Blackhole server that accepts connections but never responds.

blackhole.rb

require 'eventmachine'

 module Blackhole
   def post_init
     puts "CONNECT"
   end

   def receive_data data
     puts "RECEIVE: #{data}"
   end

   def unbind
     puts "DISCONNECT"
  end
end

# Note that this will block current thread.
EventMachine.run {
  port = ENV['PORT'] || 9000
  puts "Starting server on port #{port}"
  EventMachine.start_server "127.0.0.1", port, Blackhole
}