Lines
80.33 %
Functions
43.37 %
Branches
100 %
use std::borrow::Cow;
use std::time::{Duration, SystemTime, UNIX_EPOCH};
use serde::{Deserialize, Serialize};
use crate::key::{
ByteSource, CompositeKind, IncorrectByteLength, Key, KeyEncoding, KeyKind, KeyVisitor,
};
/// A timestamp relative to [`UNIX_EPOCH`].
#[derive(Serialize, Deserialize, Debug, Clone, Copy, Eq, PartialEq, PartialOrd, Ord, Default)]
pub struct Timestamp {
/// The number of whole seconds since [`UNIX_EPOCH`].
pub seconds: u64,
/// The number of nanoseconds in the timestamp.
pub nanos: u32,
}
impl Timestamp {
/// The maximum valid value of Timestamp.
pub const MAX: Self = Self {
seconds: u64::MAX,
nanos: 999_999_999,
/// The minimum representable Timestamp. This is equivalent to [`UNIX_EPOCH`].
pub const MIN: Self = Self {
seconds: 0,
nanos: 0,
/// Returns the current timestamp according to the OS. Uses [`SystemTime::now()`].
#[must_use]
pub fn now() -> Self {
Self::from(SystemTime::now())
impl From<SystemTime> for Timestamp {
fn from(time: SystemTime) -> Self {
let duration_since_epoch = time
.duration_since(UNIX_EPOCH)
.expect("unrealistic system time");
Self {
seconds: duration_since_epoch.as_secs(),
nanos: duration_since_epoch.subsec_nanos(),
impl From<Timestamp> for Duration {
fn from(t: Timestamp) -> Self {
Self::new(t.seconds, t.nanos)
impl std::ops::Sub for Timestamp {
type Output = Option<Duration>;
fn sub(self, rhs: Self) -> Self::Output {
Duration::from(self).checked_sub(Duration::from(rhs))
impl std::ops::Add<Duration> for Timestamp {
type Output = Self;
fn add(self, rhs: Duration) -> Self::Output {
let mut nanos = self.nanos + rhs.subsec_nanos();
let mut seconds = self.seconds.saturating_add(rhs.as_secs());
while nanos > 1_000_000_000 {
nanos -= 1_000_000_000;
seconds = seconds.saturating_add(1);
Self { seconds, nanos }
impl<'k> Key<'k> for Timestamp {
const CAN_OWN_BYTES: bool = false;
fn from_ord_bytes<'e>(bytes: ByteSource<'k, 'e>) -> Result<Self, Self::Error> {
if bytes.as_ref().len() != 12 {
return Err(IncorrectByteLength);
Ok(Self {
seconds: u64::from_ord_bytes(ByteSource::Borrowed(&bytes.as_ref()[0..8]))?,
nanos: u32::from_ord_bytes(ByteSource::Borrowed(&bytes.as_ref()[8..12]))?,
})
impl KeyEncoding<Self> for Timestamp {
type Error = IncorrectByteLength;
const LENGTH: Option<usize> = Some(12);
fn describe<Visitor>(visitor: &mut Visitor)
where
Visitor: KeyVisitor,
{
visitor.visit_composite(
CompositeKind::Struct(Cow::Borrowed("std::time::Timestamp")),
2,
);
visitor.visit_type(KeyKind::U64);
visitor.visit_type(KeyKind::U32);
fn as_ord_bytes(&self) -> Result<std::borrow::Cow<'_, [u8]>, Self::Error> {
let seconds_bytes: &[u8] = &self.seconds.to_be_bytes();
let nanos_bytes = &self.nanos.to_be_bytes();
Ok(Cow::Owned([seconds_bytes, nanos_bytes].concat()))
#[test]
fn key_test() {
let original = Timestamp::now();
assert_eq!(
Timestamp::from_ord_bytes(ByteSource::Borrowed(&original.as_ord_bytes().unwrap())).unwrap(),
original