| <!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/tokio-stream-0.1.14/src/stream_ext/chunks_timeout.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>chunks_timeout.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="../../../tokio_stream/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="../../../tokio_stream/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><span class="kw">crate</span>::stream_ext::Fuse; |
| <span class="kw">use </span><span class="kw">crate</span>::Stream; |
| <span class="kw">use </span>tokio::time::{sleep, Sleep}; |
| |
| <span class="kw">use </span>core::future::Future; |
| <span class="kw">use </span>core::pin::Pin; |
| <span class="kw">use </span>core::task::{Context, Poll}; |
| <span class="kw">use </span>pin_project_lite::pin_project; |
| <span class="kw">use </span>std::time::Duration; |
| |
| <span class="macro">pin_project! </span>{ |
| <span class="doccomment">/// Stream returned by the [`chunks_timeout`](super::StreamExt::chunks_timeout) method. |
| </span><span class="attribute">#[must_use = <span class="string">"streams do nothing unless polled"</span>] |
| #[derive(Debug)] |
| </span><span class="kw">pub struct </span>ChunksTimeout<S: Stream> { |
| <span class="attribute">#[pin] |
| </span>stream: Fuse<S>, |
| <span class="attribute">#[pin] |
| </span>deadline: <span class="prelude-ty">Option</span><Sleep>, |
| duration: Duration, |
| items: Vec<S::Item>, |
| cap: usize, <span class="comment">// https://github.com/rust-lang/futures-rs/issues/1475 |
| </span>} |
| } |
| |
| <span class="kw">impl</span><S: Stream> ChunksTimeout<S> { |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(stream: S, max_size: usize, duration: Duration) -> <span class="self">Self </span>{ |
| ChunksTimeout { |
| stream: Fuse::new(stream), |
| deadline: <span class="prelude-val">None</span>, |
| duration, |
| items: Vec::with_capacity(max_size), |
| cap: max_size, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><S: Stream> Stream <span class="kw">for </span>ChunksTimeout<S> { |
| <span class="kw">type </span>Item = Vec<S::Item>; |
| |
| <span class="kw">fn </span>poll_next(<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>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Option</span><<span class="self">Self</span>::Item>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>me = <span class="self">self</span>.as_mut().project(); |
| <span class="kw">loop </span>{ |
| <span class="kw">match </span>me.stream.as_mut().poll_next(cx) { |
| Poll::Pending => <span class="kw">break</span>, |
| Poll::Ready(<span class="prelude-val">Some</span>(item)) => { |
| <span class="kw">if </span>me.items.is_empty() { |
| me.deadline.set(<span class="prelude-val">Some</span>(sleep(<span class="kw-2">*</span>me.duration))); |
| me.items.reserve_exact(<span class="kw-2">*</span>me.cap); |
| } |
| me.items.push(item); |
| <span class="kw">if </span>me.items.len() >= <span class="kw-2">*</span>me.cap { |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Some</span>(std::mem::take(me.items))); |
| } |
| } |
| Poll::Ready(<span class="prelude-val">None</span>) => { |
| <span class="comment">// Returning Some here is only correct because we fuse the inner stream. |
| </span><span class="kw">let </span>last = <span class="kw">if </span>me.items.is_empty() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>(std::mem::take(me.items)) |
| }; |
| |
| <span class="kw">return </span>Poll::Ready(last); |
| } |
| } |
| } |
| |
| <span class="kw">if </span>!me.items.is_empty() { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(deadline) = me.deadline.as_pin_mut() { |
| <span class="macro">ready!</span>(deadline.poll(cx)); |
| } |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Some</span>(std::mem::take(me.items))); |
| } |
| |
| Poll::Pending |
| } |
| |
| <span class="kw">fn </span>size_hint(<span class="kw-2">&</span><span class="self">self</span>) -> (usize, <span class="prelude-ty">Option</span><usize>) { |
| <span class="kw">let </span>chunk_len = <span class="kw">if </span><span class="self">self</span>.items.is_empty() { <span class="number">0 </span>} <span class="kw">else </span>{ <span class="number">1 </span>}; |
| <span class="kw">let </span>(lower, upper) = <span class="self">self</span>.stream.size_hint(); |
| <span class="kw">let </span>lower = (lower / <span class="self">self</span>.cap).saturating_add(chunk_len); |
| <span class="kw">let </span>upper = upper.and_then(|x| x.checked_add(chunk_len)); |
| (lower, upper) |
| } |
| } |
| </code></pre></div> |
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