17c909ec83
Signed-off-by: Dean Troyer <dtroyer@gmail.com>
68 lines
2.0 KiB
Python
68 lines
2.0 KiB
Python
# 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.
|
|
#
|
|
# Copyright (c) 2013-2014 Wind River Systems, Inc.
|
|
#
|
|
|
|
|
|
import inspect
|
|
|
|
|
|
class MissingArgs(Exception):
|
|
|
|
def __init__(self, missing):
|
|
self.missing = missing
|
|
|
|
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]
|
|
|
|
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)
|