#![warn(rust_2018_idioms)] #![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support bind use std::io::Result; use std::io::{Read, Write}; use std::{net, thread}; use tokio::io::{AsyncReadExt, AsyncWriteExt}; use tokio::net::TcpStream; #[tokio::test] async fn split() -> Result<()> { const MSG: &[u8] = b"split"; let listener = net::TcpListener::bind("127.0.0.1:0")?; let addr = listener.local_addr()?; let handle = thread::spawn(move || { let (mut stream, _) = listener.accept().unwrap(); stream.write_all(MSG).unwrap(); let mut read_buf = [0u8; 32]; let read_len = stream.read(&mut read_buf).unwrap(); assert_eq!(&read_buf[..read_len], MSG); }); let mut stream = TcpStream::connect(&addr).await?; let (mut read_half, mut write_half) = stream.split(); let mut read_buf = [0u8; 32]; let peek_len1 = read_half.peek(&mut read_buf[..]).await?; let peek_len2 = read_half.peek(&mut read_buf[..]).await?; assert_eq!(peek_len1, peek_len2); let read_len = read_half.read(&mut read_buf[..]).await?; assert_eq!(peek_len1, read_len); assert_eq!(&read_buf[..read_len], MSG); assert_eq!(write_half.write(MSG).await?, MSG.len()); handle.join().unwrap(); Ok(()) }