109 lines
3.3 KiB
Rust
109 lines
3.3 KiB
Rust
//! The `timing` module provides std::time utility functions.
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use crate::unchecked_div_by_const;
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use std::time::{Duration, SystemTime, UNIX_EPOCH};
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pub fn duration_as_ns(d: &Duration) -> u64 {
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d.as_secs()
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.saturating_mul(1_000_000_000)
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.saturating_add(u64::from(d.subsec_nanos()))
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}
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pub fn duration_as_us(d: &Duration) -> u64 {
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d.as_secs()
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.saturating_mul(1_000_000)
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.saturating_add(unchecked_div_by_const!(u64::from(d.subsec_nanos()), 1_000))
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}
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pub fn duration_as_ms(d: &Duration) -> u64 {
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d.as_secs()
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.saturating_mul(1000)
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.saturating_add(unchecked_div_by_const!(
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u64::from(d.subsec_nanos()),
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1_000_000
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))
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}
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pub fn duration_as_s(d: &Duration) -> f32 {
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d.as_secs() as f32 + (d.subsec_nanos() as f32 / 1_000_000_000.0)
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}
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pub fn timestamp() -> u64 {
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let now = SystemTime::now()
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.duration_since(UNIX_EPOCH)
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.expect("create timestamp in timing");
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duration_as_ms(&now)
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}
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pub const SECONDS_PER_YEAR: f64 = 365.242_199 * 24.0 * 60.0 * 60.0;
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/// from years to slots
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pub fn years_as_slots(years: f64, tick_duration: &Duration, ticks_per_slot: u64) -> f64 {
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// slots is years * slots/year
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years *
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// slots/year is seconds/year ...
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SECONDS_PER_YEAR
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// * (ns/s)/(ns/tick) / ticks/slot = 1/s/1/tick = ticks/s
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* (1_000_000_000.0 / duration_as_ns(tick_duration) as f64)
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// / ticks/slot
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/ ticks_per_slot as f64
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}
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/// From slots per year to slot duration
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pub fn slot_duration_from_slots_per_year(slots_per_year: f64) -> Duration {
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// Recently, rust changed from infinity as usize being zero to 2^64-1; ensure it's zero here
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let slot_in_ns = if slots_per_year != 0.0 {
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(SECONDS_PER_YEAR * 1_000_000_000.0) / slots_per_year
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} else {
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0.0
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};
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Duration::from_nanos(slot_in_ns as u64)
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}
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#[cfg(test)]
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mod test {
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use super::*;
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#[test]
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#[allow(clippy::float_cmp)]
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fn test_years_as_slots() {
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let tick_duration = Duration::from_micros(1000 * 1000 / 160);
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// interestingly large numbers with 160 ticks/second
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assert_eq!(years_as_slots(0.0, &tick_duration, 4) as u64, 0);
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assert_eq!(
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years_as_slots(1.0 / 12f64, &tick_duration, 4) as u64,
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105_189_753
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);
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assert_eq!(years_as_slots(1.0, &tick_duration, 4) as u64, 1_262_277_039);
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let tick_duration = Duration::from_micros(1000 * 1000);
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// one second in years with one tick per second + one tick per slot
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assert_eq!(
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years_as_slots(1.0 / SECONDS_PER_YEAR, &tick_duration, 1),
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1.0
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);
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}
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#[test]
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fn test_slot_duration_from_slots_per_year() {
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let slots_per_year = 1_262_277_039.0;
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let ticks_per_slot = 4;
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assert_eq!(
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slot_duration_from_slots_per_year(slots_per_year),
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Duration::from_micros(1000 * 1000 / 160) * ticks_per_slot
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);
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assert_eq!(
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slot_duration_from_slots_per_year(0.0),
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Duration::from_micros(0) * ticks_per_slot
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);
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let slots_per_year = SECONDS_PER_YEAR;
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let ticks_per_slot = 1;
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assert_eq!(
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slot_duration_from_slots_per_year(slots_per_year),
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Duration::from_millis(1000) * ticks_per_slot
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);
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}
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}
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