| <!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/balance/p2c/make.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>make.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><span class="kw">super</span>::Balance; |
| <span class="kw">use </span><span class="kw">crate</span>::discover::Discover; |
| <span class="kw">use </span>futures_core::ready; |
| <span class="kw">use </span>pin_project_lite::pin_project; |
| <span class="kw">use </span>std::hash::Hash; |
| <span class="kw">use </span>std::marker::PhantomData; |
| <span class="kw">use </span>std::{ |
| fmt, |
| future::Future, |
| pin::Pin, |
| task::{Context, Poll}, |
| }; |
| <span class="kw">use </span>tower_service::Service; |
| |
| <span class="doccomment">/// Constructs load balancers over dynamic service sets produced by a wrapped "inner" service. |
| /// |
| /// This is effectively an implementation of [`MakeService`] except that it forwards the service |
| /// descriptors (`Target`) to an inner service (`S`), and expects that service to produce a |
| /// service set in the form of a [`Discover`]. It then wraps the service set in a [`Balance`] |
| /// before returning it as the "made" service. |
| /// |
| /// See the [module-level documentation](crate::balance) for details on load balancing. |
| /// |
| /// [`MakeService`]: crate::MakeService |
| /// [`Discover`]: crate::discover::Discover |
| /// [`Balance`]: crate::balance::p2c::Balance |
| </span><span class="kw">pub struct </span>MakeBalance<S, Req> { |
| inner: S, |
| _marker: PhantomData<<span class="kw">fn</span>(Req)>, |
| } |
| |
| <span class="macro">pin_project! </span>{ |
| <span class="doccomment">/// A [`Balance`] in the making. |
| /// |
| /// [`Balance`]: crate::balance::p2c::Balance |
| </span><span class="kw">pub struct </span>MakeFuture<F, Req> { |
| <span class="attribute">#[pin] |
| </span>inner: F, |
| _marker: PhantomData<<span class="kw">fn</span>(Req)>, |
| } |
| } |
| |
| <span class="kw">impl</span><S, Req> MakeBalance<S, Req> { |
| <span class="doccomment">/// Build balancers using operating system entropy. |
| </span><span class="kw">pub fn </span>new(make_discover: S) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| inner: make_discover, |
| _marker: PhantomData, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><S, Req> Clone <span class="kw">for </span>MakeBalance<S, Req> |
| <span class="kw">where |
| </span>S: Clone, |
| { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| <span class="self">Self </span>{ |
| inner: <span class="self">self</span>.inner.clone(), |
| _marker: PhantomData, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><S, Target, Req> Service<Target> <span class="kw">for </span>MakeBalance<S, Req> |
| <span class="kw">where |
| </span>S: Service<Target>, |
| S::Response: Discover, |
| <S::Response <span class="kw">as </span>Discover>::Key: Hash, |
| <S::Response <span class="kw">as </span>Discover>::Service: Service<Req>, |
| <<S::Response <span class="kw">as </span>Discover>::Service <span class="kw">as </span>Service<Req>>::Error: Into<<span class="kw">crate</span>::BoxError>, |
| { |
| <span class="kw">type </span>Response = Balance<S::Response, Req>; |
| <span class="kw">type </span>Error = S::Error; |
| <span class="kw">type </span>Future = MakeFuture<S::Future, Req>; |
| |
| <span class="kw">fn </span>poll_ready(<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="self">Self</span>::Error>> { |
| <span class="self">self</span>.inner.poll_ready(cx) |
| } |
| |
| <span class="kw">fn </span>call(<span class="kw-2">&mut </span><span class="self">self</span>, target: Target) -> <span class="self">Self</span>::Future { |
| MakeFuture { |
| inner: <span class="self">self</span>.inner.call(target), |
| _marker: PhantomData, |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><S, Req> fmt::Debug <span class="kw">for </span>MakeBalance<S, Req> |
| <span class="kw">where |
| </span>S: fmt::Debug, |
| { |
| <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="kw">let </span><span class="self">Self </span>{ inner, _marker } = <span class="self">self</span>; |
| f.debug_struct(<span class="string">"MakeBalance"</span>).field(<span class="string">"inner"</span>, inner).finish() |
| } |
| } |
| |
| <span class="kw">impl</span><F, T, E, Req> Future <span class="kw">for </span>MakeFuture<F, Req> |
| <span class="kw">where |
| </span>F: Future<Output = <span class="prelude-ty">Result</span><T, E>>, |
| T: Discover, |
| <T <span class="kw">as </span>Discover>::Key: Hash, |
| <T <span class="kw">as </span>Discover>::Service: Service<Req>, |
| <<T <span class="kw">as </span>Discover>::Service <span class="kw">as </span>Service<Req>>::Error: Into<<span class="kw">crate</span>::BoxError>, |
| { |
| <span class="kw">type </span>Output = <span class="prelude-ty">Result</span><Balance<T, Req>, E>; |
| |
| <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>this = <span class="self">self</span>.project(); |
| <span class="kw">let </span>inner = <span class="macro">ready!</span>(this.inner.poll(cx))<span class="question-mark">?</span>; |
| <span class="kw">let </span>svc = Balance::new(inner); |
| Poll::Ready(<span class="prelude-val">Ok</span>(svc)) |
| } |
| } |
| |
| <span class="kw">impl</span><F, Req> fmt::Debug <span class="kw">for </span>MakeFuture<F, Req> |
| <span class="kw">where |
| </span>F: fmt::Debug, |
| { |
| <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="kw">let </span><span class="self">Self </span>{ inner, _marker } = <span class="self">self</span>; |
| f.debug_struct(<span class="string">"MakeFuture"</span>).field(<span class="string">"inner"</span>, inner).finish() |
| } |
| } |
| </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> |
