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($"{ex}");
#endif
return(false);
}
return(true);
}
public void DownloadFileMultipleSession(string input, string output, string customMessage = "", int threads = 1, CancellationToken token = new CancellationToken())
{
downloadThread = threads;
downloadPartialToken = token;
downloadPartialInputPath = input;
downloadPartialOutputPath = output;
OnCompleted(new DownloadProgressCompleted()
{
DownloadCompleted = false
});
downloadPartialSize = GetContentLength(downloadPartialInputPath) ?? 0;
long startContent, endContent;
segmentDownloadTask = new List <Task>();
segmentDownloadProperties = new List <SegmentDownloadProperties>();
List <ChunkRanges> chunkRanges = new List <ChunkRanges>();
long partitionSize = (long)Math.Ceiling((double)downloadPartialSize / downloadThread);
for (int i = 0; i < downloadThread; i++)
{
startContent = i * (downloadPartialSize / downloadThread);
endContent = i + 1 == downloadThread ? downloadPartialSize : ((i + 1) * (downloadPartialSize / downloadThread)) - 1;
segmentDownloadProperties.Add(new SegmentDownloadProperties(0, 0, 0, 0)
{
CurrentReceived = 0, StartRange = startContent, EndRange = endContent, PartRange = i
});
}
OnResumabilityChanged(new DownloadStatusChanged(true));
#if DEBUG
Console.WriteLine($"\r\nStarting Partial Download!\r\n\tTotal Size: {BpUtility.ToBytesCount(downloadPartialSize)} ({downloadPartialSize} bytes)\r\n\tThreads/Chunks: {downloadThread}");
#endif
Status = ParallelHttpClientStatus.Downloading;
try
{
foreach (SegmentDownloadProperties j in segmentDownloadProperties)
{
segmentDownloadTask.Add(Task.Run(async() =>
{
while (!await GetPartialSessionStream(j))
{
#if DEBUG
Console.WriteLine($"Retrying to connect for chunk no: {j.PartRange + 1}...");
#endif
Thread.Sleep(1000);
}
}, downloadPartialToken));
}
Task.Run(() => GetPartialDownloadEvents());
Task.WhenAll(segmentDownloadTask).GetAwaiter().GetResult();
}
catch (Exception ex)
{
#if DEBUG
Console.WriteLine($"{ex}");
#endif
}
if (!downloadPartialToken.IsCancellationRequested)
{
try
{
MergePartialChunks();
}
catch (OperationCanceledException ex)
{
#if DEBUG
Console.WriteLine("Merging cancelled!");
#endif
throw new OperationCanceledException("", ex);
}
}
else
{
segmentDownloadTask.Clear();
#if DEBUG
Console.WriteLine("Download cancelled!");
#endif
throw new OperationCanceledException();
}
segmentDownloadTask.Clear();
#if DEBUG
Console.WriteLine(" Done!");
#endif
Status = ParallelHttpClientStatus.Idle;
}