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# Copyright 2015-present MongoDB, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Utilities for testing Server Selection and Max Staleness."""
from __future__ import annotations
import datetime
import os
import sys
from test.asynchronous import AsyncPyMongoTestCase
from test.asynchronous.utils import AsyncMockPool
sys.path[0:0] = [""]
from test import unittest
from test.pymongo_mocks import DummyMonitor
from test.utils_selection_tests_shared import (
get_addresses,
get_topology_type_name,
make_server_description,
)
from test.utils_shared import parse_read_preference
from bson import json_util
from pymongo.asynchronous.settings import TopologySettings
from pymongo.asynchronous.topology import Topology
from pymongo.common import HEARTBEAT_FREQUENCY
from pymongo.errors import AutoReconnect, ConfigurationError
from pymongo.operations import _Op
from pymongo.server_selectors import writable_server_selector
_IS_SYNC = False
def get_topology_settings_dict(**kwargs):
settings = {
"monitor_class": DummyMonitor,
"heartbeat_frequency": HEARTBEAT_FREQUENCY,
"pool_class": AsyncMockPool,
}
settings.update(kwargs)
return settings
async def create_topology(scenario_def, **kwargs):
# Initialize topologies.
if "heartbeatFrequencyMS" in scenario_def:
frequency = int(scenario_def["heartbeatFrequencyMS"]) / 1000.0
else:
frequency = HEARTBEAT_FREQUENCY
seeds, hosts = get_addresses(scenario_def["topology_description"]["servers"])
topology_type = get_topology_type_name(scenario_def)
if topology_type == "LoadBalanced":
kwargs.setdefault("load_balanced", True)
# Force topology description to ReplicaSet
elif topology_type in ["ReplicaSetNoPrimary", "ReplicaSetWithPrimary"]:
kwargs.setdefault("replica_set_name", "rs")
settings = get_topology_settings_dict(heartbeat_frequency=frequency, seeds=seeds, **kwargs)
# "Eligible servers" is defined in the server selection spec as
# the set of servers matching both the ReadPreference's mode
# and tag sets.
topology = Topology(TopologySettings(**settings))
await topology.open()
# Update topologies with server descriptions.
for server in scenario_def["topology_description"]["servers"]:
server_description = make_server_description(server, hosts)
await topology.on_change(server_description)
# Assert that descriptions match
assert (
scenario_def["topology_description"]["type"] == topology.description.topology_type_name
), topology.description.topology_type_name
return topology
def create_test(scenario_def):
async def run_scenario(self):
_, hosts = get_addresses(scenario_def["topology_description"]["servers"])
# "Eligible servers" is defined in the server selection spec as
# the set of servers matching both the ReadPreference's mode
# and tag sets.
top_latency = await create_topology(scenario_def)
# "In latency window" is defined in the server selection
# spec as the subset of suitable_servers that falls within the
# allowable latency window.
top_suitable = await create_topology(scenario_def, local_threshold_ms=1000000)
# Create server selector.
if scenario_def.get("operation") == "write":
pref = writable_server_selector
else:
# Make first letter lowercase to match read_pref's modes.
pref_def = scenario_def["read_preference"]
if scenario_def.get("error"):
with self.assertRaises((ConfigurationError, ValueError)):
# Error can be raised when making Read Pref or selecting.
pref = parse_read_preference(pref_def)
await top_latency.select_server(pref, _Op.TEST)
return
pref = parse_read_preference(pref_def)
# Select servers.
if not scenario_def.get("suitable_servers"):
with self.assertRaises(AutoReconnect):
await top_suitable.select_server(pref, _Op.TEST, server_selection_timeout=0)
return
if not scenario_def["in_latency_window"]:
with self.assertRaises(AutoReconnect):
await top_latency.select_server(pref, _Op.TEST, server_selection_timeout=0)
return
actual_suitable_s = await top_suitable.select_servers(
pref, _Op.TEST, server_selection_timeout=0
)
actual_latency_s = await top_latency.select_servers(
pref, _Op.TEST, server_selection_timeout=0
)
expected_suitable_servers = {}
for server in scenario_def["suitable_servers"]:
server_description = make_server_description(server, hosts)
expected_suitable_servers[server["address"]] = server_description
actual_suitable_servers = {}
for s in actual_suitable_s:
actual_suitable_servers[
"%s:%d" % (s.description.address[0], s.description.address[1])
] = s.description
self.assertEqual(len(actual_suitable_servers), len(expected_suitable_servers))
for k, actual in actual_suitable_servers.items():
expected = expected_suitable_servers[k]
self.assertEqual(expected.address, actual.address)
self.assertEqual(expected.server_type, actual.server_type)
self.assertEqual(expected.round_trip_time, actual.round_trip_time)
self.assertEqual(expected.tags, actual.tags)
self.assertEqual(expected.all_hosts, actual.all_hosts)
expected_latency_servers = {}
for server in scenario_def["in_latency_window"]:
server_description = make_server_description(server, hosts)
expected_latency_servers[server["address"]] = server_description
actual_latency_servers = {}
for s in actual_latency_s:
actual_latency_servers[
"%s:%d" % (s.description.address[0], s.description.address[1])
] = s.description
self.assertEqual(len(actual_latency_servers), len(expected_latency_servers))
for k, actual in actual_latency_servers.items():
expected = expected_latency_servers[k]
self.assertEqual(expected.address, actual.address)
self.assertEqual(expected.server_type, actual.server_type)
self.assertEqual(expected.round_trip_time, actual.round_trip_time)
self.assertEqual(expected.tags, actual.tags)
self.assertEqual(expected.all_hosts, actual.all_hosts)
return run_scenario
def create_selection_tests(test_dir):
class TestAllScenarios(AsyncPyMongoTestCase):
pass
for dirpath, _, filenames in os.walk(test_dir):
dirname = os.path.split(dirpath)
dirname = os.path.split(dirname[-2])[-1] + "_" + dirname[-1]
for filename in filenames:
if os.path.splitext(filename)[1] != ".json":
continue
with open(os.path.join(dirpath, filename)) as scenario_stream:
scenario_def = json_util.loads(scenario_stream.read())
# Construct test from scenario.
new_test = create_test(scenario_def)
test_name = f"test_{dirname}_{os.path.splitext(filename)[0]}"
new_test.__name__ = test_name
setattr(TestAllScenarios, new_test.__name__, new_test)
return TestAllScenarios
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