时在中春，阳和方起。阳和：春天的暖气。有时候，所有风景只为一个路人，或一个路过的人。一如那最初的爱情。
工作中遇到一个问题，上游服务通过grpc调用下游服务，但是由于下游服务负载太高导致上游服务的调用会随机出现超时的情况，但是有一点不太明确：超时之后，下游服务还会继续进行计算么？
于是自己写了一个damon试了一下：
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()
这两个例子就是在grpc官方提供的python例子上做了一下小的改动，得到的结果是：当client超时报错退出之后，server还是会继续进行计算，直到结束，那如果是这样的话，超时的机制对于server来说是没有作用的，即使client已经不再等待这个结果了，但是server还是会继续计算，浪费server的资源。
本文Python grpc超时机制代码示例到此结束。在我们的记忆中，每一次“错过”都是完美的：或是浪漫的情感历程，或是平步青云的官运，或是唾手可得的财气。但同时，我们也许错过了疾病，错过了灾难，错过了失败，错过了与己无益的是与非。所以，不必为错过叹息，因为在叹息中，我们又将错过今日的完美。小编再次感谢大家对我们的支持！
