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stream.rs
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stream.rs
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//! 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 pin_project::{pin_project, project};
use std::pin::Pin;
use std::task::{Context, Poll};
use tokio::io::{AsyncRead, AsyncWrite};
/// Stream, either plain TCP or TLS.
#[pin_project]
pub enum Stream<S, T> {
/// Unencrypted socket stream.
Plain(#[pin] S),
/// Encrypted socket stream.
Tls(#[pin] T),
}
impl<S: AsyncRead, T: AsyncRead> AsyncRead for Stream<S, T> {
#[project]
fn poll_read(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<std::io::Result<usize>> {
#[project]
match self.project() {
Stream::Plain(s) => s.poll_read(cx, buf),
Stream::Tls(s) => s.poll_read(cx, buf),
}
}
}
impl<S: AsyncWrite, T: AsyncWrite> AsyncWrite for Stream<S, T> {
#[project]
fn poll_write(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &[u8],
) -> Poll<Result<usize, std::io::Error>> {
#[project]
match self.project() {
Stream::Plain(s) => s.poll_write(cx, buf),
Stream::Tls(s) => s.poll_write(cx, buf),
}
}
#[project]
fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), std::io::Error>> {
#[project]
match self.project() {
Stream::Plain(s) => s.poll_flush(cx),
Stream::Tls(s) => s.poll_flush(cx),
}
}
#[project]
fn poll_shutdown(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<(), std::io::Error>> {
#[project]
match self.project() {
Stream::Plain(s) => s.poll_shutdown(cx),
Stream::Tls(s) => s.poll_shutdown(cx),
}
}
}