1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114

use std::marker::PhantomData;
use std::task::{Context, Poll};

use requiem_codec::{AsyncRead, AsyncWrite};
use requiem_service::{Service, ServiceFactory};
use requiem_utils::counter::Counter;
use futures::future::{self, FutureExt, LocalBoxFuture, TryFutureExt};
pub use native_tls::Error;
pub use tokio_tls::{TlsAcceptor, TlsStream};

use crate::MAX_CONN_COUNTER;

/// Support `SSL` connections via native-tls package
///
/// `tls` feature enables `NativeTlsAcceptor` type
pub struct NativeTlsAcceptor<T> {
    acceptor: TlsAcceptor,
    io: PhantomData<T>,
}

impl<T> NativeTlsAcceptor<T>
where
    T: AsyncRead + AsyncWrite + Unpin,
{
    /// Create `NativeTlsAcceptor` instance
    #[inline]
    pub fn new(acceptor: TlsAcceptor) -> Self {
        NativeTlsAcceptor {
            acceptor,
            io: PhantomData,
        }
    }
}

impl<T> Clone for NativeTlsAcceptor<T> {
    #[inline]
    fn clone(&self) -> Self {
        Self {
            acceptor: self.acceptor.clone(),
            io: PhantomData,
        }
    }
}

impl<T> ServiceFactory for NativeTlsAcceptor<T>
where
    T: AsyncRead + AsyncWrite + Unpin + 'static,
{
    type Request = T;
    type Response = TlsStream<T>;
    type Error = Error;
    type Service = NativeTlsAcceptorService<T>;

    type Config = ();
    type InitError = ();
    type Future = future::Ready<Result<Self::Service, Self::InitError>>;

    fn new_service(&self, _: ()) -> Self::Future {
        MAX_CONN_COUNTER.with(|conns| {
            future::ok(NativeTlsAcceptorService {
                acceptor: self.acceptor.clone(),
                conns: conns.clone(),
                io: PhantomData,
            })
        })
    }
}

pub struct NativeTlsAcceptorService<T> {
    acceptor: TlsAcceptor,
    io: PhantomData<T>,
    conns: Counter,
}

impl<T> Clone for NativeTlsAcceptorService<T> {
    fn clone(&self) -> Self {
        Self {
            acceptor: self.acceptor.clone(),
            io: PhantomData,
            conns: self.conns.clone(),
        }
    }
}

impl<T> Service for NativeTlsAcceptorService<T>
where
    T: AsyncRead + AsyncWrite + Unpin + 'static,
{
    type Request = T;
    type Response = TlsStream<T>;
    type Error = Error;
    type Future = LocalBoxFuture<'static, Result<TlsStream<T>, Error>>;

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

    fn call(&mut self, req: Self::Request) -> Self::Future {
        let guard = self.conns.get();
        let this = self.clone();
        async move { this.acceptor.accept(req).await }
            .map_ok(move |io| {
                // Required to preserve `CounterGuard` until `Self::Future`
                // is completely resolved.
                let _ = guard;
                io
            })
            .boxed_local()
    }
}