Error when loading session from 1.11 on 1.12

[kotofos]

Error when loading session from 1.11 on 1.12
Looks like a problem was introduced in the code handling deserialization of saved sessions. If the previous session was not serialized.

#122

8949516

Options:

• mark as invalid and delete with invalidate_corrupt
• add serializer=None
• fallback for loading non serialized sessions
• Mention it in docs

Reproduce

• Install 1.11
• Create session
• Install 1.12
• restart app
• get session

Tested on
pyramid==1.10.8
pyramid-beaker==0.8

  File "/home/kotofos/Documents/slashdb/slashdb_venv39/lib/python3.9/site-packages/pyramid/authentication.py", line 1151, in unauthenticated_userid
    return request.session.get(self.userid_key)
  File "/home/kotofos/Documents/slashdb/slashdb_venv39/lib/python3.9/site-packages/beaker/session.py", line 789, in __getattr__
    return getattr(self._session(), attr)
  File "/home/kotofos/Documents/slashdb/slashdb_venv39/lib/python3.9/site-packages/beaker/session.py", line 785, in _session
    self.__dict__['_sess'] = session_cls(req, **params)
  File "/home/kotofos/Documents/slashdb/slashdb_venv39/lib/python3.9/site-packages/beaker/session.py", line 227, in __init__
    self.load()
  File "/home/kotofos/Documents/slashdb/slashdb_venv39/lib/python3.9/site-packages/beaker/session.py", line 415, in load
    session_data = self._decrypt_data(session_data)
  File "/home/kotofos/Documents/slashdb/slashdb_venv39/lib/python3.9/site-packages/beaker/session.py", line 372, in _decrypt_data
    data = b64decode(session_data)
  File "/home/kotofos/Documents/slashdb/slashdb_venv39/lib/python3.9/site-packages/beaker/_compat.py", line 37, in b64decode
    return _b64decode(b.encode('ascii'))
AttributeError: 'dict' object has no attribute 'encode'

Workaround

Delete sessions from filesystem or use invalidate_corrupt