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use std::marker::PhantomData; use std::rc::Rc; use actix_service::{IntoService, NewService, Service}; use futures::unsync::mpsc; use futures::{Async, Future, Poll, Stream}; type Request<T> = Result<<T as IntoStream>::Item, <T as IntoStream>::Error>; pub trait IntoStream { type Item; type Error; type Stream: Stream<Item = Self::Item, Error = Self::Error>; fn into_stream(self) -> Self::Stream; } impl<T> IntoStream for T where T: Stream, { type Item = T::Item; type Error = T::Error; type Stream = T; fn into_stream(self) -> Self::Stream { self } } pub struct StreamService<S, T: NewService, E> { factory: Rc<T>, config: T::Config, _t: PhantomData<(S, E)>, } impl<S, T, E> Service for StreamService<S, T, E> where S: IntoStream + 'static, T: NewService<Request = Request<S>, Response = (), Error = E, InitError = E>, T::Future: 'static, T::Service: 'static, <T::Service as Service>::Future: 'static, { type Request = S; type Response = (); type Error = E; type Future = Box<dyn Future<Item = (), Error = E>>; fn poll_ready(&mut self) -> Poll<(), Self::Error> { Ok(Async::Ready(())) } fn call(&mut self, req: S) -> Self::Future { Box::new( self.factory .new_service(&self.config) .and_then(move |srv| StreamDispatcher::new(req, srv)), ) } } pub struct StreamDispatcher<S, T> where S: IntoStream + 'static, T: Service<Request = Request<S>, Response = ()> + 'static, T::Future: 'static, { stream: S, service: T, err_rx: mpsc::UnboundedReceiver<T::Error>, err_tx: mpsc::UnboundedSender<T::Error>, } impl<S, T> StreamDispatcher<S, T> where S: Stream, T: Service<Request = Request<S>, Response = ()>, T::Future: 'static, { pub fn new<F1, F2>(stream: F1, service: F2) -> Self where F1: IntoStream<Stream = S, Item = S::Item, Error = S::Error>, F2: IntoService<T>, { let (err_tx, err_rx) = mpsc::unbounded(); StreamDispatcher { err_rx, err_tx, stream: stream.into_stream(), service: service.into_service(), } } } impl<S, T> Future for StreamDispatcher<S, T> where S: Stream, T: Service<Request = Request<S>, Response = ()>, T::Future: 'static, { type Item = (); type Error = T::Error; fn poll(&mut self) -> Poll<Self::Item, Self::Error> { if let Ok(Async::Ready(Some(e))) = self.err_rx.poll() { return Err(e); } loop { match self.service.poll_ready()? { Async::Ready(_) => match self.stream.poll() { Ok(Async::Ready(Some(item))) => { tokio_current_thread::spawn(StreamDispatcherService { fut: self.service.call(Ok(item)), stop: self.err_tx.clone(), }) } Err(err) => tokio_current_thread::spawn(StreamDispatcherService { fut: self.service.call(Err(err)), stop: self.err_tx.clone(), }), Ok(Async::NotReady) => return Ok(Async::NotReady), Ok(Async::Ready(None)) => return Ok(Async::Ready(())), }, Async::NotReady => return Ok(Async::NotReady), } } } } struct StreamDispatcherService<F: Future> { fut: F, stop: mpsc::UnboundedSender<F::Error>, } impl<F: Future> Future for StreamDispatcherService<F> { type Item = (); type Error = (); fn poll(&mut self) -> Poll<Self::Item, Self::Error> { match self.fut.poll() { Ok(Async::Ready(_)) => Ok(Async::Ready(())), Ok(Async::NotReady) => Ok(Async::NotReady), Err(e) => { let _ = self.stop.unbounded_send(e); Ok(Async::Ready(())) } } } }