// remoteWindowStart is remote expected sequence number; everything below this has arrived properly
// seqNr is the actual nr received
internal override void ReceiveAcknowledge(double now, int seqNr)
{
// late (dupe), on time or early ack?
int relate = NetUtility.RelativeSequenceNumber(seqNr, m_windowStart);
if (relate < 0)
{
//m_connection.m_peer.LogDebug("Received late/dupe ack for #" + seqNr);
return; // late/duplicate ack
}
if (relate == 0)
{
//m_connection.m_peer.LogDebug("Received right-on-time ack for #" + seqNr);
// ack arrived right on time
NetException.Assert(seqNr == m_windowStart);
bool resetTimeout;
m_receivedAcks[m_windowStart] = false;
DestoreMessage(now, m_windowStart % m_windowSize, out resetTimeout);
m_windowStart = (m_windowStart + 1) % NetConstants.NumSequenceNumbers;
// advance window if we already have early acks
while (m_receivedAcks.Get(m_windowStart))
{
//m_connection.m_peer.LogDebug("Using early ack for #" + m_windowStart + "...");
m_receivedAcks[m_windowStart] = false;
bool rt;
DestoreMessage(now, m_windowStart % m_windowSize, out rt);
resetTimeout |= rt;
NetException.Assert(m_storedMessages[m_windowStart % m_windowSize].Message == null); // should already be destored
m_windowStart = (m_windowStart + 1) % NetConstants.NumSequenceNumbers;
//m_connection.m_peer.LogDebug("Advancing window to #" + m_windowStart);
}
if (resetTimeout)
{
m_connection.ResetTimeout(now);
}
return;
}
//
// early ack... (if it has been sent!)
//
// If it has been sent either the m_windowStart message was lost
// ... or the ack for that message was lost
//
//m_connection.m_peer.LogDebug("Received early ack for #" + seqNr);
int sendRelate = NetUtility.RelativeSequenceNumber(seqNr, m_sendStart);
if (sendRelate <= 0)
{
// yes, we've sent this message - it's an early (but valid) ack
if (m_receivedAcks[seqNr])
{
// we've already destored/been acked for this message
}
else
{
m_receivedAcks[seqNr] = true;
}
}
else if (sendRelate > 0)
{
// uh... we haven't sent this message yet? Weird, dupe or error...
NetException.Assert(false, "Got ack for message not yet sent?");
return;
}
// Ok, lets resend all missing acks
int rnr = seqNr;
do
{
rnr--;
if (rnr < 0)
{
rnr = NetConstants.NumSequenceNumbers - 1;
}
if (m_receivedAcks[rnr])
{
// m_connection.m_peer.LogDebug("Not resending #" + rnr + " (since we got ack)");
}
else
{
int slot = rnr % m_windowSize;
NetException.Assert(m_storedMessages[slot].Message != null);
if (m_storedMessages[slot].NumSent == 1)
{
// just sent once; resend immediately since we found gap in ack sequence
NetOutgoingMessage rmsg = m_storedMessages[slot].Message;
//m_connection.m_peer.LogVerbose("Resending #" + rnr + " (" + rmsg + ")");
if (now - m_storedMessages[slot].LastSent < (m_resendDelay * 0.35))
{
// already resent recently
}
else
{
m_storedMessages[slot].LastSent = now;
m_storedMessages[slot].NumSent++;
m_connection.m_statistics.MessageResent(MessageResendReason.HoleInSequence);
Interlocked.Increment(ref rmsg.m_recyclingCount); // increment this since it's being decremented in QueueSendMessage
m_connection.QueueSendMessage(rmsg, rnr);
}
}
}
} while (rnr != m_windowStart);
}
// on user thread
private NetSendResult SendFragmentedMessage(NetOutgoingMessage msg, IList <NetConnection> recipients, NetDeliveryMethod method, int sequenceChannel)
{
// Note: this group id is PER SENDING/NetPeer; ie. same id is sent to all recipients;
// this should be ok however; as long as recipients differentiate between same id but different sender
int group = Interlocked.Increment(ref m_lastUsedFragmentGroup);
if (group >= NetConstants.MaxFragmentationGroups)
{
// @TODO: not thread safe; but in practice probably not an issue
m_lastUsedFragmentGroup = 1;
group = 1;
}
msg.m_fragmentGroup = group;
// do not send msg; but set fragmentgroup in case user tries to recycle it immediately
// create fragmentation specifics
int totalBytes = msg.LengthBytes;
// determine minimum mtu for all recipients
int mtu = GetMTU(recipients);
int bytesPerChunk = NetFragmentationHelper.GetBestChunkSize(group, totalBytes, mtu);
int numChunks = totalBytes / bytesPerChunk;
if (numChunks * bytesPerChunk < totalBytes)
{
numChunks++;
}
NetSendResult retval = NetSendResult.Sent;
int bitsPerChunk = bytesPerChunk * 8;
int bitsLeft = msg.LengthBits;
for (int i = 0; i < numChunks; i++)
{
NetOutgoingMessage chunk = CreateMessage(0);
chunk.m_bitLength = (bitsLeft > bitsPerChunk ? bitsPerChunk : bitsLeft);
chunk.m_data = msg.m_data;
chunk.m_fragmentGroup = group;
chunk.m_fragmentGroupTotalBits = totalBytes * 8;
chunk.m_fragmentChunkByteSize = bytesPerChunk;
chunk.m_fragmentChunkNumber = i;
NetException.Assert(chunk.m_bitLength != 0);
NetException.Assert(chunk.GetEncodedSize() < mtu);
Interlocked.Add(ref chunk.m_recyclingCount, recipients.Count);
foreach (NetConnection recipient in recipients)
{
var res = recipient.EnqueueMessage(chunk, method, sequenceChannel);
if (res == NetSendResult.Dropped)
{
Interlocked.Decrement(ref chunk.m_recyclingCount);
}
if ((int)res > (int)retval)
{
retval = res; // return "worst" result
}
}
bitsLeft -= bitsPerChunk;
}
return(retval);
}
private void HandleReleasedFragment(NetIncomingMessage im)
{
VerifyNetworkThread();
//
// read fragmentation header and combine fragments
//
int group;
int totalBits;
int chunkByteSize;
int chunkNumber;
int ptr = NetFragmentationHelper.ReadHeader(
im.m_data, 0,
out group,
out totalBits,
out chunkByteSize,
out chunkNumber
);
NetException.Assert(im.LengthBytes > ptr);
NetException.Assert(group > 0);
NetException.Assert(totalBits > 0);
NetException.Assert(chunkByteSize > 0);
int totalBytes = NetUtility.BytesToHoldBits((int)totalBits);
int totalNumChunks = totalBytes / chunkByteSize;
if (totalNumChunks * chunkByteSize < totalBytes)
{
totalNumChunks++;
}
NetException.Assert(chunkNumber < totalNumChunks);
if (chunkNumber >= totalNumChunks)
{
LogWarning("Index out of bounds for chunk " + chunkNumber + " (total chunks " + totalNumChunks + ")");
return;
}
Dictionary <int, ReceivedFragmentGroup> groups;
if (!m_receivedFragmentGroups.TryGetValue(im.SenderConnection, out groups))
{
groups = new Dictionary <int, ReceivedFragmentGroup>();
m_receivedFragmentGroups[im.SenderConnection] = groups;
}
ReceivedFragmentGroup info;
if (!groups.TryGetValue(group, out info))
{
info = new ReceivedFragmentGroup();
info.Data = new byte[totalBytes];
info.ReceivedChunks = new NetBitVector(totalNumChunks);
groups[group] = info;
}
info.ReceivedChunks[chunkNumber] = true;
//info.LastReceived = (float)NetTime.Now;
// copy to data
int offset = (chunkNumber * chunkByteSize);
Buffer.BlockCopy(im.m_data, ptr, info.Data, offset, im.LengthBytes - ptr);
int cnt = info.ReceivedChunks.Count();
//LogVerbose("Found fragment #" + chunkNumber + " in group " + group + " offset " + offset + " of total bits " + totalBits + " (total chunks done " + cnt + ")");
LogVerbose("Received fragment " + chunkNumber + " of " + totalNumChunks + " (" + cnt + " chunks received)");
if (info.ReceivedChunks.Count() == totalNumChunks)
{
// Done! Transform this incoming message
im.m_data = info.Data;
im.m_bitLength = (int)totalBits;
im.m_isFragment = false;
LogVerbose("Fragment group #" + group + " fully received in " + totalNumChunks + " chunks (" + totalBits + " bits)");
groups.Remove(group);
ReleaseMessage(im);
}
else
{
// data has been copied; recycle this incoming message
Recycle(im);
}
return;
}
private void SendCallBack(IAsyncResult res)
{
NetException.Assert(res.IsCompleted == true);
m_socket.EndSendTo(res);
}
internal void Heartbeat(float now, uint frameCounter)
{
m_peer.VerifyNetworkThread();
NetException.Assert(m_status != NetConnectionStatus.InitiatedConnect && m_status != NetConnectionStatus.RespondedConnect);
if ((frameCounter % m_infrequentEventsSkipFrames) == 0)
{
if (now > m_timeoutDeadline)
{
//
// connection timed out
//
m_peer.LogVerbose("Connection timed out at " + now + " deadline was " + m_timeoutDeadline);
ExecuteDisconnect("Connection timed out", true);
return;
}
// send ping?
if (m_status == NetConnectionStatus.Connected)
{
if (now > m_sentPingTime + m_peer.m_configuration.m_pingInterval)
{
SendPing();
}
// handle expand mtu
MTUExpansionHeartbeat(now);
}
if (m_disconnectRequested)
{
ExecuteDisconnect(m_disconnectMessage, m_disconnectReqSendBye);
return;
}
}
bool connectionReset; // TODO: handle connection reset
//
// Note: at this point m_sendBufferWritePtr and m_sendBufferNumMessages may be non-null; resends may already be queued up
//
byte[] sendBuffer = m_peer.m_sendBuffer;
int mtu = m_currentMTU;
if ((frameCounter % m_messageCoalesceFrames) == 0) // coalesce a few frames
{
//
// send ack messages
//
while (m_queuedOutgoingAcks.Count > 0)
{
int acks = (mtu - (m_sendBufferWritePtr + 5)) / 3; // 3 bytes per actual ack
if (acks > m_queuedOutgoingAcks.Count)
{
acks = m_queuedOutgoingAcks.Count;
}
NetException.Assert(acks > 0);
m_sendBufferNumMessages++;
// write acks header
sendBuffer[m_sendBufferWritePtr++] = (byte)NetMessageType.Acknowledge;
sendBuffer[m_sendBufferWritePtr++] = 0; // no sequence number
sendBuffer[m_sendBufferWritePtr++] = 0; // no sequence number
int len = (acks * 3) * 8; // bits
sendBuffer[m_sendBufferWritePtr++] = (byte)len;
sendBuffer[m_sendBufferWritePtr++] = (byte)(len >> 8);
// write acks
for (int i = 0; i < acks; i++)
{
NetTuple <NetMessageType, int> tuple;
m_queuedOutgoingAcks.TryDequeue(out tuple);
//m_peer.LogVerbose("Sending ack for " + tuple.Item1 + "#" + tuple.Item2);
sendBuffer[m_sendBufferWritePtr++] = (byte)tuple.Item1;
sendBuffer[m_sendBufferWritePtr++] = (byte)tuple.Item2;
sendBuffer[m_sendBufferWritePtr++] = (byte)(tuple.Item2 >> 8);
}
if (m_queuedOutgoingAcks.Count > 0)
{
// send packet and go for another round of acks
NetException.Assert(m_sendBufferWritePtr > 0 && m_sendBufferNumMessages > 0);
m_peer.SendPacket(m_sendBufferWritePtr, m_remoteEndPoint, m_sendBufferNumMessages, out connectionReset);
m_statistics.PacketSent(m_sendBufferWritePtr, 1);
m_sendBufferWritePtr = 0;
m_sendBufferNumMessages = 0;
}
}
//
// Parse incoming acks (may trigger resends)
//
NetTuple <NetMessageType, int> incAck;
while (m_queuedIncomingAcks.TryDequeue(out incAck))
{
//m_peer.LogVerbose("Received ack for " + acktp + "#" + seqNr);
NetSenderChannelBase chan = m_sendChannels[(int)incAck.Item1 - 1];
// If we haven't sent a message on this channel there is no reason to ack it
if (chan == null)
{
continue;
}
chan.ReceiveAcknowledge(now, incAck.Item2);
}
}
//
// send queued messages
//
if (m_peer.m_executeFlushSendQueue)
{
for (int i = m_sendChannels.Length - 1; i >= 0; i--) // Reverse order so reliable messages are sent first
{
var channel = m_sendChannels[i];
NetException.Assert(m_sendBufferWritePtr < 1 || m_sendBufferNumMessages > 0);
if (channel != null)
{
channel.SendQueuedMessages(now);
}
NetException.Assert(m_sendBufferWritePtr < 1 || m_sendBufferNumMessages > 0);
}
}
//
// Put on wire data has been written to send buffer but not yet sent
//
if (m_sendBufferWritePtr > 0)
{
m_peer.VerifyNetworkThread();
NetException.Assert(m_sendBufferWritePtr > 0 && m_sendBufferNumMessages > 0);
m_peer.SendPacket(m_sendBufferWritePtr, m_remoteEndPoint, m_sendBufferNumMessages, out connectionReset);
m_statistics.PacketSent(m_sendBufferWritePtr, m_sendBufferNumMessages);
m_sendBufferWritePtr = 0;
m_sendBufferNumMessages = 0;
}
}
private void Heartbeat()
{
VerifyNetworkThread();
double dnow = NetTime.Now;
float now = (float)dnow;
double delta = dnow - m_lastHeartbeat;
int maxCHBpS = 1250 - m_connections.Count;
if (maxCHBpS < 250)
{
maxCHBpS = 250;
}
if (delta > (1.0 / (double)maxCHBpS)) // max connection heartbeats/second max
{
m_frameCounter++;
m_lastHeartbeat = dnow;
// do handshake heartbeats
if ((m_frameCounter % 3) == 0)
{
foreach (NetConnection conn in m_handshakes.Values)
{
conn.UnconnectedHeartbeat(now);
if (conn.m_status == NetConnectionStatus.Connected || conn.m_status == NetConnectionStatus.Disconnected)
{
break; // collection has been modified
}
}
}
#if DEBUG
SendDelayedPackets();
#endif
// do connection heartbeats
lock (m_connections)
{
foreach (NetConnection conn in m_connections)
{
conn.Heartbeat(now, m_frameCounter);
if (conn.m_status == NetConnectionStatus.Disconnected)
{
//
// remove connection
//
m_connections.Remove(conn);
m_connectionLookup.Remove(conn.RemoteEndpoint);
break; // can't continue iteration here
}
}
}
// send unsent unconnected messages
NetTuple <IPEndPoint, NetOutgoingMessage> unsent;
while (m_unsentUnconnectedMessages.TryDequeue(out unsent))
{
NetOutgoingMessage om = unsent.Item2;
bool connReset;
int len = om.Encode(m_sendBuffer, 0, 0);
SendPacket(len, unsent.Item1, 1, out connReset);
Interlocked.Decrement(ref om.m_recyclingCount);
if (om.m_recyclingCount <= 0)
{
Recycle(om);
}
}
}
//
// read from socket
//
if (m_socket == null)
{
return;
}
if (!m_socket.Poll(1000, SelectMode.SelectRead)) // wait up to 1 ms for data to arrive
{
return;
}
//if (m_socket == null || m_socket.Available < 1)
// return;
int bytesReceived = 0;
try
{
bytesReceived = m_socket.ReceiveFrom(m_receiveBuffer, 0, m_receiveBuffer.Length, SocketFlags.None, ref m_senderRemote);
}
catch (SocketException sx)
{
if (sx.SocketErrorCode == SocketError.ConnectionReset)
{
// connection reset by peer, aka connection forcibly closed aka "ICMP port unreachable"
// we should shut down the connection; but m_senderRemote seemingly cannot be trusted, so which connection should we shut down?!
// So, what to do?
return;
}
LogWarning(sx.ToString());
return;
}
if (bytesReceived < NetConstants.HeaderByteSize)
{
return;
}
//LogVerbose("Received " + bytesReceived + " bytes");
IPEndPoint ipsender = (IPEndPoint)m_senderRemote;
NetConnection sender = null;
m_connectionLookup.TryGetValue(ipsender, out sender);
//
// parse packet into messages
//
int ptr = 0;
while ((bytesReceived - ptr) >= NetConstants.HeaderByteSize)
{
// decode header
// 8 bits - NetMessageType
// 1 bit - Fragment?
// 15 bits - Sequence number
// 16 bits - Payload length in bits
NetMessageType tp = (NetMessageType)m_receiveBuffer[ptr++];
byte low = m_receiveBuffer[ptr++];
byte high = m_receiveBuffer[ptr++];
bool isFragment = ((low & 1) == 1);
ushort sequenceNumber = (ushort)((low >> 1) | (((int)high) << 7));
ushort payloadBitLength = (ushort)(m_receiveBuffer[ptr++] | (m_receiveBuffer[ptr++] << 8));
int payloadByteLength = NetUtility.BytesToHoldBits(payloadBitLength);
if (bytesReceived - ptr < payloadByteLength)
{
LogWarning("Malformed packet; stated payload length " + payloadByteLength + ", remaining bytes " + (bytesReceived - ptr));
return;
}
try
{
NetException.Assert(tp <NetMessageType.Unused1 || tp> NetMessageType.Unused29);
if (tp >= NetMessageType.LibraryError)
{
if (sender != null)
{
sender.ReceivedLibraryMessage(tp, ptr, payloadByteLength);
}
else
{
ReceivedUnconnectedLibraryMessage(ipsender, tp, ptr, payloadByteLength);
}
}
else
{
if (sender == null && !m_configuration.IsMessageTypeEnabled(NetIncomingMessageType.UnconnectedData))
{
return; // dropping unconnected message since it's not enabled
}
NetIncomingMessage msg = CreateIncomingMessage(NetIncomingMessageType.Data, payloadByteLength);
msg.m_isFragment = isFragment;
msg.m_sequenceNumber = sequenceNumber;
msg.m_receivedMessageType = tp;
msg.m_senderConnection = sender;
msg.m_senderEndpoint = ipsender;
msg.m_bitLength = payloadBitLength;
Buffer.BlockCopy(m_receiveBuffer, ptr, msg.m_data, 0, payloadByteLength);
if (sender != null)
{
if (tp == NetMessageType.Unconnected)
{
// We're connected; but we can still send unconnected messages to this peer
msg.m_incomingMessageType = NetIncomingMessageType.UnconnectedData;
ReleaseMessage(msg);
}
else
{
// connected application (non-library) message
sender.ReceivedMessage(msg);
}
}
else
{
// at this point we know the message type is enabled
// unconnected application (non-library) message
msg.m_incomingMessageType = NetIncomingMessageType.UnconnectedData;
ReleaseMessage(msg);
}
}
}
catch (Exception ex)
{
LogError("Packet parsing error: " + ex.Message + " from " + ipsender);
}
ptr += payloadByteLength;
}
}
internal override void ReceiveMessage(NetIncomingMessage message)
{
int relate = NetUtility.RelativeSequenceNumber(message.m_sequenceNumber, m_windowStart);
// ack no matter what
m_connection.QueueAck(message.m_receivedMessageType, message.m_sequenceNumber);
if (relate == 0)
{
// Log("Received message #" + message.SequenceNumber + " right on time");
//
// excellent, right on time
//
//m_peer.LogVerbose("Received RIGHT-ON-TIME " + message);
AdvanceWindow();
m_peer.ReleaseMessage(message);
// release withheld messages
int nextSeqNr = (message.m_sequenceNumber + 1) % NetConstants.NumSequenceNumbers;
while (m_earlyReceived[nextSeqNr % m_windowSize])
{
message = m_withheldMessages[nextSeqNr % m_windowSize];
NetException.Assert(message != null);
// remove it from withheld messages
m_withheldMessages[nextSeqNr % m_windowSize] = null;
m_peer.LogVerbose("Releasing withheld message #" + message);
m_peer.ReleaseMessage(message);
AdvanceWindow();
nextSeqNr++;
}
return;
}
if (relate < 0)
{
// duplicate
m_connection.m_statistics.MessageDropped();
m_peer.LogVerbose("Received message #" + message.m_sequenceNumber + " DROPPING DUPLICATE");
return;
}
// relate > 0 = early message
if (relate > m_windowSize)
{
// too early message!
m_connection.m_statistics.MessageDropped();
m_peer.LogDebug("Received " + message + " TOO EARLY! Expected " + m_windowStart);
return;
}
m_earlyReceived.Set(message.m_sequenceNumber % m_windowSize, true);
m_peer.LogVerbose("Received " + message + " WITHHOLDING, waiting for " + m_windowStart);
m_withheldMessages[message.m_sequenceNumber % m_windowSize] = message;
}
/// <summary>
/// Получает большую книгу / по указанному индексу.
/// </summary>
public bool Get(int bitIndex)
{
NetException.Assert(bitIndex >= 0 && bitIndex < m_capacity);
return((m_data[bitIndex / 32] & (1 << (bitIndex % 32))) != 0);
}
/// <summary>
/// Устанавливает все биты / булевы к нулю / ложной.
/// </summary>
public void Clear()
{
Array.Clear(m_data, 0, m_data.Length);
m_numBitsSet = 0;
NetException.Assert(this.IsEmpty());
}
/// <summary>
/// Send a message to a list of connections
/// </summary>
/// <param name="msg">The message to send</param>
/// <param name="recipients">The list of recipients to send to</param>
/// <param name="method">How to deliver the message</param>
/// <param name="sequenceChannel">Sequence channel within the delivery method</param>
public void SendMessage(NetOutgoingMessage msg, IList <NetConnection> recipients, NetDeliveryMethod method, int sequenceChannel)
{
if (msg == null)
{
throw new ArgumentNullException("msg");
}
if (recipients == null)
{
if (msg.m_isSent == false)
{
Recycle(msg);
}
throw new ArgumentNullException("recipients");
}
if (recipients.Count < 1)
{
if (msg.m_isSent == false)
{
Recycle(msg);
}
throw new NetException("recipients must contain at least one item");
}
if (method == NetDeliveryMethod.Unreliable || method == NetDeliveryMethod.ReliableUnordered)
{
NetException.Assert(sequenceChannel == 0, "Delivery method " + method + " cannot use sequence channels other than 0!");
}
if (msg.m_isSent)
{
throw new NetException("This message has already been sent! Use NetPeer.SendMessage() to send to multiple recipients efficiently");
}
msg.m_isSent = true;
int mtu = GetMTU(recipients);
int len = msg.GetEncodedSize();
if (len <= mtu)
{
Interlocked.Add(ref msg.m_recyclingCount, recipients.Count);
foreach (NetConnection conn in recipients)
{
if (conn == null)
{
Interlocked.Decrement(ref msg.m_recyclingCount);
continue;
}
NetSendResult res = conn.EnqueueMessage(msg, method, sequenceChannel);
if (res == NetSendResult.Dropped)
{
Interlocked.Decrement(ref msg.m_recyclingCount);
}
}
}
else
{
// message must be fragmented!
SendFragmentedMessage(msg, recipients, method, sequenceChannel);
}
return;
}
// remoteWindowStart is remote expected sequence number; everything below this has arrived properly
// seqNr is the actual nr received
internal override void ReceiveAcknowledge(float now, int seqNr)
{
// late (dupe), on time or early ack?
int relate = NetUtility.RelativeSequenceNumber(seqNr, m_windowStart);
if (relate < 0)
{
return; // late/duplicate ack
}
if (relate == 0)
{
// ack arrived right on time
NetException.Assert(seqNr == m_windowStart);
m_receivedAcks[m_windowStart] = false;
DestoreMessage(m_windowStart % m_windowSize);
m_windowStart = (m_windowStart + 1) % NetConstants.NumSequenceNumbers;
// advance window if we already have early acks
while (m_receivedAcks.Get(m_windowStart))
{
m_receivedAcks[m_windowStart] = false;
DestoreMessage(m_windowStart % m_windowSize);
NetException.Assert(m_storedMessages[m_windowStart % m_windowSize].Message == null); // should already be destored
m_windowStart = (m_windowStart + 1) % NetConstants.NumSequenceNumbers;
}
return;
}
//
// early ack... (if it has been sent!)
//
// If it has been sent either the m_windowStart message was lost
// ... or the ack for that message was lost
//
int sendRelate = NetUtility.RelativeSequenceNumber(seqNr, m_sendStart);
if (sendRelate <= 0)
{
// yes, we've sent this message - it's an early (but valid) ack
if (m_receivedAcks[seqNr])
{
// we've already destored/been acked for this message
}
else
{
m_receivedAcks[seqNr] = true;
}
}
else if (sendRelate > 0)
{
// uh... we haven't sent this message yet? Weird, dupe or error...
NetException.Assert(false, "Got ack for message not yet sent?");
return;
}
// Ok, lets resend all missing acks
int rnr = seqNr;
do
{
rnr--;
if (rnr < 0)
{
rnr = NetConstants.NumSequenceNumbers - 1;
}
if (!m_receivedAcks[rnr])
{
int slot = rnr % m_windowSize;
NetException.Assert(m_storedMessages[slot].Message != null);
if (m_storedMessages[slot].NumSent == 1)
{
// just sent once; resend immediately since we found gap in ack sequence
NetOutgoingMessage rmsg = m_storedMessages[slot].Message;
if (now - m_storedMessages[slot].LastSent < (m_resendDelay * 0.35f))
{
// already resent recently
}
else
{
m_storedMessages[slot].LastSent = now;
m_storedMessages[slot].NumSent++;
m_connection.m_statistics.MessageResent(MessageResendReason.HoleInSequence);
m_connection.QueueSendMessage(rmsg, rnr);
}
}
}
} while (rnr != m_windowStart);
}
internal int Encode(byte[] intoBuffer, int ptr, int sequenceNumber)
{
// NOTE: I had to change the header format so it won't collide with multiplexed STUN on the same socket
// and I made it big-endian for consistency's sake. -AR
//
// <- MSB LSB ->
// 0 1 2 3
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
// V-+-+-+-+-+-+-+-V-+-+-+-+-+-+-+-V-+-+-+-+-+-+-+-V-+-+-+-+-+-+-+-V
// |1|F| Sequence Number |NetMessageType | Length bits...
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// ... |
// +-+-+-+-+-+-+-+-+
//
// IMPORTANT: The packet format is also encoded elsewhere, to send NetMessageType.Acknowledge (see NetConnection.cs)
//
intoBuffer[ptr++] = (byte)(((sequenceNumber >> 8) & 0x3F) | (m_fragmentGroup == 0 ? 0x80 : 0xC0));
intoBuffer[ptr++] = (byte)sequenceNumber;
intoBuffer[ptr++] = (byte)m_messageType;
if (m_fragmentGroup == 0)
{
intoBuffer[ptr++] = (byte)(m_bitLength >> 8);
intoBuffer[ptr++] = (byte)m_bitLength;
int byteLen = NetUtility.BytesToHoldBits(m_bitLength);
if (byteLen > 0)
{
Buffer.BlockCopy(m_data, 0, intoBuffer, ptr, byteLen);
ptr += byteLen;
}
}
else
{
int wasPtr = ptr;
intoBuffer[ptr++] = (byte)(m_bitLength >> 8);
intoBuffer[ptr++] = (byte)m_bitLength;
//
// write fragmentation header
//
ptr = NetFragmentationHelper.WriteHeader(intoBuffer, ptr, m_fragmentGroup, m_fragmentGroupTotalBits, m_fragmentChunkByteSize, m_fragmentChunkNumber);
int hdrLen = ptr - wasPtr - 2;
// update length
int realBitLength = m_bitLength + (hdrLen * 8);
intoBuffer[wasPtr] = (byte)(realBitLength >> 8);
intoBuffer[wasPtr + 1] = (byte)realBitLength;
int byteLen = NetUtility.BytesToHoldBits(m_bitLength);
if (byteLen > 0)
{
Buffer.BlockCopy(m_data, (int)(m_fragmentChunkNumber * m_fragmentChunkByteSize), intoBuffer, ptr, byteLen);
ptr += byteLen;
}
}
NetException.Assert(ptr > 0);
return(ptr);
}
private void Heartbeat()
{
VerifyNetworkThread();
double dnow = NetTime.Now;
float now = (float)dnow;
double delta = dnow - m_lastHeartbeat;
int maxCHBpS = 1250 - m_connections.Count;
if (maxCHBpS < 250)
{
maxCHBpS = 250;
}
if (delta > (1.0 / (double)maxCHBpS) || delta < 0.0) // max connection heartbeats/second max
{
m_frameCounter++;
m_lastHeartbeat = dnow;
// do handshake heartbeats
if ((m_frameCounter % 3) == 0)
{
foreach (var kvp in m_handshakes)
{
NetConnection conn = kvp.Value as NetConnection;
#if DEBUG
// sanity check
if (kvp.Key != kvp.Key)
{
LogWarning("Sanity fail! Connection in handshake list under wrong key!");
}
#endif
conn.UnconnectedHeartbeat(now);
if (conn.m_status == NetConnectionStatus.Connected || conn.m_status == NetConnectionStatus.Disconnected)
{
#if DEBUG
// sanity check
if (conn.m_status == NetConnectionStatus.Disconnected && m_handshakes.ContainsKey(conn.RemoteEndPoint))
{
LogWarning("Sanity fail! Handshakes list contained disconnected connection!");
m_handshakes.Remove(conn.RemoteEndPoint);
}
#endif
break; // collection has been modified
}
}
}
#if DEBUG
SendDelayedPackets();
#endif
// update m_executeFlushSendQueue
if (m_configuration.m_autoFlushSendQueue)
{
m_executeFlushSendQueue = true;
}
// do connection heartbeats
lock (m_connections)
{
foreach (NetConnection conn in m_connections)
{
conn.Heartbeat(now, m_frameCounter);
if (conn.m_status == NetConnectionStatus.Disconnected)
{
//
// remove connection
//
m_connections.Remove(conn);
m_connectionLookup.Remove(conn.RemoteEndPoint);
break; // can't continue iteration here
}
}
}
m_executeFlushSendQueue = false;
// send unsent unconnected messages
NetTuple <IPEndPoint, NetOutgoingMessage> unsent;
while (m_unsentUnconnectedMessages.TryDequeue(out unsent))
{
NetOutgoingMessage om = unsent.Item2;
bool connReset;
int len = om.Encode(m_sendBuffer, 0, 0);
SendPacket(len, unsent.Item1, 1, out connReset);
Interlocked.Decrement(ref om.m_recyclingCount);
if (om.m_recyclingCount <= 0)
{
Recycle(om);
}
}
}
// Would rather call this after reading, but a many things return (that probably shouldn't -AR) below here, so we call it now.
UpdateStun();
//
// read from socket
//
if (m_socket == null)
{
return;
}
if (!m_socket.Poll(1000, SelectMode.SelectRead)) // wait up to 1 ms for data to arrive
{
return;
}
//if (m_socket == null || m_socket.Available < 1)
// return;
// update now
dnow = NetTime.Now;
now = (float)dnow;
do
{
int bytesReceived = 0;
try
{
bytesReceived = m_socket.ReceiveFrom(m_receiveBuffer, 0, m_receiveBuffer.Length, SocketFlags.None, ref m_senderRemote);
}
catch (SocketException sx)
{
if (sx.SocketErrorCode == SocketError.ConnectionReset)
{
// connection reset by peer, aka connection forcibly closed aka "ICMP port unreachable"
// we should shut down the connection; but m_senderRemote seemingly cannot be trusted, so which connection should we shut down?!
// So, what to do?
LogWarning("ConnectionReset");
return;
}
LogWarning(sx.ToString());
return;
}
if (MaybeHandleStunPacket(m_receiveBuffer, 0, bytesReceived))
{
continue;
}
if (bytesReceived < NetConstants.HeaderByteSize)
{
return;
}
//LogVerbose("Received " + bytesReceived + " bytes");
if (m_upnp != null && now < m_upnp.m_discoveryResponseDeadline)
{
// is this an UPnP response?
try
{
string resp = System.Text.Encoding.ASCII.GetString(m_receiveBuffer, 0, bytesReceived);
if (resp.Contains("upnp:rootdevice") || resp.Contains("UPnP/1.0"))
{
resp = resp.Substring(resp.ToLower().IndexOf("location:") + 9);
resp = resp.Substring(0, resp.IndexOf("\r")).Trim();
m_upnp.ExtractServiceUrl(resp);
return;
}
}
catch { }
}
IPEndPoint ipsender = (IPEndPoint)m_senderRemote;
NetConnection sender = null;
m_connectionLookup.TryGetValue(ipsender, out sender);
//
// parse packet into messages
//
int numMessages = 0;
int ptr = 0;
while ((bytesReceived - ptr) >= NetConstants.HeaderByteSize)
{
// NOTE: I had to change the header format so it won't collide with multiplexed STUN on the same socket
// and I made it big-endian for consistency's sake. -AR
//
// <- MSB LSB ->
// 0 1 2 3
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
// V-+-+-+-+-+-+-+-V-+-+-+-+-+-+-+-V-+-+-+-+-+-+-+-V-+-+-+-+-+-+-+-V
// |1|F| Sequence Number |NetMessageType | Length bits...
// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
// ... |
// +-+-+-+-+-+-+-+-+
//
numMessages++;
byte seqHi = m_receiveBuffer[ptr++];
byte seqLo = m_receiveBuffer[ptr++];
bool isValid = ((seqHi & 0x80) != 0);
bool isFragment = ((seqHi & 0x40) != 0);
ushort sequenceNumber = (ushort)(((seqHi & 0x3F) << 8) | seqLo);
if (!isValid)
{
LogVerbose("Non-Lidgren packet");
return;
}
NetMessageType tp = (NetMessageType)m_receiveBuffer[ptr++];
ushort payloadBitLength = (ushort)((m_receiveBuffer[ptr++] << 8) | m_receiveBuffer[ptr++]);
int payloadByteLength = NetUtility.BytesToHoldBits(payloadBitLength);
if (bytesReceived - ptr < payloadByteLength)
{
LogWarning("Malformed packet; stated payload length " + payloadByteLength + ", remaining bytes " + (bytesReceived - ptr));
return;
}
try
{
NetException.Assert(tp <NetMessageType.Unused1 || tp> NetMessageType.Unused29);
if (tp >= NetMessageType.LibraryError)
{
if (sender != null)
{
sender.ReceivedLibraryMessage(tp, ptr, payloadByteLength);
}
else
{
ReceivedUnconnectedLibraryMessage(dnow, ipsender, tp, ptr, payloadByteLength);
}
}
else
{
if (sender == null && !m_configuration.IsMessageTypeEnabled(NetIncomingMessageType.UnconnectedData))
{
return; // dropping unconnected message since it's not enabled
}
NetIncomingMessage msg = CreateIncomingMessage(NetIncomingMessageType.Data, payloadByteLength);
msg.m_isFragment = isFragment;
msg.m_receiveTime = dnow;
msg.m_sequenceNumber = sequenceNumber;
msg.m_receivedMessageType = tp;
msg.m_senderConnection = sender;
msg.m_senderEndPoint = ipsender;
msg.m_bitLength = payloadBitLength;
Buffer.BlockCopy(m_receiveBuffer, ptr, msg.m_data, 0, payloadByteLength);
if (sender != null)
{
if (tp == NetMessageType.Unconnected)
{
// We're connected; but we can still send unconnected messages to this peer
msg.m_incomingMessageType = NetIncomingMessageType.UnconnectedData;
ReleaseMessage(msg);
}
else
{
// connected application (non-library) message
sender.ReceivedMessage(msg);
}
}
else
{
// at this point we know the message type is enabled
// unconnected application (non-library) message
msg.m_incomingMessageType = NetIncomingMessageType.UnconnectedData;
ReleaseMessage(msg);
}
}
}
catch (Exception ex)
{
LogError("Packet parsing error: " + ex.Message + " from " + ipsender);
}
ptr += payloadByteLength;
}
m_statistics.PacketReceived(bytesReceived, numMessages);
if (sender != null)
{
sender.m_statistics.PacketReceived(bytesReceived, numMessages);
}
} while (m_socket.Available > 0);
}
internal int Encode(byte[] intoBuffer, int ptr, long connectionId, int sequenceNumber)
{
// 8 bits - NetMessageType
// 64 bits - Connection ID
// 1 bit - Fragment?
// 15 bits - Sequence number
// 16 bits - Payload length in bits
intoBuffer[ptr++] = (byte)m_messageType;
intoBuffer[ptr++] = (byte)((connectionId >> 56) & 0xFF);
intoBuffer[ptr++] = (byte)((connectionId >> 48) & 0xFF);
intoBuffer[ptr++] = (byte)((connectionId >> 40) & 0xFF);
intoBuffer[ptr++] = (byte)((connectionId >> 32) & 0xFF);
intoBuffer[ptr++] = (byte)((connectionId >> 24) & 0xFF);
intoBuffer[ptr++] = (byte)((connectionId >> 16) & 0xFF);
intoBuffer[ptr++] = (byte)((connectionId >> 8) & 0xFF);
intoBuffer[ptr++] = (byte)((connectionId) & 0xFF);
byte low = (byte)((sequenceNumber << 1) | (m_fragmentGroup == 0 ? 0 : 1));
intoBuffer[ptr++] = low;
intoBuffer[ptr++] = (byte)(sequenceNumber >> 7);
if (m_fragmentGroup == 0)
{
intoBuffer[ptr++] = (byte)m_bitLength;
intoBuffer[ptr++] = (byte)(m_bitLength >> 8);
int byteLen = NetUtility.BytesToHoldBits(m_bitLength);
if (byteLen > 0)
{
Buffer.BlockCopy(m_data, 0, intoBuffer, ptr, byteLen);
ptr += byteLen;
}
}
else
{
int wasPtr = ptr;
intoBuffer[ptr++] = (byte)m_bitLength;
intoBuffer[ptr++] = (byte)(m_bitLength >> 8);
//
// write fragmentation header
//
ptr = NetFragmentationHelper.WriteHeader(intoBuffer, ptr, m_fragmentGroup, m_fragmentGroupTotalBits, m_fragmentChunkByteSize, m_fragmentChunkNumber);
int hdrLen = ptr - wasPtr - 2;
// update length
int realBitLength = m_bitLength + (hdrLen * 8);
intoBuffer[wasPtr] = (byte)realBitLength;
intoBuffer[wasPtr + 1] = (byte)(realBitLength >> 8);
int byteLen = NetUtility.BytesToHoldBits(m_bitLength);
if (byteLen > 0)
{
Buffer.BlockCopy(m_data, (int)(m_fragmentChunkNumber * m_fragmentChunkByteSize), intoBuffer, ptr, byteLen);
ptr += byteLen;
}
}
NetException.Assert(ptr > 0);
return(ptr);
}
// call this regularely
internal override void SendQueuedMessages(double now)
{
//
// resends
//
m_anyStoredResends = false;
for (int i = 0; i < m_storedMessages.Length; i++)
{
var storedMsg = m_storedMessages[i];
NetOutgoingMessage om = storedMsg.Message;
if (om == null)
{
continue;
}
m_anyStoredResends = true;
double t = storedMsg.LastSent;
if (t > 0 && (now - t) > m_resendDelay)
{
// deduce sequence number
/*
* int startSlot = m_windowStart % m_windowSize;
* int seqNr = m_windowStart;
* while (startSlot != i)
* {
* startSlot--;
* if (startSlot < 0)
* startSlot = m_windowSize - 1;
* seqNr--;
* }
*/
//m_connection.m_peer.LogVerbose("Resending due to delay #" + m_storedMessages[i].SequenceNumber + " " + om.ToString());
m_connection.m_statistics.MessageResent(MessageResendReason.Delay);
Interlocked.Increment(ref om.m_recyclingCount); // increment this since it's being decremented in QueueSendMessage
m_connection.QueueSendMessage(om, storedMsg.SequenceNumber);
m_storedMessages[i].LastSent = now;
m_storedMessages[i].NumSent++;
}
}
int num = GetAllowedSends();
if (num < 1)
{
return;
}
// queued sends
while (num > 0 && m_queuedSends.Count > 0)
{
NetOutgoingMessage om;
if (m_queuedSends.TryDequeue(out om))
{
ExecuteSend(now, om);
}
num--;
NetException.Assert(num == GetAllowedSends());
}
}
private void Heartbeat()
{
VerifyNetworkThread();
double dnow = NetTime.Now;
float now = (float)dnow;
double delta = dnow - m_lastHeartbeat;
int maxCHBpS = 1250 - m_connections.Count;
if (maxCHBpS < 250)
{
maxCHBpS = 250;
}
if (delta > (1.0 / (double)maxCHBpS) || delta < 0.0) // max connection heartbeats/second max
{
m_frameCounter++;
m_lastHeartbeat = dnow;
// do handshake heartbeats
if ((m_frameCounter % 3) == 0)
{
foreach (var kvp in m_handshakes)
{
NetConnection conn = kvp.Value as NetConnection;
#if DEBUG
// sanity check
if (kvp.Key != kvp.Key)
{
LogWarning("Sanity fail! Connection in handshake list under wrong key!");
}
#endif
conn.UnconnectedHeartbeat(now);
if (conn.m_status == NetConnectionStatus.Connected || conn.m_status == NetConnectionStatus.Disconnected)
{
#if DEBUG
// sanity check
if (conn.m_status == NetConnectionStatus.Disconnected && m_handshakes.ContainsKey(conn.RemoteEndPoint))
{
LogWarning("Sanity fail! Handshakes list contained disconnected connection!");
m_handshakes.Remove(conn.RemoteEndPoint);
}
#endif
break; // collection has been modified
}
}
}
#if DEBUG
SendDelayedPackets();
#endif
// update m_executeFlushSendQueue
if (m_configuration.m_autoFlushSendQueue)
{
m_executeFlushSendQueue = true;
}
// do connection heartbeats
lock (m_connections)
{
foreach (NetConnection conn in m_connections)
{
conn.Heartbeat(now, m_frameCounter);
if (conn.m_status == NetConnectionStatus.Disconnected)
{
//
// remove connection
//
m_connections.Remove(conn);
m_connectionLookup.Remove(conn.RemoteEndPoint);
break; // can't continue iteration here
}
}
}
m_executeFlushSendQueue = false;
// send unsent unconnected messages
NetTuple <IPEndPoint, NetOutgoingMessage> unsent;
while (m_unsentUnconnectedMessages.TryDequeue(out unsent))
{
NetOutgoingMessage om = unsent.Item2;
bool connReset;
int len = om.Encode(m_sendBuffer, 0, 0);
SendPacket(len, unsent.Item1, 1, out connReset);
Interlocked.Decrement(ref om.m_recyclingCount);
if (om.m_recyclingCount <= 0)
{
Recycle(om);
}
}
}
//
// read from socket
//
if (m_socket == null)
{
return;
}
if (!m_socket.Poll(1000, SelectMode.SelectRead)) // wait up to 1 ms for data to arrive
{
return;
}
do
{
int bytesReceived = 0;
try
{
bytesReceived = m_socket.ReceiveFrom(m_receiveBuffer, 0, m_receiveBuffer.Length, SocketFlags.None, ref m_senderRemote);
}
catch (SocketException sx)
{
if (sx.SocketErrorCode == SocketError.ConnectionReset)
{
// connection reset by peer, aka connection forcibly closed aka "ICMP port unreachable"
// we should shut down the connection; but m_senderRemote seemingly cannot be trusted, so which connection should we shut down?!
// So, what to do?
LogWarning("ConnectionReset");
return;
}
LogWarning(sx.ToString());
return;
}
if (bytesReceived < NetConstants.HeaderByteSize)
{
return;
}
IPEndPoint ipsender = (IPEndPoint)m_senderRemote;
if (ipsender.Port == 1900)
{
// UPnP response
try
{
string resp = System.Text.Encoding.ASCII.GetString(m_receiveBuffer, 0, bytesReceived);
if (resp.Contains("upnp:rootdevice"))
{
resp = resp.Substring(resp.ToLower().IndexOf("location:") + 9);
resp = resp.Substring(0, resp.IndexOf("\r")).Trim();
m_upnp.ExtractServiceUrl(resp);
return;
}
}
catch { }
}
NetConnection sender = null;
m_connectionLookup.TryGetValue(ipsender, out sender);
double receiveTime = NetTime.Now;
//
// parse packet into messages
//
int numMessages = 0;
int ptr = 0;
while ((bytesReceived - ptr) >= NetConstants.HeaderByteSize)
{
// decode header
// 8 bits - NetMessageType
// 1 bit - Fragment?
// 15 bits - Sequence number
// 16 bits - Payload length in bits
numMessages++;
NetMessageType tp = (NetMessageType)m_receiveBuffer[ptr++];
byte low = m_receiveBuffer[ptr++];
byte high = m_receiveBuffer[ptr++];
bool isFragment = ((low & 1) == 1);
ushort sequenceNumber = (ushort)((low >> 1) | (((int)high) << 7));
ushort payloadBitLength = (ushort)(m_receiveBuffer[ptr++] | (m_receiveBuffer[ptr++] << 8));
int payloadByteLength = NetUtility.BytesToHoldBits(payloadBitLength);
if (bytesReceived - ptr < payloadByteLength)
{
LogWarning("Malformed packet; stated payload length " + payloadByteLength + ", remaining bytes " + (bytesReceived - ptr));
return;
}
try
{
NetException.Assert(tp <NetMessageType.Unused1 || tp> NetMessageType.Unused29);
if (tp >= NetMessageType.LibraryError)
{
if (sender != null)
{
sender.ReceivedLibraryMessage(tp, ptr, payloadByteLength);
}
else
{
ReceivedUnconnectedLibraryMessage(receiveTime, ipsender, tp, ptr, payloadByteLength);
}
}
else
{
if (sender == null && !m_configuration.IsMessageTypeEnabled(NetIncomingMessageType.UnconnectedData))
{
return; // dropping unconnected message since it's not enabled
}
NetIncomingMessage msg = CreateIncomingMessage(NetIncomingMessageType.Data, payloadByteLength);
msg.m_isFragment = isFragment;
msg.m_receiveTime = receiveTime;
msg.m_sequenceNumber = sequenceNumber;
msg.m_receivedMessageType = tp;
msg.m_senderConnection = sender;
msg.m_senderEndPoint = ipsender;
msg.m_bitLength = payloadBitLength;
Buffer.BlockCopy(m_receiveBuffer, ptr, msg.m_data, 0, payloadByteLength);
if (sender != null)
{
if (tp == NetMessageType.Unconnected)
{
// We're connected; but we can still send unconnected messages to this peer
msg.m_incomingMessageType = NetIncomingMessageType.UnconnectedData;
ReleaseMessage(msg);
}
else
{
// connected application (non-library) message
sender.ReceivedMessage(msg);
}
}
else
{
// at this point we know the message type is enabled
// unconnected application (non-library) message
msg.m_incomingMessageType = NetIncomingMessageType.UnconnectedData;
ReleaseMessage(msg);
}
}
}
catch (Exception ex)
{
LogError("Packet parsing error: " + ex.Message + " from " + ipsender);
}
ptr += payloadByteLength;
}
m_statistics.PacketReceived(bytesReceived, numMessages);
if (sender != null)
{
sender.m_statistics.PacketReceived(bytesReceived, numMessages);
}
} while (m_socket.Available > 0);
}
/// <summary>
/// Reads the specified number of bits into an Int64 without advancing the read pointer
/// </summary>
public Int64 PeekInt64(int numberOfBits)
{
NetException.Assert(((numberOfBits > 0) && (numberOfBits < 65)), "ReadInt64(bits) can only read between 1 and 64 bits");
return((long)PeekUInt64(numberOfBits));
}
internal void Heartbeat(float now, uint frameCounter)
{
m_peer.VerifyNetworkThread();
NetException.Assert(m_status != NetConnectionStatus.InitiatedConnect && m_status != NetConnectionStatus.RespondedConnect);
if ((frameCounter % 5) == 0)
{
if (now > m_timeoutDeadline)
{
//
// connection timed out
//
m_peer.LogVerbose("Connection timed out at " + now + " deadline was " + m_timeoutDeadline);
ExecuteDisconnect("Connection timed out", true);
}
// send ping?
if (m_status == NetConnectionStatus.Connected)
{
if (now > m_sentPingTime + m_peer.m_configuration.m_pingInterval)
{
SendPing();
}
}
if (m_disconnectRequested)
{
ExecuteDisconnect(m_disconnectMessage, true);
return;
}
}
bool connectionReset; // TODO: handle connection reset
//
// Note: at this point m_sendBufferWritePtr and m_sendBufferNumMessages may be non-null; resends may already be queued up
//
byte[] sendBuffer = m_peer.m_sendBuffer;
int mtu = m_peerConfiguration.m_maximumTransmissionUnit;
if ((frameCounter % 3) == 0) // coalesce a few frames
{
//
// send ack messages
//
while (m_queuedAcks.Count > 0)
{
int acks = (mtu - (m_sendBufferWritePtr + 5)) / 3; // 3 bytes per actual ack
if (acks > m_queuedAcks.Count)
{
acks = m_queuedAcks.Count;
}
NetException.Assert(acks > 0);
m_sendBufferNumMessages++;
// write acks header
sendBuffer[m_sendBufferWritePtr++] = (byte)NetMessageType.Acknowledge;
sendBuffer[m_sendBufferWritePtr++] = 0; // no sequence number
sendBuffer[m_sendBufferWritePtr++] = 0; // no sequence number
int len = (acks * 3) * 8; // bits
sendBuffer[m_sendBufferWritePtr++] = (byte)len;
sendBuffer[m_sendBufferWritePtr++] = (byte)(len >> 8);
// write acks
for (int i = 0; i < acks; i++)
{
NetTuple <NetMessageType, int> tuple;
m_queuedAcks.TryDequeue(out tuple);
//m_peer.LogVerbose("Sending ack for " + tuple.Item1 + "#" + tuple.Item2);
sendBuffer[m_sendBufferWritePtr++] = (byte)tuple.Item1;
sendBuffer[m_sendBufferWritePtr++] = (byte)tuple.Item2;
sendBuffer[m_sendBufferWritePtr++] = (byte)(tuple.Item2 >> 8);
}
if (m_queuedAcks.Count > 0)
{
// send packet and go for another round of acks
NetException.Assert(m_sendBufferWritePtr > 0 && m_sendBufferNumMessages > 0);
m_peer.SendPacket(m_sendBufferWritePtr, m_remoteEndpoint, m_sendBufferNumMessages, out connectionReset);
m_statistics.PacketSent(m_sendBufferWritePtr, 1);
m_sendBufferWritePtr = 0;
m_sendBufferNumMessages = 0;
}
}
}
//
// send queued messages
//
for (int i = m_sendChannels.Length - 1; i >= 0; i--) // Reverse order so reliable messages are sent first
{
var channel = m_sendChannels[i];
NetException.Assert(m_sendBufferWritePtr < 1 || m_sendBufferNumMessages > 0);
if (channel != null)
{
channel.SendQueuedMessages(now);
}
NetException.Assert(m_sendBufferWritePtr < 1 || m_sendBufferNumMessages > 0);
}
//
// Put on wire data has been written to send buffer but not yet sent
//
if (m_sendBufferWritePtr > 0)
{
m_peer.VerifyNetworkThread();
NetException.Assert(m_sendBufferWritePtr > 0 && m_sendBufferNumMessages > 0);
m_peer.SendPacket(m_sendBufferWritePtr, m_remoteEndpoint, m_sendBufferNumMessages, out connectionReset);
m_statistics.PacketSent(m_sendBufferWritePtr, m_sendBufferNumMessages);
m_sendBufferWritePtr = 0;
m_sendBufferNumMessages = 0;
}
}