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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.
"""
Time related utilities and helper functions.
"""
import datetime
import iso8601
TIME_FORMAT = "%Y-%m-%dT%H:%M:%S"
def isotime(at=None):
"""Stringify time in ISO 8601 format"""
if not at:
at = datetime.datetime.utcnow()
str = at.strftime(TIME_FORMAT)
tz = at.tzinfo.tzname(None) if at.tzinfo else 'UTC'
str += ('Z' if tz == 'UTC' else tz)
return str
def parse_isotime(timestr):
"""Parse time from ISO 8601 format"""
try:
return iso8601.parse_date(timestr)
except iso8601.ParseError as e:
raise ValueError(e.message)
except TypeError as e:
raise ValueError(e.message)
def normalize_time(timestamp):
"""Normalize time in arbitrary timezone to UTC"""
offset = timestamp.utcoffset()
return timestamp.replace(tzinfo=None) - offset if offset else timestamp
def utcnow():
"""Overridable version of utils.utcnow."""
if utcnow.override_time:
return utcnow.override_time
return datetime.datetime.utcnow()
utcnow.override_time = None
def set_time_override(override_time=datetime.datetime.utcnow()):
"""Override utils.utcnow to return a constant time."""
utcnow.override_time = override_time
def clear_time_override():
"""Remove the overridden time."""
utcnow.override_time = None
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