86 lines
3.0 KiB
Python
86 lines
3.0 KiB
Python
"""Preconfigured converters for tomlkit."""
|
|
from base64 import b85decode, b85encode
|
|
from datetime import date, datetime
|
|
from enum import Enum
|
|
from operator import attrgetter
|
|
from typing import Any, Type, TypeVar, Union
|
|
|
|
from tomlkit import dumps, loads
|
|
from tomlkit.items import Float, Integer, String
|
|
|
|
from cattrs._compat import AbstractSet, is_mapping
|
|
|
|
from ..converters import BaseConverter, Converter
|
|
from ..strategies import configure_union_passthrough
|
|
from . import validate_datetime
|
|
|
|
T = TypeVar("T")
|
|
_enum_value_getter = attrgetter("_value_")
|
|
|
|
|
|
class TomlkitConverter(Converter):
|
|
def dumps(self, obj: Any, unstructure_as: Any = None, **kwargs: Any) -> str:
|
|
return dumps(self.unstructure(obj, unstructure_as=unstructure_as), **kwargs)
|
|
|
|
def loads(self, data: str, cl: Type[T]) -> T:
|
|
return self.structure(loads(data), cl)
|
|
|
|
|
|
def configure_converter(converter: BaseConverter):
|
|
"""
|
|
Configure the converter for use with the tomlkit library.
|
|
|
|
* bytes are serialized as base85 strings
|
|
* sets are serialized as lists
|
|
* tuples are serializas as lists
|
|
* mapping keys are coerced into strings when unstructuring
|
|
"""
|
|
converter.register_structure_hook(bytes, lambda v, _: b85decode(v))
|
|
converter.register_unstructure_hook(
|
|
bytes, lambda v: (b85encode(v) if v else b"").decode("utf8")
|
|
)
|
|
|
|
def gen_unstructure_mapping(cl: Any, unstructure_to=None):
|
|
key_handler = str
|
|
args = getattr(cl, "__args__", None)
|
|
if args:
|
|
# Currently, tomlkit has inconsistent behavior on 3.11
|
|
# so we paper over it here.
|
|
# https://github.com/sdispater/tomlkit/issues/237
|
|
if issubclass(args[0], str):
|
|
key_handler = _enum_value_getter if issubclass(args[0], Enum) else None
|
|
elif issubclass(args[0], bytes):
|
|
|
|
def key_handler(k: bytes):
|
|
return b85encode(k).decode("utf8")
|
|
|
|
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)]
|
|
)
|
|
|
|
# datetime inherits from date, so identity unstructure hook used
|
|
# here to prevent the date unstructure hook running.
|
|
converter.register_unstructure_hook(datetime, lambda v: v)
|
|
converter.register_structure_hook(datetime, validate_datetime)
|
|
converter.register_unstructure_hook(date, lambda v: v.isoformat())
|
|
converter.register_structure_hook(date, lambda v, _: date.fromisoformat(v))
|
|
configure_union_passthrough(
|
|
Union[str, String, bool, int, Integer, float, Float], converter
|
|
)
|
|
|
|
|
|
def make_converter(*args: Any, **kwargs: Any) -> TomlkitConverter:
|
|
kwargs["unstruct_collection_overrides"] = {
|
|
AbstractSet: list,
|
|
tuple: list,
|
|
**kwargs.get("unstruct_collection_overrides", {}),
|
|
}
|
|
res = TomlkitConverter(*args, **kwargs)
|
|
configure_converter(res)
|
|
|
|
return res
|