fixed not expire messages cache after follow user

internal/servants/web/events.go

@@ -33,6 +33,7 @@ const (
 const (
 	_messageActionCreate uint8 = iota
 	_messageActionRead
+	_messageActionFollow
 )
 
 type cacheUnreadMsgEvent struct {
@@ -200,7 +201,8 @@ func (e *messageActionEvent) Action() (err error) {
 		case _messageActionRead:
 			// 清除未读消息数缓存，不需要处理错误
 			e.wc.DelUnreadMsgCountResp(userId)
-		case _messageActionCreate:
+		case _messageActionCreate,
+			_messageActionFollow:
 			fallthrough
 		default:
 			// TODO

internal/servants/web/followship.go

@@ -104,6 +104,7 @@ func (s *followshipSrv) FollowUser(r *web.FollowUserReq) mir.Error {
 	// 触发缓存更新事件
 	cache.OnCacheMyFollowIdsEvent(s.Ds, r.User.ID)
 	cache.OnExpireIndexTweetEvent(r.User.ID)
+	onMessageActionEvent(_messageActionFollow, r.User.ID)
 	return nil
 }