Middleware plugins for a service

middleware.py

from pike.discovery import py


class MiddlewarePlugin(object):
    def __init__(self, config):
        self.config = config

    @classmethod
    def qualified_name(cls):
        __, __, module_name = cls.__module__.rpartition('.')
        return '{}.{}'.format(module_name, cls.__name__)


def get_middleware_plugins(mw_names, inst_kwargs):
    module = py.get_module_by_name('my_service.middleware')
    classes = py.get_all_inherited_classes(module, MiddlewarePlugin)

    loaded_middleware = list(
        mw(**inst_kwargs)
        for name in mw_names
        for mw in classes
        if mw.qualified_name() == name
    )

    return loaded_middleware