void SendAck(RudpPacket packet)
{
RudpPacket ack = new RudpPacket();
ack.TargetID = Session.UserID;
ack.TargetClient = Session.ClientID;
ack.PeerID = RemotePeerID;
ack.PacketType = RudpPacketType.Ack;
ack.Sequence = packet.Sequence;
ack.Payload = RudpAck.Encode(HighestSeqRecvd, (byte)(MAX_WINDOW_SIZE - RecvPacketMap.Count));
ack.Ident = packet.Ident;
//Session.Log("Ack Sent, Seq " + ack.Sequence.ToString() + ", ID " + ack.PeerID.ToString() + ", highest " + HighestSeqRecvd.ToString());
if (!AckMap.Contains(ack.Sequence))
{
AckMap[ack.Sequence] = true;
AckOrder.Enqueue(ack.Sequence);
}
while (AckMap.Count > MAX_WINDOW_SIZE * 2)
{
AckMap.Remove(AckOrder.Dequeue());
}
SendTracked(new TrackPacket(ack));
}
void ReceiveAck(RudpPacket packet)
{
int latency = 0;
int retries = -1;
// find original packet that was sent
TrackPacket sent = null;
lock (SendSection)
{
foreach (TrackPacket tracked in SendPacketMap)
{
if (tracked.Packet.Sequence == packet.Sequence)
{
sent = tracked;
break;
}
}
}
// mark packet as acked
if (sent != null)
{
sent.Target.LastAck = Core.TimeNow;
// connect handshake
if (State == RudpState.Connecting && sent.Packet.PacketType == RudpPacketType.Syn)
{
SynAckReceieved = true;
SetPrimaryAddress(packet.Ident);
if (SynAckSent && SynAckReceieved)
{
Session.Log("Connected (recv ack)");
ChangeState(RudpState.Connected);
SetConnected();
// if data packets received before final connection ack, process them now
ManageRecvWindow();
}
}
if (!sent.Acked)
{
InOrderAcks++;
if (sent.Retries == 0)
{
latency = (int)sent.TimeEllapsed(Core);
latency = latency < 5 ? 5 : latency;
AvgLatency.Input(latency);
AvgLatency.Next();
}
}
retries = sent.Retries;
sent.Acked = true;
}
RudpAck ack = new RudpAck(packet.Payload);
//Session.Log("Ack Recv, Seq " + packet.Sequence.ToString() + ", ID " + packet.PeerID.ToString() + ", highest " + ack.Start.ToString() + ", retries " + retries.ToString() + ", latency " + latency.ToString());
lock (SendSection)
{
// ack possibly un-acked packets
foreach (TrackPacket tracked in SendPacketMap)
{
// ack if start past the zero boundry with sequences behind
if (tracked.Packet.Sequence > 0xFF - 25 && ack.Start < 25)
{
tracked.Acked = true;
}
// break start before boundry and sequences ahead are not recvd/acked yet
if (ack.Start > 0xFF - 25 && tracked.Packet.Sequence < 25)
{
break;
}
// normal acking procedure
else if (ack.Start >= tracked.Packet.Sequence)
{
tracked.Acked = true;
}
else
{
break;
}
}
// remove acked, only remove packets from front
while (SendPacketMap.Count > 0 && SendPacketMap.Peek().Acked)
{
// calculate receive speed of remote host by rate they ack
AvgBytesSent.Input(SendPacketMap.Peek().Packet.Payload.Length);
SendPacketMap.Dequeue();
PacketsCompleted++;
}
}
// increase window if packets removed from beginning of buffer
//if(packetsRemoved && SendWindowSize < 25)
// SendWindowSize++;
ManageSendWindow();
}
