private async Task RunDownload(Model.Download download, Action <HttpWebRequest> configureRequest, FileRenameStreamer fileRenameStreamer)
{
try
{
_cancellationTokenSource = new CancellationTokenSource();
var request = (HttpWebRequest)WebRequest.Create(new Uri(download.SourcePath));
configureRequest(request);
using (var response = await request.GetResponseAsync())
{
fileRenameStreamer.SetContentLength(response.ContentLength);
var data = response.GetResponseStream();
using (fileRenameStreamer)
{
var byteBuffer = fileRenameStreamer.GetByteBuffer();
fileRenameStreamer.SetStreamPosition(download.GetBytesFromAllParts());
download.TotalFileSize = fileRenameStreamer.GetTotalFileSize();
await MakeDownload(download, data, byteBuffer, _cancellationTokenSource.Token, fileRenameStreamer);
}
}
}
catch (IOException)
{
DownloadCancel?.Invoke(this, new MyDownloadEventArgs());
}
catch (OperationCanceledException)
{
if (download.State == CurrentDownloadState.Cancel)
{
DeleteDownload(download);
}
else if (download.State == CurrentDownloadState.Pause)
{
DownloadPause?.Invoke(this, new MyDownloadEventArgs());
}
else
{
DeleteDownload(download);
}
}
catch (WebException)
{
DownloadCancel?.Invoke(this, new MyDownloadEventArgs());
}
}
private async Task MakeDownload(Model.Download download, Stream data, byte[] byteBuffer, CancellationToken cancellationToken, FileRenameStreamer fileRenameStreamer)
{
using (var output = fileRenameStreamer.GetFileStream())
{
var onProgressChanged = new Progress <MyProgress>(OnDownloadProgressChanged);
var oldPercentDone = 0.0;
var bytesRead = 0;
download.StartDownloadPart();
do
{
bytesRead = await data.ReadAsync(byteBuffer, 0, byteBuffer.Length, cancellationToken);
download.AddBytesToPart(bytesRead);
fileRenameStreamer.AddCurrentBytesRead(bytesRead);
if (bytesRead <= 0)
{
continue;
}
await output.WriteAsync(byteBuffer, 0, bytesRead, cancellationToken);
oldPercentDone = SendDownloadProgress(onProgressChanged, download, oldPercentDone);
} while (bytesRead > 0);
download.FinishDownloadPart();
download.DumpLogFromAllParts();
CompleteDownload(download);
}
}