ntex-tls 0.2.4

An implementation of SSL streams for ntex backed by OpenSSL
Documentation 
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use std::task::{Context, Poll};
use std::{future::Future, io, marker::PhantomData, pin::Pin, sync::Arc};

use tls_rust::ServerConfig;

use ntex_io::{Filter, FilterFactory, Io, Layer};
use ntex_service::{Service, ServiceFactory};
use ntex_util::{future::Ready, time::Millis};

use super::{TlsAcceptor, TlsFilter};
use crate::{counter::Counter, counter::CounterGuard, MAX_SSL_ACCEPT_COUNTER};

/// Support `SSL` connections via rustls package
///
/// `rust-tls` feature enables `RustlsAcceptor` type
pub struct Acceptor<F> {
    inner: TlsAcceptor,
    _t: PhantomData<F>,
}

impl<F> Acceptor<F> {
    /// Create rustls based `Acceptor` service factory
    pub fn new(config: Arc<ServerConfig>) -> Self {
        Acceptor {
            inner: TlsAcceptor::new(config),
            _t: PhantomData,
        }
    }

    /// Set handshake timeout.
    ///
    /// Default is set to 5 seconds.
    pub fn timeout<U: Into<Millis>>(mut self, timeout: U) -> Self {
        self.inner.timeout(timeout.into());
        self
    }
}

impl<F> From<ServerConfig> for Acceptor<F> {
    fn from(cfg: ServerConfig) -> Self {
        Self::new(Arc::new(cfg))
    }
}

impl<F> Clone for Acceptor<F> {
    fn clone(&self) -> Self {
        Self {
            inner: self.inner.clone(),
            _t: PhantomData,
        }
    }
}

impl<F: Filter, C: 'static> ServiceFactory<Io<F>, C> for Acceptor<F> {
    type Response = Io<Layer<TlsFilter, F>>;
    type Error = io::Error;
    type Service = AcceptorService<F>;

    type InitError = ();
    type Future<'f> = Ready<Self::Service, Self::InitError> where Self: 'f, C: 'f;

    #[inline]
    fn create(&self, _: C) -> Self::Future<'_> {
        MAX_SSL_ACCEPT_COUNTER.with(|conns| {
            Ready::Ok(AcceptorService {
                acceptor: self.inner.clone(),
                conns: conns.clone(),
                io: PhantomData,
            })
        })
    }
}

/// RusTLS based `Acceptor` service
pub struct AcceptorService<F> {
    acceptor: TlsAcceptor,
    io: PhantomData<F>,
    conns: Counter,
}

impl<F: Filter> Service<Io<F>> for AcceptorService<F> {
    type Response = Io<Layer<TlsFilter, F>>;
    type Error = io::Error;
    type Future<'f> = AcceptorServiceFut<F>;

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

    #[inline]
    fn call(&self, req: Io<F>) -> Self::Future<'_> {
        AcceptorServiceFut {
            _guard: self.conns.get(),
            fut: self.acceptor.clone().create(req),
        }
    }
}

pin_project_lite::pin_project! {
    pub struct AcceptorServiceFut<F>
    where
        F: Filter,
    {
        #[pin]
        fut: <TlsAcceptor as FilterFactory<F>>::Future,
        _guard: CounterGuard,
    }
}

impl<F: Filter> Future for AcceptorServiceFut<F> {
    type Output = Result<Io<Layer<TlsFilter, F>>, io::Error>;

    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        self.project().fut.poll(cx)
    }
}