allow for dynamic configuration via an init/1 Config callback

[peburrows]

To use:

config :goth, config_module: MyGothConfig

defmodule MyGothConfig
  use Goth.Config

  def init(config) do
    {:ok, Keyword.put(config, :json, load_json_from_somewhere())}
  end
end

[rjacobskind]

@peburrows When developing locally, I notice that this line always fails: https://github.com/peburrows/goth/blob/df400832bd614cb14a606ba42c4d5b9f15394072/lib/goth/config.ex#L113

So, my custom config module is never actually run. I haven't been able to get my goth config working properly because of this. Any possible fix in mind?

Edit: In further investigating, I discovered that Code.ensure_loaded(mod) (non-boolean response) returns {:error, :nofile}. My config module does exist though.

[peburrows]

Strange. What do your module and your config look like? If nothing jumps out as wrong in your module or the config, the simplest reproducible example would help me to debug this.

[rjacobskind]

I am storing the credentials as base64 and then decoding them into the json format.

This is what my config looks like:

config :goth, config_module: MyApp.GothConfig

And this is what my config module looks like:

defmodule MyApp.GothConfig do
  use Goth.Config

  def init(config) do
    credentials =
      (Application.get_env(:my_app, :credentials) ||
         System.get_env("GOOGLE_APPLICATION_CREDENTIALS"))
      |> Base.decode64()
      |> elem(1)

    {:ok, Keyword.put(config, :json, credentials)}
  end
end

[peburrows]

Hrm, that all looks fine. What does your mix.exs file look like, and are you able to reproduce this in a bare project with Goth as the only dependency?

[rjacobskind]

Upon further investigation, I found that the issue was caused by my config file living in the config directory, so it wasn't getting compiled. I fixed this and now Goth is able to find my module

[peburrows]

Awesome, glad you were able to figure it out!