contract.py 文件源码

def receive(msgpack_string, contract_digest=None):
        """Unpack a msgpack string into the appropriate Contract type.
        If `contract_digest` is set, only returns the Response/Failure
        if its digest matches the `contract_digest`, and returns False if it
        doesn't.
        """
        payload = msgpack.unpackb(msgpack_string)
        if payload[0] == Contract.CONTRACT_REQUEST:
            contract = Request.load(payload)
        elif payload[0] == Contract.CONTRACT_RESPONSE:
            contract = Response.load(payload)
        elif payload[0] == Contract.CONTRACT_FAILURE:
            contract = Failure.load(payload)

        if contract_digest is not None and not isinstance(contract, Request):
            if contract.request_digest == contract_digest:
                return contract
            else:
                return False

        return contract