add player package with key client-side player functionality, update protocol codecs, and refactor metadata definitions and slot usage

pkg/client/event.go

@@ -0,0 +1,70 @@
+package client
+
+import (
+	"sync"
+)
+
+// EventHandler 是一個泛型事件總線
+type EventHandler struct {
+	mu       sync.RWMutex
+	handlers map[string][]func(event any) error
+}
+
+func (e *EventHandler) PublishEvent(event string, data any) error {
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+	if hs, ok := e.handlers[event]; ok {
+		for _, h := range hs {
+			if err := h(data); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func (e *EventHandler) SubscribeEvent(event string, handler func(data any) error) {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+	e.handlers[event] = append(e.handlers[event], handler)
+}
+
+func NewEventHandler() *EventHandler {
+	return &EventHandler{
+		handlers: make(map[string][]func(any) error),
+	}
+}
+
+//func SubscribeEvent[T bot.Event[T]](eb *EventHandler, t T, f func(event T) error) {
+//	eb.mu.Lock()
+//	defer eb.mu.Unlock()
+//
+//	eb.handlers[t.ID()] = append(eb.handlers[t.ID()], func(d any) error {
+//		t2 := d.(T)
+//		return f(t2)
+//	})
+//}
+//
+//func PublishEvent[T bot.Event[T]](eb *EventHandler, t T) error {
+//	eb.mu.RLock()
+//	defer eb.mu.RUnlock()
+//	if hs, ok := eb.handlers[t.ID()]; ok {
+//		for _, h := range hs {
+//			if err := h(t); err != nil {
+//				return err
+//			}
+//		}
+//	}
+//
+//	return nil
+//}
+//
+//func GoPublishEvent[T bot.Event[T]](eb *EventHandler, t T) {
+//	eb.mu.RLock()
+//	defer eb.mu.RUnlock()
+//	if hs, ok := eb.handlers[t.ID()]; ok {
+//		for _, h := range hs {
+//			go h(t)
+//		}
+//	}
+//}