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# Copyright 2021 gRPC authors.
#
# 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 logging
from typing import List
from absl import flags
from absl.testing import absltest
from framework import xds_k8s_testcase
logger = logging.getLogger(__name__)
flags.adopt_module_key_flags(xds_k8s_testcase)
# Type aliases
_XdsTestServer = xds_k8s_testcase.XdsTestServer
_XdsTestClient = xds_k8s_testcase.XdsTestClient
class RoundRobinTest(xds_k8s_testcase.RegularXdsKubernetesTestCase):
def test_round_robin(self) -> None:
REPLICA_COUNT = 2
with self.subTest("00_create_health_check"):
self.td.create_health_check()
with self.subTest("01_create_backend_services"):
self.td.create_backend_service()
with self.subTest("02_create_url_map"):
self.td.create_url_map(self.server_xds_host, self.server_xds_port)
with self.subTest("03_create_target_proxy"):
self.td.create_target_proxy()
with self.subTest("04_create_forwarding_rule"):
self.td.create_forwarding_rule(self.server_xds_port)
test_servers: List[_XdsTestServer]
with self.subTest("05_start_test_servers"):
test_servers = self.startTestServers(replica_count=REPLICA_COUNT)
with self.subTest("06_add_server_backends_to_backend_services"):
self.setupServerBackends()
test_client: _XdsTestClient
with self.subTest("07_start_test_client"):
test_client = self.startTestClient(test_servers[0])
with self.subTest("08_test_client_xds_config_exists"):
self.assertXdsConfigExists(test_client)
with self.subTest("09_test_server_received_rpcs_from_test_client"):
self.assertSuccessfulRpcs(test_client)
with self.subTest("10_round_robin"):
num_rpcs = 100
expected_rpcs_per_replica = num_rpcs / REPLICA_COUNT
rpcs_by_peer = self.getClientRpcStats(
test_client, num_rpcs
).rpcs_by_peer
total_requests_received = sum(rpcs_by_peer[x] for x in rpcs_by_peer)
self.assertEqual(
total_requests_received, num_rpcs, "Wrong number of RPCS"
)
for server in test_servers:
hostname = server.hostname
self.assertIn(
hostname,
rpcs_by_peer,
f"Server {hostname} did not receive RPCs",
)
self.assertLessEqual(
abs(rpcs_by_peer[hostname] - expected_rpcs_per_replica),
1,
f"Wrong number of RPCs for server {hostname}",
)
if __name__ == "__main__":
absltest.main(failfast=True)
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