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https://github.com/php-win-ext/grpc.git
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8fb51946bf
A closer reading of the API for getsockopt revealed that we were depending on an implementation detail of getsockopt on Linux. This assumption breaks down on MacOS. getsockopt merely guarantees that it will return on 0 in case of failure and a value greater than 0 in case of success. There is no guarantee as to *which* non-zero value you will receive. On Linux, it seems to be 1, the value which was explicitly set. On MacOS, it seems to be the value of the FLAG which was set, i.e. 512 for SO_REUSEPORT. This commit ensures the check we use does not rely on either of these implementation details.
124 lines
3.8 KiB
Python
124 lines
3.8 KiB
Python
# 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 contextlib
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import datetime
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import logging
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import math
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import multiprocessing
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import time
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import socket
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import sys
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import grpc
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from examples.python.multiprocessing import prime_pb2
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from examples.python.multiprocessing import prime_pb2_grpc
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_LOGGER = logging.getLogger(__name__)
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_ONE_DAY = datetime.timedelta(days=1)
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_PROCESS_COUNT = multiprocessing.cpu_count()
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_THREAD_CONCURRENCY = _PROCESS_COUNT
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def is_prime(n):
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for i in range(2, int(math.ceil(math.sqrt(n)))):
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if n % i == 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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_LOGGER.info('Determining primality of %s', request.candidate)
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return prime_pb2.Primality(isPrime=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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"""Start a server in a subprocess."""
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_LOGGER.info('Starting new server.')
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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(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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@contextlib.contextmanager
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def _reserve_port():
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"""Find and reserve a port for all subprocesses to use."""
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sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
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sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
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if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 0:
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raise RuntimeError("Failed to set SO_REUSEPORT.")
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sock.bind(('', 0))
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try:
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yield sock.getsockname()[1]
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finally:
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sock.close()
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def main():
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with _reserve_port() as port:
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bind_address = 'localhost:{}'.format(port)
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_LOGGER.info("Binding to '%s'", bind_address)
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sys.stdout.flush()
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workers = []
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for _ in range(_PROCESS_COUNT):
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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(
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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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handler = logging.StreamHandler(sys.stdout)
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formatter = logging.Formatter('[PID %(process)d] %(message)s')
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handler.setFormatter(formatter)
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_LOGGER.addHandler(handler)
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_LOGGER.setLevel(logging.INFO)
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main()
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