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//! Stub types to provide in place of an unimplemented TLS server-side implementation.
use std::{borrow::Cow, io::Result as IoResult, pin::Pin, task::Context};
use async_trait::async_trait;
use futures::{AsyncRead, AsyncWrite};
use crate::{CertifiedConn, StreamOps, tls::TlsConnector};
/// A [`TlsConnector`] or stream that can never be constructed or returned.
#[derive(Clone, Debug)]
pub struct UnimplementedTls(void::Void);
#[async_trait]
impl<S: Send + 'static> TlsConnector<S> for UnimplementedTls {
type Conn = UnimplementedTls;
async fn negotiate_unvalidated(&self, _stream: S, _sni_hostname: &str) -> IoResult<Self::Conn> {
void::unreachable(self.0)
}
}
impl CertifiedConn for UnimplementedTls {
fn export_keying_material(
&self,
_len: usize,
_label: &[u8],
_context: Option<&[u8]>,
) -> IoResult<Vec<u8>> {
void::unreachable(self.0)
}
fn peer_certificate(&self) -> IoResult<Option<Cow<'_, [u8]>>> {
void::unreachable(self.0)
}
fn own_certificate(&self) -> IoResult<Option<Cow<'_, [u8]>>> {
void::unreachable(self.0)
}
}
impl AsyncRead for UnimplementedTls {
fn poll_read(
self: Pin<&mut Self>,
_cx: &mut Context<'_>,
_buf: &mut [u8],
) -> std::task::Poll<IoResult<usize>> {
void::unreachable(self.0)
}
}
impl AsyncWrite for UnimplementedTls {
fn poll_write(
self: Pin<&mut Self>,
_cx: &mut Context<'_>,
_buf: &[u8],
) -> std::task::Poll<IoResult<usize>> {
void::unreachable(self.0)
}
fn poll_flush(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> std::task::Poll<IoResult<()>> {
void::unreachable(self.0)
}
fn poll_close(self: Pin<&mut Self>, _cx: &mut Context<'_>) -> std::task::Poll<IoResult<()>> {
void::unreachable(self.0)
}
}
impl StreamOps for UnimplementedTls {
fn set_tcp_notsent_lowat(&self, _notsent_lowat: u32) -> IoResult<()> {
void::unreachable(self.0)
}
fn new_handle(&self) -> Box<dyn StreamOps + Send + Unpin> {
void::unreachable(self.0)
}
}
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