python lsp

server/libs/cattrs/preconf/msgpack.py

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+"""Preconfigured converters for msgpack."""
+
+from collections.abc import Set
+from datetime import date, datetime, time, timezone
+from typing import Any, TypeVar, Union
+
+from msgpack import dumps, loads
+
+from ..converters import BaseConverter, Converter
+from ..fns import identity
+from ..literals import is_literal_containing_enums
+from ..strategies import configure_union_passthrough
+from . import is_primitive_enum, literals_with_enums_unstructure_factory, wrap
+
+__all__ = ["MsgpackConverter", "configure_converter", "make_converter"]
+
+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) -> None:
+    """
+    Configure the converter for use with the msgpack library.
+
+    * datetimes are serialized as timestamp floats
+    * sets are serialized as lists
+    * string and int enums are passed through when unstructuring
+
+    .. versionchanged:: 24.2.0
+        Enums are left to the library to unstructure, speeding them up.
+    """
+    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()
+    )
+    converter.register_unstructure_hook_func(is_primitive_enum, identity)
+    converter.register_unstructure_hook_factory(
+        is_literal_containing_enums, literals_with_enums_unstructure_factory
+    )
+    configure_union_passthrough(Union[str, bool, int, float, None, bytes], converter)
+
+
+@wrap(MsgpackConverter)
+def make_converter(*args: Any, **kwargs: Any) -> MsgpackConverter:
+    kwargs["unstruct_collection_overrides"] = {
+        Set: list,
+        **kwargs.get("unstruct_collection_overrides", {}),
+    }
+    res = MsgpackConverter(*args, **kwargs)
+    configure_converter(res)
+
+    return res