179efda312
Log child process C-level stacks when fork tests deadlock. Encode hostname to bytes to avoid getaddrinfo importlib deadlock.
93 lines
3.0 KiB
Python
93 lines
3.0 KiB
Python
# Copyright 2022-present MongoDB, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""Test that pymongo resets its own locks after a fork."""
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import os
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import sys
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import unittest
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from multiprocessing import Pipe
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sys.path[0:0] = [""]
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from test import IntegrationTest
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from test.utils import is_greenthread_patched
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from bson.objectid import ObjectId
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@unittest.skipIf(
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not hasattr(os, "register_at_fork"), "register_at_fork not available in this version of Python"
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)
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@unittest.skipIf(
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is_greenthread_patched(),
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"gevent and eventlet do not support POSIX-style forking.",
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)
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class TestFork(IntegrationTest):
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def test_lock_client(self):
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# Forks the client with some items locked.
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# Parent => All locks should be as before the fork.
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# Child => All locks should be reset.
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with self.client._MongoClient__lock:
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def target():
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self.client.admin.command("ping")
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with self.fork(target):
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pass
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self.client.admin.command("ping")
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def test_lock_object_id(self):
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# Forks the client with ObjectId's _inc_lock locked.
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# Parent => _inc_lock should remain locked.
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# Child => _inc_lock should be unlocked.
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with ObjectId._inc_lock:
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def target():
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self.assertFalse(ObjectId._inc_lock.locked())
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self.assertTrue(ObjectId())
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with self.fork(target):
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pass
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def test_topology_reset(self):
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# Tests that topologies are different from each other.
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# Cannot use ID because virtual memory addresses may be the same.
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# Cannot reinstantiate ObjectId in the topology settings.
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# Relies on difference in PID when opened again.
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parent_conn, child_conn = Pipe()
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init_id = self.client._topology._pid
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parent_cursor_exc = self.client._kill_cursors_executor
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def target():
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self.client.admin.command("ping")
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child_conn.send(self.client._topology._pid)
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child_conn.send(
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(
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parent_cursor_exc != self.client._kill_cursors_executor,
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"client._kill_cursors_executor was not reinitialized",
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)
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)
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with self.fork(target):
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self.assertEqual(self.client._topology._pid, init_id)
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child_id = parent_conn.recv()
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self.assertNotEqual(child_id, init_id)
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passed, msg = parent_conn.recv()
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self.assertTrue(passed, msg)
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if __name__ == "__main__":
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unittest.main()
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