78 lines
2.5 KiB
Python
78 lines
2.5 KiB
Python
import json
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from dataclasses import MISSING, dataclass, fields
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from typing import Any, Dict, Optional, Self, get_type_hints
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@dataclass
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class BaseConfig:
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def to_dict(self) -> Dict[str, Any]:
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d = {}
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for fld in fields(self):
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v = getattr(self, fld.name)
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if isinstance(v, (str, int, float, bool)):
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d[fld.name] = v
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elif v is None:
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d[fld.name] = None
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elif isinstance(v, dict):
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try:
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json.dumps(v)
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d[fld.name] = v
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except (TypeError, ValueError):
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pass
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return d
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@classmethod
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def from_dict(cls, d: Dict[str, Any]) -> Self:
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hints = get_type_hints(cls)
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inst = cls.__new__(cls)
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for fld in fields(cls):
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if fld.name in d:
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v = d[fld.name]
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target = cls._unwrap_optional(hints.get(fld.name))
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if target is not None:
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try:
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v = cls._coerce(v, target)
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except (TypeError, ValueError):
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pass
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object.__setattr__(inst, fld.name, v)
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elif fld.default is not MISSING:
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object.__setattr__(inst, fld.name, fld.default)
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elif fld.default_factory is not MISSING:
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object.__setattr__(inst, fld.name, fld.default_factory())
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else:
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object.__setattr__(inst, fld.name, None)
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return inst
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@staticmethod
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def _unwrap_optional(tp) -> Optional[type]:
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if tp is None:
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return None
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origin = getattr(tp, "__origin__", None)
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if origin is not None:
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args = getattr(tp, "__args__", ())
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non_none = [a for a in args if a is not type(None)]
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return non_none[0] if non_none else None
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return tp
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@staticmethod
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def _coerce(value: Any, target_type: type) -> Any:
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if target_type is bool and isinstance(value, bool):
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return value
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if (
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target_type is int
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and isinstance(value, (int, float))
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and not isinstance(value, bool)
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):
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return int(value)
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if (
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target_type is float
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and isinstance(value, (int, float))
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and not isinstance(value, bool)
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):
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return float(value)
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if target_type is str and isinstance(value, str):
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return value
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if isinstance(value, target_type):
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return value
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raise TypeError
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