| <!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/hyper-0.14.26/src/body/to_bytes.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>to_bytes.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="../../../hyper/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="../../../hyper/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="kw">use </span>bytes::{Buf, BufMut, Bytes}; |
| |
| <span class="kw">use </span><span class="kw">super</span>::HttpBody; |
| |
| <span class="doccomment">/// Concatenate the buffers from a body into a single `Bytes` asynchronously. |
| /// |
| /// This may require copying the data into a single buffer. If you don't need |
| /// a contiguous buffer, prefer the [`aggregate`](crate::body::aggregate()) |
| /// function. |
| /// |
| /// # Note |
| /// |
| /// Care needs to be taken if the remote is untrusted. The function doesn't implement any length |
| /// checks and an malicious peer might make it consume arbitrary amounts of memory. Checking the |
| /// `Content-Length` is a possibility, but it is not strictly mandated to be present. |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// # #[cfg(all(feature = "client", feature = "tcp", any(feature = "http1", feature = "http2")))] |
| /// # async fn doc() -> hyper::Result<()> { |
| /// use hyper::{body::HttpBody}; |
| /// |
| /// # let request = hyper::Request::builder() |
| /// # .method(hyper::Method::POST) |
| /// # .uri("http://httpbin.org/post") |
| /// # .header("content-type", "application/json") |
| /// # .body(hyper::Body::from(r#"{"library":"hyper"}"#)).unwrap(); |
| /// # let client = hyper::Client::new(); |
| /// let response = client.request(request).await?; |
| /// |
| /// const MAX_ALLOWED_RESPONSE_SIZE: u64 = 1024; |
| /// |
| /// let response_content_length = match response.body().size_hint().upper() { |
| /// Some(v) => v, |
| /// None => MAX_ALLOWED_RESPONSE_SIZE + 1 // Just to protect ourselves from a malicious response |
| /// }; |
| /// |
| /// if response_content_length < MAX_ALLOWED_RESPONSE_SIZE { |
| /// let body_bytes = hyper::body::to_bytes(response.into_body()).await?; |
| /// println!("body: {:?}", body_bytes); |
| /// } |
| /// |
| /// # Ok(()) |
| /// # } |
| /// ``` |
| </span><span class="kw">pub async fn </span>to_bytes<T>(body: T) -> <span class="prelude-ty">Result</span><Bytes, T::Error> |
| <span class="kw">where |
| </span>T: HttpBody, |
| { |
| <span class="macro">futures_util::pin_mut!</span>(body); |
| |
| <span class="comment">// If there's only 1 chunk, we can just return Buf::to_bytes() |
| </span><span class="kw">let </span><span class="kw-2">mut </span>first = <span class="kw">if let </span><span class="prelude-val">Some</span>(buf) = body.data().<span class="kw">await </span>{ |
| buf<span class="question-mark">? |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(Bytes::new()); |
| }; |
| |
| <span class="kw">let </span>second = <span class="kw">if let </span><span class="prelude-val">Some</span>(buf) = body.data().<span class="kw">await </span>{ |
| buf<span class="question-mark">? |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(first.copy_to_bytes(first.remaining())); |
| }; |
| |
| <span class="comment">// Don't pre-emptively reserve *too* much. |
| </span><span class="kw">let </span>rest = (body.size_hint().lower() <span class="kw">as </span>usize).min(<span class="number">1024 </span>* <span class="number">16</span>); |
| <span class="kw">let </span>cap = first |
| .remaining() |
| .saturating_add(second.remaining()) |
| .saturating_add(rest); |
| <span class="comment">// With more than 1 buf, we gotta flatten into a Vec first. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>vec = Vec::with_capacity(cap); |
| vec.put(first); |
| vec.put(second); |
| |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(buf) = body.data().<span class="kw">await </span>{ |
| vec.put(buf<span class="question-mark">?</span>); |
| } |
| |
| <span class="prelude-val">Ok</span>(vec.into()) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="hyper" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
