
 	base::optional<Data::UserpicsSlice> slice;
+	uint64 maxId = 0;
 	bool lastSlice = false;
 	int fileIndex = -1;
 
@@ -130,6 +133,7 @@ struct ApiWrap::FileProcess {
 	Output::File file;
 	QString relativePath;
 
+	Fn<bool(FileProgress)> progress;
 	FnMut<void(const QString &relativePath)> done;
 
 	Data::FileLocation location;
@@ -144,18 +148,25 @@ struct ApiWrap::FileProcess {
 
 };
 
+struct ApiWrap::FileProgress {
+	int ready = 0;
+	int total = 0;
+};
+
 struct ApiWrap::LeftChannelsProcess {
+	Fn<bool(int count)> progress;
 	FnMut<void(Data::DialogsInfo&&)> done;
 
 	Data::DialogsInfo info;
 
-	rpl::variable<int> count;
 	int fullCount = 0;
+	int offset = 0;
 	bool finished = false;
 
 };
 
 struct ApiWrap::DialogsProcess {
+	Fn<bool(int count)> progress;
 	FnMut<void(Data::DialogsInfo&&)> done;
 
 	Data::DialogsInfo info;
@@ -164,14 +175,14 @@ struct ApiWrap::DialogsProcess {
 	int32 offsetId = 0;
 	MTPInputPeer offsetPeer = MTP_inputPeerEmpty();
 
-	rpl::variable<int> count;
-
 };
 
 struct ApiWrap::ChatProcess {
 	Data::DialogInfo info;
 
-	Fn<void(Data::MessagesSlice&&)> handleSlice;
+	FnMut<bool(const Data::DialogInfo &)> start;
+	Fn<bool(DownloadProgress)> fileProgress;
+	Fn<bool(Data::MessagesSlice&&)> handleSlice;
 	FnMut<void()> done;
 
 	int32 offsetId = 1;
@@ -247,6 +258,10 @@ rpl::producer<RPCError> ApiWrap::errors() const {
 	return _errors.events();
 }
 
+rpl::producer<Output::Result> ApiWrap::ioErrors() const {
+	return _ioErrors.events();
+}
+
 void ApiWrap::startExport(
 		const Settings &settings,
 		FnMut<void(StartInfo)> done) {
@@ -260,9 +275,11 @@ void ApiWrap::startExport(
 	using Step = StartProcess::Step;
 	if (_settings->types & Settings::Type::Userpics) {
 		_startProcess->steps.push_back(Step::UserpicsCount);
-	} else if (_settings->types & Settings::Type::AnyChatsMask) {
+	}
+	if (_settings->types & Settings::Type::AnyChatsMask) {
 		_startProcess->steps.push_back(Step::DialogsCount);
-	} else if (_settings->types & Settings::Type::GroupsChannelsMask) {
+	}
+	if (_settings->types & Settings::Type::GroupsChannelsMask) {
 		_startProcess->steps.push_back(Step::LeftChannelsCount);
 	}
 	startMainSession([=] {
@@ -361,9 +378,11 @@ void ApiWrap::finishStartProcess() {
 }
 
 void ApiWrap::requestLeftChannelsList(
+		Fn<bool(int count)> progress,
 		FnMut<void(Data::DialogsInfo&&)> done) {
 	Expects(_leftChannelsProcess != nullptr);
 
+	_leftChannelsProcess->progress = std::move(progress);
 	_leftChannelsProcess->done = std::move(done);
 	requestLeftChannelsSlice();
 }
@@ -382,27 +401,18 @@ void ApiWrap::requestLeftChannelsSlice() {
 	});
 }
 
-rpl::producer<int> ApiWrap::leftChannelsLoadedCount() const {
+void ApiWrap::requestDialogsList(
-	Expects(_leftChannelsProcess != nullptr);
+		Fn<bool(int count)> progress,
-
+		FnMut<void(Data::DialogsInfo&&)> done) {
-	return _leftChannelsProcess->count.value();
-}
-
-void ApiWrap::requestDialogsList(FnMut<void(Data::DialogsInfo&&)> done) {
 	Expects(_dialogsProcess == nullptr);
 
 	_dialogsProcess = std::make_unique<DialogsProcess>();
+	_dialogsProcess->progress = std::move(progress);
 	_dialogsProcess->done = std::move(done);
 
 	requestDialogsSlice();
 }
 
-rpl::producer<int> ApiWrap::dialogsLoadedCount() const {
-	Expects(_dialogsProcess != nullptr);
-
-	return _dialogsProcess->count.value();
-}
-
 void ApiWrap::startMainSession(FnMut<void()> done) {
 	const auto sizeLimit = _settings->media.sizeLimit;
 	const auto hasFiles = (_settings->media.types != 0) && (sizeLimit > 0);
@@ -456,33 +466,35 @@ void ApiWrap::requestPersonalInfo(FnMut<void(Data::PersonalInfo&&)> done) {
 }
 
 void ApiWrap::requestUserpics(
-		FnMut<void(Data::UserpicsInfo&&)> start,
+		FnMut<bool(Data::UserpicsInfo&&)> start,
-		Fn<void(Data::UserpicsSlice&&)> slice,
+		Fn<bool(DownloadProgress)> progress,
+		Fn<bool(Data::UserpicsSlice&&)> slice,
 		FnMut<void()> finish) {
 	Expects(_userpicsProcess == nullptr);
 
 	_userpicsProcess = std::make_unique<UserpicsProcess>();
 	_userpicsProcess->start = std::move(start);
+	_userpicsProcess->fileProgress = std::move(progress);
 	_userpicsProcess->handleSlice = std::move(slice);
 	_userpicsProcess->finish = std::move(finish);
 
 	mainRequest(MTPphotos_GetUserPhotos(
 		_user,
-		MTP_int(0),  // offset
+		MTP_int(0), // offset
-		MTP_long(0), // max_id
+		MTP_long(_userpicsProcess->maxId),
 		MTP_int(kUserpicsSliceLimit)
 	)).done([=](const MTPphotos_Photos &result) mutable {
 		Expects(_userpicsProcess != nullptr);
 
-		_userpicsProcess->start([&] {
+		auto startInfo = result.match(
-			auto info = Data::UserpicsInfo();
+		[](const MTPDphotos_photos &data) {
-			result.match([&](const MTPDphotos_photos &data) {
+			return Data::UserpicsInfo{ data.vphotos.v.size() };
-				info.count = data.vphotos.v.size();
+		}, [](const MTPDphotos_photosSlice &data) {
-			}, [&](const MTPDphotos_photosSlice &data) {
+			return Data::UserpicsInfo{ data.vcount.v };
-				info.count = data.vcount.v;
+		});
-			});
+		if (!_userpicsProcess->start(std::move(startInfo))) {
-			return info;
+			return;
-		}());
+		}
 
 		handleUserpicsSlice(result);
 	}).send();
@@ -523,34 +535,54 @@ void ApiWrap::loadNextUserpic() {
 		}
 		const auto ready = processFileLoad(
 			list[index].image.file,
+			[=](FileProgress value) { return loadUserpicProgress(value); },
 			[=](const QString &path) { loadUserpicDone(path); });
 		if (!ready) {
 			return;
 		}
 	}
-	const auto lastUserpicId = list.empty()
+	finishUserpicsSlice();
-		? base::none
+}
-		: base::make_optional(list.back().id);
 
-	if (!list.empty()) {
+void ApiWrap::finishUserpicsSlice() {
-		_userpicsProcess->handleSlice(*base::take(_userpicsProcess->slice));
+	Expects(_userpicsProcess != nullptr);
+	Expects(_userpicsProcess->slice.has_value());
+
+	auto slice = *base::take(_userpicsProcess->slice);
+	if (!slice.list.empty()) {
+		_userpicsProcess->maxId = slice.list.back().id;
+		if (!_userpicsProcess->handleSlice(std::move(slice))) {
+			return;
+		}
 	}
 	if (_userpicsProcess->lastSlice) {
 		finishUserpics();
 		return;
 	}
 
-	Assert(lastUserpicId.has_value());
 	mainRequest(MTPphotos_GetUserPhotos(
 		_user,
-		MTP_int(0),
+		MTP_int(0), // offset
-		MTP_long(*lastUserpicId),
+		MTP_long(_userpicsProcess->maxId),
 		MTP_int(kUserpicsSliceLimit)
 	)).done([=](const MTPphotos_Photos &result) {
 		handleUserpicsSlice(result);
 	}).send();
 }
 
+bool ApiWrap::loadUserpicProgress(FileProgress progress) {
+	Expects(_userpicsProcess != nullptr);
+	Expects(_userpicsProcess->slice.has_value());
+	Expects((_userpicsProcess->fileIndex >= 0)
+		&& (_userpicsProcess->fileIndex
+			< _userpicsProcess->slice->list.size()));
+
+	return _userpicsProcess->fileProgress(DownloadProgress{
+		_userpicsProcess->fileIndex,
+		progress.ready,
+		progress.total });
+}
+
 void ApiWrap::loadUserpicDone(const QString &relativePath) {
 	Expects(_userpicsProcess != nullptr);
 	Expects(_userpicsProcess->slice.has_value());
@@ -588,16 +620,25 @@ void ApiWrap::requestSessions(FnMut<void(Data::SessionsList&&)> done) {
 
 void ApiWrap::requestMessages(
 		const Data::DialogInfo &info,
-		Fn<void(Data::MessagesSlice&&)> slice,
+		FnMut<bool(const Data::DialogInfo &)> start,
+		Fn<bool(DownloadProgress)> progress,
+		Fn<bool(Data::MessagesSlice&&)> slice,
 		FnMut<void()> done) {
 	Expects(_chatProcess == nullptr);
 
 	_chatProcess = std::make_unique<ChatProcess>();
 	_chatProcess->info = info;
+	_chatProcess->start = std::move(start);
+	_chatProcess->fileProgress = std::move(progress);
 	_chatProcess->handleSlice = std::move(slice);
 	_chatProcess->done = std::move(done);
 
-	requestMessagesSlice();
+	requestMessagesSlice([=](int count) {
+		Expects(_chatProcess != nullptr);
+
+		_chatProcess->info.messagesCount = count;
+		return _chatProcess->start(_chatProcess->info);
+	});
 }
 
 void ApiWrap::requestDialogsSlice() {
@@ -628,6 +669,11 @@ void ApiWrap::requestDialogsSlice() {
 
 			appendDialogsSlice(std::move(info));
 
+			const auto count = _dialogsProcess->info.list.size();
+			if (!_dialogsProcess->progress(count)) {
+				return;
+			}
+
 			requestDialogsSlice();
 		}
 	}).send();
@@ -654,7 +700,7 @@ void ApiWrap::requestLeftChannelsSliceGeneric(FnMut<void()> done) {
 	Expects(_leftChannelsProcess != nullptr);
 
 	mainRequest(MTPchannels_GetLeftChannels(
-		MTP_int(_leftChannelsProcess->info.list.size())
+		MTP_int(_leftChannelsProcess->offset)
 	)).done([=, done = std::move(done)](
 			const MTPmessages_Chats &result) mutable {
 		Expects(_leftChannelsProcess != nullptr);
@@ -662,6 +708,11 @@ void ApiWrap::requestLeftChannelsSliceGeneric(FnMut<void()> done) {
 		appendLeftChannelsSlice(Data::ParseLeftChannelsInfo(result));
 
 		const auto process = _leftChannelsProcess.get();
+		process->offset += result.match(
+		[](const auto &data) {
+			return int(data.vchats.v.size());
+		});
+
 		process->fullCount = result.match(
 		[](const MTPDmessages_chats &data) {
 			return int(data.vchats.v.size());
@@ -676,7 +727,11 @@ void ApiWrap::requestLeftChannelsSliceGeneric(FnMut<void()> done) {
 			return data.vchats.v.isEmpty();
 		});
 
-		process->count = process->info.list.size();
+		if (process->progress) {
+			if (!process->progress(process->info.list.size())) {
+				return;
+			}
+		}
 
 		done();
 	}).send();
@@ -710,23 +765,30 @@ void ApiWrap::appendChatsSlice(
 	}
 }
 
-void ApiWrap::requestMessagesSlice() {
+void ApiWrap::requestMessagesSlice(FnMut<bool(int count)> start) {
 	Expects(_chatProcess != nullptr);
 
-	// #TODO export
+	auto handleResult = [=, start = std::move(start)](
-	if (_chatProcess->info.input.match([](const MTPDinputPeerUser &value) {
+			const MTPmessages_Messages &result) mutable {
-		return !value.vaccess_hash.v;
-	}, [](const auto &data) { return false; })) {
-		finishMessages();
-		return;
-	}
-
-	auto handleResult = [=](const MTPmessages_Messages &result) mutable {
 		Expects(_chatProcess != nullptr);
 
+		const auto count = result.match(
+		[](const MTPDmessages_messages &data) {
+			return data.vmessages.v.size();
+		}, [](const MTPDmessages_messagesSlice &data) {
+			return data.vcount.v;
+		}, [](const MTPDmessages_channelMessages &data) {
+			return data.vcount.v;
+		}, [](const MTPDmessages_messagesNotModified &data) {
+			return 0;
+		});
+
 		result.match([&](const MTPDmessages_messagesNotModified &data) {
 			error("Unexpected messagesNotModified received.");
 		}, [&](const auto &data) {
+			if (start && !start(count)) {
+				return;
+			}
 			if constexpr (MTPDmessages_messages::Is<decltype(data)>()) {
 				_chatProcess->lastSlice = true;
 			}
@@ -790,8 +852,12 @@ void ApiWrap::loadNextMessageFile() {
 		if (index >= list.size()) {
 			break;
 		}
+		const auto fileProgress = [=](FileProgress value) {
+			return loadMessageFileProgress(value);
+		};
 		const auto ready = processFileLoad(
 			list[index].file(),
+			fileProgress,
 			[=](const QString &path) { loadMessageFileDone(path); },
 			&list[index]);
 		if (!ready) {
@@ -808,7 +874,9 @@ void ApiWrap::finishMessagesSlice() {
 	auto slice = *base::take(_chatProcess->slice);
 	if (!slice.list.empty()) {
 		_chatProcess->offsetId = slice.list.back().id + 1;
-		_chatProcess->handleSlice(std::move(slice));
+		if (!_chatProcess->handleSlice(std::move(slice))) {
+			return;
+		}
 	}
 	if (_chatProcess->lastSlice) {
 		finishMessages();
@@ -817,6 +885,18 @@ void ApiWrap::finishMessagesSlice() {
 	}
 }
 
+bool ApiWrap::loadMessageFileProgress(FileProgress progress) {
+	Expects(_chatProcess != nullptr);
+	Expects(_chatProcess->slice.has_value());
+	Expects((_chatProcess->fileIndex >= 0)
+		&& (_chatProcess->fileIndex < _chatProcess->slice->list.size()));
+
+	return _chatProcess->fileProgress(DownloadProgress{
+		_chatProcess->fileIndex,
+		progress.ready,
+		progress.total });
+}
+
 void ApiWrap::loadMessageFileDone(const QString &relativePath) {
 	Expects(_chatProcess != nullptr);
 	Expects(_chatProcess->slice.has_value());
@@ -838,6 +918,7 @@ void ApiWrap::finishMessages() {
 
 bool ApiWrap::processFileLoad(
 		Data::File &file,
+		Fn<bool(FileProgress)> progress,
 		FnMut<void(QString)> done,
 		Data::Message *message) {
 	using SkipReason = Data::File::SkipReason;
@@ -848,7 +929,7 @@ bool ApiWrap::processFileLoad(
 		file.skipReason = SkipReason::Unavailable;
 		return true;
 	} else if (writePreloadedFile(file)) {
-		return true;
+		return !file.relativePath.isEmpty();
 	}
 
 	using Type = MediaSettings::Type;
@@ -878,7 +959,7 @@ bool ApiWrap::processFileLoad(
 		file.skipReason = SkipReason::FileSize;
 		return true;
 	}
-	loadFile(file, std::move(done));
+	loadFile(file, std::move(progress), std::move(done));
 	return false;
 }
 
@@ -893,25 +974,39 @@ bool ApiWrap::writePreloadedFile(Data::File &file) {
 	} else if (!file.content.isEmpty()) {
 		const auto process = prepareFileProcess(file);
 		auto &output = _fileProcess->file;
-		if (output.writeBlock(file.content) == File::Result::Success) {
+		if (const auto result = output.writeBlock(file.content)) {
 			file.relativePath = process->relativePath;
 			_fileCache->save(file.location, file.relativePath);
-			return true;
+		} else {
+			ioError(result);
 		}
-		error(QString("Could not write '%1'.").arg(process->relativePath));
+		return true;
 	}
 	return false;
 }
 
 void ApiWrap::loadFile(
 		const Data::File &file,
+		Fn<bool(FileProgress)> progress,
 		FnMut<void(QString)> done) {
 	Expects(_fileProcess == nullptr);
 	Expects(file.location.dcId != 0);
 
 	_fileProcess = prepareFileProcess(file);
+	_fileProcess->progress = std::move(progress);
 	_fileProcess->done = std::move(done);
 
+
+	if (_fileProcess->progress) {
+		const auto progress = FileProgress{
+			_fileProcess->file.size(),
+			_fileProcess->size
+		};
+		if (!_fileProcess->progress(progress)) {
+			return;
+		}
+	}
+
 	loadFilePart();
 }
 
@@ -989,14 +1084,19 @@ void ApiWrap::filePartDone(int offset, const MTPupload_File &result) {
 		auto &file = _fileProcess->file;
 		while (!requests.empty() && !requests.front().bytes.isEmpty()) {
 			const auto &bytes = requests.front().bytes;
-			if (file.writeBlock(bytes) != Output::File::Result::Success) {
+			if (const auto result = file.writeBlock(bytes); !result) {
-				error(QString("Could not write bytes to '%1'."
+				ioError(result);
-				).arg(_fileProcess->relativePath));
 				return;
 			}
 			requests.pop_front();
 		}
 
+		if (_fileProcess->progress) {
+			_fileProcess->progress(FileProgress{
+				file.size(),
+				_fileProcess->size });
+		}
+
 		if (!requests.empty()
 			|| !_fileProcess->size
 			|| _fileProcess->size > _fileProcess->offset) {
@@ -1019,6 +1119,10 @@ void ApiWrap::error(const QString &text) {
 	error(MTP_rpc_error(MTP_int(0), MTP_string("API_ERROR: " + text)));
 }
 
+void ApiWrap::ioError(const Output::Result &result) {
+	_ioErrors.fire_copy(result);
+}
+
 ApiWrap::~ApiWrap() = default;
 
 } // namespace Export

Telegram/SourceFiles/export/export_api_wrap.h

@@ -25,6 +25,10 @@ struct MessagesSlice;
 struct Message;
 } // namespace Data
 
+namespace Output {
+struct Result;
+} // namespace Output
+
 struct Settings;
 
 class ApiWrap {
@@ -32,6 +36,7 @@ public:
 	ApiWrap(Fn<void(FnMut<void()>)> runner);
 
 	rpl::producer<RPCError> errors() const;
+	rpl::producer<Output::Result> ioErrors() const;
 
 	struct StartInfo {
 		int userpicsCount = 0;
@@ -42,17 +47,24 @@ public:
 		const Settings &settings,
 		FnMut<void(StartInfo)> done);
 
-	void requestLeftChannelsList(FnMut<void(Data::DialogsInfo&&)> done);
+	void requestLeftChannelsList(
-	rpl::producer<int> leftChannelsLoadedCount() const;
+		Fn<bool(int count)> progress,
-
+		FnMut<void(Data::DialogsInfo&&)> done);
-	void requestDialogsList(FnMut<void(Data::DialogsInfo&&)> done);
+	void requestDialogsList(
-	rpl::producer<int> dialogsLoadedCount() const;
+		Fn<bool(int count)> progress,
+		FnMut<void(Data::DialogsInfo&&)> done);
 
 	void requestPersonalInfo(FnMut<void(Data::PersonalInfo&&)> done);
 
+	struct DownloadProgress {
+		int itemIndex = 0;
+		int ready = 0;
+		int total = 0;
+	};
 	void requestUserpics(
-		FnMut<void(Data::UserpicsInfo&&)> start,
+		FnMut<bool(Data::UserpicsInfo&&)> start,
-		Fn<void(Data::UserpicsSlice&&)> slice,
+		Fn<bool(DownloadProgress)> progress,
+		Fn<bool(Data::UserpicsSlice&&)> slice,
 		FnMut<void()> finish);
 
 	void requestContacts(FnMut<void(Data::ContactsList&&)> done);
@@ -61,7 +73,9 @@ public:
 
 	void requestMessages(
 		const Data::DialogInfo &info,
-		Fn<void(Data::MessagesSlice&&)> slice,
+		FnMut<bool(const Data::DialogInfo &)> start,
+		Fn<bool(DownloadProgress)> progress,
+		Fn<bool(Data::MessagesSlice&&)> slice,
 		FnMut<void()> done);
 
 	~ApiWrap();
@@ -71,6 +85,7 @@ private:
 	struct StartProcess;
 	struct UserpicsProcess;
 	struct FileProcess;
+	struct FileProgress;
 	struct LeftChannelsProcess;
 	struct DialogsProcess;
 	struct ChatProcess;
@@ -85,7 +100,9 @@ private:
 	void handleUserpicsSlice(const MTPphotos_Photos &result);
 	void loadUserpicsFiles(Data::UserpicsSlice &&slice);
 	void loadNextUserpic();
+	bool loadUserpicProgress(FileProgress value);
 	void loadUserpicDone(const QString &relativePath);
+	void finishUserpicsSlice();
 	void finishUserpics();
 
 	void requestDialogsSlice();
@@ -98,15 +115,17 @@ private:
 
 	void appendChatsSlice(Data::DialogsInfo &to, Data::DialogsInfo &&info);
 
-	void requestMessagesSlice();
+	void requestMessagesSlice(FnMut<bool(int count)> start = nullptr);
 	void loadMessagesFiles(Data::MessagesSlice &&slice);
 	void loadNextMessageFile();
+	bool loadMessageFileProgress(FileProgress value);
 	void loadMessageFileDone(const QString &relativePath);
 	void finishMessagesSlice();
 	void finishMessages();
 
 	bool processFileLoad(
 		Data::File &file,
+		Fn<bool(FileProgress)> progress,
 		FnMut<void(QString)> done,
 		Data::Message *message = nullptr);
 	std::unique_ptr<FileProcess> prepareFileProcess(
@@ -114,6 +133,7 @@ private:
 	bool writePreloadedFile(Data::File &file);
 	void loadFile(
 		const Data::File &file,
+		Fn<bool(FileProgress)> progress,
 		FnMut<void(QString)> done);
 	void loadFilePart();
 	void filePartDone(int offset, const MTPupload_File &result);
@@ -127,6 +147,7 @@ private:
 
 	void error(RPCError &&error);
 	void error(const QString &text);
+	void ioError(const Output::Result &result);
 
 	MTP::ConcurrentSender _mtp;
 	base::optional<uint64> _takeoutId;
@@ -143,6 +164,7 @@ private:
 	std::unique_ptr<ChatProcess> _chatProcess;
 
 	rpl::event_stream<RPCError> _errors;
+	rpl::event_stream<Output::Result> _ioErrors;
 
 };
 

Telegram/SourceFiles/export/export_controller.cpp

@@ -11,6 +11,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "export/export_settings.h"
 #include "export/data/export_data_types.h"
 #include "export/output/export_output_abstract.h"
+#include "export/output/export_output_result.h"
 
 namespace Export {
 
@@ -34,9 +35,11 @@ public:
 
 private:
 	using Step = ProcessingState::Step;
+	using DownloadProgress = ApiWrap::DownloadProgress;
 
 	void setState(State &&state);
 	void ioError(const QString &path);
+	bool ioCatchError(Output::Result result);
 	void setFinishedState();
 
 	//void requestPasswordState();
@@ -65,11 +68,11 @@ private:
 	ProcessingState stateLeftChannelsList(int processed) const;
 	ProcessingState stateDialogsList(int processed) const;
 	ProcessingState statePersonalInfo() const;
-	ProcessingState stateUserpics() const;
+	ProcessingState stateUserpics(DownloadProgress progress) const;
 	ProcessingState stateContacts() const;
 	ProcessingState stateSessions() const;
-	ProcessingState stateLeftChannels() const;
+	ProcessingState stateLeftChannels(DownloadProgress progress) const;
-	ProcessingState stateDialogs() const;
+	ProcessingState stateDialogs(DownloadProgress progress) const;
 
 	int substepsInStep(Step step) const;
 
@@ -77,15 +80,23 @@ private:
 
 	ApiWrap _api;
 	Settings _settings;
+
 	Data::DialogsInfo _leftChannelsInfo;
-	Data::DialogsInfo _dialogsInfo;
 	int _leftChannelIndex = -1;
+
+	Data::DialogsInfo _dialogsInfo;
 	int _dialogIndex = -1;
 
+	int _messagesWritten = 0;
+	int _messagesCount = 0;
+
+	int _userpicsWritten = 0;
+	int _userpicsCount = 0;
+
 	// rpl::variable<State> fails to compile in MSVC :(
 	State _state;
 	rpl::event_stream<State> _stateChanges;
-	std::vector<int> _substepsInStep;
+	std::shared_ptr<const std::vector<int>> _substepsInStep;
 
 	std::unique_ptr<Output::AbstractWriter> _writer;
 	std::vector<Step> _steps;
@@ -100,7 +111,12 @@ Controller::Controller(crl::weak_on_queue<Controller> weak)
 , _state(PasswordCheckState{}) {
 	_api.errors(
 	) | rpl::start_with_next([=](RPCError &&error) {
-		setState(ErrorState{ ErrorState::Type::API, std::move(error) });
+		setState(ApiErrorState{ std::move(error) });
+	}, _lifetime);
+
+	_api.ioErrors(
+	) | rpl::start_with_next([=](const Output::Result &result) {
+		ioCatchError(result);
 	}, _lifetime);
 
 	//requestPasswordState();
@@ -127,7 +143,15 @@ void Controller::setState(State &&state) {
 }
 
 void Controller::ioError(const QString &path) {
-	setState(ErrorState{ ErrorState::Type::IO, base::none, path });
+	setState(OutputErrorState{ path });
+}
+
+bool Controller::ioCatchError(Output::Result result) {
+	if (!result) {
+		ioError(result.path);
+		return true;
+	}
+	return false;
 }
 
 //void Controller::submitPassword(const QString &password) {
@@ -223,7 +247,7 @@ void Controller::fillExportSteps() {
 	using Type = Settings::Type;
 	_steps.push_back(Step::Initializing);
 	if (_settings.types & Type::GroupsChannelsMask) {
-		_steps.push_back(Step::LeftChannels);
+		_steps.push_back(Step::LeftChannelsList);
 	}
 	if (_settings.types & Type::AnyChatsMask) {
 		_steps.push_back(Step::DialogsList);
@@ -243,15 +267,19 @@ void Controller::fillExportSteps() {
 	if (_settings.types & Type::AnyChatsMask) {
 		_steps.push_back(Step::Dialogs);
 	}
+	if (_settings.types & Type::GroupsChannelsMask) {
+		_steps.push_back(Step::LeftChannels);
+	}
 }
 
 void Controller::fillSubstepsInSteps(const ApiWrap::StartInfo &info) {
+	auto result = std::vector<int>();
 	const auto push = [&](Step step, int count) {
 		const auto index = static_cast<int>(step);
-		if (index >= _substepsInStep.size()) {
+		if (index >= result.size()) {
-			_substepsInStep.resize(index + 1, 0);
+			result.resize(index + 1, 0);
 		}
-		_substepsInStep[index] = count;
+		result[index] = count;
 	};
 	push(Step::Initializing, 1);
 	if (_settings.types & Settings::Type::GroupsChannelsMask) {
@@ -278,14 +306,20 @@ void Controller::fillSubstepsInSteps(const ApiWrap::StartInfo &info) {
 	if (_settings.types & Settings::Type::AnyChatsMask) {
 		push(Step::Dialogs, info.dialogsCount);
 	}
+	_substepsInStep = std::make_shared<const std::vector<int>>(
+		std::move(result));
 }
 
 void Controller::exportNext() {
 	if (!++_stepIndex) {
-		_writer->start(_settings);
+		if (ioCatchError(_writer->start(_settings))) {
+			return;
+		}
 	}
 	if (_stepIndex >= _steps.size()) {
-		_writer->finish();
+		if (ioCatchError(_writer->finish())) {
+			return;
+		}
 		setFinishedState();
 		return;
 	}
@@ -314,63 +348,82 @@ void Controller::initialize() {
 }
 
 void Controller::collectLeftChannels() {
-	_api.requestLeftChannelsList([=](Data::DialogsInfo &&result) {
+	_api.requestLeftChannelsList([=](int count) {
+		setState(stateLeftChannelsList(count));
+		return true;
+	}, [=](Data::DialogsInfo &&result) {
 		_leftChannelsInfo = std::move(result);
 		exportNext();
 	});
-
-	_api.leftChannelsLoadedCount(
-	) | rpl::start_with_next([=](int count) {
-		setState(stateLeftChannelsList(count));
-	}, _lifetime);
 }
 
 void Controller::collectDialogsList() {
-	_api.requestDialogsList([=](Data::DialogsInfo &&result) {
+	_api.requestDialogsList([=](int count) {
+		setState(stateDialogsList(count));
+		return true;
+	}, [=](Data::DialogsInfo &&result) {
 		_dialogsInfo = std::move(result);
 		exportNext();
 	});
-
-	_api.dialogsLoadedCount(
-	) | rpl::start_with_next([=](int count) {
-		setState(stateDialogsList(count));
-	}, _lifetime);
 }
 
 void Controller::exportPersonalInfo() {
 	_api.requestPersonalInfo([=](Data::PersonalInfo &&result) {
-		_writer->writePersonal(result);
+		if (ioCatchError(_writer->writePersonal(result))) {
+			return;
+		}
 		exportNext();
 	});
 }
 
 void Controller::exportUserpics() {
 	_api.requestUserpics([=](Data::UserpicsInfo &&start) {
-		_writer->writeUserpicsStart(start);
+		if (ioCatchError(_writer->writeUserpicsStart(start))) {
+			return false;
+		}
+		_userpicsWritten = 0;
+		_userpicsCount = start.count;
+		return true;
+	}, [=](DownloadProgress progress) {
+		setState(stateUserpics(progress));
+		return true;
 	}, [=](Data::UserpicsSlice &&slice) {
-		_writer->writeUserpicsSlice(slice);
+		if (ioCatchError(_writer->writeUserpicsSlice(slice))) {
+			return false;
+		}
+		_userpicsWritten += slice.list.size();
+		setState(stateUserpics(DownloadProgress()));
+		return true;
 	}, [=] {
-		_writer->writeUserpicsEnd();
+		if (ioCatchError(_writer->writeUserpicsEnd())) {
+			return;
+		}
 		exportNext();
 	});
 }
 
 void Controller::exportContacts() {
 	_api.requestContacts([=](Data::ContactsList &&result) {
-		_writer->writeContactsList(result);
+		if (ioCatchError(_writer->writeContactsList(result))) {
+			return;
+		}
 		exportNext();
 	});
 }
 
 void Controller::exportSessions() {
 	_api.requestSessions([=](Data::SessionsList &&result) {
-		_writer->writeSessionsList(result);
+		if (ioCatchError(_writer->writeSessionsList(result))) {
+			return;
+		}
 		exportNext();
 	});
 }
 
 void Controller::exportDialogs() {
-	_writer->writeDialogsStart(_dialogsInfo);
+	if (ioCatchError(_writer->writeDialogsStart(_dialogsInfo))) {
+		return;
+	}
 
 	exportNextDialog();
 }
@@ -379,22 +432,42 @@ void Controller::exportNextDialog() {
 	const auto index = ++_dialogIndex;
 	if (index < _dialogsInfo.list.size()) {
 		const auto &info = _dialogsInfo.list[index];
-		_writer->writeDialogStart(info);
+		_api.requestMessages(info, [=](const Data::DialogInfo &info) {
-
+			if (ioCatchError(_writer->writeDialogStart(info))) {
-		_api.requestMessages(info, [=](Data::MessagesSlice &&result) {
+				return false;
-			_writer->writeDialogSlice(result);
+			}
+			_messagesWritten = 0;
+			_messagesCount = info.messagesCount;
+			setState(stateDialogs(DownloadProgress()));
+			return true;
+		}, [=](DownloadProgress progress) {
+			setState(stateDialogs(progress));
+			return true;
+		}, [=](Data::MessagesSlice &&result) {
+			if (ioCatchError(_writer->writeDialogSlice(result))) {
+				return false;
+			}
+			_messagesWritten += result.list.size();
+			setState(stateDialogs(DownloadProgress()));
+			return true;
 		}, [=] {
-			_writer->writeDialogEnd();
+			if (ioCatchError(_writer->writeDialogEnd())) {
+				return;
+			}
 			exportNextDialog();
 		});
 		return;
 	}
-	_writer->writeDialogsEnd();
+	if (ioCatchError(_writer->writeDialogsEnd())) {
+		return;
+	}
 	exportNext();
 }
 
 void Controller::exportLeftChannels() {
-	_writer->writeLeftChannelsStart(_leftChannelsInfo);
+	if (ioCatchError(_writer->writeLeftChannelsStart(_leftChannelsInfo))) {
+		return;
+	}
 
 	exportNextLeftChannel();
 }
@@ -402,18 +475,36 @@ void Controller::exportLeftChannels() {
 void Controller::exportNextLeftChannel() {
 	const auto index = ++_leftChannelIndex;
 	if (index < _leftChannelsInfo.list.size()) {
-		const auto &chat = _leftChannelsInfo.list[index];
+		const auto &info = _leftChannelsInfo.list[index];
-		_writer->writeLeftChannelStart(chat);
+		_api.requestMessages(info, [=](const Data::DialogInfo &info) {
-
+			if (ioCatchError(_writer->writeLeftChannelStart(info))) {
-		_api.requestMessages(chat, [=](Data::MessagesSlice &&result) {
+				return false;
-			_writer->writeLeftChannelSlice(result);
+			}
+			_messagesWritten = 0;
+			_messagesCount = info.messagesCount;
+			setState(stateLeftChannels(DownloadProgress()));
+			return true;
+		}, [=](DownloadProgress progress) {
+			setState(stateLeftChannels(progress));
+			return true;
+		}, [=](Data::MessagesSlice &&result) {
+			if (ioCatchError(_writer->writeLeftChannelSlice(result))) {
+				return false;
+			}
+			_messagesWritten += result.list.size();
+			setState(stateLeftChannels(DownloadProgress()));
+			return true;
 		}, [=] {
-			_writer->writeLeftChannelEnd();
+			if (ioCatchError(_writer->writeLeftChannelEnd())) {
+				return;
+			}
 			exportNextLeftChannel();
 		});
 		return;
 	}
-	_writer->writeLeftChannelsEnd();
+	if (ioCatchError(_writer->writeLeftChannelsEnd())) {
+		return;
+	}
 	exportNext();
 }
 
@@ -451,9 +542,12 @@ ProcessingState Controller::statePersonalInfo() const {
 	return prepareState(Step::PersonalInfo);
 }
 
-ProcessingState Controller::stateUserpics() const {
+ProcessingState Controller::stateUserpics(DownloadProgress progress) const {
 	return prepareState(Step::Userpics, [&](ProcessingState &result) {
-
+		result.entityIndex = _userpicsWritten + progress.itemIndex;
+		result.entityCount = std::max(_userpicsCount, result.entityIndex);
+		result.bytesLoaded = progress.ready;
+		result.bytesCount = progress.total;
 	});
 }
 
@@ -465,26 +559,36 @@ ProcessingState Controller::stateSessions() const {
 	return prepareState(Step::Sessions);
 }
 
-ProcessingState Controller::stateLeftChannels() const {
+ProcessingState Controller::stateLeftChannels(
+		DownloadProgress progress) const {
 	const auto step = Step::LeftChannels;
 	return prepareState(step, [&](ProcessingState &result) {
-		//result.entityIndex = processed;
+		result.entityIndex = _leftChannelIndex;
-		//result.entityCount = std::max(processed, substepsInStep(step));
+		result.entityCount = _leftChannelsInfo.list.size();
+		result.itemIndex = _messagesWritten + progress.itemIndex;
+		result.itemCount = std::max(_messagesCount, result.entityIndex);
+		result.bytesLoaded = progress.ready;
+		result.bytesCount = progress.total;
 	});
 }
 
-ProcessingState Controller::stateDialogs() const {
+ProcessingState Controller::stateDialogs(DownloadProgress progress) const {
 	const auto step = Step::Dialogs;
 	return prepareState(step, [&](ProcessingState &result) {
-		//result.entityIndex = processed;
+		result.entityIndex = _dialogIndex;
-		//result.entityCount = std::max(processed, substepsInStep(step));
+		result.entityCount = _dialogsInfo.list.size();
+		result.itemIndex = _messagesWritten + progress.itemIndex;
+		result.itemCount = std::max(_messagesCount, result.entityIndex);
+		result.bytesLoaded = progress.ready;
+		result.bytesCount = progress.total;
 	});
 }
 
 int Controller::substepsInStep(Step step) const {
-	Expects(_substepsInStep.size() > static_cast<int>(step));
+	Expects(_substepsInStep != 0);
+	Expects(_substepsInStep->size() > static_cast<int>(step));
 
-	return _substepsInStep[static_cast<int>(step)];
+	return (*_substepsInStep)[static_cast<int>(step)];
 }
 
 void Controller::setFinishedState() {

Telegram/SourceFiles/export/export_controller.h

@@ -50,7 +50,7 @@ struct ProcessingState {
 
 	Step step = Step::Initializing;
 
-	std::vector<int> substepsInStep;
+	std::shared_ptr<const std::vector<int>> substepsInStep;
 
 	int entityIndex = 0;
 	int entityCount = 1;
@@ -68,15 +68,13 @@ struct ProcessingState {
 
 };
 
-struct ErrorState {
+struct ApiErrorState {
-	enum class Type {
+	RPCError data;
-		Unknown,
+
-		API,
+};
-		IO,
+
-	};
+struct OutputErrorState {
-	Type type = Type::Unknown;
+	QString path;
-	base::optional<RPCError> apiError;
-	base::optional<QString> ioErrorPath;
 
 };
 
@@ -88,7 +86,8 @@ struct FinishedState {
 using State = base::optional_variant<
 	PasswordCheckState,
 	ProcessingState,
-	ErrorState,
+	ApiErrorState,
+	OutputErrorState,
 	FinishedState>;
 
 //struct PasswordUpdate {

Telegram/SourceFiles/export/output/export_output_abstract.h

@@ -25,41 +25,55 @@ struct Settings;
 
 namespace Output {
 
+struct Result;
+
 enum class Format {
 	Text,
+	Yaml,
 	Html,
 	Json,
 };
 
 class AbstractWriter {
 public:
-	virtual bool start(const Settings &settings) = 0;
+	[[nodiscard]] virtual Result start(const Settings &settings) = 0;
 
-	virtual bool writePersonal(const Data::PersonalInfo &data) = 0;
+	[[nodiscard]] virtual Result writePersonal(
+		const Data::PersonalInfo &data) = 0;
 
-	virtual bool writeUserpicsStart(const Data::UserpicsInfo &data) = 0;
+	[[nodiscard]] virtual Result writeUserpicsStart(
-	virtual bool writeUserpicsSlice(const Data::UserpicsSlice &data) = 0;
+		const Data::UserpicsInfo &data) = 0;
-	virtual bool writeUserpicsEnd() = 0;
+	[[nodiscard]] virtual Result writeUserpicsSlice(
+		const Data::UserpicsSlice &data) = 0;
+	[[nodiscard]] virtual Result writeUserpicsEnd() = 0;
 
-	virtual bool writeContactsList(const Data::ContactsList &data) = 0;
+	[[nodiscard]] virtual Result writeContactsList(
+		const Data::ContactsList &data) = 0;
 
-	virtual bool writeSessionsList(const Data::SessionsList &data) = 0;
+	[[nodiscard]] virtual Result writeSessionsList(
+		const Data::SessionsList &data) = 0;
 
-	virtual bool writeDialogsStart(const Data::DialogsInfo &data) = 0;
+	[[nodiscard]] virtual Result writeDialogsStart(
-	virtual bool writeDialogStart(const Data::DialogInfo &data) = 0;
+		const Data::DialogsInfo &data) = 0;
-	virtual bool writeDialogSlice(const Data::MessagesSlice &data) = 0;
+	[[nodiscard]] virtual Result writeDialogStart(
-	virtual bool writeDialogEnd() = 0;
+		const Data::DialogInfo &data) = 0;
-	virtual bool writeDialogsEnd() = 0;
+	[[nodiscard]] virtual Result writeDialogSlice(
+		const Data::MessagesSlice &data) = 0;
+	[[nodiscard]] virtual Result writeDialogEnd() = 0;
+	[[nodiscard]] virtual Result writeDialogsEnd() = 0;
 
-	virtual bool writeLeftChannelsStart(const Data::DialogsInfo &data) = 0;
+	[[nodiscard]] virtual Result writeLeftChannelsStart(
-	virtual bool writeLeftChannelStart(const Data::DialogInfo &data) = 0;
+		const Data::DialogsInfo &data) = 0;
-	virtual bool writeLeftChannelSlice(const Data::MessagesSlice &data) = 0;
+	[[nodiscard]] virtual Result writeLeftChannelStart(
-	virtual bool writeLeftChannelEnd() = 0;
+		const Data::DialogInfo &data) = 0;
-	virtual bool writeLeftChannelsEnd() = 0;
+	[[nodiscard]] virtual Result writeLeftChannelSlice(
+		const Data::MessagesSlice &data) = 0;
+	[[nodiscard]] virtual Result writeLeftChannelEnd() = 0;
+	[[nodiscard]] virtual Result writeLeftChannelsEnd() = 0;
 
-	virtual bool finish() = 0;
+	[[nodiscard]] virtual Result finish() = 0;
 
-	virtual QString mainFilePath() = 0;
+	[[nodiscard]] virtual QString mainFilePath() = 0;
 
 	virtual ~AbstractWriter() = default;
 

Telegram/SourceFiles/export/output/export_output_file.cpp

@@ -7,6 +7,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "export/output/export_output_file.h"
 
+#include "export/output/export_output_result.h"
+
 #include <QtCore/QFileInfo>
 #include <QtCore/QDir>
 
@@ -26,47 +28,57 @@ bool File::empty() const {
 	return !_offset;
 }
 
-File::Result File::writeBlock(const QByteArray &block) {
+Result File::writeBlock(const QByteArray &block) {
 	const auto result = writeBlockAttempt(block);
-	if (result != Result::Success) {
+	if (!result) {
 		_file.clear();
 	}
 	return result;
 }
 
-File::Result File::writeBlockAttempt(const QByteArray &block) {
+Result File::writeBlockAttempt(const QByteArray &block) {
-	if (const auto result = reopen(); result != Result::Success) {
+	if (const auto result = reopen(); !result) {
 		return result;
 	}
-	return (_file->write(block) == block.size() && _file->flush())
+	if (_file->write(block) == block.size() && _file->flush()) {
-		? Result::Success
+		_offset += block.size();
-		: Result::Error;
+		return Result::Success();
+	}
+	return error();
 }
 
-File::Result File::reopen() {
+Result File::reopen() {
 	if (_file && _file->isOpen()) {
-		return Result::Success;
+		return Result::Success();
 	}
 	_file.emplace(_path);
 	if (_file->exists()) {
 		if (_file->size() < _offset) {
-			return Result::FatalError;
+			return fatalError();
 		} else if (!_file->resize(_offset)) {
-			return Result::Error;
+			return error();
 		}
 	} else if (_offset > 0) {
-		return Result::FatalError;
+		return fatalError();
 	}
 	if (_file->open(QIODevice::Append)) {
-		return Result::Success;
+		return Result::Success();
 	}
 	const auto info = QFileInfo(_path);
 	const auto dir = info.absoluteDir();
 	return (!dir.exists()
 		&& dir.mkpath(dir.absolutePath())
 		&& _file->open(QIODevice::Append))
-		? Result::Success
+		? Result::Success()
-		: Result::Error;
+		: error();
+}
+
+Result File::error() const {
+	return Result(Result::Type::Error, _path);
+}
+
+Result File::fatalError() const {
+	return Result(Result::Type::FatalError, _path);
 }
 
 QString File::PrepareRelativePath(

Telegram/SourceFiles/export/output/export_output_file.h

@@ -16,27 +16,27 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 namespace Export {
 namespace Output {
 
+struct Result;
+
 class File {
 public:
 	File(const QString &path);
 
-	int size() const;
+	[[nodiscard]] int size() const;
-	bool empty() const;
+	[[nodiscard]] bool empty() const;
 
-	enum class Result {
+	[[nodiscard]] Result writeBlock(const QByteArray &block);
-		Success,
-		Error,
-		FatalError,
-	};
-	Result writeBlock(const QByteArray &block);
 
-	static QString PrepareRelativePath(
+	[[nodiscard]] static QString PrepareRelativePath(
 		const QString &folder,
 		const QString &suggested);
 
 private:
-	Result reopen();
+	[[nodiscard]] Result reopen();
-	Result writeBlockAttempt(const QByteArray &block);
+	[[nodiscard]] Result writeBlockAttempt(const QByteArray &block);
+
+	[[nodiscard]] Result error() const;
+	[[nodiscard]] Result fatalError() const;
 
 	QString _path;
 	int _offset = 0;

Telegram/SourceFiles/export/output/export_output_result.h

@@ -0,0 +1,48 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include <QtCore/QString>
+
+namespace Export {
+namespace Output {
+
+struct Result {
+	enum class Type : char {
+		Success,
+		Error,
+		FatalError
+	};
+
+	Result(Type type, QString path) : type(type), path(path) {
+	}
+
+	static Result Success() {
+		return Result(Type::Success, QString());
+	}
+
+	bool isSuccess() const {
+		return type == Type::Success;
+	}
+	bool isError() const {
+		return (type == Type::Error) || (type == Type::FatalError);
+	}
+	bool isFatalError() const {
+		return (type == Type::FatalError);
+	}
+	explicit operator bool() const {
+		return isSuccess();
+	}
+
+	QString path;
+	Type type;
+
+};
+
+} // namespace Output
+} // namespace Export

Telegram/SourceFiles/export/output/export_output_text.cpp

@@ -7,6 +7,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "export/output/export_output_text.h"
 
+#include "export/output/export_output_result.h"
 #include "export/data/export_data_types.h"
 #include "core/utils.h"
 
@@ -431,16 +432,16 @@ QByteArray SerializeMessage(
 
 } // namespace
 
-bool TextWriter::start(const Settings &settings) {
+Result TextWriter::start(const Settings &settings) {
 	Expects(settings.path.endsWith('/'));
 
 	_settings = base::duplicate(settings);
-	_result = fileWithRelativePath(mainFileRelativePath());
+	_summary = fileWithRelativePath(mainFileRelativePath());
-	return true;
+	return Result::Success();
 }
 
-bool TextWriter::writePersonal(const Data::PersonalInfo &data) {
+Result TextWriter::writePersonal(const Data::PersonalInfo &data) {
-	Expects(_result != nullptr);
+	Expects(_summary != nullptr);
 
 	const auto &info = data.user.info;
 	const auto serialized = "Personal information"
@@ -454,25 +455,25 @@ bool TextWriter::writePersonal(const Data::PersonalInfo &data) {
 		{ "Bio", data.bio },
 		})
 		+ kLineBreak;
-	return _result->writeBlock(serialized) == File::Result::Success;
+	return _summary->writeBlock(serialized);
 }
 
-bool TextWriter::writeUserpicsStart(const Data::UserpicsInfo &data) {
+Result TextWriter::writeUserpicsStart(const Data::UserpicsInfo &data) {
-	Expects(_result != nullptr);
+	Expects(_summary != nullptr);
 
 	_userpicsCount = data.count;
 	if (!_userpicsCount) {
-		return true;
+		return Result::Success();
 	}
 	const auto serialized = "Personal photos "
 		"(" + Data::NumberToString(_userpicsCount) + ")"
 		+ kLineBreak
 		+ kLineBreak;
-	return _result->writeBlock(serialized) == File::Result::Success;
+	return _summary->writeBlock(serialized);
 }
 
-bool TextWriter::writeUserpicsSlice(const Data::UserpicsSlice &data) {
+Result TextWriter::writeUserpicsSlice(const Data::UserpicsSlice &data) {
-	Expects(_result != nullptr);
+	Expects(_summary != nullptr);
 	Expects(!data.list.empty());
 
 	auto lines = QByteArray();
@@ -489,22 +490,22 @@ bool TextWriter::writeUserpicsSlice(const Data::UserpicsSlice &data) {
 		}
 		lines.append(kLineBreak);
 	}
-	return _result->writeBlock(lines) == File::Result::Success;
+	return _summary->writeBlock(lines);
 }
 
-bool TextWriter::writeUserpicsEnd() {
+Result TextWriter::writeUserpicsEnd() {
-	Expects(_result != nullptr);
+	Expects(_summary != nullptr);
 
 	return (_userpicsCount > 0)
-		? _result->writeBlock(kLineBreak) == File::Result::Success
+		? _summary->writeBlock(kLineBreak)
-		: true;
+		: Result::Success();
 }
 
-bool TextWriter::writeContactsList(const Data::ContactsList &data) {
+Result TextWriter::writeContactsList(const Data::ContactsList &data) {
-	Expects(_result != nullptr);
+	Expects(_summary != nullptr);
 
 	if (data.list.empty()) {
-		return true;
+		return Result::Success();
 	}
 
 	const auto file = fileWithRelativePath("contacts.txt");
@@ -529,22 +530,22 @@ bool TextWriter::writeContactsList(const Data::ContactsList &data) {
 		}
 	}
 	const auto full = JoinList(kLineBreak, list);
-	if (file->writeBlock(full) != File::Result::Success) {
+	if (const auto result = file->writeBlock(full); !result) {
-		return false;
+		return result;
 	}
 
 	const auto header = "Contacts "
 		"(" + Data::NumberToString(data.list.size()) + ") - contacts.txt"
 		+ kLineBreak
 		+ kLineBreak;
-	return _result->writeBlock(header) == File::Result::Success;
+	return _summary->writeBlock(header);
 }
 
-bool TextWriter::writeSessionsList(const Data::SessionsList &data) {
+Result TextWriter::writeSessionsList(const Data::SessionsList &data) {
-	Expects(_result != nullptr);
+	Expects(_summary != nullptr);
 
 	if (data.list.empty()) {
-		return true;
+		return Result::Success();
 	}
 
 	const auto file = fileWithRelativePath("sessions.txt");
@@ -570,67 +571,68 @@ bool TextWriter::writeSessionsList(const Data::SessionsList &data) {
 		}));
 	}
 	const auto full = JoinList(kLineBreak, list);
-	if (file->writeBlock(full) != File::Result::Success) {
+	if (const auto result = file->writeBlock(full); !result) {
-		return false;
+		return result;
 	}
 
 	const auto header = "Sessions "
 		"(" + Data::NumberToString(data.list.size()) + ") - sessions.txt"
 		+ kLineBreak
 		+ kLineBreak;
-	return _result->writeBlock(header) == File::Result::Success;
+	return _summary->writeBlock(header);
 }
 
-bool TextWriter::writeDialogsStart(const Data::DialogsInfo &data) {
+Result TextWriter::writeDialogsStart(const Data::DialogsInfo &data) {
 	return writeChatsStart(data, "Chats", "chats.txt");
 }
 
-bool TextWriter::writeDialogStart(const Data::DialogInfo &data) {
+Result TextWriter::writeDialogStart(const Data::DialogInfo &data) {
 	return writeChatStart(data);
 }
 
-bool TextWriter::writeDialogSlice(const Data::MessagesSlice &data) {
+Result TextWriter::writeDialogSlice(const Data::MessagesSlice &data) {
 	return writeChatSlice(data);
 }
 
-bool TextWriter::writeDialogEnd() {
+Result TextWriter::writeDialogEnd() {
 	return writeChatEnd();
 }
 
-bool TextWriter::writeDialogsEnd() {
+Result TextWriter::writeDialogsEnd() {
-	return true;
+	return Result::Success();
 }
 
-bool TextWriter::writeLeftChannelsStart(const Data::DialogsInfo &data) {
+Result TextWriter::writeLeftChannelsStart(const Data::DialogsInfo &data) {
 	return writeChatsStart(data, "Left chats", "left_chats.txt");
 }
 
-bool TextWriter::writeLeftChannelStart(const Data::DialogInfo &data) {
+Result TextWriter::writeLeftChannelStart(const Data::DialogInfo &data) {
 	return writeChatStart(data);
 }
 
-bool TextWriter::writeLeftChannelSlice(const Data::MessagesSlice &data) {
+Result TextWriter::writeLeftChannelSlice(const Data::MessagesSlice &data) {
 	return writeChatSlice(data);
 }
 
-bool TextWriter::writeLeftChannelEnd() {
+Result TextWriter::writeLeftChannelEnd() {
 	return writeChatEnd();
 }
 
-bool TextWriter::writeLeftChannelsEnd() {
+Result TextWriter::writeLeftChannelsEnd() {
-	return true;
+	return Result::Success();
 }
 
-bool TextWriter::writeChatsStart(
+Result TextWriter::writeChatsStart(
 		const Data::DialogsInfo &data,
 		const QByteArray &listName,
 		const QString &fileName) {
-	Expects(_result != nullptr);
+	Expects(_summary != nullptr);
 
 	if (data.list.empty()) {
-		return true;
+		return Result::Success();
 	}
 
+	_dialogIndex = 0;
 	_dialogsCount = data.list.size();
 
 	using Type = Data::DialogInfo::Type;
@@ -676,8 +678,8 @@ bool TextWriter::writeChatsStart(
 		}));
 	}
 	const auto full = JoinList(kLineBreak, list);
-	if (file->writeBlock(full) != File::Result::Success) {
+	if (const auto result = file->writeBlock(full); !result) {
-		return false;
+		return result;
 	}
 
 	const auto header = listName + " "
@@ -685,10 +687,10 @@ bool TextWriter::writeChatsStart(
 		+ fileName.toUtf8()
 		+ kLineBreak
 		+ kLineBreak;
-	return _result->writeBlock(header) == File::Result::Success;
+	return _summary->writeBlock(header);
 }
 
-bool TextWriter::writeChatStart(const Data::DialogInfo &data) {
+Result TextWriter::writeChatStart(const Data::DialogInfo &data) {
 	Expects(_chat == nullptr);
 	Expects(_dialogIndex < _dialogsCount);
 
@@ -697,10 +699,10 @@ bool TextWriter::writeChatStart(const Data::DialogInfo &data) {
 	_chat = fileWithRelativePath(data.relativePath + "messages.txt");
 	_dialogEmpty = true;
 	_dialogOnlyMy = data.onlyMyMessages;
-	return true;
+	return Result::Success();
 }
 
-bool TextWriter::writeChatSlice(const Data::MessagesSlice &data) {
+Result TextWriter::writeChatSlice(const Data::MessagesSlice &data) {
 	Expects(_chat != nullptr);
 	Expects(!data.list.empty());
 
@@ -717,23 +719,26 @@ bool TextWriter::writeChatSlice(const Data::MessagesSlice &data) {
 	const auto full = _chat->empty()
 		? JoinList(kLineBreak, list)
 		: kLineBreak + JoinList(kLineBreak, list);
-	return _chat->writeBlock(full) == File::Result::Success;
+	return _chat->writeBlock(full);
 }
 
-bool TextWriter::writeChatEnd() {
+Result TextWriter::writeChatEnd() {
 	Expects(_chat != nullptr);
 
 	if (_dialogEmpty) {
-		_chat->writeBlock(_dialogOnlyMy
+		const auto result = _chat->writeBlock(_dialogOnlyMy
 			? "No outgoing messages in this chat."
 			: "No messages in this chat.");
+		if (!result) {
+			return result;
+		}
 	}
 	_chat = nullptr;
-	return true;
+	return Result::Success();
 }
 
-bool TextWriter::finish() {
+Result TextWriter::finish() {
-	return true;
+	return Result::Success();
 }
 
 QString TextWriter::mainFilePath() {

Telegram/SourceFiles/export/output/export_output_text.h

@@ -16,31 +16,31 @@ namespace Output {
 
 class TextWriter : public AbstractWriter {
 public:
-	bool start(const Settings &settings) override;
+	Result start(const Settings &settings) override;
 
-	bool writePersonal(const Data::PersonalInfo &data) override;
+	Result writePersonal(const Data::PersonalInfo &data) override;
 
-	bool writeUserpicsStart(const Data::UserpicsInfo &data) override;
+	Result writeUserpicsStart(const Data::UserpicsInfo &data) override;
-	bool writeUserpicsSlice(const Data::UserpicsSlice &data) override;
+	Result writeUserpicsSlice(const Data::UserpicsSlice &data) override;
-	bool writeUserpicsEnd() override;
+	Result writeUserpicsEnd() override;
 
-	bool writeContactsList(const Data::ContactsList &data) override;
+	Result writeContactsList(const Data::ContactsList &data) override;
 
-	bool writeSessionsList(const Data::SessionsList &data) override;
+	Result writeSessionsList(const Data::SessionsList &data) override;
 
-	bool writeDialogsStart(const Data::DialogsInfo &data) override;
+	Result writeDialogsStart(const Data::DialogsInfo &data) override;
-	bool writeDialogStart(const Data::DialogInfo &data) override;
+	Result writeDialogStart(const Data::DialogInfo &data) override;
-	bool writeDialogSlice(const Data::MessagesSlice &data) override;
+	Result writeDialogSlice(const Data::MessagesSlice &data) override;
-	bool writeDialogEnd() override;
+	Result writeDialogEnd() override;
-	bool writeDialogsEnd() override;
+	Result writeDialogsEnd() override;
 
-	bool writeLeftChannelsStart(const Data::DialogsInfo &data) override;
+	Result writeLeftChannelsStart(const Data::DialogsInfo &data) override;
-	bool writeLeftChannelStart(const Data::DialogInfo &data) override;
+	Result writeLeftChannelStart(const Data::DialogInfo &data) override;
-	bool writeLeftChannelSlice(const Data::MessagesSlice &data) override;
+	Result writeLeftChannelSlice(const Data::MessagesSlice &data) override;
-	bool writeLeftChannelEnd() override;
+	Result writeLeftChannelEnd() override;
-	bool writeLeftChannelsEnd() override;
+	Result writeLeftChannelsEnd() override;
 
-	bool finish() override;
+	Result finish() override;
 
 	QString mainFilePath() override;
 
@@ -49,17 +49,17 @@ private:
 	QString pathWithRelativePath(const QString &path) const;
 	std::unique_ptr<File> fileWithRelativePath(const QString &path) const;
 
-	bool writeChatsStart(
+	Result writeChatsStart(
 		const Data::DialogsInfo &data,
 		const QByteArray &listName,
 		const QString &fileName);
-	bool writeChatStart(const Data::DialogInfo &data);
+	Result writeChatStart(const Data::DialogInfo &data);
-	bool writeChatSlice(const Data::MessagesSlice &data);
+	Result writeChatSlice(const Data::MessagesSlice &data);
-	bool writeChatEnd();
+	Result writeChatEnd();
 
 	Settings _settings;
 
-	std::unique_ptr<File> _result;
+	std::unique_ptr<File> _summary;
 	int _userpicsCount = 0;
 
 	int _dialogsCount = 0;
@@ -67,10 +67,6 @@ private:
 	bool _dialogOnlyMy = false;
 	bool _dialogEmpty = true;
 
-	int _leftChannelsCount = 0;
-	int _leftChannelIndex = 0;
-	bool _leftChannelEmpty = true;
-
 	std::unique_ptr<File> _chat;
 
 };

Telegram/SourceFiles/export/view/export.style

@@ -37,3 +37,8 @@ exportFileSizeLabel: LabelSimple(defaultLabelSimple) {
 }
 exportFileSizePadding: margins(22px, 8px, 22px, 8px);
 exportFileSizeLabelBottom: 18px;
+exportErrorLabel: FlatLabel(boxLabel) {
+	minWidth: 175px;
+	align: align(top);
+	textFg: boxTextFgError;
+}

Telegram/SourceFiles/export/view/export_view_content.cpp

@@ -0,0 +1,53 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "export/view/export_view_content.h"
+
+#include "lang/lang_keys.h"
+
+namespace Export {
+namespace View {
+
+Content ContentFromState(const ProcessingState &state) {
+	using Step = ProcessingState::Step;
+
+	auto result = Content();
+	const auto push = [&](
+			const QString &id,
+			const QString &label,
+			const QString &info,
+			float64 progress) {
+		result.rows.push_back({ id, label, info, progress });
+	};
+	switch (state.step) {
+	case Step::Initializing:
+	case Step::LeftChannelsList:
+	case Step::DialogsList:
+	case Step::PersonalInfo:
+	case Step::Userpics:
+	case Step::Contacts:
+	case Step::Sessions:
+	case Step::LeftChannels:
+	case Step::Dialogs:
+		push("init", lang(lng_export_state_initializing), QString(), 0.);
+		if (state.entityCount > 0) {
+			push("entity", QString(), QString::number(state.entityIndex) + '/' + QString::number(state.entityCount), 0.);
+		}
+		if (state.itemCount > 0) {
+			push("item", QString(), QString::number(state.itemIndex) + '/' + QString::number(state.itemCount), 0.);
+		}
+		if (state.bytesCount > 0) {
+			push("bytes", QString(), QString::number(state.bytesLoaded) + '/' + QString::number(state.bytesCount), 0.);
+		}
+		break;
+	default: Unexpected("Step in ContentFromState.");
+	}
+	return result;
+}
+
+} // namespace View
+} // namespace Export

Telegram/SourceFiles/export/view/export_view_content.h

@@ -0,0 +1,41 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "export/export_controller.h"
+
+namespace Export {
+namespace View {
+
+struct Content {
+	struct Row {
+		QString id;
+		QString label;
+		QString info;
+		float64 progress = 0.;
+	};
+
+	std::vector<Row> rows;
+
+};
+
+Content ContentFromState(const ProcessingState &state);
+
+inline auto ContentFromState(rpl::producer<State> state) {
+	return std::move(
+		state
+	) | rpl::filter([](const State &state) {
+		return state.template is<ProcessingState>();
+	}) | rpl::map([](const State &state) {
+		return ContentFromState(
+			state.template get_unchecked<ProcessingState>());
+	});
+}
+
+} // namespace View
+} // namespace Export

Telegram/SourceFiles/export/view/export_view_panel_controller.cpp

@@ -8,8 +8,11 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 #include "export/view/export_view_panel_controller.h"
 
 #include "export/view/export_view_settings.h"
+#include "export/view/export_view_progress.h"
 #include "export/view/export_view_done.h"
+#include "ui/widgets/labels.h"
 #include "ui/widgets/separate_panel.h"
+#include "ui/wrap/padding_wrap.h"
 #include "lang/lang_keys.h"
 #include "core/file_utilities.h"
 #include "styles/style_export.h"
@@ -43,6 +46,9 @@ void PanelController::showSettings() {
 
 	settings->startClicks(
 	) | rpl::start_with_next([=](const Settings &settings) {
+		_panel->showInner(base::make_unique_q<ProgressWidget>(
+			_panel.get(),
+			ContentFromState(_process->state())));
 		_process->startExport(settings);
 	}, settings->lifetime());
 
@@ -54,6 +60,34 @@ void PanelController::showSettings() {
 	_panel->showInner(std::move(settings));
 }
 
+void PanelController::showError(const ApiErrorState &error) {
+	showError("API Error happened :(\n"
+		+ QString::number(error.data.code()) + ": " + error.data.type()
+		+ "\n" + error.data.description());
+}
+
+void PanelController::showError(const OutputErrorState &error) {
+	showError("Disk Error happened :(\n"
+		"Could not write path:\n" + error.path);
+}
+
+void PanelController::showError(const QString &text) {
+	auto container = base::make_unique_q<Ui::PaddingWrap<Ui::FlatLabel>>(
+		_panel.get(),
+		object_ptr<Ui::FlatLabel>(
+			_panel.get(),
+			text,
+			Ui::FlatLabel::InitType::Simple,
+			st::exportErrorLabel),
+		style::margins(0, st::exportPanelSize.height() / 4, 0, 0));
+	container->widthValue(
+	) | rpl::start_with_next([label = container->entity()](int width) {
+		label->resize(width, label->height());
+	}, container->lifetime());
+
+	_panel->showInner(std::move(container));
+}
+
 rpl::producer<> PanelController::closed() const {
 	return _panelCloseEvents.events(
 	) | rpl::flatten_latest(
@@ -67,7 +101,11 @@ void PanelController::updateState(State &&state) {
 		createPanel();
 	}
 	_state = std::move(state);
-	if (const auto finished = base::get_if<FinishedState>(&_state)) {
+	if (const auto apiError = base::get_if<ApiErrorState>(&_state)) {
+		showError(*apiError);
+	} else if (const auto error = base::get_if<OutputErrorState>(&_state)) {
+		showError(*error);
+	} else if (const auto finished = base::get_if<FinishedState>(&_state)) {
 		const auto path = finished->path;
 
 		auto done = base::make_unique_q<DoneWidget>(_panel.get());

Telegram/SourceFiles/export/view/export_view_panel_controller.h

@@ -31,6 +31,9 @@ private:
 	void createPanel();
 	void updateState(State &&state);
 	void showSettings();
+	void showError(const ApiErrorState &error);
+	void showError(const OutputErrorState &error);
+	void showError(const QString &text);
 
 	not_null<ControllerWrap*> _process;
 

Telegram/SourceFiles/export/view/export_view_progress.cpp

@@ -0,0 +1,46 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#include "export/view/export_view_progress.h"
+
+#include "ui/widgets/labels.h"
+#include "styles/style_boxes.h"
+
+namespace Export {
+namespace View {
+
+ProgressWidget::ProgressWidget(
+	QWidget *parent,
+	rpl::producer<Content> content)
+: RpWidget(parent) {
+	const auto label = Ui::CreateChild<Ui::FlatLabel>(this, st::boxLabel);
+	sizeValue(
+	) | rpl::start_with_next([=](QSize size) {
+		label->setGeometry(QRect(QPoint(), size));
+	}, label->lifetime());
+	std::move(
+		content
+	) | rpl::start_with_next([=](Content &&content) {
+		auto text = QString();
+		for (const auto &row : content.rows) {
+			text += row.id + ' ' + row.info + ' ' + row.label + '\n';
+		}
+		label->setText(text);
+		updateState(std::move(content));
+	}, lifetime());
+}
+
+void ProgressWidget::updateState(Content &&content) {
+	_content = std::move(content);
+
+
+}
+
+ProgressWidget::~ProgressWidget() = default;
+
+} // namespace View
+} // namespace Export

Telegram/SourceFiles/export/view/export_view_progress.h

@@ -0,0 +1,35 @@
+/*
+This file is part of Telegram Desktop,
+the official desktop application for the Telegram messaging service.
+
+For license and copyright information please follow this link:
+https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
+*/
+#pragma once
+
+#include "ui/rp_widget.h"
+#include "export/view/export_view_content.h"
+
+namespace Export {
+namespace View {
+
+class ProgressWidget : public Ui::RpWidget {
+public:
+	ProgressWidget(
+		QWidget *parent,
+		rpl::producer<Content> content);
+
+	~ProgressWidget();
+
+private:
+	void updateState(Content &&content);
+
+	Content _content;
+
+	class Row;
+	std::vector<base::unique_qptr<Row>> _rows;
+
+};
+
+} // namespace View
+} // namespace Export

Telegram/SourceFiles/mtproto/concurrent_sender.cpp

@@ -9,6 +9,7 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 
 #include "mtproto/mtp_instance.h"
 #include "mtproto/rpc_sender.h"
+#include "mtproto/session.h"
 
 namespace MTP {
 
@@ -178,7 +179,13 @@ void ConcurrentSender::senderRequestDone(
 		mtpRequestId requestId,
 		bytes::const_span result) {
 	if (auto handlers = _requests.take(requestId)) {
-		std::move(handlers->done)(requestId, result);
+		try {
+			std::move(handlers->done)(requestId, result);
+		} catch (Exception &e) {
+			std::move(handlers->fail)(requestId, internal::rpcClientError(
+				"RESPONSE_PARSE_FAILED",
+				QString("exception text: ") + e.what()));
+		}
 	}
 }
 

Telegram/SourceFiles/mtproto/concurrent_sender.h

@@ -203,14 +203,11 @@ void ConcurrentSender::RequestBuilder::setDoneHandler(
 	_handlers.done = [handler = std::move(invoke)](
 			mtpRequestId requestId,
 			bytes::const_span result) mutable {
-		try {
+		auto from = reinterpret_cast<const mtpPrime*>(result.data());
-			auto from = reinterpret_cast<const mtpPrime*>(result.data());
+		const auto end = from + result.size() / sizeof(mtpPrime);
-			const auto end = from + result.size() / sizeof(mtpPrime);
+		Response data;
-			Response data;
+		data.read(from, end);
-			data.read(from, end);
+		std::move(handler)(requestId, std::move(data));
-			std::move(handler)(requestId, std::move(data));
-		} catch (...) {
-		}
 	};
 }
 

Telegram/gyp/telegram_sources.txt

@@ -225,10 +225,14 @@
 <(src_loc)/dialogs/dialogs_search_from_controllers.h
 <(src_loc)/dialogs/dialogs_widget.cpp
 <(src_loc)/dialogs/dialogs_widget.h
+<(src_loc)/export/view/export_view_content.cpp
+<(src_loc)/export/view/export_view_content.h
 <(src_loc)/export/view/export_view_done.cpp
 <(src_loc)/export/view/export_view_done.h
 <(src_loc)/export/view/export_view_panel_controller.cpp
 <(src_loc)/export/view/export_view_panel_controller.h
+<(src_loc)/export/view/export_view_progress.cpp
+<(src_loc)/export/view/export_view_progress.h
 <(src_loc)/export/view/export_view_settings.cpp
 <(src_loc)/export/view/export_view_settings.h
 <(src_loc)/history/admin_log/history_admin_log_filter.cpp