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use libc::{SHUT_RD, SHUT_WR};
use std::{
fmt,
io::Result,
mem::ManuallyDrop,
net::Shutdown,
pin::Pin,
sync::Arc,
task::{Context, Poll},
};
use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
use super::Stream;
use crate::sock;
#[derive(Debug)]
pub struct ReadHalf<'a>(pub(crate) &'a Stream);
impl<'a> ReadHalf<'a> {
pub async fn peek(&self, buf: &mut [u8]) -> Result<usize> {
self.0.socket.peek_priv(buf).await
}
pub fn poll_peek(&self, cx: &mut Context, buf: &mut ReadBuf) -> Poll<Result<usize>> {
self.0.socket.poll_peek_priv(cx, buf)
}
}
impl<'a> AsRef<Stream> for ReadHalf<'a> {
fn as_ref(&self) -> &Stream {
self.0
}
}
impl<'a> AsyncRead for ReadHalf<'a> {
fn poll_read(self: Pin<&mut Self>, cx: &mut Context, buf: &mut ReadBuf) -> Poll<Result<()>> {
self.0.socket.poll_recv_priv(cx, buf)
}
}
#[derive(Debug)]
pub struct WriteHalf<'a>(pub(crate) &'a Stream);
impl<'a> AsRef<Stream> for WriteHalf<'a> {
fn as_ref(&self) -> &Stream {
self.0
}
}
impl<'a> AsyncWrite for WriteHalf<'a> {
fn poll_write(self: Pin<&mut Self>, cx: &mut Context, buf: &[u8]) -> Poll<Result<usize>> {
self.0.poll_write_priv(cx, buf)
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<()>> {
self.0.socket.poll_flush_priv(cx)
}
fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<()>> {
self.0.socket.poll_shutdown_priv(cx, Shutdown::Write)
}
}
#[derive(Debug)]
pub struct ReuniteError(pub OwnedReadHalf, pub OwnedWriteHalf);
impl fmt::Display for ReuniteError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "ReuniteError")
}
}
impl std::error::Error for ReuniteError {}
pub(crate) fn reunite(
mut read: OwnedReadHalf, write: OwnedWriteHalf,
) -> std::result::Result<Stream, ReuniteError> {
if Arc::ptr_eq(&read.stream, &write.stream) {
write.forget();
read.drop = false;
let stream_arc = unsafe { ManuallyDrop::take(&mut read.stream) };
Ok(Arc::try_unwrap(stream_arc).expect("Stream: try_unwrap failed"))
} else {
Err(ReuniteError(read, write))
}
}
#[derive(Debug)]
pub struct OwnedReadHalf {
pub(crate) stream: ManuallyDrop<Arc<Stream>>,
pub(crate) shutdown_on_drop: bool,
pub(crate) drop: bool,
}
impl OwnedReadHalf {
pub fn reunite(self, other: OwnedWriteHalf) -> std::result::Result<Stream, ReuniteError> {
reunite(self, other)
}
pub async fn peek(&self, buf: &mut [u8]) -> Result<usize> {
self.stream.socket.peek_priv(buf).await
}
pub fn poll_peek(&self, cx: &mut Context, buf: &mut ReadBuf) -> Poll<Result<usize>> {
self.stream.socket.poll_peek_priv(cx, buf)
}
pub fn forget(mut self) {
self.shutdown_on_drop = false;
drop(self);
}
}
impl AsRef<Stream> for OwnedReadHalf {
fn as_ref(&self) -> &Stream {
&*self.stream
}
}
impl AsyncRead for OwnedReadHalf {
fn poll_read(self: Pin<&mut Self>, cx: &mut Context, buf: &mut ReadBuf) -> Poll<Result<()>> {
self.stream.socket.poll_recv_priv(cx, buf)
}
}
impl Drop for OwnedReadHalf {
fn drop(&mut self) {
if self.drop {
if self.shutdown_on_drop {
let _ = sock::shutdown(self.stream.socket.fd.get_ref(), SHUT_RD);
}
unsafe {
ManuallyDrop::drop(&mut self.stream);
}
}
}
}
#[derive(Debug)]
pub struct OwnedWriteHalf {
pub(crate) stream: Arc<Stream>,
pub(crate) shutdown_on_drop: bool,
}
impl OwnedWriteHalf {
pub fn reunite(self, other: OwnedReadHalf) -> std::result::Result<Stream, ReuniteError> {
reunite(other, self)
}
pub fn forget(mut self) {
self.shutdown_on_drop = false;
drop(self);
}
}
impl AsRef<Stream> for OwnedWriteHalf {
fn as_ref(&self) -> &Stream {
&*self.stream
}
}
impl AsyncWrite for OwnedWriteHalf {
fn poll_write(self: Pin<&mut Self>, cx: &mut Context, buf: &[u8]) -> Poll<Result<usize>> {
self.stream.poll_write_priv(cx, buf)
}
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<()>> {
self.stream.socket.poll_flush_priv(cx)
}
fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<()>> {
self.stream.socket.poll_shutdown_priv(cx, Shutdown::Write)
}
}
impl Drop for OwnedWriteHalf {
fn drop(&mut self) {
if self.shutdown_on_drop {
let _ = sock::shutdown(self.stream.socket.fd.get_ref(), SHUT_WR);
}
}
}