def _setup_ext_routes(self, mapper, ext_mgr, init_only):
        for resource in ext_mgr.get_resources():
            LOG.debug('Extending resource: %s',
                      resource.collection)

            if init_only is not None and resource.collection not in init_only:
                continue

            inherits = None
            if resource.inherits:
                inherits = self.resources.get(resource.inherits)
                if not resource.controller:
                    resource.controller = inherits.controller
            wsgi_resource = wsgi.Resource(resource.controller,
                                          inherits=inherits)
            self.resources[resource.collection] = wsgi_resource
            kargs = dict(
                controller=wsgi_resource,
                collection=resource.collection_actions,
                member=resource.member_actions)

            if resource.parent:
                kargs['parent_resource'] = resource.parent

            mapper.resource(resource.collection, resource.collection, **kargs)

            if resource.custom_routes_fn:
                resource.custom_routes_fn(mapper, wsgi_resource)
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/api/openstack/__init__.py/APIRouter._setup_ext_routes/original