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| </pre><pre class="rust"><code><span class="doccomment">//! `UnixStream` split support. |
| //! |
| //! A `UnixStream` can be split into a read half and a write half with |
| //! `UnixStream::split`. The read half implements `AsyncRead` while the write |
| //! half implements `AsyncWrite`. |
| //! |
| //! Compared to the generic split of `AsyncRead + AsyncWrite`, this specialized |
| //! split has no associated overhead and enforces all invariants at the type |
| //! level. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::io::{AsyncRead, AsyncWrite, Interest, ReadBuf, Ready}; |
| <span class="kw">use </span><span class="kw">crate</span>::net::UnixStream; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::net::unix::SocketAddr; |
| <span class="kw">use </span>std::io; |
| <span class="kw">use </span>std::net::Shutdown; |
| <span class="kw">use </span>std::pin::Pin; |
| <span class="kw">use </span>std::task::{Context, Poll}; |
| |
| <span class="macro">cfg_io_util! </span>{ |
| <span class="kw">use </span>bytes::BufMut; |
| } |
| |
| <span class="doccomment">/// Borrowed read half of a [`UnixStream`], created by [`split`]. |
| /// |
| /// Reading from a `ReadHalf` is usually done using the convenience methods found on the |
| /// [`AsyncReadExt`] trait. |
| /// |
| /// [`UnixStream`]: UnixStream |
| /// [`split`]: UnixStream::split() |
| /// [`AsyncReadExt`]: trait@crate::io::AsyncReadExt |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>ReadHalf<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span>UnixStream); |
| |
| <span class="doccomment">/// Borrowed write half of a [`UnixStream`], created by [`split`]. |
| /// |
| /// Note that in the [`AsyncWrite`] implementation of this type, [`poll_shutdown`] will |
| /// shut down the UnixStream stream in the write direction. |
| /// |
| /// Writing to an `WriteHalf` is usually done using the convenience methods found |
| /// on the [`AsyncWriteExt`] trait. |
| /// |
| /// [`UnixStream`]: UnixStream |
| /// [`split`]: UnixStream::split() |
| /// [`AsyncWrite`]: trait@crate::io::AsyncWrite |
| /// [`poll_shutdown`]: fn@crate::io::AsyncWrite::poll_shutdown |
| /// [`AsyncWriteExt`]: trait@crate::io::AsyncWriteExt |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>WriteHalf<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span>UnixStream); |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>split(stream: <span class="kw-2">&mut </span>UnixStream) -> (ReadHalf<<span class="lifetime">'_</span>>, WriteHalf<<span class="lifetime">'_</span>>) { |
| (ReadHalf(stream), WriteHalf(stream)) |
| } |
| |
| <span class="kw">impl </span>ReadHalf<<span class="lifetime">'_</span>> { |
| <span class="doccomment">/// Wait for any of the requested ready states. |
| /// |
| /// This function is usually paired with `try_read()` or `try_write()`. It |
| /// can be used to concurrently read / write to the same socket on a single |
| /// task without splitting the socket. |
| /// |
| /// # 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`. |
| </span><span class="kw">pub async fn </span>ready(<span class="kw-2">&</span><span class="self">self</span>, interest: Interest) -> io::Result<Ready> { |
| <span class="self">self</span>.<span class="number">0</span>.ready(interest).<span class="kw">await |
| </span>} |
| |
| <span class="doccomment">/// 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`. |
| </span><span class="kw">pub async fn </span>readable(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<()> { |
| <span class="self">self</span>.<span class="number">0</span>.readable().<span class="kw">await |
| </span>} |
| |
| <span class="doccomment">/// 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. |
| </span><span class="kw">pub fn </span>try_read(<span class="kw-2">&</span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>[u8]) -> io::Result<usize> { |
| <span class="self">self</span>.<span class="number">0</span>.try_read(buf) |
| } |
| |
| <span class="macro">cfg_io_util! </span>{ |
| <span class="doccomment">/// 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 |
| </span><span class="kw">pub fn </span>try_read_buf<B: BufMut>(<span class="kw-2">&</span><span class="self">self</span>, buf: <span class="kw-2">&mut </span>B) -> io::Result<usize> { |
| <span class="self">self</span>.<span class="number">0</span>.try_read_buf(buf) |
| } |
| } |
| |
| <span class="doccomment">/// 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. |
| </span><span class="kw">pub fn </span>try_read_vectored(<span class="kw-2">&</span><span class="self">self</span>, bufs: <span class="kw-2">&mut </span>[io::IoSliceMut<<span class="lifetime">'_</span>>]) -> io::Result<usize> { |
| <span class="self">self</span>.<span class="number">0</span>.try_read_vectored(bufs) |
| } |
| |
| <span class="doccomment">/// Returns the socket address of the remote half of this connection. |
| </span><span class="kw">pub fn </span>peer_addr(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<SocketAddr> { |
| <span class="self">self</span>.<span class="number">0</span>.peer_addr() |
| } |
| |
| <span class="doccomment">/// Returns the socket address of the local half of this connection. |
| </span><span class="kw">pub fn </span>local_addr(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<SocketAddr> { |
| <span class="self">self</span>.<span class="number">0</span>.local_addr() |
| } |
| } |
| |
| <span class="kw">impl </span>WriteHalf<<span class="lifetime">'_</span>> { |
| <span class="doccomment">/// Waits for any of the requested ready states. |
| /// |
| /// This function is usually paired with `try_read()` or `try_write()`. It |
| /// can be used to concurrently read / write to the same socket on a single |
| /// task without splitting the socket. |
| /// |
| /// 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. |
| /// |
| /// # 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`. |
| </span><span class="kw">pub async fn </span>ready(<span class="kw-2">&</span><span class="self">self</span>, interest: Interest) -> io::Result<Ready> { |
| <span class="self">self</span>.<span class="number">0</span>.ready(interest).<span class="kw">await |
| </span>} |
| |
| <span class="doccomment">/// 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`. |
| </span><span class="kw">pub async fn </span>writable(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<()> { |
| <span class="self">self</span>.<span class="number">0</span>.writable().<span class="kw">await |
| </span>} |
| |
| <span class="doccomment">/// 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. |
| </span><span class="kw">pub fn </span>try_write(<span class="kw-2">&</span><span class="self">self</span>, buf: <span class="kw-2">&</span>[u8]) -> io::Result<usize> { |
| <span class="self">self</span>.<span class="number">0</span>.try_write(buf) |
| } |
| |
| <span class="doccomment">/// 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. |
| </span><span class="kw">pub fn </span>try_write_vectored(<span class="kw-2">&</span><span class="self">self</span>, buf: <span class="kw-2">&</span>[io::IoSlice<<span class="lifetime">'_</span>>]) -> io::Result<usize> { |
| <span class="self">self</span>.<span class="number">0</span>.try_write_vectored(buf) |
| } |
| |
| <span class="doccomment">/// Returns the socket address of the remote half of this connection. |
| </span><span class="kw">pub fn </span>peer_addr(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<SocketAddr> { |
| <span class="self">self</span>.<span class="number">0</span>.peer_addr() |
| } |
| |
| <span class="doccomment">/// Returns the socket address of the local half of this connection. |
| </span><span class="kw">pub fn </span>local_addr(<span class="kw-2">&</span><span class="self">self</span>) -> io::Result<SocketAddr> { |
| <span class="self">self</span>.<span class="number">0</span>.local_addr() |
| } |
| } |
| |
| <span class="kw">impl </span>AsyncRead <span class="kw">for </span>ReadHalf<<span class="lifetime">'_</span>> { |
| <span class="kw">fn </span>poll_read( |
| <span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&mut </span>ReadBuf<<span class="lifetime">'_</span>>, |
| ) -> Poll<io::Result<()>> { |
| <span class="self">self</span>.<span class="number">0</span>.poll_read_priv(cx, buf) |
| } |
| } |
| |
| <span class="kw">impl </span>AsyncWrite <span class="kw">for </span>WriteHalf<<span class="lifetime">'_</span>> { |
| <span class="kw">fn </span>poll_write( |
| <span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&</span>[u8], |
| ) -> Poll<io::Result<usize>> { |
| <span class="self">self</span>.<span class="number">0</span>.poll_write_priv(cx, buf) |
| } |
| |
| <span class="kw">fn </span>poll_write_vectored( |
| <span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>, |
| bufs: <span class="kw-2">&</span>[io::IoSlice<<span class="lifetime">'_</span>>], |
| ) -> Poll<io::Result<usize>> { |
| <span class="self">self</span>.<span class="number">0</span>.poll_write_vectored_priv(cx, bufs) |
| } |
| |
| <span class="kw">fn </span>is_write_vectored(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.<span class="number">0</span>.is_write_vectored() |
| } |
| |
| <span class="kw">fn </span>poll_flush(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, <span class="kw">_</span>: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<io::Result<()>> { |
| Poll::Ready(<span class="prelude-val">Ok</span>(())) |
| } |
| |
| <span class="kw">fn </span>poll_shutdown(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, <span class="kw">_</span>: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<io::Result<()>> { |
| <span class="self">self</span>.<span class="number">0</span>.shutdown_std(Shutdown::Write).into() |
| } |
| } |
| |
| <span class="kw">impl </span>AsRef<UnixStream> <span class="kw">for </span>ReadHalf<<span class="lifetime">'_</span>> { |
| <span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>UnixStream { |
| <span class="self">self</span>.<span class="number">0 |
| </span>} |
| } |
| |
| <span class="kw">impl </span>AsRef<UnixStream> <span class="kw">for </span>WriteHalf<<span class="lifetime">'_</span>> { |
| <span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>UnixStream { |
| <span class="self">self</span>.<span class="number">0 |
| </span>} |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="tokio" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
