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async-tungstenite/src/stream.rs

88 lines
2.6 KiB

//! Convenience wrapper for streams to switch between plain TCP and TLS at runtime.
//!
//! There is no dependency on actual TLS implementations. Everything like
//! `native_tls` or `openssl` will work as long as there is a TLS stream supporting standard
//! `Read + Write` traits.
use std::pin::Pin;
use std::task::{Context, Poll};
use tokio_io::{AsyncRead, AsyncWrite};
/// Stream, either plain TCP or TLS.
pub enum Stream<S, T> {
/// Unencrypted socket stream.
Plain(S),
/// Encrypted socket stream.
Tls(T),
}
impl<S: AsyncRead + Unpin, T: AsyncRead + Unpin> AsyncRead for Stream<S, T> {
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<std::io::Result<usize>> {
match *self {
Stream::Plain(ref mut s) => {
let pinned = unsafe { Pin::new_unchecked(s) };
pinned.poll_read(cx, buf)
}
Stream::Tls(ref mut s) => {
let pinned = unsafe { Pin::new_unchecked(s) };
pinned.poll_read(cx, buf)
}
}
}
}
impl<S: AsyncWrite + Unpin, T: AsyncWrite + Unpin> AsyncWrite for Stream<S, T> {
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<Result<usize, std::io::Error>> {
match *self {
Stream::Plain(ref mut s) => {
let pinned = unsafe { Pin::new_unchecked(s) };
pinned.poll_write(cx, buf)
}
Stream::Tls(ref mut s) => {
let pinned = unsafe { Pin::new_unchecked(s) };
pinned.poll_write(cx, buf)
}
}
}
fn poll_flush(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), std::io::Error>> {
match *self {
Stream::Plain(ref mut s) => {
let pinned = unsafe { Pin::new_unchecked(s) };
pinned.poll_flush(cx)
}
Stream::Tls(ref mut s) => {
let pinned = unsafe { Pin::new_unchecked(s) };
pinned.poll_flush(cx)
}
}
}
fn poll_shutdown(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), std::io::Error>> {
match *self {
Stream::Plain(ref mut s) => {
let pinned = unsafe { Pin::new_unchecked(s) };
pinned.poll_shutdown(cx)
}
Stream::Tls(ref mut s) => {
let pinned = unsafe { Pin::new_unchecked(s) };
pinned.poll_shutdown(cx)
}
}
}
}