# Copyright 2013-2017 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.

from tests.integration import use_singledc

try:

import unittest2 as unittest

except ImportError:

import unittest # noqa

from cassandra.cluster import Cluster, ExecutionProfile

from cassandra.policies import HostFilterPolicy, RoundRobinPolicy, SimpleConvictionPolicy, WhiteListRoundRobinPolicy

from cassandra.pool import Host

from tests.integration import PROTOCOL_VERSION, local

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 hostfilter 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 = "127.0.0.1"

single_host = {Host(contact_point, SimpleConvictionPolicy)}

all_hosts = {Host("127.0.0.{}".format(i), SimpleConvictionPolicy) for i in (1, 2, 3)}

predicate = lambda host: host.address == contact_point if external_event else True

cluster = Cluster((contact_point,), load_balancing_policy=HostFilterPolicy(RoundRobinPolicy(),

predicate=predicate),

protocol_version=PROTOCOL_VERSION, 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 = Cluster(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)