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import grpc, logging
from concurrent import futures
from grpc_health.v1.health import HealthServicer, OVERALL_HEALTH
from grpc_health.v1.health_pb2 import HealthCheckResponse
from grpc_health.v1.health_pb2_grpc import add_HealthServicer_to_server
from compute.proto.compute_pb2_grpc import add_ComputeServiceServicer_to_server
from compute.service.ComputeServiceServicerImpl import ComputeServiceServicerImpl
from compute.Config import GRPC_SERVICE_PORT, GRPC_MAX_WORKERS, GRPC_GRACE_PERIOD
BIND_ADDRESS = '0.0.0.0'
LOGGER = logging.getLogger(__name__)
class ComputeService:
def __init__(self, address=BIND_ADDRESS, port=GRPC_SERVICE_PORT, max_workers=GRPC_MAX_WORKERS,
grace_period=GRPC_GRACE_PERIOD):
self.address = address
self.port = port
self.endpoint = None
self.max_workers = max_workers
self.grace_period = grace_period
self.compute_servicer = None
self.health_servicer = None
self.pool = None
self.server = None
def start(self):
self.endpoint = '{}:{}'.format(self.address, self.port)
LOGGER.debug('Starting Service (tentative endpoint: {}, max_workers: {})...'.format(
self.endpoint, self.max_workers))
self.pool = futures.ThreadPoolExecutor(max_workers=self.max_workers)
self.server = grpc.server(self.pool) # , interceptors=(tracer_interceptor,))
self.compute_servicer = ComputeServiceServicerImpl()
add_ComputeServiceServicer_to_server(self.compute_servicer, self.server)
self.health_servicer = HealthServicer(
experimental_non_blocking=True, experimental_thread_pool=futures.ThreadPoolExecutor(max_workers=1))
add_HealthServicer_to_server(self.health_servicer, self.server)
port = self.server.add_insecure_port(self.endpoint)
self.endpoint = '{}:{}'.format(self.address, port)
LOGGER.info('Listening on {}...'.format(self.endpoint))
self.server.start()
self.health_servicer.set(OVERALL_HEALTH, HealthCheckResponse.SERVING) # pylint: disable=maybe-no-member
LOGGER.debug('Service started')
def stop(self):
LOGGER.debug('Stopping service (grace period {} seconds)...'.format(self.grace_period))
self.health_servicer.enter_graceful_shutdown()
self.server.stop(self.grace_period)
LOGGER.debug('Service stopped')