fix(rivetkit-core): decrement active actor metrics

Author: NathanFlurry

rivetkit-rust/packages/rivetkit-core/src/actor/context.rs

@@ -1364,58 +1364,71 @@ impl ActorContext {
 	}
 
 	fn configure_sleep_hooks(&self) {
-		let keep_awake_ctx = self.clone();
+		let keep_awake_ctx = self.downgrade();
 		self.0
 			.sleep
 			.work
 			.keep_awake
 			.register_change_callback(Arc::new(move || {
-				keep_awake_ctx
-					.0
-					.metrics
-					.set_keep_awake_active(keep_awake_ctx.sleep_keep_awake_count());
+				if let Some(ctx) = ActorContext::from_weak(&keep_awake_ctx) {
+					ctx.0
+						.metrics
+						.set_keep_awake_active(ctx.sleep_keep_awake_count());
+				}
 			}));
 
-		let internal_keep_awake_metric_ctx = self.clone();
+		let internal_keep_awake_metric_ctx = self.downgrade();
 		self.0
 			.sleep
 			.work
 			.internal_keep_awake
 			.register_change_callback(Arc::new(move || {
-				internal_keep_awake_metric_ctx
-					.0
-					.metrics
-					.set_internal_keep_awake_active(
-						internal_keep_awake_metric_ctx.sleep_internal_keep_awake_count(),
-					);
+				if let Some(ctx) = ActorContext::from_weak(&internal_keep_awake_metric_ctx) {
+					ctx.0
+						.metrics
+						.set_internal_keep_awake_active(ctx.sleep_internal_keep_awake_count());
+				}
 			}));
 
-		let shutdown_tasks_ctx = self.clone();
+		let shutdown_tasks_ctx = self.downgrade();
 		self.0
 			.sleep
 			.work
 			.shutdown_counter
 			.register_change_callback(Arc::new(move || {
-				shutdown_tasks_ctx
-					.0
-					.metrics
-					.set_shutdown_tasks_active(shutdown_tasks_ctx.shutdown_task_count());
+				if let Some(ctx) = ActorContext::from_weak(&shutdown_tasks_ctx) {
+					ctx.0
+						.metrics
+						.set_shutdown_tasks_active(ctx.shutdown_task_count());
+				}
 			}));
 
-		let internal_keep_awake_ctx = self.clone();
+		let internal_keep_awake_ctx = self.downgrade();
 		self.set_internal_keep_awake(Some(Arc::new(move |future| {
-			let ctx = internal_keep_awake_ctx.clone();
-			Box::pin(async move { ctx.internal_keep_awake_task(future).await })
+			let ctx = ActorContext::from_weak(&internal_keep_awake_ctx);
+			Box::pin(async move {
+				let Some(ctx) = ctx else {
+					return Err(ActorRuntime::NotConfigured {
+						component: "actor context".to_owned(),
+					}
+					.build());
+				};
+				ctx.internal_keep_awake_task(future).await
+			})
 		})));
 
-		let queue_ctx = self.clone();
+		let queue_ctx = self.downgrade();
 		self.set_wait_activity_callback(Some(Arc::new(move || {
-			queue_ctx.reset_sleep_timer();
+			if let Some(ctx) = ActorContext::from_weak(&queue_ctx) {
+				ctx.reset_sleep_timer();
+			}
 		})));
 
-		let queue_ctx = self.clone();
+		let queue_ctx = self.downgrade();
 		self.set_inspector_update_callback(Some(Arc::new(move |queue_size| {
-			queue_ctx.record_queue_updated(queue_size);
+			if let Some(ctx) = ActorContext::from_weak(&queue_ctx) {
+				ctx.record_queue_updated(queue_size);
+			}
 		})));
 	}
 

rivetkit-rust/packages/rivetkit-core/src/actor/metrics.rs

@@ -1,6 +1,7 @@
 use std::collections::BTreeMap;
 use std::fmt;
 use std::sync::{Arc, LazyLock};
+use std::sync::atomic::{AtomicBool, Ordering};
 use std::time::Duration;
 
 use parking_lot::Mutex;
@@ -34,6 +35,7 @@ pub(crate) struct ActorMetrics {
 struct ActorMetricInner {
 	labels: ActorMetricLabels,
 	state: Mutex<ActorMetricState>,
+	active: AtomicBool,
 }
 
 #[derive(Debug)]
@@ -643,6 +645,7 @@ impl ActorMetrics {
 			inner: Arc::new(ActorMetricInner {
 				labels,
 				state: Mutex::new(ActorMetricState::default()),
+				active: AtomicBool::new(true),
 			}),
 		}
 	}
@@ -850,10 +853,24 @@ impl ActorMetrics {
 			.with_label_values(&[labels[0], subsystem, operation])
 			.inc();
 	}
+
+	pub(crate) fn record_actor_stopped(&self) {
+		self.inner.record_actor_stopped();
+	}
 }
 
 impl Drop for ActorMetricInner {
 	fn drop(&mut self) {
+		self.record_actor_stopped();
+	}
+}
+
+impl ActorMetricInner {
+	fn record_actor_stopped(&self) {
+		if !self.active.swap(false, Ordering::AcqRel) {
+			return;
+		}
+
 		self.clear_aggregated_gauges();
 		let metrics = &*METRICS;
 		metrics
@@ -865,9 +882,7 @@ impl Drop for ActorMetricInner {
 			.with_label_values(&self.labels.as_label_values())
 			.inc();
 	}
-}
 
-impl ActorMetricInner {
 	fn clear_aggregated_gauges(&self) {
 		let labels = self.labels.as_label_values();
 		let mut state = self.state.lock();

rivetkit-rust/packages/rivetkit-core/src/actor/task.rs

@@ -387,11 +387,13 @@ impl ActorTask {
 			Arc::clone(&inspector_attach_count),
 			inspector_overlay_tx.clone(),
 		);
-		let inspector_ctx = ctx.clone();
+		let inspector_ctx = ctx.downgrade();
 		let inspector_attach_count_for_hook = Arc::clone(&inspector_attach_count);
 		ctx.on_request_save(Box::new(move |_opts| {
 			if inspector_attach_count_for_hook.load(Ordering::SeqCst) > 0 {
-				inspector_ctx.notify_inspector_serialize_requested();
+				if let Some(ctx) = ActorContext::from_weak(&inspector_ctx) {
+					ctx.notify_inspector_serialize_requested();
+				}
 			}
 		}));
 		Self {
@@ -444,6 +446,7 @@ impl ActorTask {
 		let exit = self.run_live().await;
 		let LiveExit::Shutdown { reason } = exit else {
 			self.record_inbox_depths();
+			self.ctx.metrics().record_actor_stopped();
 			return Ok(());
 		};
 
@@ -457,6 +460,7 @@ impl ActorTask {
 		self.deliver_shutdown_reply(reason, &result);
 		self.transition_to(LifecycleState::Terminated);
 		self.record_inbox_depths();
+		self.ctx.metrics().record_actor_stopped();
 		result
 	}
 

rivetkit-rust/packages/rivetkit-core/tests/task.rs

@@ -174,6 +174,18 @@ mod moved_tests {
 		)
 	}
 
+	#[test]
+	fn request_save_hook_does_not_retain_actor_context() {
+		let ctx = ActorContext::new("actor-hook-drop", "task-hook-drop", Vec::new(), "local");
+		let weak = ctx.downgrade();
+		let task = new_task(ctx.clone());
+
+		drop(task);
+		drop(ctx);
+
+		assert!(weak.upgrade().is_none());
+	}
+
 	struct IdleEnvoyCallbacks;
 
 	impl EnvoyCallbacks for IdleEnvoyCallbacks {