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# Copyright 2014 Hewlett-Packard Development Company, L.P.
#
# 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.
import datetime
from oslo_log import log
from oslo_versionedobjects import fields
from designate import exceptions
from designate import objects
from designate import utils
LOG = log.getLogger(__name__)
class DesignateObjectAdapterMetaclass(type):
def __init__(cls, name, bases, cls_dict):
if not hasattr(cls, '_adapter_classes'):
cls._adapter_classes = {}
return
key = '%s:%s' % (cls.adapter_format(), cls.adapter_object())
if key not in cls._adapter_classes:
cls._adapter_classes[key] = cls
else:
raise Exception(
"Duplicate DesignateAdapterObject with"
" format '%(format)s and object %(object)s'" %
{
'format': cls.adapter_format(),
'object': cls.adapter_object()
}
)
class DesignateAdapter(object, metaclass=DesignateObjectAdapterMetaclass):
"""docstring for DesignateObjectAdapter"""
ADAPTER_FORMAT = None
ADAPTER_OBJECT = objects.DesignateObject
MODIFICATIONS = None
@classmethod
def adapter_format(cls):
return cls.ADAPTER_FORMAT
@classmethod
def adapter_object(cls):
return cls.ADAPTER_OBJECT.obj_name()
@classmethod
def get_object_adapter(cls, obj, obj_format=None):
if obj_format is None:
obj_format = cls.ADAPTER_FORMAT
if isinstance(obj, objects.DesignateObject):
key = '%s:%s' % (obj_format, obj.obj_name())
else:
key = '%s:%s' % (obj_format, obj)
try:
return cls._adapter_classes[key]
except KeyError as e:
keys = str(e).split(':')
raise exceptions.AdapterNotFound(
'Adapter for %(obj)s to format %(format)s not found' %
{
'obj': keys[1],
'format': keys[0]
}
)
#####################
# Rendering methods #
#####################
@classmethod
def render(cls, obj_format, obj, *args, **kwargs):
adapter = cls.get_object_adapter(obj, obj_format)
if isinstance(obj, objects.ListObjectMixin):
return adapter.render_list(obj, *args, **kwargs)
else:
return adapter.render_object(obj, *args, **kwargs)
@staticmethod
def is_datetime_field(obj, key):
field = obj.FIELDS.get(key, {})
if isinstance(field, fields.Field):
# TODO(daidv): If we change to use DateTimeField or STL
# we should change this to exact object
return isinstance(field, fields.DateTimeField)
else:
return field.get('schema', {}).get('format', '') == 'date-time'
@staticmethod
def obj_formatdatetime_field(obj):
return datetime.datetime.strftime(obj, utils.DATETIME_FORMAT)
@classmethod
def render_object(cls, obj, *args, **kwargs):
# The dict we will return to be rendered to JSON / output format
r_obj = {}
# Loop over all fields that are supposed to be output
for key, value in cls.MODIFICATIONS['fields'].items():
# Get properties for this field
field_props = cls.MODIFICATIONS['fields'][key]
# Check if it has to be renamed
if field_props.get('rename', False):
new_obj = getattr(obj, field_props.get('rename'))
# if rename is specified we need to change the key
obj_key = field_props.get('rename')
else:
# if not, move on
new_obj = getattr(obj, key, None)
obj_key = key
# Check if this item is a relation (another DesignateObject that
# will need to be converted itself
field = obj.FIELDS.get(obj_key, {})
if isinstance(field, dict) and field.get('relation'):
# Get an adapter for the nested object
# Get the class the object is and get its adapter, then set
# the item in the dict to the output
adapter = cls.get_object_adapter(
obj.FIELDS[obj_key].get('relation_cls')
)
r_obj[key] = adapter.render(cls.ADAPTER_FORMAT, new_obj, *args,
**kwargs)
elif hasattr(field, 'objname'):
# Add by daidv: Check if field is OVO field and have a relation
adapter = cls.get_object_adapter(field.objname)
r_obj[key] = adapter.render(cls.ADAPTER_FORMAT, new_obj, *args,
**kwargs)
elif cls.is_datetime_field(obj, obj_key) and new_obj is not None:
# So, we now have a datetime object to render correctly
# see bug #1579844
r_obj[key] = cls.obj_formatdatetime_field(new_obj)
else:
# Just attach the damn item if there is no weird edge cases
r_obj[key] = new_obj
return r_obj
@classmethod
def render_list(cls, list_objects, *args, **kwargs):
r_list = []
for obj in list_objects:
adapter = cls.get_object_adapter(obj)
r_list.append(
adapter.render(cls.ADAPTER_FORMAT, obj, *args, **kwargs)
)
return {
cls.MODIFICATIONS['options']['collection_name']: r_list
}
#####################
# Parsing methods #
#####################
@classmethod
def parse(cls, obj_format, values, output_object, *args, **kwargs):
LOG.debug(
'Creating %s object with values %r',
output_object.obj_name(), values
)
LOG.debug(output_object)
try:
adapter = cls.get_object_adapter(output_object, obj_format)
if isinstance(output_object, objects.ListObjectMixin):
return adapter.parse_list(
values, output_object, *args, **kwargs
)
else:
return adapter.parse_object(
values, output_object, *args, **kwargs
)
except TypeError as e:
LOG.exception(
'TypeError creating %(name)s with values %(values)r',
{
'name': output_object.obj_name(),
'values': values
})
raise exceptions.InvalidObject(
'Provided object is not valid. Got a TypeError with '
'message {}'.format(e)
)
except AttributeError as e:
LOG.exception(
'AttributeError creating %(name)s with values %(values)r',
{
'name': output_object.obj_name(),
'values': values
})
raise exceptions.InvalidObject(
'Provided object is not valid. Got an AttributeError with '
'message {}'.format(e)
)
except exceptions.InvalidObject:
LOG.info(
'InvalidObject creating %(name)s with values %(values)r',
{
'name': output_object.obj_name(),
'values': values
})
raise
except Exception as e:
LOG.exception(
'Exception creating %(name)s with values %(values)r',
{
'name': output_object.obj_name(),
'values': values
})
raise exceptions.InvalidObject(
'Provided object is not valid. Got a {} error with '
'message {}'.format(type(e).__name__, e)
)
@classmethod
def parse_object(cls, values, output_object, *args, **kwargs):
error_keys = []
for key, value in values.items():
if key not in cls.MODIFICATIONS['fields']:
error_keys.append(key)
continue
obj_key = key
field_props = cls.MODIFICATIONS['fields'][key]
if field_props.get('rename', False):
obj_key = field_props.get('rename')
#############################################################
# TODO(graham): Remove this section of code when validation #
# is moved into DesignateObjects properly #
#############################################################
# Check if the field should be allowed change after it is
# initially set (e.g. zone name)
if field_props.get('immutable', False):
if (getattr(output_object, obj_key, False) and
getattr(output_object, obj_key) != value):
error_keys.append(key)
break
# Is this field a read only field
elif (field_props.get('read_only', True) and
getattr(output_object, obj_key) != value):
error_keys.append(key)
break
# Check if the key is a nested object
check_field = output_object.FIELDS.get(obj_key, {})
if (isinstance(check_field, fields.Field) and
hasattr(check_field, 'objname')):
obj_class_name = output_object.FIELDS.get(obj_key).objname
obj_class = objects.DesignateObject.obj_cls_from_name(
obj_class_name
)
adapter = cls.get_object_adapter(obj_class_name)
obj = adapter.parse(value, obj_class())
setattr(output_object, obj_key, obj)
elif (not isinstance(check_field, fields.Field) and
check_field.get('relation', False)):
obj_class_name = output_object.FIELDS.get(obj_key, {}).get(
'relation_cls'
)
obj_class = objects.DesignateObject.obj_cls_from_name(
obj_class_name
)
adapter = cls.get_object_adapter(obj_class_name)
obj = adapter.parse(value, obj_class())
setattr(output_object, obj_key, obj)
else:
# No nested objects here, just set the value
setattr(output_object, obj_key, value)
if error_keys:
raise exceptions.InvalidObject(
'Provided object does not match schema. Keys {0} are not '
'valid for {1}'.format(
error_keys, cls.MODIFICATIONS['options']['resource_name']
)
)
return output_object
@classmethod
def parse_list(cls, values, output_object, *args, **kwargs):
for item in values:
adapter = cls.get_object_adapter(output_object.LIST_ITEM_TYPE())
output_object.append(
adapter.parse(item, output_object.LIST_ITEM_TYPE())
)
return output_object
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