1447319 - upgrade core apps to python 3

Status: RESOLVED FIXED

(Release Engineering Graveyard :: Applications: Balrog (backend), enhancement, P3)

Description

[[e-mail] (:bhearsum)]

Python 2 support ends in less than 2 years (January 1st, 2020). We need to switch to Python 3 before this date to ensure we don't end up with an insecure stack.

To do this upgrade, we'll need to do a few things:
* Upgrade to the latest version of all libraries.
** SQLAlchemy and SQAlchemy-migrate need upgrades. These shouldn't be too difficult, but will require some work.
** Mysql-python does not support Python3, but there are alternatives. https://github.com/PyMySQL/mysqlclient-python looks like the most likely library to switch to.
* Make code python3 compatible (make sure we're not using Python 2 style exceptions, print statement, etc.)
* Start running tests against Python3 in CI - hopefully in a way that doesn't cause full only failures to start
* Start building Python3 Docker images for testing

Once all of the above is done we should probably set up a production-like environment with the python3 images for additional testing. We may even want to run Python2 and Python3 backends in production at the same time to do some comparisons.

Comment 1

[[e-mail] (:bhearsum)]

We completed this work a couple of weeks ago.