Refactor rate limiter and improve rate limit bucket cleanup (#3937)
* Update rate_limiter.rs * Update mod.rs * Update rate_limiter.rs * Update rate_limiter.rs * Update mod.rs * Update scheduled_tasks.rs * Shrink `RateLimitBucket` * Update rate_limiter.rs * Update mod.rs * Update rate_limiter.rs * Update rate_limiter.rs * Update rate_limiter.rs * Update rate_limiter.rs * Update mod.rs * Update rate_limiter.rs * fmt * Update rate_limiter.rs * Update rate_limiter.rs * Update rate_limiter.rs * Update rate_limiter.rs * Update rate_limiter.rs * Update rate_limiter.rs * Update rate_limiter.rs * Update rate_limiter.rs * Update rate_limiter.rs * rerun ci * Update rate_limiter.rs * Undo changes to fields * Manually undo changes to RateLimitBucket fields * fmt * Bucket cleanup loop in rate_limit/mod.rs * Remove rate limit bucket cleanup from scheduled_tasks.rs * Remove ; * Remove UNINITIALIZED_TOKEN_AMOUNT * Update rate_limiter.rs * fmt * Update rate_limiter.rs * fmt * Update rate_limiter.rs * fmt * Update rate_limiter.rs * stuff * MapLevel trait * fix merge * Prevent negative numbers in buckets * Clean up MapLevel::check * MapLevel::remove_full_buckets * stuff * Use remove_full_buckets to avoid allocations * stuff * remove tx * Remove RateLimitConfig * Rename settings_updated_channel to rate_limit_cell * Remove global rate limit cell * impl Default for RateLimitCell * bucket_configs doc comment to explain EnumMap * improve test_rate_limiter * rename default to with_test_config --------- Co-authored-by: Dessalines <dessalines@users.noreply.github.com> Co-authored-by: Nutomic <me@nutomic.com>
This commit is contained in:
dullbananas
GitHub
parent
a675fecacd
commit
a14657d124
15 changed files with 388 additions and 395 deletions
1
Cargo.lock
generated
1
Cargo.lock
generated
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@ -2659,6 +2659,7 @@ dependencies = [
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"anyhow",
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"chrono",
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"encoding",
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"enum-map",
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"futures",
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"getrandom",
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"jsonwebtoken",
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@ -129,6 +129,7 @@ rustls = { version = "0.21.3", features = ["dangerous_configuration"] }
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futures-util = "0.3.28"
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tokio-postgres = "0.7.8"
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tokio-postgres-rustls = "0.10.0"
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enum-map = "2.6"
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[dependencies]
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lemmy_api = { workspace = true }
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@ -68,6 +68,7 @@ actix-web = { workspace = true, optional = true }
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jsonwebtoken = { version = "8.3.0", optional = true }
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# necessary for wasmt compilation
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getrandom = { version = "0.2.10", features = ["js"] }
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enum-map = { workspace = true }
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[dev-dependencies]
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serial_test = { workspace = true }
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@ -88,7 +88,7 @@ mod tests {
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traits::Crud,
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utils::build_db_pool_for_tests,
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};
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use lemmy_utils::rate_limit::{RateLimitCell, RateLimitConfig};
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use lemmy_utils::rate_limit::RateLimitCell;
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use reqwest::Client;
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use reqwest_middleware::ClientBuilder;
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use serial_test::serial;
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@ -103,9 +103,7 @@ mod tests {
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pool_.clone(),
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ClientBuilder::new(Client::default()).build(),
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secret,
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RateLimitCell::new(RateLimitConfig::builder().build())
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.await
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.clone(),
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RateLimitCell::with_test_config(),
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);
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let inserted_instance = Instance::read_or_create(pool, "my_domain.tld".to_string())
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@ -46,7 +46,7 @@ impl LemmyContext {
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pub fn secret(&self) -> &Secret {
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&self.secret
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}
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pub fn settings_updated_channel(&self) -> &RateLimitCell {
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pub fn rate_limit_cell(&self) -> &RateLimitCell {
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&self.rate_limit_cell
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}
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}
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@ -7,6 +7,7 @@ use crate::{
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use actix_web::cookie::{Cookie, SameSite};
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use anyhow::Context;
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use chrono::{DateTime, Days, Local, TimeZone, Utc};
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use enum_map::{enum_map, EnumMap};
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use lemmy_db_schema::{
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newtypes::{CommunityId, DbUrl, PersonId, PostId},
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source::{
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@ -34,7 +35,7 @@ use lemmy_utils::{
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email::{send_email, translations::Lang},
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error::{LemmyError, LemmyErrorExt, LemmyErrorType, LemmyResult},
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location_info,
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rate_limit::RateLimitConfig,
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rate_limit::{ActionType, BucketConfig},
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settings::structs::Settings,
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utils::slurs::build_slur_regex,
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};
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@ -390,25 +391,21 @@ fn lang_str_to_lang(lang: &str) -> Lang {
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}
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pub fn local_site_rate_limit_to_rate_limit_config(
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local_site_rate_limit: &LocalSiteRateLimit,
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) -> RateLimitConfig {
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let l = local_site_rate_limit;
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RateLimitConfig {
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message: l.message,
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message_per_second: l.message_per_second,
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post: l.post,
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post_per_second: l.post_per_second,
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register: l.register,
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register_per_second: l.register_per_second,
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image: l.image,
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image_per_second: l.image_per_second,
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comment: l.comment,
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comment_per_second: l.comment_per_second,
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search: l.search,
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search_per_second: l.search_per_second,
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import_user_settings: l.import_user_settings,
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import_user_settings_per_second: l.import_user_settings_per_second,
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l: &LocalSiteRateLimit,
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) -> EnumMap<ActionType, BucketConfig> {
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enum_map! {
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ActionType::Message => (l.message, l.message_per_second),
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ActionType::Post => (l.post, l.post_per_second),
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ActionType::Register => (l.register, l.register_per_second),
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ActionType::Image => (l.image, l.image_per_second),
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ActionType::Comment => (l.comment, l.comment_per_second),
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ActionType::Search => (l.search, l.search_per_second),
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ActionType::ImportUserSettings => (l.import_user_settings, l.import_user_settings_per_second),
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}
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.map(|_key, (capacity, secs_to_refill)| BucketConfig {
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capacity: u32::try_from(capacity).unwrap_or(0),
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secs_to_refill: u32::try_from(secs_to_refill).unwrap_or(0),
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})
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}
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pub fn local_site_to_slur_regex(local_site: &LocalSite) -> Option<Regex> {
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@ -119,10 +119,7 @@ pub async fn create_site(
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let rate_limit_config =
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local_site_rate_limit_to_rate_limit_config(&site_view.local_site_rate_limit);
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context
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.settings_updated_channel()
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.send(rate_limit_config)
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.await?;
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context.rate_limit_cell().set_config(rate_limit_config);
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Ok(Json(SiteResponse {
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site_view,
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@ -157,10 +157,7 @@ pub async fn update_site(
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let rate_limit_config =
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local_site_rate_limit_to_rate_limit_config(&site_view.local_site_rate_limit);
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context
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.settings_updated_channel()
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.send(rate_limit_config)
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.await?;
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context.rate_limit_cell().set_config(rate_limit_config);
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Ok(Json(SiteResponse {
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site_view,
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@ -61,10 +61,7 @@ pub(crate) mod tests {
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use anyhow::anyhow;
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use lemmy_api_common::{context::LemmyContext, request::build_user_agent};
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use lemmy_db_schema::{source::secret::Secret, utils::build_db_pool_for_tests};
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use lemmy_utils::{
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rate_limit::{RateLimitCell, RateLimitConfig},
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settings::SETTINGS,
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};
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use lemmy_utils::{rate_limit::RateLimitCell, settings::SETTINGS};
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use reqwest::{Client, Request, Response};
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use reqwest_middleware::{ClientBuilder, Middleware, Next};
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use task_local_extensions::Extensions;
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@ -101,8 +98,7 @@ pub(crate) mod tests {
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jwt_secret: String::new(),
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};
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let rate_limit_config = RateLimitConfig::builder().build();
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let rate_limit_cell = RateLimitCell::new(rate_limit_config).await;
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let rate_limit_cell = RateLimitCell::with_test_config();
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let context = LemmyContext::create(pool, client, secret, rate_limit_cell.clone());
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let config = FederationConfig::builder()
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@ -47,7 +47,7 @@ smart-default = "0.7.1"
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lettre = { version = "0.10.4", features = ["tokio1", "tokio1-native-tls"] }
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markdown-it = "0.5.1"
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ts-rs = { workspace = true, optional = true }
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enum-map = "2.6"
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enum-map = { workspace = true }
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[dev-dependencies]
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reqwest = { workspace = true }
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@ -1,9 +1,9 @@
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use crate::error::{LemmyError, LemmyErrorType};
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use actix_web::dev::{ConnectionInfo, Service, ServiceRequest, ServiceResponse, Transform};
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use enum_map::enum_map;
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use enum_map::{enum_map, EnumMap};
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use futures::future::{ok, Ready};
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use rate_limiter::{InstantSecs, RateLimitStorage, RateLimitType};
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use serde::{Deserialize, Serialize};
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pub use rate_limiter::{ActionType, BucketConfig};
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use rate_limiter::{InstantSecs, RateLimitState};
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use std::{
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future::Future,
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net::{IpAddr, Ipv4Addr, SocketAddr},
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@ -14,208 +14,140 @@ use std::{
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task::{Context, Poll},
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time::Duration,
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};
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use tokio::sync::{mpsc, mpsc::Sender, OnceCell};
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use typed_builder::TypedBuilder;
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pub mod rate_limiter;
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#[derive(Debug, Deserialize, Serialize, Clone, TypedBuilder)]
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pub struct RateLimitConfig {
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#[builder(default = 180)]
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/// Maximum number of messages created in interval
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pub message: i32,
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#[builder(default = 60)]
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/// Interval length for message limit, in seconds
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pub message_per_second: i32,
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#[builder(default = 6)]
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/// Maximum number of posts created in interval
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pub post: i32,
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#[builder(default = 300)]
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/// Interval length for post limit, in seconds
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pub post_per_second: i32,
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#[builder(default = 3)]
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/// Maximum number of registrations in interval
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pub register: i32,
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#[builder(default = 3600)]
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/// Interval length for registration limit, in seconds
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pub register_per_second: i32,
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#[builder(default = 6)]
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/// Maximum number of image uploads in interval
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pub image: i32,
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#[builder(default = 3600)]
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/// Interval length for image uploads, in seconds
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pub image_per_second: i32,
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#[builder(default = 6)]
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/// Maximum number of comments created in interval
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pub comment: i32,
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#[builder(default = 600)]
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/// Interval length for comment limit, in seconds
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pub comment_per_second: i32,
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#[builder(default = 60)]
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/// Maximum number of searches created in interval
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pub search: i32,
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#[builder(default = 600)]
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/// Interval length for search limit, in seconds
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pub search_per_second: i32,
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#[builder(default = 1)]
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/// Maximum number of user settings imports in interval
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pub import_user_settings: i32,
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#[builder(default = 24 * 60 * 60)]
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/// Interval length for importing user settings, in seconds (defaults to 24 hours)
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pub import_user_settings_per_second: i32,
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}
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#[derive(Debug, Clone)]
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struct RateLimit {
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pub rate_limiter: RateLimitStorage,
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pub rate_limit_config: RateLimitConfig,
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}
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#[derive(Debug, Clone)]
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pub struct RateLimitedGuard {
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rate_limit: Arc<Mutex<RateLimit>>,
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type_: RateLimitType,
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pub struct RateLimitChecker {
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state: Arc<Mutex<RateLimitState>>,
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action_type: ActionType,
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}
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/// Single instance of rate limit config and buckets, which is shared across all threads.
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#[derive(Clone)]
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pub struct RateLimitCell {
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tx: Sender<RateLimitConfig>,
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rate_limit: Arc<Mutex<RateLimit>>,
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state: Arc<Mutex<RateLimitState>>,
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}
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impl RateLimitCell {
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/// Initialize cell if it wasnt initialized yet. Otherwise returns the existing cell.
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pub async fn new(rate_limit_config: RateLimitConfig) -> &'static Self {
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static LOCAL_INSTANCE: OnceCell<RateLimitCell> = OnceCell::const_new();
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LOCAL_INSTANCE
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.get_or_init(|| async {
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let (tx, mut rx) = mpsc::channel::<RateLimitConfig>(4);
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let rate_limit = Arc::new(Mutex::new(RateLimit {
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rate_limiter: Default::default(),
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rate_limit_config,
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}));
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let rate_limit2 = rate_limit.clone();
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pub fn new(rate_limit_config: EnumMap<ActionType, BucketConfig>) -> Self {
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let state = Arc::new(Mutex::new(RateLimitState::new(rate_limit_config)));
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let state_weak_ref = Arc::downgrade(&state);
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tokio::spawn(async move {
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while let Some(r) = rx.recv().await {
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rate_limit2
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let hour = Duration::from_secs(3600);
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// This loop stops when all other references to `state` are dropped
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while let Some(state) = state_weak_ref.upgrade() {
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tokio::time::sleep(hour).await;
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state
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.lock()
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.expect("Failed to lock rate limit mutex for updating")
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.rate_limit_config = r;
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.expect("Failed to lock rate limit mutex for reading")
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.remove_full_buckets(InstantSecs::now());
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}
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});
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RateLimitCell { tx, rate_limit }
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})
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.await
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RateLimitCell { state }
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}
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/// Call this when the config was updated, to update all in-memory cells.
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pub async fn send(&self, config: RateLimitConfig) -> Result<(), LemmyError> {
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self.tx.send(config).await?;
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Ok(())
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}
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/// Remove buckets older than the given duration
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pub fn remove_older_than(&self, mut duration: Duration) {
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let mut guard = self
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.rate_limit
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pub fn set_config(&self, config: EnumMap<ActionType, BucketConfig>) {
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self
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.state
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.lock()
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.expect("Failed to lock rate limit mutex for reading");
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let rate_limit = &guard.rate_limit_config;
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// If any rate limit interval is greater than `duration`, then the largest interval is used instead. This preserves buckets that would not pass the rate limit check.
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let max_interval_secs = enum_map! {
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RateLimitType::Message => rate_limit.message_per_second,
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RateLimitType::Post => rate_limit.post_per_second,
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RateLimitType::Register => rate_limit.register_per_second,
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RateLimitType::Image => rate_limit.image_per_second,
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RateLimitType::Comment => rate_limit.comment_per_second,
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RateLimitType::Search => rate_limit.search_per_second,
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RateLimitType::ImportUserSettings => rate_limit.import_user_settings_per_second
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}
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.into_values()
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.max()
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.and_then(|max| u64::try_from(max).ok())
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.unwrap_or(0);
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duration = std::cmp::max(duration, Duration::from_secs(max_interval_secs));
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guard
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.rate_limiter
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.remove_older_than(duration, InstantSecs::now())
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.expect("Failed to lock rate limit mutex for updating")
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.set_config(config);
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}
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pub fn message(&self) -> RateLimitedGuard {
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self.kind(RateLimitType::Message)
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pub fn message(&self) -> RateLimitChecker {
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self.new_checker(ActionType::Message)
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}
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pub fn post(&self) -> RateLimitedGuard {
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self.kind(RateLimitType::Post)
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pub fn post(&self) -> RateLimitChecker {
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self.new_checker(ActionType::Post)
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}
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pub fn register(&self) -> RateLimitedGuard {
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self.kind(RateLimitType::Register)
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pub fn register(&self) -> RateLimitChecker {
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self.new_checker(ActionType::Register)
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}
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pub fn image(&self) -> RateLimitedGuard {
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self.kind(RateLimitType::Image)
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pub fn image(&self) -> RateLimitChecker {
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self.new_checker(ActionType::Image)
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}
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pub fn comment(&self) -> RateLimitedGuard {
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self.kind(RateLimitType::Comment)
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pub fn comment(&self) -> RateLimitChecker {
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self.new_checker(ActionType::Comment)
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}
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pub fn search(&self) -> RateLimitedGuard {
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self.kind(RateLimitType::Search)
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pub fn search(&self) -> RateLimitChecker {
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self.new_checker(ActionType::Search)
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}
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pub fn import_user_settings(&self) -> RateLimitedGuard {
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self.kind(RateLimitType::ImportUserSettings)
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pub fn import_user_settings(&self) -> RateLimitChecker {
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self.new_checker(ActionType::ImportUserSettings)
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}
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fn kind(&self, type_: RateLimitType) -> RateLimitedGuard {
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RateLimitedGuard {
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rate_limit: self.rate_limit.clone(),
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type_,
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fn new_checker(&self, action_type: ActionType) -> RateLimitChecker {
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RateLimitChecker {
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state: self.state.clone(),
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action_type,
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}
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}
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pub fn with_test_config() -> Self {
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Self::new(enum_map! {
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ActionType::Message => BucketConfig {
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capacity: 180,
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secs_to_refill: 60,
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},
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ActionType::Post => BucketConfig {
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capacity: 6,
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secs_to_refill: 300,
|
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},
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ActionType::Register => BucketConfig {
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capacity: 3,
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secs_to_refill: 3600,
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},
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ActionType::Image => BucketConfig {
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capacity: 6,
|
||||
secs_to_refill: 3600,
|
||||
},
|
||||
ActionType::Comment => BucketConfig {
|
||||
capacity: 6,
|
||||
secs_to_refill: 600,
|
||||
},
|
||||
ActionType::Search => BucketConfig {
|
||||
capacity: 60,
|
||||
secs_to_refill: 600,
|
||||
},
|
||||
ActionType::ImportUserSettings => BucketConfig {
|
||||
capacity: 1,
|
||||
secs_to_refill: 24 * 60 * 60,
|
||||
},
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
pub struct RateLimitedMiddleware<S> {
|
||||
rate_limited: RateLimitedGuard,
|
||||
checker: RateLimitChecker,
|
||||
service: Rc<S>,
|
||||
}
|
||||
|
||||
impl RateLimitedGuard {
|
||||
impl RateLimitChecker {
|
||||
/// Returns true if the request passed the rate limit, false if it failed and should be rejected.
|
||||
pub fn check(self, ip_addr: IpAddr) -> bool {
|
||||
// Does not need to be blocking because the RwLock in settings never held across await points,
|
||||
// and the operation here locks only long enough to clone
|
||||
let mut guard = self
|
||||
.rate_limit
|
||||
let mut state = self
|
||||
.state
|
||||
.lock()
|
||||
.expect("Failed to lock rate limit mutex for reading");
|
||||
let rate_limit = &guard.rate_limit_config;
|
||||
|
||||
let (kind, interval) = match self.type_ {
|
||||
RateLimitType::Message => (rate_limit.message, rate_limit.message_per_second),
|
||||
RateLimitType::Post => (rate_limit.post, rate_limit.post_per_second),
|
||||
RateLimitType::Register => (rate_limit.register, rate_limit.register_per_second),
|
||||
RateLimitType::Image => (rate_limit.image, rate_limit.image_per_second),
|
||||
RateLimitType::Comment => (rate_limit.comment, rate_limit.comment_per_second),
|
||||
RateLimitType::Search => (rate_limit.search, rate_limit.search_per_second),
|
||||
RateLimitType::ImportUserSettings => (
|
||||
rate_limit.import_user_settings,
|
||||
rate_limit.import_user_settings_per_second,
|
||||
),
|
||||
};
|
||||
let limiter = &mut guard.rate_limiter;
|
||||
|
||||
limiter.check_rate_limit_full(self.type_, ip_addr, kind, interval, InstantSecs::now())
|
||||
state.check(self.action_type, ip_addr, InstantSecs::now())
|
||||
}
|
||||
}
|
||||
|
||||
impl<S> Transform<S, ServiceRequest> for RateLimitedGuard
|
||||
impl<S> Transform<S, ServiceRequest> for RateLimitChecker
|
||||
where
|
||||
S: Service<ServiceRequest, Response = ServiceResponse, Error = actix_web::Error> + 'static,
|
||||
S::Future: 'static,
|
||||
|
|
@ -228,7 +160,7 @@ where
|
|||
|
||||
fn new_transform(&self, service: S) -> Self::Future {
|
||||
ok(RateLimitedMiddleware {
|
||||
rate_limited: self.clone(),
|
||||
checker: self.clone(),
|
||||
service: Rc::new(service),
|
||||
})
|
||||
}
|
||||
|
|
@ -252,11 +184,11 @@ where
|
|||
fn call(&self, req: ServiceRequest) -> Self::Future {
|
||||
let ip_addr = get_ip(&req.connection_info());
|
||||
|
||||
let rate_limited = self.rate_limited.clone();
|
||||
let checker = self.checker.clone();
|
||||
let service = self.service.clone();
|
||||
|
||||
Box::pin(async move {
|
||||
if rate_limited.check(ip_addr) {
|
||||
if checker.check(ip_addr) {
|
||||
service.call(req).await
|
||||
} else {
|
||||
let (http_req, _) = req.into_parts();
|
||||
|
|
|
|||
|
|
@ -1,15 +1,13 @@
|
|||
use enum_map::{enum_map, EnumMap};
|
||||
use enum_map::EnumMap;
|
||||
use once_cell::sync::Lazy;
|
||||
use std::{
|
||||
collections::HashMap,
|
||||
hash::Hash,
|
||||
net::{IpAddr, Ipv4Addr, Ipv6Addr},
|
||||
time::{Duration, Instant},
|
||||
time::Instant,
|
||||
};
|
||||
use tracing::debug;
|
||||
|
||||
const UNINITIALIZED_TOKEN_AMOUNT: f32 = -2.0;
|
||||
|
||||
static START_TIME: Lazy<Instant> = Lazy::new(Instant::now);
|
||||
|
||||
/// Smaller than `std::time::Instant` because it uses a smaller integer for seconds and doesn't
|
||||
|
|
@ -26,27 +24,48 @@ impl InstantSecs {
|
|||
.expect("server has been running for over 136 years"),
|
||||
}
|
||||
}
|
||||
|
||||
fn secs_since(self, earlier: Self) -> u32 {
|
||||
self.secs.saturating_sub(earlier.secs)
|
||||
}
|
||||
|
||||
fn to_instant(self) -> Instant {
|
||||
*START_TIME + Duration::from_secs(self.secs.into())
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(PartialEq, Debug, Clone)]
|
||||
struct RateLimitBucket {
|
||||
#[derive(PartialEq, Debug, Clone, Copy)]
|
||||
struct Bucket {
|
||||
last_checked: InstantSecs,
|
||||
/// This field stores the amount of tokens that were present at `last_checked`.
|
||||
/// The amount of tokens steadily increases until it reaches the bucket's capacity.
|
||||
/// Performing the rate-limited action consumes 1 token.
|
||||
tokens: f32,
|
||||
tokens: u32,
|
||||
}
|
||||
|
||||
#[derive(PartialEq, Debug, Copy, Clone)]
|
||||
pub struct BucketConfig {
|
||||
pub capacity: u32,
|
||||
pub secs_to_refill: u32,
|
||||
}
|
||||
|
||||
impl Bucket {
|
||||
fn update(self, now: InstantSecs, config: BucketConfig) -> Self {
|
||||
let secs_since_last_checked = now.secs.saturating_sub(self.last_checked.secs);
|
||||
|
||||
// For `secs_since_last_checked` seconds, the amount of tokens increases by `capacity` every `secs_to_refill` seconds.
|
||||
// The amount of tokens added per second is `capacity / secs_to_refill`.
|
||||
// The expression below is like `secs_since_last_checked * (capacity / secs_to_refill)` but with precision and non-overflowing multiplication.
|
||||
let added_tokens = u64::from(secs_since_last_checked) * u64::from(config.capacity)
|
||||
/ u64::from(config.secs_to_refill);
|
||||
|
||||
// The amount of tokens there would be if the bucket had infinite capacity
|
||||
let unbounded_tokens = self.tokens + (added_tokens as u32);
|
||||
|
||||
// Bucket stops filling when capacity is reached
|
||||
let tokens = std::cmp::min(unbounded_tokens, config.capacity);
|
||||
|
||||
Bucket {
|
||||
last_checked: now,
|
||||
tokens,
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug, enum_map::Enum, Copy, Clone, AsRefStr)]
|
||||
pub(crate) enum RateLimitType {
|
||||
pub enum ActionType {
|
||||
Message,
|
||||
Register,
|
||||
Post,
|
||||
|
|
@ -56,179 +75,228 @@ pub(crate) enum RateLimitType {
|
|||
ImportUserSettings,
|
||||
}
|
||||
|
||||
type Map<K, C> = HashMap<K, RateLimitedGroup<C>>;
|
||||
|
||||
#[derive(PartialEq, Debug, Clone)]
|
||||
struct RateLimitedGroup<C> {
|
||||
total: EnumMap<RateLimitType, RateLimitBucket>,
|
||||
total: EnumMap<ActionType, Bucket>,
|
||||
children: C,
|
||||
}
|
||||
|
||||
type Map<K, C> = HashMap<K, RateLimitedGroup<C>>;
|
||||
|
||||
/// Implemented for `()`, `Map<T, ()>`, `Map<T, Map<U, ()>>`, etc.
|
||||
trait MapLevel: Default {
|
||||
type CapacityFactors;
|
||||
type AddrParts;
|
||||
|
||||
fn check(
|
||||
&mut self,
|
||||
action_type: ActionType,
|
||||
now: InstantSecs,
|
||||
configs: EnumMap<ActionType, BucketConfig>,
|
||||
capacity_factors: Self::CapacityFactors,
|
||||
addr_parts: Self::AddrParts,
|
||||
) -> bool;
|
||||
|
||||
/// Remove full buckets and return `true` if there's any buckets remaining
|
||||
fn remove_full_buckets(
|
||||
&mut self,
|
||||
now: InstantSecs,
|
||||
configs: EnumMap<ActionType, BucketConfig>,
|
||||
) -> bool;
|
||||
}
|
||||
|
||||
impl<K: Eq + Hash, C: MapLevel> MapLevel for Map<K, C> {
|
||||
type CapacityFactors = (u32, C::CapacityFactors);
|
||||
type AddrParts = (K, C::AddrParts);
|
||||
|
||||
fn check(
|
||||
&mut self,
|
||||
action_type: ActionType,
|
||||
now: InstantSecs,
|
||||
configs: EnumMap<ActionType, BucketConfig>,
|
||||
(capacity_factor, child_capacity_factors): Self::CapacityFactors,
|
||||
(addr_part, child_addr_parts): Self::AddrParts,
|
||||
) -> bool {
|
||||
// Multiplies capacities by `capacity_factor` for groups in `self`
|
||||
let adjusted_configs = configs.map(|_, config| BucketConfig {
|
||||
capacity: config.capacity.saturating_mul(capacity_factor),
|
||||
..config
|
||||
});
|
||||
|
||||
// Remove groups that are no longer needed if the hash map's existing allocation has no space for new groups.
|
||||
// This is done before calling `HashMap::entry` because that immediately allocates just like `HashMap::insert`.
|
||||
if (self.capacity() == self.len()) && !self.contains_key(&addr_part) {
|
||||
self.remove_full_buckets(now, configs);
|
||||
}
|
||||
|
||||
let group = self
|
||||
.entry(addr_part)
|
||||
.or_insert(RateLimitedGroup::new(now, adjusted_configs));
|
||||
|
||||
#[allow(clippy::indexing_slicing)]
|
||||
let total_passes = group.check_total(action_type, now, adjusted_configs[action_type]);
|
||||
|
||||
let children_pass = group.children.check(
|
||||
action_type,
|
||||
now,
|
||||
configs,
|
||||
child_capacity_factors,
|
||||
child_addr_parts,
|
||||
);
|
||||
|
||||
total_passes && children_pass
|
||||
}
|
||||
|
||||
fn remove_full_buckets(
|
||||
&mut self,
|
||||
now: InstantSecs,
|
||||
configs: EnumMap<ActionType, BucketConfig>,
|
||||
) -> bool {
|
||||
self.retain(|_key, group| {
|
||||
let some_children_remaining = group.children.remove_full_buckets(now, configs);
|
||||
|
||||
// Evaluated if `some_children_remaining` is false
|
||||
let total_has_refill_in_future = || {
|
||||
group.total.into_iter().all(|(action_type, bucket)| {
|
||||
#[allow(clippy::indexing_slicing)]
|
||||
let config = configs[action_type];
|
||||
bucket.update(now, config).tokens != config.capacity
|
||||
})
|
||||
};
|
||||
|
||||
some_children_remaining || total_has_refill_in_future()
|
||||
});
|
||||
|
||||
self.shrink_to_fit();
|
||||
|
||||
!self.is_empty()
|
||||
}
|
||||
}
|
||||
|
||||
impl MapLevel for () {
|
||||
type CapacityFactors = ();
|
||||
type AddrParts = ();
|
||||
|
||||
fn check(
|
||||
&mut self,
|
||||
_: ActionType,
|
||||
_: InstantSecs,
|
||||
_: EnumMap<ActionType, BucketConfig>,
|
||||
_: Self::CapacityFactors,
|
||||
_: Self::AddrParts,
|
||||
) -> bool {
|
||||
true
|
||||
}
|
||||
|
||||
fn remove_full_buckets(&mut self, _: InstantSecs, _: EnumMap<ActionType, BucketConfig>) -> bool {
|
||||
false
|
||||
}
|
||||
}
|
||||
|
||||
impl<C: Default> RateLimitedGroup<C> {
|
||||
fn new(now: InstantSecs) -> Self {
|
||||
fn new(now: InstantSecs, configs: EnumMap<ActionType, BucketConfig>) -> Self {
|
||||
RateLimitedGroup {
|
||||
total: enum_map! {
|
||||
_ => RateLimitBucket {
|
||||
total: configs.map(|_, config| Bucket {
|
||||
last_checked: now,
|
||||
tokens: UNINITIALIZED_TOKEN_AMOUNT,
|
||||
},
|
||||
},
|
||||
tokens: config.capacity,
|
||||
}),
|
||||
// `HashMap::new()` or `()`
|
||||
children: Default::default(),
|
||||
}
|
||||
}
|
||||
|
||||
fn check_total(
|
||||
&mut self,
|
||||
type_: RateLimitType,
|
||||
action_type: ActionType,
|
||||
now: InstantSecs,
|
||||
capacity: i32,
|
||||
secs_to_refill: i32,
|
||||
config: BucketConfig,
|
||||
) -> bool {
|
||||
let capacity = capacity as f32;
|
||||
let secs_to_refill = secs_to_refill as f32;
|
||||
|
||||
#[allow(clippy::indexing_slicing)] // `EnumMap` has no `get` funciton
|
||||
let bucket = &mut self.total[type_];
|
||||
let bucket = &mut self.total[action_type];
|
||||
|
||||
if bucket.tokens == UNINITIALIZED_TOKEN_AMOUNT {
|
||||
bucket.tokens = capacity;
|
||||
}
|
||||
let new_bucket = bucket.update(now, config);
|
||||
|
||||
let secs_since_last_checked = now.secs_since(bucket.last_checked) as f32;
|
||||
bucket.last_checked = now;
|
||||
|
||||
// For `secs_since_last_checked` seconds, increase `bucket.tokens`
|
||||
// by `capacity` every `secs_to_refill` seconds
|
||||
bucket.tokens += {
|
||||
let tokens_per_sec = capacity / secs_to_refill;
|
||||
secs_since_last_checked * tokens_per_sec
|
||||
};
|
||||
|
||||
// Prevent `bucket.tokens` from exceeding `capacity`
|
||||
if bucket.tokens > capacity {
|
||||
bucket.tokens = capacity;
|
||||
}
|
||||
|
||||
if bucket.tokens < 1.0 {
|
||||
if new_bucket.tokens == 0 {
|
||||
// Not enough tokens yet
|
||||
debug!(
|
||||
"Rate limited type: {}, time_passed: {}, allowance: {}",
|
||||
type_.as_ref(),
|
||||
secs_since_last_checked,
|
||||
bucket.tokens
|
||||
);
|
||||
// Setting `bucket` to `new_bucket` here is useless and would cause the bucket to start over at 0 tokens because of rounding
|
||||
false
|
||||
} else {
|
||||
// Consume 1 token
|
||||
bucket.tokens -= 1.0;
|
||||
*bucket = new_bucket;
|
||||
bucket.tokens -= 1;
|
||||
true
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/// Rate limiting based on rate type and IP addr
|
||||
#[derive(PartialEq, Debug, Clone, Default)]
|
||||
pub struct RateLimitStorage {
|
||||
/// One bucket per individual IPv4 address
|
||||
#[derive(PartialEq, Debug, Clone)]
|
||||
pub struct RateLimitState {
|
||||
/// Each individual IPv4 address gets one `RateLimitedGroup`.
|
||||
ipv4_buckets: Map<Ipv4Addr, ()>,
|
||||
/// Seperate buckets for 48, 56, and 64 bit prefixes of IPv6 addresses
|
||||
/// All IPv6 addresses that share the same first 64 bits share the same `RateLimitedGroup`.
|
||||
///
|
||||
/// The same thing happens for the first 48 and 56 bits, but with increased capacity.
|
||||
///
|
||||
/// This is done because all users can easily switch to any other IPv6 address that has the same first 64 bits.
|
||||
/// It could be as low as 48 bits for some networks, which is the reason for 48 and 56 bit address groups.
|
||||
ipv6_buckets: Map<[u8; 6], Map<u8, Map<u8, ()>>>,
|
||||
/// This stores a `BucketConfig` for each `ActionType`. `EnumMap` makes it impossible to have a missing `BucketConfig`.
|
||||
bucket_configs: EnumMap<ActionType, BucketConfig>,
|
||||
}
|
||||
|
||||
impl RateLimitStorage {
|
||||
impl RateLimitState {
|
||||
pub fn new(bucket_configs: EnumMap<ActionType, BucketConfig>) -> Self {
|
||||
RateLimitState {
|
||||
ipv4_buckets: HashMap::new(),
|
||||
ipv6_buckets: HashMap::new(),
|
||||
bucket_configs,
|
||||
}
|
||||
}
|
||||
|
||||
/// Rate limiting Algorithm described here: https://stackoverflow.com/a/668327/1655478
|
||||
///
|
||||
/// Returns true if the request passed the rate limit, false if it failed and should be rejected.
|
||||
pub(super) fn check_rate_limit_full(
|
||||
&mut self,
|
||||
type_: RateLimitType,
|
||||
ip: IpAddr,
|
||||
capacity: i32,
|
||||
secs_to_refill: i32,
|
||||
now: InstantSecs,
|
||||
) -> bool {
|
||||
let mut result = true;
|
||||
|
||||
match ip {
|
||||
pub fn check(&mut self, action_type: ActionType, ip: IpAddr, now: InstantSecs) -> bool {
|
||||
let result = match ip {
|
||||
IpAddr::V4(ipv4) => {
|
||||
// Only used by one address.
|
||||
let group = self
|
||||
self
|
||||
.ipv4_buckets
|
||||
.entry(ipv4)
|
||||
.or_insert(RateLimitedGroup::new(now));
|
||||
|
||||
result &= group.check_total(type_, now, capacity, secs_to_refill);
|
||||
.check(action_type, now, self.bucket_configs, (1, ()), (ipv4, ()))
|
||||
}
|
||||
|
||||
IpAddr::V6(ipv6) => {
|
||||
let (key_48, key_56, key_64) = split_ipv6(ipv6);
|
||||
|
||||
// Contains all addresses with the same first 48 bits. These addresses might be part of the same network.
|
||||
let group_48 = self
|
||||
.ipv6_buckets
|
||||
.entry(key_48)
|
||||
.or_insert(RateLimitedGroup::new(now));
|
||||
result &= group_48.check_total(type_, now, capacity.saturating_mul(16), secs_to_refill);
|
||||
|
||||
// Contains all addresses with the same first 56 bits. These addresses might be part of the same network.
|
||||
let group_56 = group_48
|
||||
.children
|
||||
.entry(key_56)
|
||||
.or_insert(RateLimitedGroup::new(now));
|
||||
result &= group_56.check_total(type_, now, capacity.saturating_mul(4), secs_to_refill);
|
||||
|
||||
// A group with no children. It is shared by all addresses with the same first 64 bits. These addresses are always part of the same network.
|
||||
let group_64 = group_56
|
||||
.children
|
||||
.entry(key_64)
|
||||
.or_insert(RateLimitedGroup::new(now));
|
||||
|
||||
result &= group_64.check_total(type_, now, capacity, secs_to_refill);
|
||||
self.ipv6_buckets.check(
|
||||
action_type,
|
||||
now,
|
||||
self.bucket_configs,
|
||||
(16, (4, (1, ()))),
|
||||
(key_48, (key_56, (key_64, ()))),
|
||||
)
|
||||
}
|
||||
};
|
||||
|
||||
if !result {
|
||||
debug!("Rate limited IP: {ip}");
|
||||
debug!("Rate limited IP: {ip}, type: {action_type:?}");
|
||||
}
|
||||
|
||||
result
|
||||
}
|
||||
|
||||
/// Remove buckets older than the given duration
|
||||
pub(super) fn remove_older_than(&mut self, duration: Duration, now: InstantSecs) {
|
||||
// Only retain buckets that were last used after `instant`
|
||||
let Some(instant) = now.to_instant().checked_sub(duration) else {
|
||||
return;
|
||||
};
|
||||
|
||||
let is_recently_used = |group: &RateLimitedGroup<_>| {
|
||||
group
|
||||
.total
|
||||
.values()
|
||||
.all(|bucket| bucket.last_checked.to_instant() > instant)
|
||||
};
|
||||
|
||||
retain_and_shrink(&mut self.ipv4_buckets, |_, group| is_recently_used(group));
|
||||
|
||||
retain_and_shrink(&mut self.ipv6_buckets, |_, group_48| {
|
||||
retain_and_shrink(&mut group_48.children, |_, group_56| {
|
||||
retain_and_shrink(&mut group_56.children, |_, group_64| {
|
||||
is_recently_used(group_64)
|
||||
});
|
||||
!group_56.children.is_empty()
|
||||
});
|
||||
!group_48.children.is_empty()
|
||||
})
|
||||
/// Remove buckets that are now full
|
||||
pub fn remove_full_buckets(&mut self, now: InstantSecs) {
|
||||
self
|
||||
.ipv4_buckets
|
||||
.remove_full_buckets(now, self.bucket_configs);
|
||||
self
|
||||
.ipv6_buckets
|
||||
.remove_full_buckets(now, self.bucket_configs);
|
||||
}
|
||||
}
|
||||
|
||||
fn retain_and_shrink<K, V, F>(map: &mut HashMap<K, V>, f: F)
|
||||
where
|
||||
K: Eq + Hash,
|
||||
F: FnMut(&K, &mut V) -> bool,
|
||||
{
|
||||
map.retain(f);
|
||||
map.shrink_to_fit();
|
||||
pub fn set_config(&mut self, new_configs: EnumMap<ActionType, BucketConfig>) {
|
||||
self.bucket_configs = new_configs;
|
||||
}
|
||||
}
|
||||
|
||||
fn split_ipv6(ip: Ipv6Addr) -> ([u8; 6], u8, u8) {
|
||||
|
|
@ -241,6 +309,8 @@ mod tests {
|
|||
#![allow(clippy::unwrap_used)]
|
||||
#![allow(clippy::indexing_slicing)]
|
||||
|
||||
use super::{ActionType, BucketConfig, InstantSecs, RateLimitState, RateLimitedGroup};
|
||||
|
||||
#[test]
|
||||
fn test_split_ipv6() {
|
||||
let ip = std::net::Ipv6Addr::new(
|
||||
|
|
@ -254,9 +324,20 @@ mod tests {
|
|||
|
||||
#[test]
|
||||
fn test_rate_limiter() {
|
||||
let mut rate_limiter = super::RateLimitStorage::default();
|
||||
let mut now = super::InstantSecs::now();
|
||||
let bucket_configs = enum_map::enum_map! {
|
||||
ActionType::Message => BucketConfig {
|
||||
capacity: 2,
|
||||
secs_to_refill: 1,
|
||||
},
|
||||
_ => BucketConfig {
|
||||
capacity: 2,
|
||||
secs_to_refill: 1,
|
||||
},
|
||||
};
|
||||
let mut rate_limiter = RateLimitState::new(bucket_configs);
|
||||
let mut now = InstantSecs::now();
|
||||
|
||||
// Do 1 `Message` and 1 `Post` action for each IP address, and expect the limit to not be reached
|
||||
let ips = [
|
||||
"123.123.123.123",
|
||||
"1:2:3::",
|
||||
|
|
@ -266,66 +347,71 @@ mod tests {
|
|||
];
|
||||
for ip in ips {
|
||||
let ip = ip.parse().unwrap();
|
||||
let message_passed =
|
||||
rate_limiter.check_rate_limit_full(super::RateLimitType::Message, ip, 2, 1, now);
|
||||
let post_passed =
|
||||
rate_limiter.check_rate_limit_full(super::RateLimitType::Post, ip, 3, 1, now);
|
||||
let message_passed = rate_limiter.check(ActionType::Message, ip, now);
|
||||
let post_passed = rate_limiter.check(ActionType::Post, ip, now);
|
||||
assert!(message_passed);
|
||||
assert!(post_passed);
|
||||
}
|
||||
|
||||
#[allow(clippy::indexing_slicing)]
|
||||
let expected_buckets = |factor: f32, tokens_consumed: f32| {
|
||||
let mut buckets = super::RateLimitedGroup::<()>::new(now).total;
|
||||
buckets[super::RateLimitType::Message] = super::RateLimitBucket {
|
||||
last_checked: now,
|
||||
tokens: (2.0 * factor) - tokens_consumed,
|
||||
};
|
||||
buckets[super::RateLimitType::Post] = super::RateLimitBucket {
|
||||
last_checked: now,
|
||||
tokens: (3.0 * factor) - tokens_consumed,
|
||||
};
|
||||
let expected_buckets = |factor: u32, tokens_consumed: u32| {
|
||||
let adjusted_configs = bucket_configs.map(|_, config| BucketConfig {
|
||||
capacity: config.capacity.saturating_mul(factor),
|
||||
..config
|
||||
});
|
||||
let mut buckets = RateLimitedGroup::<()>::new(now, adjusted_configs).total;
|
||||
buckets[ActionType::Message].tokens -= tokens_consumed;
|
||||
buckets[ActionType::Post].tokens -= tokens_consumed;
|
||||
buckets
|
||||
};
|
||||
|
||||
let bottom_group = |tokens_consumed| super::RateLimitedGroup {
|
||||
total: expected_buckets(1.0, tokens_consumed),
|
||||
let bottom_group = |tokens_consumed| RateLimitedGroup {
|
||||
total: expected_buckets(1, tokens_consumed),
|
||||
children: (),
|
||||
};
|
||||
|
||||
assert_eq!(
|
||||
rate_limiter,
|
||||
super::RateLimitStorage {
|
||||
ipv4_buckets: [([123, 123, 123, 123].into(), bottom_group(1.0)),].into(),
|
||||
RateLimitState {
|
||||
bucket_configs,
|
||||
ipv4_buckets: [([123, 123, 123, 123].into(), bottom_group(1))].into(),
|
||||
ipv6_buckets: [(
|
||||
[0, 1, 0, 2, 0, 3],
|
||||
super::RateLimitedGroup {
|
||||
total: expected_buckets(16.0, 4.0),
|
||||
RateLimitedGroup {
|
||||
total: expected_buckets(16, 4),
|
||||
children: [
|
||||
(
|
||||
0,
|
||||
super::RateLimitedGroup {
|
||||
total: expected_buckets(4.0, 1.0),
|
||||
children: [(0, bottom_group(1.0)),].into(),
|
||||
RateLimitedGroup {
|
||||
total: expected_buckets(4, 1),
|
||||
children: [(0, bottom_group(1))].into(),
|
||||
}
|
||||
),
|
||||
(
|
||||
4,
|
||||
super::RateLimitedGroup {
|
||||
total: expected_buckets(4.0, 3.0),
|
||||
children: [(0, bottom_group(1.0)), (5, bottom_group(2.0)),].into(),
|
||||
RateLimitedGroup {
|
||||
total: expected_buckets(4, 3),
|
||||
children: [(0, bottom_group(1)), (5, bottom_group(2))].into(),
|
||||
}
|
||||
),
|
||||
]
|
||||
.into(),
|
||||
}
|
||||
),]
|
||||
)]
|
||||
.into(),
|
||||
}
|
||||
);
|
||||
|
||||
// Do 2 `Message` actions for 1 IP address and expect only the 2nd one to fail
|
||||
for expected_to_pass in [true, false] {
|
||||
let ip = "1:2:3:0400::".parse().unwrap();
|
||||
let passed = rate_limiter.check(ActionType::Message, ip, now);
|
||||
assert_eq!(passed, expected_to_pass);
|
||||
}
|
||||
|
||||
// Expect `remove_full_buckets` to remove everything when called 2 seconds later
|
||||
now.secs += 2;
|
||||
rate_limiter.remove_older_than(std::time::Duration::from_secs(1), now);
|
||||
rate_limiter.remove_full_buckets(now);
|
||||
assert!(rate_limiter.ipv4_buckets.is_empty());
|
||||
assert!(rate_limiter.ipv6_buckets.is_empty());
|
||||
}
|
||||
|
|
|
|||
|
|
@ -156,7 +156,7 @@ pub async fn start_lemmy_server(args: CmdArgs) -> Result<(), LemmyError> {
|
|||
// Set up the rate limiter
|
||||
let rate_limit_config =
|
||||
local_site_rate_limit_to_rate_limit_config(&site_view.local_site_rate_limit);
|
||||
let rate_limit_cell = RateLimitCell::new(rate_limit_config).await;
|
||||
let rate_limit_cell = RateLimitCell::new(rate_limit_config);
|
||||
|
||||
println!(
|
||||
"Starting http server at {}:{}",
|
||||
|
|
@ -298,7 +298,7 @@ fn create_http_server(
|
|||
.expect("Should always be buildable");
|
||||
|
||||
let context: LemmyContext = federation_config.deref().clone();
|
||||
let rate_limit_cell = federation_config.settings_updated_channel().clone();
|
||||
let rate_limit_cell = federation_config.rate_limit_cell().clone();
|
||||
let self_origin = settings.get_protocol_and_hostname();
|
||||
// Create Http server with websocket support
|
||||
let server = HttpServer::new(move || {
|
||||
|
|
|
|||
|
|
@ -78,17 +78,6 @@ pub async fn setup(context: LemmyContext) -> Result<(), LemmyError> {
|
|||
}
|
||||
});
|
||||
|
||||
let context_1 = context.clone();
|
||||
// Remove old rate limit buckets after 1 to 2 hours of inactivity
|
||||
scheduler.every(CTimeUnits::hour(1)).run(move || {
|
||||
let context = context_1.clone();
|
||||
|
||||
async move {
|
||||
let hour = Duration::from_secs(3600);
|
||||
context.settings_updated_channel().remove_older_than(hour);
|
||||
}
|
||||
});
|
||||
|
||||
let context_1 = context.clone();
|
||||
// Overwrite deleted & removed posts and comments every day
|
||||
scheduler.every(CTimeUnits::days(1)).run(move || {
|
||||
|
|
|
|||
|
|
@ -112,7 +112,7 @@ mod tests {
|
|||
traits::Crud,
|
||||
utils::build_db_pool_for_tests,
|
||||
};
|
||||
use lemmy_utils::rate_limit::{RateLimitCell, RateLimitConfig};
|
||||
use lemmy_utils::rate_limit::RateLimitCell;
|
||||
use reqwest::Client;
|
||||
use reqwest_middleware::ClientBuilder;
|
||||
use serial_test::serial;
|
||||
|
|
@ -131,9 +131,7 @@ mod tests {
|
|||
pool_.clone(),
|
||||
ClientBuilder::new(Client::default()).build(),
|
||||
secret,
|
||||
RateLimitCell::new(RateLimitConfig::builder().build())
|
||||
.await
|
||||
.clone(),
|
||||
RateLimitCell::with_test_config(),
|
||||
);
|
||||
|
||||
let inserted_instance = Instance::read_or_create(pool, "my_domain.tld".to_string())
|
||||
|
|
|
|||
Loading…
Reference in a new issue