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use crate::encode::AsyncEncoder;
use std::pin::Pin;
use std::task::{Context, Poll};
use tokio::io::AsyncWrite;
type Tx<T = Vec<u8>> = tokio::sync::mpsc::Sender<T>;
pub type AsyncWriter = AsyncEncoder<AsyncMpscWriter>;
pub struct AsyncMpscWriter {
buffer: Vec<u8>,
sender: Tx,
}
impl std::fmt::Debug for AsyncMpscWriter {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("AsyncMpscWriter").finish()
}
}
impl Clone for AsyncMpscWriter {
fn clone(&self) -> Self {
Self {
buffer: Vec::new(),
sender: self.sender.clone(),
}
}
}
impl AsyncMpscWriter {
pub const fn new(sender: Tx) -> Self {
Self {
buffer: Vec::new(),
sender,
}
}
}
impl AsyncWrite for AsyncMpscWriter {
fn poll_write(
self: Pin<&mut Self>,
_cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<std::io::Result<usize>> {
self.get_mut().buffer.extend_from_slice(buf);
Poll::Ready(Ok(buf.len()))
}
fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<std::io::Result<()>> {
use std::io::{Error, ErrorKind};
use tokio::sync::mpsc::error;
let this = self.get_mut();
let data = std::mem::take(&mut this.buffer);
match this.sender.try_send(data) {
Ok(..) => Poll::Ready(Ok(())),
Err(error::TrySendError::Closed(..)) => {
let err = Err(Error::new(ErrorKind::Other, "client disconnected"));
Poll::Ready(err)
}
_ => unreachable!(),
}
}
fn poll_shutdown(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> Poll<std::io::Result<()>> {
Poll::Ready(Ok(()))
}
}