Method assert_online_or_err

rust/src/lib.rs:1151–1156

(&self, message: &str)

    }

    fn assert_online_or_err(&self, message: &str) -> Result<(), Error> {
        if self.is_offline() {
            return Err(anyhow!(format_one_arg(message, self.get_driver_name())));
        }
        Ok(())
    }

    fn get_driver_name_with_extension(&self) -> String {
        format!(