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#![warn(rust_2018_idioms)]
#![cfg(feature = "full")]
use tokio::io::Interest;
use tokio::net::{TcpListener, TcpStream};
use tokio_test::task;
use tokio_test::{assert_pending, assert_ready_ok};
use std::io;
#[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
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![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);
}
// 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);
}
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