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Wechat API wrapper in Elixir.

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wechat lib wechat workers access_token.ex
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lib/wechat/workers/access_token.ex 

defmodule Wechat.Workers.AccessToken do

  @moduledoc false



  use GenServer



  alias Wechat.API



  @name __MODULE__

  @default_refresh_interval :timer.minutes(30)

  @default_fetcher {API, :access_token, []}



  def start_link(args) do

    GenServer.start_link(__MODULE__, args, name: @name)

  end



  def init(_) do

    state = do_refresh()

    {:ok, state}

  end



  def handle_call(:get, _from, state) do

    {:reply, state["access_token"], state}

  end



  def handle_info(:refresh, _state) do

    state = do_refresh()

    {:noreply, state}

  end



  defp do_refresh do

    Process.send_after(self(), :refresh, refresh_interval())



    {mod, f, args} = env(:access_token_fetcher, @default_fetcher)

    apply(mod, f, args)

  end



  def refresh_interval do

    env(:access_token_refresh_interval, @default_refresh_interval)

  end



  defp env(key, default) do

    :wechat

    |> Application.get_env(Wechat)

    |> Keyword.get(key, default)

  end



  def get do

    GenServer.call(@name, :get)

  end

end