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use std::ops::{Bound, RangeBounds};
use std::time;
pub struct TimerangeBound<T> {
obj: T,
start: Option<time::SystemTime>,
end: Option<time::SystemTime>,
}
fn unwrap_bound(b: Bound<&'_ time::SystemTime>) -> Option<time::SystemTime> {
match b {
Bound::Included(x) => Some(*x),
Bound::Excluded(x) => Some(*x),
_ => None,
}
}
impl<T> TimerangeBound<T> {
pub fn new<U>(obj: T, range: U) -> Self
where
U: RangeBounds<time::SystemTime>,
{
let start = unwrap_bound(range.start_bound());
let end = unwrap_bound(range.end_bound());
Self { obj, start, end }
}
pub fn extend_tolerance(self, d: time::Duration) -> Self {
let end = self.end.map(|t| t + d);
Self { end, ..self }
}
pub fn extend_pre_tolerance(self, d: time::Duration) -> Self {
let start = self.start.map(|t| t - d);
Self { start, ..self }
}
}
impl<T> crate::Timebound<T> for TimerangeBound<T> {
type Error = crate::TimeValidityError;
fn is_valid_at(&self, t: &time::SystemTime) -> Result<(), Self::Error> {
use crate::TimeValidityError;
if let Some(start) = self.start {
if let Ok(d) = start.duration_since(*t) {
return Err(TimeValidityError::NotYetValid(d));
}
}
if let Some(end) = self.end {
if let Ok(d) = t.duration_since(end) {
return Err(TimeValidityError::Expired(d));
}
}
Ok(())
}
fn dangerously_assume_timely(self) -> T {
self.obj
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::{TimeValidityError, Timebound};
use std::time::{Duration, SystemTime};
#[test]
fn test_bounds() {
let one_day = Duration::new(86400, 0);
let mixminion_v0_0_1 = SystemTime::UNIX_EPOCH + 12059 * one_day;
let tor_v0_0_2pre13 = SystemTime::UNIX_EPOCH + 12344 * one_day;
let cussed_nougat = SystemTime::UNIX_EPOCH + 14093 * one_day;
let tor_v0_4_4_5 = SystemTime::UNIX_EPOCH + 18520 * one_day;
let today = SystemTime::UNIX_EPOCH + 18527 * one_day;
let tr = TimerangeBound::new((), ..tor_v0_4_4_5);
assert_eq!(tr.start, None);
assert_eq!(tr.end, Some(tor_v0_4_4_5));
assert!(tr.is_valid_at(&mixminion_v0_0_1).is_ok());
assert!(tr.is_valid_at(&tor_v0_0_2pre13).is_ok());
assert_eq!(
tr.is_valid_at(&today),
Err(TimeValidityError::Expired(7 * one_day))
);
let tr = TimerangeBound::new((), tor_v0_0_2pre13..=tor_v0_4_4_5);
assert_eq!(tr.start, Some(tor_v0_0_2pre13));
assert_eq!(tr.end, Some(tor_v0_4_4_5));
assert_eq!(
tr.is_valid_at(&mixminion_v0_0_1),
Err(TimeValidityError::NotYetValid(285 * one_day))
);
assert!(tr.is_valid_at(&cussed_nougat).is_ok());
assert_eq!(
tr.is_valid_at(&today),
Err(TimeValidityError::Expired(7 * one_day))
);
let tr = tr
.extend_pre_tolerance(5 * one_day)
.extend_tolerance(2 * one_day);
assert_eq!(tr.start, Some(tor_v0_0_2pre13 - 5 * one_day));
assert_eq!(tr.end, Some(tor_v0_4_4_5 + 2 * one_day));
let tr = TimerangeBound::new((), tor_v0_4_4_5..);
assert_eq!(tr.start, Some(tor_v0_4_4_5));
assert_eq!(tr.end, None);
assert_eq!(
tr.is_valid_at(&cussed_nougat),
Err(TimeValidityError::NotYetValid(4427 * one_day))
);
assert!(tr.is_valid_at(&today).is_ok());
}
#[test]
fn test_checking() {
let one_day = Duration::new(86400, 0);
let de = SystemTime::UNIX_EPOCH + one_day * 7580;
let cz_sk = SystemTime::UNIX_EPOCH + one_day * 8401;
let eu = SystemTime::UNIX_EPOCH + one_day * 8705;
let za = SystemTime::UNIX_EPOCH + one_day * 8882;
let tr = TimerangeBound::new("Hello world", cz_sk..eu);
assert!(tr.check_valid_at(&za).is_err());
let tr = TimerangeBound::new("Hello world", cz_sk..za);
assert_eq!(tr.check_valid_at(&eu), Ok("Hello world"));
let tr = TimerangeBound::new("hello world", de..);
assert_eq!(tr.check_valid_now(), Ok("hello world"));
let tr = TimerangeBound::new("hello world", ..za);
assert!(tr.check_valid_now().is_err());
}
}