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//! Support for streams and listeners on `general::SocketAddr`.
use async_trait::async_trait;
use futures::{AsyncRead, AsyncWrite, StreamExt as _, stream};
use std::io::{Error as IoError, ErrorKind as IoErrorKind, Result as IoResult};
use std::net;
use std::task::Poll;
use std::{pin::Pin, task::Context};
use tor_general_addr::unix;
use tracing::instrument;
use crate::{NetStreamListener, NetStreamProvider, StreamOps};
use tor_general_addr::general;
pub use general::{AddrParseError, SocketAddr};
/// Helper trait to allow us to create a type-erased stream.
///
/// (Rust doesn't allow "dyn AsyncRead + AsyncWrite")
trait ReadAndWrite: AsyncRead + AsyncWrite + StreamOps + Send + Sync {}
impl<T> ReadAndWrite for T where T: AsyncRead + AsyncWrite + StreamOps + Send + Sync {}
/// A stream returned by a `NetStreamProvider<GeneralizedAddr>`
pub struct Stream(Pin<Box<dyn ReadAndWrite>>);
impl AsyncRead for Stream {
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut Context<'_>,
buf: &mut [u8],
) -> Poll<IoResult<usize>> {
self.0.as_mut().poll_read(cx, buf)
}
impl AsyncWrite for Stream {
fn poll_write(
buf: &[u8],
self.0.as_mut().poll_write(cx, buf)
fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<IoResult<()>> {
self.0.as_mut().poll_flush(cx)
fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<IoResult<()>> {
self.0.as_mut().poll_close(cx)
impl StreamOps for Stream {
fn set_tcp_notsent_lowat(&self, notsent_lowat: u32) -> IoResult<()> {
self.0.set_tcp_notsent_lowat(notsent_lowat)
fn new_handle(&self) -> Box<dyn StreamOps + Send + Unpin> {
self.0.new_handle()
/// The type of the result from an [`IncomingStreams`].
type StreamItem = IoResult<(Stream, general::SocketAddr)>;
/// A stream of incoming connections on a [`general::Listener`](Listener).
pub struct IncomingStreams(Pin<Box<dyn stream::Stream<Item = StreamItem> + Send + Sync>>);
impl stream::Stream for IncomingStreams {
type Item = IoResult<(Stream, general::SocketAddr)>;
fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
self.0.as_mut().poll_next(cx)
/// A listener returned by a `NetStreamProvider<general::SocketAddr>`.
pub struct Listener {
/// The `futures::Stream` of incoming network streams.
streams: IncomingStreams,
/// The local address on which we're listening.
local_addr: general::SocketAddr,
impl NetStreamListener<general::SocketAddr> for Listener {
type Stream = Stream;
type Incoming = IncomingStreams;
fn incoming(self) -> IncomingStreams {
self.streams
fn local_addr(&self) -> IoResult<general::SocketAddr> {
Ok(self.local_addr.clone())
/// Use `provider` to launch a `NetStreamListener` at `address`, and wrap that listener
/// as a `Listener`.
async fn abstract_listener_on<ADDR, P>(provider: &P, address: &ADDR) -> IoResult<Listener>
where
P: NetStreamProvider<ADDR>,
general::SocketAddr: From<ADDR>,
{
let lis = provider.listen(address).await?;
let local_addr = general::SocketAddr::from(lis.local_addr()?);
let streams = lis.incoming().map(|result| {
result.map(|(socket, addr)| (Stream(Box::pin(socket)), general::SocketAddr::from(addr)))
});
let streams = IncomingStreams(Box::pin(streams));
Ok(Listener {
streams,
local_addr,
})
#[async_trait]
impl<T> NetStreamProvider<general::SocketAddr> for T
T: NetStreamProvider<net::SocketAddr> + NetStreamProvider<unix::SocketAddr>,
type Listener = Listener;
#[instrument(skip_all, level = "trace")]
async fn connect(&self, addr: &general::SocketAddr) -> IoResult<Stream> {
use general::SocketAddr as G;
match addr {
G::Inet(a) => Ok(Stream(Box::pin(self.connect(a).await?))),
G::Unix(a) => Ok(Stream(Box::pin(self.connect(a).await?))),
other => Err(IoError::new(
IoErrorKind::InvalidInput,
UnsupportedAddress(other.clone()),
)),
async fn listen(&self, addr: &general::SocketAddr) -> IoResult<Listener> {
G::Inet(a) => abstract_listener_on(self, a).await,
G::Unix(a) => abstract_listener_on(self, a).await,
/// Tried to use a [`general::SocketAddr`] that `tor-rtcompat` didn't understand.
#[derive(Clone, Debug, thiserror::Error)]
#[error("Socket address {0:?} is not supported by tor-rtcompat")]
pub struct UnsupportedAddress(general::SocketAddr);