I agree we should use flake8 built-in if at all possible. I complexity checking 
will definitely help us in the long run keeping code maintainable.

+1 from me. 


—
Morgan Fainberg


On October 16, 2014 at 20:45:35, Joe Gordon (joe.gord...@gmail.com) wrote:
> On Thu, Oct 16, 2014 at 8:11 PM, Angus Salkeld  
> wrote:
>  
> > Hi all
> >
> > I came across some tools [1] & [2] that we could use to make sure we don't
> > increase our code complexity.
> >
> > Has anyone had any experience with these or other tools?
> >
>  
>  
> Flake8 (and thus hacking) has built in McCabe Complexity checking.
>  
> flake8 --select=C --max-complexity 10
>  
> https://github.com/flintwork/mccabe
> http://flake8.readthedocs.org/en/latest/warnings.html
>  
> Example on heat: http://paste.openstack.org/show/121561
> Example in nova (max complexity of 20):
> http://paste.openstack.org/show/121562
>  
>  
> >
> > radon is the underlying reporting tool and xenon is a "monitor" - meaning
> > it will fail if a threshold is reached.
> >
> > To save you the time:
> > radon cc -nd heat
> > heat/engine/stack.py
> > M 809:4 Stack.delete - E
> > M 701:4 Stack.update_task - D
> > heat/engine/resources/server.py
> > M 738:4 Server.handle_update - D
> > M 891:4 Server.validate - D
> > heat/openstack/common/jsonutils.py
> > F 71:0 to_primitive - D
> > heat/openstack/common/config/generator.py
> > F 252:0 _print_opt - D
> > heat/tests/v1_1/fakes.py
> > M 240:4 FakeHTTPClient.post_servers_1234_action - F
> >
> > It ranks the complexity from A (best) upwards, the command above (-nd)
> > says only show D or worse.
> > If you look at these methods they are getting out of hand and are
> > becoming difficult to understand.
> > I like the idea of having a threshold that says we are not going to just
> > keep adding to the complexity
> > of these methods.
> >
> > This can be enforced with:
> > xenon --max-absolute E heat
> > ERROR:xenon:block "heat/tests/v1_1/fakes.py:240 post_servers_1234_action"  
> > has a rank of F
> >
> > [1] https://pypi.python.org/pypi/radon
> > [2] https://pypi.python.org/pypi/xenon
> >
> > If people are open to this, I'd like to add these to the test-requirements
> > and trial this in Heat
> > (as part of the pep8 tox target).
> >
>  
> I think the idea of gating on complexity is a great idea and would like to
> see nova adopt this as well. But why not just use flake8's built in stuff?
>  
>  
> >
> > Regards
> > Angus
> >
> > _______________________________________________
> > OpenStack-dev mailing list
> > OpenStack-dev@lists.openstack.org
> > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
> >
> >
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>  


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