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|
mod buffer;
#[cfg(feature = "ws")]
mod websocket;
#[cfg(feature = "ws")]
pub use websocket::{ReadWsStream, WriteWsStream, WsStream};
use std::{
io::ErrorKind,
pin::Pin,
task::{Context, Poll},
};
use futures_util::{
ready,
stream::{Stream, StreamExt},
Sink,
};
use pin_project_lite::pin_project;
use karyon_core::async_runtime::io::{AsyncRead, AsyncWrite};
use crate::{
codec::{Decoder, Encoder},
Error, Result,
};
use buffer::Buffer;
const BUFFER_SIZE: usize = 2048 * 2048; // 4MB
const INITIAL_BUFFER_SIZE: usize = 1024 * 1024; // 1MB
pub struct ReadStream<T, C> {
inner: T,
decoder: C,
buffer: Buffer<Vec<u8>>,
}
impl<T, C> ReadStream<T, C>
where
T: AsyncRead + Unpin,
C: Decoder + Unpin,
{
pub fn new(inner: T, decoder: C) -> Self {
Self {
inner,
decoder,
buffer: Buffer::new(vec![0u8; BUFFER_SIZE]),
}
}
pub async fn recv(&mut self) -> Result<C::DeItem> {
match self.next().await {
Some(m) => m,
None => Err(Error::IO(std::io::ErrorKind::ConnectionAborted.into())),
}
}
}
pin_project! {
pub struct WriteStream<T, C> {
#[pin]
inner: T,
encoder: C,
high_water_mark: usize,
buffer: Buffer<Vec<u8>>,
}
}
impl<T, C> WriteStream<T, C>
where
T: AsyncWrite + Unpin,
C: Encoder + Unpin,
{
pub fn new(inner: T, encoder: C) -> Self {
Self {
inner,
encoder,
high_water_mark: 131072,
buffer: Buffer::new(vec![0u8; BUFFER_SIZE]),
}
}
}
impl<T, C> Stream for ReadStream<T, C>
where
T: AsyncRead + Unpin,
C: Decoder + Unpin,
{
type Item = Result<C::DeItem>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
let this = &mut *self;
if let Some((n, item)) = this.decoder.decode(this.buffer.as_mut())? {
this.buffer.advance(n);
return Poll::Ready(Some(Ok(item)));
}
let mut buf = [0u8; INITIAL_BUFFER_SIZE];
#[cfg(feature = "tokio")]
let mut buf = tokio::io::ReadBuf::new(&mut buf);
loop {
#[cfg(feature = "smol")]
let n = ready!(Pin::new(&mut this.inner).poll_read(cx, &mut buf))?;
#[cfg(feature = "smol")]
let bytes = &buf[..n];
#[cfg(feature = "tokio")]
ready!(Pin::new(&mut this.inner).poll_read(cx, &mut buf))?;
#[cfg(feature = "tokio")]
let bytes = buf.filled();
#[cfg(feature = "tokio")]
let n = bytes.len();
this.buffer.extend_from_slice(bytes);
#[cfg(feature = "tokio")]
buf.clear();
match this.decoder.decode(this.buffer.as_mut())? {
Some((cn, item)) => {
this.buffer.advance(cn);
return Poll::Ready(Some(Ok(item)));
}
None if n == 0 => {
if this.buffer.is_empty() {
return Poll::Ready(None);
} else {
return Poll::Ready(Some(Err(std::io::Error::new(
std::io::ErrorKind::UnexpectedEof,
"bytes remaining in read stream",
)
.into())));
}
}
_ => continue,
}
}
}
}
impl<T, C> Sink<C::EnItem> for WriteStream<T, C>
where
T: AsyncWrite + Unpin,
C: Encoder + Unpin,
{
type Error = Error;
fn poll_ready(mut self: Pin<&mut Self>, cx: &mut Context) -> Poll<Result<()>> {
let this = &mut *self;
while !this.buffer.is_empty() {
let n = ready!(Pin::new(&mut this.inner).poll_write(cx, this.buffer.as_ref()))?;
if n == 0 {
return Poll::Ready(Err(std::io::Error::new(
ErrorKind::UnexpectedEof,
"End of file",
)
.into()));
}
this.buffer.advance(n);
}
Poll::Ready(Ok(()))
}
fn start_send(mut self: Pin<&mut Self>, item: C::EnItem) -> Result<()> {
let this = &mut *self;
let mut buf = [0u8; INITIAL_BUFFER_SIZE];
let n = this.encoder.encode(&item, &mut buf)?;
this.buffer.extend_from_slice(&buf[..n]);
Ok(())
}
fn poll_flush(
mut self: Pin<&mut Self>,
cx: &mut Context,
) -> Poll<std::result::Result<(), Self::Error>> {
ready!(self.as_mut().poll_ready(cx))?;
self.project().inner.poll_flush(cx).map_err(Into::into)
}
fn poll_close(
mut self: Pin<&mut Self>,
cx: &mut Context,
) -> Poll<std::result::Result<(), Self::Error>> {
ready!(self.as_mut().poll_flush(cx))?;
#[cfg(feature = "smol")]
return self.project().inner.poll_close(cx).map_err(Error::from);
#[cfg(feature = "tokio")]
return self.project().inner.poll_shutdown(cx).map_err(Error::from);
}
}
|
