public void AddToQueue(NetPacket packet)
{
lock (_outgoingPackets)
{
_outgoingPackets.Enqueue(packet);
}
}
public NetPacket GetAndClear()
{
var packet = Packet;
Packet = null;
TimeStamp = null;
return packet;
}
public void ProcessPacket(NetPacket packet)
{
if (NetUtils.RelativeSequenceNumber(packet.Sequence, _remoteSequence) > 0)
{
_remoteSequence = packet.Sequence;
_peer.AddIncomingPacket(packet);
}
}
internal void AddIncomingPacket(NetPacket p)
{
if (p.IsFragmented)
{
DebugWrite("Fragment. Id: {0}, Part: {1}, Total: {2}", p.FragmentId, p.FragmentPart, p.FragmentsTotal);
//Get needed array from dictionary
ushort packetFragId = p.FragmentId;
IncomingFragments incomingFragments;
if (!_holdedFragments.TryGetValue(packetFragId, out incomingFragments))
{
incomingFragments = new IncomingFragments
{
Fragments = new NetPacket[p.FragmentsTotal]
};
_holdedFragments.Add(packetFragId, incomingFragments);
}
//Cache
var fragments = incomingFragments.Fragments;
//Fill array
fragments[p.FragmentPart] = p;
//Increase received fragments count
incomingFragments.ReceivedCount++;
//Increase total size
int dataOffset = p.GetHeaderSize() + NetConstants.FragmentHeaderSize;
incomingFragments.TotalSize += p.RawData.Length - dataOffset;
//Check for finish
if (incomingFragments.ReceivedCount != fragments.Length)
return;
DebugWrite("Received all fragments!");
NetPacket resultingPacket = GetPacketFromPool(p.Property, incomingFragments.TotalSize);
int resultingPacketOffset = resultingPacket.GetHeaderSize();
int firstFragmentSize = fragments[0].RawData.Length - dataOffset;
for (int i = 0; i < incomingFragments.ReceivedCount; i++)
{
//Create resulting big packet
int fragmentSize = fragments[i].RawData.Length - dataOffset;
Buffer.BlockCopy(
fragments[i].RawData,
dataOffset,
resultingPacket.RawData,
resultingPacketOffset + firstFragmentSize * i,
fragmentSize);
//Free memory
Recycle(fragments[i]);
fragments[i] = null;
}
//Send to process
_peerListener.ReceiveFromPeer(resultingPacket, _remoteEndPoint);
//Clear memory
Recycle(resultingPacket);
_holdedFragments.Remove(packetFragId);
}
else //Just simple packet
{
_peerListener.ReceiveFromPeer(p, _remoteEndPoint);
Recycle(p);
}
}
private void ProcessMtuPacket(NetPacket packet)
{
if (packet.RawData.Length == 1 ||
packet.RawData[1] >= NetConstants.PossibleMtu.Length)
return;
//MTU auto increase
if (packet.Property == PacketProperty.MtuCheck)
{
if (packet.RawData.Length != NetConstants.PossibleMtu[packet.RawData[1]])
{
return;
}
_mtuCheckAttempts = 0;
DebugWrite("MTU check. Resend: " + packet.RawData[1]);
var mtuOkPacket = GetPacketFromPool(PacketProperty.MtuOk, 1);
mtuOkPacket.RawData[1] = packet.RawData[1];
SendPacket(mtuOkPacket);
}
else if(packet.RawData[1] > _mtuIdx) //MtuOk
{
lock (_mtuMutex)
{
_mtuIdx = packet.RawData[1];
_mtu = NetConstants.PossibleMtu[_mtuIdx];
}
//if maxed - finish.
if (_mtuIdx == NetConstants.PossibleMtu.Length - 1)
{
_finishMtu = true;
}
DebugWrite("MTU ok. Increase to: " + _mtu);
}
}
/// <summary>
/// Gets maximum size of packet that will be not fragmented.
/// </summary>
/// <param name="options">Type of packet that you want send</param>
/// <returns>size in bytes</returns>
public int GetMaxSinglePacketSize(DeliveryMethod options)
{
return(_mtu - NetPacket.GetHeaderSize(SendOptionsToProperty(options)));
}
internal void Recycle(NetPacket packet)
{
packet.RawData = null;
lock (_packetPool)
{
_packetPool.Push(packet);
}
}
/// <summary>
/// Send data to peer
/// </summary>
/// <param name="data">Data</param>
/// <param name="start">Start of data</param>
/// <param name="length">Length of data</param>
/// <param name="options">Send options (reliable, unreliable, etc.)</param>
/// <exception cref="TooBigPacketException">
/// If size exceeds maximum limit:<para/>
/// MTU - headerSize bytes for Unreliable<para/>
/// Fragment count exceeded ushort.MaxValue<para/>
/// </exception>
public void Send(byte[] data, int start, int length, DeliveryMethod options)
{
if (_connectionState == ConnectionState.ShutdownRequested ||
_connectionState == ConnectionState.Disconnected)
{
return;
}
//Prepare
PacketProperty property = SendOptionsToProperty(options);
NetUtils.DebugWrite("[RS]Packet: " + property);
//Select channel
BaseChannel channel;
switch (property)
{
case PacketProperty.ReliableUnordered:
channel = _reliableUnorderedChannel;
break;
case PacketProperty.Sequenced:
channel = _sequencedChannel;
break;
case PacketProperty.ReliableOrdered:
channel = _reliableOrderedChannel;
break;
case PacketProperty.Unreliable:
channel = _unreliableChannel;
break;
case PacketProperty.ReliableSequenced:
channel = _reliableSequencedChannel;
break;
default:
throw new InvalidPacketException("Unknown packet property: " + property);
}
//Check fragmentation
int headerSize = NetPacket.GetHeaderSize(property);
//Save mtu for multithread
int mtu = _mtu;
if (length + headerSize > mtu)
{
if (options == DeliveryMethod.Sequenced ||
options == DeliveryMethod.Unreliable ||
options == DeliveryMethod.ReliableSequenced)
{
throw new TooBigPacketException("Unreliable packet size exceeded maximum of " + (_mtu - headerSize) + " bytes");
}
int packetFullSize = mtu - headerSize;
int packetDataSize = packetFullSize - NetConstants.FragmentHeaderSize;
int fullPacketsCount = length / packetDataSize;
int lastPacketSize = length % packetDataSize;
int totalPackets = fullPacketsCount + (lastPacketSize == 0 ? 0 : 1);
NetUtils.DebugWrite("FragmentSend:\n" +
" MTU: {0}\n" +
" headerSize: {1}\n" +
" packetFullSize: {2}\n" +
" packetDataSize: {3}\n" +
" fullPacketsCount: {4}\n" +
" lastPacketSize: {5}\n" +
" totalPackets: {6}",
mtu, headerSize, packetFullSize, packetDataSize, fullPacketsCount, lastPacketSize, totalPackets);
if (totalPackets > ushort.MaxValue)
{
throw new TooBigPacketException("Data was split in " + totalPackets + " fragments, which exceeds " + ushort.MaxValue);
}
int dataOffset = headerSize + NetConstants.FragmentHeaderSize;
lock (_sendLock)
{
for (ushort i = 0; i < fullPacketsCount; i++)
{
NetPacket p = _packetPool.GetWithProperty(property, packetFullSize);
p.FragmentId = _fragmentId;
p.FragmentPart = i;
p.FragmentsTotal = (ushort)totalPackets;
p.MarkFragmented();
Buffer.BlockCopy(data, i * packetDataSize, p.RawData, dataOffset, packetDataSize);
channel.AddToQueue(p);
}
if (lastPacketSize > 0)
{
NetPacket p = _packetPool.GetWithProperty(property, lastPacketSize + NetConstants.FragmentHeaderSize);
p.FragmentId = _fragmentId;
p.FragmentPart = (ushort)fullPacketsCount; //last
p.FragmentsTotal = (ushort)totalPackets;
p.MarkFragmented();
Buffer.BlockCopy(data, fullPacketsCount * packetDataSize, p.RawData, dataOffset, lastPacketSize);
channel.AddToQueue(p);
}
_fragmentId++;
}
return;
}
//Else just send
NetPacket packet = _packetPool.GetWithData(property, data, start, length);
channel.AddToQueue(packet);
}
internal override void ReceiveFromPeer(NetPacket packet, NetEndPoint remoteEndPoint)
{
NetPeer fromPeer;
if (_peers.TryGetValue(remoteEndPoint, out fromPeer))
{
var netEvent = CreateEvent(NetEventType.Receive);
netEvent.Peer = fromPeer;
netEvent.RemoteEndPoint = fromPeer.EndPoint;
netEvent.DataReader.SetSource(packet.GetPacketData());
EnqueueEvent(netEvent);
}
}
//Process incoming packet
public void ProcessPacket(NetPacket packet)
{
if (packet.Sequence >= NetConstants.MaxSequence)
{
_peer.DebugWrite("[RR]Bad sequence");
return;
}
int relate = NetUtils.RelativeSequenceNumber(packet.Sequence, _remoteWindowStart);
int relateSeq = NetUtils.RelativeSequenceNumber(packet.Sequence, _remoteSequence);
if (relateSeq > _windowSize)
{
_peer.DebugWrite("[RR]Bad sequence");
return;
}
//Drop bad packets
if(relate < 0)
{
//Too old packet doesn't ack
_peer.DebugWrite("[RR]ReliableInOrder too old");
return;
}
if (relate >= _windowSize * 2)
{
//Some very new packet
_peer.DebugWrite("[RR]ReliableInOrder too new");
return;
}
//If very new - move window
Monitor.Enter(_outgoingAcksAccess);
if (relate >= _windowSize)
{
//New window position
int newWindowStart = (_remoteWindowStart + relate - _windowSize + 1) % NetConstants.MaxSequence;
//Clean old data
while (_remoteWindowStart != newWindowStart)
{
_outgoingAcks[_remoteWindowStart % _windowSize] = false;
_remoteWindowStart = (_remoteWindowStart + 1) % NetConstants.MaxSequence;
}
}
//Final stage - process valid packet
//trigger acks send
_mustSendAcks = true;
if (_outgoingAcks[packet.Sequence % _windowSize])
{
_peer.DebugWrite("[RR]ReliableInOrder duplicate");
Monitor.Exit(_outgoingAcksAccess);
return;
}
//save ack
_outgoingAcks[packet.Sequence % _windowSize] = true;
Monitor.Exit(_outgoingAcksAccess);
//detailed check
if (packet.Sequence == _remoteSequence)
{
_peer.DebugWrite("[RR]ReliableInOrder packet succes");
_peer.AddIncomingPacket(packet);
_remoteSequence = (_remoteSequence + 1) % NetConstants.MaxSequence;
if (_ordered)
{
NetPacket p;
while ( (p = _receivedPackets[_remoteSequence % _windowSize]) != null)
{
//process holded packet
_receivedPackets[_remoteSequence % _windowSize] = null;
_peer.AddIncomingPacket(p);
_remoteSequence = (_remoteSequence + 1) % NetConstants.MaxSequence;
}
}
else
{
while (_earlyReceived[_remoteSequence % _windowSize])
{
//process early packet
_earlyReceived[_remoteSequence % _windowSize] = false;
_remoteSequence = (_remoteSequence + 1) % NetConstants.MaxSequence;
}
}
return;
}
//holded packet
if (_ordered)
{
_receivedPackets[packet.Sequence % _windowSize] = packet;
}
else
{
_earlyReceived[packet.Sequence % _windowSize] = true;
_peer.AddIncomingPacket(packet);
}
}
//Process incoming packet
internal void ProcessPacket(NetPacket packet)
{
_timeSinceLastPacket = 0;
if (packet.ConnectionNumber != _connectNum &&
packet.Property != PacketProperty.ShutdownOk) //withou connectionNum
{
NetUtils.DebugWrite(ConsoleColor.Red, "[RR]Old packet");
_packetPool.Recycle(packet);
return;
}
NetUtils.DebugWrite("[RR]PacketProperty: {0}", packet.Property);
switch (packet.Property)
{
case PacketProperty.Merged:
int pos = NetConstants.HeaderSize;
while (pos < packet.Size)
{
ushort size = BitConverter.ToUInt16(packet.RawData, pos);
pos += 2;
NetPacket mergedPacket = _packetPool.GetPacket(size, false);
if (!mergedPacket.FromBytes(packet.RawData, pos, size))
{
_packetPool.Recycle(packet);
break;
}
pos += size;
ProcessPacket(mergedPacket);
}
break;
//If we get ping, send pong
case PacketProperty.Ping:
if (NetUtils.RelativeSequenceNumber(packet.Sequence, _remotePingSequence) < 0)
{
_packetPool.Recycle(packet);
break;
}
NetUtils.DebugWrite("[PP]Ping receive, send pong");
_remotePingSequence = packet.Sequence;
_packetPool.Recycle(packet);
//send
_pongPacket.Sequence = _remotePingSequence;
_netManager.SendRaw(_pongPacket, _remoteEndPoint);
break;
//If we get pong, calculate ping time and rtt
case PacketProperty.Pong:
if (NetUtils.RelativeSequenceNumber(packet.Sequence, _pingSequence) < 0)
{
_packetPool.Recycle(packet);
break;
}
_pingSequence = packet.Sequence;
int rtt = (int)(DateTime.UtcNow - _pingTimeStart).TotalMilliseconds;
UpdateRoundTripTime(rtt);
NetUtils.DebugWrite("[PP]Ping: {0}", rtt);
_packetPool.Recycle(packet);
break;
//Process ack
case PacketProperty.AckReliable:
_reliableUnorderedChannel.ProcessAck(packet);
_packetPool.Recycle(packet);
break;
case PacketProperty.AckReliableOrdered:
_reliableOrderedChannel.ProcessAck(packet);
_packetPool.Recycle(packet);
break;
//Process in order packets
case PacketProperty.Sequenced:
_sequencedChannel.ProcessPacket(packet);
break;
case PacketProperty.ReliableUnordered:
_reliableUnorderedChannel.ProcessPacket(packet);
break;
case PacketProperty.ReliableOrdered:
_reliableOrderedChannel.ProcessPacket(packet);
break;
case PacketProperty.ReliableSequenced:
_reliableSequencedChannel.ProcessPacket(packet);
break;
case PacketProperty.AckReliableSequenced:
_reliableSequencedChannel.ProcessAck(packet);
_packetPool.Recycle(packet);
break;
//Simple packet without acks
case PacketProperty.Unreliable:
AddIncomingPacket(packet);
return;
case PacketProperty.MtuCheck:
case PacketProperty.MtuOk:
ProcessMtuPacket(packet);
break;
case PacketProperty.ShutdownOk:
if (_connectionState == ConnectionState.ShutdownRequested)
{
_connectionState = ConnectionState.Disconnected;
}
_packetPool.Recycle(packet);
break;
default:
NetUtils.DebugWriteError("Error! Unexpected packet type: " + packet.Property);
break;
}
}
internal void Update(int deltaTime)
{
Interlocked.Add(ref _timeSinceLastPacket, deltaTime);
switch (_connectionState)
{
case ConnectionState.Connected:
if (_timeSinceLastPacket > NetManager.DisconnectTimeout)
{
NetDebug.Write(
"[UPDATE] Disconnect by timeout: {0} > {1}",
_timeSinceLastPacket,
NetManager.DisconnectTimeout);
NetManager.DisconnectPeerForce(this, DisconnectReason.Timeout, 0, null);
return;
}
break;
case ConnectionState.ShutdownRequested:
if (_timeSinceLastPacket > NetManager.DisconnectTimeout)
{
_connectionState = ConnectionState.Disconnected;
}
else
{
_shutdownTimer += deltaTime;
if (_shutdownTimer >= ShutdownDelay)
{
_shutdownTimer = 0;
NetManager.SendRaw(_shutdownPacket, EndPoint);
}
}
return;
case ConnectionState.Outgoing:
_connectTimer += deltaTime;
if (_connectTimer > NetManager.ReconnectDelay)
{
_connectTimer = 0;
_connectAttempts++;
if (_connectAttempts > NetManager.MaxConnectAttempts)
{
NetManager.DisconnectPeerForce(this, DisconnectReason.ConnectionFailed, 0, null);
return;
}
//else send connect again
NetManager.SendRaw(_connectRequestPacket, EndPoint);
}
return;
case ConnectionState.Disconnected:
return;
}
//Send ping
_pingSendTimer += deltaTime;
if (_pingSendTimer >= NetManager.PingInterval)
{
NetDebug.Write("[PP] Send ping...");
//reset timer
_pingSendTimer = 0;
//send ping
_pingPacket.Sequence++;
//ping timeout
if (_pingTimer.IsRunning)
{
UpdateRoundTripTime((int)_pingTimer.ElapsedMilliseconds);
}
_pingTimer.Reset();
_pingTimer.Start();
NetManager.SendRaw(_pingPacket, EndPoint);
}
//RTT - round trip time
_rttResetTimer += deltaTime;
if (_rttResetTimer >= NetManager.PingInterval * 3)
{
_rttResetTimer = 0;
_rtt = _avgRtt;
_rttCount = 1;
}
UpdateMtuLogic(deltaTime);
//Pending send
BaseChannel currentChannel = _headChannel;
while (currentChannel != null)
{
currentChannel.SendNextPackets();
currentChannel = currentChannel.Next;
}
lock (_unreliableChannel)
{
while (_unreliableChannel.Count > 0)
{
NetPacket packet = _unreliableChannel.Dequeue();
SendUserData(packet);
NetManager.NetPacketPool.Recycle(packet);
}
}
SendMerged();
}
/// <summary>
/// Gets maximum size of packet that will be not fragmented.
/// </summary>
/// <param name="options">Type of packet that you want send</param>
/// <returns>size in bytes</returns>
public int GetMaxSinglePacketSize(DeliveryMethod options)
{
return(_mtu - NetPacket.GetHeaderSize(options == DeliveryMethod.Unreliable ? PacketProperty.Unreliable : PacketProperty.Channeled));
}
//Process incoming packet
public override bool ProcessPacket(NetPacket packet)
{
if (packet.Property == PacketProperty.Ack)
{
ProcessAck(packet);
return(false);
}
int seq = packet.Sequence;
if (seq >= NetConstants.MaxSequence)
{
NetDebug.Write("[RR]Bad sequence");
return(false);
}
int relate = NetUtils.RelativeSequenceNumber(seq, _remoteWindowStart);
int relateSeq = NetUtils.RelativeSequenceNumber(seq, _remoteSequence);
if (relateSeq > _windowSize)
{
NetDebug.Write("[RR]Bad sequence");
return(false);
}
//Drop bad packets
if (relate < 0)
{
//Too old packet doesn't ack
NetDebug.Write("[RR]ReliableInOrder too old");
return(false);
}
if (relate >= _windowSize * 2)
{
//Some very new packet
NetDebug.Write("[RR]ReliableInOrder too new");
return(false);
}
//If very new - move window
int ackIdx;
int ackByte;
int ackBit;
lock (_outgoingAcks)
{
if (relate >= _windowSize)
{
//New window position
int newWindowStart = (_remoteWindowStart + relate - _windowSize + 1) % NetConstants.MaxSequence;
_outgoingAcks.Sequence = (ushort)newWindowStart;
//Clean old data
while (_remoteWindowStart != newWindowStart)
{
ackIdx = _remoteWindowStart % _windowSize;
ackByte = NetConstants.ChanneledHeaderSize + ackIdx / BitsInByte;
ackBit = ackIdx % BitsInByte;
_outgoingAcks.RawData[ackByte] &= (byte)~(1 << ackBit);
_remoteWindowStart = (_remoteWindowStart + 1) % NetConstants.MaxSequence;
}
}
//Final stage - process valid packet
//trigger acks send
_mustSendAcks = true;
ackIdx = seq % _windowSize;
ackByte = NetConstants.ChanneledHeaderSize + ackIdx / BitsInByte;
ackBit = ackIdx % BitsInByte;
if ((_outgoingAcks.RawData[ackByte] & (1 << ackBit)) != 0)
{
NetDebug.Write("[RR]ReliableInOrder duplicate");
return(false);
}
//save ack
_outgoingAcks.RawData[ackByte] |= (byte)(1 << ackBit);
}
//detailed check
if (seq == _remoteSequence)
{
NetDebug.Write("[RR]ReliableInOrder packet succes");
Peer.AddIncomingPacket(packet);
_remoteSequence = (_remoteSequence + 1) % NetConstants.MaxSequence;
if (_ordered)
{
NetPacket p;
while ((p = _receivedPackets[_remoteSequence % _windowSize]) != null)
{
//process holded packet
_receivedPackets[_remoteSequence % _windowSize] = null;
Peer.AddIncomingPacket(p);
_remoteSequence = (_remoteSequence + 1) % NetConstants.MaxSequence;
}
}
else
{
while (_earlyReceived[_remoteSequence % _windowSize])
{
//process early packet
_earlyReceived[_remoteSequence % _windowSize] = false;
_remoteSequence = (_remoteSequence + 1) % NetConstants.MaxSequence;
}
}
return(true);
}
//holded packet
if (_ordered)
{
_receivedPackets[ackIdx] = packet;
}
else
{
_earlyReceived[ackIdx] = true;
Peer.AddIncomingPacket(packet);
}
return(true);
}
public void Init(NetPacket packet)
{
_packet = packet;
_isSent = false;
}
//ProcessAck in packet
private void ProcessAck(NetPacket packet)
{
if (packet.Size != _outgoingAcks.Size)
{
NetDebug.Write("[PA]Invalid acks packet size");
return;
}
ushort ackWindowStart = packet.Sequence;
int windowRel = NetUtils.RelativeSequenceNumber(_localWindowStart, ackWindowStart);
if (ackWindowStart >= NetConstants.MaxSequence || windowRel < 0)
{
NetDebug.Write("[PA]Bad window start");
return;
}
//check relevance
if (windowRel >= _windowSize)
{
NetDebug.Write("[PA]Old acks");
return;
}
byte[] acksData = packet.RawData;
lock (_pendingPackets)
{
for (int pendingSeq = _localWindowStart;
pendingSeq != _localSeqence;
pendingSeq = (pendingSeq + 1) % NetConstants.MaxSequence)
{
int rel = NetUtils.RelativeSequenceNumber(pendingSeq, ackWindowStart);
if (rel >= _windowSize)
{
NetDebug.Write("[PA]REL: " + rel);
break;
}
int pendingIdx = pendingSeq % _windowSize;
int currentByte = NetConstants.ChanneledHeaderSize + pendingIdx / BitsInByte;
int currentBit = pendingIdx % BitsInByte;
if ((acksData[currentByte] & (1 << currentBit)) == 0)
{
#if STATS_ENABLED || DEBUG
Peer.Statistics.PacketLoss++;
#endif
//Skip false ack
NetDebug.Write("[PA]False ack: {0}", pendingSeq);
continue;
}
if (pendingSeq == _localWindowStart)
{
//Move window
_localWindowStart = (_localWindowStart + 1) % NetConstants.MaxSequence;
}
//clear packet
if (_pendingPackets[pendingIdx].Clear(Peer))
{
NetDebug.Write("[PA]Removing reliableInOrder ack: {0} - true", pendingSeq);
}
}
}
}
//Process incoming packet
internal void ProcessPacket(NetPacket packet)
{
_lastPacketReceivedStart = DateTime.UtcNow;
DebugWrite("[RR]PacketProperty: {0}", packet.Property);
switch (packet.Property)
{
case PacketProperty.Merged:
int pos = NetConstants.HeaderSize;
while (pos < packet.RawData.Length)
{
ushort size = BitConverter.ToUInt16(packet.RawData, pos);
pos += 2;
NetPacket mergedPacket = GetPacketFromPool(init: false);
if (!mergedPacket.FromBytes(packet.RawData, pos, size))
{
Recycle(packet);
break;
}
pos += size;
ProcessPacket(mergedPacket);
}
break;
//If we get ping, send pong
case PacketProperty.Ping:
if (NetUtils.RelativeSequenceNumber(packet.Sequence, _remotePingSequence) < 0)
{
Recycle(packet);
break;
}
DebugWrite("[PP]Ping receive, send pong");
_remotePingSequence = packet.Sequence;
Recycle(packet);
//send
CreateAndSend(PacketProperty.Pong, _remotePingSequence);
break;
//If we get pong, calculate ping time and rtt
case PacketProperty.Pong:
if (NetUtils.RelativeSequenceNumber(packet.Sequence, _pingSequence) < 0)
{
Recycle(packet);
break;
}
_pingSequence = packet.Sequence;
int rtt = (int)(DateTime.UtcNow - _pingTimeStart).TotalMilliseconds;
UpdateRoundTripTime(rtt);
DebugWrite("[PP]Ping: {0}", rtt);
Recycle(packet);
break;
//Process ack
case PacketProperty.AckReliable:
_reliableUnorderedChannel.ProcessAck(packet);
Recycle(packet);
break;
case PacketProperty.AckReliableOrdered:
_reliableOrderedChannel.ProcessAck(packet);
Recycle(packet);
break;
//Process in order packets
case PacketProperty.Sequenced:
_sequencedChannel.ProcessPacket(packet);
break;
case PacketProperty.Reliable:
_reliableUnorderedChannel.ProcessPacket(packet);
break;
case PacketProperty.ReliableOrdered:
_reliableOrderedChannel.ProcessPacket(packet);
break;
//Simple packet without acks
case PacketProperty.Unreliable:
AddIncomingPacket(packet);
return;
case PacketProperty.MtuCheck:
case PacketProperty.MtuOk:
ProcessMtuPacket(packet);
break;
default:
DebugWriteForce("Error! Unexpected packet type: " + packet.Property);
break;
}
}
internal abstract void ReceiveFromPeer(NetPacket packet, NetEndPoint endPoint);
private void SendInternal(
byte[] data,
int start,
int length,
byte channelNumber,
DeliveryMethod deliveryMethod,
object userData)
{
if (_connectionState != ConnectionState.Connected || channelNumber >= _channels.Length)
{
return;
}
//Select channel
PacketProperty property;
BaseChannel channel = null;
if (deliveryMethod == DeliveryMethod.Unreliable)
{
property = PacketProperty.Unreliable;
}
else
{
property = PacketProperty.Channeled;
channel = CreateChannel((byte)(channelNumber * 4 + (byte)deliveryMethod));
}
//Prepare
NetDebug.Write("[RS]Packet: " + property);
//Check fragmentation
int headerSize = NetPacket.GetHeaderSize(property);
//Save mtu for multithread
int mtu = _mtu;
if (length + headerSize > mtu)
{
//if cannot be fragmented
if (deliveryMethod != DeliveryMethod.ReliableOrdered && deliveryMethod != DeliveryMethod.ReliableUnordered)
{
throw new TooBigPacketException("Unreliable packet size exceeded maximum of " + (mtu - headerSize) + " bytes");
}
int packetFullSize = mtu - headerSize;
int packetDataSize = packetFullSize - NetConstants.FragmentHeaderSize;
int totalPackets = length / packetDataSize + (length % packetDataSize == 0 ? 0 : 1);
NetDebug.Write("FragmentSend:\n" +
" MTU: {0}\n" +
" headerSize: {1}\n" +
" packetFullSize: {2}\n" +
" packetDataSize: {3}\n" +
" totalPackets: {4}",
mtu, headerSize, packetFullSize, packetDataSize, totalPackets);
if (totalPackets > ushort.MaxValue)
{
throw new TooBigPacketException("Data was split in " + totalPackets + " fragments, which exceeds " + ushort.MaxValue);
}
ushort currentFragmentId = (ushort)Interlocked.Increment(ref _fragmentId);
for (ushort partIdx = 0; partIdx < totalPackets; partIdx++)
{
int sendLength = length > packetDataSize ? packetDataSize : length;
NetPacket p = _packetPool.GetPacket(headerSize + sendLength + NetConstants.FragmentHeaderSize);
p.Property = property;
p.UserData = userData;
p.FragmentId = currentFragmentId;
p.FragmentPart = partIdx;
p.FragmentsTotal = (ushort)totalPackets;
p.MarkFragmented();
Buffer.BlockCopy(data, partIdx * packetDataSize, p.RawData, NetConstants.FragmentedHeaderTotalSize, sendLength);
channel.AddToQueue(p);
length -= sendLength;
}
return;
}
//Else just send
NetPacket packet = _packetPool.GetPacket(headerSize + length);
packet.Property = property;
Buffer.BlockCopy(data, start, packet.RawData, headerSize, length);
packet.UserData = userData;
if (channel == null) //unreliable
{
lock (_unreliableChannel)
_unreliableChannel.Enqueue(packet);
}
else
{
channel.AddToQueue(packet);
}
}
internal void AddIncomingPacket(NetPacket p)
{
if (p.IsFragmented)
{
NetUtils.DebugWrite("Fragment. Id: {0}, Part: {1}, Total: {2}", p.FragmentId, p.FragmentPart, p.FragmentsTotal);
//Get needed array from dictionary
ushort packetFragId = p.FragmentId;
IncomingFragments incomingFragments;
if (!_holdedFragments.TryGetValue(packetFragId, out incomingFragments))
{
incomingFragments = new IncomingFragments
{
Fragments = new NetPacket[p.FragmentsTotal]
};
_holdedFragments.Add(packetFragId, incomingFragments);
}
//Cache
var fragments = incomingFragments.Fragments;
//Error check
if (p.FragmentPart >= fragments.Length || fragments[p.FragmentPart] != null)
{
_packetPool.Recycle(p);
NetUtils.DebugWriteError("Invalid fragment packet");
return;
}
//Fill array
fragments[p.FragmentPart] = p;
//Increase received fragments count
incomingFragments.ReceivedCount++;
//Increase total size
int dataOffset = p.GetHeaderSize() + NetConstants.FragmentHeaderSize;
incomingFragments.TotalSize += p.Size - dataOffset;
//Check for finish
if (incomingFragments.ReceivedCount != fragments.Length)
{
return;
}
NetUtils.DebugWrite("Received all fragments!");
NetPacket resultingPacket = _packetPool.GetWithProperty(p.Property, incomingFragments.TotalSize);
int resultingPacketOffset = resultingPacket.GetHeaderSize();
int firstFragmentSize = fragments[0].Size - dataOffset;
for (int i = 0; i < incomingFragments.ReceivedCount; i++)
{
//Create resulting big packet
int fragmentSize = fragments[i].Size - dataOffset;
Buffer.BlockCopy(
fragments[i].RawData,
dataOffset,
resultingPacket.RawData,
resultingPacketOffset + firstFragmentSize * i,
fragmentSize);
//Free memory
_packetPool.Recycle(fragments[i]);
fragments[i] = null;
}
//Send to process
_netManager.ReceiveFromPeer(resultingPacket, _remoteEndPoint);
//Clear memory
_holdedFragments.Remove(packetFragId);
}
else //Just simple packet
{
_netManager.ReceiveFromPeer(p, _remoteEndPoint);
}
}
//ProcessAck in packet
public void ProcessAck(NetPacket packet)
{
int validPacketSize = (_windowSize - 1) / BitsInByte + 1 + NetConstants.SequencedHeaderSize;
if (packet.RawData.Length != validPacketSize)
{
_peer.DebugWriteForce("[PA]Invalid acks packet size");
return;
}
ushort ackWindowStart = packet.Sequence;
if (ackWindowStart > NetConstants.MaxSequence)
{
_peer.DebugWrite("[PA]Bad window start");
return;
}
//check relevance
if (NetUtils.RelativeSequenceNumber(ackWindowStart, _localWindowStart) <= -_windowSize)
{
_peer.DebugWrite("[PA]Old acks");
return;
}
byte[] acksData = packet.RawData;
_peer.DebugWrite("[PA]AcksStart: {0}", ackWindowStart);
int startByte = NetConstants.SequencedHeaderSize;
Monitor.Enter(_pendingPacketsAccess);
for (int i = 0; i < _windowSize; i++)
{
int ackSequence = (ackWindowStart + i) % NetConstants.MaxSequence;
if (NetUtils.RelativeSequenceNumber(ackSequence, _localWindowStart) < 0)
{
//Skip old ack
continue;
}
int currentByte = startByte + i / BitsInByte;
int currentBit = i % BitsInByte;
if ((acksData[currentByte] & (1 << currentBit)) == 0)
{
//Skip false ack
continue;
}
if (ackSequence == _localWindowStart)
{
//Move window
_localWindowStart = (_localWindowStart + 1) % NetConstants.MaxSequence;
}
int storeIdx = ackSequence % _windowSize;
if (_pendingPackets[storeIdx].NotEmpty)
{
NetPacket removed = _pendingPackets[storeIdx].GetAndClear();
_peer.Recycle(removed);
_peer.DebugWrite("[PA]Removing reliableInOrder ack: {0} - true", ackSequence);
}
else
{
_peer.DebugWrite("[PA]Removing reliableInOrder ack: {0} - false", ackSequence);
}
}
Monitor.Exit(_pendingPacketsAccess);
}
internal void AddReliablePacket(DeliveryMethod method, NetPacket p)
{
if (p.IsFragmented)
{
NetDebug.Write("Fragment. Id: {0}, Part: {1}, Total: {2}", p.FragmentId, p.FragmentPart, p.FragmentsTotal);
//Get needed array from dictionary
ushort packetFragId = p.FragmentId;
IncomingFragments incomingFragments;
if (!_holdedFragments.TryGetValue(packetFragId, out incomingFragments))
{
incomingFragments = new IncomingFragments
{
Fragments = new NetPacket[p.FragmentsTotal],
ChannelId = p.ChannelId
};
_holdedFragments.Add(packetFragId, incomingFragments);
}
//Cache
var fragments = incomingFragments.Fragments;
//Error check
if (p.FragmentPart >= fragments.Length ||
fragments[p.FragmentPart] != null ||
p.ChannelId != incomingFragments.ChannelId)
{
_packetPool.Recycle(p);
NetDebug.WriteError("Invalid fragment packet");
return;
}
//Fill array
fragments[p.FragmentPart] = p;
//Increase received fragments count
incomingFragments.ReceivedCount++;
//Increase total size
incomingFragments.TotalSize += p.Size - NetConstants.FragmentedHeaderTotalSize;
//Check for finish
if (incomingFragments.ReceivedCount != fragments.Length)
{
return;
}
//just simple packet
NetPacket resultingPacket = _packetPool.GetPacket(incomingFragments.TotalSize);
int firstFragmentSize = fragments[0].Size - NetConstants.FragmentedHeaderTotalSize;
for (int i = 0; i < incomingFragments.ReceivedCount; i++)
{
var fragment = fragments[i];
//Create resulting big packet
Buffer.BlockCopy(
fragment.RawData,
NetConstants.FragmentedHeaderTotalSize,
resultingPacket.RawData,
firstFragmentSize * i,
fragment.Size - NetConstants.FragmentedHeaderTotalSize);
//Free memory
_packetPool.Recycle(fragment);
}
Array.Clear(fragments, 0, incomingFragments.ReceivedCount);
//Send to process
NetManager.CreateReceiveEvent(resultingPacket, method, 0, this);
//Clear memory
_holdedFragments.Remove(packetFragId);
}
else //Just simple packet
{
NetManager.CreateReceiveEvent(p, method, NetConstants.ChanneledHeaderSize, this);
}
}
internal override void ReceiveFromPeer(NetPacket packet, NetEndPoint remoteEndPoint)
{
NetUtils.DebugWrite(ConsoleColor.Cyan, "[NC] Received message");
var netEvent = CreateEvent(NetEventType.Receive);
netEvent.DataReader.SetSource(packet.GetPacketData());
netEvent.Peer = _peer;
netEvent.RemoteEndPoint = remoteEndPoint;
EnqueueEvent(netEvent);
}
//Process incoming packet
internal void ProcessPacket(NetPacket packet)
{
//not initialized
if (_connectionState == ConnectionState.Outgoing || _connectionState == ConnectionState.Disconnected)
{
_packetPool.Recycle(packet);
return;
}
if (packet.Property == PacketProperty.ShutdownOk)
{
if (_connectionState == ConnectionState.ShutdownRequested)
{
_connectionState = ConnectionState.Disconnected;
}
_packetPool.Recycle(packet);
return;
}
if (packet.ConnectionNumber != _connectNum)
{
NetDebug.Write(NetLogLevel.Trace, "[RR]Old packet");
_packetPool.Recycle(packet);
return;
}
Interlocked.Exchange(ref _timeSinceLastPacket, 0);
NetDebug.Write("[RR]PacketProperty: {0}", packet.Property);
switch (packet.Property)
{
case PacketProperty.Merged:
int pos = NetConstants.HeaderSize;
while (pos < packet.Size)
{
ushort size = BitConverter.ToUInt16(packet.RawData, pos);
pos += 2;
NetPacket mergedPacket = _packetPool.GetPacket(size);
if (!mergedPacket.FromBytes(packet.RawData, pos, size))
{
_packetPool.Recycle(packet);
break;
}
pos += size;
ProcessPacket(mergedPacket);
}
break;
//If we get ping, send pong
case PacketProperty.Ping:
if (NetUtils.RelativeSequenceNumber(packet.Sequence, _pongPacket.Sequence) > 0)
{
NetDebug.Write("[PP]Ping receive, send pong");
FastBitConverter.GetBytes(_pongPacket.RawData, 3, DateTime.UtcNow.Ticks);
_pongPacket.Sequence = packet.Sequence;
NetManager.SendRaw(_pongPacket, EndPoint);
}
_packetPool.Recycle(packet);
break;
//If we get pong, calculate ping time and rtt
case PacketProperty.Pong:
if (packet.Sequence == _pingPacket.Sequence)
{
_pingTimer.Stop();
int elapsedMs = (int)_pingTimer.ElapsedMilliseconds;
_remoteDelta = BitConverter.ToInt64(packet.RawData, 3) + (elapsedMs * TimeSpan.TicksPerMillisecond) / 2 - DateTime.UtcNow.Ticks;
UpdateRoundTripTime(elapsedMs);
NetManager.ConnectionLatencyUpdated(this, elapsedMs / 2);
NetDebug.Write("[PP]Ping: {0} - {1} - {2}", packet.Sequence, elapsedMs, _remoteDelta);
}
_packetPool.Recycle(packet);
break;
case PacketProperty.Ack:
case PacketProperty.Channeled:
if (packet.ChannelId > _channels.Length)
{
_packetPool.Recycle(packet);
break;
}
var channel = _channels[packet.ChannelId] ?? (packet.Property == PacketProperty.Ack ? null : CreateChannel(packet.ChannelId));
if (channel != null)
{
if (!channel.ProcessPacket(packet))
{
_packetPool.Recycle(packet);
}
}
break;
//Simple packet without acks
case PacketProperty.Unreliable:
NetManager.CreateReceiveEvent(packet, DeliveryMethod.Unreliable, NetConstants.HeaderSize, this);
return;
case PacketProperty.MtuCheck:
case PacketProperty.MtuOk:
ProcessMtuPacket(packet);
break;
default:
NetDebug.WriteError("Error! Unexpected packet type: " + packet.Property);
break;
}
}
//from user thread, our thread, or recv?
private void SendPacket(NetPacket packet)
{
switch (packet.Property)
{
case PacketProperty.Reliable:
DebugWrite("[RS]Packet reliable");
_reliableUnorderedChannel.AddToQueue(packet);
break;
case PacketProperty.Sequenced:
DebugWrite("[RS]Packet sequenced");
_sequencedChannel.AddToQueue(packet);
break;
case PacketProperty.ReliableOrdered:
DebugWrite("[RS]Packet reliable ordered");
_reliableOrderedChannel.AddToQueue(packet);
break;
case PacketProperty.Unreliable:
DebugWrite("[RS]Packet simple");
_simpleChannel.AddToQueue(packet);
break;
case PacketProperty.MtuCheck:
//Must check result for MTU fix
if (!_peerListener.SendRaw(packet.RawData, 0, packet.RawData.Length, _remoteEndPoint))
{
_finishMtu = true;
}
Recycle(packet);
break;
case PacketProperty.AckReliable:
case PacketProperty.AckReliableOrdered:
case PacketProperty.Ping:
case PacketProperty.Pong:
case PacketProperty.Disconnect:
case PacketProperty.MtuOk:
SendRawData(packet.RawData);
Recycle(packet);
break;
default:
throw new Exception("Unknown packet property: " + packet.Property);
}
}
internal NetPacket GetPacketFromPool(PacketProperty property = PacketProperty.Unreliable, int size=0, bool init=true)
{
NetPacket packet = null;
lock (_packetPool)
{
if (_packetPool.Count > 0)
{
packet = _packetPool.Pop();
}
}
if(packet == null)
{
packet = new NetPacket();
}
if(init)
packet.Init(property, size);
return packet;
}
protected override void ReceiveFromSocket(byte[] reusableBuffer, int count, NetEndPoint remoteEndPoint)
{
NetPacket packet;
NetPeer netPeer;
//Check peers
if (_peers.TryGetValue(remoteEndPoint, out netPeer))
{
packet = netPeer.GetPacketFromPool(init: false);
//Bad packet check
if (!packet.FromBytes(reusableBuffer, 0, count))
{
netPeer.Recycle(packet);
return;
}
//Send
if (packet.Property == PacketProperty.Disconnect)
{
if (BitConverter.ToUInt64(packet.RawData, 1) != _peerConnectionIds[remoteEndPoint])
{
//Old or incorrect disconnect
netPeer.Recycle(packet);
return;
}
RemovePeer(netPeer);
var netEvent = CreateEvent(NetEventType.Disconnect);
netEvent.Peer = netPeer;
netEvent.DisconnectReason = DisconnectReason.RemoteConnectionClose;
EnqueueEvent(netEvent);
}
else if (packet.Property == PacketProperty.ConnectRequest) //response with connect
{
ulong lastId = _peerConnectionIds[remoteEndPoint];
ulong newId = BitConverter.ToUInt64(packet.RawData, 1);
if (newId > lastId)
{
_peerConnectionIds[remoteEndPoint] = newId;
}
NetUtils.DebugWrite(ConsoleColor.Cyan, "ConnectRequest LastId: {0}, NewId: {1}, EP: {2}", lastId, newId, remoteEndPoint);
SendConnectAccept(netPeer, _peerConnectionIds[remoteEndPoint]);
netPeer.Recycle(packet);
}
else //throw out garbage packets
{
netPeer.ProcessPacket(packet);
}
return;
}
//Else add new peer
packet = new NetPacket();
if (!packet.FromBytes(reusableBuffer, 0, count))
{
//Bad packet
return;
}
if (_peers.Count < _maxClients && packet.Property == PacketProperty.ConnectRequest)
{
string peerKey = Encoding.UTF8.GetString(packet.RawData, 9, packet.RawData.Length - 9);
if (peerKey != _connectKey)
{
NetUtils.DebugWrite(ConsoleColor.Cyan, "[NS] Peer connect reject. Invalid key: " + peerKey);
return;
}
//Getting new id for peer
netPeer = CreatePeer(remoteEndPoint);
//response with id
ulong connectionId = BitConverter.ToUInt64(packet.RawData, 1);
NetUtils.DebugWrite(ConsoleColor.Cyan, "[NS] Received peer connect request Id: {0}, EP: {1}", connectionId, remoteEndPoint);
SendConnectAccept(netPeer, connectionId);
//clean incoming packet
netPeer.Recycle(packet);
lock (_peers)
{
_peers.Add(remoteEndPoint, netPeer);
_peerConnectionIds.Add(remoteEndPoint, connectionId);
}
var netEvent = CreateEvent(NetEventType.Connect);
netEvent.Peer = netPeer;
EnqueueEvent(netEvent);
}
}
//For channels
internal void Recycle(NetPacket packet)
{
_packetPool.Recycle(packet);
}
