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#![cfg(feature = "io-util")]
#![cfg(not(target_os = "wasi"))] // Wasi doesn't support threads
use std::error::Error;
use std::io::{Cursor, Read, Result as IoResult, Write};
use tokio::io::{AsyncRead, AsyncReadExt};
use tokio_util::io::SyncIoBridge;
async fn test_reader_len(
r: impl AsyncRead + Unpin + Send + 'static,
expected_len: usize,
) -> IoResult<()> {
let mut r = SyncIoBridge::new(r);
let res = tokio::task::spawn_blocking(move || {
let mut buf = Vec::new();
r.read_to_end(&mut buf)?;
Ok::<_, std::io::Error>(buf)
})
.await?;
assert_eq!(res?.len(), expected_len);
Ok(())
}
#[tokio::test]
async fn test_async_read_to_sync() -> Result<(), Box<dyn Error>> {
test_reader_len(tokio::io::empty(), 0).await?;
let buf = b"hello world";
test_reader_len(Cursor::new(buf), buf.len()).await?;
Ok(())
}
#[tokio::test]
async fn test_async_write_to_sync() -> Result<(), Box<dyn Error>> {
let mut dest = Vec::new();
let src = b"hello world";
let dest = tokio::task::spawn_blocking(move || -> Result<_, String> {
let mut w = SyncIoBridge::new(Cursor::new(&mut dest));
std::io::copy(&mut Cursor::new(src), &mut w).map_err(|e| e.to_string())?;
Ok(dest)
})
.await??;
assert_eq!(dest.as_slice(), src);
Ok(())
}
#[tokio::test]
async fn test_into_inner() -> Result<(), Box<dyn Error>> {
let mut buf = Vec::new();
SyncIoBridge::new(tokio::io::empty())
.into_inner()
.read_to_end(&mut buf)
.await
.unwrap();
assert_eq!(buf.len(), 0);
Ok(())
}
#[tokio::test]
async fn test_shutdown() -> Result<(), Box<dyn Error>> {
let (s1, mut s2) = tokio::io::duplex(1024);
let (_rh, wh) = tokio::io::split(s1);
tokio::task::spawn_blocking(move || -> std::io::Result<_> {
let mut wh = SyncIoBridge::new(wh);
wh.write_all(b"hello")?;
wh.shutdown()?;
assert!(wh.write_all(b" world").is_err());
Ok(())
})
.await??;
let mut buf = vec![];
s2.read_to_end(&mut buf).await?;
assert_eq!(buf, b"hello");
Ok(())
}
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