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</pre></div><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="attr">#[derive(Debug, Default)]
#[non_exhaustive]
</span><span class="kw">pub struct </span>RateLimiter;
<span class="kw">impl</span><S, B> Transform<S, ServiceRequest> <span class="kw">for </span>RateLimiter
<span class="kw">where
</span>S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error> + <span class="lifetime">'static</span>,
S::Future: <span class="lifetime">'static</span>,
B: <span class="lifetime">'static</span>,
{
<span class="kw">type </span>Response = ServiceResponse<EitherBody<B>>;
<span class="kw">type </span>Error = Error;
<span class="kw">type </span>Transform = RateLimiterMiddleware<S>;
<span class="kw">type </span>InitError = ();
<span class="kw">type </span>Future = Ready<<span class="prelude-ty">Result</span><<span class="self">Self</span>::Transform, <span class="self">Self</span>::InitError>>;
<span class="kw">fn </span>new_transform(<span class="kw-2">&</span><span class="self">self</span>, service: S) -> <span class="self">Self</span>::Future {
ok(RateLimiterMiddleware {
service: Rc::new(service),
})
}
}
<span class="doccomment">/// Rate limit middleware service.
</span><span class="attr">#[derive(Debug)]
</span><span class="kw">pub struct </span>RateLimiterMiddleware<S> {
service: Rc<S>,
}
<span class="kw">impl</span><S, B> Service<ServiceRequest> <span class="kw">for </span>RateLimiterMiddleware<S>
<span class="kw">where
</span>S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = Error> + <span class="lifetime">'static</span>,
S::Future: <span class="lifetime">'static</span>,
B: <span class="lifetime">'static</span>,
{
<span class="kw">type </span>Response = ServiceResponse<EitherBody<B>>;
<span class="kw">type </span>Error = Error;
<span class="kw">type </span>Future = Pin<Box<<span class="kw">dyn </span>Future<Output = <span class="prelude-ty">Result</span><<span class="self">Self</span>::Response, <span class="self">Self</span>::Error>>>>;
<span class="macro">forward_ready!</span>(service);
<span class="kw">fn </span>call(<span class="kw-2">&</span><span class="self">self</span>, req: ServiceRequest) -> <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::<web::Data<Limiter>>()
.expect(<span class="string">"web::Data<Limiter> should be set in app data for RateLimiter middleware"</span>)
.clone();
<span class="kw">let </span>key = (limiter.get_key_fn)(<span class="kw-2">&</span>req);
<span class="kw">let </span>service = Rc::clone(<span class="kw-2">&</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) => key,
<span class="prelude-val">None </span>=> {
<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>) => {
<span class="macro">log::warn!</span>(<span class="string">"Rate limit exceed error for {}"</span>, key);
<span class="prelude-val">Ok</span>(req.into_response(
HttpResponse::new(StatusCode::TOO_MANY_REQUESTS).map_into_right_body(),
))
}
LimitationError::Client(e) => {
<span class="macro">log::error!</span>(<span class="string">"Client request failed, redis error: {}"</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>=> {
<span class="macro">log::error!</span>(<span class="string">"Count failed: {}"</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></section></main></body></html>