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mirror of https://github.com/fafhrd91/actix-net synced 2024-11-24 03:42:59 +01:00
actix-net/actix-utils/src/stream.rs
2019-12-02 22:30:09 +06:00

101 lines
2.5 KiB
Rust

use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};
use actix_service::{IntoService, Service};
use futures::Stream;
use crate::mpsc;
#[pin_project::pin_project]
pub struct StreamDispatcher<S, T>
where
S: Stream,
T: Service<Request = S::Item, Response = ()> + 'static,
{
#[pin]
stream: S,
service: T,
err_rx: mpsc::Receiver<T::Error>,
err_tx: mpsc::Sender<T::Error>,
}
impl<S, T> StreamDispatcher<S, T>
where
S: Stream,
T: Service<Request = S::Item, Response = ()> + 'static,
{
pub fn new<F>(stream: S, service: F) -> Self
where
F: IntoService<T>,
{
let (err_tx, err_rx) = mpsc::channel();
StreamDispatcher {
err_rx,
err_tx,
stream,
service: service.into_service(),
}
}
}
impl<S, T> Future for StreamDispatcher<S, T>
where
S: Stream,
T: Service<Request = S::Item, Response = ()> + 'static,
{
type Output = Result<(), T::Error>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let mut this = self.as_mut().project();
if let Poll::Ready(Some(e)) = Pin::new(&mut this.err_rx).poll_next(cx) {
return Poll::Ready(Err(e));
}
loop {
match this.service.poll_ready(cx)? {
Poll::Ready(_) => match this.stream.poll_next(cx) {
Poll::Ready(Some(item)) => {
actix_rt::spawn(StreamDispatcherService {
fut: this.service.call(item),
stop: self.err_tx.clone(),
});
this = self.as_mut().project();
}
Poll::Pending => return Poll::Pending,
Poll::Ready(None) => return Poll::Ready(Ok(())),
},
Poll::Pending => return Poll::Pending,
}
}
}
}
#[pin_project::pin_project]
struct StreamDispatcherService<F: Future, E> {
#[pin]
fut: F,
stop: mpsc::Sender<E>,
}
impl<F, E> Future for StreamDispatcherService<F, E>
where
F: Future<Output = Result<(), E>>,
{
type Output = ();
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let this = self.project();
match this.fut.poll(cx) {
Poll::Ready(Ok(_)) => Poll::Ready(()),
Poll::Pending => Poll::Pending,
Poll::Ready(Err(e)) => {
let _ = this.stop.send(e);
Poll::Ready(())
}
}
}
}