222 lines
8.4 KiB
Python
222 lines
8.4 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
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from pymongo import ReadPreference
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from pymongo.errors import ServerSelectionTimeoutError
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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 client_context, unittest, IntegrationTest
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from test.utils import rs_or_single_client, wait_until, EventListener
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from test.utils_selection_tests import (
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create_selection_tests, get_addresses, get_topology_settings_dict,
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make_server_description)
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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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class CallCountSelector(object):
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"""No-op selector that keeps track of how many times it is called."""
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def __init__(self):
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self.call_count = 0
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def __call__(self, servers):
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self.call_count += 1
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return servers
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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(
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server_selector=custom_selector, event_listeners=[listener])
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self.addCleanup(client.close)
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coll = client.get_database(
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'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('isMaster')['hosts']) ==
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len(client._topology._description.readable_servers))
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wait_until(all_hosts_started, 'receive heartbeat from all hosts')
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expected_port = max([
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n.address[1]
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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(
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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 = CallCountSelector()
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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.drop_database, 'testdb')
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self.addCleanup(mongo_client.close)
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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', 'servers': [
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{'address': 'b:27017',
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'avg_rtt_ms': 10000,
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'type': 'RSSecondary',
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'tag': {}},
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{'address': 'c:27017',
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'avg_rtt_ms': 20000,
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'type': 'RSSecondary',
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'tag': {}},
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{'address': 'a:27017',
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'avg_rtt_ms': 30000,
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'type': 'RSPrimary',
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'tag': {}},
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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
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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(
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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,
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server_selector=selector)
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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(
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len(selector.selection),
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len(topology.description.server_descriptions()))
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# Ensure proper filtering based on latency after custom selection.
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self.assertEqual(
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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 = CallCountSelector()
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scenario_def = {
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'topology_description': {
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'type': 'ReplicaSetNoPrimary', 'servers': [
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{'address': 'b:27017',
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'avg_rtt_ms': 10000,
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'type': 'RSSecondary',
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'tag': {}},
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{'address': 'c:27017',
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'avg_rtt_ms': 20000,
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'type': 'RSSecondary',
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'tag': {}},
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{'address': 'a:27017',
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'avg_rtt_ms': 30000,
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'type': 'RSSecondary',
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'tag': {}},
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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(
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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,
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server_selector=selector)
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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(
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ServerSelectionTimeoutError, 'No primary available for writes'):
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topology.select_server(
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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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