private void Receive()
{
ClientState = ClientState.Listening;
while (true)
{
try
{
_tokenSource.Token.ThrowIfCancellationRequested();
IPEndPoint endPoint = null;
byte[] buffer = _client.Receive(ref endPoint);
IPacket packet = _packetFactory.GetPacket(buffer[0]);
packet.Decode(buffer);
if (packet is ConnectionRequestPacket connectionRequestPacket)
{
int mtu = connectionRequestPacket.Padding.Length + 77;
Send(endPoint, new ConnectionResponsePacket((ushort)mtu));
if (!_sessions.ContainsKey(endPoint))
{
_sessions[endPoint] = new ReliabilityUdpClientSession(endPoint, (ushort)mtu, this,
_receiveCustomDataPacketCallback);
}
}
else if (packet is ConnectionResponsePacket connectionEstablishmentPacket)
{
if (_sessions.ContainsKey(endPoint))
{
throw new InvalidPacketException("Now connected.");
}
_sessions[endPoint] =
new ReliabilityUdpClientSession(endPoint, connectionEstablishmentPacket.MtuSize, this,
_receiveCustomDataPacketCallback);
_connectionCallback?.Invoke(new ConnectionData(endPoint,
connectionEstablishmentPacket.MtuSize));
_sessions[endPoint].SendPacket(new ConnectionEstablishmentPacket());
}
else if (packet is DataPacket dataPacket)
{
if (_sessions.ContainsKey(endPoint))
{
_sessions[endPoint].OnReceive(dataPacket);
}
}
else if (packet is NackPacket nackPacket)
{
if (_sessions.ContainsKey(endPoint))
{
_sessions[endPoint].OnNack(nackPacket);
}
}
else if (packet is AckPacket ackPacket)
{
if (_sessions.ContainsKey(endPoint))
{
_sessions[endPoint].OnAck(ackPacket);
}
}
}
catch (Exception e)
{
Console.WriteLine(e);
}
}
}
