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#![warn(rust_2018_idioms)]
#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind
use tokio::io::{AsyncReadExt, AsyncWriteExt, Interest};
use tokio::net::{TcpListener, TcpStream};
use tokio::try_join;
use tokio_test::task;
use tokio_test::{assert_ok, assert_pending, assert_ready_ok};
use std::io;
use std::task::Poll;
use std::time::Duration;
use futures::future::poll_fn;
#[tokio::test]
async fn set_linger() {
let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
let stream = TcpStream::connect(listener.local_addr().unwrap())
.await
.unwrap();
assert_ok!(stream.set_linger(Some(Duration::from_secs(1))));
assert_eq!(stream.linger().unwrap().unwrap().as_secs(), 1);
assert_ok!(stream.set_linger(None));
assert!(stream.linger().unwrap().is_none());
}
#[tokio::test]
async fn try_read_write() {
const DATA: &[u8] = b"this is some data to write to the socket";
// Create listener
let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
// Create socket pair
let client = TcpStream::connect(listener.local_addr().unwrap())
.await
.unwrap();
let (server, _) = listener.accept().await.unwrap();
let mut written = DATA.to_vec();
// Track the server receiving data
let mut readable = task::spawn(server.readable());
assert_pending!(readable.poll());
// Write data.
client.writable().await.unwrap();
assert_eq!(DATA.len(), client.try_write(DATA).unwrap());
// The task should be notified
while !readable.is_woken() {
tokio::task::yield_now().await;
}
// Fill the write buffer using non-vectored I/O
loop {
// Still ready
let mut writable = task::spawn(client.writable());
assert_ready_ok!(writable.poll());
match client.try_write(DATA) {
Ok(n) => written.extend(&DATA[..n]),
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
break;
}
Err(e) => panic!("error = {:?}", e),
}
}
{
// Write buffer full
let mut writable = task::spawn(client.writable());
assert_pending!(writable.poll());
// Drain the socket from the server end using non-vectored I/O
let mut read = vec![0; written.len()];
let mut i = 0;
while i < read.len() {
server.readable().await.unwrap();
match server.try_read(&mut read[i..]) {
Ok(n) => i += n,
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => continue,
Err(e) => panic!("error = {:?}", e),
}
}
assert_eq!(read, written);
}
written.clear();
client.writable().await.unwrap();
// Fill the write buffer using vectored I/O
let data_bufs: Vec<_> = DATA.chunks(10).map(io::IoSlice::new).collect();
loop {
// Still ready
let mut writable = task::spawn(client.writable());
assert_ready_ok!(writable.poll());
match client.try_write_vectored(&data_bufs) {
Ok(n) => written.extend(&DATA[..n]),
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
break;
}
Err(e) => panic!("error = {:?}", e),
}
}
{
// Write buffer full
let mut writable = task::spawn(client.writable());
assert_pending!(writable.poll());
// Drain the socket from the server end using vectored I/O
let mut read = vec![0; written.len()];
let mut i = 0;
while i < read.len() {
server.readable().await.unwrap();
let mut bufs: Vec<_> = read[i..]
.chunks_mut(0x10000)
.map(io::IoSliceMut::new)
.collect();
match server.try_read_vectored(&mut bufs) {
Ok(n) => i += n,
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => continue,
Err(e) => panic!("error = {:?}", e),
}
}
assert_eq!(read, written);
}
// Now, we listen for shutdown
drop(client);
loop {
let ready = server.ready(Interest::READABLE).await.unwrap();
if ready.is_read_closed() {
return;
} else {
tokio::task::yield_now().await;
}
}
}
#[test]
fn buffer_not_included_in_future() {
use std::mem;
const N: usize = 4096;
let fut = async {
let stream = TcpStream::connect("127.0.0.1:8080").await.unwrap();
loop {
stream.readable().await.unwrap();
let mut buf = [0; N];
let n = stream.try_read(&mut buf[..]).unwrap();
if n == 0 {
break;
}
}
};
let n = mem::size_of_val(&fut);
assert!(n < 1000);
}
macro_rules! assert_readable_by_polling {
($stream:expr) => {
assert_ok!(poll_fn(|cx| $stream.poll_read_ready(cx)).await);
};
}
macro_rules! assert_not_readable_by_polling {
($stream:expr) => {
poll_fn(|cx| {
assert_pending!($stream.poll_read_ready(cx));
Poll::Ready(())
})
.await;
};
}
macro_rules! assert_writable_by_polling {
($stream:expr) => {
assert_ok!(poll_fn(|cx| $stream.poll_write_ready(cx)).await);
};
}
macro_rules! assert_not_writable_by_polling {
($stream:expr) => {
poll_fn(|cx| {
assert_pending!($stream.poll_write_ready(cx));
Poll::Ready(())
})
.await;
};
}
#[tokio::test]
async fn poll_read_ready() {
let (mut client, mut server) = create_pair().await;
// Initial state - not readable.
assert_not_readable_by_polling!(server);
// There is data in the buffer - readable.
assert_ok!(client.write_all(b"ping").await);
assert_readable_by_polling!(server);
// Readable until calls to `poll_read` return `Poll::Pending`.
let mut buf = [0u8; 4];
assert_ok!(server.read_exact(&mut buf).await);
assert_readable_by_polling!(server);
read_until_pending(&mut server);
assert_not_readable_by_polling!(server);
// Detect the client disconnect.
drop(client);
assert_readable_by_polling!(server);
}
#[tokio::test]
async fn poll_write_ready() {
let (mut client, server) = create_pair().await;
// Initial state - writable.
assert_writable_by_polling!(client);
// No space to write - not writable.
write_until_pending(&mut client);
assert_not_writable_by_polling!(client);
// Detect the server disconnect.
drop(server);
assert_writable_by_polling!(client);
}
async fn create_pair() -> (TcpStream, TcpStream) {
let listener = assert_ok!(TcpListener::bind("127.0.0.1:0").await);
let addr = assert_ok!(listener.local_addr());
let (client, (server, _)) = assert_ok!(try_join!(TcpStream::connect(&addr), listener.accept()));
(client, server)
}
fn read_until_pending(stream: &mut TcpStream) -> usize {
let mut buf = vec![0u8; 1024 * 1024];
let mut total = 0;
loop {
match stream.try_read(&mut buf) {
Ok(n) => total += n,
Err(err) => {
assert_eq!(err.kind(), io::ErrorKind::WouldBlock);
break;
}
}
}
total
}
fn write_until_pending(stream: &mut TcpStream) -> usize {
let buf = vec![0u8; 1024 * 1024];
let mut total = 0;
loop {
match stream.try_write(&buf) {
Ok(n) => total += n,
Err(err) => {
assert_eq!(err.kind(), io::ErrorKind::WouldBlock);
break;
}
}
}
total
}
#[tokio::test]
async fn try_read_buf() {
const DATA: &[u8] = b"this is some data to write to the socket";
// Create listener
let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
// Create socket pair
let client = TcpStream::connect(listener.local_addr().unwrap())
.await
.unwrap();
let (server, _) = listener.accept().await.unwrap();
let mut written = DATA.to_vec();
// Track the server receiving data
let mut readable = task::spawn(server.readable());
assert_pending!(readable.poll());
// Write data.
client.writable().await.unwrap();
assert_eq!(DATA.len(), client.try_write(DATA).unwrap());
// The task should be notified
while !readable.is_woken() {
tokio::task::yield_now().await;
}
// Fill the write buffer
loop {
// Still ready
let mut writable = task::spawn(client.writable());
assert_ready_ok!(writable.poll());
match client.try_write(DATA) {
Ok(n) => written.extend(&DATA[..n]),
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => {
break;
}
Err(e) => panic!("error = {:?}", e),
}
}
{
// Write buffer full
let mut writable = task::spawn(client.writable());
assert_pending!(writable.poll());
// Drain the socket from the server end
let mut read = Vec::with_capacity(written.len());
let mut i = 0;
while i < read.capacity() {
server.readable().await.unwrap();
match server.try_read_buf(&mut read) {
Ok(n) => i += n,
Err(ref e) if e.kind() == io::ErrorKind::WouldBlock => continue,
Err(e) => panic!("error = {:?}", e),
}
}
assert_eq!(read, written);
}
// Now, we listen for shutdown
drop(client);
loop {
let ready = server.ready(Interest::READABLE).await.unwrap();
if ready.is_read_closed() {
return;
} else {
tokio::task::yield_now().await;
}
}
}
// read_closed is a best effort event, so test only for no false positives.
#[tokio::test]
async fn read_closed() {
let (client, mut server) = create_pair().await;
let mut ready_fut = task::spawn(client.ready(Interest::READABLE));
assert_pending!(ready_fut.poll());
assert_ok!(server.write_all(b"ping").await);
let ready_event = assert_ok!(ready_fut.await);
assert!(!ready_event.is_read_closed());
}
// write_closed is a best effort event, so test only for no false positives.
#[tokio::test]
async fn write_closed() {
let (mut client, mut server) = create_pair().await;
// Fill the write buffer.
let write_size = write_until_pending(&mut client);
let mut ready_fut = task::spawn(client.ready(Interest::WRITABLE));
assert_pending!(ready_fut.poll());
// Drain the socket to make client writable.
let mut read_size = 0;
while read_size < write_size {
server.readable().await.unwrap();
read_size += read_until_pending(&mut server);
}
let ready_event = assert_ok!(ready_fut.await);
assert!(!ready_event.is_write_closed());
}