| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/futures-util-0.3.28/src/io/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../futures_util/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../futures_util/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="doccomment">//! Asynchronous I/O. |
| //! |
| //! This module is the asynchronous version of `std::io`. It defines four |
| //! traits, [`AsyncRead`], [`AsyncWrite`], [`AsyncSeek`], and [`AsyncBufRead`], |
| //! which mirror the `Read`, `Write`, `Seek`, and `BufRead` traits of the |
| //! standard library. However, these traits integrate with the asynchronous |
| //! task system, so that if an I/O object isn't ready for reading (or writing), |
| //! the thread is not blocked, and instead the current task is queued to be |
| //! woken when I/O is ready. |
| //! |
| //! In addition, the [`AsyncReadExt`], [`AsyncWriteExt`], [`AsyncSeekExt`], and |
| //! [`AsyncBufReadExt`] extension traits offer a variety of useful combinators |
| //! for operating with asynchronous I/O objects, including ways to work with |
| //! them using futures, streams and sinks. |
| //! |
| //! This module is only available when the `std` feature of this |
| //! library is activated, and it is activated by default. |
| |
| </span><span class="attribute">#[cfg(feature = <span class="string">"io-compat"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"io-compat"</span>)))] |
| </span><span class="kw">use </span><span class="kw">crate</span>::compat::Compat; |
| <span class="kw">use </span><span class="kw">crate</span>::future::assert_future; |
| <span class="kw">use </span><span class="kw">crate</span>::stream::assert_stream; |
| <span class="kw">use </span>std::{pin::Pin, ptr}; |
| |
| <span class="comment">// Re-export some types from `std::io` so that users don't have to deal |
| // with conflicts when `use`ing `futures::io` and `std::io`. |
| </span><span class="attribute">#[doc(no_inline)] |
| </span><span class="kw">pub use </span>std::io::{Error, ErrorKind, IoSlice, IoSliceMut, <span class="prelude-ty">Result</span>, SeekFrom}; |
| |
| <span class="kw">pub use </span>futures_io::{AsyncBufRead, AsyncRead, AsyncSeek, AsyncWrite}; |
| |
| <span class="comment">// used by `BufReader` and `BufWriter` |
| // https://github.com/rust-lang/rust/blob/master/src/libstd/sys_common/io.rs#L1 |
| </span><span class="kw">const </span>DEFAULT_BUF_SIZE: usize = <span class="number">8 </span>* <span class="number">1024</span>; |
| |
| <span class="doccomment">/// Initializes a buffer if necessary. |
| /// |
| /// A buffer is currently always initialized. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">unsafe fn </span>initialize<R: AsyncRead>(_reader: <span class="kw-2">&</span>R, buf: <span class="kw-2">&mut </span>[u8]) { |
| ptr::write_bytes(buf.as_mut_ptr(), <span class="number">0</span>, buf.len()) |
| } |
| |
| <span class="kw">mod </span>allow_std; |
| <span class="kw">pub use </span><span class="self">self</span>::allow_std::AllowStdIo; |
| |
| <span class="kw">mod </span>buf_reader; |
| <span class="kw">pub use </span><span class="self">self</span>::buf_reader::{BufReader, SeeKRelative}; |
| |
| <span class="kw">mod </span>buf_writer; |
| <span class="kw">pub use </span><span class="self">self</span>::buf_writer::BufWriter; |
| |
| <span class="kw">mod </span>line_writer; |
| <span class="kw">pub use </span><span class="self">self</span>::line_writer::LineWriter; |
| |
| <span class="kw">mod </span>chain; |
| <span class="kw">pub use </span><span class="self">self</span>::chain::Chain; |
| |
| <span class="kw">mod </span>close; |
| <span class="kw">pub use </span><span class="self">self</span>::close::Close; |
| |
| <span class="kw">mod </span>copy; |
| <span class="kw">pub use </span><span class="self">self</span>::copy::{copy, Copy}; |
| |
| <span class="kw">mod </span>copy_buf; |
| <span class="kw">pub use </span><span class="self">self</span>::copy_buf::{copy_buf, CopyBuf}; |
| |
| <span class="kw">mod </span>copy_buf_abortable; |
| <span class="kw">pub use </span><span class="self">self</span>::copy_buf_abortable::{copy_buf_abortable, CopyBufAbortable}; |
| |
| <span class="kw">mod </span>cursor; |
| <span class="kw">pub use </span><span class="self">self</span>::cursor::Cursor; |
| |
| <span class="kw">mod </span>empty; |
| <span class="kw">pub use </span><span class="self">self</span>::empty::{empty, Empty}; |
| |
| <span class="kw">mod </span>fill_buf; |
| <span class="kw">pub use </span><span class="self">self</span>::fill_buf::FillBuf; |
| |
| <span class="kw">mod </span>flush; |
| <span class="kw">pub use </span><span class="self">self</span>::flush::Flush; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"sink"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"sink"</span>)))] |
| </span><span class="kw">mod </span>into_sink; |
| <span class="attribute">#[cfg(feature = <span class="string">"sink"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"sink"</span>)))] |
| </span><span class="kw">pub use </span><span class="self">self</span>::into_sink::IntoSink; |
| |
| <span class="kw">mod </span>lines; |
| <span class="kw">pub use </span><span class="self">self</span>::lines::Lines; |
| |
| <span class="kw">mod </span>read; |
| <span class="kw">pub use </span><span class="self">self</span>::read::Read; |
| |
| <span class="kw">mod </span>read_vectored; |
| <span class="kw">pub use </span><span class="self">self</span>::read_vectored::ReadVectored; |
| |
| <span class="kw">mod </span>read_exact; |
| <span class="kw">pub use </span><span class="self">self</span>::read_exact::ReadExact; |
| |
| <span class="kw">mod </span>read_line; |
| <span class="kw">pub use </span><span class="self">self</span>::read_line::ReadLine; |
| |
| <span class="kw">mod </span>read_to_end; |
| <span class="kw">pub use </span><span class="self">self</span>::read_to_end::ReadToEnd; |
| |
| <span class="kw">mod </span>read_to_string; |
| <span class="kw">pub use </span><span class="self">self</span>::read_to_string::ReadToString; |
| |
| <span class="kw">mod </span>read_until; |
| <span class="kw">pub use </span><span class="self">self</span>::read_until::ReadUntil; |
| |
| <span class="kw">mod </span>repeat; |
| <span class="kw">pub use </span><span class="self">self</span>::repeat::{repeat, Repeat}; |
| |
| <span class="kw">mod </span>seek; |
| <span class="kw">pub use </span><span class="self">self</span>::seek::Seek; |
| |
| <span class="kw">mod </span>sink; |
| <span class="kw">pub use </span><span class="self">self</span>::sink::{sink, Sink}; |
| |
| <span class="kw">mod </span>split; |
| <span class="kw">pub use </span><span class="self">self</span>::split::{ReadHalf, ReuniteError, WriteHalf}; |
| |
| <span class="kw">mod </span>take; |
| <span class="kw">pub use </span><span class="self">self</span>::take::Take; |
| |
| <span class="kw">mod </span>window; |
| <span class="kw">pub use </span><span class="self">self</span>::window::Window; |
| |
| <span class="kw">mod </span>write; |
| <span class="kw">pub use </span><span class="self">self</span>::write::Write; |
| |
| <span class="kw">mod </span>write_vectored; |
| <span class="kw">pub use </span><span class="self">self</span>::write_vectored::WriteVectored; |
| |
| <span class="kw">mod </span>write_all; |
| <span class="kw">pub use </span><span class="self">self</span>::write_all::WriteAll; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"write-all-vectored"</span>)] |
| </span><span class="kw">mod </span>write_all_vectored; |
| <span class="attribute">#[cfg(feature = <span class="string">"write-all-vectored"</span>)] |
| </span><span class="kw">pub use </span><span class="self">self</span>::write_all_vectored::WriteAllVectored; |
| |
| <span class="doccomment">/// An extension trait which adds utility methods to `AsyncRead` types. |
| </span><span class="kw">pub trait </span>AsyncReadExt: AsyncRead { |
| <span class="doccomment">/// Creates an adaptor which will chain this stream with another. |
| /// |
| /// The returned `AsyncRead` instance will first read all bytes from this object |
| /// until EOF is encountered. Afterwards the output is equivalent to the |
| /// output of `next`. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{AsyncReadExt, Cursor}; |
| /// |
| /// let reader1 = Cursor::new([1, 2, 3, 4]); |
| /// let reader2 = Cursor::new([5, 6, 7, 8]); |
| /// |
| /// let mut reader = reader1.chain(reader2); |
| /// let mut buffer = Vec::new(); |
| /// |
| /// // read the value into a Vec. |
| /// reader.read_to_end(&mut buffer).await?; |
| /// assert_eq!(buffer, [1, 2, 3, 4, 5, 6, 7, 8]); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>chain<R>(<span class="self">self</span>, next: R) -> Chain<<span class="self">Self</span>, R> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| R: AsyncRead, |
| { |
| assert_read(Chain::new(<span class="self">self</span>, next)) |
| } |
| |
| <span class="doccomment">/// Tries to read some bytes directly into the given `buf` in asynchronous |
| /// manner, returning a future type. |
| /// |
| /// The returned future will resolve to the number of bytes read once the read |
| /// operation is completed. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{AsyncReadExt, Cursor}; |
| /// |
| /// let mut reader = Cursor::new([1, 2, 3, 4]); |
| /// let mut output = [0u8; 5]; |
| /// |
| /// let bytes = reader.read(&mut output[..]).await?; |
| /// |
| /// // This is only guaranteed to be 4 because `&[u8]` is a synchronous |
| /// // reader. In a real system you could get anywhere from 1 to |
| /// // `output.len()` bytes in a single read. |
| /// assert_eq!(bytes, 4); |
| /// assert_eq!(output, [1, 2, 3, 4, 0]); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>read<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>[u8]) -> Read<<span class="lifetime">'a</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><usize>, <span class="kw">_</span>>(Read::new(<span class="self">self</span>, buf)) |
| } |
| |
| <span class="doccomment">/// Creates a future which will read from the `AsyncRead` into `bufs` using vectored |
| /// IO operations. |
| /// |
| /// The returned future will resolve to the number of bytes read once the read |
| /// operation is completed. |
| </span><span class="kw">fn </span>read_vectored<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>, bufs: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>[IoSliceMut<<span class="lifetime">'a</span>>]) -> ReadVectored<<span class="lifetime">'a</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><usize>, <span class="kw">_</span>>(ReadVectored::new(<span class="self">self</span>, bufs)) |
| } |
| |
| <span class="doccomment">/// Creates a future which will read exactly enough bytes to fill `buf`, |
| /// returning an error if end of file (EOF) is hit sooner. |
| /// |
| /// The returned future will resolve once the read operation is completed. |
| /// |
| /// In the case of an error the buffer and the object will be discarded, with |
| /// the error yielded. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{AsyncReadExt, Cursor}; |
| /// |
| /// let mut reader = Cursor::new([1, 2, 3, 4]); |
| /// let mut output = [0u8; 4]; |
| /// |
| /// reader.read_exact(&mut output).await?; |
| /// |
| /// assert_eq!(output, [1, 2, 3, 4]); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| /// |
| /// ## EOF is hit before `buf` is filled |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{self, AsyncReadExt, Cursor}; |
| /// |
| /// let mut reader = Cursor::new([1, 2, 3, 4]); |
| /// let mut output = [0u8; 5]; |
| /// |
| /// let result = reader.read_exact(&mut output).await; |
| /// |
| /// assert_eq!(result.unwrap_err().kind(), io::ErrorKind::UnexpectedEof); |
| /// # }); |
| /// ``` |
| </span><span class="kw">fn </span>read_exact<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>[u8]) -> ReadExact<<span class="lifetime">'a</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><()>, <span class="kw">_</span>>(ReadExact::new(<span class="self">self</span>, buf)) |
| } |
| |
| <span class="doccomment">/// Creates a future which will read all the bytes from this `AsyncRead`. |
| /// |
| /// On success the total number of bytes read is returned. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{AsyncReadExt, Cursor}; |
| /// |
| /// let mut reader = Cursor::new([1, 2, 3, 4]); |
| /// let mut output = Vec::with_capacity(4); |
| /// |
| /// let bytes = reader.read_to_end(&mut output).await?; |
| /// |
| /// assert_eq!(bytes, 4); |
| /// assert_eq!(output, vec![1, 2, 3, 4]); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>read_to_end<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Vec<u8>) -> ReadToEnd<<span class="lifetime">'a</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><usize>, <span class="kw">_</span>>(ReadToEnd::new(<span class="self">self</span>, buf)) |
| } |
| |
| <span class="doccomment">/// Creates a future which will read all the bytes from this `AsyncRead`. |
| /// |
| /// On success the total number of bytes read is returned. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{AsyncReadExt, Cursor}; |
| /// |
| /// let mut reader = Cursor::new(&b"1234"[..]); |
| /// let mut buffer = String::with_capacity(4); |
| /// |
| /// let bytes = reader.read_to_string(&mut buffer).await?; |
| /// |
| /// assert_eq!(bytes, 4); |
| /// assert_eq!(buffer, String::from("1234")); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>read_to_string<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>String) -> ReadToString<<span class="lifetime">'a</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><usize>, <span class="kw">_</span>>(ReadToString::new(<span class="self">self</span>, buf)) |
| } |
| |
| <span class="doccomment">/// Helper method for splitting this read/write object into two halves. |
| /// |
| /// The two halves returned implement the `AsyncRead` and `AsyncWrite` |
| /// traits, respectively. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{self, AsyncReadExt, Cursor}; |
| /// |
| /// // Note that for `Cursor` the read and write halves share a single |
| /// // seek position. This may or may not be true for other types that |
| /// // implement both `AsyncRead` and `AsyncWrite`. |
| /// |
| /// let reader = Cursor::new([1, 2, 3, 4]); |
| /// let mut buffer = Cursor::new(vec![0, 0, 0, 0, 5, 6, 7, 8]); |
| /// let mut writer = Cursor::new(vec![0u8; 5]); |
| /// |
| /// { |
| /// let (buffer_reader, mut buffer_writer) = (&mut buffer).split(); |
| /// io::copy(reader, &mut buffer_writer).await?; |
| /// io::copy(buffer_reader, &mut writer).await?; |
| /// } |
| /// |
| /// assert_eq!(buffer.into_inner(), [1, 2, 3, 4, 5, 6, 7, 8]); |
| /// assert_eq!(writer.into_inner(), [5, 6, 7, 8, 0]); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>split(<span class="self">self</span>) -> (ReadHalf<<span class="self">Self</span>>, WriteHalf<<span class="self">Self</span>>) |
| <span class="kw">where |
| </span><span class="self">Self</span>: AsyncWrite + Sized, |
| { |
| <span class="kw">let </span>(r, w) = split::split(<span class="self">self</span>); |
| (assert_read(r), assert_write(w)) |
| } |
| |
| <span class="doccomment">/// Creates an AsyncRead adapter which will read at most `limit` bytes |
| /// from the underlying reader. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{AsyncReadExt, Cursor}; |
| /// |
| /// let reader = Cursor::new(&b"12345678"[..]); |
| /// let mut buffer = [0; 5]; |
| /// |
| /// let mut take = reader.take(4); |
| /// let n = take.read(&mut buffer).await?; |
| /// |
| /// assert_eq!(n, 4); |
| /// assert_eq!(&buffer, b"1234\0"); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>take(<span class="self">self</span>, limit: u64) -> Take<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| { |
| assert_read(Take::new(<span class="self">self</span>, limit)) |
| } |
| |
| <span class="doccomment">/// Wraps an [`AsyncRead`] in a compatibility wrapper that allows it to be |
| /// used as a futures 0.1 / tokio-io 0.1 `AsyncRead`. If the wrapped type |
| /// implements [`AsyncWrite`] as well, the result will also implement the |
| /// futures 0.1 / tokio 0.1 `AsyncWrite` trait. |
| /// |
| /// Requires the `io-compat` feature to enable. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"io-compat"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"io-compat"</span>)))] |
| </span><span class="kw">fn </span>compat(<span class="self">self</span>) -> Compat<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized + Unpin, |
| { |
| Compat::new(<span class="self">self</span>) |
| } |
| } |
| |
| <span class="kw">impl</span><R: AsyncRead + <span class="question-mark">?</span>Sized> AsyncReadExt <span class="kw">for </span>R {} |
| |
| <span class="doccomment">/// An extension trait which adds utility methods to `AsyncWrite` types. |
| </span><span class="kw">pub trait </span>AsyncWriteExt: AsyncWrite { |
| <span class="doccomment">/// Creates a future which will entirely flush this `AsyncWrite`. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{AllowStdIo, AsyncWriteExt}; |
| /// use std::io::{BufWriter, Cursor}; |
| /// |
| /// let mut output = vec![0u8; 5]; |
| /// |
| /// { |
| /// let writer = Cursor::new(&mut output); |
| /// let mut buffered = AllowStdIo::new(BufWriter::new(writer)); |
| /// buffered.write_all(&[1, 2]).await?; |
| /// buffered.write_all(&[3, 4]).await?; |
| /// buffered.flush().await?; |
| /// } |
| /// |
| /// assert_eq!(output, [1, 2, 3, 4, 0]); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> Flush<<span class="lifetime">'_</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><()>, <span class="kw">_</span>>(Flush::new(<span class="self">self</span>)) |
| } |
| |
| <span class="doccomment">/// Creates a future which will entirely close this `AsyncWrite`. |
| </span><span class="kw">fn </span>close(<span class="kw-2">&mut </span><span class="self">self</span>) -> Close<<span class="lifetime">'_</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><()>, <span class="kw">_</span>>(Close::new(<span class="self">self</span>)) |
| } |
| |
| <span class="doccomment">/// Creates a future which will write bytes from `buf` into the object. |
| /// |
| /// The returned future will resolve to the number of bytes written once the write |
| /// operation is completed. |
| </span><span class="kw">fn </span>write<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> Write<<span class="lifetime">'a</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><usize>, <span class="kw">_</span>>(Write::new(<span class="self">self</span>, buf)) |
| } |
| |
| <span class="doccomment">/// Creates a future which will write bytes from `bufs` into the object using vectored |
| /// IO operations. |
| /// |
| /// The returned future will resolve to the number of bytes written once the write |
| /// operation is completed. |
| </span><span class="kw">fn </span>write_vectored<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>, bufs: <span class="kw-2">&</span><span class="lifetime">'a </span>[IoSlice<<span class="lifetime">'a</span>>]) -> WriteVectored<<span class="lifetime">'a</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><usize>, <span class="kw">_</span>>(WriteVectored::new(<span class="self">self</span>, bufs)) |
| } |
| |
| <span class="doccomment">/// Write data into this object. |
| /// |
| /// Creates a future that will write the entire contents of the buffer `buf` into |
| /// this `AsyncWrite`. |
| /// |
| /// The returned future will not complete until all the data has been written. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{AsyncWriteExt, Cursor}; |
| /// |
| /// let mut writer = Cursor::new(vec![0u8; 5]); |
| /// |
| /// writer.write_all(&[1, 2, 3, 4]).await?; |
| /// |
| /// assert_eq!(writer.into_inner(), [1, 2, 3, 4, 0]); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>write_all<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> WriteAll<<span class="lifetime">'a</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><()>, <span class="kw">_</span>>(WriteAll::new(<span class="self">self</span>, buf)) |
| } |
| |
| <span class="doccomment">/// Attempts to write multiple buffers into this writer. |
| /// |
| /// Creates a future that will write the entire contents of `bufs` into this |
| /// `AsyncWrite` using [vectored writes]. |
| /// |
| /// The returned future will not complete until all the data has been |
| /// written. |
| /// |
| /// [vectored writes]: std::io::Write::write_vectored |
| /// |
| /// # Notes |
| /// |
| /// Unlike `io::Write::write_vectored`, this takes a *mutable* reference to |
| /// a slice of `IoSlice`s, not an immutable one. That's because we need to |
| /// modify the slice to keep track of the bytes already written. |
| /// |
| /// Once this futures returns, the contents of `bufs` are unspecified, as |
| /// this depends on how many calls to `write_vectored` were necessary. It is |
| /// best to understand this function as taking ownership of `bufs` and to |
| /// not use `bufs` afterwards. The underlying buffers, to which the |
| /// `IoSlice`s point (but not the `IoSlice`s themselves), are unchanged and |
| /// can be reused. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::AsyncWriteExt; |
| /// use futures_util::io::Cursor; |
| /// use std::io::IoSlice; |
| /// |
| /// let mut writer = Cursor::new(Vec::new()); |
| /// let bufs = &mut [ |
| /// IoSlice::new(&[1]), |
| /// IoSlice::new(&[2, 3]), |
| /// IoSlice::new(&[4, 5, 6]), |
| /// ]; |
| /// |
| /// writer.write_all_vectored(bufs).await?; |
| /// // Note: the contents of `bufs` is now unspecified, see the Notes section. |
| /// |
| /// assert_eq!(writer.into_inner(), &[1, 2, 3, 4, 5, 6]); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"write-all-vectored"</span>)] |
| </span><span class="kw">fn </span>write_all_vectored<<span class="lifetime">'a</span>>( |
| <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>, |
| bufs: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>[IoSlice<<span class="lifetime">'a</span>>], |
| ) -> WriteAllVectored<<span class="lifetime">'a</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><()>, <span class="kw">_</span>>(WriteAllVectored::new(<span class="self">self</span>, bufs)) |
| } |
| |
| <span class="doccomment">/// Wraps an [`AsyncWrite`] in a compatibility wrapper that allows it to be |
| /// used as a futures 0.1 / tokio-io 0.1 `AsyncWrite`. |
| /// Requires the `io-compat` feature to enable. |
| </span><span class="attribute">#[cfg(feature = <span class="string">"io-compat"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"io-compat"</span>)))] |
| </span><span class="kw">fn </span>compat_write(<span class="self">self</span>) -> Compat<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized + Unpin, |
| { |
| Compat::new(<span class="self">self</span>) |
| } |
| |
| <span class="doccomment">/// Allow using an [`AsyncWrite`] as a [`Sink`](futures_sink::Sink)`<Item: AsRef<[u8]>>`. |
| /// |
| /// This adapter produces a sink that will write each value passed to it |
| /// into the underlying writer. |
| /// |
| /// Note that this function consumes the given writer, returning a wrapped |
| /// version. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::AsyncWriteExt; |
| /// use futures::stream::{self, StreamExt}; |
| /// |
| /// let stream = stream::iter(vec![Ok([1, 2, 3]), Ok([4, 5, 6])]); |
| /// |
| /// let mut writer = vec![]; |
| /// |
| /// stream.forward((&mut writer).into_sink()).await?; |
| /// |
| /// assert_eq!(writer, vec![1, 2, 3, 4, 5, 6]); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) |
| /// # })?; |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) |
| /// ``` |
| </span><span class="attribute">#[cfg(feature = <span class="string">"sink"</span>)] |
| #[cfg_attr(docsrs, doc(cfg(feature = <span class="string">"sink"</span>)))] |
| </span><span class="kw">fn </span>into_sink<Item: AsRef<[u8]>>(<span class="self">self</span>) -> IntoSink<<span class="self">Self</span>, Item> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| { |
| <span class="kw">crate</span>::sink::assert_sink::<Item, Error, <span class="kw">_</span>>(IntoSink::new(<span class="self">self</span>)) |
| } |
| } |
| |
| <span class="kw">impl</span><W: AsyncWrite + <span class="question-mark">?</span>Sized> AsyncWriteExt <span class="kw">for </span>W {} |
| |
| <span class="doccomment">/// An extension trait which adds utility methods to `AsyncSeek` types. |
| </span><span class="kw">pub trait </span>AsyncSeekExt: AsyncSeek { |
| <span class="doccomment">/// Creates a future which will seek an IO object, and then yield the |
| /// new position in the object and the object itself. |
| /// |
| /// In the case of an error the buffer and the object will be discarded, with |
| /// the error yielded. |
| </span><span class="kw">fn </span>seek(<span class="kw-2">&mut </span><span class="self">self</span>, pos: SeekFrom) -> Seek<<span class="lifetime">'_</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><u64>, <span class="kw">_</span>>(Seek::new(<span class="self">self</span>, pos)) |
| } |
| |
| <span class="doccomment">/// Creates a future which will return the current seek position from the |
| /// start of the stream. |
| /// |
| /// This is equivalent to `self.seek(SeekFrom::Current(0))`. |
| </span><span class="kw">fn </span>stream_position(<span class="kw-2">&mut </span><span class="self">self</span>) -> Seek<<span class="lifetime">'_</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| <span class="self">self</span>.seek(SeekFrom::Current(<span class="number">0</span>)) |
| } |
| } |
| |
| <span class="kw">impl</span><S: AsyncSeek + <span class="question-mark">?</span>Sized> AsyncSeekExt <span class="kw">for </span>S {} |
| |
| <span class="doccomment">/// An extension trait which adds utility methods to `AsyncBufRead` types. |
| </span><span class="kw">pub trait </span>AsyncBufReadExt: AsyncBufRead { |
| <span class="doccomment">/// Creates a future which will wait for a non-empty buffer to be available from this I/O |
| /// object or EOF to be reached. |
| /// |
| /// This method is the async equivalent to [`BufRead::fill_buf`](std::io::BufRead::fill_buf). |
| /// |
| /// ```rust |
| /// # futures::executor::block_on(async { |
| /// use futures::{io::AsyncBufReadExt as _, stream::{iter, TryStreamExt as _}}; |
| /// |
| /// let mut stream = iter(vec![Ok(vec![1, 2, 3]), Ok(vec![4, 5, 6])]).into_async_read(); |
| /// |
| /// assert_eq!(stream.fill_buf().await?, vec![1, 2, 3]); |
| /// stream.consume_unpin(2); |
| /// |
| /// assert_eq!(stream.fill_buf().await?, vec![3]); |
| /// stream.consume_unpin(1); |
| /// |
| /// assert_eq!(stream.fill_buf().await?, vec![4, 5, 6]); |
| /// stream.consume_unpin(3); |
| /// |
| /// assert_eq!(stream.fill_buf().await?, vec![]); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>fill_buf(<span class="kw-2">&mut </span><span class="self">self</span>) -> FillBuf<<span class="lifetime">'_</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><<span class="kw-2">&</span>[u8]>, <span class="kw">_</span>>(FillBuf::new(<span class="self">self</span>)) |
| } |
| |
| <span class="doccomment">/// A convenience for calling [`AsyncBufRead::consume`] on [`Unpin`] IO types. |
| /// |
| /// ```rust |
| /// # futures::executor::block_on(async { |
| /// use futures::{io::AsyncBufReadExt as _, stream::{iter, TryStreamExt as _}}; |
| /// |
| /// let mut stream = iter(vec![Ok(vec![1, 2, 3])]).into_async_read(); |
| /// |
| /// assert_eq!(stream.fill_buf().await?, vec![1, 2, 3]); |
| /// stream.consume_unpin(2); |
| /// |
| /// assert_eq!(stream.fill_buf().await?, vec![3]); |
| /// stream.consume_unpin(1); |
| /// |
| /// assert_eq!(stream.fill_buf().await?, vec![]); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>consume_unpin(<span class="kw-2">&mut </span><span class="self">self</span>, amt: usize) |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| Pin::new(<span class="self">self</span>).consume(amt) |
| } |
| |
| <span class="doccomment">/// Creates a future which will read all the bytes associated with this I/O |
| /// object into `buf` until the delimiter `byte` or EOF is reached. |
| /// This method is the async equivalent to [`BufRead::read_until`](std::io::BufRead::read_until). |
| /// |
| /// This function will read bytes from the underlying stream until the |
| /// delimiter or EOF is found. Once found, all bytes up to, and including, |
| /// the delimiter (if found) will be appended to `buf`. |
| /// |
| /// The returned future will resolve to the number of bytes read once the read |
| /// operation is completed. |
| /// |
| /// In the case of an error the buffer and the object will be discarded, with |
| /// the error yielded. |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{AsyncBufReadExt, Cursor}; |
| /// |
| /// let mut cursor = Cursor::new(b"lorem-ipsum"); |
| /// let mut buf = vec![]; |
| /// |
| /// // cursor is at 'l' |
| /// let num_bytes = cursor.read_until(b'-', &mut buf).await?; |
| /// assert_eq!(num_bytes, 6); |
| /// assert_eq!(buf, b"lorem-"); |
| /// buf.clear(); |
| /// |
| /// // cursor is at 'i' |
| /// let num_bytes = cursor.read_until(b'-', &mut buf).await?; |
| /// assert_eq!(num_bytes, 5); |
| /// assert_eq!(buf, b"ipsum"); |
| /// buf.clear(); |
| /// |
| /// // cursor is at EOF |
| /// let num_bytes = cursor.read_until(b'-', &mut buf).await?; |
| /// assert_eq!(num_bytes, 0); |
| /// assert_eq!(buf, b""); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>read_until<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>, byte: u8, buf: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Vec<u8>) -> ReadUntil<<span class="lifetime">'a</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><usize>, <span class="kw">_</span>>(ReadUntil::new(<span class="self">self</span>, byte, buf)) |
| } |
| |
| <span class="doccomment">/// Creates a future which will read all the bytes associated with this I/O |
| /// object into `buf` until a newline (the 0xA byte) or EOF is reached, |
| /// This method is the async equivalent to [`BufRead::read_line`](std::io::BufRead::read_line). |
| /// |
| /// This function will read bytes from the underlying stream until the |
| /// newline delimiter (the 0xA byte) or EOF is found. Once found, all bytes |
| /// up to, and including, the delimiter (if found) will be appended to |
| /// `buf`. |
| /// |
| /// The returned future will resolve to the number of bytes read once the read |
| /// operation is completed. |
| /// |
| /// In the case of an error the buffer and the object will be discarded, with |
| /// the error yielded. |
| /// |
| /// # Errors |
| /// |
| /// This function has the same error semantics as [`read_until`] and will |
| /// also return an error if the read bytes are not valid UTF-8. If an I/O |
| /// error is encountered then `buf` may contain some bytes already read in |
| /// the event that all data read so far was valid UTF-8. |
| /// |
| /// [`read_until`]: AsyncBufReadExt::read_until |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{AsyncBufReadExt, Cursor}; |
| /// |
| /// let mut cursor = Cursor::new(b"foo\nbar"); |
| /// let mut buf = String::new(); |
| /// |
| /// // cursor is at 'f' |
| /// let num_bytes = cursor.read_line(&mut buf).await?; |
| /// assert_eq!(num_bytes, 4); |
| /// assert_eq!(buf, "foo\n"); |
| /// buf.clear(); |
| /// |
| /// // cursor is at 'b' |
| /// let num_bytes = cursor.read_line(&mut buf).await?; |
| /// assert_eq!(num_bytes, 3); |
| /// assert_eq!(buf, "bar"); |
| /// buf.clear(); |
| /// |
| /// // cursor is at EOF |
| /// let num_bytes = cursor.read_line(&mut buf).await?; |
| /// assert_eq!(num_bytes, 0); |
| /// assert_eq!(buf, ""); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>read_line<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>, buf: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>String) -> ReadLine<<span class="lifetime">'a</span>, <span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Unpin, |
| { |
| assert_future::<<span class="prelude-ty">Result</span><usize>, <span class="kw">_</span>>(ReadLine::new(<span class="self">self</span>, buf)) |
| } |
| |
| <span class="doccomment">/// Returns a stream over the lines of this reader. |
| /// This method is the async equivalent to [`BufRead::lines`](std::io::BufRead::lines). |
| /// |
| /// The stream returned from this function will yield instances of |
| /// [`io::Result`]`<`[`String`]`>`. Each string returned will *not* have a newline |
| /// byte (the 0xA byte) or CRLF (0xD, 0xA bytes) at the end. |
| /// |
| /// [`io::Result`]: std::io::Result |
| /// [`String`]: String |
| /// |
| /// # Errors |
| /// |
| /// Each line of the stream has the same error semantics as [`AsyncBufReadExt::read_line`]. |
| /// |
| /// [`AsyncBufReadExt::read_line`]: AsyncBufReadExt::read_line |
| /// |
| /// # Examples |
| /// |
| /// ``` |
| /// # futures::executor::block_on(async { |
| /// use futures::io::{AsyncBufReadExt, Cursor}; |
| /// use futures::stream::StreamExt; |
| /// |
| /// let cursor = Cursor::new(b"lorem\nipsum\r\ndolor"); |
| /// |
| /// let mut lines_stream = cursor.lines().map(|l| l.unwrap()); |
| /// assert_eq!(lines_stream.next().await, Some(String::from("lorem"))); |
| /// assert_eq!(lines_stream.next().await, Some(String::from("ipsum"))); |
| /// assert_eq!(lines_stream.next().await, Some(String::from("dolor"))); |
| /// assert_eq!(lines_stream.next().await, None); |
| /// # Ok::<(), Box<dyn std::error::Error>>(()) }).unwrap(); |
| /// ``` |
| </span><span class="kw">fn </span>lines(<span class="self">self</span>) -> Lines<<span class="self">Self</span>> |
| <span class="kw">where |
| </span><span class="self">Self</span>: Sized, |
| { |
| assert_stream::<<span class="prelude-ty">Result</span><String>, <span class="kw">_</span>>(Lines::new(<span class="self">self</span>)) |
| } |
| } |
| |
| <span class="kw">impl</span><R: AsyncBufRead + <span class="question-mark">?</span>Sized> AsyncBufReadExt <span class="kw">for </span>R {} |
| |
| <span class="comment">// Just a helper function to ensure the reader we're returning all have the |
| // right implementations. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>assert_read<R>(reader: R) -> R |
| <span class="kw">where |
| </span>R: AsyncRead, |
| { |
| reader |
| } |
| <span class="comment">// Just a helper function to ensure the writer we're returning all have the |
| // right implementations. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>assert_write<W>(writer: W) -> W |
| <span class="kw">where |
| </span>W: AsyncWrite, |
| { |
| writer |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="futures_util" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
