123 lines
3.7 KiB
Python
123 lines
3.7 KiB
Python
#!/usr/bin/env python
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# Copyright (c) 2014 Hewlett-Packard Development Company, L.P.
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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 notification method.
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"""
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import logging
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import logging.config
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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 yaml
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from notification_engine import NotificationEngine
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from retry_engine import RetryEngine
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log = logging.getLogger(__name__)
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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 uncommited 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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for process in processors:
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try:
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if process.is_alive():
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process.terminate() # Sends sigterm which any processes after a notification is sent attempt to handle
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except Exception:
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pass
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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:
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pass
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sys.exit(0)
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def start_process(proccess_type, config):
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log.info("start process: {}".format(proccess_type))
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p = proccess_type(config)
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p.run()
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def main(argv=None):
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if argv is None:
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argv = sys.argv
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if len(argv) == 2:
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config_file = argv[1]
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elif len(argv) > 2:
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print("Usage: " + argv[0] + " <config_file>")
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print("Config file defaults to /etc/monasca/notification.yaml")
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return 1
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else:
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config_file = '/etc/monasca/notification.yaml'
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config = yaml.load(open(config_file, 'r'))
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# Setup logging
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logging.config.dictConfig(config['logging'])
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for proc in range(0, config['processors']['notification']['number']):
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processors.append(multiprocessing.Process(
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target=start_process, args=(NotificationEngine, config)))
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processors.append(multiprocessing.Process(
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target=start_process, args=(RetryEngine, config)))
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# Start
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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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for process in processors:
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process.terminate()
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if __name__ == "__main__":
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sys.exit(main())
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