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Revert "protocols/gossipsub: Revert back to wasm_timer for interval (l…
…ibp2p#2506)" This reverts commit 60666f5.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,209 @@ | ||
| // Copyright 2021 Oliver Wangler <[email protected]> | ||
| // Copyright 2019 Pierre Krieger | ||
| // Copyright (c) 2019 Tokio Contributors | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a copy of | ||
| // this software and associated documentation files (the "Software"), to deal in | ||
| // the Software without restriction, including without limitation the rights to | ||
| // use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of | ||
| // the Software, and to permit persons to whom the Software is furnished to do so, | ||
| // subject to the following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included in all | ||
| // copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS | ||
| // FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS | ||
| // OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | ||
| // WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | ||
| // CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
| // | ||
| // Initial version copied from | ||
| // https://github.com/tomaka/wasm-timer/blob/8964804eff980dd3eb115b711c57e481ba541708/src/timer/interval.rs | ||
| // and adapted. | ||
| use std::{ | ||
| pin::Pin, | ||
| task::{Context, Poll}, | ||
| time::Duration, | ||
| }; | ||
|
|
||
| use futures::prelude::*; | ||
| use futures_timer::Delay; | ||
| use instant::Instant; | ||
| use pin_project::pin_project; | ||
|
|
||
| /// A stream representing notifications at fixed interval | ||
| /// | ||
| /// Intervals are created through the `Interval::new` or | ||
| /// `Interval::new_intial` methods indicating when a first notification | ||
| /// should be triggered and when it will be repeated. | ||
| /// | ||
| /// Note that intervals are not intended for high resolution timers, but rather | ||
| /// they will likely fire some granularity after the exact instant that they're | ||
| /// otherwise indicated to fire at. | ||
| #[pin_project] | ||
| #[derive(Debug)] | ||
| pub struct Interval { | ||
| #[pin] | ||
| delay: Delay, | ||
| interval: Duration, | ||
| fires_at: Instant, | ||
| } | ||
|
|
||
| impl Interval { | ||
| /// Creates a new interval which will fire at `dur` time into the future, | ||
| /// and will repeat every `dur` interval after | ||
| /// | ||
| /// The returned object will be bound to the default timer for this thread. | ||
| /// The default timer will be spun up in a helper thread on first use. | ||
| pub fn new(dur: Duration) -> Interval { | ||
| Interval::new_initial(dur, dur) | ||
| } | ||
|
|
||
| /// Creates a new interval which will fire the first time after the specified `initial_delay`, | ||
| /// and then will repeat every `dur` interval after. | ||
| /// | ||
| /// The returned object will be bound to the default timer for this thread. | ||
| /// The default timer will be spun up in a helper thread on first use. | ||
| pub fn new_initial(initial_delay: Duration, dur: Duration) -> Interval { | ||
| let fires_at = Instant::now() + initial_delay; | ||
| Interval { | ||
| delay: Delay::new(initial_delay), | ||
| interval: dur, | ||
| fires_at, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| impl Stream for Interval { | ||
| type Item = (); | ||
|
|
||
| fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> { | ||
| if self.as_mut().project().delay.poll(cx).is_pending() { | ||
| return Poll::Pending; | ||
| } | ||
| let next = next_interval(self.fires_at, Instant::now(), self.interval); | ||
| self.delay.reset(next); | ||
| self.fires_at += next; | ||
| Poll::Ready(Some(())) | ||
| } | ||
| } | ||
|
|
||
| /// Converts Duration object to raw nanoseconds if possible | ||
| /// | ||
| /// This is useful to divide intervals. | ||
| /// | ||
| /// While technically for large duration it's impossible to represent any | ||
| /// duration as nanoseconds, the largest duration we can represent is about | ||
| /// 427_000 years. Large enough for any interval we would use or calculate in | ||
| /// tokio. | ||
| fn duration_to_nanos(dur: Duration) -> Option<u64> { | ||
| let v = dur.as_secs().checked_mul(1_000_000_000)?; | ||
| v.checked_add(dur.subsec_nanos() as u64) | ||
| } | ||
|
|
||
| fn next_interval(prev: Instant, now: Instant, interval: Duration) -> Duration { | ||
| let new = prev + interval; | ||
| if new > now { | ||
| interval | ||
| } else { | ||
| let spent_ns = | ||
| duration_to_nanos(now.duration_since(prev)).expect("interval should be expired"); | ||
| let interval_ns = | ||
| duration_to_nanos(interval).expect("interval is less that 427 thousand years"); | ||
| let mult = spent_ns / interval_ns + 1; | ||
| assert!( | ||
| mult < (1 << 32), | ||
| "can't skip more than 4 billion intervals of {:?} \ | ||
| (trying to skip {})", | ||
| interval, | ||
| mult | ||
| ); | ||
| interval * mult as u32 | ||
| } | ||
| } | ||
|
|
||
| #[cfg(test)] | ||
| mod test { | ||
| use super::next_interval; | ||
| use std::time::{Duration, Instant}; | ||
|
|
||
| struct Timeline(Instant); | ||
|
|
||
| impl Timeline { | ||
| fn new() -> Timeline { | ||
| Timeline(Instant::now()) | ||
| } | ||
| fn at(&self, millis: u64) -> Instant { | ||
| self.0 + Duration::from_millis(millis) | ||
| } | ||
| fn at_ns(&self, sec: u64, nanos: u32) -> Instant { | ||
| self.0 + Duration::new(sec, nanos) | ||
| } | ||
| } | ||
|
|
||
| fn dur(millis: u64) -> Duration { | ||
| Duration::from_millis(millis) | ||
| } | ||
|
|
||
| // The math around Instant/Duration isn't 100% precise due to rounding | ||
| // errors | ||
| fn almost_eq(a: Instant, b: Instant) -> bool { | ||
| let diff = match a.cmp(&b) { | ||
| std::cmp::Ordering::Less => b - a, | ||
| std::cmp::Ordering::Equal => return true, | ||
| std::cmp::Ordering::Greater => a - b, | ||
| }; | ||
|
|
||
| diff < Duration::from_millis(1) | ||
| } | ||
|
|
||
| #[test] | ||
| fn norm_next() { | ||
| let tm = Timeline::new(); | ||
| assert!(almost_eq( | ||
| tm.at(1) + next_interval(tm.at(1), tm.at(2), dur(10)), | ||
| tm.at(11) | ||
| )); | ||
| assert!(almost_eq( | ||
| tm.at(7777) + next_interval(tm.at(7777), tm.at(7788), dur(100)), | ||
| tm.at(7877) | ||
| )); | ||
| assert!(almost_eq( | ||
| tm.at(1) + next_interval(tm.at(1), tm.at(1000), dur(2100)), | ||
| tm.at(2101) | ||
| )); | ||
| } | ||
|
|
||
| #[test] | ||
| fn fast_forward() { | ||
| let tm = Timeline::new(); | ||
|
|
||
| assert!(almost_eq( | ||
| tm.at(1) + next_interval(tm.at(1), tm.at(1000), dur(10)), | ||
| tm.at(1001) | ||
| )); | ||
| assert!(almost_eq( | ||
| tm.at(7777) + next_interval(tm.at(7777), tm.at(8888), dur(100)), | ||
| tm.at(8977) | ||
| )); | ||
| assert!(almost_eq( | ||
| tm.at(1) + next_interval(tm.at(1), tm.at(10000), dur(2100)), | ||
| tm.at(10501) | ||
| )); | ||
| } | ||
|
|
||
| /// TODO: this test actually should be successful, but since we can't | ||
| /// multiply Duration on anything larger than u32 easily we decided | ||
| /// to allow it to fail for now | ||
| #[test] | ||
| #[should_panic(expected = "can't skip more than 4 billion intervals")] | ||
| fn large_skip() { | ||
| let tm = Timeline::new(); | ||
| assert_eq!( | ||
| tm.0 + next_interval(tm.at_ns(0, 1), tm.at_ns(25, 0), Duration::new(0, 2)), | ||
| tm.at_ns(25, 1) | ||
| ); | ||
| } | ||
| } |
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