func setupFileConfigdumpWriter(filename string, out io.Writer) (*configdump.ConfigWriter, error) {
	data, err := readFile(filename)
	if err != nil {
		return nil, err
	}
	return setupConfigdumpEnvoyConfigWriter(data, out)
}

func setupConfigdumpEnvoyConfigWriter(debug []byte, out io.Writer) (*configdump.ConfigWriter, error) {
	cw := &configdump.ConfigWriter{Stdout: out}
	err := cw.Prime(debug)
	if err != nil {
		return nil, err
	}