/// <summary>
/// Default constructor
/// </summary>
/// <param name="client">Reference to the client this packet is destined for</param>
/// <param name="buffer">
/// Serialized packet data. If the flags or sequence number
/// need to be updated, they will be injected directly into this binary buffer
/// </param>
/// <param name="category">Throttling category for this packet</param>
/// <param name="resendMethod">The delegate to be called if this packet is determined to be unacknowledged</param>
/// <param name="finishedMethod">The delegate to be called when this packet is sent</param>
/// <param name="packet"></param>
public OutgoingPacket(LLUDPClient client, UDPPacketBuffer buffer,
ThrottleOutPacketType category, UnackedPacketMethod resendMethod,
UnackedPacketMethod finishedMethod, Packet packet)
{
Client = client;
Buffer = buffer;
Category = category;
UnackedMethod = resendMethod;
FinishedMethod = finishedMethod;
Packet = packet;
}
/// <summary>
/// Default constructor
/// </summary>
/// <param name="client">Reference to the client this packet is destined for</param>
/// <param name="buffer">
/// Serialized packet data. If the flags or sequence number
/// need to be updated, they will be injected directly into this binary buffer
/// </param>
/// <param name="category">Throttling category for this packet</param>
/// <param name="resendMethod">The delegate to be called if this packet is determined to be unacknowledged</param>
/// <param name="finishedMethod">The delegate to be called when this packet is sent</param>
/// <param name="packet"></param>
public OutgoingPacket(LLUDPClient client, UDPPacketBuffer buffer,
ThrottleOutPacketType category, UnackedPacketMethod resendMethod,
UnackedPacketMethod finishedMethod, Packet packet)
{
Client = client;
Buffer = buffer;
Category = category;
UnackedMethod = resendMethod;
FinishedMethod = finishedMethod;
Packet = packet;
}
/// <summary>
/// Default constructor
/// </summary>
/// <param name="client">Reference to the client this packet came from</param>
/// <param name="packet">Packet data</param>
public IncomingPacket(LLUDPClient client, Packet packet)
{
Client = client;
Packet = packet;
}
public void SendPing(LLUDPClient udpClient)
{
StartPingCheckPacket pc = (StartPingCheckPacket) PacketPool.Instance.GetPacket(PacketType.StartPingCheck);
pc.Header.Reliable = false;
pc.PingID.PingID = udpClient.CurrentPingSequence++;
// We *could* get OldestUnacked, but it would hurt performance and not provide any benefit
pc.PingID.OldestUnacked = 0;
SendPacket(udpClient, pc, ThrottleOutPacketType.OutBand, false, null, null);
}
public void SendPacketData(LLUDPClient udpClient, byte[] data, Packet packet, ThrottleOutPacketType category,
UnackedPacketMethod resendMethod, UnackedPacketMethod finishedMethod)
{
int dataLength = data.Length;
bool doZerocode = (data[0] & Helpers.MSG_ZEROCODED) != 0;
bool doCopy = true;
// Frequency analysis of outgoing packet sizes shows a large clump of packets at each end of the spectrum.
// The vast majority of packets are less than 200 bytes, although due to asset transfers and packet splitting
// there are a decent number of packets in the 1000-1140 byte range. We allocate one of two sizes of data here
// to accommodate for both common scenarios and provide ample room for ACK appending in both
int bufferSize = dataLength*2;
UDPPacketBuffer buffer = new UDPPacketBuffer(udpClient.RemoteEndPoint, bufferSize);
// Zerocode if needed
if (doZerocode)
{
try
{
dataLength = Helpers.ZeroEncode(data, dataLength, buffer.Data);
doCopy = false;
}
catch (IndexOutOfRangeException)
{
// The packet grew larger than the bufferSize while zerocoding.
// Remove the MSG_ZEROCODED flag and send the unencoded data
// instead
MainConsole.Instance.Debug("[LLUDP Server]: Packet exceeded buffer size during zerocoding for " +
packet.Type +
". DataLength=" + dataLength +
" and BufferLength=" + buffer.Data.Length +
". Removing MSG_ZEROCODED flag");
data[0] = (byte) (data[0] & ~Helpers.MSG_ZEROCODED);
}
}
// If the packet data wasn't already copied during zerocoding, copy it now
if (doCopy)
{
if (dataLength <= buffer.Data.Length)
{
Buffer.BlockCopy(data, 0, buffer.Data, 0, dataLength);
}
else
{
bufferSize = dataLength;
buffer = new UDPPacketBuffer(udpClient.RemoteEndPoint, bufferSize);
// MainConsole.Instance.Error("[LLUDP Server]: Packet exceeded buffer size! This could be an indication of packet assembly not obeying the MTU. Type=" +
// type + ", DataLength=" + dataLength + ", BufferLength=" + buffer.Data.Length + ". Dropping packet");
Buffer.BlockCopy(data, 0, buffer.Data, 0, dataLength);
}
}
buffer.DataLength = dataLength;
#region Queue or Send
OutgoingPacket outgoingPacket = new OutgoingPacket(udpClient, buffer, category, resendMethod, finishedMethod, packet);
if (!outgoingPacket.Client.EnqueueOutgoing(outgoingPacket))
SendPacketFinal(outgoingPacket);
#endregion Queue or Send
}
public void SendPacket(LLUDPClient udpClient, Packet packet, ThrottleOutPacketType category, bool allowSplitting,
UnackedPacketMethod resendMethod, UnackedPacketMethod finishedMethod)
{
// CoarseLocationUpdate packets cannot be split in an automated way
if (packet.Type == PacketType.CoarseLocationUpdate && allowSplitting)
allowSplitting = false;
if (allowSplitting && packet.HasVariableBlocks)
{
byte[][] datas = packet.ToBytesMultiple();
int packetCount = datas.Length;
if (packetCount < 1)
MainConsole.Instance.Error("[LLUDP Server]: Failed to split " + packet.Type +
" with estimated length " + packet.Length);
for (int i = 0; i < packetCount; i++)
{
byte[] data = datas[i];
SendPacketData(udpClient, data, packet, category, resendMethod, finishedMethod);
}
}
else
{
byte[] data = packet.ToBytes();
SendPacketData(udpClient, data, packet, category, resendMethod, finishedMethod);
}
}
public void SendAcks(LLUDPClient udpClient)
{
uint ack;
if (udpClient.PendingAcks.TryDequeue(out ack))
{
List<PacketAckPacket.PacketsBlock> blocks = new List<PacketAckPacket.PacketsBlock>();
PacketAckPacket.PacketsBlock block = new PacketAckPacket.PacketsBlock {ID = ack};
blocks.Add(block);
while (udpClient.PendingAcks.TryDequeue(out ack))
{
block = new PacketAckPacket.PacketsBlock {ID = ack};
blocks.Add(block);
}
PacketAckPacket packet = (PacketAckPacket) PacketPool.Instance.GetPacket(PacketType.PacketAck);
packet.Header.Reliable = false;
packet.Packets = blocks.ToArray();
SendPacket(udpClient, packet, ThrottleOutPacketType.OutBand, true, null, null);
}
}
public void ResendUnacked(LLUDPClient udpClient)
{
if (!udpClient.IsConnected)
return;
// Disconnect an agent if no packets are received for some time
if ((Environment.TickCount & int.MaxValue) - udpClient.TickLastPacketReceived > 1000*ClientTimeOut &&
!udpClient.IsPaused)
{
MainConsole.Instance.Warn("[LLUDP Server]: Ack timeout, disconnecting " + udpClient.AgentID);
ILoginMonitor monitor = m_scene.RequestModuleInterface<IMonitorModule>().GetMonitor<ILoginMonitor>(null);
if (monitor != null)
monitor.AddAbnormalClientThreadTermination();
RemoveClient(udpClient);
return;
}
// Get a list of all of the packets that have been sitting unacked longer than udpClient.RTO
List<OutgoingPacket> expiredPackets = udpClient.NeedAcks.GetExpiredPackets(udpClient.RTO);
if (expiredPackets != null)
{
//MainConsole.Instance.Debug("[LLUDP Server]: Resending " + expiredPackets.Count + " packets to " + udpClient.AgentID + ", RTO=" + udpClient.RTO);
// Exponential back off of the retransmission timeout
udpClient.BackoffRTO();
foreach (OutgoingPacket t in expiredPackets.Where(t => t.UnackedMethod != null))
{
t.UnackedMethod(t);
}
// Resend packets
foreach (OutgoingPacket outgoingPacket in expiredPackets.Where(t => t.UnackedMethod == null))
{
//MainConsole.Instance.DebugFormat("[LLUDP Server]: Resending packet #{0} (attempt {1}), {2}ms have passed",
// outgoingPacket.SequenceNumber, outgoingPacket.ResendCount, Environment.TickCount - outgoingPacket.TickCount);
// Set the resent flag
outgoingPacket.Buffer.Data[0] = (byte) (outgoingPacket.Buffer.Data[0] | Helpers.MSG_RESENT);
// resend in its original category
outgoingPacket.Category = ThrottleOutPacketType.Resend;
// Bump up the resend count on this packet
Interlocked.Increment(ref outgoingPacket.ResendCount);
//Interlocked.Increment(ref Stats.ResentPackets);
// Requeue or resend the packet
if (!outgoingPacket.Client.EnqueueOutgoing(outgoingPacket))
SendPacketFinal(outgoingPacket);
}
}
}
public void Flush(LLUDPClient udpClient)
{
// FIXME: Implement?
}
public void CompletePing(LLUDPClient udpClient, byte pingID)
{
CompletePingCheckPacket completePing =
(CompletePingCheckPacket) PacketPool.Instance.GetPacket(PacketType.CompletePingCheck);
completePing.PingID.PingID = pingID;
SendPacket(udpClient, completePing, ThrottleOutPacketType.OutBand, false, null, null);
}
public virtual bool AddClient(uint circuitCode, UUID agentID, UUID sessionID, IPEndPoint remoteEndPoint,
AgentCircuitData sessionInfo)
{
MainConsole.Instance.Debug("[LLUDP Server] AddClient-" + circuitCode + "-" + agentID + "-" + sessionID + "-" +
remoteEndPoint + "-" + sessionInfo);
IScenePresence SP;
if (!m_scene.TryGetScenePresence(agentID, out SP))
{
// Create the LLUDPClient
LLUDPClient udpClient = new LLUDPClient(this, m_throttleRates, m_throttle, circuitCode, agentID,
remoteEndPoint, m_defaultRTO, m_maxRTO);
// Create the LLClientView
LLClientView client = new LLClientView(remoteEndPoint, m_scene, this, udpClient, sessionInfo, agentID,
sessionID, circuitCode);
client.OnLogout += LogoutHandler;
// Start the IClientAPI
m_scene.AddNewClient(client, null);
m_currentClients.Add(client);
}
else
{
MainConsole.Instance.DebugFormat(
"[LLUDP Server]: Ignoring a repeated UseCircuitCode ({0}) from {1} at {2} ",
circuitCode, agentID, remoteEndPoint);
}
return true;
}
void RemoveClient(LLUDPClient udpClient)
{
// Remove this client from the scene
IClientAPI client;
if (m_scene.ClientManager.TryGetValue(udpClient.AgentID, out client))
{
client.IsLoggingOut = true;
IEntityTransferModule transferModule = m_scene.RequestModuleInterface<IEntityTransferModule>();
if (transferModule != null)
transferModule.IncomingCloseAgent(m_scene, udpClient.AgentID);
RemoveClient(client);
}
}
/// <summary>
/// Default constructor
/// </summary>
/// <param name="client">Reference to the client this packet came from</param>
/// <param name="packet">Packet data</param>
public IncomingPacket(LLUDPClient client, Packet packet)
{
Client = client;
Packet = packet;
}