1 files changed, 196 insertions, 23 deletions

diff --git a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
index 419de66..df4bbb3 100644
--- a/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
+++ b/OpenSim/Region/ClientStack/Linden/UDP/LLUDPServer.cs
@@ -113,7 +113,9 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         /// <summary>Handlers for incoming packets</summary>
         //PacketEventDictionary packetEvents = new PacketEventDictionary();
         /// <summary>Incoming packets that are awaiting handling</summary>
-        private OpenMetaverse.BlockingQueue<IncomingPacket> packetInbox = new OpenMetaverse.BlockingQueue<IncomingPacket>();
+        //private OpenMetaverse.BlockingQueue<IncomingPacket> packetInbox = new OpenMetaverse.BlockingQueue<IncomingPacket>();
+
+        private DoubleQueue<IncomingPacket> packetInbox = new DoubleQueue<IncomingPacket>();
 
         /// <summary></summary>
         //private UDPClientCollection m_clients = new UDPClientCollection();
@@ -168,6 +170,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         /// <summary>Flag to signal when clients should send pings</summary>
         protected bool m_sendPing;
 
+        private ExpiringCache<IPEndPoint, Queue<UDPPacketBuffer>> m_pendingCache = new ExpiringCache<IPEndPoint, Queue<UDPPacketBuffer>>();
         private Pool<IncomingPacket> m_incomingPacketPool;
 
         private int m_defaultRTO = 0;
@@ -891,21 +894,46 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
             #region Packet to Client Mapping
 
-            // UseCircuitCode handling
-            if (packet.Type == PacketType.UseCircuitCode)
+            // If there is already a client for this endpoint, don't process UseCircuitCode
+            IClientAPI client = null;
+            if (!m_scene.TryGetClient(endPoint, out client) || !(client is LLClientView))
             {
-                // We need to copy the endpoint so that it doesn't get changed when another thread reuses the
-                // buffer.
-                object[] array = new object[] { new IPEndPoint(endPoint.Address, endPoint.Port), packet };
+                // UseCircuitCode handling
+                if (packet.Type == PacketType.UseCircuitCode)
+                {
+                    // And if there is a UseCircuitCode pending, also drop it
+                    lock (m_pendingCache)
+                    {
+                        if (m_pendingCache.Contains(endPoint))
+                            return;
 
-                Util.FireAndForget(HandleUseCircuitCode, array);
+                        m_pendingCache.AddOrUpdate(endPoint, new Queue<UDPPacketBuffer>(), 60);
+                    }
 
-                return;
+                    // We need to copy the endpoint so that it doesn't get changed when another thread reuses the
+                    // buffer.
+                    object[] array = new object[] { new IPEndPoint(endPoint.Address, endPoint.Port), packet };
+
+                    Util.FireAndForget(HandleUseCircuitCode, array);
+
+                    return;
+                }
+            }
+
+            // If this is a pending connection, enqueue, don't process yet
+            lock (m_pendingCache)
+            {
+                Queue<UDPPacketBuffer> queue;
+                if (m_pendingCache.TryGetValue(endPoint, out queue))
+                {
+                    //m_log.DebugFormat("[LLUDPSERVER]: Enqueued a {0} packet into the pending queue", packet.Type);
+                    queue.Enqueue(buffer);
+                    return;
+                }
             }
 
             // Determine which agent this packet came from
-            IClientAPI client;
-            if (!m_scene.TryGetClient(endPoint, out client) || !(client is LLClientView))
+            if (client == null || !(client is LLClientView))
             {
                 //m_log.Debug("[LLUDPSERVER]: Received a " + packet.Type + " packet from an unrecognized source: " + address + " in " + m_scene.RegionInfo.RegionName);
                 return;
@@ -914,7 +942,10 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             udpClient = ((LLClientView)client).UDPClient;
 
             if (!udpClient.IsConnected)
+            {
+//                m_log.Debug("[LLUDPSERVER]: Received a " + packet.Type + " packet for a unConnected client in " + m_scene.RegionInfo.RegionName);
                 return;
+            }
 
             #endregion Packet to Client Mapping
 
@@ -1044,7 +1075,11 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 incomingPacket = new IncomingPacket((LLClientView)client, packet);
             }
 
-            packetInbox.Enqueue(incomingPacket);
+            if (incomingPacket.Packet.Type == PacketType.AgentUpdate ||
+                incomingPacket.Packet.Type == PacketType.ChatFromViewer)
+                packetInbox.EnqueueHigh(incomingPacket);
+            else
+                packetInbox.EnqueueLow(incomingPacket);
         }
 
         #region BinaryStats
@@ -1164,6 +1199,32 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                     // We only want to send initial data to new clients, not ones which are being converted from child to root.
                     if (client != null)
                         client.SceneAgent.SendInitialDataToMe();
+
+                    // Now we know we can handle more data
+                    Thread.Sleep(200);
+
+                    // Obtain the queue and remove it from the cache
+                    Queue<UDPPacketBuffer> queue = null;
+
+                    lock (m_pendingCache)
+                    {
+                        if (!m_pendingCache.TryGetValue(endPoint, out queue))
+                        {
+                            m_log.DebugFormat("[LLUDPSERVER]: Client created but no pending queue present");
+                            return;
+                        }
+                        m_pendingCache.Remove(endPoint);
+                    }
+
+                    m_log.DebugFormat("[LLUDPSERVER]: Client created, processing pending queue, {0} entries", queue.Count);
+
+                    // Reinject queued packets
+                    while(queue.Count > 0)
+                    {
+                        UDPPacketBuffer buf = queue.Dequeue();
+                        PacketReceived(buf);
+                    }
+                    queue = null;
                 }
                 else
                 {
@@ -1171,6 +1232,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                     m_log.WarnFormat(
                         "[LLUDPSERVER]: Ignoring connection request for {0} to {1} with unknown circuit code {2} from IP {3}",
                         uccp.CircuitCode.ID, m_scene.RegionInfo.RegionName, uccp.CircuitCode.Code, endPoint);
+                    lock (m_pendingCache)
+                        m_pendingCache.Remove(endPoint);
                 }
     
                 //            m_log.DebugFormat(
@@ -1289,7 +1352,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 if (!client.SceneAgent.IsChildAgent)
                      client.Kick("Simulator logged you out due to connection timeout");
     
-                client.CloseWithoutChecks();
+                client.CloseWithoutChecks(true);
             }
         }
 
@@ -1301,6 +1364,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
             while (IsRunningInbound)
             {
+                m_scene.ThreadAlive(1);
                 try
                 {
                     IncomingPacket incomingPacket = null;
@@ -1348,6 +1412,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
 
             while (base.IsRunningOutbound)
             {
+                m_scene.ThreadAlive(2);
                 try
                 {
                     m_packetSent = false;
@@ -1569,8 +1634,8 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             Packet packet = incomingPacket.Packet;
             LLClientView client = incomingPacket.Client;
 
-            if (client.IsActive)
-            {
+//            if (client.IsActive)
+//            {
                 m_currentIncomingClient = client;
 
                 try
@@ -1597,13 +1662,13 @@ namespace OpenSim.Region.ClientStack.LindenUDP
                 {
                     m_currentIncomingClient = null;
                 }
-            }
-            else
-            {
-                m_log.DebugFormat(
-                    "[LLUDPSERVER]: Dropped incoming {0} for dead client {1} in {2}",
-                    packet.Type, client.Name, m_scene.RegionInfo.RegionName);
-            }
+//            }
+//            else
+//            {
+//                m_log.DebugFormat(
+//                    "[LLUDPSERVER]: Dropped incoming {0} for dead client {1} in {2}",
+//                    packet.Type, client.Name, m_scene.RegionInfo.RegionName);
+//            }
         }
 
         protected void LogoutHandler(IClientAPI client)
@@ -1613,8 +1678,116 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             if (!client.IsLoggingOut)
             {
                 client.IsLoggingOut = true;
-                client.Close();
+                client.Close(false, false);
+            }
+        }
+    }
+
+    internal class DoubleQueue<T> where T:class
+    {
+        private Queue<T> m_lowQueue = new Queue<T>();
+        private Queue<T> m_highQueue = new Queue<T>();
+
+        private object m_syncRoot = new object();
+        private Semaphore m_s = new Semaphore(0, 1);
+
+        public DoubleQueue()
+        {
+        }
+
+        public virtual int Count
+        {
+            get { return m_highQueue.Count + m_lowQueue.Count; }
+        }
+
+        public virtual void Enqueue(T data)
+        {
+            Enqueue(m_lowQueue, data);
+        }
+
+        public virtual void EnqueueLow(T data)
+        {
+            Enqueue(m_lowQueue, data);
+        }
+
+        public virtual void EnqueueHigh(T data)
+        {
+            Enqueue(m_highQueue, data);
+        }
+
+        private void Enqueue(Queue<T> q, T data)
+        {
+            lock (m_syncRoot)
+            {
+                m_lowQueue.Enqueue(data);
+                m_s.WaitOne(0);
+                m_s.Release();
+            }
+        }
+
+        public virtual T Dequeue()
+        {
+            return Dequeue(Timeout.Infinite);
+        }
+
+        public virtual T Dequeue(int tmo)
+        {
+            return Dequeue(TimeSpan.FromMilliseconds(tmo));
+        }
+
+        public virtual T Dequeue(TimeSpan wait)
+        {
+            T res = null;
+
+            if (!Dequeue(wait, ref res))
+                return null;
+
+            return res;
+        }
+
+        public bool Dequeue(int timeout, ref T res)
+        {
+            return Dequeue(TimeSpan.FromMilliseconds(timeout), ref res);
+        }
+
+        public bool Dequeue(TimeSpan wait, ref T res)
+        {
+            if (!m_s.WaitOne(wait))
+                return false;
+            
+            lock (m_syncRoot)
+            {
+                if (m_highQueue.Count > 0)
+                    res = m_highQueue.Dequeue();
+                else
+                    res = m_lowQueue.Dequeue();
+
+                if (m_highQueue.Count == 0 && m_lowQueue.Count == 0)
+                    return true;
+
+                try
+                {
+                    m_s.Release();
+                }
+                catch
+                {
+                }
+
+                return true;
+            }
+        }
+
+        public virtual void Clear()
+        {
+
+            lock (m_syncRoot)
+            {
+                // Make sure sem count is 0
+                m_s.WaitOne(0);
+
+                m_lowQueue.Clear();
+                m_highQueue.Clear();
             }
         }
     }
-}
\ No newline at end of file
+}