1 files changed, 487 insertions, 0 deletions

diff --git a/OpenSim/Services/Connectors/Asset/AssetServicesConnector.cs b/OpenSim/Services/Connectors/Asset/AssetServicesConnector.cs
new file mode 100644
index 0000000..45ebf3a
--- /dev/null
+++ b/OpenSim/Services/Connectors/Asset/AssetServicesConnector.cs
@@ -0,0 +1,487 @@
+/*
+ * 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);
+
+            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;
+        }
+    }
+}