增加观测日志

src/rtr/cache/core.rs

@@ -651,6 +651,44 @@ pub enum SerialResult {
     ResetRequired,
 }
 
+#[derive(Debug, Clone, Copy)]
+pub struct CacheMemoryStats {
+    pub serials: [u32; VERSION_COUNT],
+    pub snapshot_payload_counts: [usize; VERSION_COUNT],
+    pub delta_lengths: [usize; VERSION_COUNT],
+    pub delta_payload_counts: [usize; VERSION_COUNT],
+    pub snapshot_arc_strong_counts: [usize; VERSION_COUNT],
+    pub rtr_payloads_arc_strong_counts: [usize; VERSION_COUNT],
+}
+
+impl RtrCache {
+    pub fn memory_stats(&self) -> CacheMemoryStats {
+        let snapshot_payload_counts =
+            std::array::from_fn(|idx| self.versions[idx].rtr_payloads.len());
+        let delta_lengths = std::array::from_fn(|idx| self.versions[idx].deltas.len());
+        let delta_payload_counts = std::array::from_fn(|idx| {
+            self.versions[idx]
+                .deltas
+                .iter()
+                .map(|delta| delta.announced().len() + delta.withdrawn().len())
+                .sum()
+        });
+        let snapshot_arc_strong_counts =
+            std::array::from_fn(|idx| Arc::strong_count(&self.versions[idx].snapshot));
+        let rtr_payloads_arc_strong_counts =
+            std::array::from_fn(|idx| Arc::strong_count(&self.versions[idx].rtr_payloads));
+
+        CacheMemoryStats {
+            serials: self.serials(),
+            snapshot_payload_counts,
+            delta_lengths,
+            delta_payload_counts,
+            snapshot_arc_strong_counts,
+            rtr_payloads_arc_strong_counts,
+        }
+    }
+}
+
 #[derive(Clone)]
 pub(super) struct AppliedUpdate {
     pub(super) availability: CacheAvailability,

src/rtr/cache/mod.rs

@@ -3,7 +3,9 @@ mod model;
 mod ordering;
 mod store;
 
-pub use core::{CacheAvailability, RtrCache, RtrCacheBuilder, SerialResult, SessionIds};
+pub use core::{
+    CacheAvailability, CacheMemoryStats, RtrCache, RtrCacheBuilder, SerialResult, SessionIds,
+};
 pub use model::{Delta, DualTime, Snapshot};
 pub use ordering::{
     OrderingViolation, validate_payload_update_refs_for_rtr, validate_payload_updates_for_rtr,

src/rtr/server/notifier.rs

@@ -13,4 +13,8 @@ impl RtrNotifier {
     pub fn notify_cache_updated(&self) -> usize {
         self.tx.send(()).unwrap_or_default()
     }
+
+    pub fn listener_count(&self) -> usize {
+        self.tx.receiver_count()
+    }
 }