1 files changed, 411 insertions, 0 deletions
diff --git a/third_party/rust/tokio/tests/uds_stream.rs b/third_party/rust/tokio/tests/uds_stream.rs
new file mode 100644
index 0000000000..5f1b4cffbc
--- /dev/null
+++ b/third_party/rust/tokio/tests/uds_stream.rs
@@ -0,0 +1,411 @@
+#![cfg(feature = "full")]
+#![warn(rust_2018_idioms)]
+#![cfg(unix)]
+
+use std::io;
+use std::task::Poll;
+
+use tokio::io::{AsyncReadExt, AsyncWriteExt, Interest};
+use tokio::net::{UnixListener, UnixStream};
+use tokio_test::{assert_ok, assert_pending, assert_ready_ok, task};
+
+use futures::future::{poll_fn, try_join};
+
+#[tokio::test]
+async fn accept_read_write() -> std::io::Result<()> {
+    let dir = tempfile::Builder::new()
+        .prefix("tokio-uds-tests")
+        .tempdir()
+        .unwrap();
+    let sock_path = dir.path().join("connect.sock");
+
+    let listener = UnixListener::bind(&sock_path)?;
+
+    let accept = listener.accept();
+    let connect = UnixStream::connect(&sock_path);
+    let ((mut server, _), mut client) = try_join(accept, connect).await?;
+
+    // Write to the client. TODO: Switch to write_all.
+    let write_len = client.write(b"hello").await?;
+    assert_eq!(write_len, 5);
+    drop(client);
+    // Read from the server. TODO: Switch to read_to_end.
+    let mut buf = [0u8; 5];
+    server.read_exact(&mut buf).await?;
+    assert_eq!(&buf, b"hello");
+    let len = server.read(&mut buf).await?;
+    assert_eq!(len, 0);
+    Ok(())
+}
+
+#[tokio::test]
+async fn shutdown() -> std::io::Result<()> {
+    let dir = tempfile::Builder::new()
+        .prefix("tokio-uds-tests")
+        .tempdir()
+        .unwrap();
+    let sock_path = dir.path().join("connect.sock");
+
+    let listener = UnixListener::bind(&sock_path)?;
+
+    let accept = listener.accept();
+    let connect = UnixStream::connect(&sock_path);
+    let ((mut server, _), mut client) = try_join(accept, connect).await?;
+
+    // Shut down the client
+    AsyncWriteExt::shutdown(&mut client).await?;
+    // Read from the server should return 0 to indicate the channel has been closed.
+    let mut buf = [0u8; 1];
+    let n = server.read(&mut buf).await?;
+    assert_eq!(n, 0);
+    Ok(())
+}
+
+#[tokio::test]
+async fn try_read_write() -> std::io::Result<()> {
+    let msg = b"hello world";
+
+    let dir = tempfile::tempdir()?;
+    let bind_path = dir.path().join("bind.sock");
+
+    // Create listener
+    let listener = UnixListener::bind(&bind_path)?;
+
+    // Create socket pair
+    let client = UnixStream::connect(&bind_path).await?;
+
+    let (server, _) = listener.accept().await?;
+    let mut written = msg.to_vec();
+
+    // Track the server receiving data
+    let mut readable = task::spawn(server.readable());
+    assert_pending!(readable.poll());
+
+    // Write data.
+    client.writable().await?;
+    assert_eq!(msg.len(), client.try_write(msg)?);
+
+    // 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(msg) {
+            Ok(n) => written.extend(&msg[..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?;
+
+            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 msg_bufs: Vec<_> = msg.chunks(3).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(&msg_bufs) {
+            Ok(n) => written.extend(&msg[..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?;
+
+            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?;
+
+        if ready.is_read_closed() {
+            break;
+        } else {
+            tokio::task::yield_now().await;
+        }
+    }
+
+    Ok(())
+}
+
+async fn create_pair() -> (UnixStream, UnixStream) {
+    let dir = assert_ok!(tempfile::tempdir());
+    let bind_path = dir.path().join("bind.sock");
+
+    let listener = assert_ok!(UnixListener::bind(&bind_path));
+
+    let accept = listener.accept();
+    let connect = UnixStream::connect(&bind_path);
+    let ((server, _), client) = assert_ok!(try_join(accept, connect).await);
+
+    (client, server)
+}
+
+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);
+}
+
+fn read_until_pending(stream: &mut UnixStream) {
+    let mut buf = vec![0u8; 1024 * 1024];
+    loop {
+        match stream.try_read(&mut buf) {
+            Ok(_) => (),
+            Err(err) => {
+                assert_eq!(err.kind(), io::ErrorKind::WouldBlock);
+                break;
+            }
+        }
+    }
+}
+
+fn write_until_pending(stream: &mut UnixStream) {
+    let buf = vec![0u8; 1024 * 1024];
+    loop {
+        match stream.try_write(&buf) {
+            Ok(_) => (),
+            Err(err) => {
+                assert_eq!(err.kind(), io::ErrorKind::WouldBlock);
+                break;
+            }
+        }
+    }
+}
+
+#[tokio::test]
+async fn try_read_buf() -> std::io::Result<()> {
+    let msg = b"hello world";
+
+    let dir = tempfile::tempdir()?;
+    let bind_path = dir.path().join("bind.sock");
+
+    // Create listener
+    let listener = UnixListener::bind(&bind_path)?;
+
+    // Create socket pair
+    let client = UnixStream::connect(&bind_path).await?;
+
+    let (server, _) = listener.accept().await?;
+    let mut written = msg.to_vec();
+
+    // Track the server receiving data
+    let mut readable = task::spawn(server.readable());
+    assert_pending!(readable.poll());
+
+    // Write data.
+    client.writable().await?;
+    assert_eq!(msg.len(), client.try_write(msg)?);
+
+    // 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(msg) {
+            Ok(n) => written.extend(&msg[..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?;
+
+            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?;
+
+        if ready.is_read_closed() {
+            break;
+        } else {
+            tokio::task::yield_now().await;
+        }
+    }
+
+    Ok(())
+}
+
+// https://github.com/tokio-rs/tokio/issues/3879
+#[tokio::test]
+#[cfg(not(target_os = "macos"))]
+async fn epollhup() -> io::Result<()> {
+    let dir = tempfile::Builder::new()
+        .prefix("tokio-uds-tests")
+        .tempdir()
+        .unwrap();
+    let sock_path = dir.path().join("connect.sock");
+
+    let listener = UnixListener::bind(&sock_path)?;
+    let connect = UnixStream::connect(&sock_path);
+    tokio::pin!(connect);
+
+    // Poll `connect` once.
+    poll_fn(|cx| {
+        use std::future::Future;
+
+        assert_pending!(connect.as_mut().poll(cx));
+        Poll::Ready(())
+    })
+    .await;
+
+    drop(listener);
+
+    let err = connect.await.unwrap_err();
+    assert_eq!(err.kind(), io::ErrorKind::ConnectionReset);
+    Ok(())
+}