| <!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/tower-0.4.13/src/util/call_all/common.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>common.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="../../../../tower/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="../../../../tower/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>futures_core::{ready, Stream}; |
| <span class="kw">use </span>pin_project_lite::pin_project; |
| <span class="kw">use </span>std::{ |
| future::Future, |
| pin::Pin, |
| task::{Context, Poll}, |
| }; |
| <span class="kw">use </span>tower_service::Service; |
| |
| <span class="macro">pin_project! </span>{ |
| <span class="doccomment">/// The [`Future`] returned by the [`ServiceExt::call_all`] combinator. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>CallAll<Svc, S, Q> { |
| service: <span class="prelude-ty">Option</span><Svc>, |
| <span class="attribute">#[pin] |
| </span>stream: S, |
| queue: Q, |
| eof: bool, |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">trait </span>Drive<F: Future> { |
| <span class="kw">fn </span>is_empty(<span class="kw-2">&</span><span class="self">self</span>) -> bool; |
| |
| <span class="kw">fn </span>push(<span class="kw-2">&mut </span><span class="self">self</span>, future: F); |
| |
| <span class="kw">fn </span>poll(<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><F::Output>>; |
| } |
| |
| <span class="kw">impl</span><Svc, S, Q> CallAll<Svc, S, Q> |
| <span class="kw">where |
| </span>Svc: Service<S::Item>, |
| Svc::Error: Into<<span class="kw">crate</span>::BoxError>, |
| S: Stream, |
| Q: Drive<Svc::Future>, |
| { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(service: Svc, stream: S, queue: Q) -> CallAll<Svc, S, Q> { |
| CallAll { |
| service: <span class="prelude-val">Some</span>(service), |
| stream, |
| queue, |
| eof: <span class="bool-val">false</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Extract the wrapped [`Service`]. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>into_inner(<span class="kw-2">mut </span><span class="self">self</span>) -> Svc { |
| <span class="self">self</span>.service.take().expect(<span class="string">"Service already taken"</span>) |
| } |
| |
| <span class="doccomment">/// Extract the wrapped [`Service`]. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>take_service(<span class="self">self</span>: Pin<<span class="kw-2">&mut </span><span class="self">Self</span>>) -> Svc { |
| <span class="self">self</span>.project() |
| .service |
| .take() |
| .expect(<span class="string">"Service already taken"</span>) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>unordered(<span class="kw-2">mut </span><span class="self">self</span>) -> <span class="kw">super</span>::CallAllUnordered<Svc, S> { |
| <span class="macro">assert!</span>(<span class="self">self</span>.queue.is_empty() && !<span class="self">self</span>.eof); |
| |
| <span class="kw">super</span>::CallAllUnordered::new(<span class="self">self</span>.service.take().unwrap(), <span class="self">self</span>.stream) |
| } |
| } |
| |
| <span class="kw">impl</span><Svc, S, Q> Stream <span class="kw">for </span>CallAll<Svc, S, Q> |
| <span class="kw">where |
| </span>Svc: Service<S::Item>, |
| Svc::Error: Into<<span class="kw">crate</span>::BoxError>, |
| S: Stream, |
| Q: Drive<Svc::Future>, |
| { |
| <span class="kw">type </span>Item = <span class="prelude-ty">Result</span><Svc::Response, <span class="kw">crate</span>::BoxError>; |
| |
| <span class="kw">fn </span>poll_next(<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>this = <span class="self">self</span>.project(); |
| |
| <span class="kw">loop </span>{ |
| <span class="comment">// First, see if we have any responses to yield |
| </span><span class="kw">if let </span>Poll::Ready(r) = this.queue.poll(cx) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(rsp) = r.transpose().map_err(Into::into)<span class="question-mark">? </span>{ |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(rsp))); |
| } |
| } |
| |
| <span class="comment">// If there are no more requests coming, check if we're done |
| </span><span class="kw">if </span><span class="kw-2">*</span>this.eof { |
| <span class="kw">if </span>this.queue.is_empty() { |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">None</span>); |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span>Poll::Pending; |
| } |
| } |
| |
| <span class="comment">// Then, see that the service is ready for another request |
| </span><span class="kw">let </span>svc = this |
| .service |
| .as_mut() |
| .expect(<span class="string">"Using CallAll after extracing inner Service"</span>); |
| <span class="macro">ready!</span>(svc.poll_ready(cx)).map_err(Into::into)<span class="question-mark">?</span>; |
| |
| <span class="comment">// If it is, gather the next request (if there is one), or return `Pending` if the |
| // stream is not ready. |
| // TODO: We probably want to "release" the slot we reserved in Svc if the |
| // stream returns `Pending`. It may be a while until we get around to actually |
| // using it. |
| </span><span class="kw">match </span><span class="macro">ready!</span>(this.stream.as_mut().poll_next(cx)) { |
| <span class="prelude-val">Some</span>(req) => { |
| this.queue.push(svc.call(req)); |
| } |
| <span class="prelude-val">None </span>=> { |
| <span class="comment">// We're all done once any outstanding requests have completed |
| </span><span class="kw-2">*</span>this.eof = <span class="bool-val">true</span>; |
| } |
| } |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="tower" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
