box-o-sand/ruby-sockets/ping-pong/em-server.rb

require 'eventmachine'

module PongServer
  def post_init
    puts "server: Got me a client!"
  end

  def receive_data(data)
    if data =~ /PING/
      puts 'server: RECV PING'
      send_data("PONG\n")
    else
      puts "server: RECV #{data}"
      send_data("NOPE\n")
    end
  end

  def unbind
    puts "server: So long, client!"
  end
end

EventMachine.run do
  EventMachine.start_server('0.0.0.0', 24000, PongServer)
  puts 'Listening on 0.0.0.0:24000'
end