Check if remote simulator is up before attempting teleport. Teleport to a remote region should now fail gracefully if remote simulator is down.

OpenSim/Framework/IClientAPI.cs

@@ -555,7 +555,7 @@ namespace OpenSim.Framework
         void SendRegionTeleport(ulong regionHandle, byte simAccess, IPEndPoint regionExternalEndPoint, uint locationID,
                                 uint flags, string capsURL);
 
-        void SendTeleportFailed();
+        void SendTeleportFailed(string reason);
         void SendTeleportLocationStart();
         void SendMoneyBalance(LLUUID transaction, bool success, byte[] description, int balance);
 

OpenSim/Region/ClientStack/ClientView.cs

@@ -890,11 +890,11 @@ namespace OpenSim.Region.ClientStack
         /// <summary>
         /// 
         /// </summary>
-        public void SendTeleportFailed()
+        public void SendTeleportFailed(string reason)
         {
             TeleportFailedPacket tpFailed = (TeleportFailedPacket)PacketPool.Instance.GetPacket(PacketType.TeleportFailed);
             tpFailed.Info.AgentID = AgentId;
-            tpFailed.Info.Reason = Helpers.StringToField("unknown failure of teleport");
+            tpFailed.Info.Reason = Helpers.StringToField(reason);
             OutPacket(tpFailed, ThrottleOutPacketType.Task);
         }
 

OpenSim/Region/Communications/OGS1/OGS1GridServices.cs

@@ -594,9 +594,11 @@ namespace OpenSim.Region.Communications.OGS1
                     //don't want to be creating a new link to the remote instance every time like we are here
                     bool retValue = false;
 
-
+                    checkRegion(regInfo.RemotingAddress, regInfo.RemotingPort);
-                    OGS1InterRegionRemoting remObject = (OGS1InterRegionRemoting) Activator.GetObject(
+                    if (Available)
-                                                                                      typeof (OGS1InterRegionRemoting),
+                    {
+                        OGS1InterRegionRemoting remObject = (OGS1InterRegionRemoting)Activator.GetObject(
+                                                                                          typeof(OGS1InterRegionRemoting),
                                                                                           "tcp://" + regInfo.RemotingAddress +
                                                                                           ":" + regInfo.RemotingPort +
                                                                                           "/InterRegions");
@@ -617,6 +619,7 @@ namespace OpenSim.Region.Communications.OGS1
 
                         return retValue;
                     }
+                }
 
                 return false;
             }
@@ -1085,5 +1088,41 @@ namespace OpenSim.Region.Communications.OGS1
         #endregion
 
         #endregion
+
+        // helper to see if remote region is up
+        bool m_bAvailable = false;
+        int timeOut = 15000; //15 seconds
+
+        public void checkRegion(string address, uint port)
+        {
+            IPAddress ia = null;
+            IPAddress.TryParse(address, out ia);
+            IPEndPoint m_EndPoint = new IPEndPoint(ia, (int)port);
+            AsyncCallback ConnectedMethodCallback = new AsyncCallback(ConnectedMethod);
+            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+            IAsyncResult ar = socket.BeginConnect(m_EndPoint, ConnectedMethodCallback, socket);
+            ar.AsyncWaitHandle.WaitOne(timeOut, false);
+            socket.Close();
         }
+
+        public bool Available
+        {
+            get { return m_bAvailable; }
+        }
+
+        void ConnectedMethod(IAsyncResult ar)
+        {
+            Socket socket = (Socket)ar.AsyncState;
+            try
+            {
+                socket.EndConnect(ar);
+                m_bAvailable = true;
+            }
+            catch (Exception)
+            {
+            }
+            socket.Close();
+        }
+    }
+
 }

OpenSim/Region/Environment/Scenes/SceneCommunicationService.cs

@@ -420,11 +420,13 @@ namespace OpenSim.Region.Environment.Scenes
                     agent.InventoryFolder = LLUUID.Zero;
                     agent.startpos = position;
                     agent.child = true;
-                    avatar.Close();
+
-                    if (m_commsProvider.InterRegion.InformRegionOfChildAgent(regionHandle, agent) &&
+
-                    m_commsProvider.InterRegion.ExpectAvatarCrossing(regionHandle, avatar.ControllingClient.AgentId,
+                    if(m_commsProvider.InterRegion.InformRegionOfChildAgent(regionHandle, agent))
-                                                                     position, false)) ;
                     {
+                        avatar.Close();
+                        m_commsProvider.InterRegion.ExpectAvatarCrossing(regionHandle, avatar.ControllingClient.AgentId,
+                                                                     position, false);
                         AgentCircuitData circuitdata = avatar.ControllingClient.RequestClientInfo();
                         string capsPath = Util.GetCapsURL(avatar.ControllingClient.AgentId);
                         avatar.ControllingClient.SendRegionTeleport(regionHandle, 13, reg.ExternalEndPoint, 4, (1 << 4),
@@ -443,6 +445,10 @@ namespace OpenSim.Region.Environment.Scenes
                             CloseChildAgentConnections(avatar);
                         }
                     }
+                    else
+                    {
+                        avatar.ControllingClient.SendTeleportFailed("Remote Region appears to be down");
+                    }
                 }
             }
         }

OpenSim/Region/Examples/SimpleApp/MyNpcCharacter.cs

@@ -285,7 +285,7 @@ namespace SimpleApp
         {
         }
 
-        public virtual void SendTeleportFailed()
+        public virtual void SendTeleportFailed(string reason)
         {
         }