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use {
std::{
future::Future,
pin::Pin,
},
chrono::{
offset::LocalResult,
prelude::*,
},
tokio::io::{
AsyncRead,
AsyncWrite,
},
async_proto_derive::impl_protocol_for,
crate::{
Protocol,
ReadError,
WriteError,
},
};
#[cfg(any(feature = "read-sync", feature = "write-sync"))] use std::io::prelude::*;
impl_protocol_for! {
#[cfg_attr(docsrs, doc(cfg(feature = "chrono")))]
struct Utc;
}
#[cfg_attr(docsrs, doc(cfg(feature = "chrono")))]
impl Protocol for FixedOffset {
fn read<'a, R: AsyncRead + Unpin + Send + 'a>(stream: &'a mut R) -> Pin<Box<dyn Future<Output = Result<Self, ReadError>> + Send + 'a>> {
Box::pin(async move {
Self::east_opt(i32::read(stream).await?).ok_or_else(|| ReadError::Custom(format!("read an invalid UTC offset")))
})
}
fn write<'a, W: AsyncWrite + Unpin + Send + 'a>(&'a self, sink: &'a mut W) -> Pin<Box<dyn Future<Output = Result<(), WriteError>> + Send + 'a>> {
Box::pin(async move {
self.local_minus_utc().write(sink).await
})
}
#[cfg(feature = "read-sync")]
#[cfg_attr(docsrs, doc(cfg(feature = "read-sync")))]
fn read_sync(stream: &mut impl Read) -> Result<Self, ReadError> {
Self::east_opt(i32::read_sync(stream)?).ok_or_else(|| ReadError::Custom(format!("read an invalid UTC offset")))
}
#[cfg(feature = "write-sync")]
#[cfg_attr(docsrs, doc(cfg(feature = "write-sync")))]
fn write_sync(&self, sink: &mut impl Write) -> Result<(), WriteError> {
self.local_minus_utc().write_sync(sink)
}
}
#[cfg_attr(docsrs, doc(cfg(feature = "chrono")))]
impl<Tz: Protocol + TimeZone + Send + Sync> Protocol for DateTime<Tz>
where Tz::Offset: Sync {
fn read<'a, R: AsyncRead + Unpin + Send + 'a>(stream: &'a mut R) -> Pin<Box<dyn Future<Output = Result<Self, ReadError>> + Send + 'a>> {
Box::pin(async move {
match Tz::read(stream).await?.timestamp_opt(i64::read(stream).await?, u32::read(stream).await?) {
LocalResult::Single(dt) => Ok(dt),
LocalResult::None => Err(ReadError::Custom(format!("read a nonexistent timestamp"))),
LocalResult::Ambiguous(dt1, dt2) => Err(ReadError::Custom(format!("read an ambiguous timestamp that could refer to {:?} or {:?}", dt1, dt2))),
}
})
}
fn write<'a, W: AsyncWrite + Unpin + Send + 'a>(&'a self, sink: &'a mut W) -> Pin<Box<dyn Future<Output = Result<(), WriteError>> + Send + 'a>> {
Box::pin(async move {
self.timezone().write(sink).await?;
self.timestamp().write(sink).await?;
self.timestamp_subsec_nanos().write(sink).await?;
Ok(())
})
}
#[cfg(feature = "read-sync")]
#[cfg_attr(docsrs, doc(cfg(feature = "read-sync")))]
fn read_sync(stream: &mut impl Read) -> Result<Self, ReadError> {
match Tz::read_sync(stream)?.timestamp_opt(i64::read_sync(stream)?, u32::read_sync(stream)?) {
LocalResult::Single(dt) => Ok(dt),
LocalResult::None => Err(ReadError::Custom(format!("read a nonexistent timestamp"))),
LocalResult::Ambiguous(dt1, dt2) => Err(ReadError::Custom(format!("read an ambiguous timestamp that could refer to {:?} or {:?}", dt1, dt2))),
}
}
#[cfg(feature = "write-sync")]
#[cfg_attr(docsrs, doc(cfg(feature = "write-sync")))]
fn write_sync(&self, sink: &mut impl Write) -> Result<(), WriteError> {
self.timezone().write_sync(sink)?;
self.timestamp().write_sync(sink)?;
self.timestamp_subsec_nanos().write_sync(sink)?;
Ok(())
}
}