diff options
Diffstat (limited to 'vendor/tokio/src/net/unix/split.rs')
| -rw-r--r-- | vendor/tokio/src/net/unix/split.rs | 233 |
1 files changed, 232 insertions, 1 deletions
diff --git a/vendor/tokio/src/net/unix/split.rs b/vendor/tokio/src/net/unix/split.rs index 97214f7a7..6fc7067a7 100644 --- a/vendor/tokio/src/net/unix/split.rs +++ b/vendor/tokio/src/net/unix/split.rs @@ -8,14 +8,19 @@ //! split has no associated overhead and enforces all invariants at the type //! level. -use crate::io::{AsyncRead, AsyncWrite, ReadBuf}; +use crate::io::{AsyncRead, AsyncWrite, Interest, ReadBuf, Ready}; use crate::net::UnixStream; +use crate::net::unix::SocketAddr; use std::io; use std::net::Shutdown; use std::pin::Pin; use std::task::{Context, Poll}; +cfg_io_util! { + use bytes::BufMut; +} + /// Borrowed read half of a [`UnixStream`], created by [`split`]. /// /// Reading from a `ReadHalf` is usually done using the convenience methods found on the @@ -47,6 +52,232 @@ pub(crate) fn split(stream: &mut UnixStream) -> (ReadHalf<'_>, WriteHalf<'_>) { (ReadHalf(stream), WriteHalf(stream)) } +impl ReadHalf<'_> { + /// Wait for any of the requested ready states. + /// + /// This function is usually paired with [`try_read()`]. It can be used instead + /// of [`readable()`] to check the returned ready set for [`Ready::READABLE`] + /// and [`Ready::READ_CLOSED`] events. + /// + /// The function may complete without the socket being ready. This is a + /// false-positive and attempting an operation will return with + /// `io::ErrorKind::WouldBlock`. The function can also return with an empty + /// [`Ready`] set, so you should always check the returned value and possibly + /// wait again if the requested states are not set. + /// + /// This function is equivalent to [`UnixStream::ready`]. + /// + /// [`try_read()`]: Self::try_read + /// [`readable()`]: Self::readable + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn ready(&self, interest: Interest) -> io::Result<Ready> { + self.0.ready(interest).await + } + + /// Waits for the socket to become readable. + /// + /// This function is equivalent to `ready(Interest::READABLE)` and is usually + /// paired with `try_read()`. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn readable(&self) -> io::Result<()> { + self.0.readable().await + } + + /// Tries to read data from the stream into the provided buffer, returning how + /// many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. If `n` is `0`, then it can indicate one of two scenarios: + /// + /// 1. The stream's read half is closed and will no longer yield data. + /// 2. The specified buffer was 0 bytes in length. + /// + /// If the stream is not ready to read data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read(&self, buf: &mut [u8]) -> io::Result<usize> { + self.0.try_read(buf) + } + + cfg_io_util! { + /// Tries to read data from the stream into the provided buffer, advancing the + /// buffer's internal cursor, returning how many bytes were read. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_buf()` is non-blocking, the buffer does not have to be stored by + /// the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + pub fn try_read_buf<B: BufMut>(&self, buf: &mut B) -> io::Result<usize> { + self.0.try_read_buf(buf) + } + } + + /// Tries to read data from the stream into the provided buffers, returning + /// how many bytes were read. + /// + /// Data is copied to fill each buffer in order, with the final buffer + /// written to possibly being only partially filled. This method behaves + /// equivalently to a single call to [`try_read()`] with concatenated + /// buffers. + /// + /// Receives any pending data from the socket but does not wait for new data + /// to arrive. On success, returns the number of bytes read. Because + /// `try_read_vectored()` is non-blocking, the buffer does not have to be + /// stored by the async task and can exist entirely on the stack. + /// + /// Usually, [`readable()`] or [`ready()`] is used with this function. + /// + /// [`try_read()`]: Self::try_read() + /// [`readable()`]: Self::readable() + /// [`ready()`]: Self::ready() + /// + /// # Return + /// + /// If data is successfully read, `Ok(n)` is returned, where `n` is the + /// number of bytes read. `Ok(0)` indicates the stream's read half is closed + /// and will no longer yield data. If the stream is not ready to read data + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_read_vectored(&self, bufs: &mut [io::IoSliceMut<'_>]) -> io::Result<usize> { + self.0.try_read_vectored(bufs) + } + + /// Returns the socket address of the remote half of this connection. + pub fn peer_addr(&self) -> io::Result<SocketAddr> { + self.0.peer_addr() + } + + /// Returns the socket address of the local half of this connection. + pub fn local_addr(&self) -> io::Result<SocketAddr> { + self.0.local_addr() + } +} + +impl WriteHalf<'_> { + /// Waits for any of the requested ready states. + /// + /// This function is usually paired with [`try_write()`]. It can be used instead + /// of [`writable()`] to check the returned ready set for [`Ready::WRITABLE`] + /// and [`Ready::WRITE_CLOSED`] events. + /// + /// The function may complete without the socket being ready. This is a + /// false-positive and attempting an operation will return with + /// `io::ErrorKind::WouldBlock`. The function can also return with an empty + /// [`Ready`] set, so you should always check the returned value and possibly + /// wait again if the requested states are not set. + /// + /// This function is equivalent to [`UnixStream::ready`]. + /// + /// [`try_write()`]: Self::try_write + /// [`writable()`]: Self::writable + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to read or write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn ready(&self, interest: Interest) -> io::Result<Ready> { + self.0.ready(interest).await + } + + /// Waits for the socket to become writable. + /// + /// This function is equivalent to `ready(Interest::WRITABLE)` and is usually + /// paired with `try_write()`. + /// + /// # Cancel safety + /// + /// This method is cancel safe. Once a readiness event occurs, the method + /// will continue to return immediately until the readiness event is + /// consumed by an attempt to write that fails with `WouldBlock` or + /// `Poll::Pending`. + pub async fn writable(&self) -> io::Result<()> { + self.0.writable().await + } + + /// Tries to write a buffer to the stream, returning how many bytes were + /// written. + /// + /// The function will attempt to write the entire contents of `buf`, but + /// only part of the buffer may be written. + /// + /// This function is usually paired with `writable()`. + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write(&self, buf: &[u8]) -> io::Result<usize> { + self.0.try_write(buf) + } + + /// Tries to write several buffers to the stream, returning how many bytes + /// were written. + /// + /// Data is written from each buffer in order, with the final buffer read + /// from possible being only partially consumed. This method behaves + /// equivalently to a single call to [`try_write()`] with concatenated + /// buffers. + /// + /// This function is usually paired with `writable()`. + /// + /// [`try_write()`]: Self::try_write() + /// + /// # Return + /// + /// If data is successfully written, `Ok(n)` is returned, where `n` is the + /// number of bytes written. If the stream is not ready to write data, + /// `Err(io::ErrorKind::WouldBlock)` is returned. + pub fn try_write_vectored(&self, buf: &[io::IoSlice<'_>]) -> io::Result<usize> { + self.0.try_write_vectored(buf) + } + + /// Returns the socket address of the remote half of this connection. + pub fn peer_addr(&self) -> io::Result<SocketAddr> { + self.0.peer_addr() + } + + /// Returns the socket address of the local half of this connection. + pub fn local_addr(&self) -> io::Result<SocketAddr> { + self.0.local_addr() + } +} + impl AsyncRead for ReadHalf<'_> { fn poll_read( self: Pin<&mut Self>, |