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# Copyright 2015-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 the read_concern module."""
from __future__ import annotations
import sys
import unittest
sys.path[0:0] = [""]
from test.asynchronous import AsyncIntegrationTest, async_client_context
from test.utils_shared import OvertCommandListener
from bson.son import SON
from pymongo.errors import OperationFailure
from pymongo.read_concern import ReadConcern
_IS_SYNC = False
class TestReadConcern(AsyncIntegrationTest):
listener: OvertCommandListener
@async_client_context.require_connection
async def asyncSetUp(self):
await super().asyncSetUp()
self.listener = OvertCommandListener()
self.client = await self.async_rs_or_single_client(event_listeners=[self.listener])
self.db = self.client.pymongo_test
await async_client_context.client.pymongo_test.create_collection("coll")
async def asyncTearDown(self):
await async_client_context.client.pymongo_test.drop_collection("coll")
def test_read_concern(self):
rc = ReadConcern()
self.assertIsNone(rc.level)
self.assertTrue(rc.ok_for_legacy)
rc = ReadConcern("majority")
self.assertEqual("majority", rc.level)
self.assertFalse(rc.ok_for_legacy)
rc = ReadConcern("local")
self.assertEqual("local", rc.level)
self.assertTrue(rc.ok_for_legacy)
self.assertRaises(TypeError, ReadConcern, 42)
async def test_read_concern_uri(self):
uri = f"mongodb://{await async_client_context.pair}/?readConcernLevel=majority"
client = await self.async_rs_or_single_client(uri, connect=False)
self.assertEqual(ReadConcern("majority"), client.read_concern)
async def test_invalid_read_concern(self):
coll = self.db.get_collection("coll", read_concern=ReadConcern("unknown"))
# We rely on the server to validate read concern.
with self.assertRaises(OperationFailure):
await coll.find_one()
async def test_find_command(self):
# readConcern not sent in command if not specified.
coll = self.db.coll
await coll.find({"field": "value"}).to_list()
self.assertNotIn("readConcern", self.listener.started_events[0].command)
self.listener.reset()
# Explicitly set readConcern to 'local'.
coll = self.db.get_collection("coll", read_concern=ReadConcern("local"))
await coll.find({"field": "value"}).to_list()
self.assertEqualCommand(
SON(
[
("find", "coll"),
("filter", {"field": "value"}),
("readConcern", {"level": "local"}),
]
),
self.listener.started_events[0].command,
)
async def test_command_cursor(self):
# readConcern not sent in command if not specified.
coll = self.db.coll
await (await coll.aggregate([{"$match": {"field": "value"}}])).to_list()
self.assertNotIn("readConcern", self.listener.started_events[0].command)
self.listener.reset()
# Explicitly set readConcern to 'local'.
coll = self.db.get_collection("coll", read_concern=ReadConcern("local"))
await (await coll.aggregate([{"$match": {"field": "value"}}])).to_list()
self.assertEqual({"level": "local"}, self.listener.started_events[0].command["readConcern"])
async def test_aggregate_out(self):
coll = self.db.get_collection("coll", read_concern=ReadConcern("local"))
await (
await coll.aggregate([{"$match": {"field": "value"}}, {"$out": "output_collection"}])
).to_list()
# Aggregate with $out supports readConcern MongoDB 4.2 onwards.
if async_client_context.version >= (4, 1):
self.assertIn("readConcern", self.listener.started_events[0].command)
else:
self.assertNotIn("readConcern", self.listener.started_events[0].command)
if __name__ == "__main__":
unittest.main()
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