meds-processor, p2, s6

HzzoExcelDownloader.cs

async Task<HzzoMedsDownloadDto> DownloadExcel(HzzoMedsDownloadDto doc)
{
  doc.DocumentStream = await _httpCli.GetStreamAsync(doc.Href);
  return doc;
}

static Task SaveExcel(HzzoMedsDownloadDto doc) =>
  Task.Factory.StartNew(() =>
  {
    using(var fileStream = File.Create(doc.FilePath, BUFFER_SIZE, FileOptions.Asynchronous))
    {
      CopyStream(doc.DocumentStream, fileStream);
    }
  }, TaskCreationOptions.LongRunning);

/// <summary>
/// Copies the contents of input to output. Doesn't close either stream.
/// </summary>
static void CopyStream(Stream input, Stream output)
{
  byte[] buffer = new byte[BUFFER_SIZE];
  int len;

  while ((len = input.Read(buffer, 0, buffer.Length)) > 0)
    output.Write(buffer, 0, len);
}