49 lines
1.7 KiB
Python
49 lines
1.7 KiB
Python
#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import random
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import time
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from neutron_lib.db import api as db_api
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from neutron_lib.services import base as service_base
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from oslo_db import exception as db_exc
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from oslo_log import log as logging
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from sqlalchemy.orm import session as se
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LOG = logging.getLogger(__name__)
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class LokiPlugin(service_base.ServicePluginBase):
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"""Loki brings us the gift of sporadic database failures and delays."""
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def __init__(self):
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super(LokiPlugin, self).__init__()
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db_api.sqla_listen(se.Session, 'before_flush', self.random_deadlock)
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db_api.sqla_listen(se.Session, 'loaded_as_persistent',
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self.random_delay)
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def random_deadlock(self, session, flush_context, instances):
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if random.randrange(0, 51) > 49: # 1/50 probability
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raise db_exc.DBDeadlock()
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def random_delay(self, session, instance):
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if random.randrange(0, 201) > 199: # 1/200 probability
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LOG.debug("Loki has delayed loading of instance %s", instance)
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time.sleep(1)
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def get_plugin_type(self):
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return "loki"
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def get_plugin_description(self):
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return "Injects deadlocks and delays into database operations."
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