iterate over local network interfaces and find first non local ip4v address

get_ip4_address.ex

def get_ipv4_address() do
  :inet.getifaddrs()
  |> elem(1)
  |> Enum.find(fn {_interface, attr} ->
    case attr |> Keyword.get_values(:addr) do
      [] -> false
      list -> list |> Enum.find(fn(addr) ->
        case addr do
          nil -> false
          {127, 0, 0, 1} -> false
          {_, _, _, _, _, _, _, _} -> false
          {_, _, _, _} -> true
        end
      end)
    end
  end)
  |> elem(1)
  |> Keyword.fetch(:addr)
  |> elem(1)
end