From: Dhiraj Girdhar <dgirdhar@...>
Date: 2007-07-05T13:56:22+09:00
Subject: Chat server telnet client problem

Hi,
I copied chat server code from one or Ruby site.
Following code is working fine But I am facing very small problem, when
i am launching any client using telnet, then I am not able to see what I
am typing on client console.
example :
> telnet localhost 7666

Please help me to find out the problem.


Regards:
Dhiraj

require 'socket'
class ChatServer

   def initialize(port) #Instantiating the server
      @sockets_in = Array.new
      @serv_sock = TCPServer.new("",port)
      @serv_sock.setsockopt(Socket::SOL_SOCKET, Socket::SO_REUSEADDR, 1)
      puts "Chat server started on port #{port}."
      @sockets_in.push(@serv_sock)
   end

   def run # The runtime code for the server
      while true
         someone_there = select(@sockets_in, nil, nil, nil)
         if someone_there != nil #Someone IS there, maybe wanting to
talk?
            for socket in someone_there[0] #Check the sockets array
               #Do we have a connect,...
               if socket == @serv_sock then
                  accept_new
               else
               #...or did they leave,...
                  if socket.eof? then #If it sends an end of file notice
- client disconnected.
                     str = "Client left
#{socket.peeraddr[2]}:#{socket.peeraddr[1]}."
                     broadcast_string(str,socket)
                     socket.close
                     @sockets_in.delete(socket)
                  else
               #...or are they talking?
                     str = "#{socket.peeraddr[2]}:#{socket.peeraddr[1]}
says: #{socket.gets}"
                     broadcast_string(str,socket)
                  end
               end
            end
         end
      end
   end

   private

   def broadcast_string(str,omit_sock) #Broadcasts the string to all
available receiving sockets.
      @sockets_in.each do |client_sock| #each socket in the @sockets_in
array do this:
         if client_sock != @serv_sock && client_sock != omit_sock #if
it's not the server socket, and not the one that sent it...
            client_sock.write(str) #...write it to the client.
         end
      end
      #and just to keep track on the server end...
      puts(str)
   end

   def accept_new #accepts a new connection.
      new_sock = @serv_sock.accept
      @sockets_in.push(new_sock) #add new socket to sockets array.
      new_sock.write("Welcome to Ruby Chat!") #let them feel welcome.
      str = "Someone joined
(#{new_sock.peeraddr[2]}:#{new_sock.peeraddr[1]})."
      broadcast_string(str,new_sock) #let everyone know someone came in.
   end

end

myChat = ChatServer.new(7680)
myChat.run

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