Brief introduction of Python grpc timeout mechanism

That's how Linux should learn 2020-11-11 18:23:00
brief introduction python grpc timeout


This article mainly introduces Python grpc Timeout mechanism code example , In this paper, the example code is introduced in detail , It has certain reference learning value for everyone's study or work , Friends in need can refer to

I have a problem at work , Upstream services through grpc Call downstream Services , However, due to the high load of downstream services, the call of upstream services will time out randomly , But one thing is not clear : After the timeout , Will downstream services continue to compute ?

So I wrote a damon Tried it on :

client:
# Copyright 2015 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.
"""The Python implementation of the GRPC helloworld.Greeter client."""
from __future__ import print_function
import logging
import grpc
import helloworld_pb2
import helloworld_pb2_grpc
def run():
# NOTE(gRPC Python Team): .close() is possible on a channel and should be
# used in circumstances in which the with statement does not fit the needs
# of the code.
with grpc.insecure_channel('localhost:50051') as channel:
stub = helloworld_pb2_grpc.GreeterStub(channel)
response = stub.SayHello(helloworld_pb2.HelloRequest(name='you'), timeout=30)
print("Greeter client received: " + response.message)
if __name__ == '__main__':
logging.basicConfig()
run()
server:
# Copyright 2015 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.
"""The Python implementation of the GRPC helloworld.Greeter server."""
from concurrent import futures
import time
import logging
import grpc
import helloworld_pb2
import helloworld_pb2_grpc
_ONE_DAY_IN_SECONDS = 60 * 60 * 24
class Greeter(helloworld_pb2_grpc.GreeterServicer):
def SayHello(self, request, context):
count = 0
while count < 10:
print('time:%s' % (time.time()))
time.sleep(5)
return helloworld_pb2.HelloReply(message='Hello, %s!' % request.name)
def serve():
server = grpc.server(futures.ThreadPoolExecutor(max_workers=10))
helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server)
server.add_insecure_port('[::]:50051')
server.start()
try:
while True:
time.sleep(_ONE_DAY_IN_SECONDS)
except KeyboardInterrupt:
server.stop(0)
if __name__ == '__main__':
logging.basicConfig()
serve()

These two examples are in grpc Official python A small change has been made to the example , And what you get is : When client After the time out by mistake ,server Or will it continue to calculate , Until the end , Well, if that's the case , The timeout mechanism for server It doesn't work , Even if client No longer waiting for this result , however server Or will it continue to count , waste server Resources for .

This paper addresses :https://www.linuxprobe.com/python-grpc-linux.html

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