usse/scrape/venv/lib/python3.10/site-packages/cattrs/preconf/msgpack.py
2023-12-22 15:26:01 +01:00

52 lines
1.7 KiB
Python

"""Preconfigured converters for msgpack."""
from datetime import date, datetime, time, timezone
from typing import Any, Type, TypeVar, Union
from msgpack import dumps, loads
from cattrs._compat import AbstractSet
from ..converters import BaseConverter, Converter
from ..strategies import configure_union_passthrough
T = TypeVar("T")
class MsgpackConverter(Converter):
def dumps(self, obj: Any, unstructure_as: Any = None, **kwargs: Any) -> bytes:
return dumps(self.unstructure(obj, unstructure_as=unstructure_as), **kwargs)
def loads(self, data: bytes, cl: Type[T], **kwargs: Any) -> T:
return self.structure(loads(data, **kwargs), cl)
def configure_converter(converter: BaseConverter):
"""
Configure the converter for use with the msgpack library.
* datetimes are serialized as timestamp floats
* sets are serialized as lists
"""
converter.register_unstructure_hook(datetime, lambda v: v.timestamp())
converter.register_structure_hook(
datetime, lambda v, _: datetime.fromtimestamp(v, timezone.utc)
)
converter.register_unstructure_hook(
date, lambda v: datetime.combine(v, time(tzinfo=timezone.utc)).timestamp()
)
converter.register_structure_hook(
date, lambda v, _: datetime.fromtimestamp(v, timezone.utc).date()
)
configure_union_passthrough(Union[str, bool, int, float, None, bytes], converter)
def make_converter(*args: Any, **kwargs: Any) -> MsgpackConverter:
kwargs["unstruct_collection_overrides"] = {
AbstractSet: list,
**kwargs.get("unstruct_collection_overrides", {}),
}
res = MsgpackConverter(*args, **kwargs)
configure_converter(res)
return res