private async Task <DownloadResponse> DownloadDataTaskAsync()
{
cancellationToken.ThrowIfCancellationRequested();
using (var dataDownloader = new WebClientEx())
using (cancellationToken.Register(dataDownloader.CancelAsync))
{
if (downloadRange != null)
{
dataDownloader.SetRange(downloadRange.Low, downloadRange.High);
}
cancellationToken.ThrowIfCancellationRequested();
Logger.Info(
$"{request.StreamType}: Segment: {SegmentId(request.SegmentId)} Requested. URL: {request.DownloadSegment.Url} Range: {downloadRange}");
long bytesReceived = 0;
dataDownloader.DownloadProgressChanged += (sender, args) => { bytesReceived = args.BytesReceived; };
Stopwatch watch = null;
try
{
watch = Stopwatch.StartNew();
var data = await dataDownloader.DownloadDataTaskAsync(request.DownloadSegment.Url).ConfigureAwait(false);
return(new DownloadResponse
{
StreamType = request.StreamType,
DownloadSegment = request.DownloadSegment,
SegmentId = request.SegmentId,
Data = data
});
}
finally
{
if (watch != null)
{
throughputHistory.Push((int)bytesReceived, watch.Elapsed);
}
}
}
}
private async Task <DownloadResponse> DownloadDataTaskAsync()
{
cancellationToken.ThrowIfCancellationRequested();
Logger.Info(
$"{request.StreamType}: Segment: {SegmentId(request.SegmentId)} Requested. URL: {request.DownloadSegment.Url} Range: {downloadRange}");
using (var httpRequest = CreateHttpRequest())
{
var watch = Stopwatch.StartNew();
long totalBytesReceived = 0;
try
{
using (var response = await client.SendAsync(httpRequest, HttpCompletionOption.ResponseHeadersRead,
cancellationToken))
{
StatusCode = response.StatusCode;
response.EnsureSuccessStatusCode();
using (var stream = await response.Content.ReadAsStreamAsync())
using (var reader = new AsyncBinaryReader(stream))
{
byte[] buffer;
do
{
buffer = await ReadChunk(reader);
PushChunk(buffer);
totalBytesReceived += buffer.Length;
} while (buffer.Length != 0);
return(CreateDownloadResponse());
}
}
}
finally
{
throughputHistory.Push((int)totalBytesReceived, watch.Elapsed);
}
}
}
