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reactor_file

0.14.0
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A Reactor extension which provides steps for working with the filesystem.

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reactor_file lib reactor file middleware.ex
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lib/reactor/file/middleware.ex 

defmodule Reactor.File.Middleware do

  @moduledoc """

  A Reactor middleware which provides a temporary storage space for files during

  undo operations.

  """

  use Reactor.Middleware



  @doc false

  @impl true

  def init(context) do

    chunk =

      {Node.self(), System.pid(), self()}

      |> :erlang.phash2()

      |> Integer.to_string(16)



    tmp_dir =

      System.tmp_dir!()

      |> Path.join(chunk)



    with :ok <- File.mkdir(tmp_dir) do

      {:ok, Map.put(context, __MODULE__, %{tmp_dir: tmp_dir})}

    end

  end



  @doc false

  @impl true

  def complete(result, %{__MODULE__ => %{tmp_dir: tmp_dir}}) do

    File.rm_rf!(tmp_dir)



    {:ok, result}

  end



  @doc false

  @impl true

  def error(_errors, %{__MODULE__ => %{tmp_dir: tmp_dir}}) do

    File.rm_rf!(tmp_dir)



    :ok

  end

end