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use super::MAX_SAFE_MILLIS_DURATION;
use crate::time::{Clock, Duration, Instant};
/// A structure which handles conversion from Instants to `u64` timestamps.
#[derive(Debug)]
pub(crate) struct TimeSource {
start_time: Instant,
}
impl TimeSource {
pub(crate) fn new(clock: &Clock) -> Self {
Self {
start_time: clock.now(),
}
}
pub(crate) fn deadline_to_tick(&self, t: Instant) -> u64 {
// Round up to the end of a ms
self.instant_to_tick(t + Duration::from_nanos(999_999))
}
pub(crate) fn instant_to_tick(&self, t: Instant) -> u64 {
// round up
let dur: Duration = t.saturating_duration_since(self.start_time);
let ms = dur
.as_millis()
.try_into()
.unwrap_or(MAX_SAFE_MILLIS_DURATION);
ms.min(MAX_SAFE_MILLIS_DURATION)
}
pub(crate) fn tick_to_duration(&self, t: u64) -> Duration {
Duration::from_millis(t)
}
pub(crate) fn now(&self, clock: &Clock) -> u64 {
self.instant_to_tick(clock.now())
}
#[cfg(test)]
#[allow(dead_code)]
pub(super) fn start_time(&self) -> Instant {
self.start_time
}
}