def get_orderbook(self):
        """Get orderbook for the instrument

        :Retruns:
            orderbook : dict
                orderbook dict for the instrument
        """
        if self in self.parent.books.keys():
            return self.parent.books[self]

        return {
            "bid": [0], "bidsize": [0],
            "ask": [0], "asksize": [0]
        }
Get orderbook for the instrument

        :Retruns:
            orderbook : dict
                orderbook dict for the instrument