1use std::mem;
2use std::pin::Pin;
3
4use openssl::ssl::{self, ConnectConfiguration, SslConnector};
5
6use futures::io::{AsyncRead, AsyncWrite};
7use futures::prelude::*;
8use futures::task::{Context, Poll};
9
10use async_stdio::*;
11
12use crate::{HandshakeError, MidHandshakeSslStream, SslStream};
13
14pub trait SslConnectorExt {
17 fn connect_async<S: AsyncRead + AsyncWrite>(&self, domain: &str, stream: S) -> ConnectAsync<S>;
19}
20
21pub trait ConnectConfigurationExt {
24 fn connect_async<S: AsyncRead + AsyncWrite>(self, domain: &str, stream: S) -> ConnectAsync<S>;
26}
27
28impl ConnectConfigurationExt for ConnectConfiguration {
29 fn connect_async<S: AsyncRead + AsyncWrite>(self, domain: &str, stream: S) -> ConnectAsync<S> {
30 ConnectAsync(ConnectInner::Init(self, domain.into(), stream))
31 }
32}
33
34impl SslConnectorExt for SslConnector {
35 fn connect_async<S: AsyncRead + AsyncWrite>(&self, domain: &str, stream: S) -> ConnectAsync<S> {
36 match self.configure() {
37 Ok(s) => s.connect_async(domain, stream),
38 Err(e) => ConnectAsync(ConnectInner::Error(HandshakeError::SetupFailure(e))),
39 }
40 }
41}
42
43pub struct ConnectAsync<S>(ConnectInner<S>);
47
48enum ConnectInner<S> {
49 Init(ConnectConfiguration, String, S),
50 Handshake(MidHandshakeSslStream<S>),
51 Error(HandshakeError<S>),
52 Done,
53}
54
55impl<S: AsyncRead + AsyncWrite + Unpin> Future for ConnectAsync<S> {
56 type Output = Result<SslStream<S>, HandshakeError<S>>;
57
58 fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
59 let this = Pin::get_mut(self);
60
61 match mem::replace(&mut this.0, ConnectInner::Done) {
62 ConnectInner::Init(config, domain, stream) => {
63 let (stream, ctrl) = AsStdIo::new(stream, cx.waker().into());
64 match config.connect(&domain, stream) {
65 Ok(inner) => Poll::Ready(Ok(SslStream { inner, ctrl })),
66 Err(ssl::HandshakeError::WouldBlock(inner)) => {
67 this.0 = ConnectInner::Handshake(MidHandshakeSslStream::new(inner, ctrl));
68 Poll::Pending
69 }
70 Err(e) => Poll::Ready(Err(HandshakeError::from_ssl(e, ctrl).unwrap())),
71 }
72 }
73 ConnectInner::Handshake(mut handshake) => match Pin::new(&mut handshake).poll(cx) {
74 Poll::Ready(result) => Poll::Ready(result),
75 Poll::Pending => {
76 this.0 = ConnectInner::Handshake(handshake);
77 Poll::Pending
78 }
79 },
80 ConnectInner::Error(e) => Poll::Ready(Err(e)),
81 ConnectInner::Done => panic!("accept polled after completion"),
82 }
83 }
84}