Make batch size configurable

limitador-server/src/config.rs

@@ -54,6 +54,8 @@ pub mod env {
             value_for("REDIS_LOCAL_CACHE_MAX_TTL_CACHED_COUNTERS_MS");
         pub static ref REDIS_LOCAL_CACHE_FLUSHING_PERIOD_MS: Option<&'static str> =
             value_for("REDIS_LOCAL_CACHE_FLUSHING_PERIOD_MS");
+        pub static ref REDIS_LOCAL_CACHE_BATCH_SIZE: Option<&'static str> =
+            value_for("REDIS_LOCAL_CACHE_BATCH_SIZE");
         pub static ref REDIS_LOCAL_CACHE_TTL_RATIO_CACHED_COUNTERS: Option<&'static str> =
             value_for("REDIS_LOCAL_CACHE_TTL_RATIO_CACHED_COUNTERS");
         pub static ref RATE_LIMIT_HEADERS: Option<&'static str> = value_for("RATE_LIMIT_HEADERS");
@@ -162,6 +164,7 @@ pub struct RedisStorageConfiguration {
 
 #[derive(PartialEq, Eq, Debug)]
 pub struct RedisStorageCacheConfiguration {
+    pub batch_size: usize,
     pub flushing_period: i64,
     pub max_counters: usize,
     pub response_timeout: u64,

limitador-server/src/main.rs

@@ -24,8 +24,8 @@ use limitador::storage::disk::DiskStorage;
 #[cfg(feature = "infinispan")]
 use limitador::storage::infinispan::{Consistency, InfinispanStorageBuilder};
 use limitador::storage::redis::{
-    AsyncRedisStorage, CachedRedisStorage, CachedRedisStorageBuilder, DEFAULT_FLUSHING_PERIOD_SEC,
-    DEFAULT_MAX_CACHED_COUNTERS, DEFAULT_RESPONSE_TIMEOUT_MS,
+    AsyncRedisStorage, CachedRedisStorage, CachedRedisStorageBuilder, DEFAULT_BATCH_SIZE,
+    DEFAULT_FLUSHING_PERIOD_SEC, DEFAULT_MAX_CACHED_COUNTERS, DEFAULT_RESPONSE_TIMEOUT_MS,
 };
 use limitador::storage::{AsyncCounterStorage, AsyncStorage, Storage};
 use limitador::{
@@ -132,6 +132,7 @@ impl Limiter {
         // TODO: Not all the options are configurable via ENV. Add them as needed.
 
         let cached_redis_storage = CachedRedisStorageBuilder::new(redis_url)
+            .batch_size(cache_cfg.batch_size)
             .flushing_period(Duration::from_millis(cache_cfg.flushing_period as u64))
             .max_cached_counters(cache_cfg.max_counters)
             .response_timeout(Duration::from_millis(cache_cfg.response_timeout));
@@ -588,6 +589,18 @@ fn create_config() -> (Configuration, &'static str) {
                 .about("Uses Redis to store counters, with an in-memory cache")
                 .display_order(4)
                 .arg(redis_url_arg)
+                .arg(
+                    Arg::new("batch")
+                        .long("batch-size")
+                        .action(ArgAction::Set)
+                        .value_parser(clap::value_parser!(u64))
+                        .default_value(
+                            config::env::REDIS_LOCAL_CACHE_BATCH_SIZE
+                                .unwrap_or(leak(DEFAULT_BATCH_SIZE)),
+                        )
+                        .display_order(3)
+                        .help("Size of entries to flush in as single flush"),
+                )
                 .arg(
                     Arg::new("flush")
                         .long("flush-period")
@@ -720,6 +733,7 @@ fn create_config() -> (Configuration, &'static str) {
         Some(("redis_cached", sub)) => StorageConfiguration::Redis(RedisStorageConfiguration {
             url: sub.get_one::<String>("URL").unwrap().to_owned(),
             cache: Some(RedisStorageCacheConfiguration {
+                batch_size: *sub.get_one("batch").unwrap(),
                 flushing_period: *sub.get_one("flush").unwrap(),
                 max_counters: *sub.get_one("max").unwrap(),
                 response_timeout: *sub.get_one("timeout").unwrap(),
@@ -799,6 +813,10 @@ fn storage_config_from_env() -> Result<StorageConfiguration, ()> {
             url,
             cache: if env_option_is_enabled("REDIS_LOCAL_CACHE_ENABLED") {
                 Some(RedisStorageCacheConfiguration {
+                    batch_size: env::var("REDIS_LOCAL_CACHE_BATCH_SIZE")
+                        .unwrap_or_else(|_| (DEFAULT_BATCH_SIZE).to_string())
+                        .parse()
+                        .expect("Expected an usize"),
                     flushing_period: env::var("REDIS_LOCAL_CACHE_FLUSHING_PERIOD_MS")
                         .unwrap_or_else(|_| (DEFAULT_FLUSHING_PERIOD_SEC * 1000).to_string())
                         .parse()

limitador/src/storage/redis/mod.rs

@@ -8,6 +8,7 @@ mod redis_sync;
 mod scripts;
 
 pub const DEFAULT_FLUSHING_PERIOD_SEC: u64 = 1;
+pub const DEFAULT_BATCH_SIZE: usize = 100;
 pub const DEFAULT_MAX_CACHED_COUNTERS: usize = 10000;
 pub const DEFAULT_RESPONSE_TIMEOUT_MS: u64 = 350;
 

limitador/src/storage/redis/redis_cached.rs

@@ -7,7 +7,8 @@ use crate::storage::redis::counters_cache::{
 use crate::storage::redis::redis_async::AsyncRedisStorage;
 use crate::storage::redis::scripts::BATCH_UPDATE_COUNTERS;
 use crate::storage::redis::{
-    DEFAULT_FLUSHING_PERIOD_SEC, DEFAULT_MAX_CACHED_COUNTERS, DEFAULT_RESPONSE_TIMEOUT_MS,
+    DEFAULT_BATCH_SIZE, DEFAULT_FLUSHING_PERIOD_SEC, DEFAULT_MAX_CACHED_COUNTERS,
+    DEFAULT_RESPONSE_TIMEOUT_MS,
 };
 use crate::storage::{AsyncCounterStorage, Authorization, StorageErr};
 use async_trait::async_trait;
@@ -146,6 +147,7 @@ impl CachedRedisStorage {
     pub async fn new(redis_url: &str) -> Result<Self, RedisError> {
         Self::new_with_options(
             redis_url,
+            DEFAULT_BATCH_SIZE,
             Duration::from_secs(DEFAULT_FLUSHING_PERIOD_SEC),
             DEFAULT_MAX_CACHED_COUNTERS,
             Duration::from_millis(DEFAULT_RESPONSE_TIMEOUT_MS),
@@ -155,6 +157,7 @@ impl CachedRedisStorage {
 
     async fn new_with_options(
         redis_url: &str,
+        batch_size: usize,
         flushing_period: Duration,
         max_cached_counters: usize,
         response_timeout: Duration,
@@ -193,6 +196,7 @@ impl CachedRedisStorage {
                         storage.is_alive().await,
                         counters_cache_clone.clone(),
                         p.clone(),
+                        batch_size,
                     )
                     .await;
                 }
@@ -224,6 +228,7 @@ fn flip_partitioned(storage: &AtomicBool, partition: bool) -> bool {
 
 pub struct CachedRedisStorageBuilder {
     redis_url: String,
+    batch_size: usize,
     flushing_period: Duration,
     max_cached_counters: usize,
     response_timeout: Duration,
@@ -233,12 +238,18 @@ impl CachedRedisStorageBuilder {
     pub fn new(redis_url: &str) -> Self {
         Self {
             redis_url: redis_url.to_string(),
+            batch_size: DEFAULT_BATCH_SIZE,
             flushing_period: Duration::from_secs(DEFAULT_FLUSHING_PERIOD_SEC),
             max_cached_counters: DEFAULT_MAX_CACHED_COUNTERS,
             response_timeout: Duration::from_millis(DEFAULT_RESPONSE_TIMEOUT_MS),
         }
     }
 
+    pub fn batch_size(mut self, batch_size: usize) -> Self {
+        self.batch_size = batch_size;
+        self
+    }
+
     pub fn flushing_period(mut self, flushing_period: Duration) -> Self {
         self.flushing_period = flushing_period;
         self
@@ -257,6 +268,7 @@ impl CachedRedisStorageBuilder {
     pub async fn build(self) -> Result<CachedRedisStorage, RedisError> {
         CachedRedisStorage::new_with_options(
             &self.redis_url,
+            self.batch_size,
             self.flushing_period,
             self.max_cached_counters,
             self.response_timeout,
@@ -319,6 +331,7 @@ async fn flush_batcher_and_update_counters<C: ConnectionLike>(
     storage_is_alive: bool,
     cached_counters: Arc<CountersCache>,
     partitioned: Arc<AtomicBool>,
+    batch_size: usize,
 ) {
     if partitioned.load(Ordering::Acquire) || !storage_is_alive {
         if !cached_counters.batcher().is_empty() {
@@ -327,7 +340,9 @@ async fn flush_batcher_and_update_counters<C: ConnectionLike>(
     } else {
         let updated_counters = cached_counters
             .batcher()
-            .consume(100, |counters| update_counters(&mut redis_conn, counters))
+            .consume(batch_size, |counters| {
+                update_counters(&mut redis_conn, counters)
+            })
             .await
             .or_else(|err| {
                 if err.is_transient() {
@@ -486,8 +501,14 @@ mod tests {
             assert_eq!(c.hits(&counter), 2);
         }
 
-        flush_batcher_and_update_counters(mock_client, true, cached_counters.clone(), partitioned)
-            .await;
+        flush_batcher_and_update_counters(
+            mock_client,
+            true,
+            cached_counters.clone(),
+            partitioned,
+            100,
+        )
+        .await;
 
         if let Some(c) = cached_counters.get(&counter) {
             assert_eq!(c.hits(&counter), 8);