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| import json | |
| from contextlib import suppress | |
| from pathlib import PurePath | |
| from typing import ( | |
| Any, | |
| Callable, | |
| ClassVar, | |
| Dict, | |
| List, | |
| Mapping, | |
| Optional, | |
| Sequence, | |
| Tuple, | |
| ) | |
| from .registry import _import_class, get_filesystem_class | |
| from .spec import AbstractFileSystem | |
| class FilesystemJSONEncoder(json.JSONEncoder): | |
| include_password: ClassVar[bool] = True | |
| def default(self, o: Any) -> Any: | |
| if isinstance(o, AbstractFileSystem): | |
| return o.to_dict(include_password=self.include_password) | |
| if isinstance(o, PurePath): | |
| cls = type(o) | |
| return {"cls": f"{cls.__module__}.{cls.__name__}", "str": str(o)} | |
| return super().default(o) | |
| def make_serializable(self, obj: Any) -> Any: | |
| """ | |
| Recursively converts an object so that it can be JSON serialized via | |
| :func:`json.dumps` and :func:`json.dump`, without actually calling | |
| said functions. | |
| """ | |
| if isinstance(obj, (str, int, float, bool)): | |
| return obj | |
| if isinstance(obj, Mapping): | |
| return {k: self.make_serializable(v) for k, v in obj.items()} | |
| if isinstance(obj, Sequence): | |
| return [self.make_serializable(v) for v in obj] | |
| return self.default(obj) | |
| class FilesystemJSONDecoder(json.JSONDecoder): | |
| def __init__( | |
| self, | |
| *, | |
| object_hook: Optional[Callable[[Dict[str, Any]], Any]] = None, | |
| parse_float: Optional[Callable[[str], Any]] = None, | |
| parse_int: Optional[Callable[[str], Any]] = None, | |
| parse_constant: Optional[Callable[[str], Any]] = None, | |
| strict: bool = True, | |
| object_pairs_hook: Optional[Callable[[List[Tuple[str, Any]]], Any]] = None, | |
| ) -> None: | |
| self.original_object_hook = object_hook | |
| super().__init__( | |
| object_hook=self.custom_object_hook, | |
| parse_float=parse_float, | |
| parse_int=parse_int, | |
| parse_constant=parse_constant, | |
| strict=strict, | |
| object_pairs_hook=object_pairs_hook, | |
| ) | |
| def try_resolve_path_cls(cls, dct: Dict[str, Any]): | |
| with suppress(Exception): | |
| fqp = dct["cls"] | |
| path_cls = _import_class(fqp) | |
| if issubclass(path_cls, PurePath): | |
| return path_cls | |
| return None | |
| def try_resolve_fs_cls(cls, dct: Dict[str, Any]): | |
| with suppress(Exception): | |
| if "cls" in dct: | |
| try: | |
| fs_cls = _import_class(dct["cls"]) | |
| if issubclass(fs_cls, AbstractFileSystem): | |
| return fs_cls | |
| except Exception: | |
| if "protocol" in dct: # Fallback if cls cannot be imported | |
| return get_filesystem_class(dct["protocol"]) | |
| raise | |
| return None | |
| def custom_object_hook(self, dct: Dict[str, Any]): | |
| if "cls" in dct: | |
| if (obj_cls := self.try_resolve_fs_cls(dct)) is not None: | |
| return AbstractFileSystem.from_dict(dct) | |
| if (obj_cls := self.try_resolve_path_cls(dct)) is not None: | |
| return obj_cls(dct["str"]) | |
| if self.original_object_hook is not None: | |
| return self.original_object_hook(dct) | |
| return dct | |
| def unmake_serializable(self, obj: Any) -> Any: | |
| """ | |
| Inverse function of :meth:`FilesystemJSONEncoder.make_serializable`. | |
| """ | |
| if isinstance(obj, dict): | |
| obj = self.custom_object_hook(obj) | |
| if isinstance(obj, dict): | |
| return {k: self.unmake_serializable(v) for k, v in obj.items()} | |
| if isinstance(obj, (list, tuple)): | |
| return [self.unmake_serializable(v) for v in obj] | |
| return obj | |