sag_config/
sag_config_rust_config_lib_source.rs

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1use fidl::unpersist;
2use fidl_cf_sc_internal_sagconfig::Config as FidlConfig;
3use fuchsia_inspect::Node;
4use fuchsia_runtime::{take_startup_handle, HandleInfo, HandleType};
5#[derive(Debug)]
6pub struct Config {
7    pub use_suspender: bool,
8    pub wait_for_suspending_token: bool,
9}
10impl Config {
11    pub fn take_from_startup_handle() -> Self {
12        let config_vmo: zx::Vmo =
13            take_startup_handle(HandleInfo::new(HandleType::ComponentConfigVmo, 0))
14                .expect("Config VMO handle must be provided and cannot already have been taken.")
15                .into();
16        let config_size =
17            config_vmo.get_content_size().expect("must be able to read config vmo content size");
18        assert_ne!(config_size, 0, "config vmo must be non-empty");
19        let config_bytes =
20            config_vmo.read_to_vec(0, config_size).expect("must be able to read config vmo");
21        let checksum_length = u16::from_le_bytes([config_bytes[0], config_bytes[1]]) as usize;
22        let fidl_start = 2 + checksum_length;
23        let observed_checksum = &config_bytes[2..fidl_start];
24        let expected_checksum = vec![
25            0x3f, 0x34, 0x4e, 0xf5, 0x31, 0xc9, 0xd4, 0x08, 0x2d, 0x68, 0x87, 0xc8, 0xae, 0xc3,
26            0x2c, 0x15, 0xc1, 0x29, 0x1d, 0xe7, 0x5a, 0x47, 0x0b, 0xa2, 0x8b, 0x91, 0xb5, 0x6e,
27            0x71, 0xde, 0xad, 0xb9,
28        ];
29        assert_eq!(
30            observed_checksum, expected_checksum,
31            "checksum from config VMO does not match expected checksum"
32        );
33        let fidl_config: FidlConfig = unpersist(&config_bytes[fidl_start..])
34            .expect("must be able to parse bytes as config FIDL");
35        Self {
36            use_suspender: fidl_config.use_suspender,
37            wait_for_suspending_token: fidl_config.wait_for_suspending_token,
38        }
39    }
40    pub fn record_inspect(&self, inspector_node: &Node) {
41        inspector_node.record_bool("use_suspender", self.use_suspender);
42        inspector_node.record_bool("wait_for_suspending_token", self.wait_for_suspending_token);
43    }
44}
sag_config/sag_config_rust_config_lib_source.rs

sag_config/
sag_config_rust_config_lib_source.rs
