his

type Exist interface {
	IsExist(key string) (bool, error)     //key是否存在
	Add(key string)                       //添加存在
	Del(key string)                       //移除存在
	Count() (sum int, err error)          //一共有多少个key
	GetAllKey() (all []string, err error) //返回所有的key
}

type KeyValue interface {
	Set(key string, value string)
	Get(key string) (value string, err error)
	Del(key string)
}

type Limit interface {
	Add(key string, delta int)                                //记录量自增
	Sub(key string, delta int)                                //记录量自减
	Get(key string) (cur int, e error)                        //获取当前量
	Reset(key string) (cur int, e error)                      //重置为0
	IsToLimit(key string, max int) (b bool, cur int, e error) //是否达上限值
}