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Diffstat (limited to 'openstack/common/funcutils.py')
-rw-r--r-- | openstack/common/funcutils.py | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/openstack/common/funcutils.py b/openstack/common/funcutils.py new file mode 100644 index 0000000..b04d58f --- /dev/null +++ b/openstack/common/funcutils.py @@ -0,0 +1,76 @@ +# 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 |