* Fix http://opensimulator.org/mantis/view.php?id=2189

* Allow a grid mode region simulator to properly shutdown even if the grid service is offline

OpenSim/Framework/Communications/IGridServices.cs

@@ -47,6 +47,12 @@ namespace OpenSim.Framework.Communications
         /// <exception cref="System.Exception">Thrown if region registration failed</exception>
         RegionCommsListener RegisterRegion(RegionInfo regionInfos);
 
+        /// <summary>
+        /// Deregister a region with the grid service.
+        /// </summary>
+        /// <param name="regionInfo"></param>
+        /// <returns></returns>
+        /// <exception cref="System.Exception">Thrown if region deregistration failed</exception>
         bool DeregisterRegion(RegionInfo regionInfo);   
 
         /// <summary>

OpenSim/Region/ClientStack/LindenUDP/LLPacketHandler.cs

@@ -96,6 +96,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         // A list of the packets we haven't acked yet
         //
         private Dictionary<uint,uint> m_PendingAcks = new Dictionary<uint,uint>();
+        
         // Dictionary of the packets that need acks from the client.
         //
         private class AckData
@@ -109,6 +110,7 @@ namespace OpenSim.Region.ClientStack.LindenUDP
             public Packet Packet;
             public Object Identifier;
         }
+        
         private Dictionary<uint, AckData> m_NeedAck =
                 new Dictionary<uint, AckData>();
 

OpenSim/Region/Communications/OGS1/OGS1GridServices.cs

@@ -141,11 +141,11 @@ namespace OpenSim.Region.Communications.OGS1
             SendParams.Add(GridParams);
 
             // Send Request
+            XmlRpcRequest GridReq = new XmlRpcRequest("simulator_login", SendParams);
             XmlRpcResponse GridResp;
+            
             try
             {                
-                XmlRpcRequest GridReq = new XmlRpcRequest("simulator_login", SendParams);
-
                 // The timeout should always be significantly larger than the timeout for the grid server to request
                 // the initial status of the region before confirming registration.
                 GridResp = GridReq.Send(serversInfo.GridURL, 90000);
@@ -154,7 +154,9 @@ namespace OpenSim.Region.Communications.OGS1
             {
                 Exception e2
                     = new Exception(
-                        String.Format("Unable to connect to grid at {0}. Grid service not running?", serversInfo.GridURL),
+                        String.Format(
+                            "Unable to register region with grid at {0}. Grid service not running?", 
+                            serversInfo.GridURL),
                         e);
 
                 throw(e2);
@@ -193,6 +195,7 @@ namespace OpenSim.Region.Communications.OGS1
             return m_localBackend.RegisterRegion(regionInfo);
         }
 
+        // see IGridServices
         public bool DeregisterRegion(RegionInfo regionInfo)
         {
             Hashtable GridParams = new Hashtable();
@@ -205,7 +208,24 @@ namespace OpenSim.Region.Communications.OGS1
 
             // Send Request
             XmlRpcRequest GridReq = new XmlRpcRequest("simulator_after_region_moved", SendParams);
-            XmlRpcResponse GridResp = GridReq.Send(serversInfo.GridURL, 10000);
+            XmlRpcResponse GridResp = null;
+            
+            try
+            {            
+                GridResp = GridReq.Send(serversInfo.GridURL, 10000);
+            }
+            catch (Exception e)
+            {
+                Exception e2
+                    = new Exception(
+                        String.Format(
+                            "Unable to deregister region with grid at {0}. Grid service not running?", 
+                            serversInfo.GridURL),
+                        e);
+
+                throw(e2);
+            }
+        
             Hashtable GridRespData = (Hashtable) GridResp.Value;
 
             // Hashtable griddatahash = GridRespData;

OpenSim/Region/Environment/Scenes/SceneCommunicationService.cs

@@ -135,7 +135,18 @@ namespace OpenSim.Region.Environment.Scenes
                 regionCommsHost.OnAvatarCrossingIntoRegion -= AgentCrossing;
                 regionCommsHost.OnCloseAgentConnection -= CloseConnection;
                 regionCommsHost.OnGetLandData -= FetchLandData;
+                
+                try
+                {
                     m_commsProvider.GridService.DeregisterRegion(m_regionInfo);
+                }
+                catch (Exception e)
+                {
+                    m_log.ErrorFormat(
+                        "[GRID]: Deregistration of region {0} from the grid failed - {1}.  Continuing", 
+                        m_regionInfo.RegionName, e);
+                }
+                
                 regionCommsHost = null;
             }
         }