/// <summary>
/// Sends a message, but notify when it is delivered or lost
/// </summary>
/// <typeparam name="T">type of message to send</typeparam>
/// <param name="msg">message to send</param>
/// <param name="token">a arbitrary object that the sender will receive with their notification</param>
public void SendNotify <T>(T msg, object token, byte channelId = (byte)Channels.Unreliable)
{
if (sendWindow.Count == WINDOW_SIZE)
{
NotifyLost?.Invoke(this, token);
return;
}
using (PooledNetworkWriter writer = NetworkWriterPool.GetWriter())
{
var notifyPacket = new NotifyPacket
{
Sequence = (ushort)sequencer.Next(),
ReceiveSequence = receiveSequence,
AckMask = receiveMask
};
sendWindow.Enqueue(new PacketEnvelope
{
Sequence = notifyPacket.Sequence,
Token = token
});
MessagePacker.Pack(notifyPacket, writer);
MessagePacker.Pack(msg, writer);
NetworkDiagnostics.OnSend(msg, channelId, writer.Length, 1);
SendAsync(writer.ToArraySegment(), channelId).Forget();
}
}
internal void ReceiveNotify(NotifyPacket notifyPacket, NetworkReader networkReader, int channelId)
{
int sequenceDistance = (int)sequencer.Distance(notifyPacket.Sequence, receiveSequence);
// sequence is so far out of bounds we can't save, just kick him (or her!)
if (Math.Abs(sequenceDistance) > WINDOW_SIZE)
{
Disconnect();
return;
}
// this message is old, we already received
// a newer or duplicate packet. Discard it
if (sequenceDistance <= 0)
{
return;
}
receiveSequence = notifyPacket.Sequence;
if (sequenceDistance >= ACK_MASK_BITS)
{
receiveMask = 1;
}
else
{
receiveMask = (receiveMask << sequenceDistance) | 1;
}
AckPackets(notifyPacket.ReceiveSequence, notifyPacket.AckMask);
int msgType = MessagePacker.UnpackId(networkReader);
InvokeHandler(msgType, networkReader, channelId);
}
// note: original HLAPI HandleBytes function handled >1 message in a while loop, but this wasn't necessary
// anymore because NetworkServer/NetworkClient Update both use while loops to handle >1 data events per
// frame already.
// -> in other words, we always receive 1 message per Receive call, never two.
// -> can be tested easily with a 1000ms send delay and then logging amount received in while loops here
// and in NetworkServer/Client Update. HandleBytes already takes exactly one.
/// <summary>
/// This function allows custom network connection classes to process data from the network before it is passed to the application.
/// </summary>
/// <param name="buffer">The data received.</param>
internal void TransportReceive(ArraySegment <byte> buffer, int channelId)
{
// unpack message
using (PooledNetworkReader networkReader = NetworkReaderPool.GetReader(buffer))
{
try
{
int msgType = MessagePacker.UnpackId(networkReader);
if (msgType == MessagePacker.GetId <NotifyPacket>())
{
// this is a notify message, send to the notify receive
NotifyPacket notifyPacket = networkReader.ReadNotifyPacket();
ReceiveNotify(notifyPacket, networkReader, channelId);
}
else
{
// try to invoke the handler for that message
InvokeHandler(msgType, networkReader, channelId);
}
}
catch (InvalidDataException ex)
{
logger.Log(ex.ToString());
}
catch (Exception ex)
{
logger.LogError("Closed connection: " + this + ". Invalid message " + ex);
Disconnect();
}
}
}