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154 lines
3.8 KiB
154 lines
3.8 KiB
//! Stream traits
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use super::*;
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/// A type that implements both `AsyncWrite` and `AsyncRead`
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pub trait AsyncStream: AsyncRead + AsyncWrite{}
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impl<T: AsyncRead + AsyncWrite + ?Sized> AsyncStream for T{}
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/// A type that can split itself into other types, and combine back from those types.
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pub trait Split: Sized
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{
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/// First half of the split
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type First;
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/// Second half of the split
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type Second;
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fn split(self) -> (Self::First, Self::Second);
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fn unsplit(a: Self::First, b: Self::Second) -> Self;
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#[inline(always)] fn split_reverse(self) -> (Self::Second, Self::First)
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{
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let (tx, rx) = self.split();
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(rx, tx)
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}
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#[inline(always)] fn unsplit_reverse(b: Self::Second, a: Self::First) -> Self
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{
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Self::unsplit(a, b)
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}
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}
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impl<T, U> Split for (T, U)
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{
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type First = T;
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type Second = U;
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#[inline(always)] fn split(self) -> (Self::First, Self::Second) {
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self
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}
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#[inline(always)] fn unsplit(a: Self::First, b: Self::Second) -> Self {
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(a, b)
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}
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}
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//TODO: Add trait `SplitRef` for exchange, I guess?
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/// Merges a Read and Write stream in an implementor of `Split`, `AsyncRead`, and `Asyncwrite`.
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///
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/// Used for internal of `Stream`.
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#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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pub(super) struct Merge<Tx, Rx>(pub Tx, pub Rx);
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impl<Tx, Rx> Merge<Tx, Rx>
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{
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fn rx(self: Pin<&mut Self>) -> Pin<&mut Rx>
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{
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unsafe {self.map_unchecked_mut(|this| &mut this.1)}
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}
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fn tx(self: Pin<&mut Self>) -> Pin<&mut Tx>
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{
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unsafe {self.map_unchecked_mut(|this| &mut this.0)}
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}
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}
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impl<Tx, Rx> Split for Merge<Tx, Rx>
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{
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type First = Tx;
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type Second = Rx;
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#[inline] fn split(self) -> (Self::First, Self::Second) {
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(self.0, self.1)
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}
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#[inline] fn unsplit(a: Self::First, b: Self::Second) -> Self {
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Self(a, b)
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}
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}
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impl<Tx, Rx> AsyncWrite for Merge<Tx, Rx>
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where Tx: AsyncWrite
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{
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#[inline] fn poll_write(self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &[u8]) -> Poll<Result<usize, io::Error>> {
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self.tx().poll_write(cx, buf)
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}
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#[inline] fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
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self.tx().poll_flush(cx)
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}
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#[inline] fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), io::Error>> {
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self.tx().poll_flush(cx)
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}
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#[inline] fn poll_write_buf<B: Buf>(self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut B) -> Poll<Result<usize, io::Error>>
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where
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Self: Sized, {
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self.tx().poll_write_buf(cx, buf)
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}
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}
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impl<Tx, Rx> AsyncRead for Merge<Tx, Rx>
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where Rx: AsyncRead
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{
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#[inline] fn poll_read(self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut [u8]) -> Poll<io::Result<usize>> {
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self.rx().poll_read(cx, buf)
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}
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#[inline] fn poll_read_buf<B: BufMut>(self: Pin<&mut Self>, cx: &mut Context<'_>, buf: &mut B) -> Poll<io::Result<usize>>
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where
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Self: Sized, {
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self.rx().poll_read_buf(cx, buf)
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}
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}
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/*
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pub(super) enum MaybeFullWrite<'a, S: AsyncWrite>
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{
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Full(&'a mut Stream<S>),
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Half(&'a mut WriteHalf<S>),
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}
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pub(super) enum MaybeFullRead<'a, S: AsyncRead>
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{
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Full(&'a mut Stream<S>),
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Half(&'a mut ReadHalf<S>),
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}
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impl<'a, S: AsyncRead> AsMut<dyn AsyncRead + 'a> for MaybeFullRead<'a, S>
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{
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#[inline] fn as_mut(&mut self) -> &mut (dyn AsyncRead + 'a)
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{
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self.as_dyn()
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}
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}
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impl<'a, S: AsyncWrite> AsMut<dyn AsyncWrite + 'a> for MaybeFullWrite<'a, S>
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{
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#[inline] fn as_mut(&mut self) -> &mut (dyn AsyncWrite + 'a)
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{
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self.as_dyn()
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}
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}
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impl<'a, S: AsyncRead> MaybeFullRead<'a, S>
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{
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#[inline(always)] fn as_dyn(&mut self) -> &mut (dyn AsyncRead + 'a)
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{
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match self {
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Self::Full(f) => f,
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Self::Half(h) => h,
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}
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}
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}
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impl<'a, S: AsyncWrite> MaybeFullWrite<'a, S>
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{
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#[inline(always)] fn as_dyn(&mut self) -> &mut (dyn AsyncWrite + 'a)
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{
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match self {
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Self::Full(f) => f,
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Self::Half(h) => h,
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}
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}
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}
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*/
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