Added timer loop exit feature.

Signed-off-by: Suneet Nangia <[email protected]>

examples/spin-timer/app-example/src/lib.rs

@@ -6,9 +6,12 @@ wit_bindgen::generate!({
 struct MySpinTimer;
 
 impl SpinTimer for MySpinTimer {
-    fn handle_timer_request() {
+    fn handle_timer_request() -> bool {
         let text = spin_sdk::config::get("message").unwrap();
         println!("{text}");
+
+        // Return false if you want to exit the timer loop calling this funtion subsequently.
+        true
     }
 }
 

examples/spin-timer/spin-timer.wit

@@ -1,3 +1,3 @@
 default world spin-timer {
-  export handle-timer-request: func()
+  export handle-timer-request: func() -> bool
 }

examples/spin-timer/src/main.rs

@@ -110,6 +110,15 @@ impl TriggerExecutor for TimerTrigger {
                         loop {
                             tokio::time::sleep(duration).await;
                             self.handle_timer_event(c).await.unwrap();
+
+                            // Inverse the control of breaking out of loop, let the component decide this by returning false.
+                            let exit = !self.handle_timer_event(c).await.unwrap();
+
+                            // Exit the loop if component asks for it.
+                            if exit 
+                            {
+                                break;
+                            }
                         }
                     });
                 }
@@ -120,7 +129,7 @@ impl TriggerExecutor for TimerTrigger {
 }
 
 impl TimerTrigger {
-    async fn handle_timer_event(&self, component_id: &str) -> anyhow::Result<()> {
+    async fn handle_timer_event(&self, component_id: &str) -> anyhow::Result<bool> {
         // Load the guest...
         let (instance, mut store) = self.engine.prepare_instance(component_id).await?;
         let EitherInstance::Component(instance) = instance else {