element_config/
element_config_rust_config_lib_source.rs

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1use fidl::unpersist;
2use fidl_cf_sc_internal_elementconfig::Config as FidlConfig;
3use fuchsia_inspect::{ArrayProperty, Node};
4use fuchsia_runtime::{take_startup_handle, HandleInfo, HandleType};
5#[derive(Debug)]
6pub struct Config {
7    pub default_collection: String,
8    pub url_to_collection: Vec<String>,
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            0x3e, 0x91, 0x4b, 0x07, 0x29, 0x7e, 0xb9, 0xa0, 0xd5, 0x82, 0xd9, 0x56, 0xd5, 0x7f,
26            0x8b, 0x09, 0x59, 0xa1, 0x96, 0x43, 0xca, 0x29, 0xfa, 0x1e, 0xfa, 0x55, 0x19, 0x79,
27            0xdc, 0x4b, 0x57, 0x00,
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            default_collection: fidl_config.default_collection,
37            url_to_collection: fidl_config.url_to_collection,
38        }
39    }
40    pub fn record_inspect(&self, inspector_node: &Node) {
41        inspector_node.record_string("default_collection", &self.default_collection);
42        let arr =
43            inspector_node.create_string_array("url_to_collection", self.url_to_collection.len());
44        for i in 0..self.url_to_collection.len() {
45            arr.set(i, &self.url_to_collection[i]);
46        }
47        inspector_node.record(arr);
48    }
49}
element_config/element_config_rust_config_lib_source.rs

element_config/
element_config_rust_config_lib_source.rs
