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use std::fmt;
use std::io;
use std::net::{SocketAddr, TcpListener as StdTcpListener};
use std::time::{Duration, Instant};
use futures::{Async, Future, Poll, Stream};
use tokio_reactor::Handle;
use tokio_tcp::TcpListener;
use tokio_timer::Delay;
pub use self::addr_stream::AddrStream;
#[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, handle: Option<&Handle>) -> ::Result<Self> {
let std_listener = StdTcpListener::bind(addr)
.map_err(::Error::new_listen)?;
if let Some(handle) = handle {
AddrIncoming::from_std(std_listener, handle)
} else {
let handle = Handle::default();
AddrIncoming::from_std(std_listener, &handle)
}
}
pub(super) fn from_std(std_listener: StdTcpListener, handle: &Handle) -> ::Result<Self> {
let listener = TcpListener::from_std(std_listener, &handle)
.map_err(::Error::new_listen)?;
let addr = listener.local_addr().map_err(::Error::new_listen)?;
Ok(AddrIncoming {
listener,
addr: addr,
sleep_on_errors: true,
tcp_keepalive_timeout: None,
tcp_nodelay: false,
timeout: None,
})
}
pub fn bind(addr: &SocketAddr) -> ::Result<Self> {
AddrIncoming::new(addr, None)
}
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;
}
}
impl Stream for AddrIncoming {
type Item = AddrStream;
type Error = ::std::io::Error;
fn poll(&mut self) -> Poll<Option<Self::Item>, Self::Error> {
if let Some(ref mut to) = self.timeout {
match to.poll() {
Ok(Async::Ready(())) => {}
Ok(Async::NotReady) => return Ok(Async::NotReady),
Err(err) => {
error!("sleep timer error: {}", err);
}
}
}
self.timeout = None;
loop {
match self.listener.poll_accept() {
Ok(Async::Ready((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 Ok(Async::Ready(Some(AddrStream::new(socket, addr))));
},
Ok(Async::NotReady) => return Ok(Async::NotReady),
Err(e) => {
if is_connection_error(&e) {
debug!("accepted connection already errored: {}", e);
continue;
}
if self.sleep_on_errors {
let delay = Instant::now() + Duration::from_secs(1);
let mut timeout = Delay::new(delay);
match timeout.poll() {
Ok(Async::Ready(())) => {
error!("accept error: {}", e);
continue
},
Ok(Async::NotReady) => {
error!("accept error: {}", e);
self.timeout = Some(timeout);
return Ok(Async::NotReady);
},
Err(timer_err) => {
error!("couldn't sleep on error, timer error: {}", timer_err);
return Err(e);
}
}
} else {
return Err(e);
}
},
}
}
}
}
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 std::io::{self, Read, Write};
use std::net::SocketAddr;
use bytes::{Buf, BufMut};
use futures::Poll;
use tokio_tcp::TcpStream;
use tokio_io::{AsyncRead, AsyncWrite};
#[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
}
}
impl Read for AddrStream {
#[inline]
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
self.inner.read(buf)
}
}
impl Write for AddrStream {
#[inline]
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
self.inner.write(buf)
}
#[inline]
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
impl AsyncRead for AddrStream {
#[inline]
unsafe fn prepare_uninitialized_buffer(&self, buf: &mut [u8]) -> bool {
self.inner.prepare_uninitialized_buffer(buf)
}
#[inline]
fn read_buf<B: BufMut>(&mut self, buf: &mut B) -> Poll<usize, io::Error> {
self.inner.read_buf(buf)
}
}
impl AsyncWrite for AddrStream {
#[inline]
fn shutdown(&mut self) -> Poll<(), io::Error> {
AsyncWrite::shutdown(&mut self.inner)
}
#[inline]
fn write_buf<B: Buf>(&mut self, buf: &mut B) -> Poll<usize, io::Error> {
self.inner.write_buf(buf)
}
}
}