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OpenStack Study: cliutils.py**** CubicPower OpenStack Study ****
# vim: tabstop=4 shiftwidth=4 softtabstop=4 # Copyright 2012 Red Hat, Inc. # # Licensed under the Apache License, Version 2.0 (the "License"); you may # not use this file except in compliance with the License. You may obtain # a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, WITHOUT # WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the # License for the specific language governing permissions and limitations # under the License. import inspect
**** CubicPower OpenStack Study **** class MissingArgs(Exception):
**** CubicPower OpenStack Study **** def __init__(self, missing): self.missing = missing
**** CubicPower OpenStack Study **** def __str__(self): if len(self.missing) == 1: return "An argument is missing" else: return ("%(num)d arguments are missing" % dict(num=len(self.missing))) def validate_args(fn, *args, **kwargs): """Check that the supplied args are sufficient for calling a function. >>> validate_args(lambda a: None) Traceback (most recent call last): ... MissingArgs: An argument is missing >>> validate_args(lambda a, b, c, d: None, 0, c=1) Traceback (most recent call last): ... MissingArgs: 2 arguments are missing :param fn: the function to check :param arg: the positional arguments supplied :param kwargs: the keyword arguments supplied """ argspec = inspect.getargspec(fn) num_defaults = len(argspec.defaults or []) required_args = argspec.args[:len(argspec.args) - num_defaults]
**** CubicPower OpenStack Study **** def validate_args(fn, *args, **kwargs): """Check that the supplied args are sufficient for calling a function. >>> validate_args(lambda a: None) Traceback (most recent call last): ... MissingArgs: An argument is missing >>> validate_args(lambda a, b, c, d: None, 0, c=1) Traceback (most recent call last): ... MissingArgs: 2 arguments are missing :param fn: the function to check :param arg: the positional arguments supplied :param kwargs: the keyword arguments supplied """ argspec = inspect.getargspec(fn) num_defaults = len(argspec.defaults or []) required_args = argspec.args[:len(argspec.args) - num_defaults]
**** CubicPower OpenStack Study **** def isbound(method): return getattr(method, 'im_self', None) is not None if isbound(fn): required_args.pop(0) missing = [arg for arg in required_args if arg not in kwargs] missing = missing[len(args):] if missing: raise MissingArgs(missing)
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