require 'rubygems'
require 'eventmachine'
 
module PortTester
  def initialize blk
    @blk = blk
    @timeout = EM::Timer.new(2){ close_connection }
  end
  def connection_completed
    @blk.call(true) if @blk
    @blk = nil
    @timeout.cancel
    close_connection
  end
  def unbind
    @blk.call(false) if @blk
    @blk = nil
  end
  def self.test ip, port, &blk
    EM.connect ip, port, self, blk
  end
end
 
EM.run{
  PortTester.test('google.com', 80) do |open|
    p open
  end
}