test_client.py

# Copyright 2013-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 mongo_client module."""

from __future__ import annotations

import _thread as thread
import asyncio
import base64
import contextlib
import copy
import datetime
import gc
import logging
import os
import re
import signal
import socket
import struct
import subprocess
import sys
import threading
import time
import uuid
from collections.abc import Iterable
from typing import Any, no_type_check
from unittest import mock, skipIf
from unittest.mock import patch

import pytest
import pytest_asyncio

from bson.binary import CSHARP_LEGACY, JAVA_LEGACY, PYTHON_LEGACY, Binary, UuidRepresentation
from pymongo.operations import _Op

sys.path[0:0] = [""]

import bson
import pymongo
from bson import encode
from bson.codec_options import (
    CodecOptions,
    DatetimeConversion,
    TypeEncoder,
    TypeRegistry,
)
from bson.son import SON
from bson.tz_util import utc
from pymongo import event_loggers, message, monitoring
from pymongo.asynchronous.command_cursor import AsyncCommandCursor
from pymongo.asynchronous.cursor import AsyncCursor, CursorType
from pymongo.asynchronous.database import AsyncDatabase
from pymongo.asynchronous.helpers import anext
from pymongo.asynchronous.mongo_client import AsyncMongoClient
from pymongo.asynchronous.pool import (
    AsyncConnection,
)
from pymongo.asynchronous.settings import TOPOLOGY_TYPE
from pymongo.asynchronous.topology import _ErrorContext
from pymongo.client_options import ClientOptions
from pymongo.common import _UUID_REPRESENTATIONS, CONNECT_TIMEOUT, MIN_SUPPORTED_WIRE_VERSION, has_c
from pymongo.compression_support import _have_snappy, _have_zstd
from pymongo.driver_info import DriverInfo
from pymongo.errors import (
    AutoReconnect,
    ConfigurationError,
    ConnectionFailure,
    InvalidName,
    InvalidOperation,
    InvalidURI,
    NetworkTimeout,
    OperationFailure,
    ServerSelectionTimeoutError,
    WaitQueueTimeoutError,
    WriteConcernError,
)
from pymongo.monitoring import ServerHeartbeatListener, ServerHeartbeatStartedEvent
from pymongo.pool_options import _MAX_METADATA_SIZE, _METADATA, ENV_VAR_K8S, PoolOptions
from pymongo.read_preferences import ReadPreference
from pymongo.server_description import ServerDescription
from pymongo.server_selectors import readable_server_selector, writable_server_selector
from pymongo.server_type import SERVER_TYPE
from pymongo.topology_description import TopologyDescription
from pymongo.write_concern import WriteConcern
from test.asynchronous import (
    HAVE_IPADDRESS,
    AsyncIntegrationTest,
    AsyncMockClientTest,
    AsyncUnitTest,
    SkipTest,
    async_client_context,
    client_knobs,
    connected,
    db_pwd,
    db_user,
    remove_all_users,
    unittest,
)
from test.asynchronous.pymongo_mocks import AsyncMockClient
from test.asynchronous.utils import (
    async_get_pool,
    async_wait_until,
    asyncAssertRaisesExactly,
)
from test.test_binary import BinaryData
from test.utils_shared import (
    NTHREADS,
    CMAPListener,
    FunctionCallRecorder,
    delay,
    gevent_monkey_patched,
    is_greenthread_patched,
    lazy_client_trial,
    one,
)

_IS_SYNC = False


class AsyncClientUnitTest(AsyncUnitTest):
    """AsyncMongoClient tests that don't require a server."""

    client: AsyncMongoClient

    async def asyncSetUp(self) -> None:
        self.client = await self.async_rs_or_single_client(
            connect=False, serverSelectionTimeoutMS=100
        )

    @pytest.fixture(autouse=True)
    def inject_fixtures(self, caplog):
        self._caplog = caplog

    async def test_keyword_arg_defaults(self):
        client = self.simple_client(
            socketTimeoutMS=None,
            connectTimeoutMS=20000,
            waitQueueTimeoutMS=None,
            replicaSet=None,
            read_preference=ReadPreference.PRIMARY,
            ssl=False,
            tlsCertificateKeyFile=None,
            tlsAllowInvalidCertificates=True,
            tlsCAFile=None,
            connect=False,
            serverSelectionTimeoutMS=12000,
        )

        options = client.options
        pool_opts = options.pool_options
        self.assertEqual(None, pool_opts.socket_timeout)
        # socket.Socket.settimeout takes a float in seconds
        self.assertEqual(20.0, pool_opts.connect_timeout)
        self.assertEqual(None, pool_opts.wait_queue_timeout)
        self.assertEqual(None, pool_opts._ssl_context)
        self.assertEqual(None, options.replica_set_name)
        self.assertEqual(ReadPreference.PRIMARY, client.read_preference)
        self.assertAlmostEqual(12, client.options.server_selection_timeout)

    async def test_connect_timeout(self):
        client = self.simple_client(connect=False, connectTimeoutMS=None, socketTimeoutMS=None)
        pool_opts = client.options.pool_options
        self.assertEqual(None, pool_opts.socket_timeout)
        self.assertEqual(None, pool_opts.connect_timeout)

        client = self.simple_client(connect=False, connectTimeoutMS=0, socketTimeoutMS=0)
        pool_opts = client.options.pool_options
        self.assertEqual(None, pool_opts.socket_timeout)
        self.assertEqual(None, pool_opts.connect_timeout)

        client = self.simple_client(
            "mongodb://localhost/?connectTimeoutMS=0&socketTimeoutMS=0", connect=False
        )
        pool_opts = client.options.pool_options
        self.assertEqual(None, pool_opts.socket_timeout)
        self.assertEqual(None, pool_opts.connect_timeout)

    def test_types(self):
        self.assertRaises(TypeError, AsyncMongoClient, 1)
        self.assertRaises(TypeError, AsyncMongoClient, 1.14)
        self.assertRaises(TypeError, AsyncMongoClient, "localhost", "27017")
        self.assertRaises(TypeError, AsyncMongoClient, "localhost", 1.14)
        self.assertRaises(TypeError, AsyncMongoClient, "localhost", [])

        self.assertRaises(ConfigurationError, AsyncMongoClient, [])

    async def test_repr_redacts_aws_session_token(self):
        token = "SECRET_AWS_SESSION_TOKEN"
        client = AsyncMongoClient(
            "mongodb://AKIA:SECRET@localhost:27017/"
            f"?authMechanism=MONGODB-AWS&authMechanismProperties=AWS_SESSION_TOKEN:{token}",
            connect=False,
        )

        the_repr = repr(client)

        self.assertNotIn(token, the_repr)
        self.assertIn("'AWS_SESSION_TOKEN': '<redacted>'", the_repr)

    async def test_repr_redacts_secret_auth_mechanism_properties(self):
        token = "SECRET_AWS_SESSION_TOKEN"
        api_key = "SECRET_API_KEY"
        client = AsyncMongoClient(
            "mongodb://AKIA:SECRET@localhost:27017/",
            authMechanism="MONGODB-AWS",
            authMechanismProperties={
                "aws_session_token": token,
                "CUSTOM_API_KEY": api_key,
                "TOKEN_RESOURCE": "mongodb://cluster.example",
            },
            connect=False,
        )

        the_repr = repr(client)

        self.assertNotIn(token, the_repr)
        self.assertNotIn(api_key, the_repr)
        self.assertIn("'aws_session_token': '<redacted>'", the_repr)
        self.assertIn("'CUSTOM_API_KEY': '<redacted>'", the_repr)
        self.assertIn("'TOKEN_RESOURCE': 'mongodb://cluster.example'", the_repr)

    async def test_max_pool_size_zero(self):
        self.simple_client(maxPoolSize=0)

    def test_uri_detection(self):
        self.assertRaises(ConfigurationError, AsyncMongoClient, "/foo")
        self.assertRaises(ConfigurationError, AsyncMongoClient, "://")
        self.assertRaises(ConfigurationError, AsyncMongoClient, "foo/")

    def test_get_db(self):
        def make_db(base, name):
            return base[name]

        self.assertRaises(InvalidName, make_db, self.client, "")
        self.assertRaises(InvalidName, make_db, self.client, "te$t")
        self.assertRaises(InvalidName, make_db, self.client, "te.t")
        self.assertRaises(InvalidName, make_db, self.client, "te\\t")
        self.assertRaises(InvalidName, make_db, self.client, "te/t")
        self.assertRaises(InvalidName, make_db, self.client, "te st")

        self.assertIsInstance(self.client.test, AsyncDatabase)
        self.assertEqual(self.client.test, self.client["test"])
        self.assertEqual(self.client.test, AsyncDatabase(self.client, "test"))

    def test_get_database(self):
        codec_options = CodecOptions(tz_aware=True)
        write_concern = WriteConcern(w=2, j=True)
        db = self.client.get_database("foo", codec_options, ReadPreference.SECONDARY, write_concern)
        self.assertEqual("foo", db.name)
        self.assertEqual(codec_options, db.codec_options)
        self.assertEqual(ReadPreference.SECONDARY, db.read_preference)
        self.assertEqual(write_concern, db.write_concern)

    def test_getattr(self):
        self.assertIsInstance(self.client["_does_not_exist"], AsyncDatabase)

        with self.assertRaises(AttributeError) as context:
            self.client._does_not_exist

        # Message should be:
        # "AttributeError: AsyncMongoClient has no attribute '_does_not_exist'. To
        # access the _does_not_exist database, use client['_does_not_exist']".
        self.assertIn("has no attribute '_does_not_exist'", str(context.exception))

    def test_iteration(self):
        client = self.client
        msg = "'AsyncMongoClient' object is not iterable"
        # Iteration fails
        with self.assertRaisesRegex(TypeError, msg):
            for _ in client:  # type: ignore[misc] # error: "None" not callable  [misc]
                break
        # Index fails
        with self.assertRaises(TypeError):
            _ = client[0]
        # next fails
        with self.assertRaisesRegex(TypeError, "'AsyncMongoClient' object is not iterable"):
            _ = next(client)
        # .next() fails
        with self.assertRaisesRegex(TypeError, "'AsyncMongoClient' object is not iterable"):
            _ = client.next()
        # Do not implement typing.Iterable.
        self.assertNotIsInstance(client, Iterable)

    async def test_get_default_database(self):
        c = await self.async_rs_or_single_client(
            "mongodb://%s:%d/foo"
            % (await async_client_context.host, await async_client_context.port),
            connect=False,
        )
        self.assertEqual(AsyncDatabase(c, "foo"), c.get_default_database())
        # Test that default doesn't override the URI value.
        self.assertEqual(AsyncDatabase(c, "foo"), c.get_default_database("bar"))

        codec_options = CodecOptions(tz_aware=True)
        write_concern = WriteConcern(w=2, j=True)
        db = c.get_default_database(None, codec_options, ReadPreference.SECONDARY, write_concern)
        self.assertEqual("foo", db.name)
        self.assertEqual(codec_options, db.codec_options)
        self.assertEqual(ReadPreference.SECONDARY, db.read_preference)
        self.assertEqual(write_concern, db.write_concern)

        c = await self.async_rs_or_single_client(
            "mongodb://%s:%d/" % (await async_client_context.host, await async_client_context.port),
            connect=False,
        )
        self.assertEqual(AsyncDatabase(c, "foo"), c.get_default_database("foo"))

    async def test_get_default_database_error(self):
        # URI with no database.
        c = await self.async_rs_or_single_client(
            "mongodb://%s:%d/" % (await async_client_context.host, await async_client_context.port),
            connect=False,
        )
        self.assertRaises(ConfigurationError, c.get_default_database)

    async def test_get_default_database_with_authsource(self):
        # Ensure we distinguish database name from authSource.
        uri = "mongodb://%s:%d/foo?authSource=src" % (
            await async_client_context.host,
            await async_client_context.port,
        )
        c = await self.async_rs_or_single_client(uri, connect=False)
        self.assertEqual(AsyncDatabase(c, "foo"), c.get_default_database())

    async def test_get_database_default(self):
        c = await self.async_rs_or_single_client(
            "mongodb://%s:%d/foo"
            % (await async_client_context.host, await async_client_context.port),
            connect=False,
        )
        self.assertEqual(AsyncDatabase(c, "foo"), c.get_database())

    async def test_get_database_default_error(self):
        # URI with no database.
        c = await self.async_rs_or_single_client(
            "mongodb://%s:%d/" % (await async_client_context.host, await async_client_context.port),
            connect=False,
        )
        self.assertRaises(ConfigurationError, c.get_database)

    async def test_get_database_default_with_authsource(self):
        # Ensure we distinguish database name from authSource.
        uri = "mongodb://%s:%d/foo?authSource=src" % (
            await async_client_context.host,
            await async_client_context.port,
        )
        c = await self.async_rs_or_single_client(uri, connect=False)
        self.assertEqual(AsyncDatabase(c, "foo"), c.get_database())

    async def test_primary_read_pref_with_tags(self):
        # No tags allowed with "primary".
        with self.assertRaises(ConfigurationError):
            await self.async_single_client("mongodb://host/?readpreferencetags=dc:east")

        with self.assertRaises(ConfigurationError):
            await self.async_single_client(
                "mongodb://host/?readpreference=primary&readpreferencetags=dc:east"
            )

    async def test_read_preference(self):
        c = await self.async_rs_or_single_client(
            "mongodb://host", connect=False, readpreference=ReadPreference.NEAREST.mongos_mode
        )
        self.assertEqual(c.read_preference, ReadPreference.NEAREST)

    async def test_metadata(self):
        metadata = copy.deepcopy(_METADATA)
        if has_c():
            metadata["driver"]["name"] = "PyMongo|c|async"
        else:
            metadata["driver"]["name"] = "PyMongo|async"
        metadata["application"] = {"name": "foobar"}
        client = self.simple_client("mongodb://foo:27017/?appname=foobar&connect=false")
        options = client.options
        self.assertEqual(options.pool_options.metadata, metadata)
        client = self.simple_client("foo", 27017, appname="foobar", connect=False)
        options = client.options
        self.assertEqual(options.pool_options.metadata, metadata)
        # No error
        self.simple_client(appname="x" * 128)
        with self.assertRaises(ValueError):
            self.simple_client(appname="x" * 129)
        # Bad "driver" options.
        self.assertRaises(TypeError, DriverInfo, "Foo", 1, "a")
        self.assertRaises(TypeError, DriverInfo, version="1", platform="a")
        self.assertRaises(TypeError, DriverInfo)
        with self.assertRaises(TypeError):
            self.simple_client(driver=1)
        with self.assertRaises(TypeError):
            self.simple_client(driver="abc")
        with self.assertRaises(TypeError):
            self.simple_client(driver=("Foo", "1", "a"))
        # Test appending to driver info.
        if has_c():
            metadata["driver"]["name"] = "PyMongo|c|async|FooDriver"
        else:
            metadata["driver"]["name"] = "PyMongo|async|FooDriver"
        metadata["driver"]["version"] = "{}|1.2.3".format(_METADATA["driver"]["version"])
        client = self.simple_client(
            "foo",
            27017,
            appname="foobar",
            driver=DriverInfo("FooDriver", "1.2.3", None),
            connect=False,
        )
        options = client.options
        self.assertEqual(options.pool_options.metadata, metadata)
        metadata["platform"] = "{}|FooPlatform".format(_METADATA["platform"])
        client = self.simple_client(
            "foo",
            27017,
            appname="foobar",
            driver=DriverInfo("FooDriver", "1.2.3", "FooPlatform"),
            connect=False,
        )
        options = client.options
        self.assertEqual(options.pool_options.metadata, metadata)
        # Test truncating driver info metadata.
        client = self.simple_client(
            driver=DriverInfo(name="s" * _MAX_METADATA_SIZE),
            connect=False,
        )
        options = client.options
        self.assertLessEqual(
            len(bson.encode(options.pool_options.metadata)),
            _MAX_METADATA_SIZE,
        )
        client = self.simple_client(
            driver=DriverInfo(name="s" * _MAX_METADATA_SIZE, version="s" * _MAX_METADATA_SIZE),
            connect=False,
        )
        options = client.options
        self.assertLessEqual(
            len(bson.encode(options.pool_options.metadata)),
            _MAX_METADATA_SIZE,
        )

    @mock.patch.dict("os.environ", {ENV_VAR_K8S: "1"})
    def test_container_metadata(self):
        metadata = copy.deepcopy(_METADATA)
        metadata["driver"]["name"] = "PyMongo|async"
        metadata["env"] = {}
        metadata["env"]["container"] = {"orchestrator": "kubernetes"}
        client = self.simple_client("mongodb://foo:27017/?appname=foobar&connect=false")
        options = client.options
        self.assertEqual(options.pool_options.metadata["env"], metadata["env"])

    async def test_kwargs_codec_options(self):
        class MyFloatType:
            def __init__(self, x):
                self.__x = x

            @property
            def x(self):
                return self.__x

        class MyFloatAsIntEncoder(TypeEncoder):
            python_type = MyFloatType

            def transform_python(self, value):
                return int(value)

        # Ensure codec options are passed in correctly
        document_class: type[SON] = SON
        type_registry = TypeRegistry([MyFloatAsIntEncoder()])
        tz_aware = True
        uuid_representation_label = "javaLegacy"
        unicode_decode_error_handler = "ignore"
        tzinfo = utc
        c = self.simple_client(
            document_class=document_class,
            type_registry=type_registry,
            tz_aware=tz_aware,
            uuidrepresentation=uuid_representation_label,
            unicode_decode_error_handler=unicode_decode_error_handler,
            tzinfo=tzinfo,
            connect=False,
        )
        self.assertEqual(c.codec_options.document_class, document_class)
        self.assertEqual(c.codec_options.type_registry, type_registry)
        self.assertEqual(c.codec_options.tz_aware, tz_aware)
        self.assertEqual(
            c.codec_options.uuid_representation,
            _UUID_REPRESENTATIONS[uuid_representation_label],
        )
        self.assertEqual(c.codec_options.unicode_decode_error_handler, unicode_decode_error_handler)
        self.assertEqual(c.codec_options.tzinfo, tzinfo)

    async def test_uri_codec_options(self):
        # Ensure codec options are passed in correctly
        uuid_representation_label = "javaLegacy"
        unicode_decode_error_handler = "ignore"
        datetime_conversion = "DATETIME_CLAMP"
        uri = (
            "mongodb://%s:%d/foo?tz_aware=true&uuidrepresentation="
            "%s&unicode_decode_error_handler=%s"
            "&datetime_conversion=%s"
            % (
                await async_client_context.host,
                await async_client_context.port,
                uuid_representation_label,
                unicode_decode_error_handler,
                datetime_conversion,
            )
        )
        c = self.simple_client(uri, connect=False)
        self.assertEqual(c.codec_options.tz_aware, True)
        self.assertEqual(
            c.codec_options.uuid_representation,
            _UUID_REPRESENTATIONS[uuid_representation_label],
        )
        self.assertEqual(c.codec_options.unicode_decode_error_handler, unicode_decode_error_handler)
        self.assertEqual(
            c.codec_options.datetime_conversion, DatetimeConversion[datetime_conversion]
        )

        # Change the passed datetime_conversion to a number and re-assert.
        uri = uri.replace(datetime_conversion, f"{int(DatetimeConversion[datetime_conversion])}")
        c = self.simple_client(uri, connect=False)
        self.assertEqual(
            c.codec_options.datetime_conversion, DatetimeConversion[datetime_conversion]
        )

    async def test_uri_option_precedence(self):
        # Ensure kwarg options override connection string options.
        uri = "mongodb://localhost/?ssl=true&replicaSet=name&readPreference=primary"
        c = self.simple_client(
            uri, ssl=False, replicaSet="newname", readPreference="secondaryPreferred"
        )
        clopts = c.options
        opts = clopts._options

        self.assertEqual(opts["tls"], False)
        self.assertEqual(clopts.replica_set_name, "newname")
        self.assertEqual(clopts.read_preference, ReadPreference.SECONDARY_PREFERRED)

    async def test_connection_timeout_ms_propagates_to_DNS_resolver(self):
        # Patch the resolver.
        from pymongo.asynchronous.srv_resolver import _resolve

        patched_resolver = FunctionCallRecorder(_resolve)
        pymongo.asynchronous.srv_resolver._resolve = patched_resolver

        def reset_resolver():
            pymongo.asynchronous.srv_resolver._resolve = _resolve

        self.addCleanup(reset_resolver)

        # Setup.
        base_uri = "mongodb+srv://test5.test.build.10gen.cc"
        connectTimeoutMS = 5000
        expected_kw_value = 5.0
        uri_with_timeout = base_uri + "/?connectTimeoutMS=6000"
        expected_uri_value = 6.0

        async def test_scenario(args, kwargs, expected_value):
            patched_resolver.reset()
            self.simple_client(*args, **kwargs)
            for _, kw in patched_resolver.call_list():
                self.assertAlmostEqual(kw["lifetime"], expected_value)

        # No timeout specified.
        await test_scenario((base_uri,), {}, CONNECT_TIMEOUT)

        # Timeout only specified in connection string.
        await test_scenario((uri_with_timeout,), {}, expected_uri_value)

        # Timeout only specified in keyword arguments.
        kwarg = {"connectTimeoutMS": connectTimeoutMS}
        await test_scenario((base_uri,), kwarg, expected_kw_value)

        # Timeout specified in both kwargs and connection string.
        await test_scenario((uri_with_timeout,), kwarg, expected_kw_value)

    async def test_uri_security_options(self):
        # Ensure that we don't silently override security-related options.
        with self.assertRaises(InvalidURI):
            self.simple_client("mongodb://localhost/?ssl=true", tls=False, connect=False)

        # Matching SSL and TLS options should not cause errors.
        c = self.simple_client("mongodb://localhost/?ssl=false", tls=False, connect=False)
        self.assertEqual(c.options._options["tls"], False)

        # Conflicting tlsInsecure options should raise an error.
        with self.assertRaises(InvalidURI):
            self.simple_client(
                "mongodb://localhost/?tlsInsecure=true",
                connect=False,
                tlsAllowInvalidHostnames=True,
            )

        # Conflicting legacy tlsInsecure options should also raise an error.
        with self.assertRaises(InvalidURI):
            self.simple_client(
                "mongodb://localhost/?tlsInsecure=true",
                connect=False,
                tlsAllowInvalidCertificates=False,
            )

        # Conflicting kwargs should raise InvalidURI
        with self.assertRaises(InvalidURI):
            self.simple_client(ssl=True, tls=False)

    async def test_event_listeners(self):
        c = self.simple_client(event_listeners=[], connect=False)
        self.assertEqual(c.options.event_listeners, [])
        listeners = [
            event_loggers.CommandLogger(),
            event_loggers.HeartbeatLogger(),
            event_loggers.ServerLogger(),
            event_loggers.TopologyLogger(),
            event_loggers.ConnectionPoolLogger(),
        ]
        c = self.simple_client(event_listeners=listeners, connect=False)
        self.assertEqual(c.options.event_listeners, listeners)

    async def test_client_options(self):
        c = self.simple_client(connect=False)
        self.assertIsInstance(c.options, ClientOptions)
        self.assertIsInstance(c.options.pool_options, PoolOptions)
        self.assertEqual(c.options.server_selection_timeout, 30)
        self.assertEqual(c.options.pool_options.max_idle_time_seconds, None)
        self.assertIsInstance(c.options.retry_writes, bool)
        self.assertIsInstance(c.options.retry_reads, bool)

    def test_validate_suggestion(self):
        """Validate kwargs in constructor."""
        for typo in ["auth", "Auth", "AUTH"]:
            expected = f"Unknown option: {typo}. Did you mean one of (authsource, authmechanism, authoidcallowedhosts) or maybe a camelCase version of one? Refer to docstring."
            expected = re.escape(expected)
            with self.assertRaisesRegex(ConfigurationError, expected):
                AsyncMongoClient(**{typo: "standard"})  # type: ignore[arg-type]

    @patch("pymongo.asynchronous.srv_resolver._SrvResolver.get_hosts")
    def test_detected_environment_logging(self, mock_get_hosts):
        normal_hosts = [
            "normal.host.com",
            "host.cosmos.azure.com",
            "host.docdb.amazonaws.com",
            "host.docdb-elastic.amazonaws.com",
        ]
        srv_hosts = ["mongodb+srv://<test>:<test>@" + s for s in normal_hosts]
        multi_host = (
            "host.cosmos.azure.com,host.docdb.amazonaws.com,host.docdb-elastic.amazonaws.com"
        )
        with self.assertLogs("pymongo", level="INFO") as cm:
            for host in normal_hosts:
                AsyncMongoClient(host, connect=False)
            for host in srv_hosts:
                mock_get_hosts.return_value = [(host, 1)]
                AsyncMongoClient(host, connect=False)
            AsyncMongoClient(multi_host, connect=False)
            logs = [record.getMessage() for record in cm.records if record.name == "pymongo.client"]
            self.assertEqual(len(logs), 7)

    @skipIf(os.environ.get("DEBUG_LOG"), "Enabling debug logs breaks this test")
    @patch("pymongo.asynchronous.srv_resolver._SrvResolver.get_hosts")
    async def test_detected_environment_warning(self, mock_get_hosts):
        with self._caplog.at_level(logging.WARN):
            normal_hosts = [
                "host.cosmos.azure.com",
                "host.docdb.amazonaws.com",
                "host.docdb-elastic.amazonaws.com",
            ]
            srv_hosts = ["mongodb+srv://<test>:<test>@" + s for s in normal_hosts]
            multi_host = (
                "host.cosmos.azure.com,host.docdb.amazonaws.com,host.docdb-elastic.amazonaws.com"
            )
            for host in normal_hosts:
                with self.assertWarns(UserWarning):
                    self.simple_client(host)
            for host in srv_hosts:
                mock_get_hosts.return_value = [(host, 1)]
                with self.assertWarns(UserWarning):
                    self.simple_client(host)
            with self.assertWarns(UserWarning):
                self.simple_client(multi_host)

    async def test_max_adaptive_retries(self):
        # Assert that max adaptive retries defaults to 2.
        c = self.simple_client(connect=False)
        self.assertEqual(c.options.max_adaptive_retries, 2)

        # Assert that max adaptive retries can be configured through connection or client options.
        c = self.simple_client(connect=False, max_adaptive_retries=10)
        self.assertEqual(c.options.max_adaptive_retries, 10)

        c = self.simple_client(connect=False, maxAdaptiveRetries=10)
        self.assertEqual(c.options.max_adaptive_retries, 10)

        c = self.simple_client(host="mongodb://localhost/?maxAdaptiveRetries=10", connect=False)
        self.assertEqual(c.options.max_adaptive_retries, 10)

    async def test_enable_overload_retargeting(self):
        # Assert that overload retargeting defaults to false.
        c = self.simple_client(connect=False)
        self.assertFalse(c.options.enable_overload_retargeting)

        # Assert that overload retargeting can be enabled through connection or client options.
        c = self.simple_client(connect=False, enable_overload_retargeting=True)
        self.assertTrue(c.options.enable_overload_retargeting)

        c = self.simple_client(connect=False, enableOverloadRetargeting=True)
        self.assertTrue(c.options.enable_overload_retargeting)

        c = self.simple_client(
            host="mongodb://localhost/?enableOverloadRetargeting=true", connect=False
        )
        self.assertTrue(c.options.enable_overload_retargeting)


class TestClient(AsyncIntegrationTest):
    def test_multiple_uris(self):
        with self.assertRaises(ConfigurationError):
            AsyncMongoClient(
                host=[
                    "mongodb+srv://cluster-a.abc12.mongodb.net",
                    "mongodb+srv://cluster-b.abc12.mongodb.net",
                    "mongodb+srv://cluster-c.abc12.mongodb.net",
                ]
            )

    async def test_max_idle_time_reaper_default(self):
        with client_knobs(kill_cursor_frequency=0.1):
            # Assert reaper doesn't remove connections when maxIdleTimeMS not set
            client = await self.async_rs_or_single_client()
            server = await (await client._get_topology()).select_server(
                readable_server_selector, _Op.TEST
            )
            async with server._pool.checkout() as conn:
                pass
            self.assertEqual(1, len(server._pool.conns))
            self.assertIn(conn, server._pool.conns)

    async def test_max_idle_time_reaper_removes_stale_minPoolSize(self):
        with client_knobs(kill_cursor_frequency=0.1):
            # Assert reaper removes idle socket and replaces it with a new one
            client = await self.async_rs_or_single_client(maxIdleTimeMS=500, minPoolSize=1)
            server = await (await client._get_topology()).select_server(
                readable_server_selector, _Op.TEST
            )
            async with server._pool.checkout() as conn:
                pass
            # When the reaper runs at the same time as the get_socket, two
            # connections could be created and checked into the pool.
            self.assertGreaterEqual(len(server._pool.conns), 1)
            await async_wait_until(lambda: conn not in server._pool.conns, "remove stale socket")
            await async_wait_until(lambda: len(server._pool.conns) >= 1, "replace stale socket")

    async def test_max_idle_time_reaper_does_not_exceed_maxPoolSize(self):
        with client_knobs(kill_cursor_frequency=0.1):
            # Assert reaper respects maxPoolSize when adding new connections.
            client = await self.async_rs_or_single_client(
                maxIdleTimeMS=500, minPoolSize=1, maxPoolSize=1
            )
            server = await (await client._get_topology()).select_server(
                readable_server_selector, _Op.TEST
            )
            async with server._pool.checkout() as conn:
                pass
            # When the reaper runs at the same time as the get_socket,
            # maxPoolSize=1 should prevent two connections from being created.
            self.assertEqual(1, len(server._pool.conns))
            await async_wait_until(lambda: conn not in server._pool.conns, "remove stale socket")
            await async_wait_until(lambda: len(server._pool.conns) == 1, "replace stale socket")

    async def test_max_idle_time_reaper_removes_stale(self):
        with client_knobs(kill_cursor_frequency=0.1):
            # Assert reaper has removed idle socket and NOT replaced it
            client = await self.async_rs_or_single_client(maxIdleTimeMS=500)
            server = await (await client._get_topology()).select_server(
                readable_server_selector, _Op.TEST
            )
            async with server._pool.checkout() as conn_one:
                pass
            # Assert that the pool does not close connections prematurely.
            await asyncio.sleep(0.300)
            async with server._pool.checkout() as conn_two:
                pass
            self.assertIs(conn_one, conn_two)
            await async_wait_until(
                lambda: len(server._pool.conns) == 0,
                "stale socket reaped and new one NOT added to the pool",
            )

    async def test_min_pool_size(self):
        with client_knobs(kill_cursor_frequency=0.1):
            client = await self.async_rs_or_single_client()
            server = await (await client._get_topology()).select_server(
                readable_server_selector, _Op.TEST
            )
            self.assertEqual(0, len(server._pool.conns))

            # Assert that pool started up at minPoolSize
            client = await self.async_rs_or_single_client(minPoolSize=10)
            server = await (await client._get_topology()).select_server(
                readable_server_selector, _Op.TEST
            )
            await async_wait_until(
                lambda: len(server._pool.conns) == 10,
                "pool initialized with 10 connections",
            )

            # Assert that if a socket is closed, a new one takes its place
            async with server._pool.checkout() as conn:
                await conn.close_conn(None)
            await async_wait_until(
                lambda: len(server._pool.conns) == 10,
                "a closed socket gets replaced from the pool",
            )
            self.assertNotIn(conn, server._pool.conns)

    async def test_max_idle_time_checkout(self):
        # Use high frequency to test _get_socket_no_auth.
        with client_knobs(kill_cursor_frequency=99999999):
            client = await self.async_rs_or_single_client(maxIdleTimeMS=500)
            server = await (await client._get_topology()).select_server(
                readable_server_selector, _Op.TEST
            )
            async with server._pool.checkout() as conn:
                pass
            self.assertEqual(1, len(server._pool.conns))
            await asyncio.sleep(1)  # Sleep so that the socket becomes stale.

            async with server._pool.checkout() as new_con:
                self.assertNotEqual(conn, new_con)
            self.assertEqual(1, len(server._pool.conns))
            self.assertNotIn(conn, server._pool.conns)
            self.assertIn(new_con, server._pool.conns)

            # Test that connections are reused if maxIdleTimeMS is not set.
            client = await self.async_rs_or_single_client()
            server = await (await client._get_topology()).select_server(
                readable_server_selector, _Op.TEST
            )
            async with server._pool.checkout() as conn:
                pass
            self.assertEqual(1, len(server._pool.conns))
            await asyncio.sleep(1)
            async with server._pool.checkout() as new_con:
                self.assertEqual(conn, new_con)
            self.assertEqual(1, len(server._pool.conns))

    async def test_constants(self):
        """This test uses AsyncMongoClient explicitly to make sure that host and
        port are not overloaded.
        """
        host, port = await async_client_context.host, await async_client_context.port
        kwargs: dict = async_client_context.default_client_options.copy()
        if async_client_context.auth_enabled:
            kwargs["username"] = db_user
            kwargs["password"] = db_pwd

        # Set bad defaults.
        AsyncMongoClient.HOST = "somedomainthatdoesntexist.org"
        AsyncMongoClient.PORT = 123456789
        with self.assertRaises(AutoReconnect):
            c = self.simple_client(serverSelectionTimeoutMS=10, **kwargs)
            await connected(c)

        c = self.simple_client(host, port, **kwargs)
        # Override the defaults. No error.
        await connected(c)

        # Set good defaults.
        AsyncMongoClient.HOST = host
        AsyncMongoClient.PORT = port

        # No error.
        c = self.simple_client(**kwargs)
        await connected(c)

    async def test_init_disconnected(self):
        host, port = await async_client_context.host, await async_client_context.port
        c = await self.async_rs_or_single_client(connect=False)
        # is_primary causes client to block until connected
        self.assertIsInstance(await c.is_primary, bool)
        c = await self.async_rs_or_single_client(connect=False)
        self.assertIsInstance(await c.is_mongos, bool)
        c = await self.async_rs_or_single_client(connect=False)
        self.assertIsInstance(c.options.pool_options.max_pool_size, int)
        self.assertIsInstance(c.nodes, frozenset)

        c = await self.async_rs_or_single_client(connect=False)
        self.assertEqual(c.codec_options, CodecOptions())
        c = await self.async_rs_or_single_client(connect=False)
        self.assertFalse(await c.primary)
        self.assertFalse(await c.secondaries)
        c = await self.async_rs_or_single_client(connect=False)
        self.assertIsInstance(c.topology_description, TopologyDescription)
        self.assertEqual(c.topology_description, c._topology._description)
        if async_client_context.is_rs:
            # The primary's host and port are from the replica set config.
            self.assertIsNotNone(await c.address)
        else:
            self.assertEqual(await c.address, (host, port))

        bad_host = "somedomainthatdoesntexist.org"
        c = self.simple_client(bad_host, port, connectTimeoutMS=1, serverSelectionTimeoutMS=10)
        with self.assertRaises(ConnectionFailure):
            await c.pymongo_test.test.find_one()

    async def test_init_disconnected_with_auth(self):
        uri = "mongodb://user:pass@somedomainthatdoesntexist"
        c = self.simple_client(uri, connectTimeoutMS=1, serverSelectionTimeoutMS=10)
        with self.assertRaises(ConnectionFailure):
            await c.pymongo_test.test.find_one()

    @async_client_context.require_replica_set
    @async_client_context.require_no_load_balancer
    @async_client_context.require_tls
    async def test_init_disconnected_with_srv(self):
        c = await self.async_rs_or_single_client(
            "mongodb+srv://test1.test.build.10gen.cc", connect=False, tlsInsecure=True
        )
        # nodes returns an empty set if not connected
        self.assertEqual(c.nodes, frozenset())
        # topology_description returns the initial seed description if not connected
        topology_description = c.topology_description
        self.assertEqual(topology_description.topology_type, TOPOLOGY_TYPE.Unknown)
        self.assertEqual(
            {
                ("test1.test.build.10gen.cc", None): ServerDescription(
                    ("test1.test.build.10gen.cc", None)
                )
            },
            topology_description.server_descriptions(),
        )

        # address causes client to block until connected
        self.assertIsNotNone(await c.address)
        # Initial seed topology and connected topology have the same ID
        self.assertEqual(
            c._topology._topology_id, topology_description._topology_settings._topology_id
        )
        await c.close()

        c = await self.async_rs_or_single_client(
            "mongodb+srv://test1.test.build.10gen.cc", connect=False, tlsInsecure=True
        )
        # primary causes client to block until connected
        await c.primary
        self.assertIsNotNone(c._topology)
        await c.close()

        c = await self.async_rs_or_single_client(
            "mongodb+srv://test1.test.build.10gen.cc", connect=False, tlsInsecure=True
        )
        # secondaries causes client to block until connected
        await c.secondaries
        self.assertIsNotNone(c._topology)
        await c.close()

        c = await self.async_rs_or_single_client(
            "mongodb+srv://test1.test.build.10gen.cc", connect=False, tlsInsecure=True
        )
        # arbiters causes client to block until connected
        await c.arbiters
        self.assertIsNotNone(c._topology)

    async def test_equality(self):
        seed = "{}:{}".format(*list(self.client._topology_settings.seeds)[0])
        c = await self.async_rs_or_single_client(seed, connect=False)
        self.assertEqual(async_client_context.client, c)
        # Explicitly test inequality
        self.assertFalse(async_client_context.client != c)

        c = await self.async_rs_or_single_client("invalid.com", connect=False)
        self.assertNotEqual(async_client_context.client, c)
        self.assertTrue(async_client_context.client != c)

        c1 = self.simple_client("a", connect=False)
        c2 = self.simple_client("b", connect=False)

        # Seeds differ:
        self.assertNotEqual(c1, c2)

        c1 = self.simple_client(["a", "b", "c"], connect=False)
        c2 = self.simple_client(["c", "a", "b"], connect=False)

        # Same seeds but out of order still compares equal:
        self.assertEqual(c1, c2)

    async def test_hashable(self):
        seed = "{}:{}".format(*list(self.client._topology_settings.seeds)[0])
        c = await self.async_rs_or_single_client(seed, connect=False)
        self.assertIn(c, {async_client_context.client})
        c = await self.async_rs_or_single_client("invalid.com", connect=False)
        self.assertNotIn(c, {async_client_context.client})

    async def test_host_w_port(self):
        with self.assertRaises(ValueError):
            host = await async_client_context.host
            await connected(
                AsyncMongoClient(
                    f"{host}:1234567",
                    connectTimeoutMS=1,
                    serverSelectionTimeoutMS=10,
                )
            )

    async def test_repr(self):
        # Used to test 'eval' below.
        import bson

        client = AsyncMongoClient(  # type: ignore[type-var]
            "mongodb://localhost:27017,localhost:27018/?replicaSet=replset"
            "&connectTimeoutMS=12345&w=1&wtimeoutms=100",
            connect=False,
            document_class=SON,
        )

        the_repr = repr(client)
        self.assertIn("AsyncMongoClient(host=", the_repr)
        self.assertIn("document_class=bson.son.SON, tz_aware=False, connect=False, ", the_repr)
        self.assertIn("connecttimeoutms=12345", the_repr)
        self.assertIn("replicaset='replset'", the_repr)
        self.assertIn("w=1", the_repr)
        self.assertIn("wtimeoutms=100", the_repr)

        async with eval(the_repr) as client_two:
            self.assertEqual(client_two, client)

        client = self.simple_client(
            "localhost:27017,localhost:27018",
            replicaSet="replset",
            connectTimeoutMS=12345,
            socketTimeoutMS=None,
            w=1,
            wtimeoutms=100,
            connect=False,
        )
        the_repr = repr(client)
        self.assertIn("AsyncMongoClient(host=", the_repr)
        self.assertIn("document_class=dict, tz_aware=False, connect=False, ", the_repr)
        self.assertIn("connecttimeoutms=12345", the_repr)
        self.assertIn("replicaset='replset'", the_repr)
        self.assertIn("sockettimeoutms=None", the_repr)
        self.assertIn("w=1", the_repr)
        self.assertIn("wtimeoutms=100", the_repr)

        async with eval(the_repr) as client_two:
            self.assertEqual(client_two, client)

    async def test_repr_srv_host(self):
        client = AsyncMongoClient("mongodb+srv://test1.test.build.10gen.cc/", connect=False)
        # before srv resolution
        self.assertIn("host='mongodb+srv://test1.test.build.10gen.cc'", repr(client))
        await client.aconnect()
        # after srv resolution
        self.assertIn("host=['localhost.test.build.10gen.cc:", repr(client))
        await client.close()

    async def test_getters(self):
        await async_wait_until(
            lambda: async_client_context.nodes == self.client.nodes, "find all nodes"
        )

    async def test_list_databases(self):
        cmd_docs = (await self.client.admin.command("listDatabases"))["databases"]
        cursor = await self.client.list_databases()
        self.assertIsInstance(cursor, AsyncCommandCursor)
        helper_docs = await cursor.to_list()
        self.assertGreater(len(helper_docs), 0)
        self.assertEqual(len(helper_docs), len(cmd_docs))
        # PYTHON-3529 Some fields may change between calls, just compare names.
        for helper_doc, cmd_doc in zip(helper_docs, cmd_docs):
            self.assertIs(type(helper_doc), dict)
            self.assertEqual(helper_doc.keys(), cmd_doc.keys())
        client = await self.async_rs_or_single_client(document_class=SON)
        async for doc in await client.list_databases():
            self.assertIs(type(doc), dict)

        await self.client.pymongo_test.test.insert_one({})
        cursor = await self.client.list_databases(filter={"name": "admin"})
        docs = await cursor.to_list()
        self.assertEqual(1, len(docs))
        self.assertEqual(docs[0]["name"], "admin")

        cursor = await self.client.list_databases(nameOnly=True)
        async for doc in cursor:
            self.assertEqual(["name"], list(doc))

    async def test_list_database_names(self):
        await self.client.pymongo_test.test.insert_one({"dummy": "object"})
        await self.client.pymongo_test_mike.test.insert_one({"dummy": "object"})
        cmd_docs = (await self.client.admin.command("listDatabases"))["databases"]
        cmd_names = [doc["name"] for doc in cmd_docs]

        db_names = await self.client.list_database_names()
        self.assertIn("pymongo_test", db_names)
        self.assertIn("pymongo_test_mike", db_names)
        self.assertCountEqual(db_names, cmd_names)

    async def test_drop_database(self):
        with self.assertRaises(TypeError):
            await self.client.drop_database(5)  # type: ignore[arg-type]
        with self.assertRaises(TypeError):
            await self.client.drop_database(None)  # type: ignore[arg-type]

        await self.client.pymongo_test.test.insert_one({"dummy": "object"})
        await self.client.pymongo_test2.test.insert_one({"dummy": "object"})
        dbs = await self.client.list_database_names()
        self.assertIn("pymongo_test", dbs)
        self.assertIn("pymongo_test2", dbs)
        await self.client.drop_database("pymongo_test")

        if async_client_context.is_rs:
            wc_client = await self.async_rs_or_single_client(w=len(async_client_context.nodes) + 1)
            with self.assertRaises(WriteConcernError):
                await wc_client.drop_database("pymongo_test2")

        await self.client.drop_database(self.client.pymongo_test2)
        dbs = await self.client.list_database_names()
        self.assertNotIn("pymongo_test", dbs)
        self.assertNotIn("pymongo_test2", dbs)

    async def test_close(self):
        test_client = await self.async_rs_or_single_client()
        coll = test_client.pymongo_test.bar
        await test_client.close()
        with self.assertRaises(InvalidOperation):
            await coll.count_documents({})

    async def test_close_kills_cursors(self):
        test_client = await self.async_rs_or_single_client()
        # Kill any cursors possibly queued up by previous tests.
        gc.collect()
        await test_client._process_periodic_tasks()

        # Add some test data.
        coll = test_client.pymongo_test.test_close_kills_cursors
        docs_inserted = 1000
        await coll.insert_many([{"i": i} for i in range(docs_inserted)])

        # Open a cursor and leave it open on the server.
        cursor = coll.find().batch_size(10)
        self.assertTrue(bool(await anext(cursor)))
        self.assertLess(cursor.retrieved, docs_inserted)

        # Open a command cursor and leave it open on the server.
        cursor = await coll.aggregate([], batchSize=10)
        self.assertTrue(bool(await anext(cursor)))
        del cursor
        # Required for PyPy and other Python implementations that
        # don't use reference counting garbage collection.
        gc.collect()

        # Close the client and ensure the topology is closed.
        self.assertTrue(test_client._topology._opened)
        await test_client.close()
        self.assertFalse(test_client._topology._opened)
        test_client = await self.async_rs_or_single_client()
        # The killCursors task should not need to re-open the topology.
        await test_client._process_periodic_tasks()
        self.assertTrue(test_client._topology._opened)

    async def test_close_stops_kill_cursors_thread(self):
        client = await self.async_rs_client()
        await client.test.test.find_one()
        self.assertFalse(client._kill_cursors_executor._stopped)

        # Closing the client should stop the thread.
        await client.close()
        self.assertTrue(client._kill_cursors_executor._stopped)

        # Reusing the closed client should raise an InvalidOperation error.
        with self.assertRaises(InvalidOperation):
            await client.admin.command("ping")
        # Thread is still stopped.
        self.assertTrue(client._kill_cursors_executor._stopped)

    async def test_uri_connect_option(self):
        # Ensure that topology is not opened if connect=False.
        client = await self.async_rs_client(connect=False)
        self.assertFalse(client._topology._opened)

        # Ensure kill cursors thread has not been started.
        if _IS_SYNC:
            kc_thread = client._kill_cursors_executor._thread
            self.assertFalse(kc_thread and kc_thread.is_alive())
        else:
            kc_task = client._kill_cursors_executor._task
            self.assertFalse(kc_task and not kc_task.done())
        # Using the client should open topology and start the thread.
        await client.admin.command("ping")
        self.assertTrue(client._topology._opened)
        if _IS_SYNC:
            kc_thread = client._kill_cursors_executor._thread
            self.assertTrue(kc_thread and kc_thread.is_alive())
        else:
            kc_task = client._kill_cursors_executor._task
            self.assertTrue(kc_task and not kc_task.done())

    async def test_close_does_not_open_servers(self):
        client = await self.async_rs_client(connect=False)
        topology = client._topology
        self.assertEqual(topology._servers, {})
        await client.close()
        self.assertEqual(topology._servers, {})

    async def test_close_closes_sockets(self):
        client = await self.async_rs_client()
        await client.test.test.find_one()
        topology = client._topology
        await client.close()
        for server in topology._servers.values():
            self.assertFalse(server._pool.conns)
            self.assertTrue(server._monitor._executor._stopped)
            self.assertTrue(server._monitor._rtt_monitor._executor._stopped)
            self.assertFalse(server._monitor._pool.conns)
            self.assertFalse(server._monitor._rtt_monitor._pool.conns)

    def test_bad_uri(self):
        with self.assertRaises(InvalidURI):
            AsyncMongoClient("http://localhost")

    @async_client_context.require_auth
    @async_client_context.require_no_fips
    async def test_auth_from_uri(self):
        host, port = await async_client_context.host, await async_client_context.port
        await async_client_context.create_user("admin", "admin", "pass")
        self.addAsyncCleanup(async_client_context.drop_user, "admin", "admin")
        self.addAsyncCleanup(remove_all_users, self.client.pymongo_test)

        await async_client_context.create_user(
            "pymongo_test", "user", "pass", roles=["userAdmin", "readWrite"]
        )

        with self.assertRaises(OperationFailure):
            await connected(
                await self.async_rs_or_single_client_noauth("mongodb://a:b@%s:%d" % (host, port))
            )

        # No error.
        await connected(
            await self.async_rs_or_single_client_noauth("mongodb://admin:pass@%s:%d" % (host, port))
        )

        # Wrong database.
        uri = "mongodb://admin:pass@%s:%d/pymongo_test" % (host, port)
        with self.assertRaises(OperationFailure):
            await connected(await self.async_rs_or_single_client_noauth(uri))

        # No error.
        await connected(
            await self.async_rs_or_single_client_noauth(
                "mongodb://user:pass@%s:%d/pymongo_test" % (host, port)
            )
        )

        # Auth with lazy connection.
        await (
            await self.async_rs_or_single_client_noauth(
                "mongodb://user:pass@%s:%d/pymongo_test" % (host, port), connect=False
            )
        ).pymongo_test.test.find_one()

        # Wrong password.
        bad_client = await self.async_rs_or_single_client_noauth(
            "mongodb://user:wrong@%s:%d/pymongo_test" % (host, port), connect=False
        )

        with self.assertRaises(OperationFailure):
            await bad_client.pymongo_test.test.find_one()

    @async_client_context.require_auth
    async def test_username_and_password(self):
        await async_client_context.create_user("admin", "ad min", "pa/ss")
        self.addAsyncCleanup(async_client_context.drop_user, "admin", "ad min")

        c = await self.async_rs_or_single_client_noauth(username="ad min", password="pa/ss")

        # Username and password aren't in strings that will likely be logged.
        self.assertNotIn("ad min", repr(c))
        self.assertNotIn("ad min", str(c))
        self.assertNotIn("pa/ss", repr(c))
        self.assertNotIn("pa/ss", str(c))

        # Auth succeeds.
        await c.server_info()

        with self.assertRaises(OperationFailure):
            await (
                await self.async_rs_or_single_client_noauth(username="ad min", password="foo")
            ).server_info()

    @async_client_context.require_auth
    @async_client_context.require_no_fips
    async def test_lazy_auth_raises_operation_failure(self):
        host = await async_client_context.host
        lazy_client = await self.async_rs_or_single_client_noauth(
            f"mongodb://user:wrong@{host}/pymongo_test", connect=False
        )

        await asyncAssertRaisesExactly(OperationFailure, lazy_client.test.collection.find_one)

    @async_client_context.require_no_tls
    async def test_unix_socket(self):
        if not hasattr(socket, "AF_UNIX"):
            raise SkipTest("UNIX-sockets are not supported on this system")

        mongodb_socket = "/tmp/mongodb-%d.sock" % (await async_client_context.port,)
        encoded_socket = "%2Ftmp%2F" + "mongodb-%d.sock" % (await async_client_context.port,)
        if not os.access(mongodb_socket, os.R_OK):
            raise SkipTest("Socket file is not accessible")

        uri = "mongodb://%s" % encoded_socket
        # Confirm we can do operations via the socket.
        client = await self.async_rs_or_single_client(uri)
        await client.pymongo_test.test.insert_one({"dummy": "object"})
        dbs = await client.list_database_names()
        self.assertIn("pymongo_test", dbs)

        self.assertIn(mongodb_socket, repr(client))

        # Confirm it fails with a missing socket.
        with self.assertRaises(ConnectionFailure):
            c = self.simple_client(
                "mongodb://%2Ftmp%2Fnon-existent.sock", serverSelectionTimeoutMS=100
            )
            await connected(c)

    async def test_document_class(self):
        c = self.client
        db = c.pymongo_test
        await db.test.insert_one({"x": 1})

        self.assertEqual(dict, c.codec_options.document_class)
        self.assertIsInstance(await db.test.find_one(), dict)
        self.assertNotIsInstance(await db.test.find_one(), SON)

        c = await self.async_rs_or_single_client(document_class=SON)

        db = c.pymongo_test

        self.assertEqual(SON, c.codec_options.document_class)
        self.assertIsInstance(await db.test.find_one(), SON)

    async def test_timeouts(self):
        client = await self.async_rs_or_single_client(
            connectTimeoutMS=10500,
            socketTimeoutMS=10500,
            maxIdleTimeMS=10500,
            serverSelectionTimeoutMS=10500,
        )
        self.assertEqual(10.5, (await async_get_pool(client)).opts.connect_timeout)
        self.assertEqual(10.5, (await async_get_pool(client)).opts.socket_timeout)
        self.assertEqual(10.5, (await async_get_pool(client)).opts.max_idle_time_seconds)
        self.assertEqual(10.5, client.options.pool_options.max_idle_time_seconds)
        self.assertEqual(10.5, client.options.server_selection_timeout)

    async def test_socket_timeout_ms_validation(self):
        c = await self.async_rs_or_single_client(socketTimeoutMS=10 * 1000)
        self.assertEqual(10, (await async_get_pool(c)).opts.socket_timeout)

        c = await connected(await self.async_rs_or_single_client(socketTimeoutMS=None))
        self.assertEqual(None, (await async_get_pool(c)).opts.socket_timeout)

        c = await connected(await self.async_rs_or_single_client(socketTimeoutMS=0))
        self.assertEqual(None, (await async_get_pool(c)).opts.socket_timeout)

        with self.assertRaises(ValueError):
            async with await self.async_rs_or_single_client(socketTimeoutMS=-1):
                pass

        with self.assertRaises(ValueError):
            async with await self.async_rs_or_single_client(socketTimeoutMS=1e10):
                pass

        with self.assertRaises(ValueError):
            async with await self.async_rs_or_single_client(socketTimeoutMS="foo"):
                pass

    async def test_socket_timeout(self):
        no_timeout = self.client
        timeout_sec = 1
        timeout = await self.async_rs_or_single_client(socketTimeoutMS=1000 * timeout_sec)

        await no_timeout.pymongo_test.drop_collection("test")
        await no_timeout.pymongo_test.test.insert_one({"x": 1})

        # A $where clause that takes a second longer than the timeout
        where_func = delay(timeout_sec + 1)

        async def get_x(db):
            doc = await anext(db.test.find().where(where_func))
            return doc["x"]

        self.assertEqual(1, await get_x(no_timeout.pymongo_test))
        with self.assertRaises(NetworkTimeout):
            await get_x(timeout.pymongo_test)

    async def test_server_selection_timeout(self):
        client = AsyncMongoClient(serverSelectionTimeoutMS=100, connect=False)
        self.assertAlmostEqual(0.1, client.options.server_selection_timeout)
        await client.close()

        client = AsyncMongoClient(serverSelectionTimeoutMS=0, connect=False)

        self.assertAlmostEqual(0, client.options.server_selection_timeout)

        self.assertRaises(
            ValueError, AsyncMongoClient, serverSelectionTimeoutMS="foo", connect=False
        )
        self.assertRaises(ValueError, AsyncMongoClient, serverSelectionTimeoutMS=-1, connect=False)
        self.assertRaises(
            ConfigurationError, AsyncMongoClient, serverSelectionTimeoutMS=None, connect=False
        )
        await client.close()

        client = AsyncMongoClient(
            "mongodb://localhost/?serverSelectionTimeoutMS=100", connect=False
        )
        self.assertAlmostEqual(0.1, client.options.server_selection_timeout)
        await client.close()

        client = AsyncMongoClient("mongodb://localhost/?serverSelectionTimeoutMS=0", connect=False)
        self.assertAlmostEqual(0, client.options.server_selection_timeout)
        await client.close()

        # Test invalid timeout in URI ignored and set to default.
        client = AsyncMongoClient("mongodb://localhost/?serverSelectionTimeoutMS=-1", connect=False)
        self.assertAlmostEqual(30, client.options.server_selection_timeout)
        await client.close()

        client = AsyncMongoClient("mongodb://localhost/?serverSelectionTimeoutMS=", connect=False)
        self.assertAlmostEqual(30, client.options.server_selection_timeout)

    async def test_waitQueueTimeoutMS(self):
        listener = CMAPListener()
        client = await self.async_rs_or_single_client(
            waitQueueTimeoutMS=10, maxPoolSize=1, event_listeners=[listener]
        )
        pool = await async_get_pool(client)
        self.assertEqual(pool.opts.wait_queue_timeout, 0.01)
        async with pool.checkout():
            with self.assertRaises(WaitQueueTimeoutError):
                await client.test.command("ping")
        self.assertFalse(listener.events_by_type(monitoring.PoolClearedEvent))

    async def test_socketKeepAlive(self):
        pool = await async_get_pool(self.client)
        async with pool.checkout() as conn:
            keepalive = conn.conn.sock.getsockopt(socket.SOL_SOCKET, socket.SO_KEEPALIVE)
            self.assertTrue(keepalive)

    @no_type_check
    async def test_tz_aware(self):
        self.assertRaises(ValueError, AsyncMongoClient, tz_aware="foo")

        aware = await self.async_rs_or_single_client(tz_aware=True)
        self.addAsyncCleanup(aware.close)
        naive = self.client
        await aware.pymongo_test.drop_collection("test")

        now = datetime.datetime.now(tz=datetime.timezone.utc)
        await aware.pymongo_test.test.insert_one({"x": now})

        self.assertEqual(None, (await naive.pymongo_test.test.find_one())["x"].tzinfo)
        self.assertEqual(utc, (await aware.pymongo_test.test.find_one())["x"].tzinfo)
        self.assertEqual(
            (await aware.pymongo_test.test.find_one())["x"].replace(tzinfo=None),
            (await naive.pymongo_test.test.find_one())["x"],
        )

    @async_client_context.require_ipv6
    async def test_ipv6(self):
        if async_client_context.tls:
            if not HAVE_IPADDRESS:
                raise SkipTest("Need the ipaddress module to test with SSL")

        if async_client_context.auth_enabled:
            auth_str = f"{db_user}:{db_pwd}@"
        else:
            auth_str = ""

        uri = "mongodb://%s[::1]:%d" % (auth_str, await async_client_context.port)
        if async_client_context.is_rs:
            uri += "/?replicaSet=" + (async_client_context.replica_set_name or "")

        client = await self.async_rs_or_single_client_noauth(uri)
        await client.pymongo_test.test.insert_one({"dummy": "object"})
        await client.pymongo_test_bernie.test.insert_one({"dummy": "object"})

        dbs = await client.list_database_names()
        self.assertIn("pymongo_test", dbs)
        self.assertIn("pymongo_test_bernie", dbs)

    async def test_contextlib(self):
        client = await self.async_rs_or_single_client()
        await client.pymongo_test.drop_collection("test")
        await client.pymongo_test.test.insert_one({"foo": "bar"})

        # The socket used for the previous commands has been returned to the
        # pool
        self.assertEqual(1, len((await async_get_pool(client)).conns))

        # contextlib async support was added in Python 3.10
        if _IS_SYNC or sys.version_info >= (3, 10):
            async with contextlib.aclosing(client):
                self.assertEqual("bar", (await client.pymongo_test.test.find_one())["foo"])
            with self.assertRaises(InvalidOperation):
                await client.pymongo_test.test.find_one()
            client = await self.async_rs_or_single_client()
            async with client as client:
                self.assertEqual("bar", (await client.pymongo_test.test.find_one())["foo"])
            with self.assertRaises(InvalidOperation):
                await client.pymongo_test.test.find_one()

    @async_client_context.require_sync
    def test_interrupt_signal(self):
        if is_greenthread_patched():
            raise SkipTest("Can't reliably test interrupts with green threads")

        # Test fix for PYTHON-294 -- make sure AsyncMongoClient closes its
        # socket if it gets an interrupt while waiting to recv() from it.
        db = self.client.pymongo_test

        # A $where clause which takes 1.5 sec to execute
        where = delay(1.5)

        # Need exactly 1 document so find() will execute its $where clause once
        db.drop_collection("foo")
        db.foo.insert_one({"_id": 1})

        old_signal_handler = None
        try:
            # Platform-specific hacks for raising a KeyboardInterrupt on the
            # main thread while find() is in-progress: On Windows, SIGALRM is
            # unavailable so we use a second thread. In our Evergreen setup on
            # Linux, the thread technique causes an error in the test at
            # conn.recv(): TypeError: 'int' object is not callable
            # We don't know what causes this, so we hack around it.

            if sys.platform == "win32":

                def interrupter():
                    # Raises KeyboardInterrupt in the main thread
                    time.sleep(0.25)
                    thread.interrupt_main()

                thread.start_new_thread(interrupter, ())
            else:
                # Convert SIGALRM to SIGINT -- it's hard to schedule a SIGINT
                # for one second in the future, but easy to schedule SIGALRM.
                def sigalarm(num, frame):
                    raise KeyboardInterrupt

                old_signal_handler = signal.signal(signal.SIGALRM, sigalarm)
                signal.alarm(1)

            raised = False
            try:
                # Will be interrupted by a KeyboardInterrupt.
                next(db.foo.find({"$where": where}))  # type: ignore[call-overload]
            except KeyboardInterrupt:
                raised = True

            # Can't use self.assertRaises() because it doesn't catch system
            # exceptions
            self.assertTrue(raised, "Didn't raise expected KeyboardInterrupt")

            # Raises AssertionError due to PYTHON-294 -- Mongo's response to
            # the previous find() is still waiting to be read on the socket,
            # so the request id's don't match.
            self.assertEqual({"_id": 1}, next(db.foo.find()))  # type: ignore[call-overload]
        finally:
            if old_signal_handler:
                signal.signal(signal.SIGALRM, old_signal_handler)

    async def test_operation_failure(self):
        # Ensure AsyncMongoClient doesn't close socket after it gets an error
        # response to getLastError. PYTHON-395. We need a new client here
        # to avoid race conditions caused by replica set failover or idle
        # socket reaping.
        client = await self.async_single_client()
        await client.pymongo_test.test.find_one()
        pool = await async_get_pool(client)
        socket_count = len(pool.conns)
        self.assertGreaterEqual(socket_count, 1)
        old_conn = next(iter(pool.conns))
        await client.pymongo_test.test.drop()
        await client.pymongo_test.test.insert_one({"_id": "foo"})
        with self.assertRaises(OperationFailure):
            await client.pymongo_test.test.insert_one({"_id": "foo"})

        self.assertEqual(socket_count, len(pool.conns))
        new_con = next(iter(pool.conns))
        self.assertEqual(old_conn, new_con)

    async def test_lazy_connect_w0(self):
        # Ensure that connect-on-demand works when the first operation is
        # an unacknowledged write. This exercises _writable_max_wire_version().

        # Use a separate collection to avoid races where we're still
        # completing an operation on a collection while the next test begins.
        await async_client_context.client.drop_database("test_lazy_connect_w0")
        self.addAsyncCleanup(async_client_context.client.drop_database, "test_lazy_connect_w0")

        client = await self.async_rs_or_single_client(connect=False, w=0)
        await client.test_lazy_connect_w0.test.insert_one({})

        async def predicate():
            return await client.test_lazy_connect_w0.test.count_documents({}) == 1

        await async_wait_until(predicate, "find one document")

        client = await self.async_rs_or_single_client(connect=False, w=0)
        await client.test_lazy_connect_w0.test.update_one({}, {"$set": {"x": 1}})

        async def predicate():
            return (await client.test_lazy_connect_w0.test.find_one()).get("x") == 1

        await async_wait_until(predicate, "update one document")

        client = await self.async_rs_or_single_client(connect=False, w=0)
        await client.test_lazy_connect_w0.test.delete_one({})

        async def predicate():
            return await client.test_lazy_connect_w0.test.count_documents({}) == 0

        await async_wait_until(predicate, "delete one document")

    @async_client_context.require_no_mongos
    async def test_exhaust_network_error(self):
        # When doing an exhaust query, the socket stays checked out on success
        # but must be checked in on error to avoid semaphore leaks.
        client = await self.async_rs_or_single_client(maxPoolSize=1, retryReads=False)
        collection = client.pymongo_test.test
        pool = await async_get_pool(client)
        pool._check_interval_seconds = None  # Never check.

        # Ensure a socket.
        await connected(client)

        # Cause a network error.
        conn = one(pool.conns)
        await conn.conn.close()
        cursor = collection.find(cursor_type=CursorType.EXHAUST)
        with self.assertRaises(ConnectionFailure):
            await anext(cursor)

        self.assertTrue(conn.closed)

        # The semaphore was decremented despite the error.
        self.assertEqual(0, pool.requests)

    @async_client_context.require_auth
    async def test_auth_network_error(self):
        # Make sure there's no semaphore leak if we get a network error
        # when authenticating a new socket with cached credentials.

        # Get a client with one socket so we detect if it's leaked.
        c = await connected(
            await self.async_rs_or_single_client(
                maxPoolSize=1, waitQueueTimeoutMS=1, retryReads=False
            )
        )

        # Cause a network error on the actual socket.
        pool = await async_get_pool(c)
        conn = one(pool.conns)
        await conn.conn.close()

        # AsyncConnection.authenticate logs, but gets a socket.error. Should be
        # reraised as AutoReconnect.
        with self.assertRaises(AutoReconnect):
            await c.test.collection.find_one()

        # No semaphore leak, the pool is allowed to make a new socket.
        await c.test.collection.find_one()

    @async_client_context.require_no_replica_set
    async def test_connect_to_standalone_using_replica_set_name(self):
        client = await self.async_single_client(replicaSet="anything", serverSelectionTimeoutMS=100)
        with self.assertRaises(AutoReconnect):
            await client.test.test.find_one()

    @async_client_context.require_replica_set
    async def test_stale_getmore(self):
        # A cursor is created, but its member goes down and is removed from
        # the topology before the getMore message is sent. Test that
        # AsyncMongoClient._run_operation_with_response handles the error.
        with self.assertRaises(AutoReconnect):
            client = await self.async_rs_client(connect=False, serverSelectionTimeoutMS=100)
            await client._run_operation(
                operation=message._GetMore(
                    "pymongo_test",
                    "collection",
                    101,
                    1234,
                    client.codec_options,
                    ReadPreference.PRIMARY,
                    None,
                    client,
                    None,
                    None,
                    False,
                    None,
                ),
                run_with_conn=AsyncCursor(client.pymongo_test.collection)._run_with_conn,
                address=("not-a-member", 27017),
            )

    async def test_heartbeat_frequency_ms(self):
        class HeartbeatStartedListener(ServerHeartbeatListener):
            def __init__(self):
                self.results = []

            def started(self, event):
                self.results.append(event)

            def succeeded(self, event):
                pass

            def failed(self, event):
                pass

        old_init = ServerHeartbeatStartedEvent.__init__
        heartbeat_times = []

        def init(self, *args):
            old_init(self, *args)
            heartbeat_times.append(time.time())

        try:
            ServerHeartbeatStartedEvent.__init__ = init  # type: ignore
            listener = HeartbeatStartedListener()
            uri = "mongodb://%s:%d/?heartbeatFrequencyMS=500" % (
                await async_client_context.host,
                await async_client_context.port,
            )
            await self.async_single_client(uri, event_listeners=[listener])
            await async_wait_until(
                lambda: len(listener.results) >= 2, "record two ServerHeartbeatStartedEvents"
            )

            # Default heartbeatFrequencyMS is 10 sec. Check the interval was
            # closer to 0.5 sec with heartbeatFrequencyMS configured.
            self.assertAlmostEqual(heartbeat_times[1] - heartbeat_times[0], 0.5, delta=2)

        finally:
            ServerHeartbeatStartedEvent.__init__ = old_init  # type: ignore

    def test_small_heartbeat_frequency_ms(self):
        uri = "mongodb://example/?heartbeatFrequencyMS=499"
        with self.assertRaises(ConfigurationError) as context:
            AsyncMongoClient(uri)

        self.assertIn("heartbeatFrequencyMS", str(context.exception))

    async def test_compression(self):
        def compression_settings(client):
            pool_options = client.options.pool_options
            return pool_options._compression_settings

        uri = "mongodb://localhost:27017/?compressors=zlib"
        client = self.simple_client(uri, connect=False)
        opts = compression_settings(client)
        self.assertEqual(opts.compressors, ["zlib"])
        uri = "mongodb://localhost:27017/?compressors=zlib&zlibCompressionLevel=4"
        client = self.simple_client(uri, connect=False)
        opts = compression_settings(client)
        self.assertEqual(opts.compressors, ["zlib"])
        self.assertEqual(opts.zlib_compression_level, 4)
        uri = "mongodb://localhost:27017/?compressors=zlib&zlibCompressionLevel=-1"
        client = self.simple_client(uri, connect=False)
        opts = compression_settings(client)
        self.assertEqual(opts.compressors, ["zlib"])
        self.assertEqual(opts.zlib_compression_level, -1)
        uri = "mongodb://localhost:27017"
        client = self.simple_client(uri, connect=False)
        opts = compression_settings(client)
        self.assertEqual(opts.compressors, [])
        self.assertEqual(opts.zlib_compression_level, -1)
        uri = "mongodb://localhost:27017/?compressors=foobar"
        client = self.simple_client(uri, connect=False)
        opts = compression_settings(client)
        self.assertEqual(opts.compressors, [])
        self.assertEqual(opts.zlib_compression_level, -1)
        uri = "mongodb://localhost:27017/?compressors=foobar,zlib"
        client = self.simple_client(uri, connect=False)
        opts = compression_settings(client)
        self.assertEqual(opts.compressors, ["zlib"])
        self.assertEqual(opts.zlib_compression_level, -1)

        # According to the connection string spec, unsupported values
        # just raise a warning and are ignored.
        uri = "mongodb://localhost:27017/?compressors=zlib&zlibCompressionLevel=10"
        client = self.simple_client(uri, connect=False)
        opts = compression_settings(client)
        self.assertEqual(opts.compressors, ["zlib"])
        self.assertEqual(opts.zlib_compression_level, -1)
        uri = "mongodb://localhost:27017/?compressors=zlib&zlibCompressionLevel=-2"
        client = self.simple_client(uri, connect=False)
        opts = compression_settings(client)
        self.assertEqual(opts.compressors, ["zlib"])
        self.assertEqual(opts.zlib_compression_level, -1)

        if not _have_snappy():
            uri = "mongodb://localhost:27017/?compressors=snappy"
            client = self.simple_client(uri, connect=False)
            opts = compression_settings(client)
            self.assertEqual(opts.compressors, [])
        else:
            uri = "mongodb://localhost:27017/?compressors=snappy"
            client = self.simple_client(uri, connect=False)
            opts = compression_settings(client)
            self.assertEqual(opts.compressors, ["snappy"])
            uri = "mongodb://localhost:27017/?compressors=snappy,zlib"
            client = self.simple_client(uri, connect=False)
            opts = compression_settings(client)
            self.assertEqual(opts.compressors, ["snappy", "zlib"])

        if not _have_zstd():
            uri = "mongodb://localhost:27017/?compressors=zstd"
            client = self.simple_client(uri, connect=False)
            opts = compression_settings(client)
            self.assertEqual(opts.compressors, [])
        else:
            uri = "mongodb://localhost:27017/?compressors=zstd"
            client = self.simple_client(uri, connect=False)
            opts = compression_settings(client)
            self.assertEqual(opts.compressors, ["zstd"])
            uri = "mongodb://localhost:27017/?compressors=zstd,zlib"
            client = self.simple_client(uri, connect=False)
            opts = compression_settings(client)
            self.assertEqual(opts.compressors, ["zstd", "zlib"])

        options = async_client_context.default_client_options
        if "compressors" in options and "zlib" in options["compressors"]:
            for level in range(-1, 10):
                client = await self.async_single_client(zlibcompressionlevel=level)
                # No error
                await client.pymongo_test.test.find_one()

    @async_client_context.require_sync
    async def test_reset_during_update_pool(self):
        client = await self.async_rs_or_single_client(minPoolSize=10)
        await client.admin.command("ping")
        pool = await async_get_pool(client)
        generation = pool.gen.get_overall()

        # Continuously reset the pool.
        class ResetPoolThread(threading.Thread):
            def __init__(self, pool):
                super().__init__()
                self.running = True
                self.pool = pool

            def stop(self):
                self.running = False

            async def _run(self):
                while self.running:
                    exc = AutoReconnect("mock pool error")
                    ctx = _ErrorContext(exc, 0, pool.gen.get_overall(), False, None)
                    await client._topology.handle_error(pool.address, ctx)
                    await asyncio.sleep(0.001)

            def run(self):
                self._run()

        t = ResetPoolThread(pool)
        t.start()

        # Ensure that update_pool completes without error even when the pool
        # is reset concurrently.
        try:
            while True:
                for _ in range(10):
                    await client._topology.update_pool()
                if generation != pool.gen.get_overall():
                    break
        finally:
            t.stop()
            t.join()
        await client.admin.command("ping")

    async def test_background_connections_do_not_hold_locks(self):
        min_pool_size = 10
        client = await self.async_rs_or_single_client(
            serverSelectionTimeoutMS=3000, minPoolSize=min_pool_size, connect=False
        )
        # Create a single connection in the pool.
        await client.admin.command("ping")

        # Cause new connections stall for a few seconds.
        pool = await async_get_pool(client)
        original_connect = pool.connect

        async def stall_connect(*args, **kwargs):
            await asyncio.sleep(2)
            return await original_connect(*args, **kwargs)

        pool.connect = stall_connect
        # Un-patch Pool.connect to break the cyclic reference.
        self.addCleanup(delattr, pool, "connect")

        # Wait for the background thread to start creating connections
        await async_wait_until(lambda: len(pool.conns) > 1, "start creating connections")

        # Assert that application operations do not block.
        for _ in range(10):
            start = time.monotonic()
            await client.admin.command("ping")
            total = time.monotonic() - start
            # Each ping command should not take more than 2 seconds
            self.assertLess(total, 2)

    async def test_background_connections_log_on_error(self):
        with self.assertLogs("pymongo.client", level="ERROR") as cm:
            client = await self.async_rs_or_single_client(minPoolSize=1)
            # Create a single connection in the pool.
            await client.admin.command("ping")

            # Cause new connections to fail.
            pool = await async_get_pool(client)

            async def fail_connect(*args, **kwargs):
                raise Exception("failed to connect")

            pool.connect = fail_connect
            # Un-patch Pool.connect to break the cyclic reference.
            self.addCleanup(delattr, pool, "connect")

            await pool.reset_without_pause()

            await async_wait_until(
                lambda: "failed to connect" in "".join(cm.output), "start creating connections"
            )
            self.assertIn("MongoClient background task encountered an error", "".join(cm.output))

    @async_client_context.require_replica_set
    async def test_direct_connection(self):
        # direct_connection=True should result in Single topology.
        client = await self.async_rs_or_single_client(directConnection=True)
        await client.admin.command("ping")
        self.assertEqual(len(client.nodes), 1)
        self.assertEqual(client._topology_settings.get_topology_type(), TOPOLOGY_TYPE.Single)

        # direct_connection=False should result in RS topology.
        client = await self.async_rs_or_single_client(directConnection=False)
        await client.admin.command("ping")
        self.assertGreaterEqual(len(client.nodes), 1)
        self.assertIn(
            client._topology_settings.get_topology_type(),
            [TOPOLOGY_TYPE.ReplicaSetNoPrimary, TOPOLOGY_TYPE.ReplicaSetWithPrimary],
        )

        # directConnection=True, should error with multiple hosts as a list.
        with self.assertRaises(ConfigurationError):
            AsyncMongoClient(["host1", "host2"], directConnection=True)

    @unittest.skipIf("PyPy" in sys.version, "PYTHON-2927 fails often on PyPy")
    async def test_continuous_network_errors(self):
        def server_description_count():
            i = 0
            for obj in gc.get_objects():
                try:
                    if isinstance(obj, ServerDescription):
                        i += 1
                except ReferenceError:
                    pass
            return i

        gc.collect()
        with client_knobs(min_heartbeat_interval=0.002):
            client = self.simple_client(
                "invalid:27017", heartbeatFrequencyMS=2, serverSelectionTimeoutMS=200
            )
            initial_count = server_description_count()
            with self.assertRaises(ServerSelectionTimeoutError):
                await client.test.test.find_one()
            gc.collect()
            final_count = server_description_count()
            await client.close()
            # If a bug like PYTHON-2433 is reintroduced then too many
            # ServerDescriptions will be kept alive and this test will fail:
            # AssertionError: 11 != 47 within 20 delta (36 difference)
            self.assertAlmostEqual(initial_count, final_count, delta=30)

    @async_client_context.require_failCommand_fail_point
    async def test_network_error_message(self):
        client = await self.async_single_client(retryReads=False)
        await client.admin.command("ping")  # connect
        async with self.fail_point(
            {"mode": {"times": 1}, "data": {"closeConnection": True, "failCommands": ["find"]}}
        ):
            assert await client.address is not None
            expected = "{}:{}: ".format(*(await client.address))
            with self.assertRaisesRegex(AutoReconnect, expected):
                await client.pymongo_test.test.find_one({})

    @unittest.skipIf("PyPy" in sys.version, "PYTHON-2938 could fail on PyPy")
    async def test_process_periodic_tasks(self):
        client = await self.async_rs_or_single_client()
        coll = client.db.collection
        await coll.insert_many([{} for _ in range(5)])
        cursor = coll.find(batch_size=2)
        await cursor.next()
        c_id = cursor.cursor_id
        self.assertIsNotNone(c_id)
        await client.close()
        # Add cursor to kill cursors queue
        del cursor
        await async_wait_until(
            lambda: client._kill_cursors_queue,
            "waited for cursor to be added to queue",
        )
        await client._process_periodic_tasks()  # This must not raise or print any exceptions
        with self.assertRaises(InvalidOperation):
            await coll.insert_many([{} for _ in range(5)])

    async def test_service_name_from_kwargs(self):
        client = AsyncMongoClient(
            "mongodb+srv://user:password@test22.test.build.10gen.cc",
            srvServiceName="customname",
            connect=False,
        )
        await client.aconnect()
        self.assertEqual(client._topology_settings.srv_service_name, "customname")
        await client.close()
        client = AsyncMongoClient(
            "mongodb+srv://user:password@test22.test.build.10gen.cc"
            "/?srvServiceName=shouldbeoverriden",
            srvServiceName="customname",
            connect=False,
        )
        await client.aconnect()
        self.assertEqual(client._topology_settings.srv_service_name, "customname")
        await client.close()
        client = AsyncMongoClient(
            "mongodb+srv://user:password@test22.test.build.10gen.cc/?srvServiceName=customname",
            connect=False,
        )
        await client.aconnect()
        self.assertEqual(client._topology_settings.srv_service_name, "customname")
        await client.close()

    async def test_srv_max_hosts_kwarg(self):
        client = self.simple_client("mongodb+srv://test1.test.build.10gen.cc/")
        await client.aconnect()
        self.assertGreater(len(client.topology_description.server_descriptions()), 1)
        client = self.simple_client("mongodb+srv://test1.test.build.10gen.cc/", srvmaxhosts=1)
        await client.aconnect()
        self.assertEqual(len(client.topology_description.server_descriptions()), 1)
        client = self.simple_client(
            "mongodb+srv://test1.test.build.10gen.cc/?srvMaxHosts=1", srvmaxhosts=2
        )
        await client.aconnect()
        self.assertEqual(len(client.topology_description.server_descriptions()), 2)

    @unittest.skipIf(
        async_client_context.load_balancer,
        "loadBalanced clients do not run SDAM",
    )
    @unittest.skipIf(sys.platform == "win32", "Windows does not support SIGSTOP")
    @async_client_context.require_sync
    def test_sigstop_sigcont(self):
        test_dir = os.path.dirname(os.path.realpath(__file__))
        script = os.path.join(test_dir, "sigstop_sigcont.py")
        p = subprocess.Popen(
            [sys.executable, script, async_client_context.uri],
            stdin=subprocess.PIPE,
            stdout=subprocess.PIPE,
            stderr=subprocess.STDOUT,
        )
        self.addCleanup(p.wait, timeout=1)
        self.addCleanup(p.kill)
        time.sleep(1)
        # Stop the child, sleep for twice the streaming timeout
        # (heartbeatFrequencyMS + connectTimeoutMS), and restart.
        os.kill(p.pid, signal.SIGSTOP)
        time.sleep(2)
        os.kill(p.pid, signal.SIGCONT)
        time.sleep(0.5)
        # Tell the script to exit gracefully.
        outs, _ = p.communicate(input=b"q\n", timeout=10)
        self.assertTrue(outs)
        log_output = outs.decode("utf-8")
        self.assertIn("TEST STARTED", log_output)
        self.assertIn("ServerHeartbeatStartedEvent", log_output)
        self.assertIn("ServerHeartbeatSucceededEvent", log_output)
        self.assertIn("TEST COMPLETED", log_output)
        self.assertNotIn("ServerHeartbeatFailedEvent", log_output)

    async def _test_handshake(self, env_vars, expected_env):
        with patch.dict("os.environ", env_vars):
            metadata = copy.deepcopy(_METADATA)
            if has_c():
                metadata["driver"]["name"] = "PyMongo|c|async"
            else:
                metadata["driver"]["name"] = "PyMongo|async"
            if expected_env is not None:
                metadata["env"] = expected_env

                if "AWS_REGION" not in env_vars:
                    os.environ["AWS_REGION"] = ""
            client = await self.async_rs_or_single_client(serverSelectionTimeoutMS=10000)
            await client.admin.command("ping")
            options = client.options
            self.assertEqual(options.pool_options.metadata, metadata)

    async def test_handshake_01_aws(self):
        await self._test_handshake(
            {
                "AWS_EXECUTION_ENV": "AWS_Lambda_python3.10",
                "AWS_REGION": "us-east-2",
                "AWS_LAMBDA_FUNCTION_MEMORY_SIZE": "1024",
            },
            {"name": "aws.lambda", "region": "us-east-2", "memory_mb": 1024},
        )

    async def test_handshake_02_azure(self):
        await self._test_handshake({"FUNCTIONS_WORKER_RUNTIME": "python"}, {"name": "azure.func"})

    async def test_handshake_03_gcp(self):
        await self._test_handshake(
            {
                "K_SERVICE": "servicename",
                "FUNCTION_MEMORY_MB": "1024",
                "FUNCTION_TIMEOUT_SEC": "60",
                "FUNCTION_REGION": "us-central1",
            },
            {"name": "gcp.func", "region": "us-central1", "memory_mb": 1024, "timeout_sec": 60},
        )
        # Extra case for FUNCTION_NAME.
        await self._test_handshake(
            {
                "FUNCTION_NAME": "funcname",
                "FUNCTION_MEMORY_MB": "1024",
                "FUNCTION_TIMEOUT_SEC": "60",
                "FUNCTION_REGION": "us-central1",
            },
            {"name": "gcp.func", "region": "us-central1", "memory_mb": 1024, "timeout_sec": 60},
        )

    async def test_handshake_04_vercel(self):
        await self._test_handshake(
            {"VERCEL": "1", "VERCEL_REGION": "cdg1"}, {"name": "vercel", "region": "cdg1"}
        )

    async def test_handshake_05_multiple(self):
        await self._test_handshake(
            {"AWS_EXECUTION_ENV": "AWS_Lambda_python3.10", "FUNCTIONS_WORKER_RUNTIME": "python"},
            None,
        )
        # Extra cases for other combos.
        await self._test_handshake(
            {"FUNCTIONS_WORKER_RUNTIME": "python", "K_SERVICE": "servicename"},
            None,
        )
        await self._test_handshake({"K_SERVICE": "servicename", "VERCEL": "1"}, None)

    async def test_handshake_06_region_too_long(self):
        await self._test_handshake(
            {"AWS_EXECUTION_ENV": "AWS_Lambda_python3.10", "AWS_REGION": "a" * 512},
            {"name": "aws.lambda"},
        )

    async def test_handshake_07_memory_invalid_int(self):
        await self._test_handshake(
            {
                "AWS_EXECUTION_ENV": "AWS_Lambda_python3.10",
                "AWS_LAMBDA_FUNCTION_MEMORY_SIZE": "big",
            },
            {"name": "aws.lambda"},
        )

    async def test_handshake_08_invalid_aws_ec2(self):
        # AWS_EXECUTION_ENV needs to start with "AWS_Lambda_".
        await self._test_handshake(
            {"AWS_EXECUTION_ENV": "EC2"},
            None,
        )

    async def test_handshake_09_container_with_provider(self):
        await self._test_handshake(
            {
                ENV_VAR_K8S: "1",
                "AWS_LAMBDA_RUNTIME_API": "1",
                "AWS_REGION": "us-east-1",
                "AWS_LAMBDA_FUNCTION_MEMORY_SIZE": "256",
            },
            {
                "container": {"orchestrator": "kubernetes"},
                "name": "aws.lambda",
                "region": "us-east-1",
                "memory_mb": 256,
            },
        )

    async def test_handshake_10_agent_known(self):
        # A known coding-agent env var maps to its metadata value.
        await self._test_handshake({"CLAUDECODE": "1"}, {"agent": "CLAUDECODE"})
        await self._test_handshake({"CURSOR_AGENT": "1"}, {"agent": "CURSOR"})
        await self._test_handshake({"OPENCODE_CLIENT": "1"}, {"agent": "OPENCODE"})

    async def test_handshake_11_agent_generic(self):
        # Generic AI_AGENT/AGENT vars are used verbatim and take precedence.
        await self._test_handshake({"AI_AGENT": "myagent"}, {"agent": "myagent"})
        await self._test_handshake({"AGENT": "myagent"}, {"agent": "myagent"})
        await self._test_handshake({"AI_AGENT": "myagent", "CLAUDECODE": "1"}, {"agent": "myagent"})

    async def test_handshake_12_agent_with_provider(self):
        # agent is reported alongside a FaaS provider.
        await self._test_handshake(
            {"FUNCTIONS_WORKER_RUNTIME": "python", "CLAUDECODE": "1"},
            {"name": "azure.func", "agent": "CLAUDECODE"},
        )

    async def test_handshake_13_agent_too_long(self):
        # A too-long agent value is dropped during truncation before env.name.
        await self._test_handshake(
            {"FUNCTIONS_WORKER_RUNTIME": "python", "AI_AGENT": "a" * 512},
            {"name": "azure.func"},
        )

    def test_dict_hints(self):
        self.db.t.find(hint={"x": 1})

    def test_dict_hints_sort(self):
        result = self.db.t.find()
        result.sort({"x": 1})

        self.db.t.find(sort={"x": 1})

    async def test_dict_hints_create_index(self):
        await self.db.t.create_index({"x": pymongo.ASCENDING})

    async def test_legacy_java_uuid_roundtrip(self):
        data = BinaryData.java_data
        docs = bson.decode_all(data, CodecOptions(SON[str, Any], False, JAVA_LEGACY))

        await async_client_context.client.pymongo_test.drop_collection("java_uuid")
        db = async_client_context.client.pymongo_test
        coll = db.get_collection("java_uuid", CodecOptions(uuid_representation=JAVA_LEGACY))

        await coll.insert_many(docs)
        self.assertEqual(5, await coll.count_documents({}))
        async for d in coll.find():
            self.assertEqual(d["newguid"], uuid.UUID(d["newguidstring"]))

        coll = db.get_collection("java_uuid", CodecOptions(uuid_representation=PYTHON_LEGACY))
        async for d in coll.find():
            self.assertNotEqual(d["newguid"], d["newguidstring"])
        await async_client_context.client.pymongo_test.drop_collection("java_uuid")

    async def test_legacy_csharp_uuid_roundtrip(self):
        data = BinaryData.csharp_data
        docs = bson.decode_all(data, CodecOptions(SON[str, Any], False, CSHARP_LEGACY))

        await async_client_context.client.pymongo_test.drop_collection("csharp_uuid")
        db = async_client_context.client.pymongo_test
        coll = db.get_collection("csharp_uuid", CodecOptions(uuid_representation=CSHARP_LEGACY))

        await coll.insert_many(docs)
        self.assertEqual(5, await coll.count_documents({}))
        async for d in coll.find():
            self.assertEqual(d["newguid"], uuid.UUID(d["newguidstring"]))

        coll = db.get_collection("csharp_uuid", CodecOptions(uuid_representation=PYTHON_LEGACY))
        async for d in coll.find():
            self.assertNotEqual(d["newguid"], d["newguidstring"])
        await async_client_context.client.pymongo_test.drop_collection("csharp_uuid")

    async def test_uri_to_uuid(self):
        uri = "mongodb://foo/?uuidrepresentation=csharpLegacy"
        client = await self.async_single_client(uri, connect=False)
        self.assertEqual(client.pymongo_test.test.codec_options.uuid_representation, CSHARP_LEGACY)

    async def test_uuid_queries(self):
        db = async_client_context.client.pymongo_test
        coll = db.test
        await coll.drop()

        uu = uuid.uuid4()
        await coll.insert_one({"uuid": Binary(uu.bytes, 3)})
        self.assertEqual(1, await coll.count_documents({}))

        # Test regular UUID queries (using subtype 4).
        coll = db.get_collection(
            "test", CodecOptions(uuid_representation=UuidRepresentation.STANDARD)
        )
        self.assertEqual(0, await coll.count_documents({"uuid": uu}))
        await coll.insert_one({"uuid": uu})
        self.assertEqual(2, await coll.count_documents({}))
        docs = await coll.find({"uuid": uu}).to_list()
        self.assertEqual(1, len(docs))
        self.assertEqual(uu, docs[0]["uuid"])

        # Test both.
        uu_legacy = Binary.from_uuid(uu, UuidRepresentation.PYTHON_LEGACY)
        predicate = {"uuid": {"$in": [uu, uu_legacy]}}
        self.assertEqual(2, await coll.count_documents(predicate))
        docs = await coll.find(predicate).to_list()
        self.assertEqual(2, len(docs))
        await coll.drop()


class TestExhaustCursor(AsyncIntegrationTest):
    """Test that clients properly handle errors from exhaust cursors."""

    def setUp(self):
        super().setUp()
        if async_client_context.is_mongos:
            raise SkipTest("mongos doesn't support exhaust, SERVER-2627")

    async def test_exhaust_query_server_error(self):
        # When doing an exhaust query, the socket stays checked out on success
        # but must be checked in on error to avoid semaphore leaks.
        client = await connected(await self.async_rs_or_single_client(maxPoolSize=1))

        collection = client.pymongo_test.test
        pool = await async_get_pool(client)
        conn = one(pool.conns)

        # This will cause OperationFailure in all mongo versions since
        # the value for $orderby must be a document.
        cursor = collection.find(
            SON([("$query", {}), ("$orderby", True)]), cursor_type=CursorType.EXHAUST
        )

        with self.assertRaises(OperationFailure):
            await cursor.next()
        self.assertFalse(conn.closed)

        # The socket was checked in and the semaphore was decremented.
        self.assertIn(conn, pool.conns)
        self.assertEqual(0, pool.requests)

    async def test_exhaust_getmore_server_error(self):
        # When doing a getmore on an exhaust cursor, the socket stays checked
        # out on success but it's checked in on error to avoid semaphore leaks.
        client = await self.async_rs_or_single_client(maxPoolSize=1)
        collection = client.pymongo_test.test
        await collection.drop()

        await collection.insert_many([{} for _ in range(200)])
        self.addAsyncCleanup(async_client_context.client.pymongo_test.test.drop)

        pool = await async_get_pool(client)
        pool._check_interval_seconds = None  # Never check.
        conn = one(pool.conns)

        cursor = collection.find(cursor_type=CursorType.EXHAUST)

        # Initial query succeeds.
        await cursor.next()

        # Cause a server error on getmore.
        async def receive_message(request_id):
            # Discard the actual server response.
            await AsyncConnection.receive_message(conn, request_id)

            # Construct a valid OP_MSG error response.
            doc = encode({"ok": 0, "errmsg": "mock err", "code": 0})
            msg = struct.pack("<IB", 0, 0) + doc
            return message._OpMsg.unpack(msg)

        conn.receive_message = receive_message
        with self.assertRaises(OperationFailure):
            await cursor.to_list()
        # Unpatch the instance.
        del conn.receive_message

        # The socket is returned to the pool and it still works.
        self.assertEqual(200, await collection.count_documents({}))
        self.assertIn(conn, pool.conns)

    async def test_exhaust_query_network_error(self):
        # When doing an exhaust query, the socket stays checked out on success
        # but must be checked in on error to avoid semaphore leaks.
        client = await connected(
            await self.async_rs_or_single_client(maxPoolSize=1, retryReads=False)
        )
        collection = client.pymongo_test.test
        pool = await async_get_pool(client)
        pool._check_interval_seconds = None  # Never check.

        # Cause a network error.
        conn = one(pool.conns)
        await conn.conn.close()

        cursor = collection.find(cursor_type=CursorType.EXHAUST)
        with self.assertRaises(ConnectionFailure):
            await cursor.next()
        self.assertTrue(conn.closed)

        # The socket was closed and the semaphore was decremented.
        self.assertNotIn(conn, pool.conns)
        self.assertEqual(0, pool.requests)

    async def test_exhaust_getmore_network_error(self):
        # When doing a getmore on an exhaust cursor, the socket stays checked
        # out on success but it's checked in on error to avoid semaphore leaks.
        client = await self.async_rs_or_single_client(maxPoolSize=1)
        collection = client.pymongo_test.test
        await collection.drop()
        await collection.insert_many([{} for _ in range(200)])  # More than one batch.
        pool = await async_get_pool(client)
        pool._check_interval_seconds = None  # Never check.

        cursor = collection.find(cursor_type=CursorType.EXHAUST)

        # Initial query succeeds.
        await cursor.next()

        # Cause a network error.
        conn = cursor._sock_mgr.conn
        await conn.conn.close()

        # A getmore fails.
        with self.assertRaises(ConnectionFailure):
            await cursor.to_list()
        self.assertTrue(conn.closed)

        await async_wait_until(
            lambda: len(client._kill_cursors_queue) == 0,
            "waited for all killCursor requests to complete",
        )
        # The socket was closed and the semaphore was decremented.
        self.assertNotIn(conn, pool.conns)
        self.assertEqual(0, pool.requests)

    @async_client_context.require_sync
    def test_gevent_task(self):
        if not gevent_monkey_patched():
            raise SkipTest("Must be running monkey patched by gevent")
        from gevent import spawn

        def poller():
            while True:
                async_client_context.client.pymongo_test.test.insert_one({})

        task = spawn(poller)
        task.kill()
        self.assertTrue(task.dead)

    @async_client_context.require_sync
    def test_gevent_timeout(self):
        if not gevent_monkey_patched():
            raise SkipTest("Must be running monkey patched by gevent")
        from gevent import Timeout, spawn

        client = self.async_rs_or_single_client(maxPoolSize=1)
        coll = client.pymongo_test.test
        coll.insert_one({})

        def contentious_task():
            # The 10 second timeout causes this test to fail without blocking
            # forever if a bug like PYTHON-2334 is reintroduced.
            with Timeout(10):
                coll.find_one({"$where": delay(1)})

        def timeout_task():
            with Timeout(0.5):
                try:
                    coll.find_one({})
                except Timeout:
                    pass

        ct = spawn(contentious_task)
        tt = spawn(timeout_task)
        tt.join(15)
        ct.join(15)
        self.assertTrue(tt.dead)
        self.assertTrue(ct.dead)
        self.assertIsNone(tt.get())
        self.assertIsNone(ct.get())

    @async_client_context.require_sync
    def test_gevent_timeout_when_creating_connection(self):
        if not gevent_monkey_patched():
            raise SkipTest("Must be running monkey patched by gevent")
        from gevent import Timeout, spawn

        client = self.async_rs_or_single_client()
        self.addCleanup(client.close)
        coll = client.pymongo_test.test
        pool = async_get_pool(client)  # type:ignore

        # Patch the pool to delay the connect method.
        def delayed_connect(*args, **kwargs):
            time.sleep(3)
            return pool.__class__.connect(pool, *args, **kwargs)

        pool.connect = delayed_connect

        def timeout_task():
            with Timeout(1):
                try:
                    coll.find_one({})
                    return False
                except Timeout:
                    return True

        tt = spawn(timeout_task)
        tt.join(10)

        # Assert that we got our active_sockets count back
        self.assertEqual(pool.active_sockets, 0)
        # Assert the greenlet is dead
        self.assertTrue(tt.dead)
        # Assert that the Timeout was raised all the way to the try
        self.assertTrue(tt.get())
        # Unpatch the instance.
        del pool.connect


class TestClientLazyConnect(AsyncIntegrationTest):
    """Test concurrent operations on a lazily-connecting MongoClient."""

    def _get_client(self):
        return self.async_rs_or_single_client(connect=False)

    @async_client_context.require_sync
    def test_insert_one(self):
        def reset(collection):
            collection.drop()

        def insert_one(collection, _):
            collection.insert_one({})

        def test(collection):
            self.assertEqual(NTHREADS, collection.count_documents({}))

        lazy_client_trial(reset, insert_one, test, self._get_client)

    @async_client_context.require_sync
    def test_update_one(self):
        def reset(collection):
            collection.drop()
            collection.insert_one({"i": 0})

        # Update doc 10 times.
        def update_one(collection, _):
            collection.update_one({}, {"$inc": {"i": 1}})

        def test(collection):
            self.assertEqual(NTHREADS, collection.find_one()["i"])

        lazy_client_trial(reset, update_one, test, self._get_client)

    @async_client_context.require_sync
    def test_delete_one(self):
        def reset(collection):
            collection.drop()
            collection.insert_many([{"i": i} for i in range(NTHREADS)])

        def delete_one(collection, i):
            collection.delete_one({"i": i})

        def test(collection):
            self.assertEqual(0, collection.count_documents({}))

        lazy_client_trial(reset, delete_one, test, self._get_client)

    @async_client_context.require_sync
    def test_find_one(self):
        results: list = []

        def reset(collection):
            collection.drop()
            collection.insert_one({})
            results[:] = []

        def find_one(collection, _):
            results.append(collection.find_one())

        def test(collection):
            self.assertEqual(NTHREADS, len(results))

        lazy_client_trial(reset, find_one, test, self._get_client)


class TestMongoClientFailover(AsyncMockClientTest):
    async def test_discover_primary(self):
        c = await AsyncMockClient.get_async_mock_client(
            standalones=[],
            members=["a:1", "b:2", "c:3"],
            mongoses=[],
            host="b:2",  # Pass a secondary.
            replicaSet="rs",
            heartbeatFrequencyMS=500,
        )
        self.addAsyncCleanup(c.close)

        await async_wait_until(lambda: len(c.nodes) == 3, "connect")

        self.assertEqual(await c.address, ("a", 1))
        # Fail over.
        c.kill_host("a:1")
        c.mock_primary = "b:2"

        async def predicate():
            return (await c.address) == ("b", 2)

        await async_wait_until(predicate, "wait for server address to be updated")
        # a:1 not longer in nodes.
        self.assertLess(len(c.nodes), 3)

    async def test_reconnect(self):
        # Verify the node list isn't forgotten during a network failure.
        c = await AsyncMockClient.get_async_mock_client(
            standalones=[],
            members=["a:1", "b:2", "c:3"],
            mongoses=[],
            host="b:2",  # Pass a secondary.
            replicaSet="rs",
            retryReads=False,
            serverSelectionTimeoutMS=1000,
        )
        self.addAsyncCleanup(c.close)

        await async_wait_until(lambda: len(c.nodes) == 3, "connect")

        # Total failure.
        c.kill_host("a:1")
        c.kill_host("b:2")
        c.kill_host("c:3")

        # AsyncMongoClient discovers it's alone. The first attempt raises either
        # ServerSelectionTimeoutError or AutoReconnect (from
        # AsyncMockPool.get_socket).
        with self.assertRaises(AutoReconnect):
            await c.db.collection.find_one()

        # But it can reconnect.
        c.revive_host("a:1")
        await (await c._get_topology()).select_servers(
            writable_server_selector, _Op.TEST, server_selection_timeout=10
        )
        self.assertEqual(await c.address, ("a", 1))

    async def _test_network_error(self, operation_callback):
        # Verify only the disconnected server is reset by a network failure.

        # Disable background refresh.
        with client_knobs(heartbeat_frequency=999999):
            c = AsyncMockClient(
                standalones=[],
                members=["a:1", "b:2"],
                mongoses=[],
                host="a:1",
                replicaSet="rs",
                connect=False,
                retryReads=False,
                serverSelectionTimeoutMS=1000,
            )

            self.addAsyncCleanup(c.close)

            # Set host-specific information so we can test whether it is reset.
            c.set_wire_version_range("a:1", 2, MIN_SUPPORTED_WIRE_VERSION)
            c.set_wire_version_range("b:2", 2, MIN_SUPPORTED_WIRE_VERSION + 1)
            await (await c._get_topology()).select_servers(writable_server_selector, _Op.TEST)
            await async_wait_until(lambda: len(c.nodes) == 2, "connect")

            c.kill_host("a:1")

            # AsyncMongoClient is disconnected from the primary. This raises either
            # ServerSelectionTimeoutError or AutoReconnect (from
            # MockPool.get_socket).
            with self.assertRaises(AutoReconnect):
                await operation_callback(c)

            # The primary's description is reset.
            server_a = (await c._get_topology()).get_server_by_address(("a", 1))
            sd_a = server_a.description
            self.assertEqual(SERVER_TYPE.Unknown, sd_a.server_type)
            self.assertEqual(0, sd_a.min_wire_version)
            self.assertEqual(0, sd_a.max_wire_version)

            # ...but not the secondary's.
            server_b = (await c._get_topology()).get_server_by_address(("b", 2))
            sd_b = server_b.description
            self.assertEqual(SERVER_TYPE.RSSecondary, sd_b.server_type)
            self.assertEqual(2, sd_b.min_wire_version)
            self.assertEqual(MIN_SUPPORTED_WIRE_VERSION + 1, sd_b.max_wire_version)

    async def test_network_error_on_query(self):
        async def callback(client):
            return await client.db.collection.find_one()

        await self._test_network_error(callback)

    async def test_network_error_on_insert(self):
        async def callback(client):
            return await client.db.collection.insert_one({})

        await self._test_network_error(callback)

    async def test_network_error_on_update(self):
        async def callback(client):
            return await client.db.collection.update_one({}, {"$unset": "x"})

        await self._test_network_error(callback)

    async def test_network_error_on_replace(self):
        async def callback(client):
            return await client.db.collection.replace_one({}, {})

        await self._test_network_error(callback)

    async def test_network_error_on_delete(self):
        async def callback(client):
            return await client.db.collection.delete_many({})

        await self._test_network_error(callback)


class TestClientPool(AsyncMockClientTest):
    @async_client_context.require_connection
    async def test_rs_client_does_not_maintain_pool_to_arbiters(self):
        listener = CMAPListener()
        c = await AsyncMockClient.get_async_mock_client(
            standalones=[],
            members=["a:1", "b:2", "c:3", "d:4"],
            mongoses=[],
            arbiters=["c:3"],  # c:3 is an arbiter.
            down_hosts=["d:4"],  # d:4 is unreachable.
            host=["a:1", "b:2", "c:3", "d:4"],
            replicaSet="rs",
            minPoolSize=1,  # minPoolSize
            event_listeners=[listener],
        )
        self.addAsyncCleanup(c.close)

        await async_wait_until(lambda: len(c.nodes) == 3, "connect")
        self.assertEqual(await c.address, ("a", 1))
        self.assertEqual(await c.arbiters, {("c", 3)})
        # Assert that we create 2 and only 2 pooled connections.
        await listener.async_wait_for_event(monitoring.ConnectionReadyEvent, 2)
        self.assertEqual(listener.event_count(monitoring.ConnectionCreatedEvent), 2)
        # Assert that we do not create connections to arbiters.
        arbiter = c._topology.get_server_by_address(("c", 3))
        self.assertFalse(arbiter.pool.conns)
        # Assert that we do not create connections to unknown servers.
        arbiter = c._topology.get_server_by_address(("d", 4))
        self.assertFalse(arbiter.pool.conns)
        # Arbiter pool is not marked ready.
        self.assertEqual(listener.event_count(monitoring.PoolReadyEvent), 2)

    @async_client_context.require_connection
    async def test_direct_client_maintains_pool_to_arbiter(self):
        listener = CMAPListener()
        c = await AsyncMockClient.get_async_mock_client(
            standalones=[],
            members=["a:1", "b:2", "c:3"],
            mongoses=[],
            arbiters=["c:3"],  # c:3 is an arbiter.
            host="c:3",
            directConnection=True,
            minPoolSize=1,  # minPoolSize
            event_listeners=[listener],
        )
        self.addAsyncCleanup(c.close)

        await async_wait_until(lambda: len(c.nodes) == 1, "connect")
        self.assertEqual(await c.address, ("c", 3))
        # Wait for the pooled connection to be registered
        await listener.async_wait_for_event(monitoring.ConnectionReadyEvent, 1)
        self.assertEqual(listener.event_count(monitoring.ConnectionCreatedEvent), 1)
        arbiter = c._topology.get_server_by_address(("c", 3))
        await async_wait_until(lambda: len(arbiter.pool.conns) == 1, "create 1 pooled connection")
        # Arbiter pool is marked ready.
        self.assertEqual(listener.event_count(monitoring.PoolReadyEvent), 1)


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