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