90 lines
2.4 KiB
Python
90 lines
2.4 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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"""
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System-level utilities and helper functions.
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"""
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import datetime
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import sys
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from openstack.common import exception
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TIME_FORMAT = "%Y-%m-%dT%H:%M:%SZ"
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def int_from_bool_as_string(subject):
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"""
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Interpret a string as a boolean and return either 1 or 0.
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Any string value in:
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('True', 'true', 'On', 'on', '1')
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is interpreted as a boolean True.
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Useful for JSON-decoded stuff and config file parsing
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"""
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return bool_from_string(subject) and 1 or 0
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def bool_from_string(subject):
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"""
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Interpret a string as a boolean.
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Any string value in:
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('True', 'true', 'On', 'on', '1')
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is interpreted as a boolean True.
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Useful for JSON-decoded stuff and config file parsing
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"""
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if type(subject) == type(bool):
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return subject
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if hasattr(subject, 'startswith'): # str or unicode...
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if subject.strip().lower() in ('true', 'on', '1'):
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return True
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return False
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def import_class(import_str):
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"""Returns a class from a string including module and class"""
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mod_str, _sep, class_str = import_str.rpartition('.')
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try:
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__import__(mod_str)
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return getattr(sys.modules[mod_str], class_str)
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except (ImportError, ValueError, AttributeError):
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raise exception.NotFound('Class %s cannot be found' % class_str)
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def import_object(import_str):
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"""Returns an object including a module or module and class"""
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try:
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__import__(import_str)
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return sys.modules[import_str]
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except ImportError:
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cls = import_class(import_str)
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return cls()
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def isotime(at=None):
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if not at:
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at = datetime.datetime.utcnow()
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return at.strftime(TIME_FORMAT)
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def parse_isotime(timestr):
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return datetime.datetime.strptime(timestr, TIME_FORMAT)
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