Create a 15.0 database with website, access the home page via your
browser. Stop the server and migrate the database to 16.0. Restart the
server with a `--dbfilter` that rejects the database you created and
refresh your browser. 500 Internal server error, attribute error:
the `request` object as no `session`.
An error could occurs after a migration to 16.0 due to the presence of
the `geoip` key in the session. `request.session.geoip` has been made a
deprecated alias to `request.geoip` between 15.0 and 16.0, see 04e9726.
Because the session was created before 16.0, the session dict does
contain a `geoip` key. Upon logging the session out, the session dict
is cleared. The default implementation of `clear()`[^1] inside of
`collections.abc.MutableMapping` can be summarized for our usecase to:
for key in self:
value = self[key]
del self[key]
There is an extra `__getitem__` call due to `value = self[key]`, in the
case of the `geoip` key, it would access the alias. It is not possible
to accessing that alias inside of the `_get_dbname_and_session` method
of request as the session has not been set on `self` (the request) yet.
Yet inside of that method, we do `session.logout()` which `clear()` the
session which (wrongly) access the alias because `geoip` exists in the
internal dict (`'geoip' in self.keys() # True`).
The solution has been to implement the `clear()` function ourself
instead of using the mixin of `MutableMapping`.
[^1]: https://github.com/python/cpython/blob/b43496c01a554cf41ae654a0379efae18609ad39/Lib/_collections_abc.py#L925-L931closesodoo/odoo#105763
X-original-commit: b66e1ffa8e348eedf2de735babbc398290a8bffb
Signed-off-by: Julien Castiaux <juc@odoo.com>
Julien Castiaux
ec4826ef5b