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# Copyright 2025-present MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Test that the asynchronous API does not block the event loop."""
from __future__ import annotations
import asyncio
import time
from test.asynchronous import AsyncIntegrationTest
from pymongo.errors import ServerSelectionTimeoutError
class TestClientLoopUnblocked(AsyncIntegrationTest):
async def test_client_does_not_block_loop(self):
# Use an unreachable TEST-NET host to ensure that the client times out attempting to create a connection.
client = self.simple_client("192.0.2.1", serverSelectionTimeoutMS=500)
latencies = []
# If the loop is being blocked, at least one iteration will have a latency much more than 0.1 seconds
async def background_task():
start = time.monotonic()
try:
while True:
start = time.monotonic()
await asyncio.sleep(0.1)
latencies.append(time.monotonic() - start)
except asyncio.CancelledError:
latencies.append(time.monotonic() - start)
raise
t = asyncio.create_task(background_task())
with self.assertRaisesRegex(ServerSelectionTimeoutError, "No servers found yet"):
await client.admin.command("ping")
t.cancel()
with self.assertRaises(asyncio.CancelledError):
await t
self.assertLessEqual(
sorted(latencies, reverse=True)[0],
1.0,
"Background task was blocked from running",
)
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