/usr/share/pyshared/melange/common/utils.py is in python-melange 1:2012.1-3.
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# Copyright 2011 OpenStack LLC.
# 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.
"""System-level utilities and helper functions."""
import datetime
import inspect
import re
import uuid
from melange.openstack.common import utils as openstack_utils
from melange.common import exception
import_class = openstack_utils.import_class
import_object = openstack_utils.import_object
bool_from_string = openstack_utils.bool_from_string
def parse_int(subject):
try:
return int(subject)
except (ValueError, TypeError):
return None
def utcnow():
return datetime.datetime.utcnow()
def underscore(string):
return re.sub(r'\B((?<=[a-z])[A-Z]|[A-Z](?=[a-z]))',
r'_\1', string).lower()
def exclude(key_values, *exclude_keys):
if key_values is None:
return None
return dict((key, value) for key, value in key_values.iteritems()
if key not in exclude_keys)
def filter_dict(key_values, *include_keys):
if key_values is None:
return None
return dict((key, value) for key, value in key_values.iteritems()
if key in include_keys)
def stringify_keys(dictionary):
if dictionary is None:
return None
return dict((str(key), value) for key, value in dictionary.iteritems())
def find(predicate, items):
for item in items:
if predicate(item) is True:
return item
def generate_uuid():
return str(uuid.uuid4())
def remove_nones(hash):
return dict((key, value)
for key, value in hash.iteritems() if value is not None)
class cached_property(object):
"""A decorator that converts a function into a lazy property.
Taken from : https://github.com/nshah/python-memoize
The function wrapped is called the first time to retrieve the result
and than that calculated result is used the next time you access
the value:
class Foo(object):
@cached_property
def bar(self):
# calculate something important here
return 42
"""
def __init__(self, func, name=None, doc=None):
self.func = func
self.__name__ = name or func.__name__
self.__doc__ = doc or func.__doc__
def __get__(self, obj, type=None):
if obj is None:
return self
value = self.func(obj)
setattr(obj, self.__name__, value)
return value
class MethodInspector(object):
def __init__(self, func):
self._func = func
@cached_property
def required_args(self):
return self.args[0:self.required_args_count]
@cached_property
def optional_args(self):
keys = self.args[self.required_args_count: len(self.args)]
return zip(keys, self.defaults)
@cached_property
def defaults(self):
return self.argspec.defaults or ()
@cached_property
def required_args_count(self):
return len(self.args) - len(self.defaults)
@cached_property
def args(self):
args = self.argspec.args
if inspect.ismethod(self._func):
args.pop(0)
return args
@cached_property
def argspec(self):
return inspect.getargspec(self._func)
def __str__(self):
optionals = ["[{0}=<{0}>]".format(k) for k, v in self.optional_args]
required = ["{0}=<{0}>".format(arg) for arg in self.required_args]
args_str = ' '.join(required + optionals)
return "%s %s" % (self._func.__name__, args_str)
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