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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2011 OpenStack Foundation.
# All Rights Reserved.
#
# 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.
"""Utility methods for working with functions/decorators."""
import inspect
def get_wrapped_function(function):
"""Get the method at the bottom of a stack of decorators."""
if not hasattr(function, 'func_closure') or not function.func_closure:
return function
def _get_wrapped_function(function):
if not hasattr(function, 'func_closure') or not function.func_closure:
return None
for closure in function.func_closure:
func = closure.cell_contents
deeper_func = _get_wrapped_function(func)
if deeper_func:
return deeper_func
elif hasattr(closure.cell_contents, '__call__'):
return closure.cell_contents
return _get_wrapped_function(function)
def getcallargs(function, *args, **kwargs):
"""This is a simplified inspect.getcallargs (2.7+).
It should be replaced when python >= 2.7 is standard.
"""
keyed_args = {}
argnames, varargs, keywords, defaults = inspect.getargspec(function)
keyed_args.update(kwargs)
# NOTE(alaski) the implicit 'self' or 'cls' argument shows up in
# argnames but not in args or kwargs. Uses 'in' rather than '==' because
# some tests use 'self2'.
if 'self' in argnames[0] or 'cls' == argnames[0]:
# The function may not actually be a method or have im_self.
# Typically seen when it's stubbed with mox.
if inspect.ismethod(function) and hasattr(function, 'im_self'):
keyed_args[argnames[0]] = function.im_self
else:
keyed_args[argnames[0]] = None
remaining_argnames = filter(lambda x: x not in keyed_args, argnames)
keyed_args.update(dict(zip(remaining_argnames, args)))
if defaults:
num_defaults = len(defaults)
for argname, value in zip(argnames[-num_defaults:], defaults):
if argname not in keyed_args:
keyed_args[argname] = value
return keyed_args
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