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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 System.Timers;
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_retryCounter;
private Dictionary<int, List<AssetBase>> m_retryQueue = new Dictionary<int, List<AssetBase>>();
private Timer m_retryTimer;
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>();
private Dictionary<string, List<AssetRetrievedEx>> m_AssetHandlers = new Dictionary<string, List<AssetRetrievedEx>>();
private Dictionary<string, string> m_UriMap = new Dictionary<string, string>();
public AssetServicesConnector()
{
}
public AssetServicesConnector(string serverURI)
{
m_ServerURI = serverURI.TrimEnd('/');
}
public AssetServicesConnector(IConfigSource source)
{
Initialise(source);
}
public virtual void Initialise(IConfigSource source)
{
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);
m_ServerURI = serviceURI;
if (serviceURI == String.Empty)
{
m_log.Error("[ASSET CONNECTOR]: No Server URI named in section AssetService");
throw new Exception("Asset connector init error");
}
m_retryTimer = new Timer();
m_retryTimer.Elapsed += new ElapsedEventHandler(retryCheck);
m_retryTimer.Interval = 60000;
Uri serverUri = new Uri(m_ServerURI);
string groupHost = serverUri.Host;
for (int i = 0 ; i < 256 ; i++)
{
string prefix = i.ToString("x2");
groupHost = assetConfig.GetString("AssetServerHost_"+prefix, groupHost);
m_UriMap[prefix] = groupHost;
//m_log.DebugFormat("[ASSET]: Using {0} for prefix {1}", groupHost, prefix);
}
}
private string MapServer(string id)
{
UriBuilder serverUri = new UriBuilder(m_ServerURI);
string prefix = id.Substring(0, 2).ToLower();
string host = m_UriMap[prefix];
serverUri.Host = host;
// m_log.DebugFormat("[ASSET]: Using {0} for host name for prefix {1}", host, prefix);
string ret = serverUri.Uri.AbsoluteUri;
if (ret.EndsWith("/"))
ret = ret.Substring(0, ret.Length - 1);
return serverUri.Uri.AbsoluteUri;
}
protected void retryCheck(object source, ElapsedEventArgs e)
{
m_retryCounter++;
if (m_retryCounter > 60) m_retryCounter -= 60;
List<int> keys = new List<int>();
foreach (int a in m_retryQueue.Keys)
{
keys.Add(a);
}
foreach (int a in keys)
{
//We exponentially fall back on frequency until we reach one attempt per hour
//The net result is that we end up in the queue for roughly 24 hours..
//24 hours worth of assets could be a lot, so the hope is that the region admin
//will have gotten the asset connector back online quickly!
int timefactor = a ^ 2;
if (timefactor > 60)
{
timefactor = 60;
}
//First, find out if we care about this timefactor
if (timefactor % a == 0)
{
//Yes, we do!
List<AssetBase> retrylist = m_retryQueue[a];
m_retryQueue.Remove(a);
foreach(AssetBase ass in retrylist)
{
Store(ass); //Store my ass. This function will put it back in the dictionary if it fails
}
}
}
if (m_retryQueue.Count == 0)
{
//It might only be one tick per minute, but I have
//repented and abandoned my wasteful ways
m_retryCounter = 0;
m_retryTimer.Stop();
}
}
protected void SetCache(IImprovedAssetCache cache)
{
m_Cache = cache;
}
public AssetBase Get(string id)
{
string uri = MapServer(id) + "/assets/" + id;
AssetBase asset = null;
if (m_Cache != null)
asset = m_Cache.Get(id);
if (asset == null || asset.Data == null || asset.Data.Length == 0)
{
asset = SynchronousRestObjectRequester.
MakeRequest<int, AssetBase>("GET", uri, 0);
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 = MapServer(id) + "/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(MapServer(id));
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)
{
string uri = MapServer(id) + "/assets/" + id;
AssetBase asset = null;
if (m_Cache != null)
asset = m_Cache.Get(id);
if (asset == null || asset.Data == null || asset.Data.Length == 0)
{
lock (m_AssetHandlers)
{
AssetRetrievedEx handlerEx = new AssetRetrievedEx(delegate(AssetBase _asset) { handler(id, sender, _asset); });
// AssetRetrievedEx handlers;
List<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;
handlers.Add(handlerEx);
return true;
}
// Load the asset ourselves
// handlers += handlerEx;
handlers = new List<AssetRetrievedEx>();
handlers.Add(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);
*/
List<AssetRetrievedEx> handlers;
lock (m_AssetHandlers)
{
handlers = m_AssetHandlers[id];
m_AssetHandlers.Remove(id);
}
foreach (AssetRetrievedEx h in handlers)
h.Invoke(a);
if (handlers != null)
handlers.Clear();
});
success = true;
}
finally
{
if (!success)
{
List<AssetRetrievedEx> handlers;
lock (m_AssetHandlers)
{
handlers = m_AssetHandlers[id];
m_AssetHandlers.Remove(id);
}
if (handlers != null)
handlers.Clear();
}
}
}
else
{
handler(id, sender, asset);
}
return true;
}
public string Store(AssetBase asset)
{
// Have to assign the asset ID here. This isn't likely to
// trigger since current callers don't pass emtpy IDs
// We need the asset ID to route the request to the proper
// cluster member, so we can't have the server assign one.
if (asset.ID == string.Empty)
{
if (asset.FullID == UUID.Zero)
{
asset.FullID = UUID.Random();
}
asset.ID = asset.FullID.ToString();
}
else if (asset.FullID == UUID.Zero)
{
UUID uuid = UUID.Zero;
if (UUID.TryParse(asset.ID, out uuid))
{
asset.FullID = uuid;
}
else
{
asset.FullID = UUID.Random();
}
}
if (m_Cache != null)
m_Cache.Cache(asset);
if (asset.Temporary || asset.Local)
{
return asset.ID;
}
string uri = MapServer(asset.FullID.ToString()) + "/assets/";
string newID = string.Empty;
try
{
newID = SynchronousRestObjectRequester.
MakeRequest<AssetBase, string>("POST", uri, asset, 25);
if (newID == null || newID == "")
{
newID = UUID.Zero.ToString();
}
}
catch (Exception e)
{
newID = UUID.Zero.ToString();
}
if (newID == UUID.Zero.ToString())
{
//The asset upload failed, put it in a queue for later
asset.UploadAttempts++;
if (asset.UploadAttempts > 30)
{
//By this stage we've been in the queue for a good few hours;
//We're going to drop the asset.
m_log.ErrorFormat("[Assets] Dropping asset {0} - Upload has been in the queue for too long.", asset.ID.ToString());
}
else
{
if (!m_retryQueue.ContainsKey(asset.UploadAttempts))
{
m_retryQueue.Add(asset.UploadAttempts, new List<AssetBase>());
}
List<AssetBase> m_queue = m_retryQueue[asset.UploadAttempts];
m_queue.Add(asset);
m_log.WarnFormat("[Assets] Upload failed: {0} - Requeuing asset for another run.", asset.ID.ToString());
m_retryTimer.Start();
}
}
else
{
if (asset.UploadAttempts > 0)
{
m_log.InfoFormat("[Assets] Upload of {0} succeeded after {1} failed attempts", asset.ID.ToString(), asset.UploadAttempts.ToString());
}
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 asset.ID;
}
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 = MapServer(id) + "/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 = MapServer(id) + "/assets/" + id;
if (SynchronousRestObjectRequester.
MakeRequest<int, bool>("DELETE", uri, 0))
{
if (m_Cache != null)
m_Cache.Expire(id);
return true;
}
return false;
}
}
}
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