Add ToOSDMap() overrides to the Stat subclass CounterStat.

Add a GetStatsAsOSDMap method to StatsManager which allows the filtered
fetching of stats for eventual returning over the internets.

OpenSim/Framework/Monitoring/Stats/CounterStat.cs

@@ -224,5 +224,26 @@ public class CounterStat : Stat
             }
         }
     }
+
+    // CounterStat is a basic stat plus histograms
+    public override OSDMap ToOSDMap()
+    {
+        // Get the foundational instance
+        OSDMap map = base.ToOSDMap();
+
+        map["StatType"] = "CounterStat";
+
+        // If there are any histograms, add a new field that is an array of histograms as OSDMaps
+        if (m_histograms.Count > 0)
+        {
+            OSDArray histos = new OSDArray();
+            foreach (EventHistogram histo in m_histograms.Values)
+            {
+                histos.Add(histo.GetHistogramAsOSDMap());
+            }
+            map.Add("Histograms", histos);
+        }
+        return map;
+    }
 }
 }

OpenSim/Framework/Monitoring/Stats/Stat.cs

@@ -242,6 +242,7 @@ namespace OpenSim.Framework.Monitoring
             ret.Add("Description", OSD.FromString(Description));
             ret.Add("UnitName", OSD.FromString(UnitName));
             ret.Add("Value", OSD.FromReal(Value));
+            ret.Add("StatType", "Stat");    // used by overloading classes to denote type of stat
 
             return ret;
         }

OpenSim/Framework/Monitoring/StatsManager.cs

@@ -30,6 +30,8 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 
+using OpenMetaverse.StructuredData;
+
 namespace OpenSim.Framework.Monitoring
 {
     /// <summary>
@@ -168,6 +170,70 @@ namespace OpenSim.Framework.Monitoring
             }
         }
 
+        // Creates an OSDMap of the format:
+        // { categoryName: {
+        //         containerName: {
+        //               statName: {
+        //                     "Name": name,
+        //                     "ShortName": shortName,
+        //                     ...
+        //               },
+        //               statName: {
+        //                     "Name": name,
+        //                     "ShortName": shortName,
+        //                     ...
+        //               },
+        //               ...
+        //         },
+        //         containerName: {
+        //         ...
+        //         },
+        //         ...
+        //   },
+        //   categoryName: {
+        //   ...
+        //   },
+        //   ...
+        // }
+        // The passed in parameters will filter the categories, containers and stats returned. If any of the
+        //    parameters are either EmptyOrNull or the AllSubCommand value, all of that type will be returned.
+        // Case matters.
+        public static OSDMap GetStatsAsOSDMap(string pCategoryName, string pContainerName, string pStatName)
+        {
+            OSDMap map = new OSDMap();
+
+            foreach (string catName in RegisteredStats.Keys)
+            {
+                // Do this category if null spec, "all" subcommand or category name matches passed parameter.
+                // Skip category if none of the above.
+                if (!(String.IsNullOrEmpty(pCategoryName) || pCategoryName == AllSubCommand || pCategoryName == catName))
+                    continue;
+
+                OSDMap contMap = new OSDMap();
+                foreach (string contName in RegisteredStats[catName].Keys)
+                {
+                    if (!(string.IsNullOrEmpty(pContainerName) || pContainerName == AllSubCommand || pContainerName == contName))
+                        continue;
+                    
+                    OSDMap statMap = new OSDMap();
+
+                    SortedDictionary<string, Stat> theStats = RegisteredStats[catName][contName];
+                    foreach (string statName in theStats.Keys)
+                    {
+                        if (!(String.IsNullOrEmpty(pStatName) || pStatName == AllSubCommand || pStatName == statName))
+                            continue;
+
+                        statMap.Add(statName, theStats[statName].ToOSDMap());
+                    }
+
+                    contMap.Add(contName, statMap);
+                }
+                map.Add(catName, contMap);
+            }
+
+            return map;
+        }
+
 //        /// <summary>
 //        /// Start collecting statistics related to assets.
 //        /// Should only be called once.