ha-handler/lib/ha_handler.ex

defmodule HAHandler do
  @moduledoc """
  This top-level module only contains generic configuration helpers.
  """

  # Mix is not available in releases, and these things are static
  # anyway (@variables are evaluated at compile time).
  @otp_app Mix.Project.config()[:app]
  @version Mix.Project.config[:version]
  @env Mix.env

  def http_port, do: Application.get_env(@otp_app, :http_port)
  def haproxy_socket, do: Application.get_env(@otp_app, :haproxy_socket)
  def acme_challenge_path, do: Application.get_env(@otp_app, :acme_challenge_path)
  def static_path(), do: Application.app_dir(@otp_app, "priv/static/")

  def otp_app(), do: @otp_app
  def version(), do: @version
  def env(), do: @env
end