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# Copyright 2019 the 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.
"""Test for cancellation example."""
import contextlib
import os
import signal
import socket
import subprocess
import unittest
_BINARY_DIR = os.path.realpath(
os.path.join(os.path.dirname(os.path.abspath(__file__)), '..'))
_SERVER_PATH = os.path.join(_BINARY_DIR, 'server')
_CLIENT_PATH = os.path.join(_BINARY_DIR, 'client')
@contextlib.contextmanager
def _get_port():
sock = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT, 1)
if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 0:
raise RuntimeError("Failed to set SO_REUSEPORT.")
sock.bind(('', 0))
try:
yield sock.getsockname()[1]
finally:
sock.close()
def _start_client(server_port,
desired_string,
ideal_distance,
interesting_distance=None):
interesting_distance_args = () if interesting_distance is None else (
'--show-inferior', interesting_distance)
return subprocess.Popen((_CLIENT_PATH, desired_string, '--server',
'localhost:{}'.format(server_port),
'--ideal-distance', str(ideal_distance)) +
interesting_distance_args)
class CancellationExampleTest(unittest.TestCase):
def test_successful_run(self):
with _get_port() as test_port:
server_process = subprocess.Popen(
(_SERVER_PATH, '--port', str(test_port)))
try:
client_process = _start_client(test_port, 'aa', 0)
client_return_code = client_process.wait()
self.assertEqual(0, client_return_code)
self.assertIsNone(server_process.poll())
finally:
server_process.kill()
server_process.wait()
def test_graceful_sigint(self):
with _get_port() as test_port:
server_process = subprocess.Popen(
(_SERVER_PATH, '--port', str(test_port)))
try:
client_process1 = _start_client(test_port, 'aaaaaaaaaa', 0)
client_process1.send_signal(signal.SIGINT)
client_process1.wait()
client_process2 = _start_client(test_port, 'aa', 0)
client_return_code = client_process2.wait()
self.assertEqual(0, client_return_code)
self.assertIsNone(server_process.poll())
finally:
server_process.kill()
server_process.wait()
if __name__ == '__main__':
unittest.main(verbosity=2)
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