opensim – Rev 1
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/*
* 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 OpenMetaverse;
using OpenSim.Framework;
using OpenSim.Data;
using Npgsql;
namespace OpenSim.Data.PGSQL
{
public class PGSQLXAssetData : 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 PGSQL storage plugin.</item>
/// <item>Warns and uses the obsolete pgsql_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("[PGSQL XASSETDATA]: ***********************************************************");
m_log.ErrorFormat("[PGSQL XASSETDATA]: ***********************************************************");
m_log.ErrorFormat("[PGSQL XASSETDATA]: ***********************************************************");
m_log.ErrorFormat("[PGSQL XASSETDATA]: THIS PLUGIN IS STRICTLY EXPERIMENTAL.");
m_log.ErrorFormat("[PGSQL XASSETDATA]: DO NOT USE FOR ANY DATA THAT YOU DO NOT MIND LOSING.");
m_log.ErrorFormat("[PGSQL XASSETDATA]: DATABASE TABLES CAN CHANGE AT ANY TIME, CAUSING EXISTING DATA TO BE LOST.");
m_log.ErrorFormat("[PGSQL XASSETDATA]: ***********************************************************");
m_log.ErrorFormat("[PGSQL XASSETDATA]: ***********************************************************");
m_log.ErrorFormat("[PGSQL XASSETDATA]: ***********************************************************");
m_connectionString = connect;
using (NpgsqlConnection dbcon = new NpgsqlConnection(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 "PGSQL 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("[PGSQL XASSET DATA]: Looking for asset {0}", assetID);
AssetBase asset = null;
lock (m_dbLock)
{
using (NpgsqlConnection dbcon = new NpgsqlConnection(m_connectionString))
{
dbcon.Open();
using (NpgsqlCommand cmd = new NpgsqlCommand(
@"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 (NpgsqlDataReader 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("[PGSQL 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);
lock (m_dbLock)
{
using (NpgsqlConnection dbcon = new NpgsqlConnection(m_connectionString))
{
dbcon.Open();
using (NpgsqlTransaction 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 (NpgsqlCommand cmd =
new NpgsqlCommand(
@"insert INTO XAssetsMeta(""ID"", ""Hash"", ""Name"", ""Description"", ""AssetType"", ""Local"", ""Temporary"", ""CreateTime"", ""AccessTime"", ""AssetFlags"", ""CreatorID"")
Select :ID, :Hash, :Name, :Description, :AssetType, :Local, :Temporary, :CreateTime, :AccessTime, :AssetFlags, :CreatorID
where not exists( Select ""ID"" from XAssetsMeta where ""ID"" = :ID ;
update XAssetsMeta
set ""ID"" = :ID, ""Hash"" = :Hash, ""Name"" = :Name, ""Description"" = :Description,
""AssetType"" = :AssetType, ""Local"" = :Local, ""Temporary"" = :Temporary, ""CreateTime"" = :CreateTime,
""AccessTime"" = :AccessTime, ""AssetFlags"" = :AssetFlags, ""CreatorID"" = :CreatorID
where ""ID"" = :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("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]: PGSQL 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 (NpgsqlCommand cmd =
new NpgsqlCommand(
@"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]: PGSQL 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 (NpgsqlConnection dbcon = new NpgsqlConnection(m_connectionString))
{
dbcon.Open();
NpgsqlCommand cmd =
new NpgsqlCommand(@"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 PGSQL DB]: Failure updating access_time for asset {0} with name {1} : {2}",
assetMetadata.ID, assetMetadata.Name, e.Message);
}
}
}
}
/// <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(NpgsqlConnection dbcon, NpgsqlTransaction transaction, byte[] hash)
{
// m_log.DebugFormat("[ASSETS DB]: Checking for asset {0}", uuid);
bool exists = false;
using (NpgsqlCommand cmd = new NpgsqlCommand(@"SELECT ""Hash"" FROM XAssetsData WHERE ""Hash""=:Hash", dbcon))
{
cmd.Parameters.AddWithValue("Hash", hash);
try
{
using (NpgsqlDataReader 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]: PGSql 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 (NpgsqlConnection dbcon = new NpgsqlConnection(m_connectionString))
{
dbcon.Open();
using (NpgsqlCommand cmd = new NpgsqlCommand(@"SELECT ""ID"" FROM XAssetsMeta WHERE ""ID""=:ID", dbcon))
{
cmd.Parameters.AddWithValue("ID", uuid.ToString());
try
{
using (NpgsqlDataReader 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]: PGSql 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 (NpgsqlConnection dbcon = new NpgsqlConnection(m_connectionString))
{
dbcon.Open();
NpgsqlCommand cmd = new NpgsqlCommand( @"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 (NpgsqlDataReader 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]: PGSql 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 (NpgsqlConnection dbcon = new NpgsqlConnection(m_connectionString))
{
dbcon.Open();
using (NpgsqlCommand cmd = new NpgsqlCommand(@"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
}
}