tiered rate limiting
Signed-off-by: eternal-flame-AD <yume@yumechi.jp>
This commit is contained in:
parent
5f2cd3ade7
commit
4c98ae337b
6 changed files with 247 additions and 60 deletions
22
Cargo.lock
generated
22
Cargo.lock
generated
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@ -651,6 +651,12 @@ version = "1.0.7"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
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[[package]]
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name = "foldhash"
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version = "0.1.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f81ec6369c545a7d40e4589b5597581fa1c441fe1cce96dd1de43159910a36a2"
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[[package]]
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name = "fontconfig-parser"
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version = "0.5.7"
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@ -871,6 +877,11 @@ name = "hashbrown"
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version = "0.15.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3a9bfc1af68b1726ea47d3d5109de126281def866b33970e10fbab11b5dafab3"
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dependencies = [
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"allocator-api2",
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"equivalent",
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"foldhash",
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]
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[[package]]
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name = "heck"
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@ -1334,6 +1345,15 @@ dependencies = [
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"imgref",
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]
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[[package]]
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name = "lru"
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version = "0.12.5"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "234cf4f4a04dc1f57e24b96cc0cd600cf2af460d4161ac5ecdd0af8e1f3b2a38"
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dependencies = [
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"hashbrown 0.15.1",
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]
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[[package]]
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name = "matchit"
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version = "0.7.3"
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@ -3200,6 +3220,7 @@ dependencies = [
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"chumsky",
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"clap",
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"console_error_panic_hook",
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"dashmap",
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"env_logger",
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"fontdb",
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"futures",
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@ -3208,6 +3229,7 @@ dependencies = [
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"image",
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"libc",
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"log",
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"lru",
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"quote",
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"reqwest",
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"resvg",
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@ -81,6 +81,8 @@ fontdb = { version = "0.23", optional = true }
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webp = { version = "0.3.0", optional = true }
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url = { version = "2", optional = true }
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tower-http = { version = "0.6.2", features = ["catch-panic", "timeout"], optional = true }
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dashmap = "6.1.0"
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lru = "0.12.5"
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[patch.crates-io]
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# licensing and webp dependencies
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@ -16,6 +16,7 @@ Work in progress! Currently to do:
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- [X] Rate-limiting on local deployment (untested)
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- [X] Read config from Cloudflare
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- [X] Timing and Rate-limiting headers (some not available on Cloudflare Workers)
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- [X] Tiered rate-limiting
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- [ ] Lossy WebP on CF Workers
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- [ ] Cache Results on Cloudflare KV.
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- [ ] Handle all possible panics reported by Clippy
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18
local.toml
18
local.toml
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@ -2,6 +2,7 @@ listen = "127.0.0.1:3000"
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enable_cache = false
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index_redirect = { permanent = false, url = "https://mi.yumechi.jp/" }
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allow_unknown = false
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max_x_forwarded_for = 0
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# you need AppArmor and the policy loaded to use this
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[sandbox.apparmor]
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@ -19,7 +20,18 @@ enable_redirects = false
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normalization = "lazy"
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allow_svg_passthrough = false
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[rate_limit]
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max_x_forwarded_for = 0
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[[rate_limit]]
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replenish_every = 50
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burst = 256
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[[rate_limit]]
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key = "500ms"
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min_request_duration = 500
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replenish_every = 200
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burst = 64
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burst = 64
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[[rate_limit]]
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key = "1500ms"
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min_request_duration = 1500
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replenish_every = 1500
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burst = 16
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@ -37,9 +37,13 @@ pub struct Config {
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/// Post-processing configuration
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pub post_process: PostProcessConfig,
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#[cfg(not(feature = "cf-worker"))]
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/// The maximum number of X-Forwarded-For headers to allow
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pub max_x_forwarded_for: u8,
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#[cfg(feature = "governor")]
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/// Governor configuration
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pub rate_limit: RateLimitConfig,
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pub rate_limit: Vec<RateLimitConfig>,
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}
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/// Sandbox configuration
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@ -75,12 +79,15 @@ pub struct AppArmorConfig {
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#[cfg(feature = "governor")]
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#[derive(Debug, Clone, serde::Deserialize)]
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pub struct RateLimitConfig {
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/// The maximum number of X-Forwarded-For headers to allow
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pub max_x_forwarded_for: u8,
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/// The key to use for rate limiting headers
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pub key: Option<String>,
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/// The rate limit replenish interval in milliseconds
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pub replenish_every: u64,
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/// The rate limit burst size
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pub burst: NonZero<u32>,
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/// The minimum request duration in milliseconds for this rate limit to apply
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pub min_request_duration: Option<u64>,
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}
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#[cfg(feature = "cf-worker")]
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@ -130,12 +137,15 @@ impl Default for Config {
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normalization: NormalizationPolicy::Opportunistic,
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allow_svg_passthrough: false,
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},
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#[cfg(not(feature = "cf-worker"))]
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max_x_forwarded_for: 0,
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#[cfg(feature = "governor")]
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rate_limit: RateLimitConfig {
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max_x_forwarded_for: 0,
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rate_limit: vec![RateLimitConfig {
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key: None,
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replenish_every: 2000,
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burst: NonZero::new(32).unwrap(),
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},
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min_request_duration: None,
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}],
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}
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}
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}
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242
src/lib.rs
242
src/lib.rs
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@ -6,7 +6,12 @@
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#[cfg(feature = "governor")]
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use std::net::SocketAddr;
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use std::{borrow::Cow, fmt::Display, marker::PhantomData, sync::Arc};
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use std::{
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borrow::Cow,
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fmt::Display,
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marker::PhantomData,
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sync::{atomic::AtomicU64, Arc, RwLock},
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};
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#[cfg(feature = "governor")]
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use axum::extract::ConnectInfo;
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@ -24,6 +29,7 @@ use governor::{
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clock::SystemClock, middleware::StateInformationMiddleware, state::keyed::DashMapStateStore,
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RateLimiter,
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};
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use lru::LruCache;
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use post_process::{CompressionLevel, MediaResponse};
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use sandbox::Sandboxing;
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@ -110,18 +116,29 @@ where
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};
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#[cfg(feature = "governor")]
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use std::time::Duration;
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use std::{num::NonZero, sync::RwLock};
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#[cfg(not(feature = "cf-worker"))]
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use tower_http::{catch_panic::CatchPanicLayer, timeout::TimeoutLayer};
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let state = AppState {
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#[cfg(feature = "governor")]
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limiter: RateLimiter::dashmap_with_clock(
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Quota::with_period(Duration::from_millis(config.rate_limit.replenish_every))
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.unwrap()
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.allow_burst(config.rate_limit.burst),
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SystemClock,
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)
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.with_middleware::<StateInformationMiddleware>(),
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limiters: config
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.rate_limit
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.iter()
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.map(|x| {
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(
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RateLimiter::dashmap_with_clock(
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Quota::with_period(Duration::from_millis(x.replenish_every))
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.unwrap()
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.allow_burst(x.burst),
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SystemClock,
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)
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.with_middleware::<StateInformationMiddleware>(),
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RwLock::new(LruCache::new(NonZero::new(1024).unwrap())),
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)
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})
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.collect::<Vec<_>>()
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.into_boxed_slice(),
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client: Upstream::new(&config.fetch),
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sandbox: S::new(&config.sandbox),
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config,
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@ -178,6 +195,17 @@ where
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.layer(TimeoutLayer::new(Duration::from_secs(10)));
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}
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#[cfg(feature = "governor")]
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{
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let state_gc = Arc::clone(&state);
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std::thread::spawn(move || loop {
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std::thread::sleep(Duration::from_secs(300));
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for (limiter, _) in state_gc.limiters.iter() {
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limiter.retain_recent();
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}
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});
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}
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#[cfg(feature = "governor")]
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return router.route_layer(middleware::from_fn_with_state(state, rate_limit_middleware));
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#[cfg(not(feature = "governor"))]
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@ -232,6 +260,24 @@ pub async fn common_security_headers(
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resp
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}
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fn atomic_u64_saturating_dec(credits: &AtomicU64) -> bool {
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loop {
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let current = credits.load(std::sync::atomic::Ordering::Relaxed);
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if current == 0 {
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return false;
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}
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if credits.compare_exchange_weak(
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current,
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current - 1,
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std::sync::atomic::Ordering::Relaxed,
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std::sync::atomic::Ordering::Relaxed,
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) == Ok(current)
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{
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return true;
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}
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}
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}
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/// Middleware for rate limiting
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#[cfg(feature = "governor")]
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#[cfg_attr(feature = "cf-worker", worker::send)]
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@ -246,7 +292,9 @@ pub async fn rate_limit_middleware<S: Sandboxing + Send + Sync + 'static>(
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time::SystemTime,
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};
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let forwarded_ip = if state.config.rate_limit.max_x_forwarded_for > 0 {
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use axum::http::HeaderName;
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let forwarded_ip = if state.config.max_x_forwarded_for > 0 {
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std::iter::repeat(addr.ip())
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.chain(
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request
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@ -257,7 +305,7 @@ pub async fn rate_limit_middleware<S: Sandboxing + Send + Sync + 'static>(
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.split(',')
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.filter_map(|x| x.trim().parse().ok()),
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)
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.nth_back(state.config.rate_limit.max_x_forwarded_for as usize - 1)
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.nth_back(state.config.max_x_forwarded_for as usize - 1)
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.map(|addr| match addr {
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IpAddr::V6(addr) => IpAddr::V6(addr & Ipv6Addr::from_bits(!0u128 >> 64)),
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addr => addr,
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@ -266,30 +314,90 @@ pub async fn rate_limit_middleware<S: Sandboxing + Send + Sync + 'static>(
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None
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};
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match state.limiter.check_key(&forwarded_ip.unwrap_or(addr.ip())) {
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Ok(ok) => {
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let real_ip = forwarded_ip.unwrap_or_else(|| match addr.ip() {
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IpAddr::V6(addr) => IpAddr::V6(addr & Ipv6Addr::from_bits(!0u128 >> 64)),
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addr => addr,
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});
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let mut res = Vec::with_capacity(state.limiters.len());
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match state.limiters.iter().fold(Ok(()), |acc, limiter| {
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acc.and_then(|_| {
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// if we have credits, we don't need to check the key
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let credits = limiter.1.read().unwrap();
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if let Some(credits_val) = credits.peek(&forwarded_ip.unwrap_or(real_ip)) {
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if atomic_u64_saturating_dec(credits_val) {
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res.push(None);
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return Ok(());
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}
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drop(credits);
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let mut credits = limiter.1.write().unwrap();
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credits.pop(&forwarded_ip.unwrap_or(real_ip));
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}
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limiter
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.0
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.check_key(&forwarded_ip.unwrap_or(real_ip))
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.map(|x| res.push(Some(x)))
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})
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}) {
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Ok(_) => {
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let begin = SystemTime::now();
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let mut resp = next.run(request).await;
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let elapsed = begin.elapsed().unwrap().as_millis() as u64;
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// credit back limits that didn't get used
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for (config, (_, credits)) in state.config.rate_limit.iter().zip(state.limiters.iter())
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{
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if elapsed < config.min_request_duration.unwrap_or(0) {
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let mut credits = credits.write().unwrap();
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credits
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.get_or_insert(forwarded_ip.unwrap_or(real_ip), || 0.into())
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.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
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}
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}
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let headers = resp.headers_mut();
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headers.insert(
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"X-RateLimit-Limit",
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#[allow(clippy::unwrap_used)]
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ok.quota().burst_size().to_string().parse().unwrap(),
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);
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headers.insert(
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"X-RateLimit-Replenish-Interval",
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for (config, snapshot) in
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state
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.config
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.rate_limit
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.replenish_every
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.to_string()
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.parse()
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.unwrap(),
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);
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headers.insert(
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"X-RateLimit-Remaining",
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ok.remaining_burst_capacity().to_string().parse().unwrap(),
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);
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.iter()
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.zip(res.iter())
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.filter_map(|(config, snapshot)| match snapshot {
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Some(snapshot) => Some((config, snapshot)),
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None => None,
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})
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{
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let header_prefix = match config.key {
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Some(ref key) => format!("X-{}-RateLimit-", key),
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None => "X-RateLimit-".to_string(),
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};
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let (header_limit, header_interval, header_remaining) = (
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format!("{}Limit", header_prefix),
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format!("{}Replenish-Interval", header_prefix),
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format!("{}Remaining", header_prefix),
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);
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headers.insert(
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HeaderName::from_bytes(header_limit.as_bytes()).unwrap(),
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#[allow(clippy::unwrap_used)]
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snapshot.quota().burst_size().to_string().parse().unwrap(),
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);
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headers.insert(
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HeaderName::from_bytes(header_interval.as_bytes()).unwrap(),
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config.replenish_every.to_string().parse().unwrap(),
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);
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headers.insert("X-RateLimit-Remaining", "0".parse().unwrap());
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headers.insert(
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HeaderName::from_bytes(header_remaining.as_bytes()).unwrap(),
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snapshot
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.remaining_burst_capacity()
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.to_string()
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.parse()
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.unwrap(),
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);
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}
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resp
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}
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@ -298,29 +406,55 @@ pub async fn rate_limit_middleware<S: Sandboxing + Send + Sync + 'static>(
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let mut resp = ErrorResponse::rate_limit_exceeded().into_response();
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let headers = resp.headers_mut();
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headers.insert(
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"X-RateLimit-Limit",
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#[allow(clippy::unwrap_used)]
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err.quota().burst_size().to_string().parse().unwrap(),
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);
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headers.insert(
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"X-RateLimit-Replenish-Interval",
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for (config, snapshot) in
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state
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.config
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.rate_limit
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.replenish_every
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.to_string()
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.parse()
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.unwrap(),
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);
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headers.insert("X-RateLimit-Remaining", "0".parse().unwrap());
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.iter()
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.zip(res.iter())
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.filter_map(|(config, snapshot)| match snapshot {
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Some(snapshot) => Some((config, snapshot)),
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None => None,
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})
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{
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let header_prefix = match config.key {
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Some(ref key) => format!("X-{}-RateLimit-", key),
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None => "X-RateLimit-".to_string(),
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};
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let (header_limit, header_interval, header_remaining) = (
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format!("{}Limit", header_prefix),
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format!("{}Replenish-Interval", header_prefix),
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format!("{}Remaining", header_prefix),
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);
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headers.insert(
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HeaderName::from_bytes(header_limit.as_bytes()).unwrap(),
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#[allow(clippy::unwrap_used)]
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snapshot.quota().burst_size().to_string().parse().unwrap(),
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);
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headers.insert(
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HeaderName::from_bytes(header_interval.as_bytes()).unwrap(),
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config.replenish_every.to_string().parse().unwrap(),
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);
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headers.insert("X-RateLimit-Remaining", "0".parse().unwrap());
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headers.insert(
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HeaderName::from_bytes(header_remaining.as_bytes()).unwrap(),
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snapshot
|
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.remaining_burst_capacity()
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.to_string()
|
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.parse()
|
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.unwrap(),
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);
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}
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|
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headers.insert(
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"Retry-After",
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err.wait_time_from(SystemTime::now())
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err.earliest_possible()
|
||||
.duration_since(SystemTime::now())
|
||||
.unwrap()
|
||||
.as_secs()
|
||||
.to_string()
|
||||
.parse()
|
||||
.unwrap(),
|
||||
.into(),
|
||||
);
|
||||
|
||||
resp
|
||||
|
|
@ -464,7 +598,8 @@ impl std::error::Error for ErrorResponse {}
|
|||
impl ErrorResponse {
|
||||
#[cfg(not(feature = "cf-worker"))]
|
||||
/// URL must be a DNS name
|
||||
#[must_use] pub const fn non_dns_name() -> Self {
|
||||
#[must_use]
|
||||
pub const fn non_dns_name() -> Self {
|
||||
Self {
|
||||
status: StatusCode::BAD_REQUEST,
|
||||
message: Cow::Borrowed("URL must be a DNS name"),
|
||||
|
|
@ -657,11 +792,16 @@ impl IntoResponse for ErrorResponse {
|
|||
#[allow(unused)]
|
||||
pub struct AppState<C: UpstreamClient, S: Sandboxing> {
|
||||
#[cfg(feature = "governor")]
|
||||
limiter: RateLimiter<
|
||||
std::net::IpAddr,
|
||||
DashMapStateStore<std::net::IpAddr>,
|
||||
SystemClock,
|
||||
StateInformationMiddleware,
|
||||
limiters: Box<
|
||||
[(
|
||||
RateLimiter<
|
||||
std::net::IpAddr,
|
||||
DashMapStateStore<std::net::IpAddr>,
|
||||
SystemClock,
|
||||
StateInformationMiddleware,
|
||||
>,
|
||||
RwLock<LruCache<std::net::IpAddr, AtomicU64>>,
|
||||
)],
|
||||
>,
|
||||
config: Config,
|
||||
client: C,
|
||||
|
|
|
|||
Loading…
Reference in a new issue