fn get_prev_modules()

in identity/aziot-identityd/src/identity.rs [1038:1075]

• 30 lines of code
• 4 McCabe index (conditional complexity)

fn get_prev_modules(
    prev_settings_path: &std::path::Path,
    prev_device_info_path: &std::path::Path,
    curr_hub_device_info: HubDeviceInfo,
) -> std::collections::BTreeSet<aziot_identity_common::ModuleId> {
    if !prev_settings_path.exists() || !prev_device_info_path.exists() {
        return Default::default();
    }

    let prev_hub_device_info = match HubDeviceInfo::new(prev_device_info_path) {
        Ok(device_info) => device_info,
        Err(err) => {
            log::warn!("Ignoring invalid device info backup: {}", err);

            return Default::default();
        }
    };

    // Only consider the previous Hub modules if the current and previous Hub devices match.
    if prev_hub_device_info != Some(curr_hub_device_info) {
        return Default::default();
    }

    let prev_settings =
        match crate::configext::load_file(prev_settings_path).map_err(Error::Internal) {
            Ok(settings) => settings,
            Err(err) => {
                log::warn!("Ignoring invalid device settings backup: {}", err);

                return Default::default();
            }
        };

    let (_, prev_hub_modules, _) =
        crate::configext::prepare_authorized_principals(&prev_settings.principal);

    prev_hub_modules
}