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/* 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 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "backends/cloud/savessyncrequest.h"
#include "common/debug.h"
#include "common/file.h"
namespace Cloud {
SavesSyncRequest::SavesSyncRequest(Storage *storage, Storage::BoolCallback callback):
Request(nullptr), _storage(storage), _boolCallback(callback),
_workingRequest(nullptr), _ignoreCallback(false) {
start();
}
SavesSyncRequest::~SavesSyncRequest() {
_ignoreCallback = true;
if (_workingRequest) _workingRequest->finish();
delete _boolCallback;
}
void SavesSyncRequest::start() {
//cleanup
_ignoreCallback = true;
if (_workingRequest) _workingRequest->finish();
_currentDownloadingFile = StorageFile();
_currentUploadingFile = "";
_filesToDownload.clear();
_filesToUpload.clear();
_localFilesTimestamps.clear();
_ignoreCallback = false;
//load timestamps
loadTimestamps();
//list saves directory
_workingRequest = _storage->listDirectory("saves", new Common::Callback<SavesSyncRequest, Storage::FileArrayResponse>(this, &SavesSyncRequest::directoryListedCallback));
}
void SavesSyncRequest::directoryListedCallback(Storage::FileArrayResponse pair) {
if (_ignoreCallback) return;
//TODO: somehow ListDirectory requests must indicate that file array is incomplete
const uint32 INVALID_TIMESTAMP = UINT_MAX;
//determine which files to download and which files to upload
Common::Array<StorageFile> &remoteFiles = pair.value;
for (uint32 i = 0; i < remoteFiles.size(); ++i) {
StorageFile &file = remoteFiles[i];
if (file.isDirectory()) continue;
Common::String name = file.name();
if (!_localFilesTimestamps.contains(name))
_filesToDownload.push_back(file);
else {
if (_localFilesTimestamps[name] != INVALID_TIMESTAMP) {
if (_localFilesTimestamps[name] == file.timestamp())
continue;
//we actually can have some files not only with timestamp < remote
//but also with timestamp > remote (when we have been using ANOTHER CLOUD and then switched back)
if (_localFilesTimestamps[name] < file.timestamp())
_filesToDownload.push_back(file);
else
_filesToUpload.push_back(file.name());
}
}
}
//upload files with invalid timestamp (the ones we've added - means they might not have any remote version)
for (Common::HashMap<Common::String, uint32>::iterator i = _localFilesTimestamps.begin(); i != _localFilesTimestamps.end(); ++i) {
if (i->_value == INVALID_TIMESTAMP)
_filesToUpload.push_back(i->_key);
}
//start downloading files
downloadNextFile();
}
void SavesSyncRequest::downloadNextFile() {
if (_filesToDownload.empty()) {
uploadNextFile();
return;
}
_currentDownloadingFile = _filesToDownload.back();
_filesToDownload.pop_back();
_workingRequest = _storage->download(_currentDownloadingFile.path(), "saves/" + _currentDownloadingFile.name(),
new Common::Callback<SavesSyncRequest, Storage::BoolResponse>(this, &SavesSyncRequest::fileDownloadedCallback)
);
}
void SavesSyncRequest::fileDownloadedCallback(Storage::BoolResponse pair) {
if (_ignoreCallback) return;
//stop syncing if download failed
if (!pair.value) {
finish();
return;
}
//update local timestamp for downloaded file
_localFilesTimestamps[_currentDownloadingFile.name()] = _currentDownloadingFile.timestamp();
//continue downloading files
downloadNextFile();
}
void SavesSyncRequest::uploadNextFile() {
if (_filesToUpload.empty()) {
finishBool(true);
return;
}
_currentUploadingFile = _filesToUpload.back();
_filesToUpload.pop_back();
_workingRequest = _storage->upload("saves/" + _currentUploadingFile, nullptr, //TODO: pass save's read stream
new Common::Callback<SavesSyncRequest, Storage::BoolResponse>(this, &SavesSyncRequest::fileUploadedCallback)
);
}
void SavesSyncRequest::fileUploadedCallback(Storage::BoolResponse pair) {
if (_ignoreCallback) return;
//stop syncing if upload failed
if (!pair.value) {
finish();
return;
}
//TODO: update local timestamp for the uploaded file
//_localFilesTimestamps[_currentUploadingFile] = pair.request.<what?>;
//continue uploading files
uploadNextFile();
}
void SavesSyncRequest::handle() {}
void SavesSyncRequest::restart() { start(); }
void SavesSyncRequest::finish() { finishBool(false); }
void SavesSyncRequest::finishBool(bool success) {
Request::finish();
//save updated timestamps (even if Request failed, there would be only valid timestamps)
saveTimestamps();
if (_boolCallback) (*_boolCallback)(Storage::BoolResponse(this, success));
}
void SavesSyncRequest::loadTimestamps() {
Common::File f;
if (!f.open("saves/timestamps"))
error("SavesSyncRequest: failed to open 'saves/timestamps' file to load timestamps");
while (!f.eos()) {
//read filename into buffer (reading until the first ' ')
Common::String buffer;
while (!f.eos()) {
byte b = f.readByte();
if (b == ' ') break;
buffer += (char)b;
}
//read timestamp info buffer (reading until ' ' or some line ending char)
Common::String filename = buffer;
bool lineEnded = false;
buffer = "";
while (!f.eos()) {
byte b = f.readByte();
if (b == ' ' || b == '\n' || b == '\r') {
lineEnded = (b == '\n');
break;
}
buffer += (char)b;
}
//parse timestamp
uint timestamp = atol(buffer.c_str());
_localFilesTimestamps[filename] = timestamp;
//read until the end of the line
if (!lineEnded) {
while (!f.eos()) {
byte b = f.readByte();
if (b == '\n') break;
}
}
}
f.close();
}
void SavesSyncRequest::saveTimestamps() {
Common::DumpFile f;
if (!f.open("saves/timestamps", true))
error("SavesSyncRequest: failed to open 'saves/timestamps' file to save timestamps");
Common::String data;
for (Common::HashMap<Common::String, uint32>::iterator i = _localFilesTimestamps.begin(); i != _localFilesTimestamps.end(); ++i)
data += i->_key + Common::String::format(" %u\n", i->_value);
if (f.write(data.c_str(), data.size()) != data.size())
error("SavesSyncRequest: failed to write timestamps data into 'saves/timestamps'");
f.close();
}
} // End of namespace Cloud
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