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#![forbid(unsafe_op_in_unsafe_fn)]
use crate::time::Duration;
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
pub struct Instant(Duration);
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Debug, Hash)]
pub struct SystemTime(Duration);
pub const UNIX_EPOCH: SystemTime = SystemTime(Duration::from_secs(0));
fn current_time(clock: wasi::Clockid) -> Duration {
let ts = unsafe {
wasi::clock_time_get(
clock, 1, // precision... seems ignored though?
)
.unwrap()
};
Duration::new((ts / 1_000_000_000) as u64, (ts % 1_000_000_000) as u32)
}
impl Instant {
pub fn now() -> Instant {
Instant(current_time(wasi::CLOCKID_MONOTONIC))
}
pub fn checked_sub_instant(&self, other: &Instant) -> Option<Duration> {
self.0.checked_sub(other.0)
}
pub fn checked_add_duration(&self, other: &Duration) -> Option<Instant> {
Some(Instant(self.0.checked_add(*other)?))
}
pub fn checked_sub_duration(&self, other: &Duration) -> Option<Instant> {
Some(Instant(self.0.checked_sub(*other)?))
}
}
impl SystemTime {
pub fn now() -> SystemTime {
SystemTime(current_time(wasi::CLOCKID_REALTIME))
}
#[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
pub const fn from_wasi_timestamp(ts: wasi::Timestamp) -> SystemTime {
SystemTime(Duration::from_nanos(ts))
}
#[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
pub const fn to_wasi_timestamp(&self) -> Option<wasi::Timestamp> {
// FIXME: const TryInto
let ns = self.0.as_nanos();
if ns <= u64::MAX as u128 { Some(ns as u64) } else { None }
}
#[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
pub const fn sub_time(&self, other: &SystemTime) -> Result<Duration, Duration> {
// FIXME: ok_or_else with const closures
match self.0.checked_sub(other.0) {
Some(duration) => Ok(duration),
None => Err(other.0 - self.0),
}
}
#[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
pub const fn checked_add_duration(&self, other: &Duration) -> Option<SystemTime> {
Some(SystemTime(self.0.checked_add(*other)?))
}
#[rustc_const_unstable(feature = "const_system_time", issue = "144517")]
pub const fn checked_sub_duration(&self, other: &Duration) -> Option<SystemTime> {
Some(SystemTime(self.0.checked_sub(*other)?))
}
}
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