Initial commit

backends/cloud/downloadrequest.cpp

@@ -0,0 +1,137 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "backends/cloud/downloadrequest.h"
+#include "backends/networking/http/connectionmanager.h"
+#include "common/textconsole.h"
+
+namespace Cloud {
+
+DownloadRequest::DownloadRequest(Storage *storage, Storage::BoolCallback callback, Networking::ErrorCallback ecb, const Common::String &remoteFileId, Common::DumpFile *dumpFile):
+	Request(nullptr, ecb), _boolCallback(callback), _localFile(dumpFile), _remoteFileId(remoteFileId), _storage(storage),
+	_remoteFileStream(nullptr), _workingRequest(nullptr), _ignoreCallback(false), _buffer(new byte[DOWNLOAD_REQUEST_BUFFER_SIZE]) {
+	start();
+}
+
+DownloadRequest::~DownloadRequest() {
+	_ignoreCallback = true;
+	if (_workingRequest)
+		_workingRequest->finish();
+	delete _boolCallback;
+	delete _localFile;
+	delete[] _buffer;
+}
+
+void DownloadRequest::start() {
+	_ignoreCallback = true;
+	if (_workingRequest)
+		_workingRequest->finish();
+	_remoteFileStream = nullptr;
+	//TODO: add some way to reopen DumpFile, so DownloadRequest could be restarted
+	_ignoreCallback = false;
+
+	_workingRequest = _storage->streamFileById(
+		_remoteFileId,
+		new Common::Callback<DownloadRequest, const Networking::NetworkReadStreamResponse &>(this, &DownloadRequest::streamCallback),
+		new Common::Callback<DownloadRequest, const Networking::ErrorResponse &>(this, &DownloadRequest::streamErrorCallback)
+	);
+}
+
+void DownloadRequest::streamCallback(const Networking::NetworkReadStreamResponse &response) {
+	_workingRequest = nullptr;
+	if (_ignoreCallback)
+		return;
+	_remoteFileStream = response.value;
+}
+
+void DownloadRequest::streamErrorCallback(const Networking::ErrorResponse &error) {
+	_workingRequest = nullptr;
+	if (_ignoreCallback)
+		return;
+	finishError(error);
+}
+
+void DownloadRequest::handle() {
+	if (!_localFile) {
+		warning("DownloadRequest: no file to write");
+		finishError(Networking::ErrorResponse(this, false, true, "DownloadRequest::handle: no file to write into", -1));
+		return;
+	}
+
+	if (!_localFile->isOpen()) {
+		warning("DownloadRequest: failed to open file to write");
+		finishError(Networking::ErrorResponse(this, false, true, "DownloadRequest::handle: failed to open file to write", -1));
+		return;
+	}
+
+	if (!_remoteFileStream) {
+		//waiting for callback
+		return;
+	}
+
+	uint32 readBytes = _remoteFileStream->read(_buffer, DOWNLOAD_REQUEST_BUFFER_SIZE);
+
+	if (readBytes != 0)
+		if (_localFile->write(_buffer, readBytes) != readBytes) {
+			warning("DownloadRequest: unable to write all received bytes into output file");
+			finishError(Networking::ErrorResponse(this, false, true, "DownloadRequest::handle: failed to write all bytes into a file", -1));
+			return;
+		}
+
+	if (_remoteFileStream->eos()) {
+		if (_remoteFileStream->httpResponseCode() != 200) {
+			warning("DownloadRequest: HTTP response code is not 200 OK (it's %ld)", _remoteFileStream->httpResponseCode());
+			//TODO: do something about it actually
+			// the problem is file's already downloaded, stream is over
+			// so we can't return error message anymore
+		}
+
+		finishDownload(_remoteFileStream->httpResponseCode() == 200);
+
+		_localFile->close(); //yes, I know it's closed automatically in ~DumpFile()
+	}
+}
+
+void DownloadRequest::restart() {
+	warning("DownloadRequest: can't restart as there are no means to reopen DumpFile");
+	finishError(Networking::ErrorResponse(this, false, true, "DownloadRequest::restart: can't restart as there are no means to reopen DumpFile", -1));
+	//start();
+}
+
+void DownloadRequest::finishDownload(bool success) {
+	Request::finishSuccess();
+	if (_boolCallback)
+		(*_boolCallback)(Storage::BoolResponse(this, success));
+}
+
+void DownloadRequest::finishError(const Networking::ErrorResponse &error, Networking::RequestState state) {
+	if (_localFile)
+		_localFile->close();
+	Request::finishError(error);
+}
+
+double DownloadRequest::getProgress() const {
+	if (_remoteFileStream)
+		return _remoteFileStream->getProgress();
+	return 0;
+}
+
+} // End of namespace Cloud