Source code for cattr.preconf.orjson

"""Preconfigured converters for orjson."""
from base64 import b85decode, b85encode
from datetime import datetime
from enum import Enum
from typing import Any

from .._compat import Set, is_mapping
from ..converters import GenConverter


[docs]def configure_converter(converter: GenConverter): """ Configure the converter for use with the orjson library. * bytes are serialized as base85 strings * datetimes are serialized as ISO 8601 * sets are serialized as lists * string enum mapping keys have special handling * mapping keys are coerced into strings when unstructuring """ converter.register_unstructure_hook( bytes, lambda v: (b85encode(v) if v else b"").decode("utf8") ) converter.register_structure_hook(bytes, lambda v, _: b85decode(v)) converter.register_unstructure_hook(datetime, lambda v: v.isoformat()) converter.register_structure_hook( datetime, lambda v, _: datetime.fromisoformat(v) ) def gen_unstructure_mapping(cl: Any, unstructure_to=None): key_handler = str args = getattr(cl, "__args__", None) if args and issubclass(args[0], str) and issubclass(args[0], Enum): def key_handler(v): return v.value return converter.gen_unstructure_mapping( cl, unstructure_to=unstructure_to, key_handler=key_handler ) converter._unstructure_func.register_func_list( [(is_mapping, gen_unstructure_mapping, True)] )
[docs]def make_converter(*args, **kwargs) -> GenConverter: kwargs["unstruct_collection_overrides"] = { **kwargs.get("unstruct_collection_overrides", {}), Set: list, } res = GenConverter(*args, **kwargs) configure_converter(res) return res