feat: add metrics (#17)

Signed-off-by: MrCroxx <[email protected]>

foyer/src/container.rs

@@ -16,6 +16,7 @@ use std::collections::BTreeMap;
 use std::hash::Hasher;
 
 use std::ptr::NonNull;
+use std::sync::Arc;
 
 use futures::future::try_join_all;
 use itertools::Itertools;
@@ -24,7 +25,7 @@ use twox_hash::XxHash64;
 
 use crate::policies::{Handle, Policy};
 use crate::store::Store;
-use crate::{Data, Index, WrappedNonNull};
+use crate::{Data, Index, Metrics, WrappedNonNull};
 
 // TODO(MrCroxx): wrap own result type
 use crate::store::error::Result;
@@ -73,6 +74,8 @@ where
 {
     pool_count_bits: usize,
     pools: Vec<Mutex<Pool<I, P, H, D, S>>>,
+
+    metrics: Arc<Metrics>,
 }
 
 impl<I, P, H, D, S> Container<I, P, H, D, S>
@@ -85,11 +88,20 @@ where
     S: Store<I = I, D = D>,
 {
     pub async fn open(config: Config<I, P, H, S>) -> Result<Self> {
+        Self::open_with_registry(config, prometheus::Registry::new()).await
+    }
+
+    pub async fn open_with_registry(
+        config: Config<I, P, H, S>,
+        registry: prometheus::Registry,
+    ) -> Result<Self> {
         let pool_count = 1 << config.pool_count_bits;
         let capacity = config.capacity >> config.pool_count_bits;
 
+        let metrics = Arc::new(Metrics::new(registry));
+
         let stores = (0..pool_count)
-            .map(|pool| S::open(pool, config.store_config.clone()))
+            .map(|pool| S::open(pool, config.store_config.clone(), metrics.clone()))
             .collect_vec();
         let stores = try_join_all(stores).await?;
 
@@ -103,17 +115,21 @@ where
                 size: 0,
                 handles: BTreeMap::new(),
                 store,
+                _metrics: metrics.clone(),
             })
             .map(Mutex::new)
             .collect_vec();
 
         Ok(Self {
             pool_count_bits: config.pool_count_bits,
             pools,
+            metrics,
         })
     }
 
     pub async fn insert(&self, index: I, data: D) -> Result<bool> {
+        let _timer = self.metrics.latency_insert.start_timer();
+
         let mut pool = self.pool(&index).await;
 
         if pool.handles.get(&index).is_some() {
@@ -131,6 +147,8 @@ where
     }
 
     pub async fn remove(&self, index: &I) -> Result<bool> {
+        let _timer = self.metrics.latency_remove.start_timer();
+
         let mut pool = self.pool(index).await;
 
         if pool.handles.get(index).is_none() {
@@ -144,9 +162,17 @@ where
     }
 
     pub async fn get(&self, index: &I) -> Result<Option<D>> {
+        let _timer = self.metrics.latency_get.start_timer();
+
         let mut pool = self.pool(index).await;
 
-        pool.get(index).await
+        let res = pool.get(index).await?;
+
+        if res.is_none() {
+            self.metrics.miss.inc();
+        }
+
+        Ok(res)
     }
 
     // TODO(MrCroxx): optimize this
@@ -186,6 +212,8 @@ where
     handles: BTreeMap<I, PoolHandle<I, H>>,
 
     store: S,
+
+    _metrics: Arc<Metrics>,
 }
 
 impl<I, P, H, D, S> Pool<I, P, H, D, S>

foyer/src/metrics.rs

@@ -13,15 +13,30 @@
 //  limitations under the License.
 
 use prometheus::{
-    register_counter_vec_with_registry, register_histogram_vec_with_registry,
-    register_int_counter_with_registry, CounterVec, HistogramVec, IntCounter, Registry,
+    register_counter_vec_with_registry, register_gauge_with_registry,
+    register_histogram_vec_with_registry, register_int_counter_with_registry, Counter, CounterVec,
+    Gauge, Histogram, HistogramVec, IntCounter, Registry,
 };
 
 pub struct Metrics {
+    pub latency_insert: Histogram,
+    pub latency_get: Histogram,
+    pub latency_remove: Histogram,
+
+    pub latency_store: Histogram,
+    pub latency_load: Histogram,
+    pub latency_delete: Histogram,
+
+    pub bytes_store: Counter,
+    pub bytes_load: Counter,
+    pub bytes_delete: Counter,
+
+    pub cache_data_size: Gauge,
+
     pub miss: IntCounter,
 
-    pub latency: HistogramVec,
-    pub bytes: CounterVec,
+    _latency: HistogramVec,
+    _bytes: CounterVec,
 }
 
 impl Default for Metrics {
@@ -32,10 +47,6 @@ impl Default for Metrics {
 
 impl Metrics {
     pub fn new(registry: Registry) -> Self {
-        let miss =
-            register_int_counter_with_registry!("foyer_cache_miss", "file cache miss", registry)
-                .unwrap();
-
         let latency = register_histogram_vec_with_registry!(
             "foyer_latency",
             "foyer latency",
@@ -52,10 +63,47 @@ impl Metrics {
             register_counter_vec_with_registry!("foyer_bytes", "foyer bytes", &["op"], registry)
                 .unwrap();
 
+        let latency_insert = latency.with_label_values(&["insert"]);
+        let latency_get = latency.with_label_values(&["get"]);
+        let latency_remove = latency.with_label_values(&["remove"]);
+
+        let latency_store = latency.with_label_values(&["store"]);
+        let latency_load = latency.with_label_values(&["load"]);
+        let latency_delete = latency.with_label_values(&["delete"]);
+
+        let bytes_store = bytes.with_label_values(&["store"]);
+        let bytes_load = bytes.with_label_values(&["load"]);
+        let bytes_delete = bytes.with_label_values(&["delete"]);
+
+        let miss =
+            register_int_counter_with_registry!("foyer_cache_miss", "foyer cache miss", registry)
+                .unwrap();
+        let cache_data_size = register_gauge_with_registry!(
+            "foyer_cache_data_size",
+            "foyer cache data size",
+            registry
+        )
+        .unwrap();
+
         Self {
+            latency_insert,
+            latency_get,
+            latency_remove,
+
+            latency_store,
+            latency_load,
+            latency_delete,
+
+            bytes_store,
+            bytes_load,
+            bytes_delete,
+
+            cache_data_size,
+
             miss,
-            latency,
-            bytes,
+
+            _latency: latency,
+            _bytes: bytes,
         }
     }
 }

foyer/src/store/mod.rs

@@ -17,7 +17,9 @@ pub mod error;
 pub mod file;
 pub mod read_only_file_store;
 
-use crate::{Data, Index};
+use std::sync::Arc;
+
+use crate::{Data, Index, Metrics};
 use async_trait::async_trait;
 
 use error::Result;
@@ -28,7 +30,7 @@ pub trait Store: Send + Sync + Sized + 'static {
     type D: Data;
     type C: Send + Sync + Clone + std::fmt::Debug + 'static;
 
-    async fn open(pool: usize, config: Self::C) -> Result<Self>;
+    async fn open(pool: usize, config: Self::C, metrics: Arc<Metrics>) -> Result<Self>;
 
     async fn store(&self, index: Self::I, data: Self::D) -> Result<()>;
 
@@ -81,7 +83,7 @@ pub mod tests {
 
         type C = ();
 
-        async fn open(_pool: usize, _: Self::C) -> Result<Self> {
+        async fn open(_pool: usize, _: Self::C, _metrics: Arc<Metrics>) -> Result<Self> {
             Ok(Self::new())
         }
 

foyer/src/store/read_only_file_store.rs

@@ -28,7 +28,7 @@ use itertools::Itertools;
 use rand::{thread_rng, Rng};
 use tokio::sync::{RwLock, RwLockWriteGuard};
 
-use crate::{Data, Index};
+use crate::{Data, Index, Metrics};
 
 use super::error::Result;
 use super::file::{AppendableFile, Location, ReadableFile, WritableFile};
@@ -102,6 +102,8 @@ where
 
     size: Arc<AtomicUsize>,
 
+    metrics: Arc<Metrics>,
+
     _marker: PhantomData<D>,
 }
 
@@ -117,6 +119,7 @@ where
             indices: Arc::clone(&self.indices),
             files: Arc::clone(&self.files),
             size: Arc::clone(&self.size),
+            metrics: Arc::clone(&self.metrics),
             _marker: PhantomData,
         }
     }
@@ -134,7 +137,7 @@ where
 
     type C = Config;
 
-    async fn open(pool: usize, mut config: Self::C) -> Result<Self> {
+    async fn open(pool: usize, mut config: Self::C, metrics: Arc<Metrics>) -> Result<Self> {
         config.dir = config.dir.join(format!("{:04}", pool));
 
         let ids = asyncify({
@@ -182,12 +185,15 @@ where
             indices: Arc::new(RwLock::new(indices)),
             files: Arc::new(RwLock::new(files)),
             size: Arc::new(AtomicUsize::new(size)),
+            metrics,
             _marker: PhantomData,
         })
     }
 
     #[allow(clippy::uninit_vec)]
     async fn store(&self, index: Self::I, data: Self::D) -> Result<()> {
+        let _timer = self.metrics.latency_store.start_timer();
+
         // append cache file and meta file
         let (fid, sid, location) = {
             // randomly drop if size exceeds the threshold
@@ -234,8 +240,13 @@ where
             drop(indices);
         }
 
-        self.size
-            .fetch_add(location.len as usize, Ordering::Relaxed);
+        let cache_data_size = self
+            .size
+            .fetch_add(location.len as usize, Ordering::Relaxed)
+            + location.len as usize;
+
+        self.metrics.bytes_store.inc_by(location.len as f64);
+        self.metrics.cache_data_size.set(cache_data_size as f64);
 
         if active_file_size >= self.config.max_file_size {
             let files = self.files.write().await;
@@ -251,6 +262,8 @@ where
     }
 
     async fn load(&self, index: &Self::I) -> Result<Option<Self::D>> {
+        let _timer = self.metrics.latency_load.start_timer();
+
         // TODO(MrCroxx): add bloom filters ?
         let (fid, _sid, location) = {
             let indices = self.indices.read().await;
@@ -283,12 +296,16 @@ where
             }
         };
 
+        self.metrics.bytes_load.inc_by(location.len as f64);
+
         self.maybe_trigger_reclaim().await?;
 
         Ok(Some(buf.into()))
     }
 
     async fn delete(&self, index: &Self::I) -> Result<()> {
+        let _timer = self.metrics.latency_delete.start_timer();
+
         let (fid, sid, location) = {
             let indices = self.indices.read().await;
             let (fid, sid, location) = match indices.get(index) {
@@ -318,8 +335,13 @@ where
             }
         }
 
-        self.size
-            .fetch_sub(location.len as usize, Ordering::Relaxed);
+        let cache_data_size = self
+            .size
+            .fetch_sub(location.len as usize, Ordering::Relaxed)
+            - location.len as usize;
+
+        self.metrics.bytes_delete.inc_by(location.len as f64);
+        self.metrics.cache_data_size.set(cache_data_size as f64);
 
         self.maybe_trigger_reclaim().await?;
 
@@ -376,7 +398,8 @@ where
             size as usize
         };
 
-        self.size.fetch_sub(size, Ordering::Relaxed);
+        let cache_data_size = self.size.fetch_sub(size, Ordering::Relaxed) - size;
+        self.metrics.cache_data_size.set(cache_data_size as f64);
 
         meta_file.reclaim().await?;
         cache_file.reclaim().await?;
@@ -520,7 +543,9 @@ mod tests {
         };
 
         let store: ReadOnlyFileStore<u64, Vec<u8>> =
-            ReadOnlyFileStore::open(0, config).await.unwrap();
+            ReadOnlyFileStore::open(0, config, Arc::new(Metrics::default()))
+                .await
+                .unwrap();
 
         store.store(1, data(1, 1024)).await.unwrap();
         assert_eq!(store.load(&1).await.unwrap(), Some(data(1, 1024)));
@@ -572,7 +597,9 @@ mod tests {
         };
 
         let store: ReadOnlyFileStore<u64, Vec<u8>> =
-            ReadOnlyFileStore::open(0, config.clone()).await.unwrap();
+            ReadOnlyFileStore::open(0, config.clone(), Arc::new(Metrics::default()))
+                .await
+                .unwrap();
 
         for i in 0..20 {
             store.store(i, data(i as u8, 1024)).await.unwrap();
@@ -589,7 +616,9 @@ mod tests {
         drop(store);
 
         let store: ReadOnlyFileStore<u64, Vec<u8>> =
-            ReadOnlyFileStore::open(0, config).await.unwrap();
+            ReadOnlyFileStore::open(0, config, Arc::new(Metrics::default()))
+                .await
+                .unwrap();
 
         assert_eq!(store.files.read().await.frozens.len(), 3);
         for i in 0..12 {