mirror of
https://github.com/Hopiu/django-imagekit.git
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35 lines
814 B
Python
35 lines
814 B
Python
from copy import copy
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from hashlib import md5
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from pickle import MARK, DICT
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try:
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from pickle import _Pickler
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except ImportError:
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# Python 2 compatible
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from pickle import Pickler as _Pickler
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from .lib import StringIO
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class CanonicalizingPickler(_Pickler):
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dispatch = copy(_Pickler.dispatch)
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def save_set(self, obj):
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rv = obj.__reduce_ex__(0)
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rv = (rv[0], (sorted(rv[1][0]),), rv[2])
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self.save_reduce(obj=obj, *rv)
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dispatch[set] = save_set
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def save_dict(self, obj):
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write = self.write
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write(MARK + DICT)
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self.memoize(obj)
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self._batch_setitems(sorted(obj.items()))
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dispatch[dict] = save_dict
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def pickle(obj):
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file = StringIO()
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CanonicalizingPickler(file, 0).dump(obj)
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return md5(file.getvalue()).hexdigest()
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