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 
16 import ast
17 import logging
18 import math
19 import os
20 import re
21 import subprocess
22 import tempfile
23 import unittest
24 
25 _BINARY_DIR = os.path.realpath(
26     os.path.join(os.path.dirname(os.path.abspath(__file__)), "..")
27 )
28 _SERVER_PATH = os.path.join(_BINARY_DIR, "server")
29 _CLIENT_PATH = os.path.join(_BINARY_DIR, "client")
30 
31 
32 def is_prime(n):
33     for i in range(2, int(math.ceil(math.sqrt(n)))):
34         if n % i == 0:
35             return False
36     else:
37         return True
38 
39 
40 def _get_server_address(server_stream):
41     while True:
42         server_stream.seek(0)
43         line = server_stream.readline()
44         while line:
45             matches = re.search("Binding to '(.+)'", line)
46             if matches is not None:
47                 return matches.groups()[0]
48             line = server_stream.readline()
49 
50 
51 class MultiprocessingExampleTest(unittest.TestCase):
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             (
59                 _CLIENT_PATH,
60                 server_address,
61             ),
62             stdout=client_stdout,
63         )
64         client_process.wait()
65         server_process.terminate()
66         client_stdout.seek(0)
67         results = ast.literal_eval(client_stdout.read().strip().split("\n")[-1])
68         values = tuple(result[0] for result in results)
69         self.assertSequenceEqual(range(2, 10000), values)
70         for result in results:
71             self.assertEqual(is_prime(result[0]), result[1])
72 
73 
74 if __name__ == "__main__":
75     logging.basicConfig()
76     unittest.main(verbosity=2)
77