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use crate::net::unix::UnixStream;
use crate::net::util::PollEvented;
use futures_core::ready;
use futures_util::future::poll_fn;
use mio::Ready;
use mio_uds;
use std::convert::TryFrom;
use std::fmt;
use std::io;
use std::os::unix::io::{AsRawFd, RawFd};
use std::os::unix::net::{self, SocketAddr};
use std::path::Path;
use std::task::{Context, Poll};
/// A Unix socket which can accept connections from other Unix sockets.
pub struct UnixListener {
io: PollEvented<mio_uds::UnixListener>,
}
impl UnixListener {
/// Creates a new `UnixListener` bound to the specified path.
pub fn bind<P>(path: P) -> io::Result<UnixListener>
where
P: AsRef<Path>,
{
let listener = mio_uds::UnixListener::bind(path)?;
let io = PollEvented::new(listener)?;
Ok(UnixListener { io })
}
/// Consumes a `UnixListener` in the standard library and returns a
/// nonblocking `UnixListener` from this crate.
///
/// The returned listener will be associated with the given event loop
/// specified by `handle` and is ready to perform I/O.
pub fn from_std(listener: net::UnixListener) -> io::Result<UnixListener> {
let listener = mio_uds::UnixListener::from_listener(listener)?;
let io = PollEvented::new(listener)?;
Ok(UnixListener { io })
}
/// Returns the local socket address of this listener.
pub fn local_addr(&self) -> io::Result<SocketAddr> {
self.io.get_ref().local_addr()
}
/// Returns the value of the `SO_ERROR` option.
pub fn take_error(&self) -> io::Result<Option<io::Error>> {
self.io.get_ref().take_error()
}
/// Accepts a new incoming connection to this listener.
pub async fn accept(&mut self) -> io::Result<(UnixStream, SocketAddr)> {
poll_fn(|cx| self.poll_accept(cx)).await
}
pub(crate) fn poll_accept(
&mut self,
cx: &mut Context<'_>,
) -> Poll<io::Result<(UnixStream, SocketAddr)>> {
let (io, addr) = ready!(self.poll_accept_std(cx))?;
let io = mio_uds::UnixStream::from_stream(io)?;
Ok((UnixStream::new(io)?, addr)).into()
}
fn poll_accept_std(
&mut self,
cx: &mut Context<'_>,
) -> Poll<io::Result<(net::UnixStream, SocketAddr)>> {
ready!(self.io.poll_read_ready(cx, Ready::readable()))?;
match self.io.get_ref().accept_std() {
Ok(None) => {
self.io.clear_read_ready(cx, Ready::readable())?;
Poll::Pending
}
Ok(Some((sock, addr))) => Ok((sock, addr)).into(),
Err(ref err) if err.kind() == io::ErrorKind::WouldBlock => {
self.io.clear_read_ready(cx, Ready::readable())?;
Poll::Pending
}
Err(err) => Err(err).into(),
}
}
/// Consumes this listener, returning a stream of the sockets this listener
/// accepts.
///
/// This method returns an implementation of the `Stream` trait which
/// resolves to the sockets the are accepted on this listener.
#[cfg(feature = "async-traits")]
pub fn incoming(self) -> super::Incoming {
super::Incoming::new(self)
}
}
impl TryFrom<UnixListener> for mio_uds::UnixListener {
type Error = io::Error;
/// Consumes value, returning the mio I/O object.
///
/// See [`PollEvented::into_inner`] for more details about
/// resource deregistration that happens during the call.
///
/// [`PollEvented::into_inner`]: crate::util::PollEvented::into_inner
fn try_from(value: UnixListener) -> Result<Self, Self::Error> {
value.io.into_inner()
}
}
impl TryFrom<net::UnixListener> for UnixListener {
type Error = io::Error;
/// Consumes stream, returning the tokio I/O object.
///
/// This is equivalent to
/// [`UnixListener::from_std(stream)`](UnixListener::from_std).
fn try_from(stream: net::UnixListener) -> io::Result<Self> {
Self::from_std(stream)
}
}
impl fmt::Debug for UnixListener {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
self.io.get_ref().fmt(f)
}
}
impl AsRawFd for UnixListener {
fn as_raw_fd(&self) -> RawFd {
self.io.get_ref().as_raw_fd()
}
}
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