#
actix_tls/accept/
rustls_0_20.rs

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    //! `rustls` v0.20 based TLS connection acceptor service.
    //!
    //! See [`Acceptor`] for main service factory docs.

    use std::{
        convert::Infallible,
        future::Future,
        io::{self, IoSlice},
        pin::Pin,
        sync::Arc,
        task::{Context, Poll},
        time::Duration,
    };

    use actix_rt::{
        net::{ActixStream, Ready},
        time::{sleep, Sleep},
    };
    use actix_service::{Service, ServiceFactory};
    use actix_utils::{
        counter::{Counter, CounterGuard},
        future::{ready, Ready as FutReady},
    };
    use pin_project_lite::pin_project;
    use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
    use tokio_rustls::{Accept, TlsAcceptor};
    use tokio_rustls_023 as tokio_rustls;

    use super::{TlsError, DEFAULT_TLS_HANDSHAKE_TIMEOUT, MAX_CONN_COUNTER};

    pub mod reexports {
        //! Re-exports from `rustls` that are useful for acceptors.

        pub use tokio_rustls_023::rustls::ServerConfig;
    }

    /// Wraps a `rustls` based async TLS stream in order to implement [`ActixStream`].
    pub struct TlsStream<IO>(tokio_rustls::server::TlsStream<IO>);

    impl_more::impl_from!(<IO> in tokio_rustls::server::TlsStream<IO> => TlsStream<IO>);
    impl_more::impl_deref_and_mut!(<IO> in TlsStream<IO> => tokio_rustls::server::TlsStream<IO>);

    impl<IO: ActixStream> AsyncRead for TlsStream<IO> {
        fn poll_read(
            self: Pin<&mut Self>,
            cx: &mut Context<'_>,
            buf: &mut ReadBuf<'_>,
        ) -> Poll<io::Result<()>> {
            Pin::new(&mut **self.get_mut()).poll_read(cx, buf)
        }
    }

    impl<IO: ActixStream> AsyncWrite for TlsStream<IO> {
        fn poll_write(
            self: Pin<&mut Self>,
            cx: &mut Context<'_>,
            buf: &[u8],
        ) -> Poll<io::Result<usize>> {
            Pin::new(&mut **self.get_mut()).poll_write(cx, buf)
        }

        fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
            Pin::new(&mut **self.get_mut()).poll_flush(cx)
        }

        fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
            Pin::new(&mut **self.get_mut()).poll_shutdown(cx)
        }

        fn poll_write_vectored(
            self: Pin<&mut Self>,
            cx: &mut Context<'_>,
            bufs: &[IoSlice<'_>],
        ) -> Poll<io::Result<usize>> {
            Pin::new(&mut **self.get_mut()).poll_write_vectored(cx, bufs)
        }

        fn is_write_vectored(&self) -> bool {
            (**self).is_write_vectored()
        }
    }

    impl<IO: ActixStream> ActixStream for TlsStream<IO> {
        fn poll_read_ready(&self, cx: &mut Context<'_>) -> Poll<io::Result<Ready>> {
            IO::poll_read_ready((**self).get_ref().0, cx)
        }

        fn poll_write_ready(&self, cx: &mut Context<'_>) -> Poll<io::Result<Ready>> {
            IO::poll_write_ready((**self).get_ref().0, cx)
        }
    }

    /// Accept TLS connections via the `rustls` crate.
    pub struct Acceptor {
        config: Arc<reexports::ServerConfig>,
        handshake_timeout: Duration,
    }

    impl Acceptor {
        /// Constructs `rustls` based acceptor service factory.
        pub fn new(config: reexports::ServerConfig) -> Self {
            Acceptor {
                config: Arc::new(config),
                handshake_timeout: DEFAULT_TLS_HANDSHAKE_TIMEOUT,
            }
        }

        /// Limit the amount of time that the acceptor will wait for a TLS handshake to complete.
        ///
        /// Default timeout is 3 seconds.
        pub fn set_handshake_timeout(&mut self, handshake_timeout: Duration) -> &mut Self {
            self.handshake_timeout = handshake_timeout;
            self
        }
    }

    impl Clone for Acceptor {
        fn clone(&self) -> Self {
            Self {
                config: self.config.clone(),
                handshake_timeout: self.handshake_timeout,
            }
        }
    }

    impl<IO: ActixStream> ServiceFactory<IO> for Acceptor {
        type Response = TlsStream<IO>;
        type Error = TlsError<io::Error, Infallible>;
        type Config = ();
        type Service = AcceptorService;
        type InitError = ();
        type Future = FutReady<Result<Self::Service, Self::InitError>>;

        fn new_service(&self, _: ()) -> Self::Future {
            let res = MAX_CONN_COUNTER.with(|conns| {
                Ok(AcceptorService {
                    acceptor: self.config.clone().into(),
                    conns: conns.clone(),
                    handshake_timeout: self.handshake_timeout,
                })
            });

            ready(res)
        }
    }

    /// Rustls based acceptor service.
    pub struct AcceptorService {
        acceptor: TlsAcceptor,
        conns: Counter,
        handshake_timeout: Duration,
    }

    impl<IO: ActixStream> Service<IO> for AcceptorService {
        type Response = TlsStream<IO>;
        type Error = TlsError<io::Error, Infallible>;
        type Future = AcceptFut<IO>;

        fn poll_ready(&self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
            if self.conns.available(cx) {
                Poll::Ready(Ok(()))
            } else {
                Poll::Pending
            }
        }

        fn call(&self, req: IO) -> Self::Future {
            AcceptFut {
                fut: self.acceptor.accept(req),
                timeout: sleep(self.handshake_timeout),
                _guard: self.conns.get(),
            }
        }
    }

    pin_project! {
        /// Accept future for Rustls service.
        #[doc(hidden)]
        pub struct AcceptFut<IO: ActixStream> {
            fut: Accept<IO>,
            #[pin]
            timeout: Sleep,
            _guard: CounterGuard,
        }
    }

    impl<IO: ActixStream> Future for AcceptFut<IO> {
        type Output = Result<TlsStream<IO>, TlsError<io::Error, Infallible>>;

        fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
            let mut this = self.project();
            match Pin::new(&mut this.fut).poll(cx) {
                Poll::Ready(Ok(stream)) => Poll::Ready(Ok(TlsStream(stream))),
                Poll::Ready(Err(err)) => Poll::Ready(Err(TlsError::Tls(err))),
                Poll::Pending => this.timeout.poll(cx).map(|_| Err(TlsError::Timeout)),
            }
        }
    }