def print_type(gtype, nonnull=True, except_types=()):
if isinstance(gtype, except_types):
raise ValidationError(f'{gtype} is not a valid type')
literal = None
if is_union(gtype):
if is_optional(gtype):
return f'{print_type(gtype.__args__[0], nonnull=False, except_types=except_types)}' # noqa
else:
raise ValidationError(
f'Native Union type is not supported except Optional')
elif is_list(gtype):
literal = f'[{print_type(gtype.__args__[0], except_types=except_types)}]' # noqa
elif isinstance(gtype, types.ObjectType):
literal = f'{gtype.__name__}'
elif gtype in VALID_BASIC_TYPES:
literal = VALID_BASIC_TYPES[gtype]
elif gtype is None or gtype == type(None): # noqa
return 'null'
elif isinstance(gtype, types.UnionType):
literal = f'{gtype.__name__}'
elif isinstance(gtype, types.EnumType):
literal = f'{gtype.__name__}'
elif isinstance(gtype, types.InputType):
literal = f'{gtype.__name__}'
elif isinstance(gtype, types.InterfaceType):
literal = f'{gtype.__name__}'
else:
raise ValidationError(f'Can not convert type {gtype} to GraphQL type')
if nonnull:
literal += '!'
return literal
def validate(cls):
for name, field in cls.__fields__.items():
if name not in cls.VALID_ROOT_TYPES:
raise ValidationError(
f'The valid root type must be {cls.VALID_ROOT_TYPES},'
f' rather than {name}')
if not isinstance(field, Field):
raise ValidationError(f'{field} is an invalid field type')
if not is_optional(field.ftype):
raise ValidationError(
f'The return type of root object should be Optional')
if not isinstance(field.ftype.__args__[0], ObjectType):
raise ValidationError(
f'The typt of root object must be an Object, rather than {field.ftype}'
)
ObjectType.validate(cls)
def load_variable(variable, ptype):
if isinstance(ptype, types.InputType):
data = {}
keys = ptype.__dataclass_fields__.keys()
for key, value in variable.items():
snake_cases = to_snake_case(key)
data[snake_cases if key not in keys else key] = load_variable(
value, ptype.__fields__[snake_cases].ftype)
return ptype(**data)
elif is_list(ptype):
return [load_variable(i, ptype.__args__[0]) for i in variable]
elif is_optional(ptype):
if variable is None:
return None
return load_variable(variable, ptype.__args__[0])
elif isinstance(ptype, types.EnumType):
return getattr(ptype, variable)
else:
return variable
def __check_return_type__(cls, return_type, result):
if is_optional(return_type):
if result is None:
return True
return cls.__check_return_type__(return_type.__args__[0], result)
elif is_list(return_type):
if len(result) == 0:
return True
for item in result:
if not cls.__check_return_type__(return_type.__args__[0],
item):
return False
return True
elif isinstance(return_type, types.UnionType):
for member in return_type.members:
if cls.__check_return_type__(member, result):
return True
elif isinstance(result, return_type):
return True
return False
def test_is_optional():
assert is_optional(typing.Optional[str]) is True
assert is_optional(typing.Union[str, None]) is True
assert is_optional(typing.Union[str, int, None]) is False