mod.ex

defmodule ChocolateMachine do
  defrecordp :state, [:sock, :state, :and_so_on]
  def start_link
    # starts tcp server and saves sock to state
  end
  
  def handle_call({:get_chocolate, chocola_name}, from, state(state: :processing, sock: sock))
    case :gen_tcp.send(sock, chocolate_name) do
      :ok -> :ok
      :error -> raise("Gimme chocolate pls")
    end
    
    {:reply, :ok, state}
  end
  
  def handle_info({:tcp, :processed}, state = s)
    { :noreply, state(s, state: :processed }
  end

  def get(pid, chocolate_name)
    :gen_server.call(pid, {:get_chocolate, chocolate_name}}) do
      :ok -> :ok # How do I get state of the current chocolate?
    end
  end
end

{:ok, pid} = ChocolateMachine.start_link()
ChocolateMachine.get(pid, "hershey's")
# What if the chocolate machine takes 10 seconds to get the chocolate with the :processed state and gives me back the chocolate while it's still processing?