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https://issues.apache.org/jira/browse/PROTON-2095?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17037814#comment-17037814
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Omer Katz commented on PROTON-2095:
-----------------------------------
Because CFFI works better with PyPy. See
[https://doc.pypy.org/en/latest/extending.html#cffi] and
[https://morepypy.blogspot.com/2018/09/inside-cpyext-why-emulating-cpython-c.html].
In the future, the [HPy
project|[https://morepypy.blogspot.com/2019/12/hpy-kick-off-sprint-report.html]]
will allow writing C extensions for both CPython & PyPy. It is possible that
Cython will be able to emit such API calls as well.
However, we can't rely on future promises and more importantly it doesn't seem
we have a lot of custom C code for the binding and we're simply calling the C
library so there's no reason to use something as complicated as Cython or
pybind11.
CFFI is good enough and will be easy to use which reduces contribution friction.
> Move away from SWIG to CFFI
> ---------------------------
>
> Key: PROTON-2095
> URL: https://issues.apache.org/jira/browse/PROTON-2095
> Project: Qpid Proton
> Issue Type: Wish
> Components: python-binding
> Affects Versions: proton-c-0.29.0, proton-c-future
> Reporter: Omer Katz
> Priority: Major
> Fix For: proton-c-future
>
>
> SWIG is fine but we're not using it for anything other than exporting all of
> proton-c's API as is.
> Unfortunately SWIG only generates CPython extension bindings. This may be a
> problem on PyPy where CPython extensions are either slow or simply won't
> compile.
> Unlike SWIG, CFFI is portable both on CPython and PyPy.
> It also satisfies the same requirements as SWIG currently does.
> In addition, calls to CFFI simply release the GIL which will help
> parallelizing Python applications using threads.
> By using CFFI we can also get rid of all of our setup.py code and simply use
> it to build the extension. We will also no longer have problems building
> wheels.
> The newest version of CFFI supports pkg-config so we can use that to find
> proton-c easily.
> I'm willing to help with the refactor but I'll need a mentor since I'm not
> familiar with the code base.
>
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