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use crate::error::{Error, Kind};
use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use std::convert::{Infallible, TryFrom};
use std::fmt;
use std::ops::{Add, Sub};
use std::str::FromStr;
use std::time::{Duration, SystemTime, UNIX_EPOCH};
use tendermint_proto::google::protobuf::Timestamp;
use tendermint_proto::serializers::timestamp;
use tendermint_proto::Protobuf;
#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord, Serialize, Deserialize)]
#[serde(try_from = "Timestamp", into = "Timestamp")]
pub struct Time(DateTime<Utc>);
impl Protobuf<Timestamp> for Time {}
impl TryFrom<Timestamp> for Time {
type Error = Infallible;
fn try_from(value: Timestamp) -> Result<Self, Self::Error> {
let prost_value = prost_types::Timestamp {
seconds: value.seconds,
nanos: value.nanos,
};
Ok(SystemTime::from(prost_value).into())
}
}
impl From<Time> for Timestamp {
fn from(value: Time) -> Self {
let prost_value = prost_types::Timestamp::from(SystemTime::from(value));
Timestamp {
seconds: prost_value.seconds,
nanos: prost_value.nanos,
}
}
}
impl Time {
pub fn now() -> Self {
Time(Utc::now())
}
pub fn unix_epoch() -> Self {
UNIX_EPOCH.into()
}
pub fn duration_since(&self, other: Time) -> Result<Duration, Error> {
self.0
.signed_duration_since(other.0)
.to_std()
.map_err(|_| Kind::OutOfRange.into())
}
pub fn parse_from_rfc3339(s: &str) -> Result<Time, Error> {
Ok(Time(DateTime::parse_from_rfc3339(s)?.with_timezone(&Utc)))
}
pub fn as_rfc3339(&self) -> String {
timestamp::as_rfc3339_nanos(&self.0)
}
}
impl fmt::Display for Time {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
write!(f, "{}", self.as_rfc3339())
}
}
impl FromStr for Time {
type Err = Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
Time::parse_from_rfc3339(s)
}
}
impl From<DateTime<Utc>> for Time {
fn from(t: DateTime<Utc>) -> Time {
Time(t)
}
}
impl From<Time> for DateTime<Utc> {
fn from(t: Time) -> DateTime<Utc> {
t.0
}
}
impl From<SystemTime> for Time {
fn from(t: SystemTime) -> Time {
Time(t.into())
}
}
impl From<Time> for SystemTime {
fn from(t: Time) -> SystemTime {
t.0.into()
}
}
impl Add<Duration> for Time {
type Output = Self;
fn add(self, rhs: Duration) -> Self::Output {
let st: SystemTime = self.into();
(st + rhs).into()
}
}
impl Sub<Duration> for Time {
type Output = Self;
fn sub(self, rhs: Duration) -> Self::Output {
let st: SystemTime = self.into();
(st - rhs).into()
}
}
pub trait ParseTimestamp {
fn parse_timestamp(&self) -> Result<Time, Error>;
}
#[cfg(test)]
mod tests {
use super::*;
use proptest::{prelude::*, sample::select};
use tendermint_pbt_gen as pbt;
fn particular_rfc3339_timestamps() -> impl Strategy<Value = String> {
let strs: Vec<String> = vec![
"2020-09-14T16:33:54.21191421Z",
"2020-09-14T16:33:00Z",
"2020-09-14T16:33:00.1Z",
"2020-09-14T16:33:00.211914212Z",
"1970-01-01T00:00:00Z",
"2021-01-07T20:25:56.0455760Z",
"2021-01-07T20:25:57.039219Z",
"2021-01-07T20:25:58.03562100Z",
"2021-01-07T20:25:59.000955200Z",
"2021-01-07T20:26:04.0121030Z",
"2021-01-07T20:26:05.005096Z",
"2021-01-07T20:26:09.08488400Z",
"2021-01-07T20:26:11.0875340Z",
"2021-01-07T20:26:12.078268Z",
"2021-01-07T20:26:13.08074100Z",
"2021-01-07T20:26:15.079663000Z",
]
.into_iter()
.map(String::from)
.collect();
select(strs)
}
proptest! {
#[test]
fn can_parse_rfc3339_timestamps(stamp in pbt::time::arb_rfc3339_timestamp()) {
prop_assert!(stamp.parse::<Time>().is_ok())
}
#[test]
fn serde_from_value_is_the_inverse_of_to_value_within_reasonable_time_range(
datetime in pbt::time::arb_datetime()
) {
let time: Time = datetime.into();
let json_encoded_time = serde_json::to_value(&time).unwrap();
let decoded_time: Time = serde_json::from_value(json_encoded_time).unwrap();
prop_assert_eq!(time, decoded_time);
}
#[test]
fn serde_of_rfc3339_timestamps_is_safe(
stamp in prop_oneof![
pbt::time::arb_rfc3339_timestamp(),
particular_rfc3339_timestamps(),
]
) {
let time: Time = stamp.parse().unwrap();
let json_encoded_time = serde_json::to_value(&time).unwrap();
let decoded_time: Time = serde_json::from_value(json_encoded_time).unwrap();
prop_assert_eq!(time, decoded_time);
}
}
}