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Rate limiter using a fixed window counter for arbitrary keys, backed by Redis for Actix Web. //! //! ```toml //! [dependencies] //! actix-web = "4" </span><span class="attr">#![doc = <span class="macro">concat!</span>(<span class="string">"actix-limitation = \""</span>, <span class="macro">env!</span>(<span class="string">"CARGO_PKG_VERSION_MAJOR"</span>), <span class="string">"."</span>, <span class="macro">env!</span>(<span class="string">"CARGO_PKG_VERSION_MINOR"</span>),<span class="string">"\""</span>)] </span><span class="doccomment">//! ``` //! //! ```no_run //! use std::{sync::Arc, time::Duration}; //! use actix_web::{dev::ServiceRequest, get, web, App, HttpServer, Responder}; //! use actix_session::SessionExt as _; //! use actix_limitation::{Limiter, RateLimiter}; //! //! #[get("/{id}/{name}")] //! async fn index(info: web::Path<(u32, String)>) -> impl Responder { //! format!("Hello {}! id:{}", info.1, info.0) //! } //! //! #[actix_web::main] //! async fn main() -> std::io::Result<()> { //! let limiter = web::Data::new( //! Limiter::builder("redis://127.0.0.1") //! .key_by(|req: &ServiceRequest| { //! req.get_session() //! .get(&"session-id") //! .unwrap_or_else(|_| req.cookie(&"rate-api-id").map(|c| c.to_string())) //! }) //! .limit(5000) //! .period(Duration::from_secs(3600)) // 60 minutes //! .build() //! .unwrap(), //! ); //! //! HttpServer::new(move || { //! App::new() //! .wrap(RateLimiter::default()) //! .app_data(limiter.clone()) //! .service(index) //! }) //! .bind(("127.0.0.1", 8080))? //! .run() //! .await //! } //! ``` </span><span class="attr">#![forbid(unsafe_code)] #![deny(rust_2018_idioms, nonstandard_style)] #![warn(future_incompatible, missing_docs, missing_debug_implementations)] #![doc(html_logo_url = <span class="string">"https://actix.rs/img/logo.png"</span>)] #![doc(html_favicon_url = <span class="string">"https://actix.rs/favicon.ico"</span>)] </span><span class="kw">use </span>std::{borrow::Cow, fmt, sync::Arc, time::Duration}; <span class="kw">use </span>actix_web::dev::ServiceRequest; <span class="kw">use </span>redis::Client; <span class="kw">mod </span>builder; <span class="kw">mod </span>errors; <span class="kw">mod </span>middleware; <span class="kw">mod </span>status; <span class="kw">pub use </span><span class="self">self</span>::{builder::Builder, errors::Error, middleware::RateLimiter, status::Status}; <span class="doccomment">/// Default request limit. </span><span class="kw">pub const </span>DEFAULT_REQUEST_LIMIT: usize = <span class="number">5000</span>; <span class="doccomment">/// Default period (in seconds). </span><span class="kw">pub const </span>DEFAULT_PERIOD_SECS: u64 = <span class="number">3600</span>; <span class="doccomment">/// Default cookie name. </span><span class="kw">pub const </span>DEFAULT_COOKIE_NAME: <span class="kw-2">&</span>str = <span class="string">"sid"</span>; <span class="doccomment">/// Default session key. </span><span class="attr">#[cfg(feature = <span class="string">"session"</span>)] </span><span class="kw">pub const </span>DEFAULT_SESSION_KEY: <span class="kw-2">&</span>str = <span class="string">"rate-api-id"</span>; <span class="doccomment">/// Helper trait to impl Debug on GetKeyFn type </span><span class="kw">trait </span>GetKeyFnT: Fn(<span class="kw-2">&</span>ServiceRequest) -> <span class="prelude-ty">Option</span><String> {} <span class="kw">impl</span><T> GetKeyFnT <span class="kw">for </span>T <span class="kw">where </span>T: Fn(<span class="kw-2">&</span>ServiceRequest) -> <span class="prelude-ty">Option</span><String> {} <span class="doccomment">/// Get key function type with auto traits </span><span class="kw">type </span>GetKeyFn = <span class="kw">dyn </span>GetKeyFnT + Send + Sync; <span class="doccomment">/// Get key resolver function type </span><span class="kw">impl </span>fmt::Debug <span class="kw">for </span>GetKeyFn { <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 { <span class="macro">write!</span>(f, <span class="string">"GetKeyFn"</span>) } } <span class="doccomment">/// Wrapped Get key function Trait </span><span class="kw">type </span>GetArcBoxKeyFn = Arc<GetKeyFn>; <span class="doccomment">/// Rate limiter. </span><span class="attr">#[derive(Debug, Clone)] </span><span class="kw">pub struct </span>Limiter { client: Client, limit: usize, period: Duration, get_key_fn: GetArcBoxKeyFn, } <span class="kw">impl </span>Limiter { <span class="doccomment">/// Construct rate limiter builder with defaults. /// /// See [`redis-rs` docs](https://docs.rs/redis/0.21/redis/#connection-parameters) on connection /// parameters for how to set the Redis URL. </span><span class="attr">#[must_use] </span><span class="kw">pub fn </span>builder(redis_url: <span class="kw">impl </span>Into<String>) -> Builder { Builder { redis_url: redis_url.into(), limit: DEFAULT_REQUEST_LIMIT, period: Duration::from_secs(DEFAULT_PERIOD_SECS), get_key_fn: <span class="prelude-val">None</span>, cookie_name: Cow::Borrowed(DEFAULT_COOKIE_NAME), <span class="attr">#[cfg(feature = <span class="string">"session"</span>)] </span>session_key: Cow::Borrowed(DEFAULT_SESSION_KEY), } } <span class="doccomment">/// Consumes one rate limit unit, returning the status. </span><span class="kw">pub async fn </span>count(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw">impl </span>Into<String>) -> <span class="prelude-ty">Result</span><Status, Error> { <span class="kw">let </span>(count, reset) = <span class="self">self</span>.track(key).<span class="kw">await</span><span class="question-mark">?</span>; <span class="kw">let </span>status = Status::new(count, <span class="self">self</span>.limit, reset); <span class="kw">if </span>count > <span class="self">self</span>.limit { <span class="prelude-val">Err</span>(Error::LimitExceeded(status)) } <span class="kw">else </span>{ <span class="prelude-val">Ok</span>(status) } } <span class="doccomment">/// Tracks the given key in a period and returns the count and TTL for the key in seconds. </span><span class="kw">async fn </span>track(<span class="kw-2">&</span><span class="self">self</span>, key: <span class="kw">impl </span>Into<String>) -> <span class="prelude-ty">Result</span><(usize, usize), Error> { <span class="kw">let </span>key = key.into(); <span class="kw">let </span>expires = <span class="self">self</span>.period.as_secs(); <span class="kw">let </span><span class="kw-2">mut </span>connection = <span class="self">self</span>.client.get_tokio_connection().<span class="kw">await</span><span class="question-mark">?</span>; <span class="comment">// The seed of this approach is outlined Atul R in a blog post about rate limiting using // NodeJS and Redis. For more details, see https://blog.atulr.com/rate-limiter </span><span class="kw">let </span><span class="kw-2">mut </span>pipe = redis::pipe(); pipe.atomic() .cmd(<span class="string">"SET"</span>) <span class="comment">// Set key and value </span>.arg(<span class="kw-2">&</span>key) .arg(<span class="number">0</span>) .arg(<span class="string">"EX"</span>) <span class="comment">// Set the specified expire time, in seconds. </span>.arg(expires) .arg(<span class="string">"NX"</span>) <span class="comment">// Only set the key if it does not already exist. </span>.ignore() <span class="comment">// --- ignore returned value of SET command --- </span>.cmd(<span class="string">"INCR"</span>) <span class="comment">// Increment key </span>.arg(<span class="kw-2">&</span>key) .cmd(<span class="string">"TTL"</span>) <span class="comment">// Return time-to-live of key </span>.arg(<span class="kw-2">&</span>key); <span class="kw">let </span>(count, ttl) = pipe.query_async(<span class="kw-2">&mut </span>connection).<span class="kw">await</span><span class="question-mark">?</span>; <span class="kw">let </span>reset = Status::epoch_utc_plus(Duration::from_secs(ttl))<span class="question-mark">?</span>; <span class="prelude-val">Ok</span>((count, reset)) } } <span class="attr">#[cfg(test)] </span><span class="kw">mod </span>tests { <span class="kw">use super</span>::<span class="kw-2">*</span>; <span class="attr">#[test] </span><span class="kw">fn </span>test_create_limiter() { <span class="kw">let </span><span class="kw-2">mut </span>builder = Limiter::builder(<span class="string">"redis://127.0.0.1:6379/1"</span>); <span class="kw">let </span>limiter = builder.build(); <span class="macro">assert!</span>(limiter.is_ok()); <span class="kw">let </span>limiter = limiter.unwrap(); <span class="macro">assert_eq!</span>(limiter.limit, <span class="number">5000</span>); <span class="macro">assert_eq!</span>(limiter.period, Duration::from_secs(<span class="number">3600</span>)); } } </code></pre></div></section></main></body></html>