1 files changed, 503 insertions, 0 deletions

diff --git a/OpenSim/Data/MySQL/MySQLXAssetData.cs b/OpenSim/Data/MySQL/MySQLXAssetData.cs
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+++ b/OpenSim/Data/MySQL/MySQLXAssetData.cs
@@ -0,0 +1,503 @@
+/*
+ * 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 : IXAssetDataPlugin
+    {
+        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
+        protected virtual Assembly Assembly
+        {
+            get { return GetType().Assembly; }
+        }
+
+        /// <summary>
+        /// Number of days that must pass before we update the access time on an asset when it has been fetched.
+        /// </summary>
+        private const int DaysBetweenAccessTimeUpdates = 30;
+
+        private bool m_enableCompression = false;
+        private string m_connectionString;
+
+        /// <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 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 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 void Initialise()
+        {
+            throw new NotImplementedException();
+        }
+
+        public void Dispose() { }
+
+        /// <summary>
+        /// The name of this DB provider
+        /// </summary>
+        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>
+        public AssetBase GetAsset(UUID assetID)
+        {
+//            m_log.DebugFormat("[MYSQL XASSET DATA]: Looking for asset {0}", assetID);
+
+            AssetBase asset = null;
+
+            using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
+            {
+                dbcon.Open();
+
+                using (MySqlCommand cmd = new MySqlCommand(
+                    "SELECT Name, Description, AccessTime, AssetType, Local, Temporary, AssetFlags, CreatorID, 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["AssetType"], dbReader["CreatorID"].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["AssetFlags"]);
+
+                                if (m_enableCompression)
+                                {
+                                    using (GZipStream decompressionStream = new GZipStream(new MemoryStream(asset.Data), CompressionMode.Decompress))
+                                    {
+                                        MemoryStream outputStream = new MemoryStream();
+                                        WebUtil.CopyStream(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);
+                                    }
+                                }
+
+                                UpdateAccessTime(asset.Metadata, (int)dbReader["AccessTime"]);
+                            }
+                        }
+                    }
+                    catch (Exception e)
+                    {
+                        m_log.Error(string.Format("[MYSQL XASSET DATA]: Failure fetching asset {0}", assetID), e);
+                    }
+                }
+            }
+
+            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>
+        public void StoreAsset(AssetBase asset)
+        {
+//            m_log.DebugFormat("[XASSETS DB]: Storing asset {0} {1}", asset.Name, asset.ID);
+
+            using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
+            {
+                dbcon.Open();
+
+                using (MySqlTransaction transaction = dbcon.BeginTransaction())
+                {
+                    string assetName = asset.Name;
+                    if (asset.Name.Length > AssetBase.MAX_ASSET_NAME)
+                    {
+                        assetName = asset.Name.Substring(0, AssetBase.MAX_ASSET_NAME);
+                        m_log.WarnFormat(
+                            "[XASSET DB]: Name '{0}' for asset {1} truncated from {2} to {3} characters on add", 
+                            asset.Name, asset.ID, asset.Name.Length, assetName.Length);
+                    }
+
+                    string assetDescription = asset.Description;
+                    if (asset.Description.Length > AssetBase.MAX_ASSET_DESC)
+                    {
+                        assetDescription = asset.Description.Substring(0, AssetBase.MAX_ASSET_DESC);
+                        m_log.WarnFormat(
+                            "[XASSET DB]: Description '{0}' for asset {1} truncated from {2} to {3} characters on add", 
+                            asset.Description, asset.ID, asset.Description.Length, assetDescription.Length);
+                    }
+
+                    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, AssetType, Local, Temporary, CreateTime, AccessTime, AssetFlags, CreatorID)" +
+                                "VALUES(?ID, ?Hash, ?Name, ?Description, ?AssetType, ?Local, ?Temporary, ?CreateTime, ?AccessTime, ?AssetFlags, ?CreatorID)",
+                                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("?AssetType", asset.Type);
+                            cmd.Parameters.AddWithValue("?Local", asset.Local);
+                            cmd.Parameters.AddWithValue("?Temporary", asset.Temporary);
+                            cmd.Parameters.AddWithValue("?CreateTime", now);
+                            cmd.Parameters.AddWithValue("?AccessTime", now);
+                            cmd.Parameters.AddWithValue("?CreatorID", asset.Metadata.CreatorID);
+                            cmd.Parameters.AddWithValue("?AssetFlags", (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();
+                }
+            }
+        }
+
+        /// <summary>
+        /// Updates the access time of the asset if it was accessed above a given threshhold amount of time.
+        /// </summary>
+        /// <remarks>
+        /// This gives us some insight into assets which haven't ben accessed for a long period.  This is only done
+        /// over the threshold time to avoid excessive database writes as assets are fetched.
+        /// </remarks>
+        /// <param name='asset'></param>
+        /// <param name='accessTime'></param>
+        private void UpdateAccessTime(AssetMetadata assetMetadata, int accessTime)
+        {
+            DateTime now = DateTime.UtcNow;
+
+            if ((now - Utils.UnixTimeToDateTime(accessTime)).TotalDays < DaysBetweenAccessTimeUpdates)
+                return;
+
+            using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
+            {
+                dbcon.Open();
+                MySqlCommand cmd =
+                    new MySqlCommand("update XAssetsMeta set AccessTime=?AccessTime where ID=?ID", dbcon);
+
+                try
+                {
+                    using (cmd)
+                    {
+                        // create unix epoch time
+                        cmd.Parameters.AddWithValue("?ID", assetMetadata.ID);
+                        cmd.Parameters.AddWithValue("?AccessTime", (int)Utils.DateTimeToUnixTime(now));
+                        cmd.ExecuteNonQuery();
+                    }
+                }
+                catch (Exception)
+                {
+                    m_log.ErrorFormat(
+                        "[XASSET MYSQL DB]: Failure updating access_time for asset {0} with name {1}", 
+                        assetMetadata.ID, assetMetadata.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 assets exist in the database.
+        /// </summary>
+        /// <param name="uuids">The asset UUID's</param>
+        /// <returns>For each asset: true if it exists, false otherwise</returns>
+        public bool[] AssetsExist(UUID[] uuids)
+        {
+            if (uuids.Length == 0)
+                return new bool[0];
+
+            HashSet<UUID> exists = new HashSet<UUID>();
+
+            string ids = "'" + string.Join("','", uuids) + "'";
+            string sql = string.Format("SELECT ID FROM assets WHERE ID IN ({0})", ids);
+
+            using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
+            {
+                dbcon.Open();
+                using (MySqlCommand cmd = new MySqlCommand(sql, dbcon))
+                {
+                    using (MySqlDataReader dbReader = cmd.ExecuteReader())
+                    {
+                        while (dbReader.Read())
+                        {
+                            UUID id = DBGuid.FromDB(dbReader["ID"]);
+                            exists.Add(id);
+                        }
+                    }
+                }
+            }
+
+            bool[] results = new bool[uuids.Length];
+            for (int i = 0; i < uuids.Length; i++)
+                results[i] = exists.Contains(uuids[i]);
+            return results;
+        }
+
+
+        /// <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 List<AssetMetadata> FetchAssetMetadataSet(int start, int count)
+        {
+            List<AssetMetadata> retList = new List<AssetMetadata>(count);
+
+            using (MySqlConnection dbcon = new MySqlConnection(m_connectionString))
+            {
+                dbcon.Open();
+                MySqlCommand cmd = new MySqlCommand("SELECT Name, Description, AccessTime, AssetType, Temporary, ID, AssetFlags, CreatorID 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["AssetType"];
+                            metadata.Temporary = Convert.ToBoolean(dbReader["Temporary"]); // Not sure if this is correct.
+                            metadata.Flags = (AssetFlags)Convert.ToInt32(dbReader["AssetFlags"]);
+                            metadata.FullID = DBGuid.FromDB(dbReader["ID"]);
+                            metadata.CreatorID = dbReader["CreatorID"].ToString();
+
+                            // We'll ignore this for now - it appears unused!
+//                                metadata.SHA1 = dbReader["hash"]);
+
+                            UpdateAccessTime(metadata, (int)dbReader["AccessTime"]);
+
+                            retList.Add(metadata);
+                        }
+                    }
+                }
+                catch (Exception e)
+                {
+                    m_log.Error("[XASSETS DB]: MySql failure fetching asset set" + Environment.NewLine + e.ToString());
+                }
+            }
+
+            return retList;
+        }
+
+        public bool Delete(string id)
+        {
+//            m_log.DebugFormat("[XASSETS DB]: Deleting asset {0}", id);
+
+            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