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# Copyright DataStax, 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.
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)
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