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PYTHON-5488 append_metadata should not add duplicates #2461

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PYTHON-5488 append_metadata should not add duplicates #2461

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ba6d700
PYTHON-5488 `append_metadata` should not add duplicates
sleepyStick Aug 6, 2025
69f5a6a
make it case insensitive
sleepyStick Aug 7, 2025
5e47df3
add none check and refactor test
sleepyStick Aug 8, 2025
30f4ac1
always add |
sleepyStick Aug 11, 2025
a6f43ff
Merge branch 'master' into PYTHON-5488
sleepyStick Aug 11, 2025
c469174
fix test
sleepyStick Aug 11, 2025
a2f0caa
Merge branch 'PYTHON-5488' of https://github.com/sleepyStick/mongo-py…
sleepyStick Aug 11, 2025
b5314ab
simplify logic
sleepyStick Aug 11, 2025
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2 changes: 2 additions & 0 deletions pymongo/pool_options.py
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Original file line number Diff line number Diff line change
Expand Up @@ -386,6 +386,8 @@ def __init__(

def _update_metadata(self, driver: DriverInfo) -> None:
"""Updates the client's metadata"""
if driver.name.lower() in self.__metadata["driver"]["name"].lower().split("|"):
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Need to check for driver.name being None before calling lower().

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the type of DriverInfo.name shouldn't be none. Would the check here be enforcing that the caller is following that rule?

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@NoahStapp NoahStapp Aug 8, 2025 •
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We check on line 393 that driver.name exists, so extending the same check here makes sense. We don't explicitly prevent driver.name from being None, so I'd prefer to err on the safe side to prevent errors being thrown by misbehaving users.

return

metadata = copy.deepcopy(self.__metadata)
if driver.name:
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40 changes: 40 additions & 0 deletions test/asynchronous/test_client_metadata.py
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Expand Up @@ -210,6 +210,46 @@ async def test_doesnt_update_established_connections(self):
self.assertIsNone(self.handshake_req)
self.assertEqual(listener.event_count(ConnectionClosedEvent), 0)

async def test_duplicate_driver_name_no_op(self):
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Can we refactor check_metadata_added to support checking that the new metadata is the same as the old metadata? Most of this method is just duplicate code from check_metadata_added.

client = await self.async_rs_or_single_client(
"mongodb://" + self.server.address_string,
maxIdleTimeMS=1,
)
client.append_metadata(DriverInfo("library", "1.2", "Library Platform"))
# send initial metadata
name, version, platform, metadata = await self.send_ping_and_get_metadata(client, True)
# wait for connection to become idle
await asyncio.sleep(0.005)

# add new metadata
client.append_metadata(DriverInfo("framework", None, None))
new_name, new_version, new_platform, new_metadata = await self.send_ping_and_get_metadata(
client, True
)
self.assertEqual(new_name, f"{name}|framework")
self.assertEqual(new_version, version)
self.assertEqual(new_platform, platform)

metadata.pop("driver")
metadata.pop("platform")
new_metadata.pop("driver")
new_metadata.pop("platform")
self.assertEqual(metadata, new_metadata)

# wait for connection to become idle
await asyncio.sleep(0.005)
# add same metadata again
client.append_metadata(DriverInfo("Framework", None, None))
(
same_name,
same_version,
same_platform,
same_metadata,
) = await self.send_ping_and_get_metadata(client, True)
self.assertEqual(new_name, same_name)
self.assertEqual(new_version, same_version)
self.assertEqual(new_platform, same_platform)


if __name__ == "__main__":
unittest.main()
40 changes: 40 additions & 0 deletions test/test_client_metadata.py
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Expand Up @@ -210,6 +210,46 @@ def test_doesnt_update_established_connections(self):
self.assertIsNone(self.handshake_req)
self.assertEqual(listener.event_count(ConnectionClosedEvent), 0)

def test_duplicate_driver_name_no_op(self):
client = self.rs_or_single_client(
"mongodb://" + self.server.address_string,
maxIdleTimeMS=1,
)
client.append_metadata(DriverInfo("library", "1.2", "Library Platform"))
# send initial metadata
name, version, platform, metadata = self.send_ping_and_get_metadata(client, True)
# wait for connection to become idle
time.sleep(0.005)

# add new metadata
client.append_metadata(DriverInfo("framework", None, None))
new_name, new_version, new_platform, new_metadata = self.send_ping_and_get_metadata(
client, True
)
self.assertEqual(new_name, f"{name}|framework")
self.assertEqual(new_version, version)
self.assertEqual(new_platform, platform)

metadata.pop("driver")
metadata.pop("platform")
new_metadata.pop("driver")
new_metadata.pop("platform")
self.assertEqual(metadata, new_metadata)

# wait for connection to become idle
time.sleep(0.005)
# add same metadata again
client.append_metadata(DriverInfo("Framework", None, None))
(
same_name,
same_version,
same_platform,
same_metadata,
) = self.send_ping_and_get_metadata(client, True)
self.assertEqual(new_name, same_name)
self.assertEqual(new_version, same_version)
self.assertEqual(new_platform, same_platform)


if __name__ == "__main__":
unittest.main()
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