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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 a binary file encoding a set of boards.

  Re-creates the set and converts it to a list.

  """



  use PersistConfig



  alias Islands.Board.Cache.Log

  alias Islands.Board



  @boards Application.get_env(@app, :default_boards).()

  @path Application.get_env(@app, :board_set_path)



  @doc """

  Reads a binary file encoding a set of boards.

  Re-creates the set and converts it to a list.

  """

  @dialyzer {:nowarn_function, read_boards: 0}

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

  def read_boards do

    try do

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

           %MapSet{} = set <- :erlang.binary_to_term(binary),

           [_ | _] = boards <- MapSet.to_list(set) do

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

        boards

      else

        {:error, reason} ->

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

          @boards



        [] ->

          :ok = Log.warn(:empty_list, {@path, @boards})

          @boards

      end

    rescue

      ArgumentError ->

        :ok = Log.warn(:invalid_binary, {@path, @boards})

        @boards



      WithClauseError ->

        :ok = Log.warn(:binary_not_a_set, {@path, @boards})

        @boards



      exception ->

        :ok = Log.warn(:exception, {@path, exception, @boards})

        @boards

    end

  end

end