fix: remove unused fields and ensure push notifications work in cloned clients

- Remove unused Timestamp and Source fields from PushNotificationInfo
- Add pushProcessor to newConn function to ensure Conn instances have push notifications
- Add push notification methods to Conn type for consistency
- Ensure cloned clients and Conn instances preserve push notification functionality

This fixes issues where:
1. PushNotificationInfo had unused fields causing confusion
2. Conn instances created via client.Conn() lacked push notification support
3. All client types now consistently support push notifications

Author: ndyakov

push_notifications.go

@@ -225,10 +225,8 @@ const (
 
 // PushNotificationInfo contains metadata about a push notification.
 type PushNotificationInfo struct {
-	Command   string
-	Args      []interface{}
-	Timestamp int64
-	Source    string
+	Command string
+	Args    []interface{}
 }
 
 // ParsePushNotificationInfo extracts information from a push notification.

redis.go

@@ -982,6 +982,11 @@ func newConn(opt *Options, connPool pool.Pooler, parentHooks *hooksMixin) *Conn
 		c.hooksMixin = parentHooks.clone()
 	}
 
+	// Set push notification processor if available in options
+	if opt.PushNotificationProcessor != nil {
+		c.pushProcessor = opt.PushNotificationProcessor
+	}
+
 	c.cmdable = c.Process
 	c.statefulCmdable = c.Process
 	c.initHooks(hooks{
@@ -1000,6 +1005,29 @@ func (c *Conn) Process(ctx context.Context, cmd Cmder) error {
 	return err
 }
 
+// RegisterPushNotificationHandler registers a handler for a specific push notification command.
+// Returns an error if a handler is already registered for this command.
+func (c *Conn) RegisterPushNotificationHandler(command string, handler PushNotificationHandler) error {
+	if c.pushProcessor != nil {
+		return c.pushProcessor.RegisterHandler(command, handler)
+	}
+	return nil
+}
+
+// RegisterPushNotificationHandlerFunc registers a function as a handler for a specific push notification command.
+// Returns an error if a handler is already registered for this command.
+func (c *Conn) RegisterPushNotificationHandlerFunc(command string, handlerFunc func(ctx context.Context, notification []interface{}) bool) error {
+	if c.pushProcessor != nil {
+		return c.pushProcessor.RegisterHandlerFunc(command, handlerFunc)
+	}
+	return nil
+}
+
+// GetPushNotificationProcessor returns the push notification processor.
+func (c *Conn) GetPushNotificationProcessor() *PushNotificationProcessor {
+	return c.pushProcessor
+}
+
 func (c *Conn) Pipelined(ctx context.Context, fn func(Pipeliner) error) ([]Cmder, error) {
 	return c.Pipeline().Pipelined(ctx, fn)
 }