Move feed fetching to crawl_feed job, DomainRequestLimiter
`DomainRequestLimiter` is a distributed version of `DomainLocks` based on redis.
This commit is contained in:
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53
Cargo.lock
generated
53
Cargo.lock
generated
@ -605,12 +605,9 @@ dependencies = [
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[[package]]
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name = "cookie-factory"
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version = "0.3.3"
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version = "0.3.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9885fa71e26b8ab7855e2ec7cae6e9b380edff76cd052e07c683a0319d51b3a2"
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dependencies = [
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"futures",
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]
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checksum = "396de984970346b0d9e93d1415082923c679e5ae5c3ee3dcbd104f5610af126b"
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[[package]]
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name = "core-foundation"
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@ -658,6 +655,7 @@ dependencies = [
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"clap",
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"dotenvy",
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"feed-rs",
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"fred 9.1.2",
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"futures",
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"headers",
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"http 1.1.0",
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@ -668,6 +666,7 @@ dependencies = [
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"once_cell",
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"opml",
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"password-auth",
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"rand",
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"readability",
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"reqwest 0.12.4",
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"serde",
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@ -1014,7 +1013,33 @@ dependencies = [
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"log",
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"parking_lot",
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"rand",
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"redis-protocol",
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"redis-protocol 4.1.0",
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"semver",
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"socket2",
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"tokio",
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"tokio-stream",
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"tokio-util",
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"url",
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"urlencoding",
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]
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[[package]]
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name = "fred"
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version = "9.1.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "152397076bd317aa06bca9666e954ad15cde1a8f17b6ea4b007cf0bfc074d1d0"
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dependencies = [
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"arc-swap",
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"async-trait",
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"bytes",
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"bytes-utils",
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"crossbeam-queue",
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"float-cmp",
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"futures",
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"log",
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"parking_lot",
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"rand",
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"redis-protocol 5.0.1",
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"semver",
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"socket2",
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"tokio",
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@ -2533,6 +2558,20 @@ dependencies = [
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"nom",
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]
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[[package]]
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name = "redis-protocol"
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version = "5.0.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "65deb7c9501fbb2b6f812a30d59c0253779480853545153a51d8e9e444ddc99f"
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dependencies = [
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"bytes",
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"bytes-utils",
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"cookie-factory",
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"crc16",
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"log",
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"nom",
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]
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[[package]]
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name = "redox_syscall"
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version = "0.4.1"
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@ -3684,7 +3723,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "0460effd120251714fae61067fa3e8b2a3c8202501cdcae375d4bd14194c85cf"
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dependencies = [
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"async-trait",
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"fred",
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"fred 8.0.6",
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"rmp-serde",
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"thiserror",
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"time",
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@ -31,6 +31,7 @@ chrono = { version = "0.4", features = ["serde"] }
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clap = { version = "4.4", features = ["derive", "env"] }
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dotenvy = "0.15"
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feed-rs = "1.3"
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fred = "9"
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futures = "0.3"
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headers = "0.4"
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http = "1.0.0"
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@ -44,6 +45,7 @@ notify = "6"
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once_cell = "1.18"
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opml = "1.1"
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password-auth = "1.0"
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rand = { version = "0.8", features = ["small_rng"] }
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readability = "0.3"
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reqwest = { version = "0.12", features = ["json"] }
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serde = { version = "1", features = ["derive"] }
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@ -66,7 +66,9 @@ pub async fn crawl_fn(job: Crawl, state: Data<Arc<State>>) -> Result<(), CrawlEr
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// self.spawn_crawler_loop(feed, respond_to.clone());
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// TODO: implement uniqueness on jobs per feed for ~1 minute
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apalis
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.push(AsyncJob::CrawlFeed(CrawlFeedJob { feed }))
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.push(AsyncJob::CrawlFeed(CrawlFeedJob {
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feed_id: feed.feed_id,
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}))
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.await
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.map_err(|err| CrawlError::QueueJobError(err.to_string()))?;
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}
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@ -5,11 +5,16 @@ use apalis::prelude::*;
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use apalis_redis::RedisStorage;
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use clap::Parser;
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use dotenvy::dotenv;
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use fred::prelude::*;
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use reqwest::Client;
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use sqlx::postgres::PgPoolOptions;
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use tower::retry::RetryLayer;
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use lib::config::Config;
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use lib::domain_request_limiter::DomainRequestLimiter;
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use lib::jobs::{handle_async_job, AsyncJob};
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use lib::log::init_worker_tracing;
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use lib::USER_AGENT;
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#[tokio::main]
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async fn main() -> Result<()> {
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@ -23,11 +28,27 @@ async fn main() -> Result<()> {
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let apalis_storage: RedisStorage<AsyncJob> =
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RedisStorage::new_with_config(redis_conn, apalis_config);
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let redis_config = RedisConfig::from_url(&config.redis_url)?;
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let redis_pool = RedisPool::new(redis_config, None, None, None, 5)?;
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redis_pool.connect();
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redis_pool.wait_for_connect().await?;
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let domain_request_limiter = DomainRequestLimiter::new(redis_pool, 10, 5, 100, 0.5);
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let http_client = Client::builder().user_agent(USER_AGENT).build()?;
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let db = PgPoolOptions::new()
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.max_connections(config.database_max_connections)
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.acquire_timeout(std::time::Duration::from_secs(3))
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.connect(&config.database_url)
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.await?;
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Monitor::<TokioExecutor>::new()
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.register_with_count(2, {
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WorkerBuilder::new("worker")
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.layer(RetryLayer::new(RetryPolicy::default()))
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.layer(TraceLayer::new())
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.data(http_client)
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.data(db)
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.data(domain_request_limiter)
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.backend(apalis_storage)
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.build_fn(handle_async_job)
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})
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123
src/domain_request_limiter.rs
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123
src/domain_request_limiter.rs
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@ -0,0 +1,123 @@
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use anyhow::{anyhow, Result};
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use fred::{clients::RedisPool, interfaces::KeysInterface, prelude::*};
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use rand::{rngs::SmallRng, Rng, SeedableRng};
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use std::{sync::Arc, time::Duration};
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use tokio::{sync::Mutex, time::sleep};
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/// A Redis-based rate limiter for domain-specific requests with jittered retry delay.
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///
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/// This limiter uses a fixed window algorithm with a 1-second window and applies
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/// jitter to the retry delay to help prevent synchronized retries in distributed systems.
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/// It uses fred's RedisPool for efficient connection management.
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///
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/// Limitations:
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/// 1. Fixed window: The limit resets every second, potentially allowing short traffic bursts
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/// at window boundaries.
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/// 2. No token bucket: Doesn't accumulate unused capacity from quiet periods.
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/// 3. Potential overcounting: In distributed systems, there's a small chance of overcounting
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/// near window ends due to race conditions.
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/// 4. Redis dependency: Rate limiting fails open if Redis is unavailable.
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/// 5. Blocking: The acquire method will block until a request is allowed or max_retries is reached.
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///
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/// Usage example:
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/// ```
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/// use fred::prelude::*;
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///
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/// #[tokio::main]
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/// async fn main() -> Result<()> {
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/// let config = RedisConfig::default();
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/// let pool = RedisPool::new(config, None, None, 5)?;
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/// pool.connect();
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/// pool.wait_for_connect().await?;
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///
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/// let limiter = DomainRequestLimiter::new(pool, 10, 5, 100, 0.5);
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/// let domain = "example.com";
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///
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/// for _ in 0..15 {
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/// match limiter.acquire(domain).await {
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/// Ok(()) => println!("Request allowed"),
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/// Err(_) => println!("Max retries reached, request denied"),
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/// }
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/// }
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///
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/// Ok(())
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/// }
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/// ```
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#[derive(Debug, Clone)]
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pub struct DomainRequestLimiter {
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redis_pool: RedisPool,
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requests_per_second: u32,
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max_retries: u32,
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base_retry_delay_ms: u64,
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jitter_factor: f64,
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// TODO: I think I can get rid of this if I instantiate a DomainRequestLimiter per-worker, but
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// I'm not sure how to do that in apalis (then I could just use thread_rng)
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rng: Arc<Mutex<SmallRng>>,
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}
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impl DomainRequestLimiter {
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/// Create a new DomainRequestLimiter.
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///
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/// # Arguments
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/// * `redis_pool` - A fred RedisPool.
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/// * `requests_per_second` - Maximum allowed requests per second per domain.
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/// * `max_retries` - Maximum number of retries before giving up.
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/// * `base_retry_delay_ms` - Base delay between retries in milliseconds.
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/// * `jitter_factor` - Factor to determine the maximum jitter (0.0 to 1.0).
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pub fn new(
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redis_pool: RedisPool,
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requests_per_second: u32,
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max_retries: u32,
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base_retry_delay_ms: u64,
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jitter_factor: f64,
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) -> Self {
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Self {
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redis_pool,
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requests_per_second,
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max_retries,
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base_retry_delay_ms,
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jitter_factor: jitter_factor.clamp(0.0, 1.0),
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rng: Arc::new(Mutex::new(SmallRng::from_entropy())),
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}
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}
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/// Attempt to acquire permission for a request, retrying if necessary.
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///
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/// This method will attempt to acquire permission up to max_retries times,
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/// sleeping for a jittered delay between each attempt.
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///
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/// # Arguments
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/// * `domain` - The domain for which to check the rate limit.
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///
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/// # Returns
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/// Ok(()) if permission is granted, or an error if max retries are exceeded.
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pub async fn acquire(&self, domain: &str) -> Result<()> {
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for attempt in 0..=self.max_retries {
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if self.try_acquire(domain).await? {
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return Ok(());
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}
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if attempt < self.max_retries {
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let mut rng = self.rng.lock().await;
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let jitter =
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rng.gen::<f64>() * self.jitter_factor * self.base_retry_delay_ms as f64;
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let delay = self.base_retry_delay_ms + jitter as u64;
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sleep(Duration::from_millis(delay)).await;
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}
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}
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Err(anyhow!(
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"Max retries exceeded for domain: {:?}, request denied",
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domain
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))
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}
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async fn try_acquire(&self, domain: &str) -> Result<bool, RedisError> {
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let key = format!("rate_limit:{}", domain);
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let count: u32 = self.redis_pool.incr(&key).await?;
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if count == 1 {
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self.redis_pool.expire(&key, 1).await?;
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}
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Ok(count <= self.requests_per_second)
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}
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}
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@ -1,16 +1,188 @@
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use anyhow::Result;
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use serde::{Deserialize, Serialize};
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use tracing::{info, instrument};
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use std::cmp::Ordering;
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use crate::models::feed::Feed;
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use anyhow::{anyhow, Result};
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use apalis::prelude::*;
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use chrono::{Duration, Utc};
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use feed_rs::parser;
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use http::{header, HeaderMap, StatusCode};
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use reqwest::Client;
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use serde::{Deserialize, Serialize};
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use sqlx::PgPool;
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use tracing::{info, info_span, instrument, warn};
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use url::Url;
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use uuid::Uuid;
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use crate::domain_request_limiter::DomainRequestLimiter;
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use crate::models::entry::{CreateEntry, Entry};
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use crate::models::feed::{Feed, MAX_CRAWL_INTERVAL_MINUTES, MIN_CRAWL_INTERVAL_MINUTES};
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#[derive(Debug, Deserialize, Serialize, Clone)]
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pub struct CrawlFeedJob {
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pub feed: Feed,
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pub feed_id: Uuid,
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}
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#[instrument(skip_all, fields(feed_id = %feed.feed_id))]
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pub async fn crawl_feed(CrawlFeedJob { feed }: CrawlFeedJob) -> Result<()> {
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info!("Crawling feed: {:?}", feed.feed_id);
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Err(anyhow::anyhow!("Not implemented"))
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#[instrument(skip_all, fields(feed_id = %feed_id))]
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pub async fn crawl_feed(
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CrawlFeedJob { feed_id }: CrawlFeedJob,
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http_client: Data<Client>,
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db: Data<PgPool>,
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domain_request_limiter: Data<DomainRequestLimiter>,
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) -> Result<()> {
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let mut feed = Feed::get(&*db, feed_id).await?;
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info!("got feed from db");
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let url = Url::parse(&feed.url)?;
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let domain = url
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.domain()
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.ok_or(anyhow!("invalid url: {:?}", feed.url.clone()))?;
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let mut headers = HeaderMap::new();
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if let Some(etag) = &feed.etag_header {
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if let Ok(etag) = etag.parse() {
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headers.insert(header::IF_NONE_MATCH, etag);
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} else {
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warn!(%etag, "failed to parse saved etag header");
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}
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}
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if let Some(last_modified) = &feed.last_modified_header {
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if let Ok(last_modified) = last_modified.parse() {
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headers.insert(header::IF_MODIFIED_SINCE, last_modified);
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} else {
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warn!(
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%last_modified,
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"failed to parse saved last_modified header",
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);
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}
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}
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info!(url=%url, "starting fetch");
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domain_request_limiter.acquire(domain).await?;
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let resp = http_client.get(url.clone()).headers(headers).send().await?;
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let headers = resp.headers();
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if let Some(etag) = headers.get(header::ETAG) {
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if let Ok(etag) = etag.to_str() {
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feed.etag_header = Some(etag.to_string());
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} else {
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warn!(?etag, "failed to convert response etag header to string");
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}
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}
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if let Some(last_modified) = headers.get(header::LAST_MODIFIED) {
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if let Ok(last_modified) = last_modified.to_str() {
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feed.last_modified_header = Some(last_modified.to_string());
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} else {
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warn!(
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?last_modified,
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"failed to convert response last_modified header to string",
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);
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}
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}
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info!(url=%url, "fetched feed");
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if resp.status() == StatusCode::NOT_MODIFIED {
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info!("feed returned not modified status");
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feed.last_crawled_at = Some(Utc::now());
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feed.last_crawl_error = None;
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feed.save(&*db).await?;
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info!("updated feed in db");
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return Ok(());
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} else if !resp.status().is_success() {
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warn!("feed returned non-successful status");
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feed.last_crawled_at = Some(Utc::now());
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feed.last_crawl_error = resp.status().canonical_reason().map(|s| s.to_string());
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feed.save(&*db).await?;
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info!("updated feed in db");
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return Ok(());
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}
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let bytes = resp.bytes().await?;
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let parsed_feed = parser::parse(&bytes[..])?;
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info!("parsed feed");
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feed.url = url.to_string();
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feed.feed_type = parsed_feed.feed_type.into();
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feed.last_crawled_at = Some(Utc::now());
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feed.last_crawl_error = None;
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if let Some(title) = parsed_feed.title {
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feed.title = Some(title.content);
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}
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if let Some(description) = parsed_feed.description {
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feed.description = Some(description.content);
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}
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let last_entry_published_at = parsed_feed.entries.iter().filter_map(|e| e.published).max();
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if let Some(prev_last_entry_published_at) = feed.last_entry_published_at {
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if let Some(published_at) = last_entry_published_at {
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let time_since_last_entry = if published_at == prev_last_entry_published_at {
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// No new entry since last crawl, compare current time to last publish instead
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Utc::now() - prev_last_entry_published_at
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} else {
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// Compare new entry publish time to previous publish time
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published_at - prev_last_entry_published_at
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};
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match time_since_last_entry.cmp(&Duration::minutes(feed.crawl_interval_minutes.into()))
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{
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Ordering::Greater => {
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feed.crawl_interval_minutes = i32::max(
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(feed.crawl_interval_minutes as f32 * 1.2).ceil() as i32,
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MAX_CRAWL_INTERVAL_MINUTES,
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);
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info!(
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interval = feed.crawl_interval_minutes,
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"increased crawl interval"
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);
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}
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Ordering::Less => {
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feed.crawl_interval_minutes = i32::max(
|
||||
(feed.crawl_interval_minutes as f32 / 1.2).ceil() as i32,
|
||||
MIN_CRAWL_INTERVAL_MINUTES,
|
||||
);
|
||||
info!(
|
||||
interval = feed.crawl_interval_minutes,
|
||||
"decreased crawl interval"
|
||||
);
|
||||
}
|
||||
Ordering::Equal => {}
|
||||
}
|
||||
}
|
||||
}
|
||||
feed.last_entry_published_at = last_entry_published_at;
|
||||
let feed = feed.save(&*db).await?;
|
||||
info!("updated feed in db");
|
||||
|
||||
let mut payload = Vec::with_capacity(parsed_feed.entries.len());
|
||||
for entry in parsed_feed.entries {
|
||||
let entry_span = info_span!("entry", id = entry.id);
|
||||
let _entry_span_guard = entry_span.enter();
|
||||
if let Some(link) = entry.links.get(0) {
|
||||
// if no scraped or feed date is available, fallback to the current time
|
||||
let published_at = entry.published.unwrap_or_else(Utc::now);
|
||||
let entry = CreateEntry {
|
||||
title: entry.title.map(|t| t.content),
|
||||
url: link.href.clone(),
|
||||
description: entry.summary.map(|s| s.content),
|
||||
feed_id: feed.feed_id,
|
||||
published_at,
|
||||
};
|
||||
payload.push(entry);
|
||||
} else {
|
||||
warn!("skipping feed entry with no links");
|
||||
}
|
||||
}
|
||||
let entries = Entry::bulk_upsert(&*db, payload).await?;
|
||||
let (new, updated) = entries
|
||||
.into_iter()
|
||||
.partition::<Vec<_>, _>(|entry| entry.updated_at.is_none());
|
||||
info!(new = new.len(), updated = updated.len(), "saved entries");
|
||||
|
||||
for entry in new {
|
||||
// TODO: queue the entry crawls
|
||||
//
|
||||
// let entry_crawler = EntryCrawlerHandle::new(
|
||||
// self.pool.clone(),
|
||||
// self.client.clone(),
|
||||
// self.domain_locks.clone(),
|
||||
// self.content_dir.clone(),
|
||||
// );
|
||||
// let mut entry_receiver = entry_crawler.crawl(entry).await;
|
||||
// while let Ok(EntryCrawlerHandleMessage::Entry(result)) = entry_receiver.recv().await {
|
||||
// let _ = respond_to.send(FeedCrawlerHandleMessage::Entry(result));
|
||||
// }
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
|
@ -1,6 +1,7 @@
|
||||
use apalis::prelude::*;
|
||||
use apalis_redis::RedisStorage;
|
||||
use reqwest::Client;
|
||||
use serde::{Deserialize, Serialize};
|
||||
use sqlx::PgPool;
|
||||
use thiserror::Error;
|
||||
use tracing::{error, info, instrument};
|
||||
|
||||
@ -8,6 +9,8 @@ mod crawl_feed;
|
||||
|
||||
pub use crawl_feed::CrawlFeedJob;
|
||||
|
||||
use crate::domain_request_limiter::DomainRequestLimiter;
|
||||
|
||||
#[derive(Debug, Deserialize, Serialize, Clone)]
|
||||
pub enum AsyncJob {
|
||||
HelloWorld(String),
|
||||
@ -27,13 +30,18 @@ pub async fn handle_async_job(
|
||||
// TODO: add task_id to tracing instrumentation context
|
||||
// it casuses a panic in 0.6.0 currently, see: https://github.com/geofmureithi/apalis/issues/398
|
||||
// task_id: Data<TaskId>,
|
||||
http_client: Data<Client>,
|
||||
db: Data<PgPool>,
|
||||
domain_request_limiter: Data<DomainRequestLimiter>,
|
||||
) -> Result<(), AsyncJobError> {
|
||||
let result = match job {
|
||||
AsyncJob::HelloWorld(name) => {
|
||||
info!("Hello, {}!", name);
|
||||
Ok(())
|
||||
}
|
||||
AsyncJob::CrawlFeed(job) => crawl_feed::crawl_feed(job).await,
|
||||
AsyncJob::CrawlFeed(job) => {
|
||||
crawl_feed::crawl_feed(job, http_client, db, domain_request_limiter).await
|
||||
}
|
||||
};
|
||||
|
||||
match result {
|
||||
|
@ -3,6 +3,7 @@ pub mod api_response;
|
||||
pub mod auth;
|
||||
pub mod config;
|
||||
pub mod domain_locks;
|
||||
pub mod domain_request_limiter;
|
||||
pub mod error;
|
||||
pub mod handlers;
|
||||
pub mod headers;
|
||||
|
Loading…
Reference in New Issue
Block a user