/*
 * 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 OpenSim 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;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Reflection;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Channels;
using System.Runtime.Remoting.Channels.Tcp;
using System.Security.Authentication;
using System.Threading;
using libsecondlife;
using log4net;
using Nwc.XmlRpc;
using OpenSim.Framework;
using OpenSim.Framework.Communications;
using OpenSim.Framework.Servers;
using OpenSim.Region.Communications.Local;

namespace OpenSim.Region.Communications.OGS1
{
    public class OGS1GridServices : IGridServices, IInterRegionCommunications
    {
        private static readonly ILog m_log = LogManager.GetLogger(MethodBase.GetCurrentMethod().DeclaringType);

        private LocalBackEndServices m_localBackend = new LocalBackEndServices();
        private Dictionary<ulong, RegionInfo> m_remoteRegionInfoCache = new Dictionary<ulong, RegionInfo>();
        // private List<SimpleRegionInfo> m_knownRegions = new List<SimpleRegionInfo>();
        private Dictionary<ulong, int> m_deadRegionCache = new Dictionary<ulong, int>();
        private Dictionary<string, string> m_queuedGridSettings = new Dictionary<string, string>();
        private List<RegionInfo> m_regionsOnInstance = new List<RegionInfo>();



        public BaseHttpServer httpListener;
        public NetworkServersInfo serversInfo;
        public BaseHttpServer httpServer;

        public string _gdebugRegionName = String.Empty;

        public string gdebugRegionName
        {
            get { return _gdebugRegionName; }
            set { _gdebugRegionName = value; }
        }

        public string _rdebugRegionName = String.Empty;

        public string rdebugRegionName
        {
            get { return _rdebugRegionName; }
            set { _rdebugRegionName = value; }
        }

        /// <summary>
        /// Contructor.  Adds "expect_user" and "check" xmlrpc method handlers
        /// </summary>
        /// <param name="servers_info"></param>
        /// <param name="httpServe"></param>
        public OGS1GridServices(NetworkServersInfo servers_info, BaseHttpServer httpServe)
        {
            serversInfo = servers_info;
            httpServer = httpServe;
            //Respond to Grid Services requests
            httpServer.AddXmlRPCHandler("expect_user", ExpectUser);
            httpServer.AddXmlRPCHandler("logoff_user", LogOffUser);
            httpServer.AddXmlRPCHandler("check", PingCheckReply);

            StartRemoting();
        }

        // see IGridServices
        public RegionCommsListener RegisterRegion(RegionInfo regionInfo)
        {
            m_regionsOnInstance.Add(regionInfo);

            m_log.InfoFormat(
                "[OGS1 GRID SERVICES]: Attempting to register region {0} with grid at {1}",
                regionInfo.RegionName, serversInfo.GridURL);

            Hashtable GridParams = new Hashtable();
            // Login / Authentication

            GridParams["authkey"] = serversInfo.GridSendKey;
            GridParams["recvkey"] = serversInfo.GridRecvKey;
            GridParams["UUID"] = regionInfo.RegionID.ToString();
            GridParams["sim_ip"] = regionInfo.ExternalHostName;
            GridParams["sim_port"] = regionInfo.InternalEndPoint.Port.ToString();
            GridParams["region_locx"] = regionInfo.RegionLocX.ToString();
            GridParams["region_locy"] = regionInfo.RegionLocY.ToString();
            GridParams["sim_name"] = regionInfo.RegionName;
            GridParams["http_port"] = serversInfo.HttpListenerPort.ToString();
            GridParams["remoting_port"] = NetworkServersInfo.RemotingListenerPort.ToString();
            GridParams["map-image-id"] = regionInfo.RegionSettings.TerrainImageID.ToString();
            GridParams["originUUID"] = regionInfo.originRegionID.ToString();
            GridParams["server_uri"] = regionInfo.ServerURI;
            GridParams["region_secret"] = regionInfo.regionSecret;

            // part of an initial brutish effort to provide accurate information (as per the xml region spec)
            // wrt the ownership of a given region
            // the (very bad) assumption is that this value is being read and handled inconsistently or
            // not at all. Current strategy is to put the code in place to support the validity of this information
            // and to roll forward debugging any issues from that point
            //
            // this particular section of the mod attempts to supply a value from the region's xml file to the grid
            // server for the UUID of the region's owner (master avatar)
            GridParams["master_avatar_uuid"] = regionInfo.MasterAvatarAssignedUUID.ToString();

            // Package into an XMLRPC Request
            ArrayList SendParams = new ArrayList();
            SendParams.Add(GridParams);

            // Send Request
            XmlRpcResponse GridResp;
            try
            {
                XmlRpcRequest GridReq = new XmlRpcRequest("simulator_login", SendParams);
                
                // The timeout should always be significantly larger than the timeout for the grid server to request
                // the initial status of the region before confirming registration.
                GridResp = GridReq.Send(serversInfo.GridURL, 90000);
            }
            catch (Exception e)
            {
                Exception e2
                    = new Exception(
                        String.Format("Unable to connect to grid at {0}. Grid service not running?", serversInfo.GridURL),
                        e);

                throw(e2);
            }

            Hashtable GridRespData = (Hashtable)GridResp.Value;
            // Hashtable griddatahash = GridRespData;

            // Process Response
            if (GridRespData.ContainsKey("error"))
            {
                string errorstring = (string) GridRespData["error"];

                Exception e = new Exception(String.Format("Unable to connect to grid at {0}: {1}", serversInfo.GridURL, errorstring));

                throw e;
            }
            else
            {
                // m_knownRegions = RequestNeighbours(regionInfo.RegionLocX, regionInfo.RegionLocY);
                if (GridRespData.ContainsKey("allow_forceful_banlines"))
                {
                    if ((string) GridRespData["allow_forceful_banlines"] != "TRUE")
                    {
                        //m_localBackend.SetForcefulBanlistsDisallowed(regionInfo.RegionHandle);
                        m_queuedGridSettings.Add("allow_forceful_banlines", "FALSE");
                    }
                }

                m_log.InfoFormat(
                    "[OGS1 GRID SERVICES]: Region {0} successfully registered with grid at {1}",
                    regionInfo.RegionName, serversInfo.GridURL);
            }
            return m_localBackend.RegisterRegion(regionInfo);
        }

        public bool DeregisterRegion(RegionInfo regionInfo)
        {
            Hashtable GridParams = new Hashtable();

            GridParams["UUID"] = regionInfo.RegionID.ToString();

            // Package into an XMLRPC Request
            ArrayList SendParams = new ArrayList();
            SendParams.Add(GridParams);

            // Send Request
            XmlRpcRequest GridReq = new XmlRpcRequest("simulator_after_region_moved", SendParams);
            XmlRpcResponse GridResp = GridReq.Send(serversInfo.GridURL, 10000);
            Hashtable GridRespData = (Hashtable) GridResp.Value;

            // Hashtable griddatahash = GridRespData;

            // Process Response
            if (GridRespData != null && GridRespData.ContainsKey("error"))
            {
                string errorstring = (string)GridRespData["error"];
                m_log.Error("Unable to connect to grid: " + errorstring);
                return false;
            }

            // What does DeregisterRegion() do?
            return m_localBackend.DeregisterRegion(regionInfo);
        }

        public virtual Dictionary<string, string> GetGridSettings()
        {
            Dictionary<string, string> returnGridSettings = new Dictionary<string, string>();
            lock (m_queuedGridSettings)
            {
                foreach (string Dictkey in m_queuedGridSettings.Keys)
                {
                    returnGridSettings.Add(Dictkey, m_queuedGridSettings[Dictkey]);
                }

                m_queuedGridSettings.Clear();
            }

            return returnGridSettings;
        }

        // see IGridServices
        public List<SimpleRegionInfo> RequestNeighbours(uint x, uint y)
        {
            Hashtable respData = MapBlockQuery((int) x - 1, (int) y - 1, (int) x + 1, (int) y + 1);

            List<SimpleRegionInfo> neighbours = new List<SimpleRegionInfo>();

            foreach (ArrayList neighboursList in respData.Values)
            {
                foreach (Hashtable neighbourData in neighboursList)
                {
                    uint regX = Convert.ToUInt32(neighbourData["x"]);
                    uint regY = Convert.ToUInt32(neighbourData["y"]);
                    if ((x != regX) || (y != regY))
                    {
                        string simIp = (string) neighbourData["sim_ip"];

                        uint port = Convert.ToUInt32(neighbourData["sim_port"]);
                        // string externalUri = (string) neighbourData["sim_uri"];

                        // string externalIpStr = String.Empty;
                        try
                        {
                            // externalIpStr = Util.GetHostFromDNS(simIp).ToString();
                            Util.GetHostFromDNS(simIp).ToString();
                        }
                        catch (SocketException e)
                        {
                            m_log.WarnFormat("RequestNeighbours(): Lookup of neighbour {0} failed!  Not including in neighbours list.  {1}", simIp, e);
                            continue;
                        }

                        SimpleRegionInfo sri = new SimpleRegionInfo(regX, regY, simIp, port);

                        sri.RemotingPort = Convert.ToUInt32(neighbourData["remoting_port"]);

                        if (neighbourData.ContainsKey("http_port"))
                        {
                            sri.HttpPort = Convert.ToUInt32(neighbourData["http_port"]);
                        }

                        sri.RegionID = new LLUUID((string) neighbourData["uuid"]);

                        neighbours.Add(sri);
                    }
                }
            }

            return neighbours;
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="regionHandle"></param>
        /// <returns></returns>
        public RegionInfo RequestNeighbourInfo(LLUUID Region_UUID)
        {
            RegionInfo regionInfo;
            Hashtable requestData = new Hashtable();
            requestData["region_UUID"] = Region_UUID.ToString();
            requestData["authkey"] = serversInfo.GridSendKey;
            ArrayList SendParams = new ArrayList();
            SendParams.Add(requestData);
            XmlRpcRequest GridReq = new XmlRpcRequest("simulator_data_request", SendParams);
            XmlRpcResponse GridResp = GridReq.Send(serversInfo.GridURL, 3000);

            Hashtable responseData = (Hashtable) GridResp.Value;

            if (responseData.ContainsKey("error"))
            {
                m_log.WarnFormat("[OGS1 GRID SERVICES]: Error received from grid server: {0}", responseData["error"]);
                return null;
            }

            uint regX = Convert.ToUInt32((string) responseData["region_locx"]);
            uint regY = Convert.ToUInt32((string) responseData["region_locy"]);
            string internalIpStr = (string) responseData["sim_ip"];
            uint port = Convert.ToUInt32(responseData["sim_port"]);
            // string externalUri = (string) responseData["sim_uri"];

            IPEndPoint neighbourInternalEndPoint = new IPEndPoint(IPAddress.Parse(internalIpStr), (int) port);
            // string neighbourExternalUri = externalUri;
            regionInfo = new RegionInfo(regX, regY, neighbourInternalEndPoint, internalIpStr);

            regionInfo.RemotingPort = Convert.ToUInt32((string) responseData["remoting_port"]);
            regionInfo.RemotingAddress = internalIpStr;

            if (responseData.ContainsKey("http_port"))
            {
                regionInfo.HttpPort = Convert.ToUInt32((string) responseData["http_port"]);
            }

            regionInfo.RegionID = new LLUUID((string) responseData["region_UUID"]);
            regionInfo.RegionName = (string) responseData["region_name"];

            if (requestData.ContainsKey("regionHandle"))
            {
                m_remoteRegionInfoCache.Add(Convert.ToUInt64((string) requestData["regionHandle"]), regionInfo);
            }

            return regionInfo;
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="regionHandle"></param>
        /// <returns></returns>
        public RegionInfo RequestNeighbourInfo(ulong regionHandle)
        {
            RegionInfo regionInfo = m_localBackend.RequestNeighbourInfo(regionHandle);

            if (regionInfo != null)
            {
                return regionInfo;
            }

            if (!m_remoteRegionInfoCache.TryGetValue(regionHandle, out regionInfo))
            {
                try
                {
                    Hashtable requestData = new Hashtable();
                    requestData["region_handle"] = regionHandle.ToString();
                    requestData["authkey"] = serversInfo.GridSendKey;
                    ArrayList SendParams = new ArrayList();
                    SendParams.Add(requestData);
                    XmlRpcRequest GridReq = new XmlRpcRequest("simulator_data_request", SendParams);
                    XmlRpcResponse GridResp = GridReq.Send(serversInfo.GridURL, 3000);

                    Hashtable responseData = (Hashtable) GridResp.Value;

                    if (responseData.ContainsKey("error"))
                    {
                        m_log.Error("[OGS1 GRID SERVICES]: Error received from grid server: " + responseData["error"]);
                        return null;
                    }

                    uint regX = Convert.ToUInt32((string) responseData["region_locx"]);
                    uint regY = Convert.ToUInt32((string) responseData["region_locy"]);
                    string internalIpStr = (string) responseData["sim_ip"];
                    uint port = Convert.ToUInt32(responseData["sim_port"]);
                    // string externalUri = (string) responseData["sim_uri"];

                    IPEndPoint neighbourInternalEndPoint = new IPEndPoint(IPAddress.Parse(internalIpStr), (int) port);
                    // string neighbourExternalUri = externalUri;
                    regionInfo = new RegionInfo(regX, regY, neighbourInternalEndPoint, internalIpStr);

                    regionInfo.RemotingPort = Convert.ToUInt32((string) responseData["remoting_port"]);
                    regionInfo.RemotingAddress = internalIpStr;

                    if (responseData.ContainsKey("http_port"))
                    {
                        regionInfo.HttpPort = Convert.ToUInt32((string) responseData["http_port"]);
                    }

                    regionInfo.RegionID = new LLUUID((string) responseData["region_UUID"]);
                    regionInfo.RegionName = (string) responseData["region_name"];

                    lock (m_remoteRegionInfoCache)
                    {
                        if (!m_remoteRegionInfoCache.ContainsKey(regionHandle))
                        {
                            m_remoteRegionInfoCache.Add(regionHandle, regionInfo);
                        }
                    }
                }
                catch (WebException)
                {
                    m_log.Error("[OGS1 GRID SERVICES]: " +
                                "Region lookup failed for: " + regionHandle.ToString() +
                                " - Is the GridServer down?");
                    return null;
                }
            }

            return regionInfo;
        }

        public RegionInfo RequestClosestRegion(string regionName)
        {
            foreach (RegionInfo ri in m_remoteRegionInfoCache.Values)
            {
                if (ri.RegionName == regionName)
                    return ri;
            }

            RegionInfo regionInfo = null;
            try
            {
                Hashtable requestData = new Hashtable();
                requestData["region_name_search"] = regionName;
                requestData["authkey"] = serversInfo.GridSendKey;
                ArrayList SendParams = new ArrayList();
                SendParams.Add(requestData);
                XmlRpcRequest GridReq = new XmlRpcRequest("simulator_data_request", SendParams);
                XmlRpcResponse GridResp = GridReq.Send(serversInfo.GridURL, 3000);

                Hashtable responseData = (Hashtable) GridResp.Value;

                if (responseData.ContainsKey("error"))
                {
                    m_log.Error("[OGS1 GRID SERVICES]: Error received from grid server" + responseData["error"]);
                    return null;
                }

                uint regX = Convert.ToUInt32((string) responseData["region_locx"]);
                uint regY = Convert.ToUInt32((string) responseData["region_locy"]);
                string internalIpStr = (string) responseData["sim_ip"];
                uint port = Convert.ToUInt32(responseData["sim_port"]);
                // string externalUri = (string) responseData["sim_uri"];

                IPEndPoint neighbourInternalEndPoint = new IPEndPoint(IPAddress.Parse(internalIpStr), (int) port);
                // string neighbourExternalUri = externalUri;
                regionInfo = new RegionInfo(regX, regY, neighbourInternalEndPoint, internalIpStr);

                regionInfo.RemotingPort = Convert.ToUInt32((string) responseData["remoting_port"]);
                regionInfo.RemotingAddress = internalIpStr;

                if (responseData.ContainsKey("http_port"))
                {
                    regionInfo.HttpPort = Convert.ToUInt32((string) responseData["http_port"]);
                }

                regionInfo.RegionID = new LLUUID((string) responseData["region_UUID"]);
                regionInfo.RegionName = (string) responseData["region_name"];

                if (!m_remoteRegionInfoCache.ContainsKey(regionInfo.RegionHandle))
                    m_remoteRegionInfoCache.Add(regionInfo.RegionHandle, regionInfo);
            }
            catch (WebException)
            {
                m_log.Error("[OGS1 GRID SERVICES]: " +
                            "Region lookup failed for: " + regionName +
                            " - Is the GridServer down?");
            }

            return regionInfo;
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="minX"></param>
        /// <param name="minY"></param>
        /// <param name="maxX"></param>
        /// <param name="maxY"></param>
        /// <returns></returns>
        public List<MapBlockData> RequestNeighbourMapBlocks(int minX, int minY, int maxX, int maxY)
        {
            int temp = 0;

            if (minX > maxX)
            {
                temp = minX;
                minX = maxX;
                maxX = temp;
            }
            if (minY > maxY)
            {
                temp = minY;
                minY = maxY;
                maxY = temp;
            }

            Hashtable respData = MapBlockQuery(minX, minY, maxX, maxY);

            List<MapBlockData> neighbours = new List<MapBlockData>();

            foreach (ArrayList a in respData.Values)
            {
                foreach (Hashtable n in a)
                {
                    MapBlockData neighbour = new MapBlockData();

                    neighbour.X = Convert.ToUInt16(n["x"]);
                    neighbour.Y = Convert.ToUInt16(n["y"]);

                    neighbour.Name = (string) n["name"];
                    neighbour.Access = Convert.ToByte(n["access"]);
                    neighbour.RegionFlags = Convert.ToUInt32(n["region-flags"]);
                    neighbour.WaterHeight = Convert.ToByte(n["water-height"]);
                    neighbour.MapImageId = new LLUUID((string) n["map-image-id"]);

                    neighbours.Add(neighbour);
                }
            }

            return neighbours;
        }

        /// <summary>
        /// Performs a XML-RPC query against the grid server returning mapblock information in the specified coordinates
        /// </summary>
        /// <remarks>REDUNDANT - OGS1 is to be phased out in favour of OGS2</remarks>
        /// <param name="minX">Minimum X value</param>
        /// <param name="minY">Minimum Y value</param>
        /// <param name="maxX">Maximum X value</param>
        /// <param name="maxY">Maximum Y value</param>
        /// <returns>Hashtable of hashtables containing map data elements</returns>
        private Hashtable MapBlockQuery(int minX, int minY, int maxX, int maxY)
        {
            Hashtable param = new Hashtable();
            param["xmin"] = minX;
            param["ymin"] = minY;
            param["xmax"] = maxX;
            param["ymax"] = maxY;
            IList parameters = new ArrayList();
            parameters.Add(param);
            try
            {
                XmlRpcRequest req = new XmlRpcRequest("map_block", parameters);
                XmlRpcResponse resp = req.Send(serversInfo.GridURL, 10000);
                Hashtable respData = (Hashtable) resp.Value;
                return respData;
            }
            catch (Exception e)
            {
                m_log.Error("MapBlockQuery XMLRPC failure: " + e.ToString());
                return new Hashtable();
            }
        }

        /// <summary>
        /// A ping / version check
        /// </summary>
        /// <param name="request"></param>
        /// <returns></returns>
        public XmlRpcResponse PingCheckReply(XmlRpcRequest request)
        {
            XmlRpcResponse response = new XmlRpcResponse();

            Hashtable respData = new Hashtable();
            respData["online"] = "true";

            m_localBackend.PingCheckReply(respData);

            response.Value = respData;

            return response;
        }

        // Grid Request Processing
        /// <summary>
        /// Received from the user server when a user starts logging in.  This call allows
        /// the region to prepare for direct communication from the client.  Sends back an empty
        /// xmlrpc response on completion.
        /// </summary>
        /// <param name="request"></param>
        /// <returns></returns>
        public XmlRpcResponse ExpectUser(XmlRpcRequest request)
        {
            m_log.Debug("[CONNECTION DEBUGGING]: Expect User called, starting agent setup ... ");
            Hashtable requestData = (Hashtable) request.Params[0];
            AgentCircuitData agentData = new AgentCircuitData();
            agentData.SessionID = new LLUUID((string) requestData["session_id"]);
            agentData.SecureSessionID = new LLUUID((string) requestData["secure_session_id"]);
            agentData.firstname = (string) requestData["firstname"];
            agentData.lastname = (string) requestData["lastname"];
            agentData.AgentID = new LLUUID((string) requestData["agent_id"]);
            agentData.circuitcode = Convert.ToUInt32(requestData["circuit_code"]);
            agentData.CapsPath = (string) requestData["caps_path"];

            if (requestData.ContainsKey("child_agent") && requestData["child_agent"].Equals("1"))
            {
                m_log.Debug("[CONNECTION DEBUGGING]: Child agent detected");
                agentData.child = true;
            }
            else
            {
                m_log.Debug("[CONNECTION DEBUGGING]: Main agent detected");
                agentData.startpos =
                    new LLVector3((float)Convert.ToDecimal((string)requestData["startpos_x"]),
                                  (float)Convert.ToDecimal((string)requestData["startpos_y"]),
                                  (float)Convert.ToDecimal((string)requestData["startpos_z"]));
                agentData.child = false;
            }

            ulong regionHandle = Convert.ToUInt64((string) requestData["regionhandle"]);


            RegionInfo[] regions = m_regionsOnInstance.ToArray();
            bool banned = false;

            for (int i = 0; i < regions.Length; i++)
            {
                if (regions[i] != null)
                {
                    if (regions[i].RegionHandle == regionHandle)
                    {
                        if (regions[i].EstateSettings.IsBanned(agentData.AgentID))
                        {
                            banned = true;
                            break;
                        }
                    }
                }
            }

            XmlRpcResponse resp = new XmlRpcResponse();
            
            if (banned)
            {
                m_log.InfoFormat("[OGS1 GRID SERVICES]: Denying access for user {0} {1} because user is banned",agentData.firstname,agentData.lastname);

                Hashtable respdata = new Hashtable();
                respdata["success"] = "FALSE";
                respdata["reason"] = "banned";
                resp.Value = respdata;
            }
            else
            {
                m_log.Debug("[CONNECTION DEBUGGING]: Triggering welcome for " + agentData.AgentID.ToString() + " into " + regionHandle.ToString());
                m_localBackend.TriggerExpectUser(regionHandle, agentData);
                m_log.Info("[OGS1 GRID SERVICES]: Welcoming new user...");
                Hashtable respdata = new Hashtable();  
                respdata["success"] = "TRUE";
                resp.Value = respdata;

            }
            return resp;
        }
        // Grid Request Processing
        /// <summary>
        /// Ooops, our Agent must be dead if we're getting this request!
        /// </summary>
        /// <param name="request"></param>
        /// <returns></returns>
        public XmlRpcResponse LogOffUser(XmlRpcRequest request)
        {
            m_log.Debug("[CONNECTION DEBUGGING]: LogOff User Called ");
            Hashtable requestData = (Hashtable)request.Params[0];
            string message = (string)requestData["message"];
            LLUUID agentID = LLUUID.Zero;
            LLUUID RegionSecret = LLUUID.Zero;
            Helpers.TryParse((string)requestData["agent_id"], out agentID);
            Helpers.TryParse((string)requestData["region_secret"], out RegionSecret);

            ulong regionHandle = Convert.ToUInt64((string)requestData["regionhandle"]);


            m_localBackend.TriggerLogOffUser(regionHandle, agentID, RegionSecret,message);



            return new XmlRpcResponse();
        }

        #region m_interRegion Comms

        /// <summary>
        /// Start listening for .net remoting calls from other regions.
        /// </summary>
        private void StartRemoting()
        {
            TcpChannel ch;
            try
            {
                ch = new TcpChannel((int)NetworkServersInfo.RemotingListenerPort);
                ChannelServices.RegisterChannel(ch, false); // Disabled security as Mono doesn't support this.
            }
            catch (Exception ex)
            {
                m_log.Error("[OGS1 GRID SERVICES]: Exception while attempting to listen on TCP port " + (int)NetworkServersInfo.RemotingListenerPort + ".");
                throw (ex);
            }

            WellKnownServiceTypeEntry wellType =
                new WellKnownServiceTypeEntry(typeof (OGS1InterRegionRemoting), "InterRegions",
                                              WellKnownObjectMode.Singleton);
            RemotingConfiguration.RegisterWellKnownServiceType(wellType);
            InterRegionSingleton.Instance.OnArrival += TriggerExpectAvatarCrossing;
            InterRegionSingleton.Instance.OnChildAgent += IncomingChildAgent;
            InterRegionSingleton.Instance.OnPrimGroupArrival += IncomingPrim;
            InterRegionSingleton.Instance.OnPrimGroupNear += TriggerExpectPrimCrossing;
            InterRegionSingleton.Instance.OnRegionUp += TriggerRegionUp;
            InterRegionSingleton.Instance.OnChildAgentUpdate += TriggerChildAgentUpdate;
            InterRegionSingleton.Instance.OnTellRegionToCloseChildConnection += TriggerTellRegionToCloseChildConnection;
        }

        #region Methods called by regions in this instance

        public bool ChildAgentUpdate(ulong regionHandle, ChildAgentDataUpdate cAgentData)
        {
            int failures = 0;
            lock (m_deadRegionCache)
            {
                if (m_deadRegionCache.ContainsKey(regionHandle))
                {
                    failures = m_deadRegionCache[regionHandle];
                }
            }
            if (failures <= 3)
            {
                RegionInfo regInfo = null;
                try
                {
                    if (m_localBackend.ChildAgentUpdate(regionHandle, cAgentData))
                    {
                        return true;
                    }

                    regInfo = RequestNeighbourInfo(regionHandle);
                    if (regInfo != null)
                    {
                        //don't want to be creating a new link to the remote instance every time like we are here
                        bool retValue = false;


                        OGS1InterRegionRemoting remObject = (OGS1InterRegionRemoting)Activator.GetObject(
                            typeof(OGS1InterRegionRemoting),
                            "tcp://" + regInfo.RemotingAddress +
                            ":" + regInfo.RemotingPort +
                            "/InterRegions");

                        if (remObject != null)
                        {
                            retValue = remObject.ChildAgentUpdate(regionHandle, cAgentData);
                        }
                        else
                        {
                            m_log.Warn("[OGS1 GRID SERVICES]: remoting object not found");
                        }
                        remObject = null;
//                         m_log.Info("[INTER]: " +
//                                    gdebugRegionName +
//                                    ": OGS1 tried to Update Child Agent data on outside region and got " +
//                                    retValue.ToString());

                        return retValue;
                    }
                    NoteDeadRegion(regionHandle);

                    return false;
                }
                catch (RemotingException e)
                {
                    NoteDeadRegion(regionHandle);

                    m_log.WarnFormat(
                        "[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: {0} {1},{2}",
                        regInfo.RegionName, regInfo.RegionLocX, regInfo.RegionLocY);
                    m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);

                    return false;
                }
                catch (SocketException e)
                {
                    NoteDeadRegion(regionHandle);

                    m_log.WarnFormat(
                        "[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: {0} {1},{2}",
                        regInfo.RegionName, regInfo.RegionLocX, regInfo.RegionLocY);
                    m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);

                    return false;
                }
                catch (InvalidCredentialException e)
                {
                    NoteDeadRegion(regionHandle);

                    m_log.WarnFormat(
                        "[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: {0} {1},{2}",
                        regInfo.RegionName, regInfo.RegionLocX, regInfo.RegionLocY);
                    m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);

                    return false;
                }
                catch (AuthenticationException e)
                {
                    NoteDeadRegion(regionHandle);

                    m_log.WarnFormat(
                        "[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: {0} {1},{2}",
                        regInfo.RegionName, regInfo.RegionLocX, regInfo.RegionLocY);
                    m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);

                    return false;
                }
                catch (Exception e)
                {
                    NoteDeadRegion(regionHandle);

                    m_log.WarnFormat("[OGS1 GRID SERVICES]: Unable to connect to adjacent region: {0} {1},{2}",
                                     regInfo.RegionName, regInfo.RegionLocX, regInfo.RegionLocY);
                    m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);

                    return false;
                }
            }
            else
            {
                //m_log.Info("[INTERREGION]: Skipped Sending Child Update to a region because it failed too many times:" + regionHandle.ToString());
                return false;
            }
        }

        /// <summary>
        /// Inform a region that a child agent will be on the way from a client.
        /// </summary>
        /// <param name="regionHandle"></param>
        /// <param name="agentData"></param>
        /// <returns></returns>
        public bool InformRegionOfChildAgent(ulong regionHandle, AgentCircuitData agentData)
        {
            RegionInfo regInfo = null;
            try
            {
                if (m_localBackend.InformRegionOfChildAgent(regionHandle, agentData))
                {
                    return true;
                }

                regInfo = RequestNeighbourInfo(regionHandle);
                if (regInfo != null)
                {
                    //don't want to be creating a new link to the remote instance every time like we are here
                    bool retValue = false;

                    OGS1InterRegionRemoting remObject = (OGS1InterRegionRemoting)Activator.GetObject(
                        typeof(OGS1InterRegionRemoting),
                        "tcp://" + regInfo.RemotingAddress +
                        ":" + regInfo.RemotingPort +
                        "/InterRegions");

                    if (remObject != null)
                    {
                        retValue = remObject.InformRegionOfChildAgent(regionHandle, new sAgentCircuitData(agentData));
                    }
                    else
                    {
                        m_log.Warn("[OGS1 GRID SERVICES]: remoting object not found");
                    }
                    remObject = null;
                    m_log.Info("[OGS1 GRID SERVICES]: " +
                               gdebugRegionName + ": OGS1 tried to InformRegionOfChildAgent for " +
                               agentData.firstname + " " + agentData.lastname + " and got " +
                               retValue.ToString());

                    return retValue;
                }
                NoteDeadRegion(regionHandle);
                return false;
            }
            catch (RemotingException e)
            {
                NoteDeadRegion(regionHandle);

                m_log.WarnFormat(
                    "[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: {0} {1},{2}",
                    regInfo.RegionName, regInfo.RegionLocX, regInfo.RegionLocY);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);

                return false;
            }
            catch (SocketException e)
            {
                NoteDeadRegion(regionHandle);

                m_log.WarnFormat(
                    "[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: {0} {1},{2}",
                    regInfo.RegionName, regInfo.RegionLocX, regInfo.RegionLocY);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);

                return false;
            }
            catch (InvalidCredentialException e)
            {
                NoteDeadRegion(regionHandle);

                m_log.WarnFormat(
                    "[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: {0} {1},{2}",
                    regInfo.RegionName, regInfo.RegionLocX, regInfo.RegionLocY);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);

                return false;
            }
            catch (AuthenticationException e)
            {
                NoteDeadRegion(regionHandle);

                m_log.WarnFormat(
                    "[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: {0} {1},{2}",
                    regInfo.RegionName, regInfo.RegionLocX, regInfo.RegionLocY);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);

                return false;
            }
            catch (Exception e)
            {
                NoteDeadRegion(regionHandle);

                m_log.WarnFormat(
                    "[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: {0} {1},{2}",
                    regInfo.RegionName, regInfo.RegionLocX, regInfo.RegionLocY);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);

                return false;
            }
        }

        // UGLY!
        public bool RegionUp(SerializableRegionInfo region, ulong regionhandle)
        {
            SerializableRegionInfo regInfo = null;
            try
            {
                // You may ask why this is in here...
                // The region asking the grid services about itself..
                // And, surprisingly, the reason is..  it doesn't know
                // it's own remoting port!  How special.
                RegionUpData regiondata = new RegionUpData(region.RegionLocX, region.RegionLocY, region.ExternalHostName, region.InternalEndPoint.Port);

                region = new SerializableRegionInfo(RequestNeighbourInfo(region.RegionHandle));
                region.RemotingAddress = region.ExternalHostName;
                region.RemotingPort = NetworkServersInfo.RemotingListenerPort;
                region.HttpPort = serversInfo.HttpListenerPort;

                if (m_localBackend.RegionUp(region, regionhandle))
                {
                    return true;
                }

                regInfo = new SerializableRegionInfo(RequestNeighbourInfo(regionhandle));
                if (regInfo != null)
                {
                    // If we're not trying to remote to ourselves.
                    if (regInfo.RemotingAddress != region.RemotingAddress && region.RemotingAddress != null)
                    {
                        //don't want to be creating a new link to the remote instance every time like we are here
                        bool retValue = false;

                        OGS1InterRegionRemoting remObject = (OGS1InterRegionRemoting) Activator.GetObject(
                            typeof(OGS1InterRegionRemoting),
                            "tcp://" +
                            regInfo.RemotingAddress +
                            ":" + regInfo.RemotingPort +
                            "/InterRegions");

                        if (remObject != null)
                        {
                            retValue = remObject.RegionUp(regiondata, regionhandle);
                        }
                        else
                        {
                            m_log.Warn("[OGS1 GRID SERVICES]: remoting object not found");
                        }
                        remObject = null;
                        m_log.Info("[INTER]: " + gdebugRegionName + ": OGS1 tried to inform region I'm up");

                        return retValue;
                    }
                    else
                    {
                        // We're trying to inform ourselves via remoting.
                        // This is here because we're looping over the listeners before we get here.
                        // Odd but it should work.
                        return true;
                    }
                }

                return false;
            }
            catch (RemotingException e)
            {
                m_log.Warn("[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region using tcp://" +
                           regInfo.RemotingAddress +
                           ":" + regInfo.RemotingPort +
                           "/InterRegions - @ " + regInfo.RegionLocX + "," + regInfo.RegionLocY +
                           " - Is this neighbor up?");
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                return false;
            }
            catch (SocketException e)
            {
                m_log.Warn("[OGS1 GRID SERVICES]: Socket Error: Unable to connect to adjacent region using tcp://" +
                           regInfo.RemotingAddress +
                           ":" + regInfo.RemotingPort +
                           "/InterRegions - @ " + regInfo.RegionLocX + "," + regInfo.RegionLocY +
                           " - Is this neighbor up?");
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                return false;
            }
            catch (InvalidCredentialException e)
            {
                m_log.Warn("[OGS1 GRID SERVICES]: Invalid Credentials: Unable to connect to adjacent region using tcp://" +
                           regInfo.RemotingAddress +
                           ":" + regInfo.RemotingPort +
                           "/InterRegions - @ " + regInfo.RegionLocX + "," + regInfo.RegionLocY);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                return false;
            }
            catch (AuthenticationException e)
            {
                m_log.Warn("[OGS1 GRID SERVICES]: Authentication exception: Unable to connect to adjacent region using tcp://" +
                           regInfo.RemotingAddress +
                           ":" + regInfo.RemotingPort +
                           "/InterRegions - @ " + regInfo.RegionLocX + "," + regInfo.RegionLocY);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                return false;
            }
            catch (Exception e)
            {
                // This line errors with a Null Reference Exception..    Why?  @.@
                //m_log.Warn("Unknown exception: Unable to connect to adjacent region using tcp://" + regInfo.RemotingAddress +
                // ":" + regInfo.RemotingPort +
                //"/InterRegions - @ " + regInfo.RegionLocX + "," + regInfo.RegionLocY + " - This is likely caused by an incompatibility in the protocol between this sim and that one");
                m_log.Debug(e.ToString());
                return false;
            }
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="regionHandle"></param>
        /// <param name="agentData"></param>
        /// <returns></returns>
        public bool InformRegionOfPrimCrossing(ulong regionHandle, LLUUID primID, string objData, int XMLMethod)
        {
            int failures = 0;
            lock (m_deadRegionCache)
            {
                if (m_deadRegionCache.ContainsKey(regionHandle))
                {
                    failures = m_deadRegionCache[regionHandle];
                }
            }
            if (failures <= 1)
            {
                RegionInfo regInfo = null;
                try
                {
                    if (m_localBackend.InformRegionOfPrimCrossing(regionHandle, primID, objData, XMLMethod))
                    {
                        return true;
                    }

                    regInfo = RequestNeighbourInfo(regionHandle);
                    if (regInfo != null)
                    {
                        //don't want to be creating a new link to the remote instance every time like we are here
                        bool retValue = false;

                        OGS1InterRegionRemoting remObject = (OGS1InterRegionRemoting)Activator.GetObject(
                            typeof(OGS1InterRegionRemoting),
                            "tcp://" + regInfo.RemotingAddress +
                            ":" + regInfo.RemotingPort +
                            "/InterRegions");

                        if (remObject != null)
                        {
                            retValue = remObject.InformRegionOfPrimCrossing(regionHandle, primID.UUID, objData, XMLMethod);
                        }
                        else
                        {
                            m_log.Warn("[OGS1 GRID SERVICES]: Remoting object not found");
                        }
                        remObject = null;

                        return retValue;
                    }
                    NoteDeadRegion(regionHandle);
                    return false;
                }
                catch (RemotingException e)
                {
                    NoteDeadRegion(regionHandle);
                    m_log.Warn("[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: " + regionHandle);
                    m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                    return false;
                }
                catch (SocketException e)
                {
                    NoteDeadRegion(regionHandle);
                    m_log.Warn("[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: " + regionHandle);
                    m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                    return false;
                }
                catch (InvalidCredentialException e)
                {
                    NoteDeadRegion(regionHandle);
                    m_log.Warn("[OGS1 GRID SERVICES]: Invalid Credential Exception: Invalid Credentials : " + regionHandle);
                    m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                    return false;
                }
                catch (AuthenticationException e)
                {
                    NoteDeadRegion(regionHandle);
                    m_log.Warn("[OGS1 GRID SERVICES]: Authentication exception: Unable to connect to adjacent region: " + regionHandle);
                    m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                    return false;
                }
                catch (Exception e)
                {
                    NoteDeadRegion(regionHandle);
                    m_log.Warn("[OGS1 GRID SERVICES]: Unknown exception: Unable to connect to adjacent region: " + regionHandle);
                    m_log.DebugFormat("[OGS1 GRID SERVICES]: {0}", e);
                    return false;
                }
            }
            else
            {
                return false;
            }
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="regionHandle"></param>
        /// <param name="agentID"></param>
        /// <param name="position"></param>
        /// <returns></returns>
        public bool ExpectAvatarCrossing(ulong regionHandle, LLUUID agentID, LLVector3 position, bool isFlying)
        {
            RegionInfo[] regions = m_regionsOnInstance.ToArray();
            bool banned = false;

            for (int i = 0; i < regions.Length; i++)
            {
                if (regions[i] != null)
                {
                    if (regions[i].RegionHandle == regionHandle)
                    {
                        if (regions[i].EstateSettings.IsBanned(agentID))
                        {
                            banned = true;
                            break;
                        }
                    }
                }
            }

            if (banned)
                return false;

            RegionInfo regInfo = null;
            try
            {
                if (m_localBackend.TriggerExpectAvatarCrossing(regionHandle, agentID, position, isFlying))
                {
                    return true;
                }

                regInfo = RequestNeighbourInfo(regionHandle);
                if (regInfo != null)
                {
                    bool retValue = false;
                    OGS1InterRegionRemoting remObject = (OGS1InterRegionRemoting) Activator.GetObject(
                        typeof (OGS1InterRegionRemoting),
                        "tcp://" + regInfo.RemotingAddress +
                        ":" + regInfo.RemotingPort +
                        "/InterRegions");

                    if (remObject != null)
                    {
                        retValue =
                            remObject.ExpectAvatarCrossing(regionHandle, agentID.UUID, new sLLVector3(position),
                                                           isFlying);
                    }
                    else
                    {
                        m_log.Warn("[OGS1 GRID SERVICES]: Remoting object not found");
                    }
                    remObject = null;

                    return retValue;
                }
                //TODO need to see if we know about where this region is and use .net remoting
                // to inform it.
                NoteDeadRegion(regionHandle);
                return false;
            }
            catch (RemotingException e)
            {
                NoteDeadRegion(regionHandle);

                m_log.WarnFormat(
                    "[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: {0} {1},{2}",
                    regInfo.RegionName, regInfo.RegionLocX, regInfo.RegionLocY);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);

                return false;
            }
            catch
            {
                NoteDeadRegion(regionHandle);
                return false;
            }
        }

        public bool ExpectPrimCrossing(ulong regionHandle, LLUUID agentID, LLVector3 position, bool isPhysical)
        {
            RegionInfo regInfo = null;
            try
            {
                if (m_localBackend.TriggerExpectPrimCrossing(regionHandle, agentID, position, isPhysical))
                {
                    return true;
                }

                regInfo = RequestNeighbourInfo(regionHandle);
                if (regInfo != null)
                {
                    bool retValue = false;
                    OGS1InterRegionRemoting remObject = (OGS1InterRegionRemoting) Activator.GetObject(
                        typeof (OGS1InterRegionRemoting),
                        "tcp://" + regInfo.RemotingAddress +
                        ":" + regInfo.RemotingPort +
                        "/InterRegions");

                    if (remObject != null)
                    {
                        retValue =
                            remObject.ExpectAvatarCrossing(regionHandle, agentID.UUID, new sLLVector3(position),
                                                           isPhysical);
                    }
                    else
                    {
                        m_log.Warn("[OGS1 GRID SERVICES]: Remoting object not found");
                    }
                    remObject = null;

                    return retValue;
                }
                //TODO need to see if we know about where this region is and use .net remoting
                // to inform it.
                NoteDeadRegion(regionHandle);
                return false;
            }
            catch (RemotingException e)
            {
                NoteDeadRegion(regionHandle);
                m_log.Warn("[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: " + regionHandle);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                return false;
            }
            catch (SocketException e)
            {
                NoteDeadRegion(regionHandle);
                m_log.Warn("[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region: " + regionHandle);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                return false;
            }
            catch (InvalidCredentialException e)
            {
                NoteDeadRegion(regionHandle);
                m_log.Warn("[OGS1 GRID SERVICES]: Invalid Credential Exception: Invalid Credentials : " + regionHandle);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                return false;
            }
            catch (AuthenticationException e)
            {
                NoteDeadRegion(regionHandle);
                m_log.Warn("[OGS1 GRID SERVICES]: Authentication exception: Unable to connect to adjacent region: " + regionHandle);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                return false;
            }
            catch (Exception e)
            {
                NoteDeadRegion(regionHandle);
                m_log.Warn("[OGS1 GRID SERVICES]: Unknown exception: Unable to connect to adjacent region: " + regionHandle);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0}", e);
                return false;
            }
        }

        public bool TellRegionToCloseChildConnection(ulong regionHandle, LLUUID agentID)
        {
            RegionInfo regInfo = null;
            try
            {
                if (m_localBackend.TriggerTellRegionToCloseChildConnection(regionHandle, agentID))
                {
                    return true;
                }

                regInfo = RequestNeighbourInfo(regionHandle);
                if (regInfo != null)
                {
                    // bool retValue = false;
                    OGS1InterRegionRemoting remObject = (OGS1InterRegionRemoting)Activator.GetObject(
                        typeof(OGS1InterRegionRemoting),
                        "tcp://" + regInfo.RemotingAddress +
                        ":" + regInfo.RemotingPort +
                        "/InterRegions");

                    if (remObject != null)
                    {
                        // retValue =
                        remObject.TellRegionToCloseChildConnection(regionHandle, agentID.UUID);
                    }
                    else
                    {
                        m_log.Warn("[OGS1 GRID SERVICES]: Remoting object not found");
                    }
                    remObject = null;

                    return true;
                }
                //TODO need to see if we know about where this region is and use .net remoting
                // to inform it.
                NoteDeadRegion(regionHandle);
                return false;
            }
            catch (RemotingException)
            {
                NoteDeadRegion(regionHandle);
                m_log.Warn("[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region to tell it to close child agents: " + regInfo.RegionName +
                           " " + regInfo.RegionLocX + "," + regInfo.RegionLocY);
                //m_log.Debug(e.ToString());
                return false;
            }
            catch (SocketException e)
            {
                NoteDeadRegion(regionHandle);
                m_log.Warn("[OGS1 GRID SERVICES]: Socket Error: Unable to connect to adjacent region using tcp://" +
                           regInfo.RemotingAddress +
                           ":" + regInfo.RemotingPort +
                           "/InterRegions - @ " + regInfo.RegionLocX + "," + regInfo.RegionLocY +
                           " - Is this neighbor up?");
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                return false;
            }
            catch (InvalidCredentialException e)
            {
                NoteDeadRegion(regionHandle);
                m_log.Warn("[OGS1 GRID SERVICES]: Invalid Credentials: Unable to connect to adjacent region using tcp://" +
                           regInfo.RemotingAddress +
                           ":" + regInfo.RemotingPort +
                           "/InterRegions - @ " + regInfo.RegionLocX + "," + regInfo.RegionLocY);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                return false;
            }
            catch (AuthenticationException e)
            {
                NoteDeadRegion(regionHandle);
                m_log.Warn("[OGS1 GRID SERVICES]: Authentication exception: Unable to connect to adjacent region using tcp://" +
                           regInfo.RemotingAddress +
                           ":" + regInfo.RemotingPort +
                           "/InterRegions - @ " + regInfo.RegionLocX + "," + regInfo.RegionLocY);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                return false;
            }
            catch (WebException e)
            {
                NoteDeadRegion(regionHandle);
                m_log.Warn("[OGS1 GRID SERVICES]: WebException exception: Unable to connect to adjacent region using tcp://" +
                           regInfo.RemotingAddress +
                           ":" + regInfo.RemotingPort +
                           "/InterRegions - @ " + regInfo.RegionLocX + "," + regInfo.RegionLocY);
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0} {1}", e.Source, e.Message);
                return false;
            }
            catch (Exception e)
            {
                NoteDeadRegion(regionHandle);
                // This line errors with a Null Reference Exception..    Why?  @.@
                //m_log.Warn("Unknown exception: Unable to connect to adjacent region using tcp://" + regInfo.RemotingAddress +
                // ":" + regInfo.RemotingPort +
                //"/InterRegions - @ " + regInfo.RegionLocX + "," + regInfo.RegionLocY + " - This is likely caused by an incompatibility in the protocol between this sim and that one");
                m_log.DebugFormat("[OGS1 GRID SERVICES]: {0}", e);
                return false;
            }
        }

        public bool AcknowledgeAgentCrossed(ulong regionHandle, LLUUID agentId)
        {
            return m_localBackend.AcknowledgeAgentCrossed(regionHandle, agentId);
        }

        public bool AcknowledgePrimCrossed(ulong regionHandle, LLUUID primId)
        {
            return m_localBackend.AcknowledgePrimCrossed(regionHandle, primId);
        }

        #endregion

        #region Methods triggered by calls from external instances

        /// <summary>
        ///
        /// </summary>
        /// <param name="regionHandle"></param>
        /// <param name="agentData"></param>
        /// <returns></returns>
        public bool IncomingChildAgent(ulong regionHandle, AgentCircuitData agentData)
        {
            //m_log.Info("[INTER]: " + gdebugRegionName + ": Incoming OGS1 Agent " + agentData.firstname + " " + agentData.lastname);

            try
            {
                return m_localBackend.IncomingChildAgent(regionHandle, agentData);
            }
            catch (RemotingException)
            {
                //m_log.Error("Remoting Error: Unable to connect to adjacent region.\n" + e.ToString());
                return false;
            }
        }

        public bool TriggerRegionUp(RegionUpData regionData, ulong regionhandle)
        {
            m_log.Info("[OGS1 GRID SERVICES]: " +
                       gdebugRegionName + "Incoming OGS1 RegionUpReport:  " + "(" + regionData.X +
                       "," + regionData.Y + "). Giving this region a fresh set of 'dead' tries");
            RegionInfo nRegionInfo = new RegionInfo();
            nRegionInfo.SetEndPoint("127.0.0.1", regionData.PORT);
            nRegionInfo.ExternalHostName = regionData.IPADDR;
            nRegionInfo.RegionLocX = regionData.X;
            nRegionInfo.RegionLocY = regionData.Y;


            try
            {
                lock (m_deadRegionCache)
                {
                    if (m_deadRegionCache.ContainsKey(nRegionInfo.RegionHandle))
                    {
                        m_deadRegionCache.Remove(nRegionInfo.RegionHandle);
                    }
                }

                return m_localBackend.TriggerRegionUp(nRegionInfo, regionhandle);
            }

            catch (RemotingException e)
            {
                m_log.Error("[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region.\n" + e.ToString());
                return false;
            }
        }

        public bool TriggerChildAgentUpdate(ulong regionHandle, ChildAgentDataUpdate cAgentData)
        {
            //m_log.Info("[INTER]: Incoming OGS1 Child Agent Data Update");

            try
            {
                return m_localBackend.TriggerChildAgentUpdate(regionHandle, cAgentData);
            }
            catch (RemotingException e)
            {
                m_log.Error("[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region.\n" + e.ToString());
                return false;
            }
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="regionHandle"></param>
        /// <param name="agentData"></param>
        /// <returns></returns>
        public bool IncomingPrim(ulong regionHandle, LLUUID primID, string objData, int XMLMethod)
        {
            // Is this necessary?
            try
            {
                m_localBackend.TriggerExpectPrim(regionHandle, primID, objData, XMLMethod);
                return true;
                //m_localBackend.
            }
            catch (RemotingException e)
            {
                m_log.Error("[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region.\n" + e.ToString());
                return false;
            }
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="regionHandle"></param>
        /// <param name="agentID"></param>
        /// <param name="position"></param>
        /// <returns></returns>
        public bool TriggerExpectAvatarCrossing(ulong regionHandle, LLUUID agentID, LLVector3 position, bool isFlying)
        {
            try
            {
                return m_localBackend.TriggerExpectAvatarCrossing(regionHandle, agentID, position, isFlying);
            }
            catch (RemotingException e)
            {
                m_log.Error("[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region.\n" + e.ToString());
                return false;
            }
        }

        public bool TriggerExpectPrimCrossing(ulong regionHandle, LLUUID agentID, LLVector3 position, bool isPhysical)
        {
            try
            {
                return m_localBackend.TriggerExpectPrimCrossing(regionHandle, agentID, position, isPhysical);
            }
            catch (RemotingException e)
            {
                m_log.Error("[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to adjacent region.\n" + e.ToString());
                return false;
            }
        }

        public bool TriggerTellRegionToCloseChildConnection(ulong regionHandle, LLUUID agentID)
        {
            try
            {
                return m_localBackend.TriggerTellRegionToCloseChildConnection(regionHandle, agentID);
            }
            catch (RemotingException)
            {
                m_log.Info("[OGS1 GRID SERVICES]: Remoting Error: Unable to connect to neighbour to tell it to close a child connection");
                return false;
            }
        }

        #endregion

        #endregion

        int timeOut = 10; //10 seconds

        public bool CheckRegion(string address, uint port, bool retry)
        {
            bool available = false;
            bool timed_out = true;

            IPAddress ia;
            IPAddress.TryParse(address, out ia);
            IPEndPoint m_EndPoint = new IPEndPoint(ia, (int)port);

            AsyncCallback callback = delegate(IAsyncResult iar)
            {
                Socket s = (Socket)iar.AsyncState;
                try
                {
                    s.EndConnect(iar);
                    available = true;
                    timed_out = false;
                }
                catch (Exception e)
                {
                    m_log.DebugFormat("Callback EndConnect exception: {0}:{1}", e.Message, e.StackTrace);
                }

                s.Close();
            };

            try
            {
                Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
                IAsyncResult ar = socket.BeginConnect(m_EndPoint, callback, socket);
                ar.AsyncWaitHandle.WaitOne(timeOut * 1000, false);
            }
            catch (Exception e)
            {
                m_log.DebugFormat("CheckRegion Socket Setup exception: {0}:{1}", e.Message, e.StackTrace);
                return false;
            }

            if (timed_out)
            {
                m_log.DebugFormat("socket [{0}] timed out ({1}) waiting to obtain a connection.", m_EndPoint, timeOut * 1000);

                if (retry)
                {
                    return CheckRegion(address, port, false);
                }
            }

            return available;
        }

        public bool CheckRegion(string address, uint port)
        {
            return CheckRegion(address, port, true);
        }

        public void NoteDeadRegion(ulong regionhandle)
        {
            lock (m_deadRegionCache)
            {
                if (m_deadRegionCache.ContainsKey(regionhandle))
                {
                    m_deadRegionCache[regionhandle] = m_deadRegionCache[regionhandle] + 1;
                }
                else
                {
                    m_deadRegionCache.Add(regionhandle, 1);
                }
            }
        }
    }
}