# Copyright 2021-2023 H2020 TeraFlow (https://www.teraflow-h2020.eu/) # # Licensed under the Apache License, Version 2.0 (the "License"); # you may not use this file except in compliance with the License. # You may obtain a copy of the License at # # http://www.apache.org/licenses/LICENSE-2.0 # # Unless required by applicable law or agreed to in writing, software # distributed under the License is distributed on an "AS IS" BASIS, # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. # See the License for the specific language governing permissions and # limitations under the License. import grpc, json, logging, requests, uuid from typing import List from common.proto.context_pb2 import Connection, Empty, EndPointId from common.proto.pathcomp_pb2 import PathCompReply, PathCompRequest from common.proto.pathcomp_pb2_grpc import PathCompServiceServicer from common.rpc_method_wrapper.Decorator import create_metrics, safe_and_metered_rpc_method from common.tools.grpc.Tools import grpc_message_to_json, grpc_message_to_json_string from context.client.ContextClient import ContextClient from pathcomp.frontend.Config import BACKEND_HOST, BACKEND_PORT, BACKEND_URL from pathcomp.frontend.service.tools.ComposeRequest import compose_device, compose_link, compose_service LOGGER = logging.getLogger(__name__) SERVICE_NAME = 'PathComp' METHOD_NAMES = ['Compute'] METRICS = create_metrics(SERVICE_NAME, METHOD_NAMES) class PathCompServiceServicerImpl(PathCompServiceServicer): def __init__(self) -> None: LOGGER.debug('Creating Servicer...') LOGGER.debug('Servicer Created') @safe_and_metered_rpc_method(METRICS, LOGGER) def Compute(self, request : PathCompRequest, context : grpc.ServicerContext) -> PathCompReply: LOGGER.info('[Compute] begin ; request = {:s}'.format(grpc_message_to_json_string(request))) algorithm = request.WhichOneof('algorithm') if algorithm == 'shortest_path': # no attributes pass elif algorithm == 'k_shortest_path': k_inspection = request.k_shortest_path.k_inspection k_return = request.k_shortest_path.k_return else: raise NotImplementedError('Unsupported Algorithm: {:s}'.format(str(algorithm))) context_client = ContextClient() algorithm = {'id': 'KSP', 'sync': False, 'k_paths': k_return} service_list = [ compose_service(grpc_service, algorithm) for grpc_service in request.services ] # TODO: consider filtering resources #grpc_contexts = context_client.ListContexts(Empty()) #for grpc_context in grpc_contexts.contexts: # # TODO: add context to request # grpc_topologies = context_client.ListTopologies(grpc_context.context_id) # for grpc_topology in grpc_topologies.topologies: #pylint: disable=unused-variable # # TODO: add topology to request # pass grpc_devices = context_client.ListDevices(Empty()) device_list = [ compose_device(grpc_device) for grpc_device in grpc_devices.devices ] grpc_links = context_client.ListLinks(Empty()) link_list = [ compose_link(grpc_link) for grpc_link in grpc_links.links ] request = { 'serviceList': service_list, 'deviceList' : device_list, 'linkList' : link_list, } backend_url = BACKEND_URL.format(BACKEND_HOST, BACKEND_PORT) reply = requests.post(backend_url, json=request) if reply.status_code not in {requests.codes.ok}: raise Exception('Backend error({:s}) for request({:s})'.format( str(reply.content.decode('UTF-8')), json.dumps(request, sort_keys=True))) LOGGER.info('status_code={:s} reply={:s}'.format( str(reply.status_code), str(reply.content.decode('UTF-8')))) reply = PathCompReply() # TODO: compose reply populating reply.services and reply.connections for service in request.services: # TODO: implement support for multi-point services service_endpoint_ids = service.service_endpoint_ids if len(service_endpoint_ids) != 2: raise NotImplementedError('Service must have 2 endpoints') a_endpoint_id, z_endpoint_id = service_endpoint_ids[0], service_endpoint_ids[-1] connection_uuid = str(uuid.uuid4()) connection_path_hops : List[EndPointId] = [] connection_path_hops.extend([ grpc_message_to_json(a_endpoint_id), grpc_message_to_json(z_endpoint_id), ]) connection = Connection(**{ 'connection_id': {'connection_uuid': {'uuid': connection_uuid}}, 'service_id': grpc_message_to_json(service.service_id), 'path_hops_endpoint_ids': connection_path_hops, 'sub_service_ids': [], }) reply.connections.append(connection) #pylint: disable=no-member reply.services.append(service) #pylint: disable=no-member LOGGER.info('[Compute] end ; reply = {:s}'.format(grpc_message_to_json_string(reply))) return reply