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implement
Transformable for std::time::Instant
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| # UNRELEASED | ||
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| # 0.1.2 (January 6th, 2022) | ||
| # 0.1.2 (Dec 23rd, 2023) | ||
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| FEATURES | ||
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| - Implement `Transformable` for `std::time::Instant`. |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,155 @@ | ||
| use std::{ | ||
| sync::OnceLock, | ||
| time::{Instant, SystemTime, SystemTimeError}, | ||
| }; | ||
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| use super::*; | ||
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| /// Error returned by [`Instant`] when transforming. | ||
| #[derive(Debug, Clone)] | ||
| pub enum InstantTransformError { | ||
| /// The buffer is too small to encode the value. | ||
| EncodeBufferTooSmall, | ||
| /// Corrupted binary data. | ||
| Corrupted, | ||
| /// Invalid system time. | ||
| InvalidSystemTime(SystemTimeError), | ||
| } | ||
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| impl core::fmt::Display for InstantTransformError { | ||
| fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result { | ||
| match self { | ||
| Self::EncodeBufferTooSmall => write!( | ||
| f, | ||
| "buffer is too small, use `Transformable::encoded_len` to pre-allocate a buffer with enough space" | ||
| ), | ||
| Self::Corrupted => write!(f, "corrupted binary data"), | ||
| Self::InvalidSystemTime(e) => write!(f, "{e}"), | ||
| } | ||
| } | ||
| } | ||
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| #[cfg(feature = "std")] | ||
| impl std::error::Error for InstantTransformError {} | ||
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| impl Transformable for Instant { | ||
| type Error = InstantTransformError; | ||
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| fn encode(&self, dst: &mut [u8]) -> Result<(), Self::Error> { | ||
| if dst.len() < self.encoded_len() { | ||
| return Err(Self::Error::EncodeBufferTooSmall); | ||
| } | ||
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| let buf = encode_duration_unchecked(encode_instant_to_duration(*self)); | ||
| dst[..ENCODED_LEN].copy_from_slice(&buf); | ||
| Ok(()) | ||
| } | ||
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| #[cfg(feature = "std")] | ||
| #[cfg_attr(docsrs, doc(cfg(feature = "std")))] | ||
| fn encode_to_writer<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> { | ||
| let mut buf = [0u8; ENCODED_LEN]; | ||
| self | ||
| .encode(&mut buf) | ||
| .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, e))?; | ||
| writer.write_all(&buf) | ||
| } | ||
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| #[cfg(feature = "async")] | ||
| #[cfg_attr(docsrs, doc(cfg(feature = "async")))] | ||
| async fn encode_to_async_writer<W: futures_util::io::AsyncWrite + Send + Unpin>( | ||
| &self, | ||
| writer: &mut W, | ||
| ) -> std::io::Result<()> | ||
| where | ||
| Self::Error: Send + Sync + 'static, | ||
| { | ||
| use futures_util::AsyncWriteExt; | ||
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| let mut buf = [0u8; ENCODED_LEN]; | ||
| self | ||
| .encode(&mut buf) | ||
| .map_err(|e| std::io::Error::new(std::io::ErrorKind::InvalidData, e))?; | ||
| writer.write_all(&buf).await | ||
| } | ||
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| fn encoded_len(&self) -> usize { | ||
| ENCODED_LEN | ||
| } | ||
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| fn decode(src: &[u8]) -> Result<(usize, Self), Self::Error> | ||
| where | ||
| Self: Sized, | ||
| { | ||
| if src.len() < ENCODED_LEN { | ||
| return Err(Self::Error::Corrupted); | ||
| } | ||
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| let (readed, instant) = decode_duration_unchecked(src); | ||
| Ok((readed, decode_instant_from_duration(instant))) | ||
| } | ||
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| #[cfg(feature = "std")] | ||
| #[cfg_attr(docsrs, doc(cfg(feature = "std")))] | ||
| fn decode_from_reader<R: std::io::Read>(reader: &mut R) -> std::io::Result<(usize, Self)> | ||
| where | ||
| Self: Sized, | ||
| { | ||
| let mut buf = [0; ENCODED_LEN]; | ||
| reader.read_exact(&mut buf)?; | ||
| let (readed, instant) = decode_duration_unchecked(&buf); | ||
| Ok((readed, decode_instant_from_duration(instant))) | ||
| } | ||
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| #[cfg(feature = "async")] | ||
| #[cfg_attr(docsrs, doc(cfg(feature = "async")))] | ||
| async fn decode_from_async_reader<R: futures_util::io::AsyncRead + Send + Unpin>( | ||
| reader: &mut R, | ||
| ) -> std::io::Result<(usize, Self)> | ||
| where | ||
| Self: Sized, | ||
| Self::Error: Send + Sync + 'static, | ||
| { | ||
| use futures_util::AsyncReadExt; | ||
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| let mut buf = [0; ENCODED_LEN]; | ||
| reader.read_exact(&mut buf).await?; | ||
| let (readed, instant) = decode_duration_unchecked(&buf); | ||
| Ok((readed, decode_instant_from_duration(instant))) | ||
| } | ||
| } | ||
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| fn init(now: Instant) -> (SystemTime, Instant) { | ||
| static ONCE: OnceLock<(SystemTime, Instant)> = OnceLock::new(); | ||
| *ONCE.get_or_init(|| { | ||
| let system_now = SystemTime::now(); | ||
| (system_now, now) | ||
| }) | ||
| } | ||
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| #[inline] | ||
| fn encode_instant_to_duration(instant: Instant) -> Duration { | ||
| let (system_now, instant_now) = init(instant); | ||
| if instant <= instant_now { | ||
| system_now.duration_since(SystemTime::UNIX_EPOCH).unwrap() + (instant_now - instant) | ||
| } else { | ||
| system_now.duration_since(SystemTime::UNIX_EPOCH).unwrap() + (instant - instant_now) | ||
| } | ||
| } | ||
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| #[inline] | ||
| fn decode_instant_from_duration(duration: Duration) -> Instant { | ||
| let (system_now, instant_now) = init(Instant::now()); | ||
| let system_time = SystemTime::UNIX_EPOCH + duration; | ||
| if system_time >= system_now { | ||
| instant_now + system_time.duration_since(system_now).unwrap() | ||
| } else { | ||
| instant_now - system_now.duration_since(system_time).unwrap() | ||
| } | ||
| } | ||
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| test_transformable!(Instant => test_instant_transformable({ | ||
| let now = Instant::now(); | ||
| std::thread::sleep(std::time::Duration::from_millis(10)); | ||
| now | ||
| })); |
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