| <!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/buffer/future.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>future.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="doccomment">//! Future types for the [`Buffer`] middleware. |
| //! |
| //! [`Buffer`]: crate::buffer::Buffer |
| |
| </span><span class="kw">use super</span>::{error::Closed, message}; |
| <span class="kw">use </span>futures_core::ready; |
| <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="macro">pin_project! </span>{ |
| <span class="doccomment">/// Future that completes when the buffered service eventually services the submitted request. |
| </span><span class="attribute">#[derive(Debug)] |
| </span><span class="kw">pub struct </span>ResponseFuture<T> { |
| <span class="attribute">#[pin] |
| </span>state: ResponseState<T>, |
| } |
| } |
| |
| <span class="macro">pin_project! </span>{ |
| <span class="attribute">#[project = ResponseStateProj] |
| #[derive(Debug)] |
| </span><span class="kw">enum </span>ResponseState<T> { |
| Failed { |
| error: <span class="prelude-ty">Option</span><<span class="kw">crate</span>::BoxError>, |
| }, |
| Rx { |
| <span class="attribute">#[pin] |
| </span>rx: message::Rx<T>, |
| }, |
| Poll { |
| <span class="attribute">#[pin] |
| </span>fut: T, |
| }, |
| } |
| } |
| |
| <span class="kw">impl</span><T> ResponseFuture<T> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>new(rx: message::Rx<T>) -> <span class="self">Self </span>{ |
| ResponseFuture { |
| state: ResponseState::Rx { rx }, |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>failed(err: <span class="kw">crate</span>::BoxError) -> <span class="self">Self </span>{ |
| ResponseFuture { |
| state: ResponseState::Failed { error: <span class="prelude-val">Some</span>(err) }, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><F, T, E> Future <span class="kw">for </span>ResponseFuture<F> |
| <span class="kw">where |
| </span>F: Future<Output = <span class="prelude-ty">Result</span><T, E>>, |
| E: Into<<span class="kw">crate</span>::BoxError>, |
| { |
| <span class="kw">type </span>Output = <span class="prelude-ty">Result</span><T, <span class="kw">crate</span>::BoxError>; |
| |
| <span class="kw">fn </span>poll(<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="self">Self</span>::Output> { |
| <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="kw">match </span>this.state.as_mut().project() { |
| ResponseStateProj::Failed { error } => { |
| <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(error.take().expect(<span class="string">"polled after error"</span>))); |
| } |
| ResponseStateProj::Rx { rx } => <span class="kw">match </span><span class="macro">ready!</span>(rx.poll(cx)) { |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Ok</span>(fut)) => this.state.set(ResponseState::Poll { fut }), |
| <span class="prelude-val">Ok</span>(<span class="prelude-val">Err</span>(e)) => <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(e.into())), |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="kw">return </span>Poll::Ready(<span class="prelude-val">Err</span>(Closed::new().into())), |
| }, |
| ResponseStateProj::Poll { fut } => <span class="kw">return </span>fut.poll(cx).map_err(Into::into), |
| } |
| } |
| } |
| } |
| </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> |
