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<!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 `actix-limitation/src/middleware.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>middleware.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="icon" href="https://actix.rs/favicon.ico"></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="mobile-topbar"><button class="sidebar-menu-toggle">&#9776;</button><a class="sidebar-logo" href="../../actix_limitation/index.html"><div class="logo-container"><img src="https://actix.rs/img/logo.png" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../actix_limitation/index.html"><div class="logo-container">
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<img src="https://actix.rs/img/logo.png" alt="logo"></a><nav class="sub"><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"><button type="button">?</button></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></div><section id="main-content" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1">1</span>
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</pre><pre class="rust"><code><span class="kw">use </span>std::{future::Future, pin::Pin, rc::Rc};
<span class="kw">use </span>actix_utils::future::{ok, Ready};
<span class="kw">use </span>actix_web::{
body::EitherBody,
dev::{forward_ready, Service, ServiceRequest, ServiceResponse, Transform},
http::StatusCode,
web, Error, HttpResponse,
};
<span class="kw">use crate</span>::{Error <span class="kw">as </span>LimitationError, Limiter};
<span class="doccomment">/// Rate limit middleware.
</span><span class="attribute">#[derive(Debug, Default)]
#[non_exhaustive]
</span><span class="kw">pub struct </span>RateLimiter;
<span class="kw">impl</span>&lt;S, B&gt; Transform&lt;S, ServiceRequest&gt; <span class="kw">for </span>RateLimiter
<span class="kw">where
</span>S: Service&lt;ServiceRequest, Response = ServiceResponse&lt;B&gt;, Error = Error&gt; + <span class="lifetime">&#39;static</span>,
S::Future: <span class="lifetime">&#39;static</span>,
B: <span class="lifetime">&#39;static</span>,
{
<span class="kw">type </span>Response = ServiceResponse&lt;EitherBody&lt;B&gt;&gt;;
<span class="kw">type </span>Error = Error;
<span class="kw">type </span>Transform = RateLimiterMiddleware&lt;S&gt;;
<span class="kw">type </span>InitError = ();
<span class="kw">type </span>Future = Ready&lt;<span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Transform, <span class="self">Self</span>::InitError&gt;&gt;;
<span class="kw">fn </span>new_transform(<span class="kw-2">&amp;</span><span class="self">self</span>, service: S) -&gt; <span class="self">Self</span>::Future {
ok(RateLimiterMiddleware {
service: Rc::new(service),
})
}
}
<span class="doccomment">/// Rate limit middleware service.
</span><span class="attribute">#[derive(Debug)]
</span><span class="kw">pub struct </span>RateLimiterMiddleware&lt;S&gt; {
service: Rc&lt;S&gt;,
}
<span class="kw">impl</span>&lt;S, B&gt; Service&lt;ServiceRequest&gt; <span class="kw">for </span>RateLimiterMiddleware&lt;S&gt;
<span class="kw">where
</span>S: Service&lt;ServiceRequest, Response = ServiceResponse&lt;B&gt;, Error = Error&gt; + <span class="lifetime">&#39;static</span>,
S::Future: <span class="lifetime">&#39;static</span>,
B: <span class="lifetime">&#39;static</span>,
{
<span class="kw">type </span>Response = ServiceResponse&lt;EitherBody&lt;B&gt;&gt;;
<span class="kw">type </span>Error = Error;
<span class="kw">type </span>Future = Pin&lt;Box&lt;<span class="kw">dyn </span>Future&lt;Output = <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>::Response, <span class="self">Self</span>::Error&gt;&gt;&gt;&gt;;
<span class="macro">forward_ready!</span>(service);
<span class="kw">fn </span>call(<span class="kw-2">&amp;</span><span class="self">self</span>, req: ServiceRequest) -&gt; <span class="self">Self</span>::Future {
<span class="comment">// A mis-configuration of the Actix App will result in a **runtime** failure, so the expect
// method description is important context for the developer.
</span><span class="kw">let </span>limiter = req
.app_data::&lt;web::Data&lt;Limiter&gt;&gt;()
.expect(<span class="string">&quot;web::Data&lt;Limiter&gt; should be set in app data for RateLimiter middleware&quot;</span>)
.clone();
<span class="kw">let </span>key = (limiter.get_key_fn)(<span class="kw-2">&amp;</span>req);
<span class="kw">let </span>service = Rc::clone(<span class="kw-2">&amp;</span><span class="self">self</span>.service);
<span class="kw">let </span>key = <span class="kw">match </span>key {
<span class="prelude-val">Some</span>(key) =&gt; key,
<span class="prelude-val">None </span>=&gt; {
<span class="kw">return </span>Box::pin(<span class="kw">async move </span>{
service
.call(req)
.<span class="kw">await
</span>.map(ServiceResponse::map_into_left_body)
});
}
};
Box::pin(<span class="kw">async move </span>{
<span class="kw">let </span>status = limiter.count(key.to_string()).<span class="kw">await</span>;
<span class="kw">if let </span><span class="prelude-val">Err</span>(err) = status {
<span class="kw">match </span>err {
LimitationError::LimitExceeded(<span class="kw">_</span>) =&gt; {
<span class="macro">log::warn!</span>(<span class="string">&quot;Rate limit exceed error for {}&quot;</span>, key);
<span class="prelude-val">Ok</span>(req.into_response(
HttpResponse::new(StatusCode::TOO_MANY_REQUESTS).map_into_right_body(),
))
}
LimitationError::Client(e) =&gt; {
<span class="macro">log::error!</span>(<span class="string">&quot;Client request failed, redis error: {}&quot;</span>, e);
<span class="prelude-val">Ok</span>(req.into_response(
HttpResponse::new(StatusCode::INTERNAL_SERVER_ERROR)
.map_into_right_body(),
))
}
<span class="kw">_ </span>=&gt; {
<span class="macro">log::error!</span>(<span class="string">&quot;Count failed: {}&quot;</span>, err);
<span class="prelude-val">Ok</span>(req.into_response(
HttpResponse::new(StatusCode::INTERNAL_SERVER_ERROR)
.map_into_right_body(),
))
}
}
} <span class="kw">else </span>{
service
.call(req)
.<span class="kw">await
</span>.map(ServiceResponse::map_into_left_body)
}
})
}
}
</code></pre></div>
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