| <!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/service_fn.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>service_fn.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>std::fmt; |
| <span class="kw">use </span>std::future::Future; |
| <span class="kw">use </span>std::task::{Context, Poll}; |
| <span class="kw">use </span>tower_service::Service; |
| |
| <span class="doccomment">/// Returns a new [`ServiceFn`] with the given closure. |
| /// |
| /// This lets you build a [`Service`] from an async function that returns a [`Result`]. |
| /// |
| /// # Example |
| /// |
| /// ``` |
| /// use tower::{service_fn, Service, ServiceExt, BoxError}; |
| /// # struct Request; |
| /// # impl Request { |
| /// # fn new() -> Self { Self } |
| /// # } |
| /// # struct Response(&'static str); |
| /// # impl Response { |
| /// # fn new(body: &'static str) -> Self { |
| /// # Self(body) |
| /// # } |
| /// # fn into_body(self) -> &'static str { self.0 } |
| /// # } |
| /// |
| /// # #[tokio::main] |
| /// # async fn main() -> Result<(), BoxError> { |
| /// async fn handle(request: Request) -> Result<Response, BoxError> { |
| /// let response = Response::new("Hello, World!"); |
| /// Ok(response) |
| /// } |
| /// |
| /// let mut service = service_fn(handle); |
| /// |
| /// let response = service |
| /// .ready() |
| /// .await? |
| /// .call(Request::new()) |
| /// .await?; |
| /// |
| /// assert_eq!("Hello, World!", response.into_body()); |
| /// # |
| /// # Ok(()) |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>service_fn<T>(f: T) -> ServiceFn<T> { |
| ServiceFn { f } |
| } |
| |
| <span class="doccomment">/// A [`Service`] implemented by a closure. |
| /// |
| /// See [`service_fn`] for more details. |
| </span><span class="attribute">#[derive(Copy, Clone)] |
| </span><span class="kw">pub struct </span>ServiceFn<T> { |
| f: T, |
| } |
| |
| <span class="kw">impl</span><T> fmt::Debug <span class="kw">for </span>ServiceFn<T> { |
| <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<<span class="lifetime">'_</span>>) -> fmt::Result { |
| f.debug_struct(<span class="string">"ServiceFn"</span>) |
| .field(<span class="string">"f"</span>, <span class="kw-2">&</span><span class="macro">format_args!</span>(<span class="string">"{}"</span>, std::any::type_name::<T>())) |
| .finish() |
| } |
| } |
| |
| <span class="kw">impl</span><T, F, Request, R, E> Service<Request> <span class="kw">for </span>ServiceFn<T> |
| <span class="kw">where |
| </span>T: FnMut(Request) -> F, |
| F: Future<Output = <span class="prelude-ty">Result</span><R, E>>, |
| { |
| <span class="kw">type </span>Response = R; |
| <span class="kw">type </span>Error = E; |
| <span class="kw">type </span>Future = F; |
| |
| <span class="kw">fn </span>poll_ready(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&mut </span>Context<<span class="lifetime">'_</span>>) -> Poll<<span class="prelude-ty">Result</span><(), E>> { |
| <span class="prelude-val">Ok</span>(()).into() |
| } |
| |
| <span class="kw">fn </span>call(<span class="kw-2">&mut </span><span class="self">self</span>, req: Request) -> <span class="self">Self</span>::Future { |
| (<span class="self">self</span>.f)(req) |
| } |
| } |
| </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> |
