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async_io.rs
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async_io.rs
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// Copyright 2020 Parity Technologies (UK) Ltd.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
use super::{Incoming, Provider};
use async_io_crate::Async;
use futures::future::{BoxFuture, FutureExt};
use std::io;
use std::net;
use std::task::{Context, Poll};
#[derive(Copy, Clone)]
pub enum Tcp {}
impl Provider for Tcp {
type Stream = Async<net::TcpStream>;
type Listener = Async<net::TcpListener>;
fn new_listener(l: net::TcpListener) -> io::Result<Self::Listener> {
Async::new(l)
}
fn new_stream(s: net::TcpStream) -> BoxFuture<'static, io::Result<Self::Stream>> {
async move {
// Taken from [`Async::connect`].
let stream = Async::new(s)?;
// The stream becomes writable when connected.
stream.writable().await?;
// Check if there was an error while connecting.
match stream.get_ref().take_error()? {
None => Ok(stream),
Some(err) => Err(err),
}
}
.boxed()
}
fn poll_accept(
l: &mut Self::Listener,
cx: &mut Context<'_>,
) -> Poll<io::Result<Incoming<Self::Stream>>> {
let (stream, remote_addr) = loop {
match l.poll_readable(cx) {
Poll::Pending => return Poll::Pending,
Poll::Ready(Err(err)) => return Poll::Ready(Err(err)),
Poll::Ready(Ok(())) => match l.accept().now_or_never() {
Some(Err(e)) => return Poll::Ready(Err(e)),
Some(Ok(res)) => break res,
None => {
// Since it doesn't do any harm, account for false positives of
// `poll_readable` just in case, i.e. try again.
}
},
}
};
let local_addr = stream.get_ref().local_addr()?;
Poll::Ready(Ok(Incoming {
stream,
local_addr,
remote_addr,
}))
}
}