private async Task <DriveItem> InternalTransferDriveItem(IDriveProxy sourceDrive, IDriveProxy targetDrive, DriveItem driveItem)
{
DriveItem newDriveItem;
try
{
newDriveItem = await targetDrive.CreateOrUpdateAsync(driveItem);
}
// retry if download link has expired
catch (Exception)
{
_logger.LogWarning($"Download URI is null or has expired, requesting new one.");
driveItem.SetUri(await sourceDrive.GetDownloadUriAsync(driveItem));
newDriveItem = await targetDrive.CreateOrUpdateAsync(driveItem);
}
await targetDrive.SetLastWriteTimeUtcAsync(driveItem);
return(newDriveItem);
}
private async Task <bool> CheckConflict(Conflict conflict)
{
var remoteItem = _context.RemoteStates.FirstOrDefault(current => current.GetItemPath() == conflict.OriginalFilePath);
var originalDriveItem = conflict.OriginalFilePath.ToDriveItem(DriveItemType.File);
// original file exists locally
if (await _localDrive.ExistsAsync(originalDriveItem))
{
_logger.LogDebug($"Original file exists locally.");
var conflictDriveItem = conflict.ConflictFilePath.ToDriveItem(DriveItemType.File);
// conflict file exists locally
// actions: do nothing - user must delete or rename conflict file manually
if (await _localDrive.ExistsAsync(conflictDriveItem))
{
_logger.LogDebug($"Conflict file exists locally. Action(s): do nothing.");
}
// conflict file does not exist locally, i.e. conflict is solved
else
{
_logger.LogDebug($"Conflict file does not exist locally.");
// remote file is tracked in database
if (remoteItem != null)
{
_logger.LogDebug($"Remote file is tracked in database.");
// hashes are equal
// actions: do nothing
if (await _localDrive.GetHashAsync(originalDriveItem) == remoteItem.QuickXorHash)
{
_logger.LogDebug($"File is unchanged. Action(s): do nothing.");
}
// actions: upload file and replace remote version
else
{
_logger.LogInformation($"File was modified. Action(s): upload and replace file.");
originalDriveItem = await _localDrive.ToFullDriveItem(originalDriveItem);
var driveItem = await _remoteDrive.CreateOrUpdateAsync(originalDriveItem);
_context.RemoteStates.Add(driveItem.ToRemoteState());
}
}
// remote file is not tracked in database (e.g. upload failed previously)
// actions: upload file
else
{
_logger.LogInformation($"Remote file is not tracked in database. Action(s): upload file.");
originalDriveItem = await _localDrive.ToFullDriveItem(originalDriveItem);
var driveItem = await _remoteDrive.CreateOrUpdateAsync(originalDriveItem);
_context.RemoteStates.Add(driveItem.ToRemoteState());
}
return(true);
}
}
// original file does not exist locally
// actions: do nothing - user must delete or rename conflict file manually
else
{
_logger.LogDebug($"Original file does not exist locally. Action(s): do nothing.");
}
return(false);
}