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 log4net;
using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;
using Nini.Config;
using OpenSim.Framework;
using OpenSim.Framework.Console;
using OpenSim.Framework.Communications;
using OpenSim.Services.Interfaces;
using OpenMetaverse;
namespace OpenSim.Services.Connectors
{
public class AssetServicesConnector : IAssetService
{
private static readonly ILog m_log =
LogManager.GetLogger(
MethodBase.GetCurrentMethod().DeclaringType);
private string m_ServerURI = String.Empty;
private IImprovedAssetCache m_Cache = null;
private int m_maxAssetRequestConcurrency = 30;
private delegate void AssetRetrievedEx(AssetBase asset);
// Keeps track of concurrent requests for the same asset, so that it's only loaded once.
// Maps: Asset ID -> Handlers which will be called when the asset has been loaded
private Dictionary<string, AssetRetrievedEx> m_AssetHandlers = new Dictionary<string, AssetRetrievedEx>();
public int MaxAssetRequestConcurrency
{
get { return m_maxAssetRequestConcurrency; }
set { m_maxAssetRequestConcurrency = value; }
}
public AssetServicesConnector()
{
}
public AssetServicesConnector(string serverURI)
{
m_ServerURI = serverURI.TrimEnd('/');
}
public AssetServicesConnector(IConfigSource source)
{
Initialise(source);
}
public virtual void Initialise(IConfigSource source)
{
IConfig netconfig = source.Configs["Network"];
if (netconfig != null)
m_maxAssetRequestConcurrency = netconfig.GetInt("MaxRequestConcurrency",m_maxAssetRequestConcurrency);
IConfig assetConfig = source.Configs["AssetService"];
if (assetConfig == null)
{
m_log.Error("[ASSET CONNECTOR]: AssetService missing from OpenSim.ini");
throw new Exception("Asset connector init error");
}
string serviceURI = assetConfig.GetString("AssetServerURI",
String.Empty);
if (serviceURI == String.Empty)
{
m_log.Error("[ASSET CONNECTOR]: No Server URI named in section AssetService");
throw new Exception("Asset connector init error");
}
m_ServerURI = serviceURI;
}
protected void SetCache(IImprovedAssetCache cache)
{
m_Cache = cache;
}
public AssetBase Get(string id)
{
// m_log.DebugFormat("[ASSET SERVICE CONNECTOR]: Synchronous get request for {0}", id);
string uri = m_ServerURI + "/assets/" + id;
AssetBase asset = null;
if (m_Cache != null)
asset = m_Cache.Get(id);
if (asset == null)
{
asset = SynchronousRestObjectRequester.
MakeRequest<int, AssetBase>("GET", uri, 0, m_maxAssetRequestConcurrency);
if (m_Cache != null)
m_Cache.Cache(asset);
}
return asset;
}
public AssetBase GetCached(string id)
{
// m_log.DebugFormat("[ASSET SERVICE CONNECTOR]: Cache request for {0}", id);
if (m_Cache != null)
return m_Cache.Get(id);
return null;
}
public AssetMetadata GetMetadata(string id)
{
if (m_Cache != null)
{
AssetBase fullAsset = m_Cache.Get(id);
if (fullAsset != null)
return fullAsset.Metadata;
}
string uri = m_ServerURI + "/assets/" + id + "/metadata";
AssetMetadata asset = SynchronousRestObjectRequester.
MakeRequest<int, AssetMetadata>("GET", uri, 0);
return asset;
}
public byte[] GetData(string id)
{
if (m_Cache != null)
{
AssetBase fullAsset = m_Cache.Get(id);
if (fullAsset != null)
return fullAsset.Data;
}
RestClient rc = new RestClient(m_ServerURI);
rc.AddResourcePath("assets");
rc.AddResourcePath(id);
rc.AddResourcePath("data");
rc.RequestMethod = "GET";
Stream s = rc.Request();
if (s == null)
return null;
if (s.Length > 0)
{
byte[] ret = new byte[s.Length];
s.Read(ret, 0, (int)s.Length);
return ret;
}
return null;
}
public bool Get(string id, Object sender, AssetRetrieved handler)
{
// m_log.DebugFormat("[ASSET SERVICE CONNECTOR]: Potentially asynchronous get request for {0}", id);
string uri = m_ServerURI + "/assets/" + id;
AssetBase asset = null;
if (m_Cache != null)
asset = m_Cache.Get(id);
if (asset == null)
{
lock (m_AssetHandlers)
{
AssetRetrievedEx handlerEx = new AssetRetrievedEx(delegate(AssetBase _asset) { handler(id, sender, _asset); });
AssetRetrievedEx handlers;
if (m_AssetHandlers.TryGetValue(id, out handlers))
{
// Someone else is already loading this asset. It will notify our handler when done.
handlers += handlerEx;
return true;
}
// Load the asset ourselves
handlers += handlerEx;
m_AssetHandlers.Add(id, handlers);
}
bool success = false;
try
{
AsynchronousRestObjectRequester.MakeRequest<int, AssetBase>("GET", uri, 0,
delegate(AssetBase a)
{
if (m_Cache != null)
m_Cache.Cache(a);
AssetRetrievedEx handlers;
lock (m_AssetHandlers)
{
handlers = m_AssetHandlers[id];
m_AssetHandlers.Remove(id);
}
handlers.Invoke(a);
}, m_maxAssetRequestConcurrency);
success = true;
}
finally
{
if (!success)
{
lock (m_AssetHandlers)
{
m_AssetHandlers.Remove(id);
}
}
}
}
else
{
handler(id, sender, asset);
}
return true;
}
public string Store(AssetBase asset)
{
if (asset.Local)
{
if (m_Cache != null)
m_Cache.Cache(asset);
return asset.ID;
}
string uri = m_ServerURI + "/assets/";
string newID = string.Empty;
try
{
newID = SynchronousRestObjectRequester.
MakeRequest<AssetBase, string>("POST", uri, asset);
}
catch (Exception e)
{
m_log.WarnFormat("[ASSET CONNECTOR]: Unable to send asset {0} to asset server. Reason: {1}", asset.ID, e.Message);
}
if (newID != String.Empty)
{
// Placing this here, so that this work with old asset servers that don't send any reply back
// SynchronousRestObjectRequester returns somethins that is not an empty string
if (newID != null)
asset.ID = newID;
if (m_Cache != null)
m_Cache.Cache(asset);
}
return newID;
}
public bool UpdateContent(string id, byte[] data)
{
AssetBase asset = null;
if (m_Cache != null)
asset = m_Cache.Get(id);
if (asset == null)
{
AssetMetadata metadata = GetMetadata(id);
if (metadata == null)
return false;
asset = new AssetBase(metadata.FullID, metadata.Name, metadata.Type, UUID.Zero.ToString());
asset.Metadata = metadata;
}
asset.Data = data;
string uri = m_ServerURI + "/assets/" + id;
if (SynchronousRestObjectRequester.
MakeRequest<AssetBase, bool>("POST", uri, asset))
{
if (m_Cache != null)
m_Cache.Cache(asset);
return true;
}
return false;
}
public bool Delete(string id)
{
string uri = m_ServerURI + "/assets/" + id;
if (SynchronousRestObjectRequester.
MakeRequest<int, bool>("DELETE", uri, 0))
{
if (m_Cache != null)
m_Cache.Expire(id);
return true;
}
return false;
}
}
}