CachePanel: monkeypatch Django's caches across sys.modules

[blueyed]

Fixes https://github.com/jazzband/django-debug-toolbar/issues/799.

TODO:

• [ ] cleanup (consistent naming)
• [x] test(s)

[codecov[bot]]

Codecov Report

Merging #982 into master will decrease coverage by 2.41%. The diff coverage is 78.57%.

@@            Coverage Diff             @@
##           master     #982      +/-   ##
==========================================
- Coverage   83.46%   81.04%   -2.42%     
==========================================
  Files          28       28              
  Lines        1578     1583       +5     
  Branches      235      236       +1     
==========================================
- Hits         1317     1283      -34     
- Misses        192      221      +29     
- Partials       69       79      +10

Impacted Files	Coverage Δ
debug_toolbar/panels/cache.py	74.41% <78.57%> (-7.04%)	:arrow_down:
debug_toolbar/compat.py	50% <0%> (-50%)	:arrow_down:
debug_toolbar/management/commands/__init__.py	66.66% <0%> (-16.67%)	:arrow_down:
debug_toolbar/panels/sql/utils.py	70.65% <0%> (-13.18%)	:arrow_down:
debug_toolbar/panels/headers.py	95.45% <0%> (-4.55%)	:arrow_down:
debug_toolbar/panels/templates/panel.py	86.4% <0%> (-1.6%)	:arrow_down:

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[codecov[bot]]

Codecov Report

Merging #982 into master will decrease coverage by <.01%. The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master     #982      +/-   ##
==========================================
- Coverage   83.46%   83.45%   -0.01%     
==========================================
  Files          28       28              
  Lines        1578     1584       +6     
  Branches      235      237       +2     
==========================================
+ Hits         1317     1322       +5     
- Misses        192      193       +1     
  Partials       69       69

Impacted Files	Coverage Δ
debug_toolbar/panels/cache.py	81.53% <93.33%> (+0.08%)	:arrow_up:

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[matthiask]

This might work, but looks really really evil :-/

[blueyed]

Maybe https://github.com/jazzband/django-debug-toolbar/pull/800 would be less intrusive then? I was not aware that I did another PR already when doing this one..

[camilonova]

@blueyed could you please update this PR and fix the conflicts?

[blueyed]

Would be good to get a go considering its "evil-ness" before. /cc @matthiask @aaugustin

[aaugustin]

Aside from a general feeling that this could cause issues, I don't have a strong opinion on this. If you're ready to support users after this change, you can merge it.

[matthiask]

The relevant code has changed a lot in this area. Please resubmit if you still want to work on this. Thanks in advance!