| <!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/http-body-0.4.5/src/limited.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>limited.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="../../http_body/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="../../http_body/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 crate</span>::{Body, SizeHint}; |
| <span class="kw">use </span>bytes::Buf; |
| <span class="kw">use </span>http::HeaderMap; |
| <span class="kw">use </span>pin_project_lite::pin_project; |
| <span class="kw">use </span>std::error::Error; |
| <span class="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::pin::Pin; |
| <span class="kw">use </span>std::task::{Context, Poll}; |
| |
| <span class="macro">pin_project! </span>{ |
| <span class="doccomment">/// A length limited body. |
| /// |
| /// This body will return an error if more than the configured number |
| /// of bytes are returned on polling the wrapped body. |
| </span><span class="attribute">#[derive(Clone, Copy, Debug)] |
| </span><span class="kw">pub struct </span>Limited<B> { |
| remaining: usize, |
| <span class="attribute">#[pin] |
| </span>inner: B, |
| } |
| } |
| |
| <span class="kw">impl</span><B> Limited<B> { |
| <span class="doccomment">/// Create a new `Limited`. |
| </span><span class="kw">pub fn </span>new(inner: B, limit: usize) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| remaining: limit, |
| inner, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><B> Body <span class="kw">for </span>Limited<B> |
| <span class="kw">where |
| </span>B: Body, |
| B::Error: Into<Box<<span class="kw">dyn </span>Error + Send + Sync>>, |
| { |
| <span class="kw">type </span>Data = B::Data; |
| <span class="kw">type </span>Error = Box<<span class="kw">dyn </span>Error + Send + Sync>; |
| |
| <span class="kw">fn </span>poll_data( |
| <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>>, |
| ) -> Poll<<span class="prelude-ty">Option</span><<span class="prelude-ty">Result</span><<span class="self">Self</span>::Data, <span class="self">Self</span>::Error>>> { |
| <span class="kw">let </span>this = <span class="self">self</span>.project(); |
| <span class="kw">let </span>res = <span class="kw">match </span>this.inner.poll_data(cx) { |
| Poll::Pending => <span class="kw">return </span>Poll::Pending, |
| Poll::Ready(<span class="prelude-val">None</span>) => <span class="prelude-val">None</span>, |
| Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(data))) => { |
| <span class="kw">if </span>data.remaining() > <span class="kw-2">*</span>this.remaining { |
| <span class="kw-2">*</span>this.remaining = <span class="number">0</span>; |
| <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(LengthLimitError.into())) |
| } <span class="kw">else </span>{ |
| <span class="kw-2">*</span>this.remaining -= data.remaining(); |
| <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(data)) |
| } |
| } |
| Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(err))) => <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(err.into())), |
| }; |
| |
| Poll::Ready(res) |
| } |
| |
| <span class="kw">fn </span>poll_trailers( |
| <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>>, |
| ) -> Poll<<span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><HeaderMap>, <span class="self">Self</span>::Error>> { |
| <span class="kw">let </span>this = <span class="self">self</span>.project(); |
| <span class="kw">let </span>res = <span class="kw">match </span>this.inner.poll_trailers(cx) { |
| Poll::Pending => <span class="kw">return </span>Poll::Pending, |
| Poll::Ready(<span class="prelude-val">Ok</span>(data)) => <span class="prelude-val">Ok</span>(data), |
| Poll::Ready(<span class="prelude-val">Err</span>(err)) => <span class="prelude-val">Err</span>(err.into()), |
| }; |
| |
| Poll::Ready(res) |
| } |
| |
| <span class="kw">fn </span>is_end_stream(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.inner.is_end_stream() |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> SizeHint { |
| <span class="kw">use </span>std::convert::TryFrom; |
| <span class="kw">match </span>u64::try_from(<span class="self">self</span>.remaining) { |
| <span class="prelude-val">Ok</span>(n) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>hint = <span class="self">self</span>.inner.size_hint(); |
| <span class="kw">if </span>hint.lower() >= n { |
| hint.set_exact(n) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(max) = hint.upper() { |
| hint.set_upper(n.min(max)) |
| } <span class="kw">else </span>{ |
| hint.set_upper(n) |
| } |
| hint |
| } |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="self">self</span>.inner.size_hint(), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// An error returned when body length exceeds the configured limit. |
| </span><span class="attribute">#[derive(Debug)] |
| #[non_exhaustive] |
| </span><span class="kw">pub struct </span>LengthLimitError; |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>LengthLimitError { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| f.write_str(<span class="string">"length limit exceeded"</span>) |
| } |
| } |
| |
| <span class="kw">impl </span>Error <span class="kw">for </span>LengthLimitError {} |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::Full; |
| <span class="kw">use </span>bytes::Bytes; |
| <span class="kw">use </span>std::convert::Infallible; |
| |
| <span class="attribute">#[tokio::test] |
| </span><span class="kw">async fn </span>read_for_body_under_limit_returns_data() { |
| <span class="kw">const </span>DATA: <span class="kw-2">&</span>[u8] = <span class="string">b"testing"</span>; |
| <span class="kw">let </span>inner = Full::new(Bytes::from(DATA)); |
| <span class="kw">let </span>body = <span class="kw-2">&mut </span>Limited::new(inner, <span class="number">8</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>hint = SizeHint::new(); |
| hint.set_upper(<span class="number">7</span>); |
| <span class="macro">assert_eq!</span>(body.size_hint().upper(), hint.upper()); |
| |
| <span class="kw">let </span>data = body.data().<span class="kw">await</span>.unwrap().unwrap(); |
| <span class="macro">assert_eq!</span>(data, DATA); |
| hint.set_upper(<span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(body.size_hint().upper(), hint.upper()); |
| |
| <span class="macro">assert!</span>(<span class="macro">matches!</span>(body.data().<span class="kw">await</span>, <span class="prelude-val">None</span>)); |
| } |
| |
| <span class="attribute">#[tokio::test] |
| </span><span class="kw">async fn </span>read_for_body_over_limit_returns_error() { |
| <span class="kw">const </span>DATA: <span class="kw-2">&</span>[u8] = <span class="string">b"testing a string that is too long"</span>; |
| <span class="kw">let </span>inner = Full::new(Bytes::from(DATA)); |
| <span class="kw">let </span>body = <span class="kw-2">&mut </span>Limited::new(inner, <span class="number">8</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>hint = SizeHint::new(); |
| hint.set_upper(<span class="number">8</span>); |
| <span class="macro">assert_eq!</span>(body.size_hint().upper(), hint.upper()); |
| |
| <span class="kw">let </span>error = body.data().<span class="kw">await</span>.unwrap().unwrap_err(); |
| <span class="macro">assert!</span>(<span class="macro">matches!</span>(error.downcast_ref(), <span class="prelude-val">Some</span>(LengthLimitError))); |
| } |
| |
| <span class="kw">struct </span>Chunky(<span class="kw-2">&</span><span class="lifetime">'static </span>[<span class="kw-2">&</span><span class="lifetime">'static </span>[u8]]); |
| |
| <span class="kw">impl </span>Body <span class="kw">for </span>Chunky { |
| <span class="kw">type </span>Data = <span class="kw-2">&</span><span class="lifetime">'static </span>[u8]; |
| <span class="kw">type </span>Error = Infallible; |
| |
| <span class="kw">fn </span>poll_data( |
| <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>>, |
| ) -> Poll<<span class="prelude-ty">Option</span><<span class="prelude-ty">Result</span><<span class="self">Self</span>::Data, <span class="self">Self</span>::Error>>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>this = <span class="self">self</span>; |
| <span class="kw">match </span>this.<span class="number">0</span>.split_first().map(|(<span class="kw-2">&</span>head, tail)| (<span class="prelude-val">Ok</span>(head), tail)) { |
| <span class="prelude-val">Some</span>((data, new_tail)) => { |
| this.<span class="number">0 </span>= new_tail; |
| |
| Poll::Ready(<span class="prelude-val">Some</span>(data)) |
| } |
| <span class="prelude-val">None </span>=> Poll::Ready(<span class="prelude-val">None</span>), |
| } |
| } |
| |
| <span class="kw">fn </span>poll_trailers( |
| <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>>, |
| ) -> Poll<<span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><HeaderMap>, <span class="self">Self</span>::Error>> { |
| Poll::Ready(<span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>(HeaderMap::new()))) |
| } |
| } |
| |
| <span class="attribute">#[tokio::test] |
| </span><span class="kw">async fn </span>read_for_chunked_body_around_limit_returns_first_chunk_but_returns_error_on_over_limit_chunk( |
| ) { |
| <span class="kw">const </span>DATA: <span class="kw-2">&</span>[<span class="kw-2">&</span>[u8]] = <span class="kw-2">&</span>[<span class="string">b"testing "</span>, <span class="string">b"a string that is too long"</span>]; |
| <span class="kw">let </span>inner = Chunky(DATA); |
| <span class="kw">let </span>body = <span class="kw-2">&mut </span>Limited::new(inner, <span class="number">8</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>hint = SizeHint::new(); |
| hint.set_upper(<span class="number">8</span>); |
| <span class="macro">assert_eq!</span>(body.size_hint().upper(), hint.upper()); |
| |
| <span class="kw">let </span>data = body.data().<span class="kw">await</span>.unwrap().unwrap(); |
| <span class="macro">assert_eq!</span>(data, DATA[<span class="number">0</span>]); |
| hint.set_upper(<span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(body.size_hint().upper(), hint.upper()); |
| |
| <span class="kw">let </span>error = body.data().<span class="kw">await</span>.unwrap().unwrap_err(); |
| <span class="macro">assert!</span>(<span class="macro">matches!</span>(error.downcast_ref(), <span class="prelude-val">Some</span>(LengthLimitError))); |
| } |
| |
| <span class="attribute">#[tokio::test] |
| </span><span class="kw">async fn </span>read_for_chunked_body_over_limit_on_first_chunk_returns_error() { |
| <span class="kw">const </span>DATA: <span class="kw-2">&</span>[<span class="kw-2">&</span>[u8]] = <span class="kw-2">&</span>[<span class="string">b"testing a string"</span>, <span class="string">b" that is too long"</span>]; |
| <span class="kw">let </span>inner = Chunky(DATA); |
| <span class="kw">let </span>body = <span class="kw-2">&mut </span>Limited::new(inner, <span class="number">8</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>hint = SizeHint::new(); |
| hint.set_upper(<span class="number">8</span>); |
| <span class="macro">assert_eq!</span>(body.size_hint().upper(), hint.upper()); |
| |
| <span class="kw">let </span>error = body.data().<span class="kw">await</span>.unwrap().unwrap_err(); |
| <span class="macro">assert!</span>(<span class="macro">matches!</span>(error.downcast_ref(), <span class="prelude-val">Some</span>(LengthLimitError))); |
| } |
| |
| <span class="attribute">#[tokio::test] |
| </span><span class="kw">async fn </span>read_for_chunked_body_under_limit_is_okay() { |
| <span class="kw">const </span>DATA: <span class="kw-2">&</span>[<span class="kw-2">&</span>[u8]] = <span class="kw-2">&</span>[<span class="string">b"test"</span>, <span class="string">b"ing!"</span>]; |
| <span class="kw">let </span>inner = Chunky(DATA); |
| <span class="kw">let </span>body = <span class="kw-2">&mut </span>Limited::new(inner, <span class="number">8</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>hint = SizeHint::new(); |
| hint.set_upper(<span class="number">8</span>); |
| <span class="macro">assert_eq!</span>(body.size_hint().upper(), hint.upper()); |
| |
| <span class="kw">let </span>data = body.data().<span class="kw">await</span>.unwrap().unwrap(); |
| <span class="macro">assert_eq!</span>(data, DATA[<span class="number">0</span>]); |
| hint.set_upper(<span class="number">4</span>); |
| <span class="macro">assert_eq!</span>(body.size_hint().upper(), hint.upper()); |
| |
| <span class="kw">let </span>data = body.data().<span class="kw">await</span>.unwrap().unwrap(); |
| <span class="macro">assert_eq!</span>(data, DATA[<span class="number">1</span>]); |
| hint.set_upper(<span class="number">0</span>); |
| <span class="macro">assert_eq!</span>(body.size_hint().upper(), hint.upper()); |
| |
| <span class="macro">assert!</span>(<span class="macro">matches!</span>(body.data().<span class="kw">await</span>, <span class="prelude-val">None</span>)); |
| } |
| |
| <span class="attribute">#[tokio::test] |
| </span><span class="kw">async fn </span>read_for_trailers_propagates_inner_trailers() { |
| <span class="kw">const </span>DATA: <span class="kw-2">&</span>[<span class="kw-2">&</span>[u8]] = <span class="kw-2">&</span>[<span class="string">b"test"</span>, <span class="string">b"ing!"</span>]; |
| <span class="kw">let </span>inner = Chunky(DATA); |
| <span class="kw">let </span>body = <span class="kw-2">&mut </span>Limited::new(inner, <span class="number">8</span>); |
| <span class="kw">let </span>trailers = body.trailers().<span class="kw">await</span>.unwrap(); |
| <span class="macro">assert_eq!</span>(trailers, <span class="prelude-val">Some</span>(HeaderMap::new())) |
| } |
| |
| <span class="attribute">#[derive(Debug)] |
| </span><span class="kw">enum </span>ErrorBodyError { |
| Data, |
| Trailers, |
| } |
| |
| <span class="kw">impl </span>fmt::Display <span class="kw">for </span>ErrorBodyError { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, _f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl </span>Error <span class="kw">for </span>ErrorBodyError {} |
| |
| <span class="kw">struct </span>ErrorBody; |
| |
| <span class="kw">impl </span>Body <span class="kw">for </span>ErrorBody { |
| <span class="kw">type </span>Data = <span class="kw-2">&</span><span class="lifetime">'static </span>[u8]; |
| <span class="kw">type </span>Error = ErrorBodyError; |
| |
| <span class="kw">fn </span>poll_data( |
| <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>>, |
| ) -> Poll<<span class="prelude-ty">Option</span><<span class="prelude-ty">Result</span><<span class="self">Self</span>::Data, <span class="self">Self</span>::Error>>> { |
| Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(ErrorBodyError::Data))) |
| } |
| |
| <span class="kw">fn </span>poll_trailers( |
| <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>>, |
| ) -> Poll<<span class="prelude-ty">Result</span><<span class="prelude-ty">Option</span><HeaderMap>, <span class="self">Self</span>::Error>> { |
| Poll::Ready(<span class="prelude-val">Err</span>(ErrorBodyError::Trailers)) |
| } |
| } |
| |
| <span class="attribute">#[tokio::test] |
| </span><span class="kw">async fn </span>read_for_body_returning_error_propagates_error() { |
| <span class="kw">let </span>body = <span class="kw-2">&mut </span>Limited::new(ErrorBody, <span class="number">8</span>); |
| <span class="kw">let </span>error = body.data().<span class="kw">await</span>.unwrap().unwrap_err(); |
| <span class="macro">assert!</span>(<span class="macro">matches!</span>(error.downcast_ref(), <span class="prelude-val">Some</span>(ErrorBodyError::Data))); |
| } |
| |
| <span class="attribute">#[tokio::test] |
| </span><span class="kw">async fn </span>trailers_for_body_returning_error_propagates_error() { |
| <span class="kw">let </span>body = <span class="kw-2">&mut </span>Limited::new(ErrorBody, <span class="number">8</span>); |
| <span class="kw">let </span>error = body.trailers().<span class="kw">await</span>.unwrap_err(); |
| <span class="macro">assert!</span>(<span class="macro">matches!</span>( |
| error.downcast_ref(), |
| <span class="prelude-val">Some</span>(ErrorBodyError::Trailers) |
| )); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="http_body" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
