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# vim: tabstop=4 shiftwidth=4 softtabstop=4
# 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 sys
from openstack.common import exception
TIME_FORMAT = "%Y-%m-%dT%H:%M:%SZ"
def int_from_bool_as_string(subject):
"""
Interpret a string as a boolean and return either 1 or 0.
Any string value in:
('True', 'true', 'On', 'on', '1')
is interpreted as a boolean True.
Useful for JSON-decoded stuff and config file parsing
"""
return bool_from_string(subject) and 1 or 0
def bool_from_string(subject):
"""
Interpret a string as a boolean.
Any string value in:
('True', 'true', 'On', 'on', '1')
is interpreted as a boolean True.
Useful for JSON-decoded stuff and config file parsing
"""
if type(subject) == type(bool):
return subject
if hasattr(subject, 'startswith'): # str or unicode...
if subject.strip().lower() in ('true', 'on', '1'):
return True
return False
def import_class(import_str):
"""Returns a class from a string including module and class"""
mod_str, _sep, class_str = import_str.rpartition('.')
try:
__import__(mod_str)
return getattr(sys.modules[mod_str], class_str)
except (ImportError, ValueError, AttributeError):
raise exception.NotFound('Class %s cannot be found' % class_str)
def import_object(import_str):
"""Returns an object including a module or module and class"""
try:
__import__(import_str)
return sys.modules[import_str]
except ImportError:
cls = import_class(import_str)
return cls()
def isotime(at=None):
if not at:
at = datetime.datetime.utcnow()
return at.strftime(TIME_FORMAT)
def parse_isotime(timestr):
return datetime.datetime.strptime(timestr, TIME_FORMAT)
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