c6a27dc540
* Stole most of the code from nova rpc * Updated the rpc and kombu code so it works with reddwarf * Import of openstack-common, added the context from common * Extended the common context
113 lines
3.1 KiB
Python
113 lines
3.1 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright 2011 OpenStack LLC.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""I totally stole most of this from melange, thx guys!!!"""
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import datetime
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import inspect
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import re
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import uuid
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from reddwarf.openstack.common import utils as openstack_utils
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import_class = openstack_utils.import_class
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import_object = openstack_utils.import_object
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bool_from_string = openstack_utils.bool_from_string
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isotime = openstack_utils.isotime
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def stringify_keys(dictionary):
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if dictionary is None:
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return None
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return dict((str(key), value) for key, value in dictionary.iteritems())
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def generate_uuid():
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return str(uuid.uuid4())
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def utcnow():
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return datetime.datetime.utcnow()
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class cached_property(object):
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"""A decorator that converts a function into a lazy property.
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Taken from : https://github.com/nshah/python-memoize
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The function wrapped is called the first time to retrieve the result
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and than that calculated result is used the next time you access
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the value:
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class Foo(object):
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@cached_property
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def bar(self):
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# calculate something important here
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return 42
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"""
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def __init__(self, func, name=None, doc=None):
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self.func = func
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self.__name__ = name or func.__name__
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self.__doc__ = doc or func.__doc__
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def __get__(self, obj, type=None):
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if obj is None:
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return self
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value = self.func(obj)
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setattr(obj, self.__name__, value)
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return value
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class MethodInspector(object):
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def __init__(self, func):
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self._func = func
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@cached_property
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def required_args(self):
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return self.args[0:self.required_args_count]
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@cached_property
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def optional_args(self):
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keys = self.args[self.required_args_count: len(self.args)]
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return zip(keys, self.defaults)
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@cached_property
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def defaults(self):
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return self.argspec.defaults or ()
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@cached_property
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def required_args_count(self):
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return len(self.args) - len(self.defaults)
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@cached_property
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def args(self):
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args = self.argspec.args
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if inspect.ismethod(self._func):
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args.pop(0)
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return args
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@cached_property
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def argspec(self):
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return inspect.getargspec(self._func)
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def __str__(self):
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optionals = ["[{0}=<{0}>]".format(k) for k, v in self.optional_args]
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required = ["{0}=<{0}>".format(arg) for arg in self.required_args]
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args_str = ' '.join(required + optionals)
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return "%s %s" % (self._func.__name__, args_str)
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