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1# Copyright 2021 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
15import gevent
16from gevent import monkey
17
18monkey.patch_all()
19threadpool = gevent.hub.get_hub().threadpool
20
21# Currently, each channel corresponds to a single native thread in the
22# gevent threadpool. Thus, when the unit test suite spins up hundreds of
23# channels concurrently, some will be starved out, causing the test to
24# increase in duration. We increase the max size here so this does not
25# happen.
26threadpool.maxsize = 1024
27threadpool.size = 32
28
29import traceback, signal
30from typing import Sequence
31
32
33import grpc.experimental.gevent
34grpc.experimental.gevent.init_gevent()
35
36import gevent
37import greenlet
38import datetime
39
40import grpc
41import unittest
42import sys
43import os
44import pkgutil
45
46def trace_callback(event, args):
47    if event in ("switch", "throw"):
48        origin, target = args
49        sys.stderr.write("{} Transfer from {} to {} with {}\n".format(datetime.datetime.now(), origin, target, event))
50    else:
51        sys.stderr.write("Unknown event {}.\n".format(event))
52    sys.stderr.flush()
53
54if os.getenv("GREENLET_TRACE") is not None:
55    greenlet.settrace(trace_callback)
56
57def debug(sig, frame):
58    d={'_frame':frame}
59    d.update(frame.f_globals)
60    d.update(frame.f_locals)
61
62    sys.stderr.write("Traceback:\n{}".format("\n".join(traceback.format_stack(frame))))
63    import gevent.util; gevent.util.print_run_info()
64    sys.stderr.flush()
65
66signal.signal(signal.SIGTERM, debug)
67
68
69class SingleLoader(object):
70    def __init__(self, pattern: str):
71        loader = unittest.TestLoader()
72        self.suite = unittest.TestSuite()
73        tests = []
74        for importer, module_name, is_package in pkgutil.walk_packages([os.path.dirname(os.path.relpath(__file__))]):
75            if pattern in module_name:
76                module = importer.find_module(module_name).load_module(module_name)
77                tests.append(loader.loadTestsFromModule(module))
78        if len(tests) != 1:
79            raise AssertionError("Expected only 1 test module. Found {}".format(tests))
80        self.suite.addTest(tests[0])
81
82
83    def loadTestsFromNames(self, names: Sequence[str], module: str = None) -> unittest.TestSuite:
84        return self.suite
85
86if __name__ == "__main__":
87
88    if len(sys.argv) != 2:
89        print(f"USAGE: {sys.argv[0]} TARGET_MODULE", file=sys.stderr)
90
91    target_module = sys.argv[1]
92
93    loader = SingleLoader(target_module)
94    runner = unittest.TextTestRunner()
95
96    result = gevent.spawn(runner.run, loader.suite)
97    result.join()
98    if not result.value.wasSuccessful():
99        sys.exit("Test failure.")
100