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use crate::DateTime;
use serde::{de, ser};
use serde::{Deserialize, Deserializer, Serialize, Serializer};
use std::ops::Deref;
use time::{format_description, OffsetDateTime, UtcOffset};
const NANOS_PER_SEC: i128 = 1_000_000_000;
const NANOS_PER_MSEC: i128 = 1_000_000;
#[derive(Debug, Serialize, Deserialize)]
#[non_exhaustive]
struct Time {
#[serde(rename = "$reql_type$")]
reql_type: String,
#[serde(with = "epoch_time")]
epoch_time: String,
timezone: String,
}
impl<'de> Deserialize<'de> for DateTime {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: Deserializer<'de>,
{
let time = Time::deserialize(deserializer)?;
let format = match format_description::parse("[offset_hour]:[offset_minute]") {
Ok(fmt) => fmt,
Err(error) => {
return Err(de::Error::custom(error));
}
};
let offset = match UtcOffset::parse(&time.timezone, &format) {
Ok(offset) => offset,
Err(error) => {
return Err(de::Error::custom(error));
}
};
let (secs, msecs) = match time.epoch_time.split_once('.') {
Some(parts) => parts,
None => (time.epoch_time.as_str(), "0"),
};
let secs = match secs.parse::<i128>() {
Ok(secs) => match secs.checked_mul(NANOS_PER_SEC) {
Some(secs) => secs,
None => {
return Err(de::Error::custom("seconds to nanosecond overflow"));
}
},
Err(..) => {
return Err(de::Error::custom("invalid epoch time seconds"));
}
};
let msecs = match msecs.parse::<i128>() {
Ok(int) => {
let msecs = match msecs.len() {
3 => int,
2 => int * 10,
1 => int * 100,
_ => {
return Err(de::Error::custom("invalid epoch milliseconds"));
}
};
match msecs.checked_mul(NANOS_PER_MSEC) {
Some(msecs) => msecs,
None => {
return Err(de::Error::custom("millisecond to nanosecond overflow"));
}
}
}
Err(..) => {
return Err(de::Error::custom("invalid epoch time milliseconds"));
}
};
let timestamp = match secs.checked_add(msecs) {
Some(timestamp) => timestamp,
None => {
return Err(de::Error::custom("timestamp addition overflow"));
}
};
let dt = match OffsetDateTime::from_unix_timestamp_nanos(timestamp) {
Ok(date_time) => date_time.to_offset(offset),
Err(error) => {
return Err(de::Error::custom(error));
}
};
Ok(DateTime(dt))
}
}
impl Serialize for DateTime {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
let dt = &self.0;
let offset = dt.offset();
let timezone = {
let (hours, minutes, _) = offset.as_hms();
format!(
"{}{:02}:{:02}",
if offset.is_negative() { '-' } else { '+' },
hours.abs(),
minutes.abs(),
)
};
let time = Time {
reql_type: "TIME".to_owned(),
epoch_time: format!("{}.{:03}", dt.unix_timestamp(), dt.millisecond()),
timezone,
};
time.serialize(serializer)
}
}
impl Deref for DateTime {
type Target = OffsetDateTime;
fn deref(&self) -> &Self::Target {
&self.0
}
}
mod epoch_time {
use super::*;
pub fn serialize<S>(epoch_time: &str, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
match epoch_time.parse::<f64>() {
Ok(timestamp) => serializer.serialize_f64(timestamp),
Err(..) => Err(ser::Error::custom("invalid epoch timestamp")),
}
}
pub fn deserialize<'de, D>(deserializer: D) -> Result<String, D::Error>
where
D: Deserializer<'de>,
{
let timestamp = f64::deserialize(deserializer)?;
Ok(timestamp.to_string())
}
}
#[cfg(test)]
mod test {
use super::*;
use time::macros::datetime;
#[test]
fn with_milliseconds() {
let dt = DateTime(datetime!(2042-10-28 17:53:47.060 +1:30));
let serialized = serde_json::to_string(&dt).unwrap();
let parsed = serde_json::from_str(&serialized).unwrap();
assert_eq!(dt, parsed);
}
#[test]
fn with_seconds() {
let dt = DateTime(datetime!(2042-10-28 17:53:47 +1:30));
let serialized = serde_json::to_string(&dt).unwrap();
let parsed = serde_json::from_str(&serialized).unwrap();
assert_eq!(dt, parsed);
}
#[test]
fn with_minutes() {
let dt = DateTime(datetime!(2042-10-28 17:53 +1:30));
let serialized = serde_json::to_string(&dt).unwrap();
let parsed = serde_json::from_str(&serialized).unwrap();
assert_eq!(dt, parsed);
}
}
