/source/library/Interlace/ReactorCore/DatagramSocketConnector.cs

#region Using Directives and Copyright Notice



// Copyright (c) 2007-2010, Computer Consultancy Pty Ltd

// All rights reserved.

// 

// 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 Computer Consultancy Pty Ltd 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COMPUTER CONSULTANCY PTY LTD 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.Net;

using System.Net.Sockets;

using System.Text;



using Interlace.Utilities;



#endregion



namespace Interlace.ReactorCore

{

    class DatagramSocketConnector

    {

        Socket _socket = null;

        Reactor _reactor;

        IProtocolFactory _factory = null;



        public DatagramSocketConnector(Reactor reactor)

        {

            _reactor = reactor;

        }



        public void Bind(IProtocolFactory factory)

        {

            BindInternal(factory, new IPEndPoint(IPAddress.Any, 0), null);

        }



        public void Bind(IProtocolFactory factory, int localPort)

        {

            BindInternal(factory, new IPEndPoint(IPAddress.Any, localPort), null);

        }



        public void Bind(IProtocolFactory factory, IPAddress localAddress, int localPort)

        {

            BindInternal(factory, new IPEndPoint(localAddress, localPort), null);

        }



        public void BindToPeer(IProtocolFactory factory, string addressString, int port)

        {

            IPAddress address;



            if (IPAddress.TryParse(addressString, out address))

            {

                BindToPeer(factory, address, port);

            }

            else

            {

                IAsyncResult result = Dns.BeginGetHostEntry(addressString, null, 

                    new Pair<string, int>(addressString, port));



                _reactor.AddResult(result, BindToResolveCompleted, 0, factory);

            }

        }



        void BindToResolveCompleted(IAsyncResult result, object state)

        {

            IProtocolFactory factory = state as IProtocolFactory;

            Pair<string, int> pair = result.AsyncState as Pair<string, int>;



            IPHostEntry entry;



            entry = Dns.EndGetHostEntry(result);



            if (entry.AddressList.Length == 0)

            {

                _factory.ConnectionFailed(new ApplicationException(string.Format(

                    "Address resolution for the address \"{0}\" failed.",

                    pair.First)));

            }

            else

            {

                BindToPeer(factory, entry.AddressList[0], pair.Second);

            }

        }



        public void BindToPeer(IProtocolFactory factory, IPAddress address, int port)

        {

            BindInternal(factory, new IPEndPoint(IPAddress.Any, 0), new IPEndPoint(address, port));

        }



        public void BindToPeer(IProtocolFactory factory, IPEndPoint peer)

        {

            BindInternal(factory, new IPEndPoint(IPAddress.Any, 0), peer);

        }



        void BindInternal(IProtocolFactory factory, IPEndPoint local, IPEndPoint remote)

        {

            _socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

            _factory = factory;



            _factory.StartedConnecting();



            try

            {

                _socket.Bind(local);



                if (remote != null)

                {

                    _socket.Connect(remote);

                }

            }

            catch (SocketException ex)

            {

                _factory.ConnectionFailed(ex);



                return;

            }

            catch (ObjectDisposedException ex)

            {

                _factory.ConnectionFailed(ex);



                return;

            }



            Protocol protocol = _factory.BuildProtocol();



            SocketConnection connection = new DatagramSocketConnection(_reactor, protocol);

            connection.StartConnection(_socket, protocol.ReceiveBufferSize);

            protocol.MakeConnection(connection);

        }

    }

}