Backport #9276 to 3.16: Content app can have unusable/closed db connections in pulpcore 3.15/3.16
We've seen multiple times the
django.db.utils.InterfaceError: connection already closed while using content app. See related issues.
A current workaround is to reset the db connection in multiple places in the code. This "solution" is likely not reliable if we are not resetting db connection before every db request.
This problem needs investigation to understand why Django doesn't take care of the db connections itself, and how to solve it properly.
Added by email@example.com about 2 years ago
Handles closed db connections
When the authentication middleware was added in pulpcore 3.15, it became the first place in the content app that made an attempt to use the database. As a result, it is a convinient place to handle InterfaceError and OperationalError which are raised when the database connection has been closed. When this occurs, Handler._reset_db_connection() is called to clean up the database connection and the middleware tries to use the database again.
If the database connection is closed later in the handling of the request by the content app, the user will still get a 500 error. However, the next request will be handled properly.
This patch also adds a call to Handler._reset_db_connection() inside the heartbeat method.
(cherry picked from commit 3faa649ddb0737c23d1e309a8c38ecb41804cebe)