From 1fabdcc43cc2d62ff03888166582b25884056e94 Mon Sep 17 00:00:00 2001
From: Justin Clark-Casey (justincc)
Date: Fri, 26 Jul 2013 01:04:16 +0100
Subject: If a returning teleport starts to reuse a downgraded child connection
 that was a previous root agent, do not close that child agent at the end of
 the 15 sec teleport timer.

This prevents an issue if the user teleports back to the neighbour simulator of a source before 15 seconds have elapsed.
This more closely emulates observed linden behaviour, though the timeout there is 50 secs and applies to all the pre-teleport agents.
Currently sticks a DoNotClose flag on ScenePresence though this may be temporary as possibly it could be incorporated into the ETM state machine
---
 .../EntityTransfer/EntityTransferModule.cs         | 10 +++++++-
 OpenSim/Region/Framework/Scenes/Scene.cs           | 29 ++++++++++++++--------
 OpenSim/Region/Framework/Scenes/ScenePresence.cs   |  7 ++++++
 3 files changed, 34 insertions(+), 12 deletions(-)

diff --git a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
index ea2d9b5..31db778 100644
--- a/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
+++ b/OpenSim/Region/CoreModules/Framework/EntityTransfer/EntityTransferModule.cs
@@ -1054,7 +1054,15 @@ namespace OpenSim.Region.CoreModules.Framework.EntityTransfer
                 // DECREASING THE WAIT TIME HERE WILL EITHER RESULT IN A VIEWER CRASH OR
                 // IN THE AVIE BEING PLACED IN INFINITY FOR A COUPLE OF SECONDS.
                 Thread.Sleep(15000);
-                sp.Scene.IncomingCloseAgent(sp.UUID, false);
+            
+                if (!sp.DoNotClose)
+                {
+                    sp.Scene.IncomingCloseAgent(sp.UUID, false);
+                }
+                else
+                {
+                    sp.DoNotClose = false;
+                }
             }
             else
                 // now we have a child agent in this region. 
diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index 84fdef0..f4622b6 100644
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -3682,19 +3682,26 @@ namespace OpenSim.Region.Framework.Scenes
             {
                 ScenePresence sp = GetScenePresence(agent.AgentID);
     
-                if (sp != null && !sp.IsChildAgent)
+                if (sp != null)
                 {
-                    // We have a zombie from a crashed session. 
-                    // Or the same user is trying to be root twice here, won't work.
-                    // Kill it.
-                    m_log.WarnFormat(
-                        "[SCENE]: Existing root scene presence detected for {0} {1} in {2} when connecting.  Removing existing presence.",
-                        sp.Name, sp.UUID, RegionInfo.RegionName);
-    
-                    if (sp.ControllingClient != null)
-                        sp.ControllingClient.Close(true);
+                    if (!sp.IsChildAgent)
+                    {
+                        // We have a zombie from a crashed session. 
+                        // Or the same user is trying to be root twice here, won't work.
+                        // Kill it.
+                        m_log.WarnFormat(
+                            "[SCENE]: Existing root scene presence detected for {0} {1} in {2} when connecting.  Removing existing presence.",
+                            sp.Name, sp.UUID, RegionInfo.RegionName);
+        
+                        if (sp.ControllingClient != null)
+                            sp.ControllingClient.Close(true);
 
-                    sp = null;
+                        sp = null;
+                    }
+                    else
+                    {
+                        sp.DoNotClose = true;
+                    }
                 }
 
                 // Optimistic: add or update the circuit data with the new agent circuit data and teleport flags.
diff --git a/OpenSim/Region/Framework/Scenes/ScenePresence.cs b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
index f9190d9..d3e1946 100644
--- a/OpenSim/Region/Framework/Scenes/ScenePresence.cs
+++ b/OpenSim/Region/Framework/Scenes/ScenePresence.cs
@@ -717,6 +717,13 @@ namespace OpenSim.Region.Framework.Scenes
             }
         }
 
+        /// <summary>
+        /// Used by the entity transfer module to signal when the presence should not be closed because a subsequent
+        /// teleport is reusing the connection.
+        /// </summary>
+        /// <remarks>May be refactored or move somewhere else soon.</remarks>
+        public bool DoNotClose { get; set; }
+
         private float m_speedModifier = 1.0f;
 
         public float SpeedModifier
-- 
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