| <!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/common/date.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>date.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>std::cell::RefCell; |
| <span class="kw">use </span>std::fmt::{<span class="self">self</span>, Write}; |
| <span class="kw">use </span>std::str; |
| <span class="kw">use </span>std::time::{Duration, SystemTime}; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"http2"</span>)] |
| </span><span class="kw">use </span>http::header::HeaderValue; |
| <span class="kw">use </span>httpdate::HttpDate; |
| |
| <span class="comment">// "Sun, 06 Nov 1994 08:49:37 GMT".len() |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>DATE_VALUE_LENGTH: usize = <span class="number">29</span>; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"http1"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>extend(dst: <span class="kw-2">&mut </span>Vec<u8>) { |
| CACHED.with(|cache| { |
| dst.extend_from_slice(cache.borrow().buffer()); |
| }) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"http1"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>update() { |
| CACHED.with(|cache| { |
| cache.borrow_mut().check(); |
| }) |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"http2"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>update_and_header_value() -> HeaderValue { |
| CACHED.with(|cache| { |
| <span class="kw">let </span><span class="kw-2">mut </span>cache = cache.borrow_mut(); |
| cache.check(); |
| HeaderValue::from_bytes(cache.buffer()).expect(<span class="string">"Date format should be valid HeaderValue"</span>) |
| }) |
| } |
| |
| <span class="kw">struct </span>CachedDate { |
| bytes: [u8; DATE_VALUE_LENGTH], |
| pos: usize, |
| next_update: SystemTime, |
| } |
| |
| <span class="macro">thread_local!</span>(<span class="kw">static </span>CACHED: RefCell<CachedDate> = RefCell::new(CachedDate::new())); |
| |
| <span class="kw">impl </span>CachedDate { |
| <span class="kw">fn </span>new() -> <span class="self">Self </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>cache = CachedDate { |
| bytes: [<span class="number">0</span>; DATE_VALUE_LENGTH], |
| pos: <span class="number">0</span>, |
| next_update: SystemTime::now(), |
| }; |
| cache.update(cache.next_update); |
| cache |
| } |
| |
| <span class="kw">fn </span>buffer(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] { |
| <span class="kw-2">&</span><span class="self">self</span>.bytes[..] |
| } |
| |
| <span class="kw">fn </span>check(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">let </span>now = SystemTime::now(); |
| <span class="kw">if </span>now > <span class="self">self</span>.next_update { |
| <span class="self">self</span>.update(now); |
| } |
| } |
| |
| <span class="kw">fn </span>update(<span class="kw-2">&mut </span><span class="self">self</span>, now: SystemTime) { |
| <span class="self">self</span>.render(now); |
| <span class="self">self</span>.next_update = now + Duration::new(<span class="number">1</span>, <span class="number">0</span>); |
| } |
| |
| <span class="kw">fn </span>render(<span class="kw-2">&mut </span><span class="self">self</span>, now: SystemTime) { |
| <span class="self">self</span>.pos = <span class="number">0</span>; |
| <span class="kw">let _ </span>= <span class="macro">write!</span>(<span class="self">self</span>, <span class="string">"{}"</span>, HttpDate::from(now)); |
| <span class="macro">debug_assert!</span>(<span class="self">self</span>.pos == DATE_VALUE_LENGTH); |
| } |
| } |
| |
| <span class="kw">impl </span>fmt::Write <span class="kw">for </span>CachedDate { |
| <span class="kw">fn </span>write_str(<span class="kw-2">&mut </span><span class="self">self</span>, s: <span class="kw-2">&</span>str) -> fmt::Result { |
| <span class="kw">let </span>len = s.len(); |
| <span class="self">self</span>.bytes[<span class="self">self</span>.pos..<span class="self">self</span>.pos + len].copy_from_slice(s.as_bytes()); |
| <span class="self">self</span>.pos += len; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <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="attribute">#[cfg(feature = <span class="string">"nightly"</span>)] |
| </span><span class="kw">use </span>test::Bencher; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_date_len() { |
| <span class="macro">assert_eq!</span>(DATE_VALUE_LENGTH, <span class="string">"Sun, 06 Nov 1994 08:49:37 GMT"</span>.len()); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"nightly"</span>)] |
| #[bench] |
| </span><span class="kw">fn </span>bench_date_check(b: <span class="kw-2">&mut </span>Bencher) { |
| <span class="kw">let </span><span class="kw-2">mut </span>date = CachedDate::new(); |
| <span class="comment">// cache the first update |
| </span>date.check(); |
| |
| b.iter(|| { |
| date.check(); |
| }); |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"nightly"</span>)] |
| #[bench] |
| </span><span class="kw">fn </span>bench_date_render(b: <span class="kw-2">&mut </span>Bencher) { |
| <span class="kw">let </span><span class="kw-2">mut </span>date = CachedDate::new(); |
| <span class="kw">let </span>now = SystemTime::now(); |
| date.render(now); |
| b.bytes = date.buffer().len() <span class="kw">as </span>u64; |
| |
| b.iter(|| { |
| date.render(now); |
| test::black_box(<span class="kw-2">&</span>date); |
| }); |
| } |
| } |
| </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> |
