* Add very very very basic initial statistical information collection to asset server

* stats can be seen by typing stats on the asset server command line
* Currently collecting only raw requests for today and yesterday
* And I haven't yet tested the 24 hour rollover

OpenSim/Grid/AssetServer/AssetStatsReporter.cs

@@ -0,0 +1,82 @@
+/*
+* Copyright (c) Contributors, http://opensimulator.org/
+* See CONTRIBUTORS.TXT for a full list of copyright holders.
+*
+* Redistribution and use in source and binary forms, with or without
+* modification, are permitted provided that the following conditions are met:
+*     * Redistributions of source code must retain the above copyright
+*       notice, this list of conditions and the following disclaimer.
+*     * Redistributions in binary form must reproduce the above copyright
+*       notice, this list of conditions and the following disclaimer in the
+*       documentation and/or other materials provided with the distribution.
+*     * Neither the name of the OpenSim Project nor the
+*       names of its contributors may be used to endorse or promote products
+*       derived from this software without specific prior written permission.
+*
+* THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY
+* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+* DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTORS BE LIABLE FOR ANY
+* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+* 
+*/
+
+using System.Text;
+using System.Timers;
+
+namespace OpenSim.Grid.AssetServer
+{
+    /// <summary>
+    /// Collects and reports information on the requests made to the asset server
+    /// </summary>
+    public class AssetStatsReporter
+    {
+        private Timer ageStatsTimer = new Timer(24 * 60 * 60);
+        
+        private long assetRequestsToday;
+        public long AssetRequestsToday { get { return assetRequestsToday; } }
+        
+        private long assetRequestsYesterday;
+        public long AssetRequestsYesterday { get { return assetRequestsYesterday; } }       
+        
+        public AssetStatsReporter()
+        {
+            ageStatsTimer.Elapsed += new ElapsedEventHandler(OnAgeing);
+            ageStatsTimer.Enabled = true;
+        }
+        
+        private void OnAgeing(object source, ElapsedEventArgs e)
+        {
+            assetRequestsYesterday = assetRequestsToday;
+            
+            // There is a possibility that an asset request could occur between the execution of these
+            // two statements.  But we're better off without the synchronization overhead.
+            assetRequestsToday = 0;            
+        }
+        
+        /// <summary>
+        /// Record that a request was made to the asset server
+        /// </summary>
+        public void AddRequest()
+        {
+            assetRequestsToday++;
+        }
+
+        /// <summary>
+        /// Report back collected statistical information.
+        /// </summary>
+        /// <returns></returns>
+        public string Report()
+        {
+            return string.Format(
+@"Asset requests today     : {0}
+Asset requests yesterday : {1}",
+                AssetRequestsToday, AssetRequestsYesterday);
+        }
+    }
+}

OpenSim/Grid/AssetServer/Main.cs

@@ -53,6 +53,8 @@ namespace OpenSim.Grid.AssetServer
         
         private IAssetProvider m_assetProvider;
         
+        private AssetStatsReporter stats;      
+
         [STAThread]
         public static void Main(string[] args)
         {
@@ -98,7 +100,10 @@ namespace OpenSim.Grid.AssetServer
             m_console.Verbose("ASSET", "Starting HTTP process");
             BaseHttpServer httpServer = new BaseHttpServer(m_config.HttpPort);
             
-            httpServer.AddStreamHandler(new GetAssetStreamHandler(this, m_assetProvider));
+            // XXX Hardcoded - could be a plugin later on
+            stats = new AssetStatsReporter();
+
+            httpServer.AddStreamHandler(new GetAssetStreamHandler(this, m_assetProvider, stats));
             httpServer.AddStreamHandler(new PostAssetStreamHandler(this, m_assetProvider));
 
             httpServer.Start();
@@ -172,7 +177,14 @@ namespace OpenSim.Grid.AssetServer
             switch (cmd)
             {
                 case "help":
-                    m_console.Notice("shutdown - shutdown this asset server (USE CAUTION!)");
+                    m_console.Notice(
+                        @"shutdown - shutdown this asset server (USE CAUTION!)
+                 stats    - statistical information for this asset server");                    
+                    
+                    break;
+                    
+                case "stats":
+                    MainLog.Instance.Notice("STATS", Environment.NewLine + stats.Report());
                     break;
 
                 case "shutdown":

OpenSim/Grid/AssetServer/RestService.cs

@@ -42,6 +42,17 @@ namespace OpenSim.Grid.AssetServer
     {
         private OpenAsset_Main m_assetManager;
         private IAssetProvider m_assetProvider;
+        private AssetStatsReporter m_stats;
+
+        public GetAssetStreamHandler(OpenAsset_Main assetManager, IAssetProvider assetProvider,
+                                     AssetStatsReporter stats)
+            : base("GET", "/assets")
+        {
+            MainLog.Instance.Verbose("REST", "In Get Request");
+            m_assetManager = assetManager;
+            m_assetProvider = assetProvider;
+            m_stats = stats;
+        }
         
         public override byte[] Handle(string path, Stream request)
         {
@@ -57,6 +68,8 @@ namespace OpenSim.Grid.AssetServer
                     LLUUID assetID = LLUUID.Parse(p[0]);
 
                     MainLog.Instance.Verbose("REST", "GET:/asset fetch param={0} UUID={1}", param, assetID);
+                    m_stats.AddRequest();
+                    
                     AssetBase asset = m_assetProvider.FetchAsset(assetID);
                     if (asset != null)
                     {
@@ -70,7 +83,7 @@ namespace OpenSim.Grid.AssetServer
                         xw.Flush();
 
                         ms.Seek(0, SeekOrigin.Begin);
-                        StreamReader sr = new StreamReader(ms);
+                        //StreamReader sr = new StreamReader(ms);
 
                         result = ms.GetBuffer();
                         MainLog.Instance.Verbose("REST", "Buffer: {0}", result);
@@ -88,14 +101,6 @@ namespace OpenSim.Grid.AssetServer
             }
             return result;
         }
-
-        public GetAssetStreamHandler(OpenAsset_Main assetManager, IAssetProvider assetProvider)
-            : base("GET", "/assets")
-        {
-            MainLog.Instance.Verbose("REST", "In Get Request");
-            m_assetManager = assetManager;
-            m_assetProvider = assetProvider;
-        }
     }
 
     public class PostAssetStreamHandler : BaseStreamHandler