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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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