138 lines
4.2 KiB
Python
138 lines
4.2 KiB
Python
# (C) Copyright 2014-2017 Hewlett Packard Enterprise Development LP
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# Copyright 2017 FUJITSU LIMITED
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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""" Notification Engine
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This engine reads alarms from Kafka and then notifies the customer using their configured
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notification method.
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"""
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import multiprocessing
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import os
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import signal
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import sys
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import time
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import warnings
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from oslo_log import log
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from monasca_notification import config
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from monasca_notification import notification_engine
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from monasca_notification import periodic_engine
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from monasca_notification import retry_engine
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LOG = log.getLogger(__name__)
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CONF = config.CONF
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processors = [] # global list to facilitate clean signal handling
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exiting = False
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def clean_exit(signum, frame=None):
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"""Exit all processes attempting to finish uncommitted active work before exit.
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Can be called on an os signal or no zookeeper losing connection.
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"""
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global exiting
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if exiting:
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# Since this is set up as a handler for SIGCHLD when this kills one
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# child it gets another signal, the global exiting avoids this running
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# multiple times.
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LOG.debug('Exit in progress clean_exit received additional signal %s' % signum)
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return
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LOG.info('Received signal %s, beginning graceful shutdown.' % signum)
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exiting = True
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wait_for_exit = False
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for process in processors:
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try:
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if process.is_alive():
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# Sends sigterm which any processes after a notification is sent attempt to handle
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process.terminate()
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wait_for_exit = True
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except Exception: # nosec
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# There is really nothing to do if the kill fails, so just go on.
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# The # nosec keeps bandit from reporting this as a security issue
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pass
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# wait for a couple seconds to give the subprocesses a chance to shut down correctly.
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if wait_for_exit:
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time.sleep(2)
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# Kill everything, that didn't already die
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for child in multiprocessing.active_children():
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LOG.debug('Killing pid %s' % child.pid)
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try:
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os.kill(child.pid, signal.SIGKILL)
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except Exception: # nosec
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# There is really nothing to do if the kill fails, so just go on.
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# The # nosec keeps bandit from reporting this as a security issue
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pass
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if signum == signal.SIGTERM:
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sys.exit(0)
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sys.exit(signum)
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def start_process(process_type, *args):
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LOG.info("start process: {}".format(process_type))
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p = process_type(*args)
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p.run()
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def main(argv=None):
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warnings.simplefilter('always')
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config.parse_args(argv=argv)
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for proc in range(0, CONF.notification_processor.number):
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processors.append(multiprocessing.Process(
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target=start_process,
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args=(notification_engine.NotificationEngine,))
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)
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processors.append(multiprocessing.Process(
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target=start_process,
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args=(retry_engine.RetryEngine,))
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)
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if 60 in CONF.kafka.periodic:
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processors.append(multiprocessing.Process(
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target=start_process,
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args=(periodic_engine.PeriodicEngine, 60))
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)
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try:
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LOG.info('Starting processes')
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for process in processors:
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process.start()
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# The signal handlers must be added after the processes start otherwise
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# they run on all processes
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signal.signal(signal.SIGCHLD, clean_exit)
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signal.signal(signal.SIGINT, clean_exit)
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signal.signal(signal.SIGTERM, clean_exit)
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while True:
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time.sleep(10)
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except Exception:
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LOG.exception('Error! Exiting.')
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clean_exit(signal.SIGKILL)
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if __name__ == "__main__":
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sys.exit(main(sys.argv[1:]))
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