161 lines
4.6 KiB
Python
161 lines
4.6 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 datetime
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import iso8601
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import netaddr
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import six
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from nova.network import model as network_model
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from nova.openstack.common.gettextutils import _
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from nova.openstack.common import timeutils
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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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# NOTE(danms): Being tolerant of isotime strings here will help us
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# during our objects transition
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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_value(val):
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if val is None:
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raise ValueError(_('None is not valid here'))
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return unicode(val)
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def str_or_none(val):
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"""Attempt to stringify a 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 str_value(val)
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def cstring(val):
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if val is None:
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raise ValueError(_('None is not valid here'))
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return str(val)
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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(objclass, none_ok=True):
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def validator(val, objclass=objclass):
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if none_ok and val is None:
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return val
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if isinstance(val, objclass):
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return val
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raise ValueError('An object of class %s is required here' % objclass)
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return validator
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def network_model_or_none(val):
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"""Validate/Convert to a network_model.NetworkInfo, or None."""
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if val is None:
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return val
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if isinstance(val, network_model.NetworkInfo):
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return val
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return network_model.NetworkInfo.hydrate(val)
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def list_of_strings_or_none(val):
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if val is None:
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return val
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if not isinstance(val, list):
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raise ValueError(_('A list of strings is required here'))
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if not all([isinstance(x, six.string_types) for x in val]):
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raise ValueError(_('Invalid values found in list '
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'(strings are required)'))
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return val
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def dict_of_strings_or_none(val):
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if val is None:
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return val
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if not isinstance(val, dict):
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try:
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val = dict(val.iteritems())
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except Exception:
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raise ValueError(_('A dict of strings is required here'))
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if not all([isinstance(x, six.string_types) for x in val.keys()]):
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raise ValueError(_('Invalid keys found in dict '
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'(strings are required)'))
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if not all([isinstance(x, six.string_types) for x in val.values()]):
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raise ValueError(_('Invalid values found in dict '
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'(strings are required)'))
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return val
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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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