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use std::future::Future;
use std::marker::PhantomData;
use std::pin::Pin;
use std::task::{Context, Poll};
pub use open_ssl::ssl::{AlpnError, SslAcceptor, SslAcceptorBuilder};
pub use tokio_openssl::{HandshakeError, SslStream};
use actix_codec::{AsyncRead, AsyncWrite};
use actix_service::{Service, ServiceFactory};
use actix_utils::counter::{Counter, CounterGuard};
use futures::future::{ok, FutureExt, LocalBoxFuture, Ready};
use crate::MAX_CONN_COUNTER;
pub struct Acceptor<T: AsyncRead + AsyncWrite> {
acceptor: SslAcceptor,
io: PhantomData<T>,
}
impl<T: AsyncRead + AsyncWrite> Acceptor<T> {
pub fn new(acceptor: SslAcceptor) -> Self {
Acceptor {
acceptor,
io: PhantomData,
}
}
}
impl<T: AsyncRead + AsyncWrite> Clone for Acceptor<T> {
fn clone(&self) -> Self {
Self {
acceptor: self.acceptor.clone(),
io: PhantomData,
}
}
}
impl<T: AsyncRead + AsyncWrite + Unpin + 'static> ServiceFactory for Acceptor<T> {
type Request = T;
type Response = SslStream<T>;
type Error = HandshakeError<T>;
type Config = ();
type Service = AcceptorService<T>;
type InitError = ();
type Future = Ready<Result<Self::Service, Self::InitError>>;
fn new_service(&self, _: ()) -> Self::Future {
MAX_CONN_COUNTER.with(|conns| {
ok(AcceptorService {
acceptor: self.acceptor.clone(),
conns: conns.clone(),
io: PhantomData,
})
})
}
}
pub struct AcceptorService<T> {
acceptor: SslAcceptor,
conns: Counter,
io: PhantomData<T>,
}
impl<T: AsyncRead + AsyncWrite + Unpin + 'static> Service for AcceptorService<T> {
type Request = T;
type Response = SslStream<T>;
type Error = HandshakeError<T>;
type Future = AcceptorServiceResponse<T>;
fn poll_ready(&mut self, ctx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
if self.conns.available(ctx) {
Poll::Ready(Ok(()))
} else {
Poll::Pending
}
}
fn call(&mut self, req: Self::Request) -> Self::Future {
let acc = self.acceptor.clone();
AcceptorServiceResponse {
_guard: self.conns.get(),
fut: async move {
let acc = acc;
tokio_openssl::accept(&acc, req).await
}
.boxed_local(),
}
}
}
pub struct AcceptorServiceResponse<T>
where
T: AsyncRead + AsyncWrite,
{
fut: LocalBoxFuture<'static, Result<SslStream<T>, HandshakeError<T>>>,
_guard: CounterGuard,
}
impl<T: AsyncRead + AsyncWrite + Unpin> Future for AcceptorServiceResponse<T> {
type Output = Result<SslStream<T>, HandshakeError<T>>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let io = futures::ready!(Pin::new(&mut self.fut).poll(cx))?;
Poll::Ready(Ok(io))
}
}