cache_manager_config_lib/
cache_manager_config_lib_rust_config_lib_source.rs

1use fidl::unpersist;
2use fidl_cf_sc_internal_cachemanagerconfiglib::Config as FidlConfig;
3use fuchsia_component_config::{Config as ComponentConfig, Error};
4use fuchsia_inspect::Node;
5use std::convert::TryInto;
6const EXPECTED_CHECKSUM: &[u8] = &[
7    0xee, 0xc7, 0xc3, 0x22, 0xf2, 0xb0, 0x79, 0x6d, 0x7d, 0x07, 0x77, 0x52, 0x8f, 0x01, 0x54, 0xa2,
8    0xaa, 0x69, 0xe1, 0xa9, 0xf1, 0xb7, 0x80, 0xc0, 0xfe, 0x0a, 0xca, 0x3e, 0xd8, 0xfc, 0x25, 0xd8,
9];
10const EXPECTED_CHECKSUM_LENGTH: [u8; 2] = (EXPECTED_CHECKSUM.len() as u16).to_le_bytes();
11#[derive(Debug)]
12pub struct Config {
13    pub cache_clearing_threshold: u64,
14    pub storage_checking_frequency: u64,
15}
16impl Config {
17    #[doc = r" Take the config startup handle and parse its contents."]
18    #[doc = r""]
19    #[doc = r" # Panics"]
20    #[doc = r""]
21    #[doc = r" If the config startup handle was already taken or if it is not valid."]
22    pub fn take_from_startup_handle() -> Self {
23        <Self as ComponentConfig>::take_from_startup_handle()
24    }
25    #[doc = r" Parse `Self` from `vmo`."]
26    pub fn from_vmo(vmo: &zx::Vmo) -> Result<Self, Error> {
27        <Self as ComponentConfig>::from_vmo(vmo)
28    }
29    #[doc = r" Parse `Self` from `bytes`."]
30    pub fn from_bytes(bytes: &[u8]) -> Result<Self, Error> {
31        <Self as ComponentConfig>::from_bytes(bytes)
32    }
33    pub fn record_inspect(&self, inspector_node: &Node) {
34        <Self as ComponentConfig>::record_inspect(self, inspector_node)
35    }
36}
37impl ComponentConfig for Config {
38    #[doc = r" Parse `Self` from `bytes`."]
39    fn from_bytes(bytes: &[u8]) -> Result<Self, Error> {
40        let (checksum_len_bytes, bytes) = bytes.split_at_checked(2).ok_or(Error::TooFewBytes)?;
41        let checksum_len_bytes: [u8; 2] =
42            checksum_len_bytes.try_into().expect("previous call guaranteed 2 element slice");
43        let checksum_length = u16::from_le_bytes(checksum_len_bytes) as usize;
44        let (observed_checksum, bytes) =
45            bytes.split_at_checked(checksum_length).ok_or(Error::TooFewBytes)?;
46        if observed_checksum != EXPECTED_CHECKSUM {
47            return Err(Error::ChecksumMismatch {
48                expected_checksum: EXPECTED_CHECKSUM.to_vec(),
49                observed_checksum: observed_checksum.to_vec(),
50            });
51        }
52        let fidl_config: FidlConfig = unpersist(bytes).map_err(Error::Unpersist)?;
53        Ok(Self {
54            cache_clearing_threshold: fidl_config.cache_clearing_threshold,
55            storage_checking_frequency: fidl_config.storage_checking_frequency,
56        })
57    }
58    fn to_bytes(&self) -> Result<Vec<u8>, Error> {
59        let fidl_config = FidlConfig {
60            cache_clearing_threshold: self.cache_clearing_threshold.clone(),
61            storage_checking_frequency: self.storage_checking_frequency.clone(),
62        };
63        let mut fidl_bytes = fidl::persist(&fidl_config).map_err(Error::Persist)?;
64        let mut bytes = Vec::with_capacity(
65            EXPECTED_CHECKSUM_LENGTH.len() + EXPECTED_CHECKSUM.len() + fidl_bytes.len(),
66        );
67        bytes.extend_from_slice(&EXPECTED_CHECKSUM_LENGTH);
68        bytes.extend_from_slice(EXPECTED_CHECKSUM);
69        bytes.append(&mut fidl_bytes);
70        Ok(bytes)
71    }
72    fn record_inspect(&self, inspector_node: &Node) {
73        inspector_node.record_uint("cache_clearing_threshold", self.cache_clearing_threshold);
74        inspector_node.record_uint("storage_checking_frequency", self.storage_checking_frequency);
75    }
76}
cache_manager_config_lib/cache_manager_config_lib_rust_config_lib_source.rs

cache_manager_config_lib/
cache_manager_config_lib_rust_config_lib_source.rs
