105 lines
2.6 KiB
Rust
105 lines
2.6 KiB
Rust
#![allow(clippy::enum_glob_use)]
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use std::time::{Duration, SystemTime, UNIX_EPOCH};
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#[inline]
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#[must_use]
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#[allow(clippy::as_conversions)]
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pub fn now_millis() -> u64 {
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UNIX_EPOCH
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.elapsed()
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.expect("positive duration after epoch")
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.as_millis() as u64
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}
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#[must_use]
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pub fn rfc2822_from_seconds(epoch: i64) -> String {
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use chrono::{DateTime, Utc};
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DateTime::<Utc>::from_timestamp(epoch, 0)
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.unwrap_or_default()
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.to_rfc2822()
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}
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#[must_use]
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pub fn format(ts: SystemTime, str: &str) -> String {
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use chrono::{DateTime, Utc};
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let dt: DateTime<Utc> = ts.into();
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dt.format(str).to_string()
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}
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#[must_use]
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pub fn pretty(d: Duration) -> String {
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use Unit::*;
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let fmt = |w, f, u| format!("{w}.{f} {u}");
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let gen64 = |w, f, u| fmt(w, (f * 100.0) as u64, u);
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let gen128 = |w, f, u| gen64(u64::try_from(w).expect("u128 to u64"), f, u);
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match whole_and_frac(d) {
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(Days(whole), frac) => gen64(whole, frac, "days"),
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(Hours(whole), frac) => gen64(whole, frac, "hours"),
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(Mins(whole), frac) => gen64(whole, frac, "minutes"),
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(Secs(whole), frac) => gen64(whole, frac, "seconds"),
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(Millis(whole), frac) => gen128(whole, frac, "milliseconds"),
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(Micros(whole), frac) => gen128(whole, frac, "microseconds"),
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(Nanos(whole), frac) => gen128(whole, frac, "nanoseconds"),
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}
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}
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/// Return a pair of (whole part, frac part) from a duration where. The whole
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/// part is the largest Unit containing a non-zero value, the frac part is a
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/// rational remainder left over.
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#[must_use]
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pub fn whole_and_frac(d: Duration) -> (Unit, f64) {
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use Unit::*;
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let whole = whole_unit(d);
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(
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whole,
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match whole {
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Days(_) => (d.as_secs() % 86_400) as f64 / 86_400.0,
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Hours(_) => (d.as_secs() % 3_600) as f64 / 3_600.0,
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Mins(_) => (d.as_secs() % 60) as f64 / 60.0,
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Secs(_) => f64::from(d.subsec_millis()) / 1000.0,
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Millis(_) => f64::from(d.subsec_micros()) / 1000.0,
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Micros(_) => f64::from(d.subsec_nanos()) / 1000.0,
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Nanos(_) => 0.0,
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},
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)
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}
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/// Return the largest Unit which represents the duration. The value is
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/// rounded-down, but never zero.
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#[must_use]
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pub fn whole_unit(d: Duration) -> Unit {
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use Unit::*;
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match d.as_secs() {
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86_400.. => Days(d.as_secs() / 86_400),
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3_600..=86_399 => Hours(d.as_secs() / 3_600),
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60..=3_599 => Mins(d.as_secs() / 60),
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_ => match d.as_micros() {
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1_000_000.. => Secs(d.as_secs()),
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1_000..=999_999 => Millis(d.subsec_millis().into()),
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_ => match d.as_nanos() {
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1_000.. => Micros(d.subsec_micros().into()),
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_ => Nanos(d.subsec_nanos().into()),
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},
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},
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}
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}
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#[derive(Eq, PartialEq, Clone, Copy, Debug)]
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pub enum Unit {
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Days(u64),
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Hours(u64),
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Mins(u64),
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Secs(u64),
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Millis(u128),
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Micros(u128),
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Nanos(u128),
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}
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