203 lines
8.1 KiB
Python
203 lines
8.1 KiB
Python
# Copyright 2015-present MongoDB, Inc.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
"""Test the topology module's Server Selection Spec implementation."""
|
|
from __future__ import annotations
|
|
|
|
import os
|
|
import sys
|
|
|
|
from pymongo import MongoClient, ReadPreference
|
|
from pymongo.errors import ServerSelectionTimeoutError
|
|
from pymongo.hello import HelloCompat
|
|
from pymongo.operations import _Op
|
|
from pymongo.server_selectors import writable_server_selector
|
|
from pymongo.synchronous.settings import TopologySettings
|
|
from pymongo.synchronous.topology import Topology
|
|
from pymongo.typings import strip_optional
|
|
|
|
sys.path[0:0] = [""]
|
|
|
|
from test import IntegrationTest, client_context, unittest
|
|
from test.utils import (
|
|
EventListener,
|
|
FunctionCallRecorder,
|
|
rs_or_single_client,
|
|
wait_until,
|
|
)
|
|
from test.utils_selection_tests import (
|
|
create_selection_tests,
|
|
get_addresses,
|
|
get_topology_settings_dict,
|
|
make_server_description,
|
|
)
|
|
|
|
# Location of JSON test specifications.
|
|
_TEST_PATH = os.path.join(
|
|
os.path.dirname(os.path.realpath(__file__)),
|
|
os.path.join("server_selection", "server_selection"),
|
|
)
|
|
|
|
|
|
class SelectionStoreSelector:
|
|
"""No-op selector that keeps track of what was passed to it."""
|
|
|
|
def __init__(self):
|
|
self.selection = None
|
|
|
|
def __call__(self, selection):
|
|
self.selection = selection
|
|
return selection
|
|
|
|
|
|
class TestAllScenarios(create_selection_tests(_TEST_PATH)): # type: ignore
|
|
pass
|
|
|
|
|
|
class TestCustomServerSelectorFunction(IntegrationTest):
|
|
@client_context.require_replica_set
|
|
def test_functional_select_max_port_number_host(self):
|
|
# Selector that returns server with highest port number.
|
|
def custom_selector(servers):
|
|
ports = [s.address[1] for s in servers]
|
|
idx = ports.index(max(ports))
|
|
return [servers[idx]]
|
|
|
|
# Initialize client with appropriate listeners.
|
|
listener = EventListener()
|
|
client = rs_or_single_client(server_selector=custom_selector, event_listeners=[listener])
|
|
self.addCleanup(client.close)
|
|
coll = client.get_database("testdb", read_preference=ReadPreference.NEAREST).coll
|
|
self.addCleanup(client.drop_database, "testdb")
|
|
|
|
# Wait the node list to be fully populated.
|
|
def all_hosts_started():
|
|
return len(client.admin.command(HelloCompat.LEGACY_CMD)["hosts"]) == len(
|
|
client._topology._description.readable_servers
|
|
)
|
|
|
|
wait_until(all_hosts_started, "receive heartbeat from all hosts")
|
|
|
|
expected_port = max(
|
|
[strip_optional(n.address[1]) for n in client._topology._description.readable_servers]
|
|
)
|
|
|
|
# Insert 1 record and access it 10 times.
|
|
coll.insert_one({"name": "John Doe"})
|
|
for _ in range(10):
|
|
coll.find_one({"name": "John Doe"})
|
|
|
|
# Confirm all find commands are run against appropriate host.
|
|
for command in listener.started_events:
|
|
if command.command_name == "find":
|
|
self.assertEqual(command.connection_id[1], expected_port)
|
|
|
|
def test_invalid_server_selector(self):
|
|
# Client initialization must fail if server_selector is not callable.
|
|
for selector_candidate in [[], 10, "string", {}]:
|
|
with self.assertRaisesRegex(ValueError, "must be a callable"):
|
|
MongoClient(connect=False, server_selector=selector_candidate)
|
|
|
|
# None value for server_selector is OK.
|
|
MongoClient(connect=False, server_selector=None)
|
|
|
|
@client_context.require_replica_set
|
|
def test_selector_called(self):
|
|
selector = FunctionCallRecorder(lambda x: x)
|
|
|
|
# Client setup.
|
|
mongo_client = rs_or_single_client(server_selector=selector)
|
|
test_collection = mongo_client.testdb.test_collection
|
|
self.addCleanup(mongo_client.close)
|
|
self.addCleanup(mongo_client.drop_database, "testdb")
|
|
|
|
# Do N operations and test selector is called at least N times.
|
|
test_collection.insert_one({"age": 20, "name": "John"})
|
|
test_collection.insert_one({"age": 31, "name": "Jane"})
|
|
test_collection.update_one({"name": "Jane"}, {"$set": {"age": 21}})
|
|
test_collection.find_one({"name": "Roe"})
|
|
self.assertGreaterEqual(selector.call_count, 4)
|
|
|
|
@client_context.require_replica_set
|
|
def test_latency_threshold_application(self):
|
|
selector = SelectionStoreSelector()
|
|
|
|
scenario_def: dict = {
|
|
"topology_description": {
|
|
"type": "ReplicaSetWithPrimary",
|
|
"servers": [
|
|
{"address": "b:27017", "avg_rtt_ms": 10000, "type": "RSSecondary", "tag": {}},
|
|
{"address": "c:27017", "avg_rtt_ms": 20000, "type": "RSSecondary", "tag": {}},
|
|
{"address": "a:27017", "avg_rtt_ms": 30000, "type": "RSPrimary", "tag": {}},
|
|
],
|
|
}
|
|
}
|
|
|
|
# Create & populate Topology such that all but one server is too slow.
|
|
rtt_times = [srv["avg_rtt_ms"] for srv in scenario_def["topology_description"]["servers"]]
|
|
min_rtt_idx = rtt_times.index(min(rtt_times))
|
|
seeds, hosts = get_addresses(scenario_def["topology_description"]["servers"])
|
|
settings = get_topology_settings_dict(
|
|
heartbeat_frequency=1, local_threshold_ms=1, seeds=seeds, server_selector=selector
|
|
)
|
|
topology = Topology(TopologySettings(**settings))
|
|
topology.open()
|
|
for server in scenario_def["topology_description"]["servers"]:
|
|
server_description = make_server_description(server, hosts)
|
|
topology.on_change(server_description)
|
|
|
|
# Invoke server selection and assert no filtering based on latency
|
|
# prior to custom server selection logic kicking in.
|
|
server = topology.select_server(ReadPreference.NEAREST, _Op.TEST)
|
|
assert selector.selection is not None
|
|
self.assertEqual(len(selector.selection), len(topology.description.server_descriptions()))
|
|
|
|
# Ensure proper filtering based on latency after custom selection.
|
|
self.assertEqual(server.description.address, seeds[min_rtt_idx])
|
|
|
|
@client_context.require_replica_set
|
|
def test_server_selector_bypassed(self):
|
|
selector = FunctionCallRecorder(lambda x: x)
|
|
|
|
scenario_def = {
|
|
"topology_description": {
|
|
"type": "ReplicaSetNoPrimary",
|
|
"servers": [
|
|
{"address": "b:27017", "avg_rtt_ms": 10000, "type": "RSSecondary", "tag": {}},
|
|
{"address": "c:27017", "avg_rtt_ms": 20000, "type": "RSSecondary", "tag": {}},
|
|
{"address": "a:27017", "avg_rtt_ms": 30000, "type": "RSSecondary", "tag": {}},
|
|
],
|
|
}
|
|
}
|
|
|
|
# Create & populate Topology such that no server is writeable.
|
|
seeds, hosts = get_addresses(scenario_def["topology_description"]["servers"])
|
|
settings = get_topology_settings_dict(
|
|
heartbeat_frequency=1, local_threshold_ms=1, seeds=seeds, server_selector=selector
|
|
)
|
|
topology = Topology(TopologySettings(**settings))
|
|
topology.open()
|
|
for server in scenario_def["topology_description"]["servers"]:
|
|
server_description = make_server_description(server, hosts)
|
|
topology.on_change(server_description)
|
|
|
|
# Invoke server selection and assert no calls to our custom selector.
|
|
with self.assertRaisesRegex(ServerSelectionTimeoutError, "No primary available for writes"):
|
|
topology.select_server(writable_server_selector, _Op.TEST, server_selection_timeout=0.1)
|
|
self.assertEqual(selector.call_count, 0)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|