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| </pre><pre class="rust"><code><span class="doccomment">//! In-process memory IO types. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::io::{AsyncRead, AsyncWrite, ReadBuf}; |
| <span class="kw">use </span><span class="kw">crate</span>::loom::sync::Mutex; |
| |
| <span class="kw">use </span>bytes::{Buf, BytesMut}; |
| <span class="kw">use </span>std::{ |
| pin::Pin, |
| sync::Arc, |
| task::{<span class="self">self</span>, Poll, Waker}, |
| }; |
| |
| <span class="doccomment">/// A bidirectional pipe to read and write bytes in memory. |
| /// |
| /// A pair of `DuplexStream`s are created together, and they act as a "channel" |
| /// that can be used as in-memory IO types. Writing to one of the pairs will |
| /// allow that data to be read from the other, and vice versa. |
| /// |
| /// # Closing a `DuplexStream` |
| /// |
| /// If one end of the `DuplexStream` channel is dropped, any pending reads on |
| /// the other side will continue to read data until the buffer is drained, then |
| /// they will signal EOF by returning 0 bytes. Any writes to the other side, |
| /// including pending ones (that are waiting for free space in the buffer) will |
| /// return `Err(BrokenPipe)` immediately. |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// # async fn ex() -> std::io::Result<()> { |
| /// # use tokio::io::{AsyncReadExt, AsyncWriteExt}; |
| /// let (mut client, mut server) = tokio::io::duplex(64); |
| /// |
| /// client.write_all(b"ping").await?; |
| /// |
| /// let mut buf = [0u8; 4]; |
| /// server.read_exact(&mut buf).await?; |
| /// assert_eq!(&buf, b"ping"); |
| /// |
| /// server.write_all(b"pong").await?; |
| /// |
| /// client.read_exact(&mut buf).await?; |
| /// assert_eq!(&buf, b"pong"); |
| /// # Ok(()) |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[derive(Debug)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"io-util"</span>)))] |
| </span><span class="kw">pub struct </span>DuplexStream { |
| read: Arc<Mutex<Pipe>>, |
| write: Arc<Mutex<Pipe>>, |
| } |
| |
| <span class="doccomment">/// A unidirectional IO over a piece of memory. |
| /// |
| /// Data can be written to the pipe, and reading will return that data. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">struct </span>Pipe { |
| <span class="doccomment">/// The buffer storing the bytes written, also read from. |
| /// |
| /// Using a `BytesMut` because it has efficient `Buf` and `BufMut` |
| /// functionality already. Additionally, it can try to copy data in the |
| /// same buffer if there read index has advanced far enough. |
| </span>buffer: BytesMut, |
| <span class="doccomment">/// Determines if the write side has been closed. |
| </span>is_closed: bool, |
| <span class="doccomment">/// The maximum amount of bytes that can be written before returning |
| /// `Poll::Pending`. |
| </span>max_buf_size: usize, |
| <span class="doccomment">/// If the `read` side has been polled and is pending, this is the waker |
| /// for that parked task. |
| </span>read_waker: <span class="prelude-ty">Option</span><Waker>, |
| <span class="doccomment">/// If the `write` side has filled the `max_buf_size` and returned |
| /// `Poll::Pending`, this is the waker for that parked task. |
| </span>write_waker: <span class="prelude-ty">Option</span><Waker>, |
| } |
| |
| <span class="comment">// ===== impl DuplexStream ===== |
| |
| </span><span class="doccomment">/// Create a new pair of `DuplexStream`s that act like a pair of connected sockets. |
| /// |
| /// The `max_buf_size` argument is the maximum amount of bytes that can be |
| /// written to a side before the write returns `Poll::Pending`. |
| </span><span class="attribute">#[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"io-util"</span>)))] |
| </span><span class="kw">pub fn </span>duplex(max_buf_size: usize) -> (DuplexStream, DuplexStream) { |
| <span class="kw">let </span>one = Arc::new(Mutex::new(Pipe::new(max_buf_size))); |
| <span class="kw">let </span>two = Arc::new(Mutex::new(Pipe::new(max_buf_size))); |
| |
| ( |
| DuplexStream { |
| read: one.clone(), |
| write: two.clone(), |
| }, |
| DuplexStream { |
| read: two, |
| write: one, |
| }, |
| ) |
| } |
| |
| <span class="kw">impl </span>AsyncRead <span class="kw">for </span>DuplexStream { |
| <span class="comment">// Previous rustc required this `self` to be `mut`, even though newer |
| // versions recognize it isn't needed to call `lock()`. So for |
| // compatibility, we include the `mut` and `allow` the lint. |
| // |
| // See https://github.com/rust-lang/rust/issues/73592 |
| </span><span class="attribute">#[allow(unused_mut)] |
| </span><span class="kw">fn </span>poll_read( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>task::Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&mut </span>ReadBuf<<span class="lifetime">'_</span>>, |
| ) -> Poll<std::io::Result<()>> { |
| Pin::new(<span class="kw-2">&mut *</span><span class="self">self</span>.read.lock()).poll_read(cx, buf) |
| } |
| } |
| |
| <span class="kw">impl </span>AsyncWrite <span class="kw">for </span>DuplexStream { |
| <span class="attribute">#[allow(unused_mut)] |
| </span><span class="kw">fn </span>poll_write( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>task::Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&</span>[u8], |
| ) -> Poll<std::io::Result<usize>> { |
| Pin::new(<span class="kw-2">&mut *</span><span class="self">self</span>.write.lock()).poll_write(cx, buf) |
| } |
| |
| <span class="attribute">#[allow(unused_mut)] |
| </span><span class="kw">fn </span>poll_flush( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>task::Context<<span class="lifetime">'_</span>>, |
| ) -> Poll<std::io::Result<()>> { |
| Pin::new(<span class="kw-2">&mut *</span><span class="self">self</span>.write.lock()).poll_flush(cx) |
| } |
| |
| <span class="attribute">#[allow(unused_mut)] |
| </span><span class="kw">fn </span>poll_shutdown( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>task::Context<<span class="lifetime">'_</span>>, |
| ) -> Poll<std::io::Result<()>> { |
| Pin::new(<span class="kw-2">&mut *</span><span class="self">self</span>.write.lock()).poll_shutdown(cx) |
| } |
| } |
| |
| <span class="kw">impl </span>Drop <span class="kw">for </span>DuplexStream { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="comment">// notify the other side of the closure |
| </span><span class="self">self</span>.write.lock().close_write(); |
| <span class="self">self</span>.read.lock().close_read(); |
| } |
| } |
| |
| <span class="comment">// ===== impl Pipe ===== |
| |
| </span><span class="kw">impl </span>Pipe { |
| <span class="kw">fn </span>new(max_buf_size: usize) -> <span class="self">Self </span>{ |
| Pipe { |
| buffer: BytesMut::new(), |
| is_closed: <span class="bool-val">false</span>, |
| max_buf_size, |
| read_waker: <span class="prelude-val">None</span>, |
| write_waker: <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>close_write(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.is_closed = <span class="bool-val">true</span>; |
| <span class="comment">// needs to notify any readers that no more data will come |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(waker) = <span class="self">self</span>.read_waker.take() { |
| waker.wake(); |
| } |
| } |
| |
| <span class="kw">fn </span>close_read(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="self">self</span>.is_closed = <span class="bool-val">true</span>; |
| <span class="comment">// needs to notify any writers that they have to abort |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(waker) = <span class="self">self</span>.write_waker.take() { |
| waker.wake(); |
| } |
| } |
| |
| <span class="kw">fn </span>poll_read_internal( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>task::Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&mut </span>ReadBuf<<span class="lifetime">'_</span>>, |
| ) -> Poll<std::io::Result<()>> { |
| <span class="kw">if </span><span class="self">self</span>.buffer.has_remaining() { |
| <span class="kw">let </span>max = <span class="self">self</span>.buffer.remaining().min(buf.remaining()); |
| buf.put_slice(<span class="kw-2">&</span><span class="self">self</span>.buffer[..max]); |
| <span class="self">self</span>.buffer.advance(max); |
| <span class="kw">if </span>max > <span class="number">0 </span>{ |
| <span class="comment">// The passed `buf` might have been empty, don't wake up if |
| // no bytes have been moved. |
| </span><span class="kw">if let </span><span class="prelude-val">Some</span>(waker) = <span class="self">self</span>.write_waker.take() { |
| waker.wake(); |
| } |
| } |
| Poll::Ready(<span class="prelude-val">Ok</span>(())) |
| } <span class="kw">else if </span><span class="self">self</span>.is_closed { |
| Poll::Ready(<span class="prelude-val">Ok</span>(())) |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.read_waker = <span class="prelude-val">Some</span>(cx.waker().clone()); |
| Poll::Pending |
| } |
| } |
| |
| <span class="kw">fn </span>poll_write_internal( |
| <span class="kw-2">mut </span><span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>, |
| cx: <span class="kw-2">&mut </span>task::Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&</span>[u8], |
| ) -> Poll<std::io::Result<usize>> { |
| <span class="kw">if </span><span class="self">self</span>.is_closed { |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(std::io::ErrorKind::BrokenPipe.into())); |
| } |
| <span class="kw">let </span>avail = <span class="self">self</span>.max_buf_size - <span class="self">self</span>.buffer.len(); |
| <span class="kw">if </span>avail == <span class="number">0 </span>{ |
| <span class="self">self</span>.write_waker = <span class="prelude-val">Some</span>(cx.waker().clone()); |
| <span class="kw">return </span>Poll::Pending; |
| } |
| |
| <span class="kw">let </span>len = buf.len().min(avail); |
| <span class="self">self</span>.buffer.extend_from_slice(<span class="kw-2">&</span>buf[..len]); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(waker) = <span class="self">self</span>.read_waker.take() { |
| waker.wake(); |
| } |
| Poll::Ready(<span class="prelude-val">Ok</span>(len)) |
| } |
| } |
| |
| <span class="kw">impl </span>AsyncRead <span class="kw">for </span>Pipe { |
| <span class="macro">cfg_coop! </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>task::Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&mut </span>ReadBuf<<span class="lifetime">'_</span>>, |
| ) -> Poll<std::io::Result<()>> { |
| <span class="kw">let </span>coop = <span class="macro">ready!</span>(<span class="kw">crate</span>::runtime::coop::poll_proceed(cx)); |
| |
| <span class="kw">let </span>ret = <span class="self">self</span>.poll_read_internal(cx, buf); |
| <span class="kw">if </span>ret.is_ready() { |
| coop.made_progress(); |
| } |
| ret |
| } |
| } |
| |
| <span class="macro">cfg_not_coop! </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>task::Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&mut </span>ReadBuf<<span class="lifetime">'_</span>>, |
| ) -> Poll<std::io::Result<()>> { |
| <span class="self">self</span>.poll_read_internal(cx, buf) |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>AsyncWrite <span class="kw">for </span>Pipe { |
| <span class="macro">cfg_coop! </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>task::Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&</span>[u8], |
| ) -> Poll<std::io::Result<usize>> { |
| <span class="kw">let </span>coop = <span class="macro">ready!</span>(<span class="kw">crate</span>::runtime::coop::poll_proceed(cx)); |
| |
| <span class="kw">let </span>ret = <span class="self">self</span>.poll_write_internal(cx, buf); |
| <span class="kw">if </span>ret.is_ready() { |
| coop.made_progress(); |
| } |
| ret |
| } |
| } |
| |
| <span class="macro">cfg_not_coop! </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>task::Context<<span class="lifetime">'_</span>>, |
| buf: <span class="kw-2">&</span>[u8], |
| ) -> Poll<std::io::Result<usize>> { |
| <span class="self">self</span>.poll_write_internal(cx, buf) |
| } |
| } |
| |
| <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>task::Context<<span class="lifetime">'_</span>>) -> Poll<std::io::Result<()>> { |
| Poll::Ready(<span class="prelude-val">Ok</span>(())) |
| } |
| |
| <span class="kw">fn </span>poll_shutdown( |
| <span class="kw-2">mut </span><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>task::Context<<span class="lifetime">'_</span>>, |
| ) -> Poll<std::io::Result<()>> { |
| <span class="self">self</span>.close_write(); |
| Poll::Ready(<span class="prelude-val">Ok</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> |
