# Copyright 2015 Hewlett-Packard Development Company, L.P.
#
# 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 time
from concurrent import futures
from oslo_config import cfg
from oslo_db import exception as db_exc
from oslo_log import log as logging
from oslo_utils import excutils
from octavia.controller.worker import controller_worker as cw
from octavia.db import api as db_api
from octavia.db import repositories as repo
CONF = cfg.CONF
LOG = logging.getLogger(__name__)
[docs]class HealthManager(object):
def __init__(self):
self.cw = cw.ControllerWorker()
self.threads = CONF.health_manager.failover_threads
[docs] def health_check(self):
amp_health_repo = repo.AmphoraHealthRepository()
with futures.ThreadPoolExecutor(max_workers=self.threads) as executor:
# Don't start checking immediately, as the health manager may
# have been down for a while and amphorae not able to check in.
LOG.debug("Pausing before starting health check")
time.sleep(CONF.health_manager.heartbeat_timeout)
while True:
LOG.debug("Starting amphora health check")
failover_count = 0
while True:
lock_session = db_api.get_session(autocommit=False)
amp = None
try:
amp = amp_health_repo.get_stale_amphora(lock_session)
lock_session.commit()
except db_exc.DBDeadlock:
LOG.debug('Database reports deadlock. Skipping.')
try:
lock_session.rollback()
except Exception:
pass
except db_exc.RetryRequest:
LOG.debug('Database is requesting a retry. Skipping.')
try:
lock_session.rollback()
except Exception:
pass
except Exception:
with excutils.save_and_reraise_exception():
try:
lock_session.rollback()
except Exception:
pass
if amp is None:
break
failover_count += 1
LOG.info("Stale amphora's id is: %s",
amp.amphora_id)
executor.submit(self.cw.failover_amphora,
amp.amphora_id)
if failover_count > 0:
LOG.info("Failed over %s amphora",
failover_count)
time.sleep(CONF.health_manager.health_check_interval)
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