Method getListFromDB

structure/list.go:574–609

getListFromDB retrieves data from the database. When isKeyCanNotExist is true, it returns an empty slice if the key doesn't exist instead of an error.

(key string, isKeyCanNotExist bool)

// getListFromDB retrieves data from the database. When isKeyCanNotExist is true, it returns an empty slice if the key doesn't exist instead of an error.
func (l *ListStructure) getListFromDB(key string, isKeyCanNotExist bool) (*list, int64, error) {
	if isKeyCanNotExist {
		// Get data corresponding to the key from the database
		dbData, err := l.db.Get([]byte(key))

		// Since the key might not exist, we need to handle ErrKeyNotFound separately as it is a valid case
		if err != nil && err != _const.ErrKeyNotFound {
			return nil, 0, err
		}

		// Deserialize the data into a DecodedList
		decodedList, err := l.decodeList(dbData)
		if err != nil {
			if len(dbData) != 0 {
				return nil, 0, err
			} else {
				decodedList = &DecodedList{List: &list{nil, 0}, Expiration: 0}
			}
		}
		return decodedList.List, decodedList.Expiration, nil
	} else {
		// Get data corresponding to the key from the database
		dbData, err := l.db.Get([]byte(key))
		if err != nil {
			return nil, 0, err
		}

		// Deserialize the data into a DecodedList
		decodedList, err := l.decodeList(dbData)
		if err != nil {
			return nil, 0, err
		}

		return decodedList.List, decodedList.Expiration, nil
	}
}

// setListToDB stores the data into the database.
func (l *ListStructure) setListToDB(key string, lst *list, ttl time.Duration) error {