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scout_apm

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ScoutAPM agent for Phoenix & Elixir projects. For more information, visit https://www.scoutapm.com/agents/elixir-phoenix-monitoring.

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scout_apm lib scout_apm config.ex
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lib/scout_apm/config.ex 

defmodule ScoutApm.Config do

  @moduledoc """

  Public interface to configuration settings. Reads from several configuration

  sources, giving each an opportunity to respond with its value before trying

  the next.



  Application.get_env, and Defaults are the the current ones, with

  an always-nil at the end of the chain.

  """



  alias ScoutApm.Config.Coercions



  @config_modules [

    {ScoutApm.Config.Env, ScoutApm.Config.Env.load()},

    {ScoutApm.Config.Application, ScoutApm.Config.Application.load()},

    {ScoutApm.Config.Defaults, ScoutApm.Config.Defaults.load()},

    {ScoutApm.Config.Null, ScoutApm.Config.Null.load()},

  ]



  def find(key) do

    Enum.reduce_while(@config_modules, nil, fn {mod, data}, _acc ->

      if mod.contains?(data, key) do

        raw = mod.lookup(data, key)

        case coercion(key).(raw) do

          {:ok, c} ->

            {:halt, c}

          :error ->

            ScoutApm.Logger.log(:info, "Coercion of configuration #{key} failed. Ignoring")

            {:cont, nil}

        end

    else

      {:cont, nil}

      end

    end)

  end



  defp coercion(:monitor), do: &Coercions.boolean/1

  defp coercion(:ignore), do: &Coercions.json/1

  defp coercion(_), do: fn x -> {:ok, x} end

end