mirror of
https://github.com/tokio-rs/tokio.git
synced 2025-10-01 12:20:39 +00:00
28 lines
822 B
Rust
28 lines
822 B
Rust
#![warn(rust_2018_idioms)]
|
|
#![feature(async_await)]
|
|
|
|
use std::thread;
|
|
use std::{convert::TryInto, io::Write, net};
|
|
use tokio::io::AsyncReadExt;
|
|
use tokio::net::TcpStream;
|
|
use tokio_test::assert_ok;
|
|
|
|
#[tokio::test]
|
|
async fn peek() {
|
|
let listener = net::TcpListener::bind("127.0.0.1:0").unwrap();
|
|
let addr = listener.local_addr().unwrap();
|
|
let t = thread::spawn(move || assert_ok!(listener.accept()).0);
|
|
|
|
let left = net::TcpStream::connect(&addr).unwrap();
|
|
let mut right = t.join().unwrap();
|
|
right.write(&[1, 2, 3, 4]).unwrap();
|
|
|
|
let mut left: TcpStream = left.try_into().unwrap();
|
|
let mut buf = [0u8; 16];
|
|
let n = assert_ok!(left.peek(&mut buf).await);
|
|
assert_eq!([1, 2, 3, 4], buf[..n]);
|
|
|
|
let n = assert_ok!(left.read(&mut buf).await);
|
|
assert_eq!([1, 2, 3, 4], buf[..n]);
|
|
}
|