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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.
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import logging, signal, sys, threading
from prometheus_client import start_http_server
from common.Constants import ServiceNameEnum
from common.Settings import (
ENVVAR_SUFIX_SERVICE_HOST, ENVVAR_SUFIX_SERVICE_PORT_GRPC, get_env_var_name, get_log_level, get_metrics_port,
wait_for_environment_variables)
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from qkd_app.service.QKDAppService import AppService
from qkd_app.service.rest_server.RestServer import RestServer
from qkd_app.service.rest_server.qkd_app import register_qkd_app
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from common.message_broker.Factory import get_messagebroker_backend
from common.message_broker.MessageBroker import MessageBroker
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from qkd_app.service.database.Engine import Engine
from qkd_app.service.database.models._Base import rebuild_database
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terminate = threading.Event()
LOGGER : logging.Logger = None
def signal_handler(signal, frame): # pylint: disable=redefined-outer-name
LOGGER.warning('Terminate signal received')
terminate.set()
def main():
global LOGGER # pylint: disable=global-statement
log_level = get_log_level()
logging.basicConfig(level=log_level, format="[%(asctime)s] %(levelname)s:%(name)s:%(message)s")
LOGGER = logging.getLogger(__name__)
wait_for_environment_variables([
get_env_var_name(ServiceNameEnum.CONTEXT, ENVVAR_SUFIX_SERVICE_HOST ),
get_env_var_name(ServiceNameEnum.CONTEXT, ENVVAR_SUFIX_SERVICE_PORT_GRPC),
])
signal.signal(signal.SIGINT, signal_handler)
signal.signal(signal.SIGTERM, signal_handler)
LOGGER.info('Starting...')
# Start metrics server
metrics_port = get_metrics_port()
start_http_server(metrics_port)
# Get Database Engine instance and initialize database, if needed
LOGGER.info('Getting SQLAlchemy DB Engine...')
db_engine = Engine.get_engine()
if db_engine is None:
LOGGER.error('Unable to get SQLAlchemy DB Engine...')
return -1
try:
Engine.create_database(db_engine)
except: # pylint: disable=bare-except # pragma: no cover
LOGGER.exception('Failed to check/create the database: {:s}'.format(str(db_engine.url)))
rebuild_database(db_engine)
# Get message broker instance
messagebroker = None #MessageBroker(get_messagebroker_backend())
# Starting context service
grpc_service = AppService(db_engine, messagebroker)
grpc_service.start()
rest_server = RestServer()
register_qkd_app(rest_server)
rest_server.start()
# Wait for Ctrl+C or termination signal
while not terminate.wait(timeout=1.0): pass
LOGGER.info('Terminating...')
grpc_service.stop()
rest_server.shutdown()
rest_server.join()
LOGGER.info('Bye')
return 0
if __name__ == '__main__':
sys.exit(main())