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# Copyright 2012 Brian Waldon
#
# 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.
"""Self-validating model for arbitrary objects"""
import copy
import jsonpatch
import jsonschema
import exceptions
class Model(dict):
def __init__(self, *args, **kwargs):
# we overload setattr so set this manually
d = dict(*args, **kwargs)
try:
self.validate(d)
except exceptions.ValidationError as exc:
raise ValueError(str(exc))
else:
dict.__init__(self, d)
self.__dict__['changes'] = {}
self.__dict__['__original__'] = copy.deepcopy(d)
def __setitem__(self, key, value):
mutation = dict(self.items())
mutation[key] = value
try:
self.validate(mutation)
except exceptions.ValidationError:
msg = "Unable to set '%s' to '%s'" % (key, value)
raise exceptions.InvalidOperation(msg)
dict.__setitem__(self, key, value)
self.__dict__['changes'][key] = value
def __delitem__(self, key):
mutation = dict(self.items())
del mutation[key]
try:
self.validate(mutation)
except exceptions.ValidationError:
msg = "Unable to delete attribute '%s'" % (key)
raise exceptions.InvalidOperation(msg)
dict.__delitem__(self, key)
def __getattr__(self, key):
try:
return self.__getitem__(key)
except KeyError:
raise AttributeError(key)
def __setattr__(self, key, value):
self.__setitem__(key, value)
def __delattr__(self, key):
self.__delitem__(key)
### BEGIN dict compatibility methods ###
def clear(self):
raise exceptions.InvalidOperation()
def pop(self, key, default=None):
raise exceptions.InvalidOperation()
def popitem(self):
raise exceptions.InvalidOperation()
def copy(self):
return copy.deepcopy(dict(self))
def update(self, other):
mutation = dict(self.items())
mutation.update(other)
try:
self.validate(mutation)
except exceptions.ValidationError as exc:
raise exceptions.InvalidOperation(str(exc))
dict.update(self, other)
def iteritems(self):
return copy.deepcopy(dict(self)).iteritems()
def items(self):
return copy.deepcopy(dict(self)).items()
def itervalues(self):
return copy.deepcopy(dict(self)).itervalues()
def values(self):
return copy.deepcopy(dict(self)).values()
### END dict compatibility methods ###
@property
def patch(self):
"""Return a jsonpatch object representing the delta"""
original = self.__dict__['__original__']
return jsonpatch.make_patch(original, dict(self)).to_string()
@property
def changes(self):
"""Dumber version of 'patch' method - this should be deprecated"""
return copy.deepcopy(self.__dict__['changes'])
def validate(self, obj):
"""Apply a JSON schema to an object"""
try:
jsonschema.validate(obj, self.schema)
except jsonschema.ValidationError as exc:
raise exceptions.ValidationError(str(exc))
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