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islands_board_cache

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Board Cache for the Game of Islands. Returns a random board.

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islands_board_cache lib islands board cache loader.ex
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lib/islands/board/cache/loader.ex 

defmodule Islands.Board.Cache.Loader do

  @moduledoc """

  Reads the configured external file encoding a set of boards.

  Re-creates the set and turns it into a list of boards.

  """



  use PersistConfig



  alias Islands.Board.Cache.Log

  alias Islands.Board



  @boards get_env(:default_boards)

  @path get_env(:board_set_path)



  @doc """

  Reads the configured external file encoding a set of boards.

  Re-creates the set and turns it into a list of boards.

  """

  @spec read_boards :: [Board.t()]

  def read_boards do

    with {:ok, binary} <- File.read(@path),

         [_ | _] = boards <-

           :erlang.binary_to_term(binary) |> MapSet.to_list() do

      :ok = Log.info(:boards_read, {@path, boards, __ENV__})

      boards

    else

      {:error, reason} ->

        :ok = Log.error(:read_error, {@path, reason, @boards, __ENV__})

        @boards



      [] ->

        :ok = Log.error(:empty_set, {@path, @boards, __ENV__})

        @boards

    end

  end

end