class ZenHub(ZCmdBase):
"""
Listen for changes to objects in the Zeo database and update the
collectors' configuration.
The remote collectors connect the ZenHub and request configuration
information and stay connected. When changes are detected in the
Zeo database, configuration updates are sent out to collectors
asynchronously. In this way, changes made in the web GUI can
affect collection immediately, instead of waiting for a
configuration cycle.
Each collector uses a different, pluggable service within ZenHub
to translate objects into configuration and data. ZenPacks can
add services for their collectors. Collectors communicate using
Twisted's Perspective Broker, which provides authenticated,
asynchronous, bidirectional method invocation.
ZenHub also provides an XmlRPC interface to some common services
to support collectors written in other languages.
ZenHub does very little work in its own process, but instead dispatches
the work to a pool of zenhubworkers, running zenhubworker.py. zenhub
manages these workers with 1 data structure:
- workers - a list of remote PB instances
TODO: document invalidation workers
"""
totalTime = 0.
totalEvents = 0
totalCallTime = 0.
mname = name = 'zenhub'
def __init__(self):
"""
Hook ourselves up to the Zeo database and wait for collectors
to connect.
"""
self.shutdown = False
self.counters = collections.Counter()
super(ZenHub, self).__init__()
load_config("hub.zcml", ZENHUB_MODULE)
notify(HubWillBeCreatedEvent(self))
if self.options.profiling:
self.profiler = ContinuousProfiler('zenhub', log=self.log)
self.profiler.start()
self.zem = self.dmd.ZenEventManager
# responsible for sending messages to the queues
load_config_override('twistedpublisher.zcml', QUEUEMESSAGING_MODULE)
notify(HubCreatedEvent(self))
self.sendEvent(eventClass=App_Start,
summary="%s started" % self.name,
severity=0)
# ZenHub Services (and XMLRPC)
self._service_manager = HubServiceManager(
modeling_pause_timeout=self.options.modeling_pause_timeout,
passwordfile=self.options.passwordfile,
pbport=self.options.pbport,
xmlrpcport=self.options.xmlrpcport,
)
# Invalidation Processing
self._invalidation_manager = InvalidationManager(
self.dmd,
self.log,
self.async_syncdb,
self.storage.poll_invalidations,
self.sendEvent,
poll_interval=self.options.invalidation_poll_interval,
)
# Setup Metric Reporting
self._metric_manager = MetricManager(
daemon_tags={
'zenoss_daemon': 'zenhub',
'zenoss_monitor': self.options.monitor,
'internal': True
})
self._metric_writer = self._metric_manager.metric_writer
self.rrdStats = self._metric_manager.get_rrd_stats(
self._getConf(), self.zem.sendEvent
)
# set up SIGUSR2 handling
try:
signal.signal(signal.SIGUSR2, self.sighandler_USR2)
except ValueError:
# If we get called multiple times, this will generate an exception:
# ValueError: signal only works in main thread
# Ignore it as we've already set up the signal handler.
pass
# ZEN-26671 Wait at least this duration in secs
# before signaling a worker process
self.SIGUSR_TIMEOUT = 5
@property
def services(self):
return self._service_manager.services
def main(self):
"""
Start the main event loop.
"""
if self.options.cycle:
reactor.callLater(0, self.heartbeat)
self.log.debug("Creating async MetricReporter")
self._metric_manager.start()
reactor.addSystemEventTrigger(
'before', 'shutdown', self._metric_manager.stop
)
# preserve legacy API
self.metricreporter = self._metric_manager.metricreporter
# Start ZenHub services
self._service_manager.start(self.dmd, reactor)
self._service_manager.onExecute(self.__workerItemCounter)
# Start Processing Invalidations
self.process_invalidations_task = task.LoopingCall(
self._invalidation_manager.process_invalidations
)
self.process_invalidations_task.start(
self.options.invalidation_poll_interval
)
reactor.run()
self.shutdown = True
getUtility(IEventPublisher).close()
if self.options.profiling:
self.profiler.stop()
def __workerItemCounter(self, job):
self.counters["workerItems"] += 1
def sighandler_USR2(self, signum, frame):
reactor.callLater(0, self.__dumpStats)
@inlineCallbacks
def __dumpStats(self):
self.log.info("\n%s\n", self._service_manager.getStatusReport())
yield self._service_manager.reportWorkerStatus()
def sighandler_USR1(self, signum, frame):
if self.options.profiling:
self.profiler.dump_stats()
super(ZenHub, self).sighandler_USR1(signum, frame)
def stop(self):
self.shutdown = True
def _getConf(self):
confProvider = IHubConfProvider(self)
return confProvider.getHubConf()
def getService(self, service, monitor):
return self._service_manager.services.getService(service, monitor)
# Legacy API
def getRRDStats(self):
return self._metric_manager.get_rrd_stats(
self._getConf(), self.zem.sendEvent
)
# Legacy API
@inlineCallbacks
def processQueue(self):
"""
Periodically process database changes
@return: None
"""
yield self._invalidation_manager.process_invalidations()
# Legacy API
def _initialize_invalidation_filters(self):
self._invalidation_filters = self._invalidation_manager\
.initialize_invalidation_filters()
def sendEvent(self, **kw):
"""
Useful method for posting events to the EventManager.
@type kw: keywords (dict)
@param kw: the values for an event: device, summary, etc.
@return: None
"""
if 'device' not in kw:
kw['device'] = self.options.monitor
if 'component' not in kw:
kw['component'] = self.name
try:
self.zem.sendEvent(Event(**kw))
except Exception:
self.log.exception("Unable to send an event")
def heartbeat(self):
"""
Since we don't do anything on a regular basis, just
push heartbeats regularly.
@return: None
"""
seconds = 30
evt = EventHeartbeat(
self.options.monitor, self.name, self.options.heartbeatTimeout
)
self.zem.sendEvent(evt)
self.niceDoggie(seconds)
reactor.callLater(seconds, self.heartbeat)
r = self.rrdStats
totalTime = sum(
s.callTime for s in self._service_manager.services.values()
)
r.counter(
'totalTime', int(self._invalidation_manager.totalTime * 1000)
)
r.counter('totalEvents', self._invalidation_manager.totalEvents)
r.gauge('services', len(self._service_manager.services))
r.counter('totalCallTime', totalTime)
r.gauge('workListLength', len(self._service_manager.worklist))
for name, value in self.counters.items():
r.counter(name, value)
try:
hbcheck = IHubHeartBeatCheck(self)
hbcheck.check()
except Exception:
self.log.exception("Error processing heartbeat hook")
def buildOptions(self):
"""
Adds our command line options to ZCmdBase command line options.
"""
ZCmdBase.buildOptions(self)
self.parser.add_option(
'--xmlrpcport', '-x', dest='xmlrpcport',
type='int', default=XML_RPC_PORT,
help='Port to use for XML-based Remote Procedure Calls (RPC)')
self.parser.add_option(
'--pbport', dest='pbport',
type='int', default=PB_PORT,
help="Port to use for Twisted's pb service")
self.parser.add_option(
'--passwd', dest='passwordfile',
type='string', default=zenPath('etc', 'hubpasswd'),
help='File where passwords are stored')
self.parser.add_option(
'--monitor', dest='monitor',
default='localhost',
help='Name of the distributed monitor this hub runs on')
self.parser.add_option(
'--workers-reserved-for-events', dest='workersReservedForEvents',
type='int', default=1,
help="Number of worker instances to reserve for handling events")
self.parser.add_option(
'--invalidation-poll-interval',
type='int', default=30,
help="Interval at which to poll invalidations (default: %default)")
self.parser.add_option(
'--profiling', dest='profiling',
action='store_true', default=False,
help="Run with profiling on")
self.parser.add_option(
'--modeling-pause-timeout',
type='int', default=3600,
help='Maximum number of seconds to pause modeling during ZenPack'
' install/upgrade/removal (default: %default)')
notify(ParserReadyForOptionsEvent(self.parser))
class ZenHubWorker(ZCmdBase, pb.Referenceable):
"""Execute ZenHub requests."""
mname = name = "zenhubworker"
def __init__(self, reactor):
"""Initialize a ZenHubWorker instance."""
ZCmdBase.__init__(self)
self.__reactor = reactor
if self.options.profiling:
self.profiler = ContinuousProfiler('ZenHubWorker', log=self.log)
self.profiler.start()
reactor.addSystemEventTrigger(
'before', 'shutdown', self.profiler.stop,
)
self.instanceId = self.options.workerid
self.current = IDLE
self.currentStart = 0
self.numCalls = Metrology.meter("zenhub.workerCalls")
self.zem = self.dmd.ZenEventManager
loadPlugins(self.dmd)
serviceFactory = ServiceReferenceFactory(self)
self.__registry = HubServiceRegistry(self.dmd, serviceFactory)
# Configure/initialize the ZenHub client
creds = UsernamePassword(
self.options.hubusername, self.options.hubpassword,
)
endpointDescriptor = "tcp:{host}:{port}".format(
host=self.options.hubhost, port=self.options.hubport,
)
endpoint = clientFromString(reactor, endpointDescriptor)
self.__client = ZenHubClient(reactor, endpoint, creds, self, 10.0)
# Setup Metric Reporting
self.log.debug("Creating async MetricReporter")
self._metric_manager = MetricManager(
daemon_tags={
'zenoss_daemon': 'zenhub_worker_%s' % self.options.workerid,
'zenoss_monitor': self.options.monitor,
'internal': True,
},
)
def start(self):
"""Start zenhubworker processing."""
self.log.debug("establishing SIGUSR1 signal handler")
signal.signal(signal.SIGUSR1, self.sighandler_USR1)
self.log.debug("establishing SIGUSR2 signal handler")
signal.signal(signal.SIGUSR2, self.sighandler_USR2)
self.__client.start()
self.__reactor.addSystemEventTrigger(
'before', 'shutdown', self.__client.stop,
)
self._metric_manager.start()
self.__reactor.addSystemEventTrigger(
'before', 'shutdown', self._metric_manager.stop,
)
self.__reactor.addSystemEventTrigger(
"after", "shutdown", self.reportStats,
)
def audit(self, action):
"""Override default audit behavior.
Zenhubworker restarts frequently, so no need to audit.
"""
pass
def setupLogging(self):
"""Configure logging for zenhubworker.
Override setupLogging to add instance id/count information to
all log messages.
"""
super(ZenHubWorker, self).setupLogging()
instanceInfo = "(%s)" % (self.options.workerid,)
template = (
"%%(asctime)s %%(levelname)s %%(name)s: %s %%(message)s"
) % instanceInfo
rootLog = logging.getLogger()
formatter = logging.Formatter(template)
for handler in rootLog.handlers:
handler.setFormatter(formatter)
def sighandler_USR1(self, signum, frame):
"""Handle USR1 signals.
When a USR1 signals is caught and profiling is enabled, the
zenhubworker's profiler will dump its current statistics before
calling the base class's sighandler_USR1 method.
"""
try:
if self.options.profiling:
self.profiler.dump_stats()
super(ZenHubWorker, self).sighandler_USR1(signum, frame)
except Exception:
pass
def sighandler_USR2(self, *args):
"""Handle USR2 signals."""
try:
self.reportStats()
except Exception:
pass
def _work_started(self, startTime):
self.currentStart = startTime
self.numCalls.mark()
def _work_finished(self, duration, method):
self.log.debug("Time in %s: %.2f", method, duration)
self.current = IDLE
self.currentStart = 0
if self.numCalls.count >= self.options.call_limit:
self.log.info(
"Call limit of %s reached, "
"proceeding to shutdown (and restart)",
self.options.call_limit,
)
self.__reactor.callLater(0, self._shutdown)
def reportStats(self):
"""Write zenhubworker's current statistics to the log."""
now = time.time()
if self.current != IDLE:
self.log.info(
"Currently performing %s, elapsed %.2f s",
self.current, now - self.currentStart,
)
else:
self.log.info("Currently IDLE")
if self.__registry:
loglines = ["Running statistics:"]
sorted_data = sorted(
self.__registry.iteritems(),
key=lambda kvp: (kvp[0][1], kvp[0][0].rpartition('.')[-1]),
)
for svc, svcob in sorted_data:
svc = "%s/%s" % (svc[1], svc[0].rpartition('.')[-1])
for method, stats in sorted(svcob.callStats.items()):
loglines.append(
" - %-48s %-32s %8d %12.2f %8.2f %s" % (
svc, method,
stats.numoccurrences,
stats.totaltime,
stats.totaltime / stats.numoccurrences
if stats.numoccurrences else 0.0,
isoDateTime(stats.lasttime),
),
)
self.log.info('\n'.join(loglines))
else:
self.log.info("no service activity statistics")
def remote_reportStatus(self):
"""Write zenhubworker's current statistics to the log.
This method is the RPC interface to reportStats.
"""
try:
self.reportStats()
except Exception:
self.log.exception("Failed to report status")
def remote_getService(self, name, monitor):
"""Return a reference to the named service.
@param name {str} Name of the service to load
@param monitor {str} Name of the collection monitor
"""
try:
return self.__registry.getService(name, monitor)
except RemoteBadMonitor:
# Catch and rethrow this Exception derived exception.
raise
except UnknownServiceError:
self.log.error("Service '%s' not found", name)
raise
except Exception as ex:
self.log.exception("Failed to get service '%s'", name)
raise pb.Error(str(ex))
def _shutdown(self):
self.log.info("Shutting down")
try:
self.__reactor.stop()
except error.ReactorNotRunning:
pass
def buildOptions(self):
"""Add optparse options to the options parser."""
ZCmdBase.buildOptions(self)
self.parser.add_option(
'--hubhost', dest='hubhost', default='localhost',
help="Host to use for connecting to ZenHub",
)
self.parser.add_option(
'--hubport', dest='hubport', type='int', default=PB_PORT,
help="Port to use for connecting to ZenHub",
)
self.parser.add_option(
'--hubusername', dest='hubusername', default='admin',
help="Login name to use when connecting to ZenHub",
)
self.parser.add_option(
'--hubpassword', dest='hubpassword', default='zenoss',
help="password to use when connecting to ZenHub",
)
self.parser.add_option(
'--call-limit', dest='call_limit', type='int', default=200,
help="Maximum number of remote calls before restarting worker",
)
self.parser.add_option(
'--profiling', dest='profiling',
action='store_true', default=False, help="Run with profiling on",
)
self.parser.add_option(
'--monitor', dest='monitor', default='localhost',
help='Name of the performance monitor this hub runs on',
)
self.parser.add_option(
'--workerid', dest='workerid', type='int', default=0,
help=SUPPRESS_HELP,
)
class ZenHubWorker(ZCmdBase, pb.Referenceable):
"""Execute ZenHub requests."""
mname = name = "zenhubworker"
def __init__(self, reactor):
"""Initialize a ZenHubWorker instance."""
ZCmdBase.__init__(self)
self.__reactor = reactor
if self.options.profiling:
self.profiler = ContinuousProfiler('ZenHubWorker', log=self.log)
self.profiler.start()
reactor.addSystemEventTrigger(
'before',
'shutdown',
self.profiler.stop,
)
self.current = IDLE
self.currentStart = 0
self.numCalls = Metrology.meter("zenhub.workerCalls")
self.zem = self.dmd.ZenEventManager
loadPlugins(self.dmd)
self.__registry = ServiceRegistry()
loader = ServiceLoader()
factory = ServiceReferenceFactory(self)
self.__manager = ServiceManager(self.__registry, loader, factory)
# Configure/initialize the ZenHub client
creds = UsernamePassword(
self.options.hubusername,
self.options.hubpassword,
)
endpointDescriptor = "tcp:{host}:{port}".format(
host=self.options.hubhost,
port=self.options.hubport,
)
endpoint = clientFromString(reactor, endpointDescriptor)
self.__client = ZenHubClient(
reactor,
endpoint,
creds,
self,
10.0,
self.worklistId,
)
# Setup Metric Reporting
self.log.debug("Creating async MetricReporter")
self._metric_manager = MetricManager(daemon_tags={
'zenoss_daemon':
'zenhub_worker_%s' % self.instanceId,
'zenoss_monitor':
self.options.monitor,
'internal':
True,
}, )
# Make the metric manager available via zope.component.getUtility
getGlobalSiteManager().registerUtility(
self._metric_manager,
IMetricManager,
name='zenhub_worker_metricmanager',
)
def start(self):
"""Start zenhubworker processing."""
self.log.debug("establishing SIGUSR1 signal handler")
signal.signal(signal.SIGUSR1, self.sighandler_USR1)
self.log.debug("establishing SIGUSR2 signal handler")
signal.signal(signal.SIGUSR2, self.sighandler_USR2)
self.__client.start()
self.__reactor.addSystemEventTrigger(
'before',
'shutdown',
self.__client.stop,
)
self._metric_manager.start()
self.__reactor.addSystemEventTrigger(
'before',
'shutdown',
self._metric_manager.stop,
)
self.__reactor.addSystemEventTrigger(
"after",
"shutdown",
self.reportStats,
)
def audit(self, action):
"""Override default audit behavior.
Zenhubworker restarts frequently, so no need to audit.
"""
pass
def parseOptions(self):
"""Parse options for zenhubworker.
Override parseOptions to capture the worklistId argument.
"""
super(ZenHubWorker, self).parseOptions()
if len(self.args) == 0:
raise OptParseError("ZenHub worklist name not specified")
self.worklistId = self.args[0]
self.instanceId = "%s_%s" % (self.worklistId, self.options.workerid)
def setupLogging(self):
"""Configure logging for zenhubworker.
Override setupLogging to add instance id/count information to
all log messages.
"""
super(ZenHubWorker, self).setupLogging()
template = ("%%(asctime)s %%(levelname)s %%(name)s: (%s) %%(message)s"
) % self.instanceId
rootLog = logging.getLogger()
formatter = logging.Formatter(template)
for handler in rootLog.handlers:
handler.setFormatter(formatter)
def sighandler_USR1(self, signum, frame):
"""Handle USR1 signals.
When a USR1 signals is caught and profiling is enabled, the
zenhubworker's profiler will dump its current statistics before
calling the base class's sighandler_USR1 method.
"""
try:
if self.options.profiling:
self.profiler.dump_stats()
super(ZenHubWorker, self).sighandler_USR1(signum, frame)
except Exception:
pass
def sighandler_USR2(self, *args):
"""Handle USR2 signals."""
try:
self.reportStats()
except Exception:
pass
def _work_started(self, startTime):
self.currentStart = startTime
self.numCalls.mark()
def _work_finished(self, duration, method):
self.log.debug("Time in %s: %.2f", method, duration)
self.current = IDLE
self.currentStart = 0
if self.numCalls.count >= self.options.call_limit:
self.log.info(
"Call limit of %s reached, "
"proceeding to shutdown (and restart)",
self.options.call_limit,
)
self.__reactor.callLater(0, self._shutdown)
def reportStats(self):
"""Write zenhubworker's current statistics to the log."""
now = time.time()
if self.current != IDLE:
self.log.info(
"Currently performing %s, elapsed %.2f s",
self.current,
now - self.currentStart,
)
else:
self.log.info("Currently IDLE")
if self.__registry:
loglines = ["Running statistics:"]
sorted_data = sorted(
self.__registry.iteritems(),
key=lambda kv: kv[0].rpartition('.')[-1],
)
loglines.append(" %-50s %-32s %8s %12s %8s %s" % (
"Service",
"Method",
"Count",
"Total",
"Average",
"Last Run",
))
for svc, svcob in sorted_data:
svc = "%s" % svc.rpartition('.')[-1]
for method, stats in sorted(svcob.callStats.items()):
loglines.append(
" - %-48s %-32s %8d %12.2f %8.2f %s" % (
svc,
method,
stats.numoccurrences,
stats.totaltime,
stats.totaltime / stats.numoccurrences
if stats.numoccurrences else 0.0,
isoDateTime(stats.lasttime),
), )
self.log.info('\n'.join(loglines))
else:
self.log.info("no service activity statistics")
def remote_reportStatus(self):
"""Write zenhubworker's current statistics to the log.
This method is the RPC interface to reportStats.
"""
try:
self.reportStats()
except Exception:
self.log.exception("Failed to report status")
def remote_getService(self, name, monitor):
"""Return a reference to the named service.
@param name {str} Name of the service to load
@param monitor {str} Name of the collection monitor
"""
try:
return self.__manager.getService(name, monitor)
except RemoteBadMonitor:
# Catch and rethrow this Exception derived exception.
raise
except UnknownServiceError:
self.log.error("Service '%s' not found", name)
raise
except Exception as ex:
self.log.exception("Failed to get service '%s'", name)
raise pb.Error(str(ex))
def remote_ping(self):
"""Return "pong".
Used by ZenHub to determine whether zenhubworker is still active.
"""
return "pong"
def _shutdown(self):
self.log.info("Shutting down")
try:
self.__reactor.stop()
except error.ReactorNotRunning:
pass
def buildOptions(self):
"""Add optparse options to the options parser."""
ZCmdBase.buildOptions(self)
self.parser.add_option(
'--hubhost',
dest='hubhost',
default='localhost',
help="Host to use for connecting to ZenHub",
)
self.parser.add_option(
'--hubport',
dest='hubport',
type='int',
default=PB_PORT,
help="Port to use for connecting to ZenHub",
)
self.parser.add_option(
'--hubusername',
dest='hubusername',
default='admin',
help="Login name to use when connecting to ZenHub",
)
self.parser.add_option(
'--hubpassword',
dest='hubpassword',
default='zenoss',
help="password to use when connecting to ZenHub",
)
self.parser.add_option(
'--call-limit',
dest='call_limit',
type='int',
default=200,
help="Maximum number of remote calls before restarting worker",
)
self.parser.add_option(
'--profiling',
dest='profiling',
action='store_true',
default=False,
help="Run with profiling on",
)
self.parser.add_option(
'--monitor',
dest='monitor',
default='localhost',
help='Name of the performance monitor this hub runs on',
)
self.parser.add_option(
'--workerid',
dest='workerid',
type='int',
default=0,
help=SUPPRESS_HELP,
)
class ZenHub(ZCmdBase):
"""A server managing access to the Model and Event databases.
Listen for changes to objects in the Zeo database and update the
collectors' configuration.
The remote collectors connect the ZenHub and request configuration
information and stay connected. When changes are detected in the
Zeo database, configuration updates are sent out to collectors
asynchronously. In this way, changes made in the web GUI can
affect collection immediately, instead of waiting for a
configuration cycle.
Each collector uses a different, pluggable service within ZenHub
to translate objects into configuration and data. ZenPacks can
add services for their collectors. Collectors communicate using
Twisted's Perspective Broker, which provides authenticated,
asynchronous, bidirectional method invocation.
ZenHub also provides an XmlRPC interface to some common services
to support collectors written in other languages.
ZenHub does very little work in its own process, but instead dispatches
the work to a pool of zenhubworkers, running zenhubworker.py. zenhub
manages these workers with 1 data structure:
- workers - a list of remote PB instances
TODO: document invalidation workers
"""
totalTime = 0.
totalEvents = 0
totalCallTime = 0.
mname = name = 'zenhub'
def __init__(self):
self.shutdown = False
super(ZenHub, self).__init__()
load_config("hub.zcml", ZENHUB_MODULE)
notify(HubWillBeCreatedEvent(self))
if self.options.profiling:
self.profiler = ContinuousProfiler('zenhub', log=self.log)
self.profiler.start()
self.zem = self.dmd.ZenEventManager
# responsible for sending messages to the queues
load_config_override('twistedpublisher.zcml', QUEUEMESSAGING_MODULE)
notify(HubCreatedEvent(self))
self.sendEvent(eventClass=App_Start,
summary="%s started" % self.name,
severity=0)
# Initialize ZenHub's RPC servers
self._monitor = StatsMonitor()
self._status_reporter = ZenHubStatusReporter(self._monitor)
self._pools = make_pools()
self._service_manager = make_service_manager(self._pools)
authenticators = getCredentialCheckers(self.options.passwordfile)
self._server_factory = make_server_factory(
self._pools,
self._service_manager,
authenticators,
)
self._xmlrpc_manager = XmlRpcManager(self.dmd, authenticators[0])
register_legacy_worklist_metrics()
# Invalidation Processing
self._invalidation_manager = InvalidationManager(
self.dmd,
self.log,
self.async_syncdb,
self.storage.poll_invalidations,
self.sendEvent,
poll_interval=self.options.invalidation_poll_interval,
)
# Setup Metric Reporting
self._metric_manager = MetricManager(
daemon_tags={
'zenoss_daemon': 'zenhub',
'zenoss_monitor': self.options.monitor,
'internal': True,
})
provideUtility(self._metric_manager)
self._metric_writer = self._metric_manager.metric_writer
self.rrdStats = self._metric_manager.get_rrd_stats(
self._getConf(),
self.zem.sendEvent,
)
# set up SIGUSR2 handling
try:
signal.signal(signal.SIGUSR2, self.sighandler_USR2)
except ValueError as ex:
log.warn("Exception registering USR2 signal handler: %s", ex)
# If we get called multiple times, this will generate an exception:
# ValueError: signal only works in main thread
# Ignore it as we've already set up the signal handler.
pass
# ZEN-26671 Wait at least this duration in secs
# before signaling a worker process
self.SIGUSR_TIMEOUT = 5
def main(self):
"""Start the main event loop."""
if self.options.cycle:
reactor.callLater(0, self.heartbeat)
self.log.debug("Creating async MetricReporter")
self._metric_manager.start()
reactor.addSystemEventTrigger(
'before',
'shutdown',
self._metric_manager.stop,
)
# preserve legacy API
self.metricreporter = self._metric_manager.metricreporter
# Start ZenHub services server
start_server(reactor, self._server_factory)
# Start XMLRPC server
self._xmlrpc_manager.start(reactor)
# Start Processing Invalidations
self.process_invalidations_task = task.LoopingCall(
self._invalidation_manager.process_invalidations, )
self.process_invalidations_task.start(
self.options.invalidation_poll_interval, )
reactor.run()
self.shutdown = True
getUtility(IEventPublisher).close()
if self.options.profiling:
self.profiler.stop()
@property
def counters(self):
return self._monitor.counters
def sighandler_USR2(self, signum, frame):
try:
self.log.info("\n%s\n", self._status_reporter.getReport())
notify(ReportWorkerStatus())
except Exception:
self.log.exception("Failed to produce report")
def sighandler_USR1(self, signum, frame):
if self.options.profiling:
self.profiler.dump_stats()
super(ZenHub, self).sighandler_USR1(signum, frame)
def stop(self):
self.shutdown = True
def _getConf(self):
confProvider = IHubConfProvider(self)
return confProvider.getHubConf()
def getService(self, service, monitor):
return self._service_manager.getService(service, monitor)
# Legacy API
def getRRDStats(self):
return self._metric_manager.get_rrd_stats(
self._getConf(),
self.zem.sendEvent,
)
# Legacy API
@inlineCallbacks
def processQueue(self):
"""Periodically process database changes."""
yield self._invalidation_manager.process_invalidations()
# Legacy API
def _initialize_invalidation_filters(self):
self._invalidation_filters = self._invalidation_manager\
.initialize_invalidation_filters()
def sendEvent(self, **kw):
"""Post events to the EventManager.
@type kw: keywords (dict)
@param kw: the values for an event: device, summary, etc.
@return: None
"""
if 'device' not in kw:
kw['device'] = self.options.monitor
if 'component' not in kw:
kw['component'] = self.name
try:
self.zem.sendEvent(Event(**kw))
except Exception:
self.log.exception("Unable to send an event")
def heartbeat(self):
"""Send Heartbeat events.
Also used to update legacy metrics/statistics data.
"""
seconds = 30
evt = EventHeartbeat(
self.options.monitor,
self.name,
self.options.heartbeatTimeout,
)
self.zem.sendEvent(evt)
self.niceDoggie(seconds)
reactor.callLater(seconds, self.heartbeat)
r = self.rrdStats
r.counter(
'totalTime',
int(self._invalidation_manager.totalTime * 1000),
)
r.counter('totalEvents', self._invalidation_manager.totalEvents)
self._monitor.update_rrd_stats(r, self._service_manager)
try:
hbcheck = IHubHeartBeatCheck(self)
hbcheck.check()
except Exception:
self.log.exception("Error processing heartbeat hook")
def buildOptions(self):
"""Add ZenHub command-line options."""
ZCmdBase.buildOptions(self)
self.parser.add_option(
'--xmlrpcport',
'-x',
dest='xmlrpcport',
type='int',
default=server_config.defaults.xmlrpcport,
help='Port to use for XML-based Remote Procedure Calls (RPC)')
self.parser.add_option('--pbport',
dest='pbport',
type='int',
default=server_config.defaults.pbport,
help="Port to use for Twisted's pb service")
self.parser.add_option('--passwd',
dest='passwordfile',
type='string',
default=zenPath('etc', 'hubpasswd'),
help='File where passwords are stored')
self.parser.add_option(
'--monitor',
dest='monitor',
default='localhost',
help='Name of the distributed monitor this hub runs on')
self.parser.add_option(
'--workers-reserved-for-events',
dest='workersReservedForEvents',
type='int',
default=1,
help="Number of worker instances to reserve for handling events")
self.parser.add_option(
'--invalidation-poll-interval',
type='int',
default=30,
help="Interval at which to poll invalidations (default: %default)")
self.parser.add_option('--profiling',
dest='profiling',
action='store_true',
default=False,
help="Run with profiling on")
self.parser.add_option(
'--modeling-pause-timeout',
type='int',
default=server_config.defaults.modeling_pause_timeout,
help='Maximum number of seconds to pause modeling during ZenPack'
' install/upgrade/removal (default: %default)')
notify(ParserReadyForOptionsEvent(self.parser))
def parseOptions(self):
# Override parseOptions to initialize and install the
# ServiceManager configuration utility.
super(ZenHub, self).parseOptions()
server_config.modeling_pause_timeout = \
int(self.options.modeling_pause_timeout)
server_config.xmlrpcport = int(self.options.xmlrpcport)
server_config.pbport = int(self.options.pbport)
config_util = server_config.ModuleObjectConfig(server_config)
provideUtility(config_util, IHubServerConfig)