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use anyhow::{Error, Result};
use chrono::{DateTime, Datelike, Utc};
use diesel::{
backend::Backend,
deserialize::{self, FromSql, FromSqlRow},
expression::AsExpression,
serialize::{self, ToSql},
sql_types::Text,
sqlite::Sqlite,
};
use serde::{Deserialize, Serialize};
#[derive(
Eq,
PartialEq,
Ord,
PartialOrd,
Serialize,
Deserialize,
Clone,
Debug,
AsExpression,
FromSqlRow,
)]
#[diesel(sql_type=Text)]
pub struct DateTimeUtc {
chrono_datetime_utc: DateTime<Utc>,
}
impl DateTimeUtc {
pub fn day_diff(&self, other: &DateTimeUtc) -> u32 {
self.chrono_datetime_utc
.num_days_from_ce()
.abs_diff(other.chrono_datetime_utc.num_days_from_ce())
}
pub fn new(chrono_datetime_utc: &DateTime<Utc>) -> Self {
Self {
chrono_datetime_utc: chrono_datetime_utc.clone(),
}
}
pub fn now() -> Self {
Self::new(&Utc::now())
}
/// Constructs DateTimeUtc from a day string, YYYY-MM-DD, in UTC
/// Example: "2024-10-24" -> Midnight 24 Oct 2024 UTC
pub fn from_day_str(day_str: &str) -> Result<Self> {
if !Self::is_day_str(day_str) {
Err(Error::msg(format!("{} is not a day string in YYYY-MM-DD format", day_str)))
} else {
let mut date_str = String::from(day_str);
date_str.push_str("T00:00:00.000Z");
Ok(Self::from_date_str(&date_str)?)
}
}
/// Constructs DateTimeUtc from a date string in ISO format, in UTC
/// Example: "2024-10-24T10:30:00.000" -> 10.30am 24 Oct 2024 UTC
pub fn from_date_str(date_time_utc: &str) -> Result<Self> {
let chrono_datetime_utc = date_time_utc.parse::<DateTime<Utc>>()?;
Ok(Self {
chrono_datetime_utc,
})
}
/// Converts to a day string, YYYY-MM-DD, in UTC
/// Example: 10.30am 24 Oct 2024 UTC -> "2024-10-24"
pub fn to_day_str(&self) -> String {
let date_str = self.to_date_str();
let day_str = date_str
.split_at_checked(10)
.unwrap()
.0;
String::from(day_str)
}
/// Converts to a date string in ISO format, in UTC
/// Example: 10.30am 24 Oct 2024 UTC -> "2024-10-24T10:30:00.000Z"
pub fn to_date_str(&self) -> String {
self.chrono_datetime_utc.to_rfc3339()
}
fn is_day_str(str: &str) -> bool {
if str.len() != 10 {
return false;
}
for (ix, ch) in str.chars().enumerate() {
if ix == 4 || ix == 7 {
if ch != '-' {
return false;
}
} else {
if ch < '0' || ch > '9' {
return false;
}
}
}
return true;
}
}
impl ToSql<Text, Sqlite> for DateTimeUtc {
fn to_sql<'b>(
&'b self,
out: &mut diesel::serialize::Output<'b, '_, Sqlite>,
) -> serialize::Result {
out.set_value(self.to_date_str());
Ok(serialize::IsNull::No)
}
}
impl FromSql<Text, Sqlite> for DateTimeUtc {
fn from_sql(bytes: <Sqlite as Backend>::RawValue<'_>) -> deserialize::Result<DateTimeUtc> {
let str = <String as FromSql<Text, Sqlite>>::from_sql(bytes)?;
Ok(Self::from_date_str(&str)?)
}
}
#[cfg(test)]
mod test {
use chrono::TimeZone;
use super::*;
#[test]
fn given_midnight_when_day_diff_next_midnight_less_1s_then_return_0() {
let start = DateTimeUtc::new(&Utc.with_ymd_and_hms(2000, 1, 1, 0, 0, 0).unwrap().to_utc());
let end = DateTimeUtc::new(
&Utc.with_ymd_and_hms(2000, 1, 1, 23, 59, 59)
.unwrap()
.to_utc(),
);
let day_diff = start.day_diff(&end);
let neg_day_diff = end.day_diff(&start);
assert_eq!(day_diff, 0);
assert_eq!(day_diff, neg_day_diff);
}
#[test]
fn given_midnight_when_day_diff_next_midnight_then_return_1() {
let start = DateTimeUtc::new(&Utc.with_ymd_and_hms(2000, 1, 1, 0, 0, 0).unwrap().to_utc());
let end = DateTimeUtc::new(&Utc.with_ymd_and_hms(2000, 1, 2, 0, 0, 0).unwrap().to_utc());
let day_diff = start.day_diff(&end);
let neg_day_diff = end.day_diff(&start);
assert_eq!(day_diff, 1);
assert_eq!(day_diff, neg_day_diff);
}
#[test]
fn given_midnight_less_1s_when_day_diff_midnight_then_return_1() {
let start = DateTimeUtc::new(
&Utc.with_ymd_and_hms(2000, 1, 1, 23, 59, 59)
.unwrap()
.to_utc(),
);
let end = DateTimeUtc::new(&Utc.with_ymd_and_hms(2000, 1, 2, 0, 0, 0).unwrap().to_utc());
let day_diff = start.day_diff(&end);
let neg_day_diff = end.day_diff(&start);
assert_eq!(day_diff, 1);
assert_eq!(day_diff, neg_day_diff);
}
#[test]
fn given_23_nov_1970_when_to_day_str_then_return_iso_day_str() {
let date_time_utc = DateTimeUtc::new(
&Utc.with_ymd_and_hms(1970, 11, 23, 0, 0, 0)
.unwrap()
.to_utc(),
);
assert_eq!(date_time_utc.to_day_str(), "1970-11-23");
}
}
|
