private Peer(Torrent torrent, string localId)
{
LocalId = localId;
Torrent = torrent;
LastActive = DateTime.UtcNow;
IsPieceDownloaded = new bool[Torrent.PieceCount];
IsBlockRequested = new bool[Torrent.PieceCount][];
for (int i = 0; i < Torrent.PieceCount; i++)
{
IsBlockRequested[i] = new bool[Torrent.GetBlockCount(i)];
}
}
private void ProcessDownloads()
{
if (Interlocked.Exchange(ref _isProcessDownloads, 1) == 1)
{
return;
}
while (_incomingBlocks.TryDequeue(out var incomingBlock))
{
Torrent.WriteBlock(incomingBlock.Piece, incomingBlock.Block, incomingBlock.Data);
}
if (Torrent.IsCompleted)
{
Interlocked.Exchange(ref _isProcessDownloads, 0);
return;
}
int[] ranked = GetRankedPieces();
foreach (var piece in ranked)
{
if (Torrent.IsPieceVerified[piece])
{
continue;
}
foreach (var peer in GetRankedSeeders())
{
if (!peer.IsPieceDownloaded[piece])
{
continue;
}
// just request blocks in order
for (int block = 0; block < Torrent.GetBlockCount(piece); block++)
{
if (_downloadThrottle.IsThrottled)
{
continue;
}
if (Torrent.IsBlockAcquired[piece][block])
{
continue;
}
// only request one block from each peer at a time
if (peer.BlocksRequested > 0)
{
continue;
}
// only request from 1 peer at a time
if (Peers.Count(x => x.Value.IsBlockRequested[piece][block]) > 0)
{
continue;
}
int size = Torrent.GetBlockSize(piece, block);
peer.SendRequest(piece, block * Torrent.BlockSize, size);
_downloadThrottle.Add(size);
peer.IsBlockRequested[piece][block] = true;
}
}
}
Interlocked.Exchange(ref _isProcessDownloads, 0);
}