def getObjectKey(rpcObject):
    """Given a rpc object, get a unique key that in the form
    'class.id'
    @type rpcObject: grpc.Message
    @param rpcObject: Rpc object to get a key for
    @rtype: str
    @return:  String key in the form <class>.<id>
    """
    objectClass = rpcObject.__class__.__name__
    objectId = rpcObject.id()
    return "{}.{}".format(objectClass, objectId)