1# Copyright 2017 gRPC authors. 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14"""Tests that a channel will reconnect if a connection is dropped""" 15 16import logging 17import socket 18import time 19import unittest 20 21import grpc 22from grpc.framework.foundation import logging_pool 23 24from tests.unit.framework.common import bound_socket 25from tests.unit.framework.common import test_constants 26 27_REQUEST = b"\x00\x00\x00" 28_RESPONSE = b"\x00\x00\x01" 29 30_UNARY_UNARY = "/test/UnaryUnary" 31 32 33def _handle_unary_unary(unused_request, unused_servicer_context): 34 return _RESPONSE 35 36 37class ReconnectTest(unittest.TestCase): 38 def test_reconnect(self): 39 server_pool = logging_pool.pool(test_constants.THREAD_CONCURRENCY) 40 handler = grpc.method_handlers_generic_handler( 41 "test", 42 { 43 "UnaryUnary": grpc.unary_unary_rpc_method_handler( 44 _handle_unary_unary 45 ) 46 }, 47 ) 48 options = (("grpc.so_reuseport", 1),) 49 with bound_socket() as (host, port): 50 addr = "{}:{}".format(host, port) 51 server = grpc.server(server_pool, (handler,), options=options) 52 server.add_insecure_port(addr) 53 server.start() 54 channel = grpc.insecure_channel(addr) 55 multi_callable = channel.unary_unary( 56 _UNARY_UNARY, 57 _registered_method=True, 58 ) 59 self.assertEqual(_RESPONSE, multi_callable(_REQUEST)) 60 server.stop(None) 61 # By default, the channel connectivity is checked every 5s 62 # GRPC_CLIENT_CHANNEL_BACKUP_POLL_INTERVAL_MS can be set to change 63 # this. 64 time.sleep(5.1) 65 server = grpc.server(server_pool, (handler,), options=options) 66 server.add_insecure_port(addr) 67 server.start() 68 self.assertEqual(_RESPONSE, multi_callable(_REQUEST)) 69 server.stop(None) 70 channel.close() 71 72 73if __name__ == "__main__": 74 logging.basicConfig() 75 unittest.main(verbosity=2) 76