Merge branch 'xassetservice'

5 files changed, 747 insertions, 3 deletions

diff --git a/OpenSim/Data/MySQL/MySQLXAssetData.cs b/OpenSim/Data/MySQL/MySQLXAssetData.cs
new file mode 100644
index 0000000..95ef72a
--- /dev/null
+++ b/OpenSim/Data/MySQL/MySQLXAssetData.cs
@@ -0,0 +1,500 @@
+/*
+ * 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 OpenSimulator 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;
+using System.Collections.Generic;
+using System.Data;
+using System.IO;
+using System.IO.Compression;
+using System.Reflection;
+using System.Security.Cryptography;
+using System.Text;
+using log4net;
+using MySql.Data.MySqlClient;
+using OpenMetaverse;
+using OpenSim.Framework;
+using OpenSim.Data;
+
+namespace OpenSim.Data.MySQL
+{
+    public class MySQLXAssetData : AssetDataBase
+    {
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
+        protected virtual Assembly Assembly
+        {
+            get { return GetType().Assembly; }
+        }
+
+        private bool m_enableCompression = false;
+        private string m_connectionString;
+        private object m_dbLock = new object();
+
+        /// <summary>
+        /// We can reuse this for all hashing since all methods are single-threaded through m_dbBLock
+        /// </summary>
+        private HashAlgorithm hasher = new SHA256CryptoServiceProvider();
+
+        #region IPlugin Members
+
+        public override string Version { get { return "1.0.0.0"; } }
+
+        /// <summary>
+        /// <para>Initialises Asset interface</para>
+        /// <para>
+        /// <list type="bullet">
+        /// <item>Loads and initialises the MySQL storage plugin.</item>
+        /// <item>Warns and uses the obsolete mysql_connection.ini if connect string is empty.</item>
+        /// <item>Check for migration</item>
+        /// </list>
+        /// </para>
+        /// </summary>
+        /// <param name="connect">connect string</param>
+        public override void Initialise(string connect)
+        {
+            m_log.ErrorFormat("[MYSQL XASSETDATA]: ***********************************************************");
+            m_log.ErrorFormat("[MYSQL XASSETDATA]: ***********************************************************");
+            m_log.ErrorFormat("[MYSQL XASSETDATA]: ***********************************************************");
+            m_log.ErrorFormat("[MYSQL XASSETDATA]: THIS PLUGIN IS STRICTLY EXPERIMENTAL.");
+            m_log.ErrorFormat("[MYSQL XASSETDATA]: DO NOT USE FOR ANY DATA THAT YOU DO NOT MIND LOSING.");
+            m_log.ErrorFormat("[MYSQL XASSETDATA]: DATABASE TABLES CAN CHANGE AT ANY TIME, CAUSING EXISTING DATA TO BE LOST.");
+            m_log.ErrorFormat("[MYSQL XASSETDATA]: ***********************************************************");
+            m_log.ErrorFormat("[MYSQL XASSETDATA]: ***********************************************************");
+            m_log.ErrorFormat("[MYSQL XASSETDATA]: ***********************************************************");
+
+            m_connectionString = connect;
+
+            using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
+            {
+                dbcon.Open();
+                Migration m = new Migration(dbcon, Assembly, "XAssetStore");
+                m.Update();
+            }
+        }
+
+        public override void Initialise()
+        {
+            throw new NotImplementedException();
+        }
+
+        public override void Dispose() { }
+
+        /// <summary>
+        /// The name of this DB provider
+        /// </summary>
+        override public string Name
+        {
+            get { return "MySQL XAsset storage engine"; }
+        }
+
+        #endregion
+
+        #region IAssetDataPlugin Members
+
+        /// <summary>
+        /// Fetch Asset <paramref name="assetID"/> from database
+        /// </summary>
+        /// <param name="assetID">Asset UUID to fetch</param>
+        /// <returns>Return the asset</returns>
+        /// <remarks>On failure : throw an exception and attempt to reconnect to database</remarks>
+        override public AssetBase GetAsset(UUID assetID)
+        {
+//            m_log.DebugFormat("[MYSQL XASSET DATA]: Looking for asset {0}", assetID);
+
+            AssetBase asset = null;
+            lock (m_dbLock)
+            {
+                using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
+                {
+                    dbcon.Open();
+
+                    using (MySqlCommand cmd = new MySqlCommand(
+                        "SELECT name, description, asset_type, local, temporary, asset_flags, creator_id, data FROM xassetsmeta JOIN xassetsdata ON xassetsmeta.hash = xassetsdata.hash WHERE id=?id",
+                        dbcon))
+                    {
+                        cmd.Parameters.AddWithValue("?id", assetID.ToString());
+
+                        try
+                        {
+                            using (MySqlDataReader dbReader = cmd.ExecuteReader(CommandBehavior.SingleRow))
+                            {
+                                if (dbReader.Read())
+                                {
+                                    asset = new AssetBase(assetID, (string)dbReader["name"], (sbyte)dbReader["asset_type"], dbReader["creator_id"].ToString());
+                                    asset.Data = (byte[])dbReader["data"];
+                                    asset.Description = (string)dbReader["description"];
+
+                                    string local = dbReader["local"].ToString();
+                                    if (local.Equals("1") || local.Equals("true", StringComparison.InvariantCultureIgnoreCase))
+                                        asset.Local = true;
+                                    else
+                                        asset.Local = false;
+
+                                    asset.Temporary = Convert.ToBoolean(dbReader["temporary"]);
+                                    asset.Flags = (AssetFlags)Convert.ToInt32(dbReader["asset_flags"]);
+
+                                    if (m_enableCompression)
+                                    {
+                                        using (GZipStream decompressionStream = new GZipStream(new MemoryStream(asset.Data), CompressionMode.Decompress))
+                                        {
+                                            MemoryStream outputStream = new MemoryStream();
+                                            WebUtil.CopyTo(decompressionStream, outputStream, int.MaxValue);
+    //                                        int compressedLength = asset.Data.Length;
+                                            asset.Data = outputStream.ToArray();
+    
+    //                                        m_log.DebugFormat(
+    //                                            "[XASSET DB]: Decompressed {0} {1} to {2} bytes from {3}",
+    //                                            asset.ID, asset.Name, asset.Data.Length, compressedLength);
+                                        }
+                                    }
+                                }
+                            }
+                        }
+                        catch (Exception e)
+                        {
+                            m_log.Error("[MYSQL XASSET DATA]: MySql failure fetching asset " + assetID + ": " + e.Message);
+                        }
+                    }
+                }
+            }
+
+            return asset;
+        }
+
+        /// <summary>
+        /// Create an asset in database, or update it if existing.
+        /// </summary>
+        /// <param name="asset">Asset UUID to create</param>
+        /// <remarks>On failure : Throw an exception and attempt to reconnect to database</remarks>
+        override public void StoreAsset(AssetBase asset)
+        {
+            lock (m_dbLock)
+            {
+                using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
+                {
+                    dbcon.Open();
+
+                    using (MySqlTransaction transaction = dbcon.BeginTransaction())
+                    {
+                        string assetName = asset.Name;
+                        if (asset.Name.Length > 64)
+                        {
+                            assetName = asset.Name.Substring(0, 64);
+                            m_log.Warn("[XASSET DB]: Name field truncated from " + asset.Name.Length + " to " + assetName.Length + " characters on add");
+                        }
+    
+                        string assetDescription = asset.Description;
+                        if (asset.Description.Length > 64)
+                        {
+                            assetDescription = asset.Description.Substring(0, 64);
+                            m_log.Warn("[XASSET DB]: Description field truncated from " + asset.Description.Length + " to " + assetDescription.Length + " characters on add");
+                        }
+
+                        if (m_enableCompression)
+                        {
+                            MemoryStream outputStream = new MemoryStream();
+
+                            using (GZipStream compressionStream = new GZipStream(outputStream, CompressionMode.Compress, false))
+                            {
+    //                            Console.WriteLine(WebUtil.CopyTo(new MemoryStream(asset.Data), compressionStream, int.MaxValue));
+                                // We have to close the compression stream in order to make sure it writes everything out to the underlying memory output stream.
+                                compressionStream.Close();
+                                byte[] compressedData = outputStream.ToArray();
+                                asset.Data = compressedData;
+                            }
+                        }
+
+                        byte[] hash = hasher.ComputeHash(asset.Data);
+
+//                        m_log.DebugFormat(
+//                            "[XASSET DB]: Compressed data size for {0} {1}, hash {2} is {3}",
+//                            asset.ID, asset.Name, hash, compressedData.Length);
+
+                        try
+                        {
+                            using (MySqlCommand cmd =
+                                new MySqlCommand(
+                                    "replace INTO xassetsmeta(id, hash, name, description, asset_type, local, temporary, create_time, access_time, asset_flags, creator_id)" +
+                                    "VALUES(?id, ?hash, ?name, ?description, ?asset_type, ?local, ?temporary, ?create_time, ?access_time, ?asset_flags, ?creator_id)",
+                                    dbcon))
+                            {
+                                // create unix epoch time
+                                int now = (int)Utils.DateTimeToUnixTime(DateTime.UtcNow);
+                                cmd.Parameters.AddWithValue("?id", asset.ID);
+                                cmd.Parameters.AddWithValue("?hash", hash);
+                                cmd.Parameters.AddWithValue("?name", assetName);
+                                cmd.Parameters.AddWithValue("?description", assetDescription);
+                                cmd.Parameters.AddWithValue("?asset_type", asset.Type);
+                                cmd.Parameters.AddWithValue("?local", asset.Local);
+                                cmd.Parameters.AddWithValue("?temporary", asset.Temporary);
+                                cmd.Parameters.AddWithValue("?create_time", now);
+                                cmd.Parameters.AddWithValue("?access_time", now);
+                                cmd.Parameters.AddWithValue("?creator_id", asset.Metadata.CreatorID);
+                                cmd.Parameters.AddWithValue("?asset_flags", (int)asset.Flags);
+                                cmd.ExecuteNonQuery();
+                            }
+                        }
+                        catch (Exception e)
+                        {
+                            m_log.ErrorFormat("[ASSET DB]: MySQL failure creating asset metadata {0} with name \"{1}\". Error: {2}",
+                                asset.FullID, asset.Name, e.Message);
+
+                            transaction.Rollback();
+
+                            return;
+                        }
+
+                        if (!ExistsData(dbcon, transaction, hash))
+                        {
+                            try
+                            {
+                                using (MySqlCommand cmd =
+                                    new MySqlCommand(
+                                        "INSERT INTO xassetsdata(hash, data) VALUES(?hash, ?data)",
+                                        dbcon))
+                                {
+                                    cmd.Parameters.AddWithValue("?hash", hash);
+                                    cmd.Parameters.AddWithValue("?data", asset.Data);
+                                    cmd.ExecuteNonQuery();
+                                }
+                            }
+                            catch (Exception e)
+                            {
+                                m_log.ErrorFormat("[XASSET DB]: MySQL failure creating asset data {0} with name \"{1}\". Error: {2}",
+                                    asset.FullID, asset.Name, e.Message);
+    
+                                transaction.Rollback();
+    
+                                return;
+                            }
+                        }
+    
+                        transaction.Commit();
+                    }
+                }
+            }
+        }
+
+//        private void UpdateAccessTime(AssetBase asset)
+//        {
+//            lock (m_dbLock)
+//            {
+//                using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
+//                {
+//                    dbcon.Open();
+//                    MySqlCommand cmd =
+//                        new MySqlCommand("update assets set access_time=?access_time where id=?id",
+//                                         dbcon);
+//
+//                    // need to ensure we dispose
+//                    try
+//                    {
+//                        using (cmd)
+//                        {
+//                            // create unix epoch time
+//                            int now = (int)Utils.DateTimeToUnixTime(DateTime.UtcNow);
+//                            cmd.Parameters.AddWithValue("?id", asset.ID);
+//                            cmd.Parameters.AddWithValue("?access_time", now);
+//                            cmd.ExecuteNonQuery();
+//                            cmd.Dispose();
+//                        }
+//                    }
+//                    catch (Exception e)
+//                    {
+//                        m_log.ErrorFormat(
+//                            "[ASSETS DB]: " +
+//                            "MySql failure updating access_time for asset {0} with name {1}" + Environment.NewLine + e.ToString()
+//                            + Environment.NewLine + "Attempting reconnection", asset.FullID, asset.Name);
+//                    }
+//                }
+//            }
+//
+//        }
+
+        /// <summary>
+        /// We assume we already have the m_dbLock.
+        /// </summary>
+        /// TODO: need to actually use the transaction.
+        /// <param name="dbcon"></param>
+        /// <param name="transaction"></param>
+        /// <param name="hash"></param>
+        /// <returns></returns>
+        private bool ExistsData(MySqlConnection dbcon, MySqlTransaction transaction, byte[] hash)
+        {
+//            m_log.DebugFormat("[ASSETS DB]: Checking for asset {0}", uuid);
+
+            bool exists = false;
+
+            using (MySqlCommand cmd = new MySqlCommand("SELECT hash FROM xassetsdata WHERE hash=?hash", dbcon))
+            {
+                cmd.Parameters.AddWithValue("?hash", hash);
+
+                try
+                {
+                    using (MySqlDataReader dbReader = cmd.ExecuteReader(CommandBehavior.SingleRow))
+                    {
+                        if (dbReader.Read())
+                        {
+//                                    m_log.DebugFormat("[ASSETS DB]: Found asset {0}", uuid);
+                            exists = true;
+                        }
+                    }
+                }
+                catch (Exception e)
+                {
+                    m_log.ErrorFormat(
+                        "[XASSETS DB]: MySql failure in ExistsData fetching hash {0}.  Exception {1}{2}",
+                        hash, e.Message, e.StackTrace);
+                }
+            }
+
+            return exists;
+        }
+
+        /// <summary>
+        /// Check if the asset exists in the database
+        /// </summary>
+        /// <param name="uuid">The asset UUID</param>
+        /// <returns>true if it exists, false otherwise.</returns>
+        override public bool ExistsAsset(UUID uuid)
+        {
+//            m_log.DebugFormat("[ASSETS DB]: Checking for asset {0}", uuid);
+
+            bool assetExists = false;
+
+            lock (m_dbLock)
+            {
+                using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
+                {
+                    dbcon.Open();
+                    using (MySqlCommand cmd = new MySqlCommand("SELECT id FROM xassetsmeta WHERE id=?id", dbcon))
+                    {
+                        cmd.Parameters.AddWithValue("?id", uuid.ToString());
+
+                        try
+                        {
+                            using (MySqlDataReader dbReader = cmd.ExecuteReader(CommandBehavior.SingleRow))
+                            {
+                                if (dbReader.Read())
+                                {
+//                                    m_log.DebugFormat("[ASSETS DB]: Found asset {0}", uuid);
+                                    assetExists = true;
+                                }
+                            }
+                        }
+                        catch (Exception e)
+                        {
+                            m_log.ErrorFormat(
+                                "[XASSETS DB]: MySql failure fetching asset {0}" + Environment.NewLine + e.ToString(), uuid);
+                        }
+                    }
+                }
+            }
+
+            return assetExists;
+        }
+
+        /// <summary>
+        /// Returns a list of AssetMetadata objects. The list is a subset of
+        /// the entire data set offset by <paramref name="start" /> containing
+        /// <paramref name="count" /> elements.
+        /// </summary>
+        /// <param name="start">The number of results to discard from the total data set.</param>
+        /// <param name="count">The number of rows the returned list should contain.</param>
+        /// <returns>A list of AssetMetadata objects.</returns>
+        public override List<AssetMetadata> FetchAssetMetadataSet(int start, int count)
+        {
+            List<AssetMetadata> retList = new List<AssetMetadata>(count);
+
+            lock (m_dbLock)
+            {
+                using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
+                {
+                    dbcon.Open();
+                    MySqlCommand cmd = new MySqlCommand("SELECT name,description,asset_type,temporary,id,asset_flags,creator_id FROM xassetsmeta LIMIT ?start, ?count", dbcon);
+                    cmd.Parameters.AddWithValue("?start", start);
+                    cmd.Parameters.AddWithValue("?count", count);
+
+                    try
+                    {
+                        using (MySqlDataReader dbReader = cmd.ExecuteReader())
+                        {
+                            while (dbReader.Read())
+                            {
+                                AssetMetadata metadata = new AssetMetadata();
+                                metadata.Name = (string)dbReader["name"];
+                                metadata.Description = (string)dbReader["description"];
+                                metadata.Type = (sbyte)dbReader["asset_type"];
+                                metadata.Temporary = Convert.ToBoolean(dbReader["temporary"]); // Not sure if this is correct.
+                                metadata.Flags = (AssetFlags)Convert.ToInt32(dbReader["asset_flags"]);
+                                metadata.FullID = DBGuid.FromDB(dbReader["id"]);
+                                metadata.CreatorID = dbReader["creator_id"].ToString();
+
+                                // We'll ignore this for now - it appears unused!
+//                                metadata.SHA1 = dbReader["hash"]);
+
+                                retList.Add(metadata);
+                            }
+                        }
+                    }
+                    catch (Exception e)
+                    {
+                        m_log.Error("[XASSETS DB]: MySql failure fetching asset set" + Environment.NewLine + e.ToString());
+                    }
+                }
+            }
+
+            return retList;
+        }
+
+        public override bool Delete(string id)
+        {
+//            m_log.DebugFormat("[XASSETS DB]: Deleting asset {0}", id);
+
+            lock (m_dbLock)
+            {
+                using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
+                {
+                    dbcon.Open();
+
+                    using (MySqlCommand cmd = new MySqlCommand("delete from xassetsmeta where id=?id", dbcon))
+                    {
+                        cmd.Parameters.AddWithValue("?id", id);
+                        cmd.ExecuteNonQuery();
+                    }
+
+                    // TODO: How do we deal with data from deleted assets?  Probably not easily reapable unless we
+                    // keep a reference count (?)
+                }
+            }
+
+            return true;
+        }
+
+        #endregion
+    }
+}
\ No newline at end of file
diff --git a/OpenSim/Data/MySQL/Resources/XAssetStore.migrations b/OpenSim/Data/MySQL/Resources/XAssetStore.migrations
new file mode 100644
index 0000000..d3cca5e
--- /dev/null
+++ b/OpenSim/Data/MySQL/Resources/XAssetStore.migrations
@@ -0,0 +1,27 @@
+# -----------------
+:VERSION 1
+
+BEGIN;
+
+CREATE TABLE `xassetsmeta` (
+  `id` char(36) NOT NULL,
+  `hash` binary(32) NOT NULL,
+  `name` varchar(64) NOT NULL,
+  `description` varchar(64) NOT NULL,
+  `asset_type` tinyint(4) NOT NULL,
+  `local` tinyint(1) NOT NULL,
+  `temporary` tinyint(1) NOT NULL,
+  `create_time` int(11) NOT NULL,
+  `access_time` int(11) NOT NULL,
+  `asset_flags` int(11) NOT NULL,
+  `creator_id` varchar(128) NOT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Version 1';
+
+CREATE TABLE `xassetsdata` (
+  `hash` binary(32) NOT NULL,
+  `data` longblob NOT NULL,
+  PRIMARY KEY (`hash`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Version 1';
+
+COMMIT;
\ No newline at end of file
diff --git a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Asset/LocalAssetServiceConnector.cs b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Asset/LocalAssetServiceConnector.cs
index 2e6ec90..c78915f 100644
--- a/OpenSim/Region/CoreModules/ServiceConnectorsOut/Asset/LocalAssetServiceConnector.cs
+++ b/OpenSim/Region/CoreModules/ServiceConnectorsOut/Asset/LocalAssetServiceConnector.cs
@@ -73,14 +73,17 @@ namespace OpenSim.Region.CoreModules.ServiceConnectorsOut.Asset
                         return;
                     }
 
-                    string serviceDll = assetConfig.GetString("LocalServiceModule",
-                            String.Empty);
+                    string serviceDll = assetConfig.GetString("LocalServiceModule", String.Empty);
 
                     if (serviceDll == String.Empty)
                     {
                         m_log.Error("[LOCAL ASSET SERVICES CONNECTOR]: No LocalServiceModule named in section AssetService");
                         return;
                     }
+                    else
+                    {
+                        m_log.DebugFormat("[LOCAL ASSET SERVICES CONNECTOR]: Loading asset service at {0}", serviceDll);
+                    }
 
                     Object[] args = new Object[] { source };
                     m_AssetService = ServerUtils.LoadPlugin<IAssetService>(serviceDll, args);
diff --git a/OpenSim/Services/AssetService/XAssetService.cs b/OpenSim/Services/AssetService/XAssetService.cs
new file mode 100644
index 0000000..d161c58
--- /dev/null
+++ b/OpenSim/Services/AssetService/XAssetService.cs
@@ -0,0 +1,213 @@
+/*
+ * 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 OpenSimulator 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;
+using System.Collections.Generic;
+using System.IO;
+using System.Reflection;
+using Nini.Config;
+using log4net;
+using OpenSim.Framework;
+using OpenSim.Data;
+using OpenSim.Services.Interfaces;
+using OpenMetaverse;
+
+namespace OpenSim.Services.AssetService
+{
+    /// <summary>
+    /// This will be developed into a de-duplicating asset service.
+    /// XXX: Currently it's a just a copy of the existing AssetService. so please don't attempt to use it.
+    /// </summary>
+    public class XAssetService : AssetServiceBase, IAssetService
+    {
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
+        protected static XAssetService m_RootInstance;
+
+        public XAssetService(IConfigSource config) : base(config)
+        {
+            if (m_RootInstance == null)
+            {
+                m_RootInstance = this;
+
+                if (m_AssetLoader != null)
+                {
+                    IConfig assetConfig = config.Configs["AssetService"];
+                    if (assetConfig == null)
+                        throw new Exception("No AssetService configuration");
+
+                    string loaderArgs = assetConfig.GetString("AssetLoaderArgs",
+                            String.Empty);
+
+                    bool assetLoaderEnabled = assetConfig.GetBoolean("AssetLoaderEnabled", true);
+
+                    if (assetLoaderEnabled)
+                    {
+                        m_log.DebugFormat("[XASSET SERVICE]: Loading default asset set from {0}", loaderArgs);
+
+                        m_AssetLoader.ForEachDefaultXmlAsset(
+                            loaderArgs,
+                            delegate(AssetBase a)
+                            {
+                                AssetBase existingAsset = Get(a.ID);
+//                                AssetMetadata existingMetadata = GetMetadata(a.ID);
+
+                                if (existingAsset == null || Util.SHA1Hash(existingAsset.Data) != Util.SHA1Hash(a.Data))
+                                {
+//                                    m_log.DebugFormat("[ASSET]: Storing {0} {1}", a.Name, a.ID);
+                                    Store(a);
+                                }
+                            });
+                    }
+
+                    m_log.Debug("[XASSET SERVICE]: Local asset service enabled");
+                }
+            }
+        }
+
+        public virtual AssetBase Get(string id)
+        {
+//            m_log.DebugFormat("[ASSET SERVICE]: Get asset for {0}", id);
+            
+            UUID assetID;
+
+            if (!UUID.TryParse(id, out assetID))
+            {
+                m_log.WarnFormat("[XASSET SERVICE]: Could not parse requested asset id {0}", id);
+                return null;
+            }
+
+            try
+            {
+                return m_Database.GetAsset(assetID);
+            }
+            catch (Exception e)
+            {
+                m_log.ErrorFormat("[XASSET SERVICE]: Exception getting asset {0} {1}", assetID, e);
+                return null;
+            }
+        }
+
+        public virtual AssetBase GetCached(string id)
+        {
+            return Get(id);
+        }
+
+        public virtual AssetMetadata GetMetadata(string id)
+        {
+//            m_log.DebugFormat("[XASSET SERVICE]: Get asset metadata for {0}", id);
+            
+            UUID assetID;
+
+            if (!UUID.TryParse(id, out assetID))
+                return null;
+
+            AssetBase asset = m_Database.GetAsset(assetID);
+            if (asset != null)
+                return asset.Metadata;
+
+            return null;
+        }
+
+        public virtual byte[] GetData(string id)
+        {
+//            m_log.DebugFormat("[XASSET SERVICE]: Get asset data for {0}", id);
+
+            UUID assetID;
+
+            if (!UUID.TryParse(id, out assetID))
+                return null;
+
+            AssetBase asset = m_Database.GetAsset(assetID);
+            return asset.Data;
+        }
+
+        public virtual bool Get(string id, Object sender, AssetRetrieved handler)
+        {
+            //m_log.DebugFormat("[XASSET SERVICE]: Get asset async {0}", id);
+            
+            UUID assetID;
+
+            if (!UUID.TryParse(id, out assetID))
+                return false;
+
+            AssetBase asset = m_Database.GetAsset(assetID);
+
+            //m_log.DebugFormat("[XASSET SERVICE]: Got asset {0}", asset);
+            
+            handler(id, sender, asset);
+
+            return true;
+        }
+
+        public virtual string Store(AssetBase asset)
+        {
+            if (!m_Database.ExistsAsset(asset.FullID))
+            {
+//                m_log.DebugFormat(
+//                    "[XASSET SERVICE]: Storing asset {0} {1}, bytes {2}", asset.Name, asset.FullID, asset.Data.Length);
+                m_Database.StoreAsset(asset);
+            }
+//            else
+//            {
+//                m_log.DebugFormat(
+//                    "[XASSET SERVICE]: Not storing asset {0} {1}, bytes {2} as it already exists", asset.Name, asset.FullID, asset.Data.Length);
+//            }
+
+            return asset.ID;
+        }
+
+        public bool UpdateContent(string id, byte[] data)
+        {
+            return false;
+        }
+
+        public virtual bool Delete(string id)
+        {
+            m_log.DebugFormat("[XASSET SERVICE]: Deleting asset {0}", id);
+            UUID assetID;
+            if (!UUID.TryParse(id, out assetID))
+                return false;
+
+            AssetBase asset = m_Database.GetAsset(assetID);
+            if (asset == null)
+                return false;
+
+            if ((int)(asset.Flags & AssetFlags.Maptile) != 0)
+            {
+                return m_Database.Delete(id);
+            }
+            else
+            {
+                m_log.DebugFormat("[XASSET SERVICE]: Request to delete asset {0}, but flags are not Maptile", id);
+            }
+
+            return false;
+        }
+    }
+}
+
diff --git a/prebuild.xml b/prebuild.xml
index 6d25323..f8d03f3 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -2052,9 +2052,10 @@
 
       <ReferencePath>../../../bin/</ReferencePath>
       <Reference name="System"/>
-      <Reference name="System.Xml"/>
+      <Reference name="System.Core"/>
       <Reference name="System.Data"/>
       <Reference name="System.Drawing"/>
+      <Reference name="System.Xml"/>
       <Reference name="OpenSim.Framework"/>
       <Reference name="OpenSim.Data"/>
       <Reference name="OpenMetaverseTypes" path="../../../bin/"/>