elixir connecting nodes

elixir-connect-nodes.ex

# iex --sname b1 --cookie monster -S mix
# iex --sname b2 --cookie monster -S mix
# Node.connect(:"b1@localhost")
# http://www.brianstorti.com/getting-started-with-plug-elixir/

defmodule HelloPlug.Worker do
    use GenServer

    def start_link do
        Plug.Adapters.Cowboy.http(MyPipeline, %{})
        GenServer.start_link(__MODULE__, [], name: :worker)
    end
end



defmodule MyPipeline do
  # We use Plug.Builder to have access to the plug/2 macro.
  # This macro can receive a function or a module plug and an
  # optional parameter that will be passed unchanged to the
  # given plug.
  use Plug.Builder

  plug Plug.Logger
  plug :extract_name
  plug :greet, %{my_option: "Hello"}

  def extract_name(%Plug.Conn{request_path: "/" <> name} = conn, opts) do
    assign(conn, :name, name)
  end

  def greet(conn, opts) do
    msg = HelloPlug.Bot.get_messages
    conn
    |> send_resp(200, "#{opts[:my_option]}, #{msg}")
  end
end

defmodule HelloPlug.Bot do
    use GenServer

    def start_link do
        GenServer.start_link(__MODULE__, 123, name: {:global, "bot"})
    end

    defp via_tuple(room_name) do
        {:via, :gproc, {:n, :g, {:chat_room, room_name}}}
    end

    # Client
    def get_messages do
        GenServer.call(:global.whereis_name("bot"), :get_messages)
    end


    # Server
    def handle_call(:get_messages, _from, state) do
        {:reply, state, state}
    end
end