/// <inheritdoc />
public async Task <Tuple <FileStream, ErrorMessageResponse> > RetrieveDownloadStream(FileTicketResponse ticket, CancellationToken cancellationToken)
{
if (ticket == null)
{
throw new ArgumentNullException(nameof(ticket));
}
FileDownloadProvider downloadProvider;
lock (downloadTickets)
{
if (!downloadTickets.TryGetValue(ticket.FileTicket, out downloadProvider))
{
logger.LogTrace("Download ticket {0} not found!", ticket.FileTicket);
return(Tuple.Create <FileStream, ErrorMessageResponse>(null, null));
}
downloadTickets.Remove(ticket.FileTicket);
}
var errorCode = downloadProvider.ActivationCallback();
if (errorCode.HasValue)
{
logger.LogDebug("Download ticket {0} failed activation!", ticket.FileTicket);
return(Tuple.Create <FileStream, ErrorMessageResponse>(null, new ErrorMessageResponse(errorCode.Value)));
}
FileStream stream;
try
{
if (downloadProvider.FileStreamProvider != null)
{
stream = await downloadProvider.FileStreamProvider(cancellationToken).ConfigureAwait(false);
}
else
{
stream = ioManager.GetFileStream(downloadProvider.FilePath, downloadProvider.ShareWrite);
}
}
catch (IOException ex)
{
return(Tuple.Create <FileStream, ErrorMessageResponse>(
null,
new ErrorMessageResponse(ErrorCode.IOError)
{
AdditionalData = ex.ToString()
}));
}
try
{
logger.LogTrace("Ticket {0} downloading...", ticket.FileTicket);
return(Tuple.Create <FileStream, ErrorMessageResponse>(stream, null));
}
catch
{
stream.Dispose();
throw;
}
}
