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use std::fmt;
use std::io;
use std::net::{SocketAddr, TcpListener as StdTcpListener};
use std::time::Duration;
use tokio::net::TcpListener;
use tokio::time::Delay;
use crate::common::{task, Future, Pin, Poll};
pub use self::addr_stream::AddrStream;
use super::Accept;
#[must_use = "streams do nothing unless polled"]
pub struct AddrIncoming {
addr: SocketAddr,
listener: TcpListener,
sleep_on_errors: bool,
tcp_keepalive_timeout: Option<Duration>,
tcp_nodelay: bool,
timeout: Option<Delay>,
}
impl AddrIncoming {
pub(super) fn new(addr: &SocketAddr) -> crate::Result<Self> {
let std_listener = StdTcpListener::bind(addr).map_err(crate::Error::new_listen)?;
AddrIncoming::from_std(std_listener)
}
pub(super) fn from_std(std_listener: StdTcpListener) -> crate::Result<Self> {
let listener = TcpListener::from_std(std_listener).map_err(crate::Error::new_listen)?;
let addr = listener.local_addr().map_err(crate::Error::new_listen)?;
Ok(AddrIncoming {
listener,
addr,
sleep_on_errors: true,
tcp_keepalive_timeout: None,
tcp_nodelay: false,
timeout: None,
})
}
pub fn bind(addr: &SocketAddr) -> crate::Result<Self> {
AddrIncoming::new(addr)
}
pub fn local_addr(&self) -> SocketAddr {
self.addr
}
pub fn set_keepalive(&mut self, keepalive: Option<Duration>) -> &mut Self {
self.tcp_keepalive_timeout = keepalive;
self
}
pub fn set_nodelay(&mut self, enabled: bool) -> &mut Self {
self.tcp_nodelay = enabled;
self
}
pub fn set_sleep_on_errors(&mut self, val: bool) {
self.sleep_on_errors = val;
}
fn poll_next_(&mut self, cx: &mut task::Context<'_>) -> Poll<io::Result<AddrStream>> {
if let Some(ref mut to) = self.timeout {
ready!(Pin::new(to).poll(cx));
}
self.timeout = None;
loop {
match ready!(self.listener.poll_accept(cx)) {
Ok((socket, addr)) => {
if let Some(dur) = self.tcp_keepalive_timeout {
if let Err(e) = socket.set_keepalive(Some(dur)) {
trace!("error trying to set TCP keepalive: {}", e);
}
}
if let Err(e) = socket.set_nodelay(self.tcp_nodelay) {
trace!("error trying to set TCP nodelay: {}", e);
}
return Poll::Ready(Ok(AddrStream::new(socket, addr)));
}
Err(e) => {
if is_connection_error(&e) {
debug!("accepted connection already errored: {}", e);
continue;
}
if self.sleep_on_errors {
error!("accept error: {}", e);
let mut timeout = tokio::time::delay_for(Duration::from_secs(1));
match Pin::new(&mut timeout).poll(cx) {
Poll::Ready(()) => {
continue;
}
Poll::Pending => {
self.timeout = Some(timeout);
return Poll::Pending;
}
}
} else {
return Poll::Ready(Err(e));
}
}
}
}
}
}
impl Accept for AddrIncoming {
type Conn = AddrStream;
type Error = io::Error;
fn poll_accept(
mut self: Pin<&mut Self>,
cx: &mut task::Context<'_>,
) -> Poll<Option<Result<Self::Conn, Self::Error>>> {
let result = ready!(self.poll_next_(cx));
Poll::Ready(Some(result))
}
}
fn is_connection_error(e: &io::Error) -> bool {
match e.kind() {
io::ErrorKind::ConnectionRefused
| io::ErrorKind::ConnectionAborted
| io::ErrorKind::ConnectionReset => true,
_ => false,
}
}
impl fmt::Debug for AddrIncoming {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("AddrIncoming")
.field("addr", &self.addr)
.field("sleep_on_errors", &self.sleep_on_errors)
.field("tcp_keepalive_timeout", &self.tcp_keepalive_timeout)
.field("tcp_nodelay", &self.tcp_nodelay)
.finish()
}
}
mod addr_stream {
use bytes::{Buf, BufMut};
use std::io;
use std::net::SocketAddr;
#[cfg(unix)]
use std::os::unix::io::{AsRawFd, RawFd};
use tokio::io::{AsyncRead, AsyncWrite};
use tokio::net::TcpStream;
use crate::common::{task, Pin, Poll};
#[derive(Debug)]
pub struct AddrStream {
inner: TcpStream,
pub(super) remote_addr: SocketAddr,
}
impl AddrStream {
pub(super) fn new(tcp: TcpStream, addr: SocketAddr) -> AddrStream {
AddrStream {
inner: tcp,
remote_addr: addr,
}
}
#[inline]
pub fn remote_addr(&self) -> SocketAddr {
self.remote_addr
}
#[inline]
pub fn into_inner(self) -> TcpStream {
self.inner
}
pub fn poll_peek(
&mut self,
cx: &mut task::Context<'_>,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
self.inner.poll_peek(cx, buf)
}
}
impl AsyncRead for AddrStream {
unsafe fn prepare_uninitialized_buffer(
&self,
buf: &mut [std::mem::MaybeUninit<u8>],
) -> bool {
self.inner.prepare_uninitialized_buffer(buf)
}
#[inline]
fn poll_read(
mut self: Pin<&mut Self>,
cx: &mut task::Context<'_>,
buf: &mut [u8],
) -> Poll<io::Result<usize>> {
Pin::new(&mut self.inner).poll_read(cx, buf)
}
#[inline]
fn poll_read_buf<B: BufMut>(
mut self: Pin<&mut Self>,
cx: &mut task::Context<'_>,
buf: &mut B,
) -> Poll<io::Result<usize>> {
Pin::new(&mut self.inner).poll_read_buf(cx, buf)
}
}
impl AsyncWrite for AddrStream {
#[inline]
fn poll_write(
mut self: Pin<&mut Self>,
cx: &mut task::Context<'_>,
buf: &[u8],
) -> Poll<io::Result<usize>> {
Pin::new(&mut self.inner).poll_write(cx, buf)
}
#[inline]
fn poll_write_buf<B: Buf>(
mut self: Pin<&mut Self>,
cx: &mut task::Context<'_>,
buf: &mut B,
) -> Poll<io::Result<usize>> {
Pin::new(&mut self.inner).poll_write_buf(cx, buf)
}
#[inline]
fn poll_flush(self: Pin<&mut Self>, _cx: &mut task::Context<'_>) -> Poll<io::Result<()>> {
Poll::Ready(Ok(()))
}
#[inline]
fn poll_shutdown(
mut self: Pin<&mut Self>,
cx: &mut task::Context<'_>,
) -> Poll<io::Result<()>> {
Pin::new(&mut self.inner).poll_shutdown(cx)
}
}
#[cfg(unix)]
impl AsRawFd for AddrStream {
fn as_raw_fd(&self) -> RawFd {
self.inner.as_raw_fd()
}
}
}