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# 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, 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.proto.load_generator_pb2_grpc import LoadGeneratorServiceStub
from common.tools.client.RetryDecorator import retry, delay_exponential
from common.tools.grpc.Tools import grpc_message_to_json_string
LOGGER = logging.getLogger(__name__)
MAX_RETRIES = 15
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 LoadGeneratorClient:
def __init__(self, host=None, port=None):
if not host: host = get_service_host(ServiceNameEnum.LOAD_GENERATOR)
if not port: port = get_service_port_grpc(ServiceNameEnum.LOAD_GENERATOR)
self.endpoint = '{:s}:{:s}'.format(str(host), str(port))
LOGGER.debug('Creating channel to {:s}...'.format(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 = LoadGeneratorServiceStub(self.channel)
def close(self):
if self.channel is not None: self.channel.close()
self.channel = None
self.stub = None
@RETRY_DECORATOR
def Start(self, request : Empty) -> Empty:
LOGGER.debug('Start request: {:s}'.format(grpc_message_to_json_string(request)))
response = self.stub.Start(request)
LOGGER.debug('Start result: {:s}'.format(grpc_message_to_json_string(response)))
return response
@RETRY_DECORATOR
def Stop(self, request : Empty) -> Empty:
LOGGER.debug('Stop request: {:s}'.format(grpc_message_to_json_string(request)))
response = self.stub.Stop(request)
LOGGER.debug('Stop result: {:s}'.format(grpc_message_to_json_string(response)))
return response