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grains

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A framework to implement process data flows using declarative flow graphs.

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grains lib grains support transformer.ex
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lib/grains/support/transformer.ex 

defmodule Grains.Support.Transformer do

  @moduledoc """

  A grain to transform messages and push them further along.

  """



  use Grains.GenGrain



  defmodule State do

    @enforce_keys [:transform]



    defstruct @enforce_keys

  end



  @impl true

  def init(args) do

    {:ok, struct!(State, args)}

  end



  @impl true

  def handle_push(msg, _from, state) do

    msg

    |> state.transform.()

    |> push()



    {:noreply, state}

  end



  @impl true

  def handle_pull(_, state) do

    pull()



    {:noreply, state}

  end



  @impl true

  def handle_pull(_, tag, state) do

    pull_with_tag(tag)



    {:noreply, state}

  end

end