[service] Run event callbacks asynchronously

service/mgr/events.go

@@ -2,7 +2,6 @@
 package mgr
 
 import (
-	"fmt"
 	"slices"
 	"sync"
 	"sync/atomic"
@@ -107,36 +106,51 @@ func (em *EventMgr[T]) Submit(event T) {
 
 	// Run callbacks.
 	for _, ec := range em.callbacks {
+		// Check if callback was canceled.
+		if ec.canceled.Load() {
+			anyCanceled = true
+			continue
+		}
+
 		// Execute callback.
 		var (
 			cancel bool
 			err    error
 		)
 		if em.mgr != nil {
 			// Prefer executing in worker.
-			wkrErr := em.mgr.Do("execute event callback", func(w *WorkerCtx) error {
-				cancel, err = ec.callback(w, event) //nolint:scopelint // Execution is within scope.
+			name := "event " + em.name + " callback " + ec.name
+			em.mgr.Go(name, func(w *WorkerCtx) error {
+				cancel, err = ec.callback(w, event)
+				// Handle error and cancelation.
+				if err != nil {
+					w.Warn(
+						"event callback failed",
+						"event", em.name,
+						"callback", ec.name,
+						"err", err,
+					)
+				}
+				if cancel {
+					ec.canceled.Store(true)
+				}
 				return nil
 			})
-			if wkrErr != nil {
-				err = fmt.Errorf("callback execution failed: %w", wkrErr)
-			}
 		} else {
 			cancel, err = ec.callback(nil, event)
-		}
-
-		// Handle error and cancelation.
-		if err != nil && em.mgr != nil {
-			em.mgr.Warn(
-				"event callback failed",
-				"event", em.name,
-				"callback", ec.name,
-				"err", err,
-			)
-		}
-		if cancel {
-			ec.canceled.Store(true)
-			anyCanceled = true
+			// Handle error and cancelation.
+			if err != nil && em.mgr != nil {
+				em.mgr.Warn(
+					"event callback failed",
+					"event", em.name,
+					"callback", ec.name,
+					"err", err,
+				)
+			}
+			if cancel {
+				ec.canceled.Store(true)
+				anyCanceled = true
+			}
 		}
 	}