code: func (api *PrivateDebugAPI) ChaindbProperty(property string) (string, error) {
  	ldb, ok := api.b.ChainDb().(interface {
  		LDB() *leveldb.DB
  	})
  	if !ok {
  		return "", fmt.Errorf("chaindbProperty does not work for memory databases")
  	}
  	if property == "" {
  		property = "leveldb.stats"
  	} else if !strings.HasPrefix(property, "leveldb.") {
  		property = "leveldb." + property
  	}
  	return ldb.LDB().GetProperty(property)
  }
docs: // ChaindbProperty returns leveldb properties of the chain database.