135 lines
3.6 KiB
Python
135 lines
3.6 KiB
Python
# Copyright 2013 IBM Corp.
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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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"""Utility methods for objects"""
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import ast
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import datetime
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import iso8601
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import netaddr
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from oslo_utils import timeutils
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import six
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from magnum.openstack.common._i18n import _
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def datetime_or_none(dt):
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"""Validate a datetime or None value."""
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if dt is None:
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return None
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elif isinstance(dt, datetime.datetime):
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if dt.utcoffset() is None:
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# NOTE(danms): Legacy objects from sqlalchemy are stored in UTC,
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# but are returned without a timezone attached.
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# As a transitional aid, assume a tz-naive object is in UTC.
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return dt.replace(tzinfo=iso8601.iso8601.Utc())
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else:
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return dt
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raise ValueError(_("A datetime.datetime is required here"))
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def datetime_or_str_or_none(val):
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if isinstance(val, six.string_types):
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return timeutils.parse_isotime(val)
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return datetime_or_none(val)
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def int_or_none(val):
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"""Attempt to parse an integer value, or None."""
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if val is None:
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return val
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else:
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return int(val)
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def str_or_none(val):
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"""Attempt to stringify a value to unicode, or None."""
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if val is None:
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return val
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else:
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return six.text_type(val)
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def dict_or_none(val):
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"""Attempt to dictify a value, or None."""
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if val is None:
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return {}
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elif isinstance(val, six.string_types):
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return dict(ast.literal_eval(val))
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else:
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try:
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return dict(val)
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except ValueError:
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return {}
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def list_or_none(val):
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"""Attempt to listify a value, or None."""
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if val is None:
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return []
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elif isinstance(val, six.string_types):
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return list(ast.literal_eval(val))
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else:
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try:
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return list(val)
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except ValueError:
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return []
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def ip_or_none(version):
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"""Return a version-specific IP address validator."""
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def validator(val, version=version):
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if val is None:
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return val
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else:
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return netaddr.IPAddress(val, version=version)
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return validator
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def nested_object_or_none(objclass):
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def validator(val, objclass=objclass):
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if val is None or isinstance(val, objclass):
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return val
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raise ValueError(_("An object of class %s is required here")
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% objclass)
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return validator
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def dt_serializer(name):
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"""Return a datetime serializer for a named attribute."""
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def serializer(self, name=name):
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if getattr(self, name) is not None:
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return timeutils.isotime(getattr(self, name))
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else:
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return None
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return serializer
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def dt_deserializer(instance, val):
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"""A deserializer method for datetime attributes."""
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if val is None:
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return None
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else:
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return timeutils.parse_isotime(val)
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def obj_serializer(name):
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def serializer(self, name=name):
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if getattr(self, name) is not None:
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return getattr(self, name).obj_to_primitive()
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else:
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return None
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return serializer
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