opensim-development – 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.IO;
using System.Reflection;
using System.Text;
using System.Text.RegularExpressions;
using System.Xml;
using log4net;
using OpenSim.Region.DataSnapshot.Interfaces;
using OpenSim.Region.Framework.Scenes;
namespace OpenSim.Region.DataSnapshot
{
public class SnapshotStore
{
#region Class Members
private String m_directory = "unyuu"; //not an attempt at adding RM references to core SVN, honest
private Dictionary<Scene, bool> m_scenes = null;
private List<IDataSnapshotProvider> m_providers = null;
private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
private Dictionary<String, String> m_gridinfo = null;
private bool m_cacheEnabled = true;
private string m_listener_port = "9000"; //TODO: Set default port over 9000
private string m_hostname = "127.0.0.1";
#endregion
public SnapshotStore(string directory, Dictionary<String, String> gridinfo, string port, string hostname) {
m_directory = directory;
m_scenes = new Dictionary<Scene, bool>();
m_providers = new List<IDataSnapshotProvider>();
m_gridinfo = gridinfo;
m_listener_port = port;
m_hostname = hostname;
if (Directory.Exists(m_directory))
{
m_log.Info("[DATASNAPSHOT]: Response and fragment cache directory already exists.");
}
else
{
// Try to create the directory.
m_log.Info("[DATASNAPSHOT]: Creating directory " + m_directory);
try
{
Directory.CreateDirectory(m_directory);
}
catch (Exception e)
{
m_log.Error("[DATASNAPSHOT]: Failed to create directory " + m_directory, e);
//This isn't a horrible problem, just disable cacheing.
m_cacheEnabled = false;
m_log.Error("[DATASNAPSHOT]: Could not create directory, response cache has been disabled.");
}
}
}
public void ForceSceneStale(Scene scene) {
m_scenes[scene] = true;
}
#region Fragment storage
public XmlNode GetFragment(IDataSnapshotProvider provider, XmlDocument factory)
{
XmlNode data = null;
if (provider.Stale || !m_cacheEnabled)
{
data = provider.RequestSnapshotData(factory);
if (m_cacheEnabled)
{
String path = DataFileNameFragment(provider.GetParentScene, provider.Name);
try
{
using (XmlTextWriter snapXWriter = new XmlTextWriter(path, Encoding.Default))
{
snapXWriter.Formatting = Formatting.Indented;
snapXWriter.WriteStartDocument();
data.WriteTo(snapXWriter);
snapXWriter.WriteEndDocument();
}
}
catch (Exception e)
{
m_log.WarnFormat("[DATASNAPSHOT]: Exception on writing to file {0}: {1}", path, e.Message);
}
}
//mark provider as not stale, parent scene as stale
provider.Stale = false;
m_scenes[provider.GetParentScene] = true;
m_log.Debug("[DATASNAPSHOT]: Generated fragment response for provider type " + provider.Name);
}
else
{
String path = DataFileNameFragment(provider.GetParentScene, provider.Name);
XmlDocument fragDocument = new XmlDocument();
fragDocument.PreserveWhitespace = true;
fragDocument.Load(path);
foreach (XmlNode node in fragDocument)
{
data = factory.ImportNode(node, true);
}
m_log.Debug("[DATASNAPSHOT]: Retrieved fragment response for provider type " + provider.Name);
}
return data;
}
#endregion
#region Response storage
public XmlNode GetScene(Scene scene, XmlDocument factory)
{
m_log.Debug("[DATASNAPSHOT]: Data requested for scene " + scene.RegionInfo.RegionName);
if (!m_scenes.ContainsKey(scene)) {
m_scenes.Add(scene, true); //stale by default
}
XmlNode regionElement = null;
if (!m_scenes[scene])
{
m_log.Debug("[DATASNAPSHOT]: Attempting to retrieve snapshot from cache.");
//get snapshot from cache
String path = DataFileNameScene(scene);
XmlDocument fragDocument = new XmlDocument();
fragDocument.PreserveWhitespace = true;
fragDocument.Load(path);
foreach (XmlNode node in fragDocument)
{
regionElement = factory.ImportNode(node, true);
}
m_log.Debug("[DATASNAPSHOT]: Obtained snapshot from cache for " + scene.RegionInfo.RegionName);
}
else
{
m_log.Debug("[DATASNAPSHOT]: Attempting to generate snapshot.");
//make snapshot
regionElement = MakeRegionNode(scene, factory);
regionElement.AppendChild(GetGridSnapshotData(factory));
XmlNode regionData = factory.CreateNode(XmlNodeType.Element, "data", "");
foreach (IDataSnapshotProvider dataprovider in m_providers)
{
if (dataprovider.GetParentScene == scene)
{
regionData.AppendChild(GetFragment(dataprovider, factory));
}
}
regionElement.AppendChild(regionData);
factory.AppendChild(regionElement);
//save snapshot
String path = DataFileNameScene(scene);
try
{
using (XmlTextWriter snapXWriter = new XmlTextWriter(path, Encoding.Default))
{
snapXWriter.Formatting = Formatting.Indented;
snapXWriter.WriteStartDocument();
regionElement.WriteTo(snapXWriter);
snapXWriter.WriteEndDocument();
}
}
catch (Exception e)
{
m_log.WarnFormat("[DATASNAPSHOT]: Exception on writing to file {0}: {1}", path, e.Message);
}
m_scenes[scene] = false;
m_log.Debug("[DATASNAPSHOT]: Generated new snapshot for " + scene.RegionInfo.RegionName);
}
return regionElement;
}
#endregion
#region Helpers
private string DataFileNameFragment(Scene scene, String fragmentName)
{
return Path.Combine(m_directory, Path.ChangeExtension(Sanitize(scene.RegionInfo.RegionName + "_" + fragmentName), "xml"));
}
private string DataFileNameScene(Scene scene)
{
return Path.Combine(m_directory, Path.ChangeExtension(Sanitize(scene.RegionInfo.RegionName), "xml"));
//return (m_snapsDir + Path.DirectorySeparatorChar + scene.RegionInfo.RegionName + ".xml");
}
private static string Sanitize(string name)
{
string invalidChars = Regex.Escape(new string(Path.GetInvalidFileNameChars()));
string invalidReStr = string.Format(@"[{0}]", invalidChars);
string newname = Regex.Replace(name, invalidReStr, "_");
return newname.Replace('.', '_');
}
private XmlNode MakeRegionNode(Scene scene, XmlDocument basedoc)
{
XmlNode docElement = basedoc.CreateNode(XmlNodeType.Element, "region", "");
XmlAttribute attr = basedoc.CreateAttribute("category");
attr.Value = GetRegionCategory(scene);
docElement.Attributes.Append(attr);
attr = basedoc.CreateAttribute("entities");
attr.Value = scene.Entities.Count.ToString();
docElement.Attributes.Append(attr);
//attr = basedoc.CreateAttribute("parcels");
//attr.Value = scene.LandManager.landList.Count.ToString();
//docElement.Attributes.Append(attr);
XmlNode infoblock = basedoc.CreateNode(XmlNodeType.Element, "info", "");
XmlNode infopiece = basedoc.CreateNode(XmlNodeType.Element, "uuid", "");
infopiece.InnerText = scene.RegionInfo.RegionID.ToString();
infoblock.AppendChild(infopiece);
infopiece = basedoc.CreateNode(XmlNodeType.Element, "url", "");
infopiece.InnerText = "http://" + m_hostname + ":" + m_listener_port;
infoblock.AppendChild(infopiece);
infopiece = basedoc.CreateNode(XmlNodeType.Element, "name", "");
infopiece.InnerText = scene.RegionInfo.RegionName;
infoblock.AppendChild(infopiece);
infopiece = basedoc.CreateNode(XmlNodeType.Element, "handle", "");
infopiece.InnerText = scene.RegionInfo.RegionHandle.ToString();
infoblock.AppendChild(infopiece);
docElement.AppendChild(infoblock);
m_log.Debug("[DATASNAPSHOT]: Generated region node");
return docElement;
}
private String GetRegionCategory(Scene scene)
{
if (scene.RegionInfo.RegionSettings.Maturity == 0)
return "PG";
if (scene.RegionInfo.RegionSettings.Maturity == 1)
return "Mature";
if (scene.RegionInfo.RegionSettings.Maturity == 2)
return "Adult";
return "Unknown";
}
private XmlNode GetGridSnapshotData(XmlDocument factory)
{
XmlNode griddata = factory.CreateNode(XmlNodeType.Element, "grid", "");
foreach (KeyValuePair<String, String> GridData in m_gridinfo)
{
//TODO: make it lowercase tag names for diva
XmlNode childnode = factory.CreateNode(XmlNodeType.Element, GridData.Key, "");
childnode.InnerText = GridData.Value;
griddata.AppendChild(childnode);
}
m_log.Debug("[DATASNAPSHOT]: Got grid snapshot data");
return griddata;
}
#endregion
#region Manage internal collections
public void AddScene(Scene newScene)
{
m_scenes.Add(newScene, true);
}
public void RemoveScene(Scene deadScene)
{
m_scenes.Remove(deadScene);
}
public void AddProvider(IDataSnapshotProvider newProvider)
{
m_providers.Add(newProvider);
}
public void RemoveProvider(IDataSnapshotProvider deadProvider)
{
m_providers.Remove(deadProvider);
}
#endregion
}
}