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1# Copyright 2019 the 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"""Test for multiprocessing example."""
15
16import ast
17import logging
18import math
19import os
20import re
21import subprocess
22import tempfile
23import unittest
24
25_BINARY_DIR = os.path.realpath(
26    os.path.join(os.path.dirname(os.path.abspath(__file__)), '..'))
27_SERVER_PATH = os.path.join(_BINARY_DIR, 'server')
28_CLIENT_PATH = os.path.join(_BINARY_DIR, 'client')
29
30
31def is_prime(n):
32    for i in range(2, int(math.ceil(math.sqrt(n)))):
33        if n % i == 0:
34            return False
35    else:
36        return True
37
38
39def _get_server_address(server_stream):
40    while True:
41        server_stream.seek(0)
42        line = server_stream.readline()
43        while line:
44            matches = re.search('Binding to \'(.+)\'', line)
45            if matches is not None:
46                return matches.groups()[0]
47            line = server_stream.readline()
48
49
50class MultiprocessingExampleTest(unittest.TestCase):
51
52    def test_multiprocessing_example(self):
53        server_stdout = tempfile.TemporaryFile(mode='r')
54        server_process = subprocess.Popen((_SERVER_PATH,), stdout=server_stdout)
55        server_address = _get_server_address(server_stdout)
56        client_stdout = tempfile.TemporaryFile(mode='r')
57        client_process = subprocess.Popen((
58            _CLIENT_PATH,
59            server_address,
60        ),
61                                          stdout=client_stdout)
62        client_process.wait()
63        server_process.terminate()
64        client_stdout.seek(0)
65        results = ast.literal_eval(client_stdout.read().strip().split('\n')[-1])
66        values = tuple(result[0] for result in results)
67        self.assertSequenceEqual(range(2, 10000), values)
68        for result in results:
69            self.assertEqual(is_prime(result[0]), result[1])
70
71
72if __name__ == '__main__':
73    logging.basicConfig()
74    unittest.main(verbosity=2)
75