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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 cassandra.cluster import ExecutionProfile, EXEC_PROFILE_DEFAULT
from cassandra.policies import HostFilterPolicy, RoundRobinPolicy, SimpleConvictionPolicy, \
WhiteListRoundRobinPolicy
from cassandra.pool import Host
from cassandra.connection import DefaultEndPoint
from tests.integration import local, use_singledc, TestCluster
from concurrent.futures import wait as wait_futures
def setup_module():
use_singledc()
class HostFilterPolicyTests(unittest.TestCase):
def test_predicate_changes(self):
"""
Test to validate host filter reacts correctly when the predicate return
a different subset of the hosts
HostFilterPolicy
@since 3.8
@jira_ticket PYTHON-961
@expected_result the excluded hosts are ignored
@test_category policy
"""
external_event = True
contact_point = DefaultEndPoint("127.0.0.1")
single_host = {Host(contact_point, SimpleConvictionPolicy)}
all_hosts = {Host(DefaultEndPoint("127.0.0.{}".format(i)), SimpleConvictionPolicy) for i in (1, 2, 3)}
predicate = lambda host: host.endpoint == contact_point if external_event else True
hfp = ExecutionProfile(
load_balancing_policy=HostFilterPolicy(RoundRobinPolicy(), predicate=predicate)
)
cluster = TestCluster(contact_points=(contact_point,), execution_profiles={EXEC_PROFILE_DEFAULT: hfp},
topology_event_refresh_window=0,
status_event_refresh_window=0)
session = cluster.connect(wait_for_all_pools=True)
queried_hosts = set()
for _ in range(10):
response = session.execute("SELECT * from system.local")
queried_hosts.update(response.response_future.attempted_hosts)
self.assertEqual(queried_hosts, single_host)
external_event = False
futures = session.update_created_pools()
wait_futures(futures, timeout=cluster.connect_timeout)
queried_hosts = set()
for _ in range(10):
response = session.execute("SELECT * from system.local")
queried_hosts.update(response.response_future.attempted_hosts)
self.assertEqual(queried_hosts, all_hosts)
class WhiteListRoundRobinPolicyTests(unittest.TestCase):
@local
def test_only_connects_to_subset(self):
only_connect_hosts = {"127.0.0.1", "127.0.0.2"}
white_list = ExecutionProfile(load_balancing_policy=WhiteListRoundRobinPolicy(only_connect_hosts))
cluster = TestCluster(execution_profiles={"white_list": white_list})
#cluster = Cluster(load_balancing_policy=WhiteListRoundRobinPolicy(only_connect_hosts))
session = cluster.connect(wait_for_all_pools=True)
queried_hosts = set()
for _ in range(10):
response = session.execute('SELECT * from system.local', execution_profile="white_list")
queried_hosts.update(response.response_future.attempted_hosts)
queried_hosts = set(host.address for host in queried_hosts)
self.assertEqual(queried_hosts, only_connect_hosts)
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