manager.py 文件源码

def query_resources(self, request):
        """Find and return the resources that answer the client's query.

        Args:
            request (Request): QueryResources request.

        Returns:
            ResourcesReply. a reply containing matching resources.
        """
        desc = ResourceDescriptor.decode(request.message.descriptors)
        self.logger.debug("Looking for resources with description %r", desc)

        # query for resources that are usable and match the descriptors
        query = (Q(is_usable=True, **desc.properties))
        matches = desc.type.objects.filter(query)

        if matches.count() == 0:
            raise ResourceDoesNotExistError("No existing resource meets "
                                            "the requirements: %r" % desc)

        query_result = [resource for resource in matches]

        return ResourcesReply(resources=query_result)