200 lines
7.3 KiB
Python
200 lines
7.3 KiB
Python
# (C) Copyright 2014-2017 Hewlett Packard Enterprise Development LP
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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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"""Persister Module
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The Persister reads metrics and alarms from Kafka and then stores them
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in into either Influxdb or Cassandra
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Start the perister as stand-alone process by running 'persister.py
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--config-file <config file>'
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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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from monasca_common.simport import simport
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from oslo_config import cfg
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from oslo_log import log
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from monasca_persister.repositories import persister
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from monasca_persister import version
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LOG = log.getLogger(__name__)
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zookeeper_opts = [cfg.StrOpt('uri'),
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cfg.IntOpt('partition_interval_recheck_seconds')]
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zookeeper_group = cfg.OptGroup(name='zookeeper', title='zookeeper')
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cfg.CONF.register_group(zookeeper_group)
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cfg.CONF.register_opts(zookeeper_opts, zookeeper_group)
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kafka_common_opts = [cfg.StrOpt('uri'),
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cfg.StrOpt('group_id'),
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cfg.StrOpt('topic'),
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cfg.StrOpt('consumer_id'),
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cfg.StrOpt('client_id'),
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cfg.IntOpt('database_batch_size'),
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cfg.IntOpt('max_wait_time_seconds'),
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cfg.IntOpt('fetch_size_bytes'),
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cfg.IntOpt('buffer_size'),
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cfg.IntOpt('max_buffer_size'),
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cfg.StrOpt('zookeeper_path'),
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cfg.IntOpt('num_processors')]
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kafka_metrics_opts = kafka_common_opts
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kafka_alarm_history_opts = kafka_common_opts
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kafka_metrics_group = cfg.OptGroup(name='kafka_metrics', title='kafka_metrics')
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kafka_alarm_history_group = cfg.OptGroup(name='kafka_alarm_history',
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title='kafka_alarm_history')
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cfg.CONF.register_group(kafka_metrics_group)
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cfg.CONF.register_group(kafka_alarm_history_group)
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cfg.CONF.register_opts(kafka_metrics_opts, kafka_metrics_group)
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cfg.CONF.register_opts(kafka_alarm_history_opts, kafka_alarm_history_group)
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repositories_opts = [
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cfg.StrOpt('metrics_driver', help='The repository driver to use for metrics'),
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cfg.StrOpt('alarm_state_history_driver', help='The repository driver to use for alarm state history')]
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repositories_group = cfg.OptGroup(name='repositories', title='repositories')
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cfg.CONF.register_group(repositories_group)
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cfg.CONF.register_opts(repositories_opts, repositories_group)
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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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process.terminate() # Sends sigterm which any processes after a notification is sent attempt to handle
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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(respository, kafka_config):
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LOG.info("start process: {}".format(respository))
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m_persister = persister.Persister(kafka_config, cfg.CONF.zookeeper,
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respository)
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m_persister.run()
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def _init_config():
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log.register_options(cfg.CONF)
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log.set_defaults()
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cfg.CONF(prog='persister',
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project='monasca',
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version=version.version_str,
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description='Persists metrics & alarm history in TSDB')
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log.setup(cfg.CONF, 'monasca-persister', version=version.version_str)
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def main():
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"""Start persister."""
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_init_config()
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metric_repository = simport.load(cfg.CONF.repositories.metrics_driver)
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alarm_state_history_repository = simport.load(cfg.CONF.repositories.alarm_state_history_driver)
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# Add processors for metrics topic
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for proc in range(0, cfg.CONF.kafka_metrics.num_processors):
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processors.append(multiprocessing.Process(
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target=start_process, args=(metric_repository, cfg.CONF.kafka_metrics)))
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# Add processors for alarm history topic
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for proc in range(0, cfg.CONF.kafka_alarm_history.num_processors):
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processors.append(multiprocessing.Process(
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target=start_process, args=(alarm_state_history_repository, cfg.CONF.kafka_alarm_history)))
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# Start
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try:
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LOG.info('''
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_____
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/ \ ____ ____ _____ ______ ____ _____
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/ \ / \ / _ \ / \\\__ \ / ___// ___\\\__ \\
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/ Y ( <_> ) | \/ __ \_\___ \\ \___ / __ \\_
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\____|__ /\____/|___| (____ /____ >\___ >____ /
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\/ \/ \/ \/ \/ \/
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__________ .__ __
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\______ \ ___________ _____|__| _______/ |_ ___________
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| ___// __ \_ __ \/ ___/ |/ ___/\ __\/ __ \_ __ \\
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| | \ ___/| | \/\___ \| |\___ \ | | \ ___/| | \/
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|____| \___ >__| /____ >__/____ > |__| \___ >__|
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\/ \/ \/ \/
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''')
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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())
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