power_manager_config_lib/
power-manager-config-lib_rust_config_lib_source.rs

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use fidl::unpersist;
use fidl_cf_sc_internal_powermanagerconfiglib::Config as FidlConfig;
use fuchsia_inspect::Node;
use fuchsia_runtime::{take_startup_handle, HandleInfo, HandleType};
#[derive(Debug)]
pub struct Config {
    pub disable_temperature_filter: bool,
    pub enable_debug_service: bool,
    pub node_config_path: String,
}
impl Config {
    pub fn take_from_startup_handle() -> Self {
        let config_vmo: zx::Vmo =
            take_startup_handle(HandleInfo::new(HandleType::ComponentConfigVmo, 0))
                .expect("Config VMO handle must be provided and cannot already have been taken.")
                .into();
        let config_size =
            config_vmo.get_content_size().expect("must be able to read config vmo content size");
        assert_ne!(config_size, 0, "config vmo must be non-empty");
        let config_bytes =
            config_vmo.read_to_vec(0, config_size).expect("must be able to read config vmo");
        let checksum_length = u16::from_le_bytes([config_bytes[0], config_bytes[1]]) as usize;
        let fidl_start = 2 + checksum_length;
        let observed_checksum = &config_bytes[2..fidl_start];
        let expected_checksum = vec![
            0x65, 0xe6, 0x1e, 0xa0, 0x5f, 0xd2, 0xf5, 0xf9, 0x67, 0x58, 0xac, 0xcd, 0xc1, 0x85,
            0x28, 0x7b, 0x13, 0x00, 0xaa, 0x9f, 0x12, 0x1d, 0xfd, 0xc0, 0x8a, 0x7e, 0x90, 0xc9,
            0x59, 0x3a, 0x46, 0x9f,
        ];
        assert_eq!(
            observed_checksum, expected_checksum,
            "checksum from config VMO does not match expected checksum"
        );
        let fidl_config: FidlConfig = unpersist(&config_bytes[fidl_start..])
            .expect("must be able to parse bytes as config FIDL");
        Self {
            disable_temperature_filter: fidl_config.disable_temperature_filter,
            enable_debug_service: fidl_config.enable_debug_service,
            node_config_path: fidl_config.node_config_path,
        }
    }
    pub fn record_inspect(&self, inspector_node: &Node) {
        inspector_node.record_bool("disable_temperature_filter", self.disable_temperature_filter);
        inspector_node.record_bool("enable_debug_service", self.enable_debug_service);
        inspector_node.record_string("node_config_path", &self.node_config_path);
    }
}