over_there/utils/
exec.rs

1use derive_more::{Display, Error};
2use std::time::{Duration, SystemTime, SystemTimeError};
3
4#[derive(Debug, Display, Error)]
5pub enum Error {
6    Exec(#[error(ignore)] Box<dyn std::error::Error>),
7    SystemTime(SystemTimeError),
8    #[display(fmt = "{:?}", _0)]
9    Timeout(#[error(ignore)] Duration),
10}
11
12/// Invokes a function repeatedly until it yields Some(T); if a timeout is reached,
13/// the function will return an error
14pub fn loop_timeout<T>(
15    timeout: Duration,
16    mut f: impl FnMut() -> Result<Option<T>, Box<dyn std::error::Error>>,
17) -> Result<T, Error> {
18    let start_time = SystemTime::now();
19    let mut result = None;
20    while SystemTime::now()
21        .duration_since(start_time)
22        .map_err(Error::SystemTime)?
23        < timeout
24        && result.is_none()
25    {
26        result = f().map_err(Error::Exec)?;
27    }
28
29    result.ok_or(Error::Timeout(timeout))
30}
31
32/// Invokes a function repeatedly until it yields true; if a timeout is
33/// reached, the function will panic
34pub fn loop_timeout_panic<T>(
35    timeout: Duration,
36    mut f: impl FnMut() -> Option<T>,
37) -> T {
38    loop_timeout(timeout, || Ok(f())).unwrap()
39}
over_there/utils/exec.rs

over_there/utils/
exec.rs
