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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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99 lines
2.9 KiB
99 lines
2.9 KiB
6 years ago
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# Copyright 2019 gRPC authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""An example of multiprocess concurrency with gRPC."""
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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from concurrent import futures
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import datetime
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import grpc
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import logging
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import math
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import multiprocessing
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import os
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import time
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import prime_pb2
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import prime_pb2_grpc
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_ONE_DAY = datetime.timedelta(days=1)
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_NUM_PROCESSES = 8
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_THREAD_CONCURRENCY = 10
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_BIND_ADDRESS = '[::]:50051'
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def is_prime(n):
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for i in range(2, math.ceil(math.sqrt(n))):
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if i % n == 0:
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return False
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else:
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return True
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class PrimeChecker(prime_pb2_grpc.PrimeCheckerServicer):
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def check(self, request, context):
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logging.info(
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'[PID {}] Determining primality of {}'.format(
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os.getpid(), request.candidate))
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return is_prime(request.candidate)
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def _wait_forever(server):
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try:
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while True:
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time.sleep(_ONE_DAY.total_seconds())
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except KeyboardInterrupt:
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server.stop(None)
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def _run_server(bind_address):
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logging.warning( '[PID {}] Starting new server.'.format( os.getpid()))
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options = (('grpc.so_reuseport', 1),)
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# WARNING: This example takes advantage of SO_REUSEPORT. Due to the
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# limitations of manylinux1, none of our precompiled Linux wheels currently
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# support this option. (https://github.com/grpc/grpc/issues/18210). To take
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# advantage of this feature, install from source with
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# `pip install grpcio --no-binary grpcio`.
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server = grpc.server(
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futures.ThreadPoolExecutor(
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max_workers=_THREAD_CONCURRENCY,),
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options=options)
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prime_pb2_grpc.add_PrimeCheckerServicer_to_server(PrimeChecker(), server)
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server.add_insecure_port(bind_address)
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server.start()
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_wait_forever(server)
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def main():
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workers = []
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for _ in range(_NUM_PROCESSES):
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# NOTE: It is imperative that the worker subprocesses be forked before
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# any gRPC servers start up. See
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# https://github.com/grpc/grpc/issues/16001 for more details.
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worker = multiprocessing.Process(target=_run_server, args=(_BIND_ADDRESS,))
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worker.start()
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workers.append(worker)
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for worker in workers:
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worker.join()
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if __name__ == "__main__":
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logging.basicConfig()
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main()
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