Python: Multiple django improvements

[RasmusWL]

This PR covers 3 improvements to our django modeling, so we now handle:

• view functions that have decorators
• classes used with .as_view() in routing setup, but without known view super-type
• taint of self.request, self.args, and self.kwargs on view class

I can be persuaded to split this into 3 PRs, I just found it easy to do them together. Will strongly recommend going through changes commit-by-commit

[yoff]

Overall looks like nice improvements (good catch that djangoRouteHandlerFunctionTracker still tracks all functions).

[yoff]

Should this (and below) use PossibleDjangoViewClass?

[RasmusWL]

Nope. PossibleDjangoViewClass might be a bit too strongly worded. Maybe it should have been called ProbablyNotDjangoViewClass 😆

[yoff]

Is the name meant to make me think of the Range pattern?

[RasmusWL]

nope.

[yoff]

Thanks for the explanations. I am still not quite sure of the role of/need for PossibleDjangoViewClass. It seems like a not-meant-to-use-further extension point.
Apart from this, I am happy to merge this.

[RasmusWL]

The role of PossibleDjangoViewClass is to enable us to do this bit Improved modeling of django View classes. We now consider any class using in a routing setup with <class>.as_view() as django view class.

PossibleDjangoViewClass is not an extension point (and it is not abstract).

Since we no longer want to restrict the classes considered for tracking <class>.as_view(), We need a to include two sets of classes, to be considered a django view class (possibly with overlap):

• the classes that have a known view class as a super-class
• the classes that are used with <class>.as_view()

The sole purpose of PossibleDjangoViewClass is to provide tracking mechanisms for <class>.as_view() for all classes. Since it's all classes, this models all possible future django view classes.

Hopefully this makes things more clear. Otherwise let's talk on zoom. If you do get an aha moment, would probably be cool with a docs suggestion so it's more clear for the next person 🤷

[yoff]

Thanks, LGTM