From e93defd0ca326754d1bd5a1a503d6d47428272be Mon Sep 17 00:00:00 2001
From: Mic Bowman
Date: Fri, 8 Feb 2013 15:07:43 -0800
Subject: Adds size limits to JsonStore. Adds a separate configuration variable
 to enable binding to dynamic attributes.

---
 .../Scripting/JsonStore/JsonStore.cs               | 51 +++++++++++++++++++++-
 1 file changed, 49 insertions(+), 2 deletions(-)

(limited to 'OpenSim/Region/OptionalModules/Scripting/JsonStore/JsonStore.cs')

diff --git a/OpenSim/Region/OptionalModules/Scripting/JsonStore/JsonStore.cs b/OpenSim/Region/OptionalModules/Scripting/JsonStore/JsonStore.cs
index c7f0001..088d0cd 100644
--- a/OpenSim/Region/OptionalModules/Scripting/JsonStore/JsonStore.cs
+++ b/OpenSim/Region/OptionalModules/Scripting/JsonStore/JsonStore.cs
@@ -95,6 +95,15 @@ namespace OpenSim.Region.OptionalModules.Scripting.JsonStore
 
         // -----------------------------------------------------------------
         /// <summary>
+        /// This is a simple estimator for the size of the stored data, it
+        /// is not precise, but should be close enough to implement reasonable
+        /// limits on the storage space used
+        /// </summary>
+        // -----------------------------------------------------------------
+        public int StringSpace { get; set; }
+        
+        // -----------------------------------------------------------------
+        /// <summary>
         /// 
         /// </summary>
         // -----------------------------------------------------------------
@@ -110,6 +119,7 @@ namespace OpenSim.Region.OptionalModules.Scripting.JsonStore
         // -----------------------------------------------------------------
         public JsonStore() 
         {
+            StringSpace = 0;
             m_TakeStore = new List<TakeValueCallbackClass>();
             m_ReadStore = new List<TakeValueCallbackClass>();
         }
@@ -247,6 +257,7 @@ namespace OpenSim.Region.OptionalModules.Scripting.JsonStore
             if (path.Count == 0)
             {
                 ValueStore = ovalue;
+                StringSpace = 0;
                 return true;
             }
 
@@ -278,8 +289,13 @@ namespace OpenSim.Region.OptionalModules.Scripting.JsonStore
                 {
                     string npkey = String.Format("[{0}]",amap.Count);
 
-                    amap.Add(ovalue);
-                    InvokeNextCallback(pexpr + npkey);
+                    if (ovalue != null)
+                    {
+                        StringSpace += ComputeSizeOf(ovalue);
+
+                        amap.Add(ovalue);
+                        InvokeNextCallback(pexpr + npkey);
+                    }
                     return true;
                 }
 
@@ -287,9 +303,14 @@ namespace OpenSim.Region.OptionalModules.Scripting.JsonStore
                 if (0 <= aval && aval < amap.Count)
                 {
                     if (ovalue == null)
+                    {
+                        StringSpace -= ComputeSizeOf(amap[aval]);
                         amap.RemoveAt(aval);
+                    }
                     else
                     {
+                        StringSpace -= ComputeSizeOf(amap[aval]);
+                        StringSpace += ComputeSizeOf(ovalue);
                         amap[aval] = ovalue;
                         InvokeNextCallback(pexpr + pkey);
                     }
@@ -313,6 +334,9 @@ namespace OpenSim.Region.OptionalModules.Scripting.JsonStore
                     OSDMap hmap = result as OSDMap;
                     if (ovalue != null)
                     {
+                        StringSpace -= ComputeSizeOf(hmap[hkey]);
+                        StringSpace += ComputeSizeOf(ovalue);
+                        
                         hmap[hkey] = ovalue;
                         InvokeNextCallback(pexpr + pkey);
                         return true;
@@ -321,6 +345,7 @@ namespace OpenSim.Region.OptionalModules.Scripting.JsonStore
                     // this is the remove case
                     if (hmap.ContainsKey(hkey))
                     {
+                        StringSpace -= ComputeSizeOf(hmap[hkey]);
                         hmap.Remove(hkey);
                         return true;
                     }
@@ -531,8 +556,27 @@ namespace OpenSim.Region.OptionalModules.Scripting.JsonStore
             
             return pkey;
         }
+
+        // -----------------------------------------------------------------
+        /// <summary>
+        /// 
+        /// </summary>
+        // -----------------------------------------------------------------
+        protected static int ComputeSizeOf(OSD value)
+        {
+            string sval;
+
+            if (ConvertOutputValue(value,out sval,true))
+                return sval.Length;
+
+            return 0;
+        }
     }
 
+    // -----------------------------------------------------------------
+    /// <summary>
+    /// </summary>
+    // -----------------------------------------------------------------
     public class JsonObjectStore : JsonStore
     {
         private static readonly ILog m_log =
@@ -566,6 +610,9 @@ namespace OpenSim.Region.OptionalModules.Scripting.JsonStore
         {
             m_scene = scene;
             m_objectID = oid;
+
+            // the size limit is imposed on whatever is already in the store
+            StringSpace = ComputeSizeOf(ValueStore);
         }
     }
     
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