Patch to support Cython wrapper callables

[piotrmaslanka]

I've tried using Flasgger with endpoints being defined as Cython's defs. The one problem is that Flasgger expects them to have a __dict__, whereas builtins functions and methods don't have one, so I wrapped them in something like this:

class Callable:
    """
    Since Cython compiles defs into builtin_function_of_method which do not have
    a __dict__ this wraps out defs to give them one.
    """
    def __init__(self, fun):
        self.fun = fun
        self.__name__ = fun.__name__
        self.__doc__ = getattr(fun, '__doc__', '')
        self.__wrapped__ = fun

    def __call__(self, *args, **kwargs):
        return self.fun(*args, **kwargs)

While this works in Flask, Flasgger raises a TypeError in the first get_root_path in parse_docstring.
Exactly on the filename = inspect.getfile(obj) line. Sure enough, there are no files to view, since Cython has already compiled everything to a nice .so file.

I've worked out a patch that allows this kinds of usage patterns. The docs run just fine (I've tested it on my corporate-grade project), if anyone should define their endpoints as Cython builtins wrapped by Callable.

And just for the record, yes someone had to abuse Flask and Flasgger this way 🗡️

[piotrmaslanka]

Guys, how about that patch?

[mjTree]

Hello, why did I use this patched version and still get an error after Cython compilation

[piotrmaslanka]

Hello, why did I use this patched version and still get an error after Cython compilation

Could you attach the error message?

[piotrmaslanka]

The views themselves should also be wrapped in following thing:

class Callable:
    """
    Since Cython compiles defs into builtin_function_of_method which do not have
    a __dict__ this wraps out defs to give them one. This is expected by Flasgger.
    """
    def __init__(self, fun):
        self.fun = fun
        self.__name__ = fun.__name__
        self.__doc__ = getattr(fun, '__doc__', '')
        self.__wrapped__ = fun

     def __call__(self, *args, **kwargs):
        return self.fun(*args, **kwargs)