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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 writer.ex
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lib/islands/board/cache/writer.ex 

defmodule Islands.Board.Cache.Writer do

  @moduledoc """

  Persists a given board to the configured external source.

  """



  use PersistConfig



  alias Islands.Board.Cache.Log

  alias Islands.Board



  @path get_env(:board_set_path)



  @doc """

  Persists `board` to the configured external source.

  """

  @spec persist(Board.t()) :: :ok

  def persist(board) do

    binary =

      case File.read(@path) do

        {:ok, binary} ->

          :erlang.binary_to_term(binary)



        {:error, reason} ->

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

          MapSet.new()

      end

      |> MapSet.put(board)

      |> :erlang.term_to_binary()



    case File.write(@path, binary) do

      :ok ->

        :ok = Log.info(:board_persisted, {@path, board})



      {:error, reason} ->

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

    end

  end

end