| # Licensed to the Apache Software Foundation (ASF) under one |
| # or more contributor license agreements. See the NOTICE file |
| # distributed with this work for additional information |
| # regarding copyright ownership. The ASF licenses this file |
| # to you 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. |
| import unittest |
| from unittest.mock import Mock |
| |
| from cassandra.pool import Host |
| from cassandra.policies import RoundRobinPolicy |
| |
| from cassandra.policies import DSELoadBalancingPolicy |
| |
| |
| class ClusterMetaMock(object): |
| def __init__(self, hosts=None): |
| self.hosts = hosts or {} |
| |
| def get_host(self, addr): |
| return self.hosts.get(addr) |
| |
| |
| class DSELoadBalancingPolicyTest(unittest.TestCase): |
| |
| def test_no_target(self): |
| node_count = 4 |
| hosts = list(range(node_count)) |
| policy = DSELoadBalancingPolicy(RoundRobinPolicy()) |
| policy.populate(Mock(metadata=ClusterMetaMock()), hosts) |
| for _ in range(node_count): |
| query_plan = list(policy.make_query_plan(None, Mock(target_host=None))) |
| self.assertEqual(sorted(query_plan), hosts) |
| |
| def test_status_updates(self): |
| node_count = 4 |
| hosts = list(range(node_count)) |
| policy = DSELoadBalancingPolicy(RoundRobinPolicy()) |
| policy.populate(Mock(metadata=ClusterMetaMock()), hosts) |
| policy.on_down(0) |
| policy.on_remove(1) |
| policy.on_up(4) |
| policy.on_add(5) |
| query_plan = list(policy.make_query_plan()) |
| self.assertEqual(sorted(query_plan), [2, 3, 4, 5]) |
| |
| def test_no_live_nodes(self): |
| hosts = [0, 1, 2, 3] |
| policy = RoundRobinPolicy() |
| policy.populate(None, hosts) |
| |
| for i in range(4): |
| policy.on_down(i) |
| |
| query_plan = list(policy.make_query_plan()) |
| self.assertEqual(query_plan, []) |
| |
| def test_target_no_host(self): |
| node_count = 4 |
| hosts = list(range(node_count)) |
| policy = DSELoadBalancingPolicy(RoundRobinPolicy()) |
| policy.populate(Mock(metadata=ClusterMetaMock()), hosts) |
| query_plan = list(policy.make_query_plan(None, Mock(target_host='127.0.0.1'))) |
| self.assertEqual(sorted(query_plan), hosts) |
| |
| def test_target_host_down(self): |
| node_count = 4 |
| hosts = [Host(i, Mock()) for i in range(node_count)] |
| target_host = hosts[1] |
| |
| policy = DSELoadBalancingPolicy(RoundRobinPolicy()) |
| policy.populate(Mock(metadata=ClusterMetaMock({'127.0.0.1': target_host})), hosts) |
| query_plan = list(policy.make_query_plan(None, Mock(target_host='127.0.0.1'))) |
| self.assertEqual(sorted(query_plan), hosts) |
| |
| target_host.is_up = False |
| policy.on_down(target_host) |
| query_plan = list(policy.make_query_plan(None, Mock(target_host='127.0.0.1'))) |
| self.assertNotIn(target_host, query_plan) |
| |
| def test_target_host_nominal(self): |
| node_count = 4 |
| hosts = [Host(i, Mock()) for i in range(node_count)] |
| target_host = hosts[1] |
| target_host.is_up = True |
| |
| policy = DSELoadBalancingPolicy(RoundRobinPolicy()) |
| policy.populate(Mock(metadata=ClusterMetaMock({'127.0.0.1': target_host})), hosts) |
| for _ in range(10): |
| query_plan = list(policy.make_query_plan(None, Mock(target_host='127.0.0.1'))) |
| self.assertEqual(sorted(query_plan), hosts) |
| self.assertEqual(query_plan[0], target_host) |
