/* * 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; 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 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; lock (m_dbLock) { 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) { 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.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 > 64) { assetDescription = asset.Description.Substring(0, 64); 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; lock (m_dbLock) { 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 e) { 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 asset exists in the database /// </summary> /// <param name="uuid">The asset UUID</param> /// <returns>true if it exists, false otherwise.</returns> 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.Error(string.Format("[XASSETS DB]: MySql failure fetching asset {0}", uuid), e); } } } } 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 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, 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); 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 } }