public bool ProcessPacket(NetPacket packet)
{
if (packet.IsFragmented)
{
return(false);
}
if (packet.Property == PacketProperty.Ack)
{
if (_reliable && _lastPacket != null && packet.Sequence == _lastPacket.Sequence)
{
_lastPacket = null;
}
return(false);
}
int relative = NetUtil.RelativeSequenceNumber(packet.Sequence, _remoteSequence);
bool packetProcessed = false;
if (packet.Sequence < NetPacket.MaxSequence && relative > 0)
{
if (_reliable)
{
Interlocked.Add(ref _statistic.UdpPacketLossCount, (relative - 1));
}
_remoteSequence = packet.Sequence;
_udpChannel.PacketReceived?.Invoke(_udpChannel, packet);
packetProcessed = true;
}
_mustSendAck = true;
return(packetProcessed);
}
internal void OnReceivedRawUdpData(byte[] data, int size, NetPacket cachedPacket, SocketError error, IPEndPoint endPoint)
{
//Console.WriteLine($"buffer size : {size} packet size : {BitConverter.ToUInt16(data, 0)}");
if (size < NetPacket.HeaderSize)
return;
try
{
PacketProperty property = cachedPacket.Property;
DeliveryMethod deliveryMethod = cachedPacket.DeliveryMethod;
switch (property)
{
case PacketProperty.MtuCheck:
{
NetPacket packet = NetPool.PacketPool.Alloc(NetPacket.GetHeaderSize(PacketProperty.MtuOk));
try
{
byte getMtuId = data[3];
packet.Property = PacketProperty.MtuOk;
packet.DeliveryMethod = DeliveryMethod.Unreliable;
packet.RawData[3] = getMtuId;
SendTo(packet.RawData, 0, packet.Size, SendMode.Immediately);
}
catch (Exception ex)
{
_logger.LogError(ex, "Exception happened in MtuCheck");
}
finally
{
NetPool.PacketPool.Free(packet);
}
}
break;
case PacketProperty.MtuOk:
{
try
{
byte getMtuId = data[3];
if (getMtuId >= _mtuId)
{
_mtuId = getMtuId;
_mtu = NetPacket.PossibleMtu[getMtuId];
if (_mtuId >= NetPacket.PossibleMtu.Length)
_finishMtu = true;
//Console.WriteLine($"SetMtu : {_mtu}");
}
}
catch (Exception ex)
{
_logger.LogError(ex, "Exception happened in MtuOk");
}
}
break;
case PacketProperty.Ping:
{
ushort sequence = BitConverter.ToUInt16(data, 3);
if (NetUtil.RelativeSequenceNumber(sequence, _pongPacket.Sequence) > 0)
{
FastBitConverter.GetBytes(_pongPacket.RawData, 5, DateTime.UtcNow.Ticks);
_pongPacket.Sequence = sequence;
SendTo(_pongPacket.RawData, 0, _pongPacket.Size, SendMode.Immediately);
}
}
break;
case PacketProperty.Pong:
{
ushort sequence = BitConverter.ToUInt16(data, 3);
if (sequence == _pingPacket.Sequence)
{
_pingTimer.Stop();
int elapsedMs = (int)_pingTimer.ElapsedMilliseconds;
_remoteTickDelta = BitConverter.ToInt64(data, 5) + (elapsedMs * TimeSpan.TicksPerMillisecond) / 2 - DateTime.UtcNow.Ticks;
UpdateRoundTripTime(elapsedMs);
//Console.WriteLine($"Pong sequence : {sequence} {elapsedMs} ms {_remoteTickDelta} microseconds");
}
}
break;
default:
{
ReadPacket(data, size, _channelOption.PacketFilter);
}
break;
}
}
catch (Exception e)
{
_logger.LogError(e, "Exception happened in OnReceivedRawUdpData");
Close();
}
}
public bool ProcessPacket(NetPacket poolingPacket)
{
if (poolingPacket.Property == PacketProperty.Ack)
{
try
{
ProcessAck(poolingPacket);
}
finally
{
NetPool.PacketPool.Free(poolingPacket);
}
return(false);
}
int seq = poolingPacket.Sequence;
if (seq >= NetPacket.MaxSequence)
{
#if RELIABLE_LOG
Console.WriteLine($"rudp bad sequence {seq}");
#endif
return(false);
}
int relate = NetUtil.RelativeSequenceNumber(seq, _remoteWindowStart);
int relateSeq = NetUtil.RelativeSequenceNumber(seq, _remoteSequence);
if (relateSeq > WindowSize)
{
#if RELIABLE_LOG
Console.WriteLine($"rudp bad relative sequence {relateSeq}");
#endif
return(false);
}
if (relate < 0)
{
// 너무 오래된 패킷임
#if RELIABLE_LOG
Console.WriteLine($"rudp ReliableInOrder too old");
#endif
return(false);
}
if (relate >= WindowSize * 2)
{
// 너무 새로운 패킷임
#if RELIABLE_LOG
Console.WriteLine($"rudp ReliableInOrder too new");
#endif
return(false);
}
int ackIdx;
int ackByte;
int ackBit;
// 응답패킷 데이터를 태우자
lock (_ackPacket)
{
if (relate >= WindowSize)
{
int newWindowStart = (_remoteWindowStart + relate - WindowSize + 1) % NetPacket.MaxSequence;
_ackPacket.Sequence = (ushort)newWindowStart;
// 예전 데이터를 정리
while (_remoteWindowStart != newWindowStart)
{
ackIdx = _remoteWindowStart % WindowSize;
ackByte = NetPacket.UserDataHeaderSize + ackIdx / BitsInByte;
ackBit = ackIdx % BitsInByte;
_ackPacket.RawData[ackByte] &= (byte)~(1 << ackBit);
_remoteWindowStart = (_remoteWindowStart + 1) % NetPacket.MaxSequence;
}
}
_sendAcks = true;
ackIdx = seq % WindowSize;
ackByte = NetPacket.UserDataHeaderSize + ackIdx / BitsInByte;
ackBit = ackIdx % BitsInByte;
if ((_ackPacket.RawData[ackByte] & (1 << ackBit)) != 0)
{
#if RELIABLE_LOG
Console.WriteLine($"rudp ReliableInOrder duplicate");
#endif
NetPool.PacketPool.Free(poolingPacket);
return(false);
}
_ackPacket.RawData[ackByte] |= (byte)(1 << ackBit);
}
if (seq == _remoteSequence)
{
_udpChannel.PacketReceived?.Invoke(_udpChannel, poolingPacket);
_remoteSequence = (_remoteSequence + 1) % NetPacket.MaxSequence;
if (_ordered)
{
NetPacket p;
while ((p = _receivedPackets[_remoteSequence % WindowSize]) != null)
{
_receivedPackets[_remoteSequence % WindowSize] = null;
_udpChannel.PacketReceived?.Invoke(_udpChannel, p);
_remoteSequence = (_remoteSequence + 1) % NetPacket.MaxSequence;
}
}
else
{
while (_earlyReceived[_remoteSequence % WindowSize])
{
_earlyReceived[_remoteSequence % WindowSize] = false;
_remoteSequence = (_remoteSequence + 1) % NetPacket.MaxSequence;
}
}
return(true);
}
if (_ordered)
{
_receivedPackets[ackIdx] = poolingPacket;
}
else
{
_earlyReceived[ackIdx] = true;
_udpChannel.PacketReceived?.Invoke(_udpChannel, poolingPacket);
}
return(true);
}
private void ProcessAck(NetPacket packet)
{
if (packet.Size != _ackPacket.Size)
{
#if RELIABLE_LOG
Console.WriteLine("rudp Invalid acks packet size");
#endif
return;
}
byte[] acksData = packet.RawData;
lock (_pendingPackets)
{
ushort ackWindowStart = packet.Sequence;
int windowRel = NetUtil.RelativeSequenceNumber(_localWindowStart, ackWindowStart);
if (ackWindowStart >= NetPacket.MaxSequence || windowRel < 0)
{
#if RELIABLE_LOG
Console.WriteLine($"rudp Bad window start {ackWindowStart} {windowRel}");
#endif
return;
}
if (windowRel >= WindowSize)
{
#if RELIABLE_LOG
Console.WriteLine("rudp Old acks");
#endif
return;
}
for (int pendingSeq = _localWindowStart;
pendingSeq != _localSequence;
pendingSeq = (pendingSeq + 1) % NetPacket.MaxSequence)
{
int rel = NetUtil.RelativeSequenceNumber(pendingSeq, ackWindowStart);
if (rel >= WindowSize)
{
#if RELIABLE_LOG
Console.WriteLine($"[PA]REL: {rel} {pendingSeq} {_localSequence} {ackWindowStart}");
#endif
break;
}
int pendingIdx = pendingSeq % WindowSize;
int currentByte = NetPacket.UserDataHeaderSize + pendingIdx / BitsInByte;
int currentBit = pendingIdx % BitsInByte;
if ((acksData[currentByte] & (1 << currentBit)) == 0)
{
Interlocked.Increment(ref _statistic.UdpPacketLossCount);
#if RELIABLE_LOG
Console.WriteLine($"[PA]False ack: {pendingSeq}");
#endif
continue;
}
if (pendingSeq == _localWindowStart)
{
_localWindowStart = (_localWindowStart + 1) % NetPacket.MaxSequence;
}
#if RELIABLE_LOG
Console.WriteLine($"ProcessAck End Id : {pendingIdx}");
#endif
_pendingPackets[pendingIdx].Clear();
}
}
}
public bool SendPendingPacket()
{
// 응답패킷을 보내야 한다면
if (_sendAcks == true)
{
// lock에 비용이 많이드므로 먼저 체크한번 하고 나중에 또 체크하자
lock (_ackPacket)
{
if (_sendAcks == true)
{
_sendAcks = false;
IPacketFilter filter = _channelOption.PacketFilter;
if (filter != null)
{
var poolingPacket = NetPool.PacketPool.Alloc(_ackPacket, 0);
try
{
while (filter != null)
{
poolingPacket = filter.Encode(poolingPacket);
filter = filter.NextFilter;
}
_udpChannel.SendTo(poolingPacket.RawData, 0, poolingPacket.Size, UdpChannel.SendMode.Buffered);
}
finally
{
NetPool.PacketPool.Free(poolingPacket);
}
}
else
{
_udpChannel.SendTo(_ackPacket.RawData, 0, _ackPacket.Size, UdpChannel.SendMode.Buffered);
}
}
}
}
lock (_pendingPackets)
{
long nowTicks = DateTime.UtcNow.Ticks;
lock (_sendQueue)
{
while (_sendQueue.Count > 0)
{
int relate = NetUtil.RelativeSequenceNumber(_localSequence, _localWindowStart);
if (relate >= WindowSize)
{
break;
}
NetPacket packet = _sendQueue.Dequeue();
packet.Sequence = (ushort)_localSequence;
_pendingPackets[_localSequence % WindowSize].Init(packet, nowTicks);
_localSequence = (_localSequence + 1) % NetPacket.MaxSequence;
}
}
for (int pendingSeq = _localWindowStart; pendingSeq != _localSequence; pendingSeq = (pendingSeq + 1) % NetPacket.MaxSequence)
{
if (_pendingPackets[pendingSeq % WindowSize].TrySend(
nowTicks,
_channelOption.RudpDisconnectTimeout,
_udpChannel,
_statistic) == false)
{
return(false);
}
}
}
return(true);
}
