334 lines
11 KiB
Python
334 lines
11 KiB
Python
#!/usr/bin/env python
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# Core modules
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import glob
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import logging
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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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# Custom modules
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import checks.collector
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import checks.services_checks as status_checks
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import jmxfetch
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import monasca_agent.common.check_status
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import monasca_agent.common.config as cfg
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import monasca_agent.common.daemon
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import monasca_agent.common.emitter
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import monasca_agent.common.util as util
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# set up logging before importing any other components
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util.initialize_logging('collector')
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os.umask(0o22)
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# Check we're not using an old version of Python. We need 2.4 above because
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# some modules (like subprocess) were only introduced in 2.4.
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if int(sys.version_info[1]) <= 3:
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sys.stderr.write("Monasca Agent requires python 2.4 or later.\n")
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sys.exit(2)
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# Constants
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PID_NAME = "monasca-agent"
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RESTART_INTERVAL = 4 * 24 * 60 * 60 # Defaults to 4 days
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START_COMMANDS = ['start', 'restart', 'foreground']
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# Globals
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log = logging.getLogger('collector')
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# todo the collector has daemon code but is always run in foreground mode
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# from the supervisor, is there a reason for the daemon code then?
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class CollectorDaemon(monasca_agent.common.daemon.Daemon):
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"""The agent class is a daemon that runs the collector in a background process.
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"""
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def __init__(self, pidfile, autorestart, start_event=True):
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monasca_agent.common.daemon.Daemon.__init__(self, pidfile, autorestart=autorestart)
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self.run_forever = True
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self.collector = None
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self.start_event = start_event
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def _handle_sigterm(self, signum, frame):
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log.debug("Caught sigterm. Stopping run loop.")
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self.run_forever = False
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if jmxfetch.JMXFetch.is_running():
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jmxfetch.JMXFetch.stop()
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if self.collector:
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self.collector.stop()
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log.debug("Collector is stopped.")
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def _handle_sigusr1(self, signum, frame):
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self._handle_sigterm(signum, frame)
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self._do_restart()
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def info(self, verbose=None):
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logging.getLogger().setLevel(logging.ERROR)
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return monasca_agent.common.check_status.CollectorStatus.print_latest_status(verbose=verbose)
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def run(self, config):
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"""Main loop of the collector.
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"""
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# Gracefully exit on sigterm.
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signal.signal(signal.SIGTERM, self._handle_sigterm)
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# A SIGUSR1 signals an exit with an autorestart
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signal.signal(signal.SIGUSR1, self._handle_sigusr1)
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# Handle Keyboard Interrupt
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signal.signal(signal.SIGINT, self._handle_sigterm)
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# Save the agent start-up stats.
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monasca_agent.common.check_status.CollectorStatus().persist()
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# Load the checks_d checks
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checksd = util.load_check_directory()
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self.collector = checks.collector.Collector(config, monasca_agent.common.emitter.http_emitter, checksd)
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check_frequency = int(config['check_freq'])
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# Initialize the auto-restarter
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self.restart_interval = int(config.get('restart_interval', RESTART_INTERVAL))
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self.agent_start = time.time()
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# Run the main loop.
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while self.run_forever:
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# enable profiler if needed
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profiled = False
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if config.get('profile', False) and config.get('profile').lower() == 'yes':
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try:
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import cProfile
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profiler = cProfile.Profile()
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profiled = True
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profiler.enable()
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log.debug("Agent profiling is enabled")
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except Exception:
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log.warn("Cannot enable profiler")
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# Do the work.
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self.collector.run()
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# disable profiler and printout stats to stdout
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if config.get('profile', False) and config.get('profile').lower() == 'yes' and profiled:
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try:
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profiler.disable()
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import cStringIO
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import pstats
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s = cStringIO.StringIO()
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ps = pstats.Stats(profiler, stream=s).sort_stats("cumulative")
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ps.print_stats()
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log.debug(s.getvalue())
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except Exception:
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log.warn("Cannot disable profiler")
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# Check if we should restart.
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if self.autorestart and self._should_restart():
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self._do_restart()
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# Only plan for the next loop if we will continue,
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# otherwise just exit quickly.
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if self.run_forever:
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time.sleep(check_frequency)
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# Now clean-up.
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try:
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monasca_agent.common.check_status.CollectorStatus.remove_latest_status()
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except Exception:
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pass
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# Explicitly kill the process, because it might be running
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# as a daemon.
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log.info("Exiting. Bye bye.")
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sys.exit(0)
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def _should_restart(self):
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if time.time() - self.agent_start > self.restart_interval:
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return True
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return False
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def _do_restart(self):
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log.info("Running an auto-restart.")
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if self.collector:
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self.collector.stop()
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sys.exit(monasca_agent.common.daemon.AgentSupervisor.RESTART_EXIT_STATUS)
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def main():
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options, args = util.get_parsed_args()
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config = cfg.Config()
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collector_config = config.get_config(['Main', 'Api', 'Logging'])
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# todo autorestart isn't used remove
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autorestart = collector_config.get('autorestart', False)
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COMMANDS = [
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'start',
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'stop',
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'restart',
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'foreground',
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'status',
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'info',
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'check',
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'check_all',
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'configcheck',
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'jmx',
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]
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if len(args) < 1:
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sys.stderr.write("Usage: %s %s\n" % (sys.argv[0], "|".join(COMMANDS)))
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return 2
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command = args[0]
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if command not in COMMANDS:
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sys.stderr.write("Unknown command: %s\n" % command)
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return 3
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pid_file = util.PidFile('monasca-agent')
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if options.clean:
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pid_file.clean()
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agent = CollectorDaemon(pid_file.get_path(), autorestart)
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if command in START_COMMANDS:
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log.info('Agent version %s' % config.get_version())
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if 'start' == command:
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log.info('Start daemon')
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agent.start()
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elif 'stop' == command:
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log.info('Stop daemon')
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agent.stop()
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elif 'restart' == command:
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log.info('Restart daemon')
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agent.restart()
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elif 'status' == command:
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agent.status()
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elif 'info' == command:
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return agent.info(verbose=options.verbose)
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elif 'foreground' == command:
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logging.info('Running in foreground')
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if autorestart:
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# Set-up the supervisor callbacks and fork it.
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logging.info('Running Agent with auto-restart ON')
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def child_func():
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agent.run()
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def parent_func():
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agent.start_event = False
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monasca_agent.common.daemon.AgentSupervisor.start(parent_func, child_func)
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else:
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# Run in the standard foreground.
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agent.run(collector_config)
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elif 'check' == command:
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check_name = args[1]
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checks = util.load_check_directory()
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for check in checks['initialized_checks']:
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if check.name == check_name:
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run_check(check)
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elif 'check_all' == command:
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print("Loading check directory...")
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checks = util.load_check_directory()
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print("...directory loaded.\n")
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for check in checks['initialized_checks']:
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run_check(check)
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elif 'configcheck' == command or 'configtest' == command:
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all_valid = True
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paths = util.Paths()
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for conf_path in glob.glob(os.path.join(paths.get_confd_path(), "*.yaml")):
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basename = os.path.basename(conf_path)
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try:
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config.check_yaml(conf_path)
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except Exception as e:
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all_valid = False
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print("%s contains errors:\n %s" % (basename, e))
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else:
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print("%s is valid" % basename)
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if all_valid:
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print("All yaml files passed. You can now run the Monitoring agent.")
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return 0
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else:
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print("Fix the invalid yaml files above in order to start the Monitoring agent. "
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"A useful external tool for yaml parsing can be found at "
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"http://yaml-online-parser.appspot.com/")
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return 1
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elif 'jmx' == command:
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if len(args) < 2 or args[1] not in jmxfetch.JMX_LIST_COMMANDS.keys():
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print("#" * 80)
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print("JMX tool to be used to help configure your JMX checks.")
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print("See http://docs.datadoghq.com/integrations/java/ for more information")
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print("#" * 80)
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print("\n")
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print("You have to specify one of the following commands:")
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for command, desc in jmxfetch.JMX_LIST_COMMANDS.iteritems():
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print(" - %s [OPTIONAL: LIST OF CHECKS]: %s" % (command, desc))
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print("Example: sudo /etc/init.d/monasca-agent jmx list_matching_attributes tomcat jmx solr")
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print("\n")
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else:
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jmx_command = args[1]
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checks_list = args[2:]
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paths = util.Paths()
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confd_path = paths.get_confd_path()
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# Start JMXFetch if needed
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should_run = jmxfetch.JMXFetch.init(confd_path,
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config,
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15,
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jmx_command,
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checks_list,
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reporter="console")
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if not should_run:
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print("Couldn't find any valid JMX configuration in your conf.d directory: %s" % confd_path)
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print("Have you enabled any JMX checks ?")
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return 0
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def run_check(check):
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is_multi_threaded = False
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if isinstance(check, status_checks.ServicesCheck):
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is_multi_threaded = True
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print("#" * 80)
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print("Check name: '{0}'\n".format(check.name))
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check.run()
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# Sleep for a second and then run a second check to capture rate metrics
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time.sleep(1)
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check.run()
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if is_multi_threaded:
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# Sleep for a second to allow async threads to finish
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time.sleep(1)
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check.stop_pool()
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print("Metrics: ")
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check.get_metrics(prettyprint=True)
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print("#" * 80 + "\n\n")
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if __name__ == '__main__':
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try:
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sys.exit(main())
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except Exception:
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# Try our best to log the error.
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try:
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log.exception("Uncaught error running the Agent")
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except Exception:
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pass
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raise
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