feat: added dispatcher lifecycle hooks

v1/core/dispatcher.go

@@ -51,6 +51,8 @@ type Dispatcher struct {
 	poller         Poller
 	fsmStorage     FSMStorage
 	eventIsolation EventIsolation
+	onStart        func(ctx context.Context) error
+	onStop         func(ctx context.Context) error
 	rt             *Router
 	logger         zerolog.Logger
 	wg             sync.WaitGroup
@@ -81,6 +83,7 @@ func NewDispatcher(api *maxbot.Api, options ...DispatcherOption) *Dispatcher {
 	d.poller = opts.poller
 	d.fsmStorage = opts.fsmStorage
 	d.eventIsolation = opts.eventIsolation
+	d.logger = opts.logger
 
 	return d
 }
@@ -107,13 +110,47 @@ func (d *Dispatcher) Start(ctx context.Context) error {
 		return err
 	}
 
+	if d.onStart != nil {
+		if err := d.onStart(ctx); err != nil {
+			return err
+		}
+	}
+
 	d.handleUpdates(ch)
-	d.wg.Wait()
 	return nil
 }
 
 func (d *Dispatcher) Stop(ctx context.Context) error {
-	return d.poller.Stop(ctx)
+	if err := d.poller.Stop(ctx); err != nil {
+		return err
+	}
+
+	done := make(chan struct{})
+
+	go func() {
+		d.wg.Wait()
+		done <- struct{}{}
+	}()
+
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case <-done:
+	}
+
+	if d.onStop != nil {
+		return d.onStop(ctx)
+	}
+
+	return nil
+}
+
+func (d *Dispatcher) OnStart(f func(ctx context.Context) error) {
+	d.onStart = f
+}
+
+func (d *Dispatcher) OnStop(f func(ctx context.Context) error) {
+	d.onStop = f
 }
 
 func (d *Dispatcher) handleUpdates(ch <-chan model.Update) {