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

defmodule FunWithFlags.Store.Persistent do

  @moduledoc false



  alias FunWithFlags.{Config, Notifications}



  @conn __MODULE__

  @conn_options [name: @conn, sync_connect: false]

  @prefix "fun_with_flags:"





  def worker_spec do

    import Supervisor.Spec, only: [worker: 3]

    worker(Redix, [Config.redis_config, @conn_options], [restart: :permanent])

  end





  def get(flag_name) do

    case Redix.command(@conn, ["GET", format(flag_name)]) do

      {:ok, "true"}  -> true

      {:ok, "false"} -> false

      {:error, why}  -> {:error, redis_error(why)}

      _              -> false

    end

  end





  def put(flag_name, value) do

    case Redix.command(@conn, ["SET", format(flag_name), value]) do

      {:ok, "OK"} ->

        publish_change(flag_name)

        {:ok, value}

      {:error, why} -> {:error, redis_error(why)}

    end

  end





  def publish_change(flag_name) do

    if Config.cache? do

      Task.start fn() ->

        Redix.command(@conn, ["PUBLISH" | Notifications.payload_for(flag_name)])

      end

    end

  end





  defp format(flag_name) do

    @prefix <> to_string(flag_name)

  end



  defp redis_error(reason_atom) do

    "Redis Error: #{reason_atom}"

  end



end