From d27ce639722587647bc812032c55fc8438609705 Mon Sep 17 00:00:00 2001
From: fcolin
Date: Thu, 1 Feb 2007 10:03:06 +0000
Subject:  Utilisateur : Fcolin       Date : 19/05/03   Heure : 15:31 Créé
 Commentaire:  (vss 1)

---
 CSharp/Ivy/IvyPPC/IvyWatcher.cs | 217 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 217 insertions(+)
 create mode 100644 CSharp/Ivy/IvyPPC/IvyWatcher.cs

diff --git a/CSharp/Ivy/IvyPPC/IvyWatcher.cs b/CSharp/Ivy/IvyPPC/IvyWatcher.cs
new file mode 100644
index 0000000..749d837
--- /dev/null
+++ b/CSharp/Ivy/IvyPPC/IvyWatcher.cs
@@ -0,0 +1,217 @@
+/// <summary> IvyWatcher, A private Class for the Ivy rendezvous
+/// *
+/// </summary>
+/// <author> François-Régis Colin
+/// </author>
+/// <author> <a href="http://www.tls.cena.fr/products/ivy/">http://www.tls.cena.fr/products/ivy/</a>
+/// *
+/// (C) CENA
+/// *
+/// right now, the rendez vous is either an UDP socket or a TCP multicast.
+/// The watcher will answer to
+/// each peer advertising its arrival on the bus. The intrinsics of Unix are so
+/// that the broadcast is done using the same socket, which is not a good
+/// thing.
+/// *
+/// 
+/// </author>
+namespace IvyBus
+{
+	using System;
+	using System.Threading;
+	using System.IO;
+	using System.Net;
+	using System.Net.Sockets;
+	using System.Text.RegularExpressions;
+	using System.Configuration;
+	using System.Text;
+	
+	
+	class IvyWatcher
+	{
+		private bool isMulticastAddress = false;
+		private Ivy bus; /* master bus controler */
+		private Socket broadcast; /* supervision socket */// To do reuseaddr we must use a Socket not a udp client
+		private String domainaddr;
+		private int port;
+		private volatile Thread listenThread;
+		private IPAddress group;
+		
+		/// <summary> creates an Ivy watcher
+		/// </summary>
+		/// <param name="bus">the bus
+		/// </param>
+		/// <param name="net">the domain
+		/// 
+		/// </param>
+		internal IvyWatcher(Ivy bus, String domainaddr, int port)
+		{
+			this.bus = bus;
+			this.domainaddr = domainaddr;
+			this.port = port;
+			listenThread = new Thread(new ThreadStart(this.Run));
+			// create the MulticastSocket
+			try
+			{
+				group = Dns.GetHostByName(domainaddr).AddressList[0];
+				broadcast = new Socket(AddressFamily.InterNetwork, SocketType.Dgram,ProtocolType.Udp);
+				IPEndPoint EPhost = new IPEndPoint(IPAddress.Any, port);
+				broadcast.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast,1);
+				broadcast.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress,1);
+				broadcast.Bind(EPhost);
+				
+				//test isMulticastAddress // TODO better check   
+				if ((group.Address & 0xf0000000) == 0xe0000000)
+				{
+					isMulticastAddress = true;
+					broadcast.SetSocketOption(SocketOptionLevel.Udp, SocketOptionName.AddMembership, new MulticastOption( group ));					
+				}
+			}
+			catch (IOException e)
+			{
+				throw new IvyException("IvyWatcher I/O error" + e);
+			}
+		}
+		
+		/// <summary> the behaviour of each thread watching the UDP socket.
+		/// </summary>
+		public void  Run()
+		{
+			traceDebug("beginning of a watcher Thread");
+			byte[] buf = new byte[4096];
+			int len;
+			IPEndPoint remoteEP =  new IPEndPoint(IPAddress.Any, 0);
+			EndPoint tempRemoteEP = (EndPoint)remoteEP;
+
+			remoteEP = null;
+			try
+			{
+				bool running = true;
+				while (running)
+				{
+					int port;
+					try
+					{
+						len = broadcast.ReceiveFrom(buf, ref tempRemoteEP);
+						// I was summoned to leave during the receive
+						String msg = Encoding.ASCII.GetString(buf);
+						remoteEP = (IPEndPoint)tempRemoteEP;
+						IPAddress remotehost = remoteEP.Address;
+						traceDebug("BUSWATCHER Receive Broadcast from " + Dns.GetHostName() + ":" + remoteEP.Port);
+						// TODO if ( !isInDomain( remotehost ) ) continue;
+						String[] st = msg.Split(' ');
+						if (st.Length != 2)
+						{
+							Console.Error.WriteLine("Bad format " + msg);
+							continue;
+						}
+						int version = Int32.Parse(st[0]);
+						port = Int32.Parse(st[1]);
+						if (version != Ivy.PROCOCOLVERSION)
+						{
+							Console.Error.WriteLine("Ignoring bad protocol version broadcast");
+							continue;
+						}
+						
+						if ((bus.applicationPort == port))
+							continue;
+						traceDebug("BUSWATCHER Broadcast de " + Dns.GetHostName() + ":" + remoteEP.Port + " port " + port + " version " + version);
+						try
+						{
+							MyTcpClient socket = new MyTcpClient(remoteEP.Address.ToString(),port);
+							bus.addClient(socket);
+						}
+						catch (Exception e)
+						{
+							Console.Error.WriteLine("can't connect to " + remotehost + " port " + port + " \n"+ e.Message);
+						}
+					}
+					catch (IOException jii)
+					{
+						running = false;
+					}
+				} // while
+			}
+			catch (SocketException se)
+			{
+				traceDebug( "watcher socket closed" );
+			}
+			catch (IOException ioe)
+			{
+				Console.Error.WriteLine( ioe.StackTrace );
+			}
+			traceDebug("end of a watcher thread");
+		}
+		
+		/// <summary> stops the thread waiting on the broadcast socket
+		/// </summary>
+		internal virtual void  stop()
+		{
+			lock(this)
+			{
+				traceDebug("begining stopping an IvyWatcher");
+				Thread t = listenThread;
+				listenThread = null;
+				broadcast.Close();
+				if (t != null)
+				{
+					t.Interrupt();
+				}
+				// it might not even have been created
+				traceDebug("ending stopping an IvyWatcher");
+			}
+		}
+		
+		internal virtual void  start()
+		{
+			lock(this)
+			{
+				String hello = Ivy.PROCOCOLVERSION + " " + bus.applicationPort + "\n";
+				listenThread.Start();
+				byte[] hellob = Encoding.ASCII.GetBytes( hello );
+				IPEndPoint EPhost = new IPEndPoint(group, port);
+				broadcast.SendTo(hellob,0,EPhost); // notifies our arrival on each domain: protocol version + port
+			}
+		}
+		
+		
+		internal static String getDomain(String net)
+		{
+			int sep_index = net.LastIndexOf(":");
+			if (sep_index != - 1)
+			{
+				net = net.Substring(0, (sep_index) - (0));
+			}
+			try
+			{
+				net += ".255.255.255";
+				Regex exp = new Regex("^(\\d+\\.\\d+\\.\\d+\\.\\d+).*");
+				net = exp.Replace(net, "$1");
+			}
+			catch (ArgumentException e)
+			{
+				Console.Out.WriteLine("Bad broascat addr " + net);
+				return null;
+			}
+			// out.println("net: "+net);
+			return net;
+		}
+		
+		internal static int getPort(String net)
+		{
+			int sep_index = net.LastIndexOf(":");
+			int port = (sep_index == - 1)?Ivy.DEFAULT_PORT:Int32.Parse(net.Substring(sep_index + 1));
+			// out.println("net: ["+net+"]\nsep_index: "+sep_index+"\nport: "+port);
+			return port;
+		}
+		
+		
+		private void  traceDebug(String s)
+		{
+			if (bus.Debug)
+				Console.Out.WriteLine("-->ivywatcher<-- " + s);
+		}
+	}
+	// class IvyWatcher
+	/* EOF */
+}
\ No newline at end of file
-- 
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