50 lines
1.7 KiB
Python
50 lines
1.7 KiB
Python
#
|
|
# 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 random
|
|
import time
|
|
|
|
from neutron.db import api as db_api
|
|
|
|
from neutron_lib.services import base as service_base
|
|
from oslo_db import exception as db_exc
|
|
from oslo_log import log as logging
|
|
from sqlalchemy.orm import session as se
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
|
|
class LokiPlugin(service_base.ServicePluginBase):
|
|
"""Loki brings us the gift of sporadic database failures and delays."""
|
|
|
|
def __init__(self):
|
|
super(LokiPlugin, self).__init__()
|
|
db_api.sqla_listen(se.Session, 'before_flush', self.random_deadlock)
|
|
db_api.sqla_listen(se.Session, 'loaded_as_persistent',
|
|
self.random_delay)
|
|
|
|
def random_deadlock(self, session, flush_context, instances):
|
|
if random.randrange(0, 51) > 49: # 1/50 probability
|
|
raise db_exc.DBDeadlock()
|
|
|
|
def random_delay(self, session, instance):
|
|
if random.randrange(0, 201) > 199: # 1/200 probability
|
|
LOG.debug("Loki has delayed loading of instance %s", instance)
|
|
time.sleep(1)
|
|
|
|
def get_plugin_type(self):
|
|
return "loki"
|
|
|
|
def get_plugin_description(self):
|
|
return "Injects deadlocks and delays into database operations."
|