em-chef-client.rb

require 'eventmachine'
require 'chef'
require 'chef/application/client'

class EM::ChefClient
  include EM::Deferrable

  def initialize
    @client = Chef::Application::Client.new
  end

  def run_client
    @client.run
  end
end

module NoahChefClient
  def post_init
    puts "-- INCOMING!!!!"
    @client = EM::ChefClient.new
  end

  def receive_data(data)
    send_data "Starting a Chef Client Run\n"
    @client.callback {
      puts "Work's done...."
    }
    Thread.new {
      @client.run_client
    }
    close_connection_after_writing
  end

  def unbind
    puts "-- Disconnected"
  end
end

EM.run do
  at_exit { EM.run { puts "Restarting server...."; EM::start_server "127.0.0.1", 9090, NoahChefClient } }
  puts "Starting up Chef Client. Ping me on port 9090"
  EM::start_server "127.0.0.1", 9090, NoahChefClient
end