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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(dict):
"""Self-validating model for arbitrary objects"""
def __init__(self, *args, **kwargs):
d = dict(*args, **kwargs)
# we overload setattr so set this manually
self.__dict__['validator'] = validator
try:
self.validator(d)
except ValidationError:
raise ValueError()
else:
dict.__init__(self, d)
self.__dict__['changes'] = {}
def __getattr__(self, key):
try:
return self.__getitem__(key)
except KeyError:
raise AttributeError(key)
def __setitem__(self, key, value):
mutation = dict(self.items())
mutation[key] = value
try:
self.validator(mutation)
except ValidationError:
raise InvalidOperation()
dict.__setitem__(self, key, value)
self.__dict__['changes'][key] = value
def __setattr__(self, key, value):
self.__setitem__(key, value)
def clear(self):
raise InvalidOperation()
def pop(self, key, default=None):
raise InvalidOperation()
def popitem(self):
raise InvalidOperation()
def __delitem__(self, key):
raise InvalidOperation()
# NOTE(termie): This is kind of the opposite of what copy usually does
def copy(self):
return copy.deepcopy(dict(self))
def update(self, other):
mutation = dict(self.items())
mutation.update(other)
try:
self.validator(mutation)
except ValidationError:
raise InvalidOperation()
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()
@property
def changes(self):
return copy.deepcopy(self.__dict__['changes'])
Model.__name__ = str(schema['name'])
return Model
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