5 files changed, 344 insertions, 90 deletions

diff --git a/OpenSim/Data/IHGTravelingData.cs b/OpenSim/Data/IHGTravelingData.cs
new file mode 100644
index 0000000..dd89935
--- /dev/null
+++ b/OpenSim/Data/IHGTravelingData.cs
@@ -0,0 +1,58 @@
+/*
+ * 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 OpenMetaverse;
+using OpenSim.Framework;
+
+namespace OpenSim.Data
+{
+    // This MUST be a ref type!
+    public class HGTravelingData
+    {
+        public UUID SessionID;
+        public UUID UserID;
+        public Dictionary<string, string> Data;
+
+        public HGTravelingData()
+        {
+            Data = new Dictionary<string, string>();
+        }
+    }
+
+    /// <summary>
+    /// An interface for connecting to the user grid datastore
+    /// </summary>
+    public interface IHGTravelingData 
+    {
+        HGTravelingData Get(UUID sessionID);
+        HGTravelingData[] GetSessions(UUID userID);
+        bool Store(HGTravelingData data);
+        bool Delete(UUID sessionID);
+    }
+}
\ No newline at end of file
diff --git a/OpenSim/Data/MySQL/MySQLHGTravelData.cs b/OpenSim/Data/MySQL/MySQLHGTravelData.cs
new file mode 100644
index 0000000..1efbfc3
--- /dev/null
+++ b/OpenSim/Data/MySQL/MySQLHGTravelData.cs
@@ -0,0 +1,70 @@
+/*
+ * 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.Reflection;
+using System.Threading;
+using log4net;
+using OpenMetaverse;
+using OpenSim.Framework;
+using MySql.Data.MySqlClient;
+
+namespace OpenSim.Data.MySQL
+{
+    /// <summary>
+    /// A MySQL Interface for user grid data
+    /// </summary>
+    public class MySQLHGTravelData : MySQLGenericTableHandler<HGTravelingData>, IHGTravelingData
+    {
+//        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);
+
+        public MySQLHGTravelData(string connectionString, string realm) : base(connectionString, realm, "HGTravelStore") { }
+
+        public HGTravelingData Get(UUID sessionID)
+        {
+            HGTravelingData[] ret = Get("SessionID", sessionID.ToString());
+
+            if (ret.Length == 0)
+                return null;
+
+            return ret[0];
+        }
+
+        public HGTravelingData[] GetSessions(UUID userID)
+        {
+            return base.Get("UserID", userID.ToString());
+        }
+
+        public bool Delete(UUID sessionID)
+        {
+            return Delete("SessionID", sessionID.ToString());
+        }
+
+    }
+}
\ No newline at end of file
diff --git a/OpenSim/Data/MySQL/Resources/HGTravelStore.migrations b/OpenSim/Data/MySQL/Resources/HGTravelStore.migrations
new file mode 100644
index 0000000..a0c9ebe
--- /dev/null
+++ b/OpenSim/Data/MySQL/Resources/HGTravelStore.migrations
@@ -0,0 +1,17 @@
+:VERSION 1         # -------------------------- 
+
+BEGIN;
+
+CREATE TABLE `hg_traveling_data` (
+    `SessionID` VARCHAR(36) NOT NULL,
+    `UserID` VARCHAR(36) NOT NULL,
+        `GridExternalName` VARCHAR(255) NOT NULL DEFAULT '',
+        `ServiceToken` VARCHAR(255) NOT NULL DEFAULT '',
+        `ClientIPAddress` VARCHAR(16) NOT NULL DEFAULT '',
+        `MyIPAddress` VARCHAR(16) NOT NULL DEFAULT '',
+    PRIMARY KEY  (`SessionID`),
+        KEY (`UserID`)
+) ENGINE=InnoDB;
+
+COMMIT;
+
diff --git a/OpenSim/Services/HypergridService/UserAgentService.cs b/OpenSim/Services/HypergridService/UserAgentService.cs
index 733993f..b597cb9 100644
--- a/OpenSim/Services/HypergridService/UserAgentService.cs
+++ b/OpenSim/Services/HypergridService/UserAgentService.cs
@@ -30,6 +30,7 @@ using System.Collections.Generic;
 using System.Net;
 using System.Reflection;
 
+using OpenSim.Data;
 using OpenSim.Framework;
 using OpenSim.Services.Connectors.Friends;
 using OpenSim.Services.Connectors.Hypergrid;
@@ -50,14 +51,14 @@ namespace OpenSim.Services.HypergridService
     /// needs to do it for them.
     /// Once we have better clients, this shouldn't be needed.
     /// </summary>
-    public class UserAgentService : IUserAgentService
+    public class UserAgentService : UserAgentServiceBase, IUserAgentService
     {
         private static readonly ILog m_log =
                 LogManager.GetLogger(
                 MethodBase.GetCurrentMethod().DeclaringType);
 
         // This will need to go into a DB table
-        static Dictionary<UUID, TravelingAgentInfo> m_TravelingAgents = new Dictionary<UUID, TravelingAgentInfo>();
+        //static Dictionary<UUID, TravelingAgentInfo> m_Database = new Dictionary<UUID, TravelingAgentInfo>();
 
         static bool m_Initialized = false;
 
@@ -86,6 +87,7 @@ namespace OpenSim.Services.HypergridService
         }
 
         public UserAgentService(IConfigSource config, IFriendsSimConnector friendsConnector)
+            : base(config)
         {
             // Let's set this always, because we don't know the sequence
             // of instantiations
@@ -260,7 +262,8 @@ namespace OpenSim.Services.HypergridService
 
             // Generate a new service session
             agentCircuit.ServiceSessionID = region.ServerURI + ";" + UUID.Random();
-            TravelingAgentInfo old = UpdateTravelInfo(agentCircuit, region);
+            TravelingAgentInfo old = null;
+            TravelingAgentInfo travel = CreateTravelInfo(agentCircuit, region, fromLogin, out old);
             
             bool success = false;
             string myExternalIP = string.Empty;
@@ -282,23 +285,21 @@ namespace OpenSim.Services.HypergridService
                 m_log.DebugFormat("[USER AGENT SERVICE]: Unable to login user {0} {1} to grid {2}, reason: {3}", 
                     agentCircuit.firstname, agentCircuit.lastname, region.ServerURI, reason);
 
-                // restore the old travel info
-                lock (m_TravelingAgents)
-                {
-                    if (old == null)
-                        m_TravelingAgents.Remove(agentCircuit.SessionID);
-                    else
-                        m_TravelingAgents[agentCircuit.SessionID] = old;
-                }
+                if (old != null)
+                    StoreTravelInfo(old);
+                else
+                    m_Database.Delete(agentCircuit.SessionID);
 
                 return false;
             }
 
+            // Everything is ok
+
+            // Update the perceived IP Address of our grid 
             m_log.DebugFormat("[USER AGENT SERVICE]: Gatekeeper sees me as {0}", myExternalIP);
-            // else set the IP addresses associated with this client
-            if (fromLogin)
-                m_TravelingAgents[agentCircuit.SessionID].ClientIPAddress = agentCircuit.IPAddress;
-            m_TravelingAgents[agentCircuit.SessionID].MyIpAddress = myExternalIP;
+            travel.MyIpAddress = myExternalIP;
+
+            StoreTravelInfo(travel);
 
             return true;
         }
@@ -309,57 +310,39 @@ namespace OpenSim.Services.HypergridService
             return LoginAgentToGrid(agentCircuit, gatekeeper, finalDestination, false, out reason);
         }
 
-        private void SetClientIP(UUID sessionID, string ip)
+        TravelingAgentInfo CreateTravelInfo(AgentCircuitData agentCircuit, GridRegion region, bool fromLogin, out TravelingAgentInfo existing)
         {
-            if (m_TravelingAgents.ContainsKey(sessionID))
-            {
-                m_log.DebugFormat("[USER AGENT SERVICE]: Setting IP {0} for session {1}", ip, sessionID);
-                m_TravelingAgents[sessionID].ClientIPAddress = ip;
-            }
-        }
+            HGTravelingData hgt = m_Database.Get(agentCircuit.SessionID);
+            existing = null;
 
-        TravelingAgentInfo UpdateTravelInfo(AgentCircuitData agentCircuit, GridRegion region)
-        {
-            TravelingAgentInfo travel = new TravelingAgentInfo();
-            TravelingAgentInfo old = null;
-            lock (m_TravelingAgents)
+            if (hgt != null)
             {
-                if (m_TravelingAgents.ContainsKey(agentCircuit.SessionID))
-                {
-                    // Very important! Override whatever this agent comes with.
-                    // UserAgentService always sets the IP for every new agent
-                    // with the original IP address.
-                    agentCircuit.IPAddress = m_TravelingAgents[agentCircuit.SessionID].ClientIPAddress;
-
-                    old = m_TravelingAgents[agentCircuit.SessionID];
-                }
-
-                m_TravelingAgents[agentCircuit.SessionID] = travel;
+                // Very important! Override whatever this agent comes with.
+                // UserAgentService always sets the IP for every new agent
+                // with the original IP address.
+                existing = new TravelingAgentInfo(hgt);
+                agentCircuit.IPAddress = existing.ClientIPAddress;
             }
+
+            TravelingAgentInfo travel = new TravelingAgentInfo(existing);
+            travel.SessionID = agentCircuit.SessionID;
             travel.UserID = agentCircuit.AgentID;
             travel.GridExternalName = region.ServerURI;
             travel.ServiceToken = agentCircuit.ServiceSessionID;
-            if (old != null)
-                travel.ClientIPAddress = old.ClientIPAddress;
 
-            return old;
+            if (fromLogin)
+                travel.ClientIPAddress = agentCircuit.IPAddress;
+
+            StoreTravelInfo(travel);
+
+            return travel;
         }
 
         public void LogoutAgent(UUID userID, UUID sessionID)
         {
             m_log.DebugFormat("[USER AGENT SERVICE]: User {0} logged out", userID);
 
-            lock (m_TravelingAgents)
-            {
-                List<UUID> travels = new List<UUID>();
-                foreach (KeyValuePair<UUID, TravelingAgentInfo> kvp in m_TravelingAgents)
-                    if (kvp.Value == null) // do some clean up
-                        travels.Add(kvp.Key);
-                    else if (kvp.Value.UserID == userID)
-                        travels.Add(kvp.Key);
-                foreach (UUID session in travels)
-                    m_TravelingAgents.Remove(session);
-            }
+            m_Database.Delete(sessionID);
 
             GridUserInfo guinfo = m_GridUserService.GetGridUserInfo(userID.ToString());
             if (guinfo != null)
@@ -369,10 +352,11 @@ namespace OpenSim.Services.HypergridService
         // We need to prevent foreign users with the same UUID as a local user
         public bool IsAgentComingHome(UUID sessionID, string thisGridExternalName)
         {
-            if (!m_TravelingAgents.ContainsKey(sessionID))
+            HGTravelingData hgt = m_Database.Get(sessionID);
+            if (hgt == null)
                 return false;
 
-            TravelingAgentInfo travel = m_TravelingAgents[sessionID];
+            TravelingAgentInfo travel = new TravelingAgentInfo(hgt);
 
             return travel.GridExternalName.ToLower() == thisGridExternalName.ToLower();
         }
@@ -385,31 +369,32 @@ namespace OpenSim.Services.HypergridService
             m_log.DebugFormat("[USER AGENT SERVICE]: Verifying Client session {0} with reported IP {1}.", 
                 sessionID, reportedIP);
 
-            if (m_TravelingAgents.ContainsKey(sessionID))
-            {
-                bool result = m_TravelingAgents[sessionID].ClientIPAddress == reportedIP ||
-                    m_TravelingAgents[sessionID].MyIpAddress == reportedIP; // NATed
+            HGTravelingData hgt = m_Database.Get(sessionID);
+            if (hgt == null)
+                return false;
 
-                m_log.DebugFormat("[USER AGENT SERVICE]: Comparing {0} with login IP {1} and MyIP {1}; result is {3}",
-                                    reportedIP, m_TravelingAgents[sessionID].ClientIPAddress, m_TravelingAgents[sessionID].MyIpAddress, result);
+            TravelingAgentInfo travel = new TravelingAgentInfo(hgt);
 
-                return result;
-            }
+            bool result = travel.ClientIPAddress == reportedIP || travel.MyIpAddress == reportedIP; // NATed
 
-            return false;
+            m_log.DebugFormat("[USER AGENT SERVICE]: Comparing {0} with login IP {1} and MyIP {1}; result is {3}",
+                                reportedIP, travel.ClientIPAddress, travel.MyIpAddress, result);
+
+            return result;
         }
 
         public bool VerifyAgent(UUID sessionID, string token)
         {
-            if (m_TravelingAgents.ContainsKey(sessionID))
+            HGTravelingData hgt = m_Database.Get(sessionID);
+            if (hgt == null)
             {
-                m_log.DebugFormat("[USER AGENT SERVICE]: Verifying agent token {0} against {1}", token, m_TravelingAgents[sessionID].ServiceToken);
-                return m_TravelingAgents[sessionID].ServiceToken == token;
+                m_log.DebugFormat("[USER AGENT SERVICE]: Token verification for session {0}: no such session", sessionID);
+                return false;
             }
 
-            m_log.DebugFormat("[USER AGENT SERVICE]: Token verification for session {0}: no such session", sessionID);
-
-            return false;
+            TravelingAgentInfo travel = new TravelingAgentInfo(hgt);
+            m_log.DebugFormat("[USER AGENT SERVICE]: Verifying agent token {0} against {1}", token, travel.ServiceToken);
+            return travel.ServiceToken == token;
         }
 
         [Obsolete]
@@ -472,17 +457,17 @@ namespace OpenSim.Services.HypergridService
                 }
             }
 
-            // Lastly, let's notify the rest who may be online somewhere else
-            foreach (string user in usersToBeNotified)
-            {
-                UUID id = new UUID(user);
-                if (m_TravelingAgents.ContainsKey(id) && m_TravelingAgents[id].GridExternalName != m_GridName)
-                {
-                    string url = m_TravelingAgents[id].GridExternalName;
-                    // forward
-                    m_log.WarnFormat("[USER AGENT SERVICE]: User {0} is visiting {1}. HG Status notifications still not implemented.", user, url);
-                }
-            }
+            //// Lastly, let's notify the rest who may be online somewhere else
+            //foreach (string user in usersToBeNotified)
+            //{
+            //    UUID id = new UUID(user);
+            //    if (m_Database.ContainsKey(id) && m_Database[id].GridExternalName != m_GridName)
+            //    {
+            //        string url = m_Database[id].GridExternalName;
+            //        // forward
+            //        m_log.WarnFormat("[USER AGENT SERVICE]: User {0} is visiting {1}. HG Status notifications still not implemented.", user, url);
+            //    }
+            //}
 
             // and finally, let's send the online friends
             if (online)
@@ -609,16 +594,13 @@ namespace OpenSim.Services.HypergridService
 
         public string LocateUser(UUID userID)
         {
-            foreach (TravelingAgentInfo t in m_TravelingAgents.Values)
-            {
-                if (t == null)
-                {
-                    m_log.ErrorFormat("[USER AGENT SERVICE]: Oops! Null TravelingAgentInfo. Please report this on mantis");
-                    continue;
-                }
-                if (t.UserID == userID && !m_GridName.Equals(t.GridExternalName))
-                    return t.GridExternalName;
-            }
+            HGTravelingData[] hgts = m_Database.GetSessions(userID);
+            if (hgts == null)
+                return string.Empty;
+
+            foreach (HGTravelingData t in hgts)
+                if (t.Data.ContainsKey("GridExternalName") && !m_GridName.Equals(t.Data["GridExternalName"]))
+                    return t.Data["GridExternalName"];
 
             return string.Empty;
         }
@@ -689,17 +671,60 @@ namespace OpenSim.Services.HypergridService
             return exception;
         }
 
+        private void StoreTravelInfo(TravelingAgentInfo travel)
+        {
+            if (travel == null)
+                return;
+
+            HGTravelingData hgt = new HGTravelingData();
+            hgt.SessionID = travel.SessionID;
+            hgt.UserID = travel.UserID;
+            hgt.Data = new Dictionary<string, string>();
+            hgt.Data["GridExternalName"] = travel.GridExternalName;
+            hgt.Data["ServiceToken"] = travel.ServiceToken;
+            hgt.Data["ClientIPAddress"] = travel.ClientIPAddress;
+            hgt.Data["MyIPAddress"] = travel.MyIpAddress;
+
+            m_Database.Store(hgt);
+        }
         #endregion
 
     }
 
     class TravelingAgentInfo
     {
+        public UUID SessionID;
         public UUID UserID;
         public string GridExternalName = string.Empty;
         public string ServiceToken = string.Empty;
         public string ClientIPAddress = string.Empty; // as seen from this user agent service
         public string MyIpAddress = string.Empty; // the user agent service's external IP, as seen from the next gatekeeper
+
+        public TravelingAgentInfo(HGTravelingData t)
+        {
+            if (t.Data != null)
+            {
+                SessionID = new UUID(t.SessionID);
+                UserID = new UUID(t.UserID);
+                GridExternalName = t.Data["GridExternalName"];
+                ServiceToken = t.Data["ServiceToken"];
+                ClientIPAddress = t.Data["ClientIPAddress"];
+                MyIpAddress = t.Data["MyIPAddress"];
+            }
+        }
+
+        public TravelingAgentInfo(TravelingAgentInfo old)
+        {
+            if (old != null)
+            {
+                SessionID = old.SessionID;
+                UserID = old.UserID;
+                GridExternalName = old.GridExternalName;
+                ServiceToken = old.ServiceToken;
+                ClientIPAddress = old.ClientIPAddress;
+                MyIpAddress = old.MyIpAddress;
+            }
+        }
     }
 
 }
diff --git a/OpenSim/Services/HypergridService/UserAgentServiceBase.cs b/OpenSim/Services/HypergridService/UserAgentServiceBase.cs
new file mode 100644
index 0000000..a00e5a6
--- /dev/null
+++ b/OpenSim/Services/HypergridService/UserAgentServiceBase.cs
@@ -0,0 +1,84 @@
+/*
+ * 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.Reflection;
+using Nini.Config;
+using OpenSim.Framework;
+using OpenSim.Data;
+using OpenSim.Services.Interfaces;
+using OpenSim.Services.Base;
+
+namespace OpenSim.Services.HypergridService
+{
+    public class UserAgentServiceBase : ServiceBase
+    {
+        protected IHGTravelingData m_Database = null;
+
+        public UserAgentServiceBase(IConfigSource config)
+            : base(config)
+        {
+            string dllName = String.Empty;
+            string connString = String.Empty;
+            string realm = "hg_traveling_data";
+
+            //
+            // Try reading the [DatabaseService] section, if it exists
+            //
+            IConfig dbConfig = config.Configs["DatabaseService"];
+            if (dbConfig != null)
+            {
+                if (dllName == String.Empty)
+                    dllName = dbConfig.GetString("StorageProvider", String.Empty);
+                if (connString == String.Empty)
+                    connString = dbConfig.GetString("ConnectionString", String.Empty);
+            }
+
+            //
+            // [UserAgentService] section overrides [DatabaseService], if it exists
+            //
+            IConfig gridConfig = config.Configs["UserAgentService"];
+            if (gridConfig != null)
+            {
+                dllName = gridConfig.GetString("StorageProvider", dllName);
+                connString = gridConfig.GetString("ConnectionString", connString);
+                realm = gridConfig.GetString("Realm", realm);
+            }
+
+            //
+            // We tried, but this doesn't exist. We can't proceed.
+            //
+            if (dllName.Equals(String.Empty))
+                throw new Exception("No StorageProvider configured");
+
+            m_Database = LoadPlugin<IHGTravelingData>(dllName, new Object[] { connString, realm });
+            if (m_Database == null)
+                throw new Exception("Could not find a storage interface in the given module");
+
+        }
+    }
+}