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fun_with_flags

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FunWithFlags, a flexible and fast feature toggle library for Elixir.

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fun_with_flags lib fun_with_flags store.ex
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lib/fun_with_flags/store.ex 

defmodule FunWithFlags.Store do

  @moduledoc false



  alias FunWithFlags.Store.{Cache, Persistent}





  def lookup(flag_name) do

    case Cache.get(flag_name) do

      {:ok, flag} ->

        {:ok, flag}

      {:miss, reason, stale_value_or_nil} ->

        case Persistent.get(flag_name) do

          {:ok, flag} ->

            Cache.put(flag) 

            {:ok, flag}

          {:error, _reason} ->

            try_to_use_the_cached_value(reason, stale_value_or_nil)

        end

    end

  end





  defp try_to_use_the_cached_value(:expired, value) do

    {:ok, value}

  end

  defp try_to_use_the_cached_value(_, _) do

    raise "Can't load feature flag"

  end





  def put(flag_name, gate) do

    case Persistent.put(flag_name, gate) do

      {:ok, flag} ->

        Cache.put(flag)

      {:error, _reason} = error ->

        error

    end

  end





  def reload(flag_name) do

    # IO.puts "reloading #{flag_name}"

    case Persistent.get(flag_name) do

      {:ok, flag} ->

        Cache.put(flag)

      {:error, _reason} = error ->

        error

    end

  end

end