| # Copyright 2017 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. |
| """Tests that a channel will reconnect if a connection is dropped""" |
| |
| import socket |
| import unittest |
| |
| import grpc |
| from grpc.framework.foundation import logging_pool |
| |
| from tests.unit.framework.common import test_constants |
| |
| _REQUEST = b'\x00\x00\x00' |
| _RESPONSE = b'\x00\x00\x01' |
| |
| _UNARY_UNARY = '/test/UnaryUnary' |
| |
| |
| def _handle_unary_unary(unused_request, unused_servicer_context): |
| return _RESPONSE |
| |
| |
| def _get_reuse_socket_option(): |
| try: |
| return socket.SO_REUSEPORT |
| except AttributeError: |
| # SO_REUSEPORT is unavailable on Windows, but SO_REUSEADDR |
| # allows forcibly re-binding to a port |
| return socket.SO_REUSEADDR |
| |
| |
| def _pick_and_bind_port(sock_opt): |
| # Reserve a port, when we restart the server we want |
| # to hold onto the port |
| port = 0 |
| for address_family in (socket.AF_INET6, socket.AF_INET): |
| try: |
| s = socket.socket(address_family, socket.SOCK_STREAM) |
| except socket.error: |
| continue # this address family is unavailable |
| s.setsockopt(socket.SOL_SOCKET, sock_opt, 1) |
| try: |
| s.bind(('localhost', port)) |
| # for socket.SOCK_STREAM sockets, it is necessary to call |
| # listen to get the desired behavior. |
| s.listen(1) |
| port = s.getsockname()[1] |
| except socket.error: |
| # port was not available on the current address family |
| # try again |
| port = 0 |
| break |
| finally: |
| s.close() |
| if s: |
| return port if port != 0 else _pick_and_bind_port(sock_opt) |
| else: |
| return None # no address family was available |
| |
| |
| class ReconnectTest(unittest.TestCase): |
| |
| def test_reconnect(self): |
| server_pool = logging_pool.pool(test_constants.THREAD_CONCURRENCY) |
| handler = grpc.method_handlers_generic_handler('test', { |
| 'UnaryUnary': |
| grpc.unary_unary_rpc_method_handler(_handle_unary_unary) |
| }) |
| sock_opt = _get_reuse_socket_option() |
| port = _pick_and_bind_port(sock_opt) |
| self.assertIsNotNone(port) |
| |
| server = grpc.server(server_pool, (handler,)) |
| server.add_insecure_port('[::]:{}'.format(port)) |
| server.start() |
| channel = grpc.insecure_channel('localhost:%d' % port) |
| multi_callable = channel.unary_unary(_UNARY_UNARY) |
| self.assertEqual(_RESPONSE, multi_callable(_REQUEST)) |
| server.stop(None) |
| server = grpc.server(server_pool, (handler,)) |
| server.add_insecure_port('[::]:{}'.format(port)) |
| server.start() |
| self.assertEqual(_RESPONSE, multi_callable(_REQUEST)) |
| |
| |
| if __name__ == '__main__': |
| unittest.main(verbosity=2) |