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# Copyright 2018 gRPC authors.
#
# 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.
"""Defines a number of module-scope gRPC scenarios to test server shutdown."""
import argparse
import os
import threading
import time
import logging
import grpc
from tests.unit import test_common
from concurrent import futures
from six.moves import queue
WAIT_TIME = 1000
REQUEST = b'request'
RESPONSE = b'response'
SERVER_RAISES_EXCEPTION = 'server_raises_exception'
SERVER_DEALLOCATED = 'server_deallocated'
SERVER_FORK_CAN_EXIT = 'server_fork_can_exit'
FORK_EXIT = '/test/ForkExit'
def fork_and_exit(request, servicer_context):
pid = os.fork()
if pid == 0:
os._exit(0)
return RESPONSE
class GenericHandler(grpc.GenericRpcHandler):
def service(self, handler_call_details):
if handler_call_details.method == FORK_EXIT:
return grpc.unary_unary_rpc_method_handler(fork_and_exit)
else:
return None
def run_server(port_queue):
server = test_common.test_server()
port = server.add_insecure_port('[::]:0')
port_queue.put(port)
server.add_generic_rpc_handlers((GenericHandler(),))
server.start()
# threading.Event.wait() does not exhibit the bug identified in
# https://github.com/grpc/grpc/issues/17093, sleep instead
time.sleep(WAIT_TIME)
def run_test(args):
if args.scenario == SERVER_RAISES_EXCEPTION:
server = test_common.test_server()
server.start()
raise Exception()
elif args.scenario == SERVER_DEALLOCATED:
server = test_common.test_server()
server.start()
server.__del__()
while server._state.stage != grpc._server._ServerStage.STOPPED:
pass
elif args.scenario == SERVER_FORK_CAN_EXIT:
port_queue = queue.Queue()
thread = threading.Thread(target=run_server, args=(port_queue,))
thread.daemon = True
thread.start()
port = port_queue.get()
channel = grpc.insecure_channel('localhost:%d' % port)
multi_callable = channel.unary_unary(FORK_EXIT)
result, call = multi_callable.with_call(REQUEST, wait_for_ready=True)
os.wait()
else:
raise ValueError('unknown test scenario')
if __name__ == '__main__':
logging.basicConfig()
parser = argparse.ArgumentParser()
parser.add_argument('scenario', type=str)
args = parser.parse_args()
run_test(args)
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