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"""Core Warlock functionality"""
import copy
import jsonschema
class InvalidOperation(RuntimeError):
pass
class ValidationError(ValueError):
pass
def model_factory(schema):
"""Generate a model class based on the provided JSON Schema
:param schema: dict representing valid JSON schema
"""
schema = copy.deepcopy(schema)
def validator(obj):
"""Apply a JSON schema to an object"""
try:
jsonschema.validate(obj, schema)
except jsonschema.ValidationError:
raise ValidationError()
class Model(object):
"""Self-validating model for arbitrary objects"""
def __init__(self, **kwargs):
self.__dict__['validator'] = validator
try:
self.__dict__['validator'](kwargs)
except ValidationError:
raise ValueError()
else:
self.__dict__['raw'] = kwargs
self.__dict__['changes'] = {}
def __getattr__(self, key):
try:
return self.__getitem__(key)
except KeyError:
raise AttributeError(key)
def __getitem__(self, key):
return self.__dict__['raw'][key]
def __setitem__(self, key, value):
mutation = copy.deepcopy(self.__dict__['raw'])
mutation[key] = value
try:
self.__dict__['validator'](mutation)
except ValidationError:
raise InvalidOperation()
self.__dict__['raw'] = mutation
self.__dict__['changes'][key] = value
def __setattr__(self, key, value):
self.__setitem__(key, value)
def iteritems(self):
return copy.deepcopy(self.__dict__['raw']).iteritems()
def items(self):
return copy.deepcopy(self.__dict__['raw']).items()
@property
def changes(self):
return copy.deepcopy(self.__dict__['changes'])
Model.__name__ = str(schema['name'])
return Model
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