feat: add FinalizeNats function; chore: add checks for non-nil connections before close

nacl.go

@@ -17,6 +17,7 @@ type (
 	Msg              = stan.Msg
 	NatsMsg          = nats.Msg
 	Subscription     = stan.Subscription
+	NatsSubscription = nats.Subscription
 )
 
 func SetupNats(host string, port int, user string, pass string, closeHandler *grawt.CloseHandler) error {
@@ -64,6 +65,9 @@ func SetupStan(clusterName string, clientId string, host string, port int, user
 }
 
 func FinalizeStan(subscriptions *[]Subscription) error {
+	if StanClient == nil {
+		return fmt.Errorf("stan client is not initialized")
+	}
 	for _, subscription := range *subscriptions {
 		_ = subscription.Unsubscribe()
 	}
@@ -74,3 +78,16 @@ func FinalizeStan(subscriptions *[]Subscription) error {
 
 	return nil
 }
+
+func FinalizeNats(subscriptions *[]*NatsSubscription) error {
+	if StanClient == nil {
+		return fmt.Errorf("stan client is not initialized")
+	}
+	for _, subscription := range *subscriptions {
+		_ = subscription.Unsubscribe()
+	}
+
+	NatsClient.Close()
+
+	return nil
+}