Django snippets

from functools import wraps

def RequestMiddleware(middleware_func):
    """ RequestMiddleware """

    @wraps(middleware_func)
    def middleware(view_func):
        """ middleware """

        @wraps(view_func)
        def new_view_func(request, *args, **kwargs ):
            """ new_view_func """

            middleware_func(request, *args, **kwargs)

            return view_func(request, *args, **kwargs)
        return new_view_func
    return middleware


def ResponseMiddleware(middleware_func):
    """ ResponseMiddleware """

    @wraps(middleware_func)
    def middleware(view_func):
        """ middleware """

        @wraps(view_func)
        def new_view_func(request, *args, **kwargs ):
            """ new_view_func """

            response = view_func(request, *args, **kwargs)

            middleware_func(request, response, *args, **kwargs)

            return response
        return new_view_func
    return middleware


def ExceptionMiddleware(middleware_func):
    """ ExceptionMiddleware """

    @wraps(middleware_func)
    def middleware(view_func):
        """ middleware """

        @wraps(view_func)
        def new_view_func(request, *args, **kwargs ):
            """ new_view_func """

            try:
                response = view_func(request, *args, **kwargs)
            except Exception, e:
                response = middleware_func(request, e, *args, **kwargs)

            if response is None:
                raise

            return response
        return new_view_func
    return middleware