public PiecePicker(IBtClient client, HandlerExchange exchange, IRequestStrategy requestStrategy, int blockLen, CancellationToken?cancelToken)
{
_pickerTask = new Task(StartRequesting);
_client = client;
_exchange = exchange;
RequestStrategy = requestStrategy;
_blockLen = blockLen;
_myCancelTokenOwner = new CancellationTokenSource();
_outCancelToken = cancelToken ?? _myCancelTokenOwner.Token;
}
public void StartAcceptingPeers(HandlerExchange handlerExchange)
{
if (_handlerExchange == null)
{
throw new ArgumentNullException("handlerExchange");
}
_handlerExchange = handlerExchange;
try {
_listener.Start();
_listenerTask.Start();
} catch (Exception e) {
Debug.WriteLine($"ConnectionHub: Listener task is dead, exception {e}");
}
}
/// <summary>
/// Creates new BtClient
/// </summary>
/// <param name="meta">Torrent metainfo</param>
/// <param name="clientEndPoint">Client's external network endpoint. Must be accessible by other peers</param>
/// <param name="defaultEncoding">Message text encoding</param>
/// <param name="output">Output stream. If torrent contains multiple files </param>
/// <param name="blockLen">Piece block length in bytes. 10^14 bytes if not specified</param>
/// <param name="fileName">File name to download. If not specified all files will be downloaded</param>
/// <param name="dhtEndPoint">Mainline DHT's client endpoint. DHT will not be used if parameter is null</param>
/// <param name="storage">Storage for caching pieces. If not specified MemCachedPieceStorage will be used</param>
/// <param name="cancelToken">Requesting cancel on this CancellationToken causes forcefull shutdown of client</param>
public BtClient(Metainfo meta, IPEndPoint clientEndPoint, Encoding defaultEncoding, Stream output, int blockLen = 16384, string fileName = null, PiecePickStrategy piecePickStrategy = PiecePickStrategy.RarestFirst, IPEndPoint dhtEndPoint = null, IPieceStorage storage = null, CancellationToken?cancelToken = null)
{
Metainfo = meta;
_endPoint = clientEndPoint;
DefaultEncoding = defaultEncoding;
_peerId = GeneratePeerId();
Handshake = CalcHandshake();
BlockLength = blockLen;
BlocksInPieceCount = Metainfo.PieceLength / BlockLength;
AnnounceManager = new AnnounceManager(this, Metainfo.Announces);
IResourcePool <Peers.Peer> peersPool = AnnounceManager;
if (dhtEndPoint != null)
{
MainlineManager = new MainlineManagerExt(clientEndPoint, dhtEndPoint, meta.InfoHash);
peersPool = new MergedPool <Peer>(new IResourcePool <Peer>[] {
AnnounceManager,
MainlineManager
});
}
if (storage == null)
{
storage = new FileStorage(Metainfo, BlockLength);
}
PieceStorage = storage;
BitField piecesHave = PieceStorage.GetValidPieces();
IRequestStrategy rqStrat = null;
switch (piecePickStrategy)
{
case PiecePickStrategy.RarestFirst:
RarestFirstRqStrategy rarestFirstRqStrategy = new RarestFirstRqStrategy(Metainfo.PiecesCount, piecesHave);
rqStrat = rarestFirstRqStrategy;
PeerStateCache = new PeerStateCache(rarestFirstRqStrategy);
break;
case PiecePickStrategy.Random:
rqStrat = new RandomPieceRqStrategy(Metainfo.PiecesCount, piecesHave);
break;
case PiecePickStrategy.Sequential:
rqStrat = new SequentialPieceRqStrategy(Metainfo.PiecesCount);
break;
case PiecePickStrategy.SequentialOneFile:
if (string.IsNullOrEmpty(fileName))
{
throw new ArgumentException("fileName");
}
rqStrat = new SequentialPieceRqStrategyOneFile(Metainfo, fileName);
break;
default:
break;
}
if (PeerStateCache == null)
{
PeerStateCache = new PeerStateCache();
}
ConnectionManager = new ConnectionHub(this, clientEndPoint, peersPool, PeerStateCache);
HandlerExchange = new HandlerExchange(ConnectionManager, PeerStateCache);
PiecePicker = new PiecePicker(this, HandlerExchange, rqStrat, BlockLength, cancelToken);
}