57 lines
2.0 KiB
Python
57 lines
2.0 KiB
Python
# Copyright 2025-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 the asynchronous API does not block the event loop."""
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from __future__ import annotations
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import asyncio
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import time
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from test.asynchronous import AsyncIntegrationTest
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from pymongo.errors import ServerSelectionTimeoutError
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class TestClientLoopUnblocked(AsyncIntegrationTest):
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async def test_client_does_not_block_loop(self):
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# Use an unreachable TEST-NET host to ensure that the client times out attempting to create a connection.
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client = self.simple_client("192.0.2.1", serverSelectionTimeoutMS=500)
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latencies = []
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# If the loop is being blocked, at least one iteration will have a latency much more than 0.1 seconds
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async def background_task():
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start = time.monotonic()
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try:
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while True:
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start = time.monotonic()
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await asyncio.sleep(0.1)
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latencies.append(time.monotonic() - start)
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except asyncio.CancelledError:
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latencies.append(time.monotonic() - start)
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raise
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t = asyncio.create_task(background_task())
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with self.assertRaisesRegex(ServerSelectionTimeoutError, "No servers found yet"):
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await client.admin.command("ping")
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t.cancel()
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with self.assertRaises(asyncio.CancelledError):
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await t
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self.assertLessEqual(
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sorted(latencies, reverse=True)[0],
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1.0,
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"Background task was blocked from running",
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)
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