# Copyright 2022-2023 ETSI TeraFlowSDN - TFS OSG (https://tfs.etsi.org/) # # 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, logging from common.Constants import ServiceNameEnum from common.Settings import get_service_host, get_service_port_grpc from common.proto.context_pb2 import Empty from common.tools.grpc.Tools import grpc_message_to_json_string from common.tools.client.RetryDecorator import retry, delay_exponential from common.proto.telemetry_frontend_pb2_grpc import TelemetryFrontendServiceStub from common.proto.telemetry_frontend_pb2 import Collector, CollectorId, CollectorFilter, CollectorList LOGGER = logging.getLogger(__name__) MAX_RETRIES = 10 DELAY_FUNCTION = delay_exponential(initial=0.01, increment=2.0, maximum=5.0) RETRY_DECORATOR = retry(max_retries=MAX_RETRIES, delay_function=DELAY_FUNCTION, prepare_method_name='connect') class TelemetryFrontendClient: def __init__(self, host=None, port=None): if not host: host = get_service_host(ServiceNameEnum.TELEMETRYFRONTEND) if not port: port = get_service_port_grpc(ServiceNameEnum.TELEMETRYFRONTEND) self.endpoint = '{:s}:{:s}'.format(str(host), str(port)) LOGGER.debug('Creating channel to {:s}...'.format(str(self.endpoint))) self.channel = None self.stub = None self.connect() LOGGER.debug('Channel created') def connect(self): self.channel = grpc.insecure_channel(self.endpoint) self.stub = TelemetryFrontendServiceStub(self.channel) def close(self): if self.channel is not None: self.channel.close() self.channel = None self.stub = None @RETRY_DECORATOR def StartCollector(self, request : Collector) -> CollectorId: # type: ignore LOGGER.debug('StartCollector: {:s}'.format(grpc_message_to_json_string(request))) response = self.stub.StartCollector(request) LOGGER.debug('StartCollector result: {:s}'.format(grpc_message_to_json_string(response))) return response @RETRY_DECORATOR def StopCollector(self, request : CollectorId) -> Empty: # type: ignore LOGGER.debug('StopCollector: {:s}'.format(grpc_message_to_json_string(request))) response = self.stub.StopCollector(request) LOGGER.debug('StopCollector result: {:s}'.format(grpc_message_to_json_string(response))) return response @RETRY_DECORATOR def SelectCollectors(self, request : CollectorFilter) -> CollectorList: # type: ignore LOGGER.debug('SelectCollectors: {:s}'.format(grpc_message_to_json_string(request))) response = self.stub.SelectCollectors(request) LOGGER.debug('SelectCollectors result: {:s}'.format(grpc_message_to_json_string(response))) return response