/// <summary>
/// Process any piece requests in buffer and send to remote peer.
/// </summary>
/// <param name="cancelTask"></param>
/// <returns></returns>
private void PieceRequestProcessing(CancellationToken cancelTask)
{
try
{
Log.Logger.Info("Piece request processing task started...");
while (true)
{
Peer remotePeer = null;
PieceRequest request = pieceRequestQueue.Take(cancelTask);
try
{
Log.Logger.Info($"Piece Reqeuest {request.pieceNumber} {request.blockOffset} {request.blockSize}.");
if (_manager.GetPeer(request.infoHash, request.ip, out remotePeer))
{
PieceBuffer requestBuffer = GetPieceFromTorrent(remotePeer, request.pieceNumber);
byte[] requestBlock = new byte[request.blockSize];
Array.Copy(requestBuffer.Buffer, (Int32)request.blockOffset, requestBlock, 0, (Int32)request.blockSize);
PWP.Piece(remotePeer, request.pieceNumber, request.blockOffset, requestBlock);
remotePeer.Tc.TotalBytesUploaded += request.blockSize;
}
}
catch (Exception ex)
{
Log.Logger.Error(ex);
// Remote peer most probably closed socket so close connection
remotePeer?.Close();
}
}
}
catch (Exception ex)
{
Log.Logger.Debug(ex);
}
Log.Logger.Info("Piece request processing task terminated.");
}
/// <summary>
/// Request piece blocks from passed in peer list.
/// </summary>
/// <param name="tc"></param>
/// <param name="pieceNumber"></param>
/// <param name="remotePeers"></param>
/// <param name="stopwatch"></param>
private bool GetMoreBlocks(TorrentContext tc, UInt32 pieceNumber, Peer[] remotePeers)
{
bool success = true;
tc.assemblyData.guardMutex.WaitOne();
try
{
UInt32 blockOffset = 0;
int currentPeer = 0;
tc.assemblyData.currentBlockRequests = 0;
foreach (var blockThere in tc.assemblyData.pieceBuffer.BlocksPresent)
{
if (!blockThere)
{
PWP.Request(remotePeers[currentPeer], pieceNumber, blockOffset, Math.Min(Constants.BlockSize, tc.GetPieceLength(pieceNumber) - blockOffset));
remotePeers[currentPeer].OutstandingRequestsCount++;
if (++tc.assemblyData.currentBlockRequests == _maximumBlockRequests)
{
break;
}
currentPeer = (currentPeer + 1) % (int)remotePeers.Length;
}
blockOffset += Constants.BlockSize;
}
}
catch (Exception ex)
{
Log.Logger.Error(ex);
success = false;
}
tc.assemblyData.guardMutex.ReleaseMutex();
return(success);
}
/// <summary>
/// Perform intial handsake with remote peer.
/// </summary>
/// <param name="manager"></param>
public void Handshake(Manager manager)
{
if (manager is null)
{
throw new ArgumentNullException(nameof(manager));
}
RemotePeerID = PWP.Handshake(this, manager);
Connected = true;
_network.StartReads(this);
PWP.Bitfield(this, Tc.Bitfield);
}
private readonly int _maximumBlockRequests; // Maximum requests at a time
/// <summary>
/// Signal to all peers in swarm that we now have the piece local so
/// that they can request it if they need.
/// </summary>
/// <param name="tc"></param>
/// <param name="pieceNumber"></param>
private void SignalHaveToSwarm(TorrentContext tc, UInt32 pieceNumber)
{
foreach (var remotePeer in tc.peerSwarm.Values)
{
try
{
PWP.Have(remotePeer, pieceNumber);
}
catch (Exception ex)
{
Log.Logger.Error(ex);
remotePeer.Close();
}
}
}
/// <summary>
// Wait and process remote peer requests until cancelled.
/// </summary>
/// <param name="tc"></param>
/// <param name="cancelTask"></param>
private void ProcessRemotePeerRequests(TorrentContext tc, CancellationToken cancelAssemblerTask)
{
WaitHandle[] waitHandles = new WaitHandle[] { cancelAssemblerTask.WaitHandle };
foreach (var remotePeer in tc.peerSwarm.Values)
{
try
{
PWP.Uninterested(remotePeer);
PWP.Unchoke(remotePeer);
}
catch (Exception ex)
{
Log.Logger.Error(ex);
remotePeer.Close();
}
}
WaitHandle.WaitAll(waitHandles);
}