Chat Application

datagram_server.rb

require 'socket'
#this is like the chat room..

port = ARGV[0]

ds = UDPSocket.new

ds.bind(nil,port)

$b = IO.new(2,"w+")

$client_id = 1
$clients = []
$flag = 0

loop do

  request, address = ds.recvfrom(1024)
  response = request
  clientaddr = address[3]
  clientname = address[2]
  clientport = address[1]

  if ( $clients.empty? )
    $clients[$client_id-1] = clientport
    puts "Client #{$client_id} enters the chat room "
    $client_id += 1
    puts "#{$clients}"
  else
    unless $clients.include? clientport       
      puts "Client #{$client_id} enters the chat room "
      $clients[$client_id-1] = clientport
      $client_id += 1
    end
  end

  if( response.chop != "quit")
    puts "Client #{clientport}  says: #{response} "
  else
    puts "Client #{clientport} leaves the chat room "
    $client_id -= 1
  end

  if($client_id == 1)
    print " Do you want to close the chat room(y/n)?: "
    a = $b.readline
    if ( a.chop == "y")
      break
    end
  end
end