module Dokken::Helpers

def port_open?(ip, port)
  begin
    Timeout.timeout(1) do
      s = TCPSocket.new(ip, port)
      s.close
      return true
    rescue Errno::ECONNREFUSED, Errno::EHOSTUNREACH, Errno::ENETUNREACH, Errno::ENETDOWN
      return false
    end
  rescue Timeout::Error
  end
  false
end