async Task ReadPartialRemoteStream(
HttpResponseMessage response,
Stream localStream,
long existingLength,
int threadNumber,
long contentLength)
{
int byteSize = 0;
long totalReceived = byteSize + existingLength,
nowReceived = 0;
byte[] buffer = new byte[bufflength];
#if (NETCOREAPP)
using (Stream remoteStream = await response.Content.ReadAsStreamAsync())
#else
using (Stream remoteStream = await response.Content.ReadAsStreamAsync())
#endif
{
var sw = Stopwatch.StartNew();
while ((byteSize = await remoteStream.ReadAsync(buffer, 0, buffer.Length, downloadPartialToken)) > 0)
{
downloadPartialToken.ThrowIfCancellationRequested();
localStream.Write(buffer, 0, byteSize);
totalReceived += byteSize;
nowReceived += byteSize;
segmentDownloadProperties[threadNumber] = new SegmentDownloadProperties(totalReceived, nowReceived, contentLength, sw.Elapsed.TotalSeconds)
{
CurrentReceived = byteSize
};
}
sw.Stop();
}
}
public async Task <bool> GetPartialSessionStream(SegmentDownloadProperties j)
{
Stream stream;
try
{
string partialOutput = string.Format("{0}.{1:000}", downloadPartialOutputPath, j.PartRange + 1);
FileInfo fileinfo = new FileInfo(partialOutput);
#if DEBUG
Console.WriteLine($"\tPart {j.PartRange + 1} > Start: {j.StartRange}{(j.StartRange == 0 ? "\t" : "")}\tEnd: {j.EndRange}\tSize: {BpUtility.ToBytesCount(j.EndRange - j.StartRange)}");
#endif
long existingLength = fileinfo.Exists ? fileinfo.Length : 0;
long fileSize = (j.EndRange - j.StartRange) + 1;
if (existingLength > fileSize)
{
fileinfo.Create();
}
if (existingLength != fileSize)
{
using (HttpClient client = new HttpClient())
{
HttpRequestMessage request = new HttpRequestMessage()
{
RequestUri = new Uri(downloadPartialInputPath)
};
request.Headers.TryAddWithoutValidation("User-Agent", App.UserAgent);
request.Headers.Range = new RangeHeaderValue(j.StartRange + existingLength, j.EndRange);
HttpResponseMessage response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, downloadPartialToken);
using (stream = fileinfo.Open(FileMode.Append, FileAccess.Write))
{
try
{
await ReadPartialRemoteStream(response, stream, existingLength, j.PartRange, j.EndRange - j.StartRange);
}
catch (OperationCanceledException)
{
stream.Dispose();
throw new OperationCanceledException();
}
}
}
}
else if (existingLength == fileSize)
{
segmentDownloadProperties[j.PartRange] = new SegmentDownloadProperties(fileSize, 0, fileSize, new TimeSpan().TotalSeconds)
{
CurrentReceived = 0
};
}
}
catch (OperationCanceledException)
{
#if DEBUG
Console.WriteLine($"Download cancelled for part {j.PartRange + 1}");
#endif
return(true);
}
catch (Exception ex)
{
#if DEBUG
Console.WriteLine($"{ex}");
#endif
return(false);
}
return(true);
}
