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- import _compat_pickle
- import pickle
- from .importer import Importer
- class PackageUnpickler(pickle._Unpickler): # type: ignore[name-defined]
- """Package-aware unpickler.
- This behaves the same as a normal unpickler, except it uses `importer` to
- find any global names that it encounters while unpickling.
- """
- def __init__(self, importer: Importer, *args, **kwargs):
- super().__init__(*args, **kwargs)
- self._importer = importer
- def find_class(self, module, name):
- # Subclasses may override this.
- if self.proto < 3 and self.fix_imports: # type: ignore[attr-defined]
- if (module, name) in _compat_pickle.NAME_MAPPING:
- module, name = _compat_pickle.NAME_MAPPING[(module, name)]
- elif module in _compat_pickle.IMPORT_MAPPING:
- module = _compat_pickle.IMPORT_MAPPING[module]
- mod = self._importer.import_module(module)
- return getattr(mod, name)
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