Introduce metered container

linera-views/Cargo.toml

@@ -27,6 +27,7 @@ async-graphql = { workspace = true }
 async-lock = { workspace = true }
 async-trait = { workspace = true }
 bcs = { workspace = true }
+convert_case = { workspace = true }
 futures = { workspace = true }
 generic-array = { workspace = true }
 hex = { workspace = true, optional = true }

linera-views/src/dynamo_db.rs

@@ -40,6 +40,11 @@ use linera_base::ensure;
 use std::{collections::HashMap, env, str::FromStr, sync::Arc};
 use thiserror::Error;
 
+#[cfg(feature = "metrics")]
+use crate::metering::{
+    MeteredStore, DYNAMO_DB_METRICS, LRU_CACHING_METRICS, VALUE_SPLITTING_METRICS,
+};
+
 #[cfg(any(test, feature = "test"))]
 use {
     crate::lru_caching::TEST_CACHE_SIZE,
@@ -944,7 +949,17 @@ impl DirectKeyValueStore for DynamoDbStoreInternal {
 
 /// A shared DB client for DynamoDb implementing LruCaching
 #[derive(Clone)]
+#[allow(clippy::type_complexity)]
 pub struct DynamoDbStore {
+    #[cfg(feature = "metrics")]
+    store: MeteredStore<
+        LruCachingStore<
+            MeteredStore<
+                ValueSplittingStore<MeteredStore<JournalingKeyValueStore<DynamoDbStoreInternal>>>,
+            >,
+        >,
+    >,
+    #[cfg(not(feature = "metrics"))]
     store: LruCachingStore<ValueSplittingStore<JournalingKeyValueStore<DynamoDbStoreInternal>>>,
 }
 
@@ -1007,6 +1022,29 @@ impl KeyValueStore for DynamoDbStore {
 }
 
 impl DynamoDbStore {
+    #[cfg(not(feature = "metrics"))]
+    fn get_complete_store(
+        store: JournalingKeyValueStore<DynamoDbStoreInternal>,
+        cache_size: usize,
+    ) -> Self {
+        let store = ValueSplittingStore::new(store);
+        let store = LruCachingStore::new(store, cache_size);
+        Self { store }
+    }
+
+    #[cfg(feature = "metrics")]
+    fn get_complete_store(
+        store: JournalingKeyValueStore<DynamoDbStoreInternal>,
+        cache_size: usize,
+    ) -> Self {
+        let store = MeteredStore::new(&DYNAMO_DB_METRICS, store);
+        let store = ValueSplittingStore::new(store);
+        let store = MeteredStore::new(&VALUE_SPLITTING_METRICS, store);
+        let store = LruCachingStore::new(store, cache_size);
+        let store = MeteredStore::new(&LRU_CACHING_METRICS, store);
+        Self { store }
+    }
+
     /// Creates a `DynamoDbStore` from scratch with an LRU cache
     #[cfg(any(test, feature = "test"))]
     pub async fn new_for_testing(
@@ -1016,9 +1054,7 @@ impl DynamoDbStore {
         let (simple_store, table_status) =
             DynamoDbStoreInternal::new_for_testing(store_config).await?;
         let store = JournalingKeyValueStore::new(simple_store);
-        let store = ValueSplittingStore::new(store);
-        let store = LruCachingStore::new(store, cache_size);
-        let store = Self { store };
+        let store = Self::get_complete_store(store, cache_size);
         Ok((store, table_status))
     }
 
@@ -1029,9 +1065,7 @@ impl DynamoDbStore {
         let cache_size = store_config.common_config.cache_size;
         let simple_store = DynamoDbStoreInternal::initialize(store_config).await?;
         let store = JournalingKeyValueStore::new(simple_store);
-        let store = ValueSplittingStore::new(store);
-        let store = LruCachingStore::new(store, cache_size);
-        let store = Self { store };
+        let store = Self::get_complete_store(store, cache_size);
         Ok(store)
     }
 
@@ -1068,9 +1102,7 @@ impl DynamoDbStore {
         let cache_size = store_config.common_config.cache_size;
         let (simple_store, table_name) = DynamoDbStoreInternal::new(store_config).await?;
         let store = JournalingKeyValueStore::new(simple_store);
-        let store = ValueSplittingStore::new(store);
-        let store = LruCachingStore::new(store, cache_size);
-        let store = Self { store };
+        let store = Self::get_complete_store(store, cache_size);
         Ok((store, table_name))
     }
 }

linera-views/src/lib.rs

@@ -62,6 +62,10 @@ pub mod common;
 /// The code to turn a `DirectKeyValueStore` into a `KeyValueStore` by adding journaling.
 pub mod journaling;
 
+/// The code for encapsulating one key_value store into another that does metric
+#[cfg(feature = "metrics")]
+pub mod metering;
+
 /// The code for handling big values by splitting them into several small ones.
 pub mod value_splitting;
 

linera-views/src/metering.rs

@@ -0,0 +1,215 @@
+// Copyright (c) Zefchain Labs, Inc.
+// SPDX-License-Identifier: Apache-2.0
+
+use crate::{
+    batch::Batch,
+    common::{KeyValueStore, ReadableKeyValueStore, WritableKeyValueStore},
+};
+use async_trait::async_trait;
+use convert_case::{Case, Casing};
+use linera_base::sync::Lazy;
+use prometheus::{register_histogram_vec, HistogramVec};
+use std::{future::Future, time::Instant};
+
+#[derive(Clone)]
+/// The implementation of the `KeyValueStoreMetrics` for the `KeyValueStore`.
+pub struct KeyValueStoreMetrics {
+    read_value_bytes: HistogramVec,
+    contains_key: HistogramVec,
+    read_multi_values_bytes: HistogramVec,
+    find_keys_by_prefix: HistogramVec,
+    find_key_values_by_prefix: HistogramVec,
+    write_batch: HistogramVec,
+    clear_journal: HistogramVec,
+}
+
+/// The metrics for the "rocks db"
+#[cfg(feature = "rocksdb")]
+pub static ROCKS_DB_METRICS: Lazy<KeyValueStoreMetrics> =
+    Lazy::new(|| KeyValueStoreMetrics::new("rocks db internal".to_string()));
+
+/// The metrics for the "dynamo db"
+#[cfg(feature = "aws")]
+pub static DYNAMO_DB_METRICS: Lazy<KeyValueStoreMetrics> =
+    Lazy::new(|| KeyValueStoreMetrics::new("dynamo db internal".to_string()));
+
+/// The metrics for the "scylla db"
+#[cfg(feature = "scylladb")]
+pub static SCYLLA_DB_METRICS: Lazy<KeyValueStoreMetrics> =
+    Lazy::new(|| KeyValueStoreMetrics::new("scylla db internal".to_string()));
+
+/// The metrics for the "scylla db"
+#[cfg(any(feature = "rocksdb", feature = "aws"))]
+pub static VALUE_SPLITTING_METRICS: Lazy<KeyValueStoreMetrics> =
+    Lazy::new(|| KeyValueStoreMetrics::new("value splitting".to_string()));
+
+/// The metrics for the "lru caching"
+#[cfg(any(feature = "rocksdb", feature = "aws", feature = "scylladb"))]
+pub static LRU_CACHING_METRICS: Lazy<KeyValueStoreMetrics> =
+    Lazy::new(|| KeyValueStoreMetrics::new("lru caching".to_string()));
+
+impl KeyValueStoreMetrics {
+    /// Creation of a named Metered counter.
+    pub fn new(name: String) -> Self {
+        // name can be "rocks db". Then var_name = "rocks_db" and title_name = "RocksDb"
+        let var_name = name.replace(' ', "_");
+        let title_name = name.to_case(Case::Snake);
+
+        let read_value1 = format!("{}_read_value_bytes", var_name);
+        let read_value2 = format!("{} read value bytes", title_name);
+        let read_value_bytes = register_histogram_vec!(read_value1, read_value2, &[])
+            .expect("Counter creation should not fail");
+
+        let contains_key1 = format!("{}_contains_key", var_name);
+        let contains_key2 = format!("{} contains key", title_name);
+        let contains_key = register_histogram_vec!(contains_key1, contains_key2, &[])
+            .expect("Counter creation should not fail");
+
+        let read_multi_values1 = format!("{}_read_multi_value_bytes", var_name);
+        let read_multi_values2 = format!("{} read multi value bytes", title_name);
+        let read_multi_values_bytes =
+            register_histogram_vec!(read_multi_values1, read_multi_values2, &[])
+                .expect("Counter creation should not fail");
+
+        let find_keys1 = format!("{}_find_keys_by_prefix", var_name);
+        let find_keys2 = format!("{} find keys by prefix", title_name);
+        let find_keys_by_prefix = register_histogram_vec!(find_keys1, find_keys2, &[])
+            .expect("Counter creation should not fail");
+
+        let find_key_values1 = format!("{}_find_key_values_by_prefix", var_name);
+        let find_key_values2 = format!("{} find key values by prefix", title_name);
+        let find_key_values_by_prefix =
+            register_histogram_vec!(find_key_values1, find_key_values2, &[])
+                .expect("Counter creation should not fail");
+
+        let write_batch1 = format!("{}_write_batch", var_name);
+        let write_batch2 = format!("{} write batch", title_name);
+        let write_batch = register_histogram_vec!(write_batch1, write_batch2, &[])
+            .expect("Counter creation should not fail");
+
+        let clear_journal1 = format!("{}_clear_journal", var_name);
+        let clear_journal2 = format!("{} clear journal", title_name);
+        let clear_journal = register_histogram_vec!(clear_journal1, clear_journal2, &[])
+            .expect("Counter creation should not fail");
+
+        KeyValueStoreMetrics {
+            read_value_bytes,
+            contains_key,
+            read_multi_values_bytes,
+            find_keys_by_prefix,
+            find_key_values_by_prefix,
+            write_batch,
+            clear_journal,
+        }
+    }
+}
+
+/// A metered wrapper that keeps track of every operation
+#[derive(Clone)]
+pub struct MeteredStore<K> {
+    /// the metrics being stored
+    counter: &'static Lazy<KeyValueStoreMetrics>,
+    /// The underlying store of the metered store
+    pub store: K,
+}
+
+async fn run_with_execution_time_metric<F, O>(f: F, hist: &HistogramVec) -> O
+where
+    F: Future<Output = O>,
+{
+    let start = Instant::now();
+    let out = f.await;
+    let duration = start.elapsed();
+    hist.with_label_values(&[])
+        .observe(duration.as_micros() as f64);
+    out
+}
+
+#[async_trait]
+impl<K, E> ReadableKeyValueStore<E> for MeteredStore<K>
+where
+    K: ReadableKeyValueStore<E> + Send + Sync,
+{
+    const MAX_KEY_SIZE: usize = K::MAX_KEY_SIZE;
+    type Keys = K::Keys;
+    type KeyValues = K::KeyValues;
+
+    fn max_stream_queries(&self) -> usize {
+        self.store.max_stream_queries()
+    }
+
+    async fn read_value_bytes(&self, key: &[u8]) -> Result<Option<Vec<u8>>, E> {
+        run_with_execution_time_metric(
+            self.store.read_value_bytes(key),
+            &self.counter.read_value_bytes,
+        )
+        .await
+    }
+
+    async fn contains_key(&self, key: &[u8]) -> Result<bool, E> {
+        run_with_execution_time_metric(self.store.contains_key(key), &self.counter.contains_key)
+            .await
+    }
+
+    async fn read_multi_values_bytes(&self, keys: Vec<Vec<u8>>) -> Result<Vec<Option<Vec<u8>>>, E> {
+        run_with_execution_time_metric(
+            self.store.read_multi_values_bytes(keys),
+            &self.counter.read_multi_values_bytes,
+        )
+        .await
+    }
+
+    async fn find_keys_by_prefix(&self, key_prefix: &[u8]) -> Result<Self::Keys, E> {
+        run_with_execution_time_metric(
+            self.store.find_keys_by_prefix(key_prefix),
+            &self.counter.find_keys_by_prefix,
+        )
+        .await
+    }
+
+    async fn find_key_values_by_prefix(&self, key_prefix: &[u8]) -> Result<Self::KeyValues, E> {
+        run_with_execution_time_metric(
+            self.store.find_key_values_by_prefix(key_prefix),
+            &self.counter.find_key_values_by_prefix,
+        )
+        .await
+    }
+}
+
+#[async_trait]
+impl<K, E> WritableKeyValueStore<E> for MeteredStore<K>
+where
+    K: WritableKeyValueStore<E> + Send + Sync,
+{
+    const MAX_VALUE_SIZE: usize = K::MAX_VALUE_SIZE;
+
+    async fn write_batch(&self, batch: Batch, base_key: &[u8]) -> Result<(), E> {
+        run_with_execution_time_metric(
+            self.store.write_batch(batch, base_key),
+            &self.counter.write_batch,
+        )
+        .await
+    }
+
+    async fn clear_journal(&self, base_key: &[u8]) -> Result<(), E> {
+        run_with_execution_time_metric(
+            self.store.clear_journal(base_key),
+            &self.counter.clear_journal,
+        )
+        .await
+    }
+}
+
+impl<K> KeyValueStore for MeteredStore<K>
+where
+    K: KeyValueStore + Send + Sync,
+{
+    type Error = K::Error;
+}
+
+impl<K> MeteredStore<K> {
+    /// Creates a new Metered store
+    pub fn new(counter: &'static Lazy<KeyValueStoreMetrics>, store: K) -> Self {
+        Self { counter, store }
+    }
+}