def __init__(self, preferences, taskSplitter,
configurationListener=DUMMY_LISTENER,
initializationCallback=None,
stoppingCallback=None):
"""
Constructs a new instance of the CollectorDaemon framework. Normally
only a singleton instance of a CollectorDaemon should exist within a
process, but this is not enforced.
@param preferences: the collector configuration
@type preferences: ICollectorPreferences
@param taskSplitter: the task splitter to use for this collector
@type taskSplitter: ITaskSplitter
@param initializationCallback: a callable that will be executed after
connection to the hub but before
retrieving configuration information
@type initializationCallback: any callable
@param stoppingCallback: a callable that will be executed first during
the stopping process. Exceptions will be
logged but otherwise ignored.
@type stoppingCallback: any callable
"""
# create the configuration first, so we have the collector name
# available before activating the rest of the Daemon class hierarchy.
if not ICollectorPreferences.providedBy(preferences):
raise TypeError("configuration must provide ICollectorPreferences")
else:
self._prefs = ObservableProxy(preferences)
self._prefs.attachAttributeObserver('configCycleInterval', self._rescheduleConfig)
if not ITaskSplitter.providedBy(taskSplitter):
raise TypeError("taskSplitter must provide ITaskSplitter")
else:
self._taskSplitter = taskSplitter
if not IConfigurationListener.providedBy(configurationListener):
raise TypeError(
"configurationListener must provide IConfigurationListener")
self._configListener = ConfigListenerNotifier()
self._configListener.addListener(configurationListener)
self._configListener.addListener(DeviceGuidListener(self))
self._initializationCallback = initializationCallback
self._stoppingCallback = stoppingCallback
# register the various interfaces we provide the rest of the system so
# that collector implementors can easily retrieve a reference back here
# if needed
zope.component.provideUtility(self, ICollector)
zope.component.provideUtility(self, IEventService)
zope.component.provideUtility(self, IDataService)
# setup daemon statistics
self._statService = StatisticsService()
self._statService.addStatistic("devices", "GAUGE")
self._statService.addStatistic("dataPoints", "DERIVE")
self._statService.addStatistic("runningTasks", "GAUGE")
self._statService.addStatistic("taskCount", "GAUGE")
self._statService.addStatistic("queuedTasks", "GAUGE")
self._statService.addStatistic("missedRuns", "GAUGE")
zope.component.provideUtility(self._statService, IStatisticsService)
# register the collector's own preferences object so it may be easily
# retrieved by factories, tasks, etc.
zope.component.provideUtility(self.preferences,
ICollectorPreferences,
self.preferences.collectorName)
super(CollectorDaemon, self).__init__(name=self.preferences.collectorName)
self._deviceGuids = {}
self._devices = set()
self._unresponsiveDevices = set()
self._rrd = None
self._metric_writer = None
self._derivative_tracker = None
self.reconfigureTimeout = None
# keep track of pending tasks if we're doing a single run, and not a
# continuous cycle
if not self.options.cycle:
self._completedTasks = 0
self._pendingTasks = []
frameworkFactory = zope.component.queryUtility(IFrameworkFactory, self._frameworkFactoryName)
self._configProxy = frameworkFactory.getConfigurationProxy()
self._scheduler = frameworkFactory.getScheduler()
self._scheduler.maxTasks = self.options.maxTasks
self._ConfigurationLoaderTask = frameworkFactory.getConfigurationLoaderTask()
# OLD - set the initialServices attribute so that the PBDaemon class
# will load all of the remote services we need.
self.initialServices = PBDaemon.initialServices +\
[self.preferences.configurationService]
# trap SIGUSR2 so that we can display detailed statistics
signal.signal(signal.SIGUSR2, self._signalHandler)
# let the configuration do any additional startup it might need
self.preferences.postStartup()
self.addedPostStartupTasks = False
class CollectorDaemon(RRDDaemon):
"""
The daemon class for the entire ZenCollector framework. This class bridges
the gap between the older daemon framework and ZenCollector. New collectors
no longer should extend this class to implement a new collector.
"""
zope.interface.implements(ICollector,
IDataService,
IEventService)
_frameworkFactoryName = ""
@property
def preferences(self):
"""
Preferences for this daemon
"""
return self._prefs
def __init__(self, preferences, taskSplitter,
configurationListener=DUMMY_LISTENER,
initializationCallback=None,
stoppingCallback=None):
"""
Constructs a new instance of the CollectorDaemon framework. Normally
only a singleton instance of a CollectorDaemon should exist within a
process, but this is not enforced.
@param preferences: the collector configuration
@type preferences: ICollectorPreferences
@param taskSplitter: the task splitter to use for this collector
@type taskSplitter: ITaskSplitter
@param initializationCallback: a callable that will be executed after
connection to the hub but before
retrieving configuration information
@type initializationCallback: any callable
@param stoppingCallback: a callable that will be executed first during
the stopping process. Exceptions will be
logged but otherwise ignored.
@type stoppingCallback: any callable
"""
# create the configuration first, so we have the collector name
# available before activating the rest of the Daemon class hierarchy.
if not ICollectorPreferences.providedBy(preferences):
raise TypeError("configuration must provide ICollectorPreferences")
else:
self._prefs = ObservableProxy(preferences)
self._prefs.attachAttributeObserver('configCycleInterval', self._rescheduleConfig)
if not ITaskSplitter.providedBy(taskSplitter):
raise TypeError("taskSplitter must provide ITaskSplitter")
else:
self._taskSplitter = taskSplitter
if not IConfigurationListener.providedBy(configurationListener):
raise TypeError(
"configurationListener must provide IConfigurationListener")
self._configListener = ConfigListenerNotifier()
self._configListener.addListener(configurationListener)
self._configListener.addListener(DeviceGuidListener(self))
self._initializationCallback = initializationCallback
self._stoppingCallback = stoppingCallback
# register the various interfaces we provide the rest of the system so
# that collector implementors can easily retrieve a reference back here
# if needed
zope.component.provideUtility(self, ICollector)
zope.component.provideUtility(self, IEventService)
zope.component.provideUtility(self, IDataService)
# setup daemon statistics
self._statService = StatisticsService()
self._statService.addStatistic("devices", "GAUGE")
self._statService.addStatistic("dataPoints", "DERIVE")
self._statService.addStatistic("runningTasks", "GAUGE")
self._statService.addStatistic("taskCount", "GAUGE")
self._statService.addStatistic("queuedTasks", "GAUGE")
self._statService.addStatistic("missedRuns", "GAUGE")
zope.component.provideUtility(self._statService, IStatisticsService)
# register the collector's own preferences object so it may be easily
# retrieved by factories, tasks, etc.
zope.component.provideUtility(self.preferences,
ICollectorPreferences,
self.preferences.collectorName)
super(CollectorDaemon, self).__init__(name=self.preferences.collectorName)
self._deviceGuids = {}
self._devices = set()
self._unresponsiveDevices = set()
self._rrd = None
self._metric_writer = None
self._derivative_tracker = None
self.reconfigureTimeout = None
# keep track of pending tasks if we're doing a single run, and not a
# continuous cycle
if not self.options.cycle:
self._completedTasks = 0
self._pendingTasks = []
frameworkFactory = zope.component.queryUtility(IFrameworkFactory, self._frameworkFactoryName)
self._configProxy = frameworkFactory.getConfigurationProxy()
self._scheduler = frameworkFactory.getScheduler()
self._scheduler.maxTasks = self.options.maxTasks
self._ConfigurationLoaderTask = frameworkFactory.getConfigurationLoaderTask()
# OLD - set the initialServices attribute so that the PBDaemon class
# will load all of the remote services we need.
self.initialServices = PBDaemon.initialServices +\
[self.preferences.configurationService]
# trap SIGUSR2 so that we can display detailed statistics
signal.signal(signal.SIGUSR2, self._signalHandler)
# let the configuration do any additional startup it might need
self.preferences.postStartup()
self.addedPostStartupTasks = False
def buildOptions(self):
"""
Method called by CmdBase.__init__ to build all of the possible
command-line options for this collector daemon.
"""
super(CollectorDaemon, self).buildOptions()
maxTasks = getattr(self.preferences, 'maxTasks', None)
defaultMax = maxTasks if maxTasks else 500
self.parser.add_option('--maxparallel',
dest='maxTasks',
type='int',
default=defaultMax,
help='Max number of tasks to run at once, default %default')
self.parser.add_option('--logTaskStats',
dest='logTaskStats',
type='int',
default=0,
help='How often to logs statistics of current tasks, value in seconds; very verbose')
self.parser.add_option('--writeStatistics',
dest='writeStatistics',
type='int',
default=60,
help='How often to write internal statistics value in seconds')
frameworkFactory = zope.component.queryUtility(IFrameworkFactory, self._frameworkFactoryName)
if hasattr(frameworkFactory, 'getFrameworkBuildOptions'):
# During upgrades we'll be missing this option
self._frameworkBuildOptions = frameworkFactory.getFrameworkBuildOptions()
if self._frameworkBuildOptions:
self._frameworkBuildOptions(self.parser)
# give the collector configuration a chance to add options, too
self.preferences.buildOptions(self.parser)
def parseOptions(self):
super(CollectorDaemon, self).parseOptions()
self.preferences.options = self.options
def connected(self):
"""
Method called by PBDaemon after a connection to ZenHub is established.
"""
return self._startup()
def _getInitializationCallback(self):
def doNothing():
pass
if self._initializationCallback is not None:
return self._initializationCallback
else:
return doNothing
def connectTimeout(self):
super(CollectorDaemon, self).connectTimeout()
return self._startup()
def _startup(self):
d = defer.maybeDeferred( self._getInitializationCallback() )
d.addCallback( self._startConfigCycle )
d.addCallback( self._startMaintenance )
d.addErrback( self._errorStop )
return d
def watchdogCycleTime(self):
"""
Return our cycle time (in minutes)
@return: cycle time
@rtype: integer
"""
return self.preferences.cycleInterval * 2
def getRemoteConfigServiceProxy(self):
"""
Called to retrieve the remote configuration service proxy object.
"""
return self.services.get(self.preferences.configurationService,
FakeRemote())
def generateEvent(self, event, **kw):
eventCopy = super(CollectorDaemon, self).generateEvent(event, **kw)
if eventCopy and eventCopy.get("device"):
device_id = eventCopy.get("device")
guid = self._deviceGuids.get(device_id)
if guid:
eventCopy['device_guid'] = guid
return eventCopy
def writeMetric(self, contextUUID, metric, value, metricType, contextId,
timestamp='N', min='U', max='U',
threshEventData={}, deviceuuid=None):
"""
Writes the metric to the metric publisher.
@param contextUUID: This is who the metric applies to. This is usually a component or a device.
@param metric: the name of the metric, we expect it to be of the form datasource_datapoint
@param value: the value of the metric
@param metricType: type of the metric (e.g. 'COUNTER', 'GUAGE', 'DERIVE' etc)
@param contextId: used for the threshold events, the id of who this metric is for
@param timestamp: defaults to time.time() if not specified, the time the metric occurred
@param min: used in the derive the min value for the metric
@param max: used in the derive the max value for the metric
@param threshEventData: extra data put into threshold events
@param deviceuuid: the unique identifier of the device for
this metric, maybe the same as contextUUID if the context is a
device
@return: a deferred that fires when the metric gets published
"""
timestamp = int(time.time()) if timestamp == 'N' else timestamp
data_source, data_point_name = metric.split("_")
tags = {
'datasource': data_source,
'uuid': contextUUID
}
if deviceuuid:
tags['device'] = deviceuuid
# write the raw metric to Redis
self._metric_writer.write_metric(
data_point_name, value, timestamp, tags)
# compute (and cache) a rate for COUNTER/DERIVE
if metricType in {'COUNTER', 'DERIVE'}:
value = self._derivative_tracker.derivative(
contextUUID, (int(value), timestamp), min, max)
# check for threshold breaches and send events when needed
if value is not None:
self._threshold_notifier.notify(contextUUID, contextId, metric, timestamp,
value, threshEventData)
@deprecated
def writeRRD(self, path, value, rrdType, rrdCommand=None, cycleTime=None,
min='U', max='U', threshEventData={}, timestamp='N', allowStaleDatapoint=True):
"""
Use writeMetric
"""
# we rely on the fact that rrdPath now returns the guid for an object
uuidInfo, metric = path.rsplit('/', 1)
if not 'METRIC_DATA' in str(uuidInfo):
raise Exception("Unable to write Metric with given path { %s } please see the rrdpath method" % str(uuidInfo))
uuidInfo = json.loads(uuidInfo)
# reroute to new writeMetric method
self.writeMetric(uuidInfo['contextUUID'],
metric,
value,
rrdType,
uuidInfo['contextId'],
timestamp,
min,
max,
threshEventData,
uuidInfo.get('deviceUUID', None)
)
def stop(self, ignored=""):
if self._stoppingCallback is not None:
try:
self._stoppingCallback()
except Exception:
self.log.exception('Exception while stopping daemon')
super(CollectorDaemon, self).stop( ignored )
def remote_deleteDevice(self, devId):
"""
Called remotely by ZenHub when a device we're monitoring is deleted.
"""
# guard against parsing updates during a disconnect
if devId is None:
return
self._deleteDevice(devId)
def remote_deleteDevices(self, deviceIds):
"""
Called remotely by ZenHub when devices we're monitoring are deleted.
"""
# guard against parsing updates during a disconnect
if deviceIds is None:
return
for devId in Zipper.load(deviceIds):
self._deleteDevice(devId)
def remote_updateDeviceConfig(self, config):
"""
Called remotely by ZenHub when asynchronous configuration updates occur.
"""
# guard against parsing updates during a disconnect
if config is None:
return
self.log.debug("Device %s updated", config.configId)
if not self.options.device or self.options.device in (config.id, config.configId):
self._updateConfig(config)
self._configProxy.updateConfigProxy(self.preferences, config)
def remote_updateDeviceConfigs(self, configs):
"""
Called remotely by ZenHub when asynchronous configuration updates occur.
"""
if configs is None:
return
for config in Zipper.load(configs):
self.remote_updateDeviceConfig(config)
def remote_notifyConfigChanged(self):
"""
Called from zenhub to notify that the entire config should be updated
"""
if self.reconfigureTimeout and self.reconfigureTimeout.active():
# We will run along with the already scheduled task
self.log.debug("notifyConfigChanged - using existing call")
return
self.log.debug("notifyConfigChanged - scheduling call in 30 seconds")
self.reconfigureTimeout = reactor.callLater(30, self._rebuildConfig)
def _rebuildConfig(self):
"""
Delete and re-add the configuration tasks to completely re-build the configuration.
"""
if self.reconfigureTimeout and not self.reconfigureTimeout.active():
self.reconfigureTimeout = None
self._scheduler.removeTasksForConfig(CONFIG_LOADER_NAME)
self._startConfigCycle()
def _rescheduleConfig(self, observable, attrName, oldValue, newValue, **kwargs):
"""
Delete and re-add the configuration tasks to start on new interval.
"""
if oldValue != newValue:
self.log.debug("Changing config task interval from %s to %s minutes" % (oldValue, newValue))
self._scheduler.removeTasksForConfig(CONFIG_LOADER_NAME)
#values are in minutes, scheduler takes seconds
self._startConfigCycle(startDelay=newValue * 60)
def _taskCompleteCallback(self, taskName):
# if we're not running a normal daemon cycle then we need to shutdown
# once all of our pending tasks have completed
if not self.options.cycle:
try:
self._pendingTasks.remove(taskName)
except ValueError:
pass
self._completedTasks += 1
# if all pending tasks have been completed then shutdown the daemon
if len(self._pendingTasks) == 0:
self._displayStatistics()
self.stop()
def _updateConfig(self, cfg):
configId = cfg.configId
self.log.debug("Processing configuration for %s", configId)
nextExpectedRuns = {}
if configId in self._devices:
tasksToRemove = self._scheduler.getTasksForConfig(configId)
nextExpectedRuns = { taskToRemove.name: self._scheduler.getNextExpectedRun(taskToRemove.name) for taskToRemove in tasksToRemove }
self._scheduler.removeTasks(task.name for task in tasksToRemove)
self._configListener.updated(cfg)
else:
self._devices.add(configId)
self._configListener.added(cfg)
newTasks = self._taskSplitter.splitConfiguration([cfg])
self.log.debug("Tasks for config %s: %s", configId, newTasks)
nowTime = time.time()
for (taskName, task_) in newTasks.iteritems():
#if not cycling run the task immediately otherwise let the scheduler
#decide when to run the task
now = not self.options.cycle
nextExpectedRun = nextExpectedRuns.get(taskName, None)
if nextExpectedRun:
startDelay = nextExpectedRun - nowTime
if startDelay <= 0:
# handle edge case where we are about to run
# so run immediately
now = True
task_.startDelay = 0
else:
task_.startDelay = startDelay
self._scheduler.addTask(task_, self._taskCompleteCallback, now)
# TODO: another hack?
if hasattr(cfg, 'thresholds'):
self.getThresholds().updateForDevice(configId, cfg.thresholds)
# if we're not running a normal daemon cycle then keep track of the
# tasks we just added for this device so that we can shutdown once
# all pending tasks have completed
if not self.options.cycle:
self._pendingTasks.append(taskName)
@defer.inlineCallbacks
def _updateDeviceConfigs(self, updatedConfigs, purgeOmitted):
"""
Update the device configurations for the devices managed by this
collector.
@param deviceConfigs a list of device configurations
@type deviceConfigs list of name,value tuples
"""
self.log.debug("updateDeviceConfigs: updatedConfigs=%s", (map(str, updatedConfigs)))
for cfg in updatedConfigs:
self._updateConfig(cfg)
# yield time to reactor so other things can happen
yield task.deferLater(reactor, 0, lambda: None)
if purgeOmitted:
self._purgeOmittedDevices(cfg.configId for cfg in updatedConfigs)
def _purgeOmittedDevices(self, updatedDevices):
"""
Delete all current devices that are omitted from the list of devices being updated.
@param updatedDevices a collection of device ids
@type updatedDevices a sequence of strings
"""
# remove tasks for the deleted devices
deletedDevices = set(self._devices) - set(updatedDevices)
self.log.debug("purgeOmittedDevices: deletedConfigs=%s", ','.join(deletedDevices))
for configId in deletedDevices:
self._deleteDevice(configId)
def _deleteDevice(self, deviceId):
self.log.debug("Device %s deleted" % deviceId)
self._devices.discard(deviceId)
self._configListener.deleted(deviceId)
self._configProxy.deleteConfigProxy(self.preferences, deviceId)
self._scheduler.removeTasksForConfig(deviceId)
def _errorStop(self, result):
"""
Twisted callback to receive fatal messages.
@param result: the Twisted failure
@type result: failure object
"""
if isinstance(result, Failure):
msg = result.getErrorMessage()
else:
msg = str(result)
self.log.critical("Unrecoverable Error: %s", msg)
self.stop()
def _startConfigCycle(self, result=None, startDelay=0):
configLoader = self._ConfigurationLoaderTask(CONFIG_LOADER_NAME,
taskConfig=self.preferences)
configLoader.startDelay = startDelay
# Don't add the config loader task if the scheduler already has
# an instance of it.
if configLoader not in self._scheduler:
# Run initial maintenance cycle as soon as possible
# TODO: should we not run maintenance if running in non-cycle mode?
self._scheduler.addTask(configLoader)
else:
self.log.info("%s already added to scheduler", configLoader.name)
return defer.succeed("Configuration loader task started")
def setPropertyItems(self, items):
"""
Override so that preferences are updated
"""
super(CollectorDaemon, self).setPropertyItems(items)
self._setCollectorPreferences(dict(items))
def _setCollectorPreferences(self, preferenceItems):
for name, value in preferenceItems.iteritems():
if not hasattr(self.preferences, name):
# TODO: make a super-low level debug mode? The following message isn't helpful
#self.log.debug("Preferences object does not have attribute %s",
# name)
setattr(self.preferences, name, value)
elif getattr(self.preferences, name) != value:
self.log.debug("Updated %s preference to %s", name, value)
setattr(self.preferences, name, value)
def _loadThresholdClasses(self, thresholdClasses):
self.log.debug("Loading classes %s", thresholdClasses)
for c in thresholdClasses:
try:
importClass(c)
except ImportError:
log.exception("Unable to import class %s", c)
def _configureThresholds(self, thresholds):
self.getThresholds().updateList(thresholds)
def _startMaintenance(self, ignored=None):
unused(ignored)
if not self.options.cycle:
self._maintenanceCycle()
return
if self.options.logTaskStats > 0:
log.debug("Starting Task Stat logging")
loop = task.LoopingCall(self._displayStatistics, verbose=True)
loop.start(self.options.logTaskStats, now=False)
log.debug("Starting Statistic posting")
loop = task.LoopingCall(self._postStatistics)
loop.start(self.options.writeStatistics, now=False)
interval = self.preferences.cycleInterval
self.log.debug("Initializing maintenance Cycle")
maintenanceCycle = MaintenanceCycle(interval, self, self._maintenanceCycle)
maintenanceCycle.start()
def _maintenanceCycle(self, ignored=None):
"""
Perform daemon maintenance processing on a periodic schedule. Initially
called after the daemon configuration loader task is added, but afterward
will self-schedule each run.
"""
self.log.debug("Performing periodic maintenance")
def _processDeviceIssues(result):
self.log.debug("deviceIssues=%r", result)
if result is None:
return result # exception or some other problem
# Device ping issues returns as a tuple of (deviceId, count, total)
# and we just want the device id
newUnresponsiveDevices = set(i[0] for i in result)
clearedDevices = self._unresponsiveDevices.difference(newUnresponsiveDevices)
for devId in clearedDevices:
self.log.debug("Resuming tasks for device %s", devId)
self._scheduler.resumeTasksForConfig(devId)
self._unresponsiveDevices = newUnresponsiveDevices
for devId in self._unresponsiveDevices:
self.log.debug("Pausing tasks for device %s", devId)
self._scheduler.pauseTasksForConfig(devId)
return result
def _getDeviceIssues():
# TODO: handle different types of device issues, such as WMI issues
d = self.getDevicePingIssues()
return d
def _maintenance():
if self.options.cycle:
if getattr(self.preferences, 'pauseUnreachableDevices', True):
d = defer.maybeDeferred(_getDeviceIssues)
d.addCallback(_processDeviceIssues)
else:
d = defer.succeed(None)
else:
d = defer.succeed("No maintenance required")
return d
d = _maintenance()
return d
def runPostConfigTasks(self, result=None):
"""
Add post-startup tasks from the preferences.
This may be called with the failure code as well.
"""
if isinstance(result, Failure):
pass
elif not self.addedPostStartupTasks:
postStartupTasks = getattr(self.preferences, 'postStartupTasks',
lambda : [])
for task in postStartupTasks():
self._scheduler.addTask(task, now=True)
self.addedPostStartupTasks = True
def _postStatistics(self):
self._displayStatistics()
# update and post statistics if we've been configured to do so
if self.rrdStats:
stat = self._statService.getStatistic("devices")
stat.value = len(self._devices)
# stat = self._statService.getStatistic("cyclePoints")
# stat.value = self._rrd.endCycle()
stat = self._statService.getStatistic("dataPoints")
stat.value = self.metricWriter().dataPoints
# Scheduler statistics
stat = self._statService.getStatistic("runningTasks")
stat.value = self._scheduler._executor.running
stat = self._statService.getStatistic("taskCount")
stat.value = self._scheduler.taskCount
stat = self._statService.getStatistic("queuedTasks")
stat.value = self._scheduler._executor.queued
stat = self._statService.getStatistic("missedRuns")
stat.value = self._scheduler.missedRuns
self._statService.postStatistics(self.rrdStats)
def _displayStatistics(self, verbose=False):
if self.metricWriter():
self.log.info("%d devices processed (%d datapoints)",
len(self._devices), self.metricWriter().dataPoints)
else:
self.log.info("%d devices processed (0 datapoints)",
len(self._devices))
self._scheduler.displayStatistics(verbose)
def _signalHandler(self, signum, frame):
self._displayStatistics(True)
def __init__(self,
preferences,
taskSplitter,
configurationListener=DUMMY_LISTENER,
initializationCallback=None,
stoppingCallback=None):
"""
Constructs a new instance of the CollectorDaemon framework. Normally
only a singleton instance of a CollectorDaemon should exist within a
process, but this is not enforced.
@param preferences: the collector configuration
@type preferences: ICollectorPreferences
@param taskSplitter: the task splitter to use for this collector
@type taskSplitter: ITaskSplitter
@param initializationCallback: a callable that will be executed after
connection to the hub but before
retrieving configuration information
@type initializationCallback: any callable
@param stoppingCallback: a callable that will be executed first during
the stopping process. Exceptions will be
logged but otherwise ignored.
@type stoppingCallback: any callable
"""
# create the configuration first, so we have the collector name
# available before activating the rest of the Daemon class hierarchy.
if not ICollectorPreferences.providedBy(preferences):
raise TypeError("configuration must provide ICollectorPreferences")
else:
self._prefs = ObservableProxy(preferences)
self._prefs.attachAttributeObserver('configCycleInterval',
self._rescheduleConfig)
if not ITaskSplitter.providedBy(taskSplitter):
raise TypeError("taskSplitter must provide ITaskSplitter")
else:
self._taskSplitter = taskSplitter
if not IConfigurationListener.providedBy(configurationListener):
raise TypeError(
"configurationListener must provide IConfigurationListener")
self._configListener = ConfigListenerNotifier()
self._configListener.addListener(configurationListener)
self._configListener.addListener(DeviceGuidListener(self))
self._initializationCallback = initializationCallback
self._stoppingCallback = stoppingCallback
# register the various interfaces we provide the rest of the system so
# that collector implementors can easily retrieve a reference back here
# if needed
zope.component.provideUtility(self, ICollector)
zope.component.provideUtility(self, IEventService)
zope.component.provideUtility(self, IDataService)
# register the collector's own preferences object so it may be easily
# retrieved by factories, tasks, etc.
zope.component.provideUtility(self.preferences, ICollectorPreferences,
self.preferences.collectorName)
super(CollectorDaemon,
self).__init__(name=self.preferences.collectorName)
self._statService = StatisticsService()
zope.component.provideUtility(self._statService, IStatisticsService)
if self.options.cycle:
# setup daemon statistics (deprecated names)
self._statService.addStatistic("devices", "GAUGE")
self._statService.addStatistic("dataPoints", "DERIVE")
self._statService.addStatistic("runningTasks", "GAUGE")
self._statService.addStatistic("taskCount", "GAUGE")
self._statService.addStatistic("queuedTasks", "GAUGE")
self._statService.addStatistic("missedRuns", "GAUGE")
# namespace these a bit so they can be used in ZP monitoring.
# prefer these stat names and metrology in future refs
self._dataPointsMetric = Metrology.meter(
"collectordaemon.dataPoints")
daemon = self
class DeviceGauge(Gauge):
@property
def value(self):
return len(daemon._devices)
Metrology.gauge('collectordaemon.devices', DeviceGauge())
# Scheduler statistics
class RunningTasks(Gauge):
@property
def value(self):
return daemon._scheduler._executor.running
Metrology.gauge('collectordaemon.runningTasks', RunningTasks())
class TaskCount(Gauge):
@property
def value(self):
return daemon._scheduler.taskCount
Metrology.gauge('collectordaemon.taskCount', TaskCount())
class QueuedTasks(Gauge):
@property
def value(self):
return daemon._scheduler._executor.queued
Metrology.gauge('collectordaemon.queuedTasks', QueuedTasks())
class MissedRuns(Gauge):
@property
def value(self):
return daemon._scheduler.missedRuns
Metrology.gauge('collectordaemon.missedRuns', MissedRuns())
self._deviceGuids = {}
self._devices = set()
self._unresponsiveDevices = set()
self._rrd = None
self._metric_writer = None
self._derivative_tracker = None
self.reconfigureTimeout = None
# keep track of pending tasks if we're doing a single run, and not a
# continuous cycle
if not self.options.cycle:
self._completedTasks = 0
self._pendingTasks = []
frameworkFactory = zope.component.queryUtility(
IFrameworkFactory, self._frameworkFactoryName)
self._configProxy = frameworkFactory.getConfigurationProxy()
self._scheduler = frameworkFactory.getScheduler()
self._scheduler.maxTasks = self.options.maxTasks
self._ConfigurationLoaderTask = frameworkFactory.getConfigurationLoaderTask(
)
# OLD - set the initialServices attribute so that the PBDaemon class
# will load all of the remote services we need.
self.initialServices = PBDaemon.initialServices +\
[self.preferences.configurationService]
# trap SIGUSR2 so that we can display detailed statistics
signal.signal(signal.SIGUSR2, self._signalHandler)
# let the configuration do any additional startup it might need
self.preferences.postStartup()
self.addedPostStartupTasks = False
# Variables used by enterprise collector in resmgr
#
# flag that indicates we have finished loading the configs for the first time after a restart
self.firstConfigLoadDone = False
# flag that indicates the daemon has received the encryption key from zenhub
self.encryptionKeyInitialized = False
# flag that indicates the daemon is loading the cached configs
self.loadingCachedConfigs = False
class CollectorDaemon(RRDDaemon):
"""
The daemon class for the entire ZenCollector framework. This class bridges
the gap between the older daemon framework and ZenCollector. New collectors
no longer should extend this class to implement a new collector.
"""
zope.interface.implements(ICollector, IDataService, IEventService)
_frameworkFactoryName = ""
# So users (subclasses) can check for metric tag support without inspect.
metricExtraTags = True
@property
def preferences(self):
"""
Preferences for this daemon
"""
return self._prefs
def __init__(self,
preferences,
taskSplitter,
configurationListener=DUMMY_LISTENER,
initializationCallback=None,
stoppingCallback=None):
"""
Constructs a new instance of the CollectorDaemon framework. Normally
only a singleton instance of a CollectorDaemon should exist within a
process, but this is not enforced.
@param preferences: the collector configuration
@type preferences: ICollectorPreferences
@param taskSplitter: the task splitter to use for this collector
@type taskSplitter: ITaskSplitter
@param initializationCallback: a callable that will be executed after
connection to the hub but before
retrieving configuration information
@type initializationCallback: any callable
@param stoppingCallback: a callable that will be executed first during
the stopping process. Exceptions will be
logged but otherwise ignored.
@type stoppingCallback: any callable
"""
# create the configuration first, so we have the collector name
# available before activating the rest of the Daemon class hierarchy.
if not ICollectorPreferences.providedBy(preferences):
raise TypeError("configuration must provide ICollectorPreferences")
else:
self._prefs = ObservableProxy(preferences)
self._prefs.attachAttributeObserver('configCycleInterval',
self._rescheduleConfig)
if not ITaskSplitter.providedBy(taskSplitter):
raise TypeError("taskSplitter must provide ITaskSplitter")
else:
self._taskSplitter = taskSplitter
if not IConfigurationListener.providedBy(configurationListener):
raise TypeError(
"configurationListener must provide IConfigurationListener")
self._configListener = ConfigListenerNotifier()
self._configListener.addListener(configurationListener)
self._configListener.addListener(DeviceGuidListener(self))
self._initializationCallback = initializationCallback
self._stoppingCallback = stoppingCallback
# register the various interfaces we provide the rest of the system so
# that collector implementors can easily retrieve a reference back here
# if needed
zope.component.provideUtility(self, ICollector)
zope.component.provideUtility(self, IEventService)
zope.component.provideUtility(self, IDataService)
# register the collector's own preferences object so it may be easily
# retrieved by factories, tasks, etc.
zope.component.provideUtility(self.preferences, ICollectorPreferences,
self.preferences.collectorName)
super(CollectorDaemon,
self).__init__(name=self.preferences.collectorName)
self._statService = StatisticsService()
zope.component.provideUtility(self._statService, IStatisticsService)
if self.options.cycle:
# setup daemon statistics (deprecated names)
self._statService.addStatistic("devices", "GAUGE")
self._statService.addStatistic("dataPoints", "DERIVE")
self._statService.addStatistic("runningTasks", "GAUGE")
self._statService.addStatistic("taskCount", "GAUGE")
self._statService.addStatistic("queuedTasks", "GAUGE")
self._statService.addStatistic("missedRuns", "GAUGE")
# namespace these a bit so they can be used in ZP monitoring.
# prefer these stat names and metrology in future refs
self._dataPointsMetric = Metrology.meter(
"collectordaemon.dataPoints")
daemon = self
class DeviceGauge(Gauge):
@property
def value(self):
return len(daemon._devices)
Metrology.gauge('collectordaemon.devices', DeviceGauge())
# Scheduler statistics
class RunningTasks(Gauge):
@property
def value(self):
return daemon._scheduler._executor.running
Metrology.gauge('collectordaemon.runningTasks', RunningTasks())
class TaskCount(Gauge):
@property
def value(self):
return daemon._scheduler.taskCount
Metrology.gauge('collectordaemon.taskCount', TaskCount())
class QueuedTasks(Gauge):
@property
def value(self):
return daemon._scheduler._executor.queued
Metrology.gauge('collectordaemon.queuedTasks', QueuedTasks())
class MissedRuns(Gauge):
@property
def value(self):
return daemon._scheduler.missedRuns
Metrology.gauge('collectordaemon.missedRuns', MissedRuns())
self._deviceGuids = {}
self._devices = set()
self._unresponsiveDevices = set()
self._rrd = None
self._metric_writer = None
self._derivative_tracker = None
self.reconfigureTimeout = None
# keep track of pending tasks if we're doing a single run, and not a
# continuous cycle
if not self.options.cycle:
self._completedTasks = 0
self._pendingTasks = []
frameworkFactory = zope.component.queryUtility(
IFrameworkFactory, self._frameworkFactoryName)
self._configProxy = frameworkFactory.getConfigurationProxy()
self._scheduler = frameworkFactory.getScheduler()
self._scheduler.maxTasks = self.options.maxTasks
self._ConfigurationLoaderTask = frameworkFactory.getConfigurationLoaderTask(
)
# OLD - set the initialServices attribute so that the PBDaemon class
# will load all of the remote services we need.
self.initialServices = PBDaemon.initialServices +\
[self.preferences.configurationService]
# trap SIGUSR2 so that we can display detailed statistics
signal.signal(signal.SIGUSR2, self._signalHandler)
# let the configuration do any additional startup it might need
self.preferences.postStartup()
self.addedPostStartupTasks = False
# Variables used by enterprise collector in resmgr
#
# flag that indicates we have finished loading the configs for the first time after a restart
self.firstConfigLoadDone = False
# flag that indicates the daemon has received the encryption key from zenhub
self.encryptionKeyInitialized = False
# flag that indicates the daemon is loading the cached configs
self.loadingCachedConfigs = False
def buildOptions(self):
"""
Method called by CmdBase.__init__ to build all of the possible
command-line options for this collector daemon.
"""
super(CollectorDaemon, self).buildOptions()
maxTasks = getattr(self.preferences, 'maxTasks', None)
defaultMax = maxTasks if maxTasks else 500
self.parser.add_option(
'--maxparallel',
dest='maxTasks',
type='int',
default=defaultMax,
help='Max number of tasks to run at once, default %default')
self.parser.add_option(
'--logTaskStats',
dest='logTaskStats',
type='int',
default=0,
help=
'How often to logs statistics of current tasks, value in seconds; very verbose'
)
addWorkerOptions(self.parser)
self.parser.add_option(
'--traceMetricName',
dest='traceMetricName',
type='string',
default=None,
help='trace metrics whose name matches this regex')
self.parser.add_option(
'--traceMetricKey',
dest='traceMetricKey',
type='string',
default=None,
help='trace metrics whose key value matches this regex')
frameworkFactory = zope.component.queryUtility(
IFrameworkFactory, self._frameworkFactoryName)
if hasattr(frameworkFactory, 'getFrameworkBuildOptions'):
# During upgrades we'll be missing this option
self._frameworkBuildOptions = frameworkFactory.getFrameworkBuildOptions(
)
if self._frameworkBuildOptions:
self._frameworkBuildOptions(self.parser)
# give the collector configuration a chance to add options, too
self.preferences.buildOptions(self.parser)
def parseOptions(self):
super(CollectorDaemon, self).parseOptions()
self.preferences.options = self.options
configFilter = parseWorkerOptions(self.options.__dict__)
if configFilter:
self.preferences.configFilter = configFilter
def connected(self):
"""
Method called by PBDaemon after a connection to ZenHub is established.
"""
return self._startup()
def _getInitializationCallback(self):
def doNothing():
pass
if self._initializationCallback is not None:
return self._initializationCallback
else:
return doNothing
def connectTimeout(self):
super(CollectorDaemon, self).connectTimeout()
return self._startup()
def _startup(self):
d = defer.maybeDeferred(self._getInitializationCallback())
d.addCallback(self._initEncryptionKey)
d.addCallback(self._startConfigCycle)
d.addCallback(self._startMaintenance)
d.addErrback(self._errorStop)
return d
@defer.inlineCallbacks
def _initEncryptionKey(self, prv_cb_result=None):
# encrypt dummy msg in order to initialize the encryption key
data = yield self._configProxy.encrypt(
"Hello") # block until we get the key
if data: # encrypt returns None if an exception is raised
self.encryptionKeyInitialized = True
self.log.info("Daemon's encryption key initialized")
def watchdogCycleTime(self):
"""
Return our cycle time (in minutes)
@return: cycle time
@rtype: integer
"""
return self.preferences.cycleInterval * 2
def getRemoteConfigServiceProxy(self):
"""
Called to retrieve the remote configuration service proxy object.
"""
return self.services.get(self.preferences.configurationService,
FakeRemote())
def generateEvent(self, event, **kw):
eventCopy = super(CollectorDaemon, self).generateEvent(event, **kw)
if eventCopy and eventCopy.get("device"):
device_id = eventCopy.get("device")
guid = self._deviceGuids.get(device_id)
if guid:
eventCopy['device_guid'] = guid
return eventCopy
def should_trace_metric(self, metric, contextkey):
"""
Tracer implementation - use this function to indicate whether a given
metric/contextkey combination is to be traced.
:param metric: name of the metric in question
:param contextkey: context key of the metric in question
:return: boolean indicating whether to trace this metric/key
"""
tests = []
if self.options.traceMetricName:
tests.append((self.options.traceMetricName, metric))
if self.options.traceMetricKey:
tests.append((self.options.traceMetricKey, contextkey))
result = [bool(re.search(exp, subj)) for exp, subj in tests]
return len(result) > 0 and all(result)
@defer.inlineCallbacks
def writeMetric(self,
contextKey,
metric,
value,
metricType,
contextId,
timestamp='N',
min='U',
max='U',
threshEventData=None,
deviceId=None,
contextUUID=None,
deviceUUID=None,
extraTags=None):
"""
Writes the metric to the metric publisher.
@param contextKey: This is who the metric applies to. This is usually
the return value of rrdPath() for a component or
device.
@param metric: the name of the metric, we expect it to be of the form datasource_datapoint
@param value: the value of the metric
@param metricType: type of the metric (e.g. 'COUNTER', 'GAUGE', 'DERIVE' etc)
@param contextId: used for the threshold events, the id of who this metric is for
@param timestamp: defaults to time.time() if not specified, the time the metric occurred
@param min: used in the derive the min value for the metric
@param max: used in the derive the max value for the metric
@param threshEventData: extra data put into threshold events
@param deviceId: the id of the device for this metric
@return: a deferred that fires when the metric gets published
"""
timestamp = int(time.time()) if timestamp == 'N' else timestamp
tags = {'contextUUID': contextUUID, 'key': contextKey}
if self.should_trace_metric(metric, contextKey):
tags['mtrace'] = "{}".format(int(time.time()))
metric_name = metric
if deviceId:
tags['device'] = deviceId
# compute (and cache) a rate for COUNTER/DERIVE
if metricType in {'COUNTER', 'DERIVE'}:
if metricType == 'COUNTER' and min == 'U':
# COUNTER implies only positive derivatives are valid.
min = 0
dkey = "%s:%s" % (contextUUID, metric)
value = self._derivative_tracker.derivative(
dkey, (float(value), timestamp), min, max)
# check for threshold breaches and send events when needed
if value is not None:
if extraTags:
tags.update(extraTags)
# write the metric to Redis
try:
yield defer.maybeDeferred(self._metric_writer.write_metric,
metric_name, value, timestamp, tags)
except Exception as e:
self.log.debug("Error sending metric %s", e)
yield defer.maybeDeferred(self._threshold_notifier.notify,
contextUUID, contextId, metric,
timestamp, value, threshEventData)
def writeMetricWithMetadata(self,
metric,
value,
metricType,
timestamp='N',
min='U',
max='U',
threshEventData=None,
metadata=None,
extraTags=None):
metadata = metadata or {}
try:
key = metadata['contextKey']
contextId = metadata['contextId']
deviceId = metadata['deviceId']
contextUUID = metadata['contextUUID']
if metadata:
metric_name = metrics.ensure_prefix(metadata, metric)
else:
metric_name = metric
except KeyError as e:
raise Exception("Missing necessary metadata: %s" % e.message)
return self.writeMetric(key,
metric_name,
value,
metricType,
contextId,
timestamp=timestamp,
min=min,
max=max,
threshEventData=threshEventData,
deviceId=deviceId,
contextUUID=contextUUID,
deviceUUID=metadata.get('deviceUUID'),
extraTags=extraTags)
@deprecated
def writeRRD(self,
path,
value,
rrdType,
rrdCommand=None,
cycleTime=None,
min='U',
max='U',
threshEventData={},
timestamp='N',
allowStaleDatapoint=True):
"""
Use writeMetric
"""
# we rely on the fact that rrdPath now returns more information than just the path
metricinfo, metric = path.rsplit('/', 1)
if 'METRIC_DATA' not in str(metricinfo):
raise Exception(
"Unable to write Metric with given path { %s } please see the rrdpath method"
% str(metricinfo))
metadata = json.loads(metricinfo)
# reroute to new writeMetric method
return self.writeMetricWithMetadata(metric, value, rrdType, timestamp,
min, max, threshEventData,
metadata)
def stop(self, ignored=""):
if self._stoppingCallback is not None:
try:
self._stoppingCallback()
except Exception:
self.log.exception('Exception while stopping daemon')
super(CollectorDaemon, self).stop(ignored)
def remote_deleteDevice(self, devId):
"""
Called remotely by ZenHub when a device we're monitoring is deleted.
"""
# guard against parsing updates during a disconnect
if devId is None:
return
self._deleteDevice(devId)
def remote_deleteDevices(self, deviceIds):
"""
Called remotely by ZenHub when devices we're monitoring are deleted.
"""
# guard against parsing updates during a disconnect
if deviceIds is None:
return
for devId in Zipper.load(deviceIds):
self._deleteDevice(devId)
def remote_updateDeviceConfig(self, config):
"""
Called remotely by ZenHub when asynchronous configuration updates occur.
"""
# guard against parsing updates during a disconnect
if config is None:
return
self.log.debug("Device %s updated", config.configId)
if self._updateConfig(config):
self._configProxy.updateConfigProxy(self.preferences, config)
else:
self.log.debug("Device %s config filtered", config.configId)
def remote_updateDeviceConfigs(self, configs):
"""
Called remotely by ZenHub when asynchronous configuration updates occur.
"""
if configs is None:
return
configs = Zipper.load(configs)
self.log.debug(
"remote_updateDeviceConfigs: workerid %s processing %s device configs",
self.options.workerid, len(configs))
for config in configs:
self.remote_updateDeviceConfig(config)
def remote_notifyConfigChanged(self):
"""
Called from zenhub to notify that the entire config should be updated
"""
if self.reconfigureTimeout and self.reconfigureTimeout.active():
# We will run along with the already scheduled task
self.log.debug("notifyConfigChanged - using existing call")
return
self.log.debug("notifyConfigChanged - scheduling call in 30 seconds")
self.reconfigureTimeout = reactor.callLater(30, self._rebuildConfig)
def _rebuildConfig(self):
"""
Delete and re-add the configuration tasks to completely re-build the configuration.
"""
if self.reconfigureTimeout and not self.reconfigureTimeout.active():
self.reconfigureTimeout = None
self._scheduler.removeTasksForConfig(CONFIG_LOADER_NAME)
self._startConfigCycle()
def _rescheduleConfig(self, observable, attrName, oldValue, newValue,
**kwargs):
"""
Delete and re-add the configuration tasks to start on new interval.
"""
if oldValue != newValue:
self.log.debug(
"Changing config task interval from %s to %s minutes" %
(oldValue, newValue))
self._scheduler.removeTasksForConfig(CONFIG_LOADER_NAME)
#values are in minutes, scheduler takes seconds
self._startConfigCycle(startDelay=newValue * 60)
def _taskCompleteCallback(self, taskName):
# if we're not running a normal daemon cycle then we need to shutdown
# once all of our pending tasks have completed
if not self.options.cycle:
try:
self._pendingTasks.remove(taskName)
except ValueError:
pass
self._completedTasks += 1
# if all pending tasks have been completed then shutdown the daemon
if len(self._pendingTasks) == 0:
self._displayStatistics()
self.stop()
def _updateConfig(self, cfg):
"""
Update device configuration. Returns true if config is updated, false if config is skipped
"""
# guard against parsing updates during a disconnect
if cfg is None:
return False
configFilter = getattr(self.preferences, "configFilter",
None) or (lambda x: True)
if not ((not self.options.device and configFilter(cfg))
or self.options.device in (cfg.id, cfg.configId)):
self.log.info("Device %s config filtered", cfg.configId)
return False
configId = cfg.configId
self.log.debug("Processing configuration for %s", configId)
nextExpectedRuns = {}
if configId in self._devices:
tasksToRemove = self._scheduler.getTasksForConfig(configId)
nextExpectedRuns = {
taskToRemove.name:
self._scheduler.getNextExpectedRun(taskToRemove.name)
for taskToRemove in tasksToRemove
}
self._scheduler.removeTasks(task.name for task in tasksToRemove)
self._configListener.updated(cfg)
else:
self._devices.add(configId)
self._configListener.added(cfg)
newTasks = self._taskSplitter.splitConfiguration([cfg])
self.log.debug("Tasks for config %s: %s", configId, newTasks)
nowTime = time.time()
for (taskName, task_) in newTasks.iteritems():
#if not cycling run the task immediately otherwise let the scheduler
#decide when to run the task
now = not self.options.cycle
nextExpectedRun = nextExpectedRuns.get(taskName, None)
if nextExpectedRun:
startDelay = nextExpectedRun - nowTime
if startDelay <= 0:
# handle edge case where we are about to run
# so run immediately
now = True
task_.startDelay = 0
else:
task_.startDelay = startDelay
try:
self._scheduler.addTask(task_, self._taskCompleteCallback, now)
except ValueError:
self.log.exception("Error adding device config")
continue
# TODO: another hack?
if hasattr(cfg, 'thresholds'):
self.getThresholds().updateForDevice(configId, cfg.thresholds)
# if we're not running a normal daemon cycle then keep track of the
# tasks we just added for this device so that we can shutdown once
# all pending tasks have completed
if not self.options.cycle:
self._pendingTasks.append(taskName)
# put tasks on pause after configuration update to prevent unnecessary collections ZEN-25463
if configId in self._unresponsiveDevices:
self.log.debug("Pausing tasks for device %s", configId)
self._scheduler.pauseTasksForConfig(configId)
return True
@defer.inlineCallbacks
def _updateDeviceConfigs(self, updatedConfigs, purgeOmitted):
"""
Update the device configurations for the devices managed by this
collector.
@param deviceConfigs a list of device configurations
@type deviceConfigs list of name,value tuples
"""
self.log.debug("updateDeviceConfigs: updatedConfigs=%s",
(map(str, updatedConfigs)))
for cfg in updatedConfigs:
self._updateConfig(cfg)
# yield time to reactor so other things can happen
yield task.deferLater(reactor, 0, lambda: None)
if purgeOmitted:
self._purgeOmittedDevices(cfg.configId for cfg in updatedConfigs)
def _purgeOmittedDevices(self, updatedDevices):
"""
Delete all current devices that are omitted from the list of devices being updated.
@param updatedDevices a collection of device ids
@type updatedDevices a sequence of strings
"""
# remove tasks for the deleted devices
deletedDevices = set(self._devices) - set(updatedDevices)
self.log.debug("purgeOmittedDevices: deletedConfigs=%s",
','.join(deletedDevices))
for configId in deletedDevices:
self._deleteDevice(configId)
def _deleteDevice(self, deviceId):
self.log.debug("Device %s deleted" % deviceId)
self._devices.discard(deviceId)
self._configListener.deleted(deviceId)
self._configProxy.deleteConfigProxy(self.preferences, deviceId)
self._scheduler.removeTasksForConfig(deviceId)
def _errorStop(self, result):
"""
Twisted callback to receive fatal messages.
@param result: the Twisted failure
@type result: failure object
"""
if isinstance(result, Failure):
msg = result.getErrorMessage()
else:
msg = str(result)
self.log.critical("Unrecoverable Error: %s", msg)
self.stop()
def _startConfigCycle(self, result=None, startDelay=0):
configLoader = self._ConfigurationLoaderTask(
CONFIG_LOADER_NAME, taskConfig=self.preferences)
configLoader.startDelay = startDelay
# Don't add the config loader task if the scheduler already has
# an instance of it.
if configLoader not in self._scheduler:
# Run initial maintenance cycle as soon as possible
# TODO: should we not run maintenance if running in non-cycle mode?
self._scheduler.addTask(configLoader)
else:
self.log.info("%s already added to scheduler", configLoader.name)
return defer.succeed("Configuration loader task started")
def setPropertyItems(self, items):
"""
Override so that preferences are updated
"""
super(CollectorDaemon, self).setPropertyItems(items)
self._setCollectorPreferences(dict(items))
def _setCollectorPreferences(self, preferenceItems):
for name, value in preferenceItems.iteritems():
if not hasattr(self.preferences, name):
# TODO: make a super-low level debug mode? The following message isn't helpful
#self.log.debug("Preferences object does not have attribute %s",
# name)
setattr(self.preferences, name, value)
elif getattr(self.preferences, name) != value:
self.log.debug("Updated %s preference to %s", name, value)
setattr(self.preferences, name, value)
def _loadThresholdClasses(self, thresholdClasses):
self.log.debug("Loading classes %s", thresholdClasses)
for c in thresholdClasses:
try:
importClass(c)
except ImportError:
log.exception("Unable to import class %s", c)
def _configureThresholds(self, thresholds):
self.getThresholds().updateList(thresholds)
def _startMaintenance(self, ignored=None):
unused(ignored)
if not self.options.cycle:
self._maintenanceCycle()
return
if self.options.logTaskStats > 0:
log.debug("Starting Task Stat logging")
loop = task.LoopingCall(self._displayStatistics, verbose=True)
loop.start(self.options.logTaskStats, now=False)
interval = self.preferences.cycleInterval
self.log.debug("Initializing maintenance Cycle")
heartbeatSender = self if self.worker_id == 0 else None
maintenanceCycle = MaintenanceCycle(interval, heartbeatSender,
self._maintenanceCycle)
maintenanceCycle.start()
@defer.inlineCallbacks
def _maintenanceCycle(self, ignored=None):
"""
Perform daemon maintenance processing on a periodic schedule. Initially
called after the daemon configuration loader task is added,
but afterward will self-schedule each run.
"""
try:
self.log.debug("Performing periodic maintenance")
if not self.options.cycle:
ret = "No maintenance required"
elif getattr(self.preferences, 'pauseUnreachableDevices', True):
# TODO: handle different types of device issues
ret = yield self._pauseUnreachableDevices()
else:
ret = None
defer.returnValue(ret)
except Exception:
self.log.exception('failure in _maintenanceCycle')
raise
@defer.inlineCallbacks
def _pauseUnreachableDevices(self):
issues = yield self.getDevicePingIssues()
self.log.debug("deviceIssues=%r", issues)
if issues is None:
defer.returnValue(issues) # exception or some other problem
# Device ping issues returns as a tuple of (deviceId, count, total)
# and we just want the device id
newUnresponsiveDevices = set(i[0] for i in issues)
clearedDevices = self._unresponsiveDevices.difference(
newUnresponsiveDevices)
for devId in clearedDevices:
self.log.debug("Resuming tasks for device %s", devId)
self._scheduler.resumeTasksForConfig(devId)
self._unresponsiveDevices = newUnresponsiveDevices
for devId in self._unresponsiveDevices:
self.log.debug("Pausing tasks for device %s", devId)
self._scheduler.pauseTasksForConfig(devId)
defer.returnValue(issues)
def runPostConfigTasks(self, result=None):
"""
Add post-startup tasks from the preferences.
This may be called with the failure code as well.
"""
if isinstance(result, Failure):
pass
elif not self.addedPostStartupTasks:
postStartupTasks = getattr(self.preferences, 'postStartupTasks',
lambda: [])
for task in postStartupTasks():
self._scheduler.addTask(task, now=True)
self.addedPostStartupTasks = True
def postStatisticsImpl(self):
self._displayStatistics()
# update and post statistics if we've been configured to do so
if self.rrdStats:
stat = self._statService.getStatistic("devices")
stat.value = len(self._devices)
# stat = self._statService.getStatistic("cyclePoints")
# stat.value = self._rrd.endCycle()
stat = self._statService.getStatistic("dataPoints")
stat.value = self.metricWriter().dataPoints
# Scheduler statistics
stat = self._statService.getStatistic("runningTasks")
stat.value = self._scheduler._executor.running
stat = self._statService.getStatistic("taskCount")
stat.value = self._scheduler.taskCount
stat = self._statService.getStatistic("queuedTasks")
stat.value = self._scheduler._executor.queued
stat = self._statService.getStatistic("missedRuns")
stat.value = self._scheduler.missedRuns
diff = self.metricWriter(
).dataPoints - self._dataPointsMetric.count
self._dataPointsMetric.mark(diff)
self._statService.postStatistics(self.rrdStats)
def _displayStatistics(self, verbose=False):
if self.metricWriter():
self.log.info("%d devices processed (%d datapoints)",
len(self._devices),
self.metricWriter().dataPoints)
else:
self.log.info("%d devices processed (0 datapoints)",
len(self._devices))
self._scheduler.displayStatistics(verbose)
def _signalHandler(self, signum, frame):
self._displayStatistics(True)
@property
def worker_count(self):
"""
worker_count for this daemon
"""
return getattr(self.options, 'workers', 1)
@property
def worker_id(self):
"""
worker_id for this particular peer
"""
return getattr(self.options, 'workerid', 0)
def __init__(self,
preferences,
taskSplitter,
configurationListener=DUMMY_LISTENER,
initializationCallback=None,
stoppingCallback=None):
"""
Constructs a new instance of the CollectorDaemon framework. Normally
only a singleton instance of a CollectorDaemon should exist within a
process, but this is not enforced.
@param preferences: the collector configuration
@type preferences: ICollectorPreferences
@param taskSplitter: the task splitter to use for this collector
@type taskSplitter: ITaskSplitter
@param initializationCallback: a callable that will be executed after
connection to the hub but before
retrieving configuration information
@type initializationCallback: any callable
@param stoppingCallback: a callable that will be executed first during
the stopping process. Exceptions will be
logged but otherwise ignored.
@type stoppingCallback: any callable
"""
# create the configuration first, so we have the collector name
# available before activating the rest of the Daemon class hierarchy.
if not ICollectorPreferences.providedBy(preferences):
raise TypeError("configuration must provide ICollectorPreferences")
else:
self._prefs = ObservableProxy(preferences)
self._prefs.attachAttributeObserver('configCycleInterval',
self._rescheduleConfig)
if not ITaskSplitter.providedBy(taskSplitter):
raise TypeError("taskSplitter must provide ITaskSplitter")
else:
self._taskSplitter = taskSplitter
if not IConfigurationListener.providedBy(configurationListener):
raise TypeError(
"configurationListener must provide IConfigurationListener")
self._configListener = ConfigListenerNotifier()
self._configListener.addListener(configurationListener)
self._configListener.addListener(DeviceGuidListener(self))
self._initializationCallback = initializationCallback
self._stoppingCallback = stoppingCallback
# register the various interfaces we provide the rest of the system so
# that collector implementors can easily retrieve a reference back here
# if needed
zope.component.provideUtility(self, ICollector)
zope.component.provideUtility(self, IEventService)
zope.component.provideUtility(self, IDataService)
# setup daemon statistics
self._statService = StatisticsService()
self._statService.addStatistic("devices", "GAUGE")
self._statService.addStatistic("cyclePoints", "GAUGE")
self._statService.addStatistic("dataPoints", "DERIVE")
self._statService.addStatistic("runningTasks", "GAUGE")
self._statService.addStatistic("queuedTasks", "GAUGE")
self._statService.addStatistic("missedRuns", "GAUGE")
zope.component.provideUtility(self._statService, IStatisticsService)
# register the collector's own preferences object so it may be easily
# retrieved by factories, tasks, etc.
zope.component.provideUtility(self.preferences, ICollectorPreferences,
self.preferences.collectorName)
super(CollectorDaemon,
self).__init__(name=self.preferences.collectorName)
self._deviceGuids = {}
self._devices = set()
self._thresholds = Thresholds()
self._unresponsiveDevices = set()
self._rrd = None
self.reconfigureTimeout = None
# keep track of pending tasks if we're doing a single run, and not a
# continuous cycle
if not self.options.cycle:
self._completedTasks = 0
self._pendingTasks = []
frameworkFactory = zope.component.queryUtility(
IFrameworkFactory, self._frameworkFactoryName)
self._configProxy = frameworkFactory.getConfigurationProxy()
self._scheduler = frameworkFactory.getScheduler()
self._scheduler.maxTasks = self.options.maxTasks
self._ConfigurationLoaderTask = frameworkFactory.getConfigurationLoaderTask(
)
# OLD - set the initialServices attribute so that the PBDaemon class
# will load all of the remote services we need.
self.initialServices = PBDaemon.initialServices +\
[self.preferences.configurationService]
# trap SIGUSR2 so that we can display detailed statistics
signal.signal(signal.SIGUSR2, self._signalHandler)
# let the configuration do any additional startup it might need
self.preferences.postStartup()
self.addedPostStartupTasks = False
class CollectorDaemon(RRDDaemon):
"""
The daemon class for the entire ZenCollector framework. This class bridges
the gap between the older daemon framework and ZenCollector. New collectors
no longer should extend this class to implement a new collector.
"""
zope.interface.implements(ICollector, IDataService, IEventService)
_frameworkFactoryName = ""
@property
def preferences(self):
"""
Preferences for this daemon
"""
return self._prefs
def __init__(self,
preferences,
taskSplitter,
configurationListener=DUMMY_LISTENER,
initializationCallback=None,
stoppingCallback=None):
"""
Constructs a new instance of the CollectorDaemon framework. Normally
only a singleton instance of a CollectorDaemon should exist within a
process, but this is not enforced.
@param preferences: the collector configuration
@type preferences: ICollectorPreferences
@param taskSplitter: the task splitter to use for this collector
@type taskSplitter: ITaskSplitter
@param initializationCallback: a callable that will be executed after
connection to the hub but before
retrieving configuration information
@type initializationCallback: any callable
@param stoppingCallback: a callable that will be executed first during
the stopping process. Exceptions will be
logged but otherwise ignored.
@type stoppingCallback: any callable
"""
# create the configuration first, so we have the collector name
# available before activating the rest of the Daemon class hierarchy.
if not ICollectorPreferences.providedBy(preferences):
raise TypeError("configuration must provide ICollectorPreferences")
else:
self._prefs = ObservableProxy(preferences)
self._prefs.attachAttributeObserver('configCycleInterval',
self._rescheduleConfig)
if not ITaskSplitter.providedBy(taskSplitter):
raise TypeError("taskSplitter must provide ITaskSplitter")
else:
self._taskSplitter = taskSplitter
if not IConfigurationListener.providedBy(configurationListener):
raise TypeError(
"configurationListener must provide IConfigurationListener")
self._configListener = ConfigListenerNotifier()
self._configListener.addListener(configurationListener)
self._configListener.addListener(DeviceGuidListener(self))
self._initializationCallback = initializationCallback
self._stoppingCallback = stoppingCallback
# register the various interfaces we provide the rest of the system so
# that collector implementors can easily retrieve a reference back here
# if needed
zope.component.provideUtility(self, ICollector)
zope.component.provideUtility(self, IEventService)
zope.component.provideUtility(self, IDataService)
# setup daemon statistics
self._statService = StatisticsService()
self._statService.addStatistic("devices", "GAUGE")
self._statService.addStatistic("cyclePoints", "GAUGE")
self._statService.addStatistic("dataPoints", "DERIVE")
self._statService.addStatistic("runningTasks", "GAUGE")
self._statService.addStatistic("queuedTasks", "GAUGE")
self._statService.addStatistic("missedRuns", "GAUGE")
zope.component.provideUtility(self._statService, IStatisticsService)
# register the collector's own preferences object so it may be easily
# retrieved by factories, tasks, etc.
zope.component.provideUtility(self.preferences, ICollectorPreferences,
self.preferences.collectorName)
super(CollectorDaemon,
self).__init__(name=self.preferences.collectorName)
self._deviceGuids = {}
self._devices = set()
self._thresholds = Thresholds()
self._unresponsiveDevices = set()
self._rrd = None
self.reconfigureTimeout = None
# keep track of pending tasks if we're doing a single run, and not a
# continuous cycle
if not self.options.cycle:
self._completedTasks = 0
self._pendingTasks = []
frameworkFactory = zope.component.queryUtility(
IFrameworkFactory, self._frameworkFactoryName)
self._configProxy = frameworkFactory.getConfigurationProxy()
self._scheduler = frameworkFactory.getScheduler()
self._scheduler.maxTasks = self.options.maxTasks
self._ConfigurationLoaderTask = frameworkFactory.getConfigurationLoaderTask(
)
# OLD - set the initialServices attribute so that the PBDaemon class
# will load all of the remote services we need.
self.initialServices = PBDaemon.initialServices +\
[self.preferences.configurationService]
# trap SIGUSR2 so that we can display detailed statistics
signal.signal(signal.SIGUSR2, self._signalHandler)
# let the configuration do any additional startup it might need
self.preferences.postStartup()
self.addedPostStartupTasks = False
def buildOptions(self):
"""
Method called by CmdBase.__init__ to build all of the possible
command-line options for this collector daemon.
"""
super(CollectorDaemon, self).buildOptions()
maxTasks = getattr(self.preferences, 'maxTasks', None)
defaultMax = maxTasks if maxTasks else 500
self.parser.add_option(
'--maxparallel',
dest='maxTasks',
type='int',
default=defaultMax,
help='Max number of tasks to run at once, default %default')
self.parser.add_option(
'--logTaskStats',
dest='logTaskStats',
type='int',
default=0,
help=
'How often to logs statistics of current tasks, value in seconds; very verbose'
)
self.parser.add_option(
'--redis-url',
default='redis://localhost:16379/0',
help=
'redis connection string: redis://[hostname]:[port]/[db], default: %default'
)
frameworkFactory = zope.component.queryUtility(
IFrameworkFactory, self._frameworkFactoryName)
if hasattr(frameworkFactory, 'getFrameworkBuildOptions'):
# During upgrades we'll be missing this option
self._frameworkBuildOptions = frameworkFactory.getFrameworkBuildOptions(
)
if self._frameworkBuildOptions:
self._frameworkBuildOptions(self.parser)
# give the collector configuration a chance to add options, too
self.preferences.buildOptions(self.parser)
def parseOptions(self):
super(CollectorDaemon, self).parseOptions()
self.preferences.options = self.options
def connected(self):
"""
Method called by PBDaemon after a connection to ZenHub is established.
"""
return self._startup()
def _getInitializationCallback(self):
def doNothing():
pass
if self._initializationCallback is not None:
return self._initializationCallback
else:
return doNothing
def connectTimeout(self):
super(CollectorDaemon, self).connectTimeout()
return self._startup()
def _startup(self):
d = defer.maybeDeferred(self._getInitializationCallback())
d.addCallback(self._startConfigCycle)
d.addCallback(self._startMaintenance)
d.addErrback(self._errorStop)
return d
def watchdogCycleTime(self):
"""
Return our cycle time (in minutes)
@return: cycle time
@rtype: integer
"""
return self.preferences.cycleInterval * 2
def getRemoteConfigServiceProxy(self):
"""
Called to retrieve the remote configuration service proxy object.
"""
return self.services.get(self.preferences.configurationService,
FakeRemote())
def generateEvent(self, event, **kw):
eventCopy = super(CollectorDaemon, self).generateEvent(event, **kw)
if eventCopy.get("device"):
device_id = eventCopy.get("device")
guid = self._deviceGuids.get(device_id)
if guid:
eventCopy['device_guid'] = guid
return eventCopy
def writeRRD(self,
path,
value,
rrdType,
rrdCommand=None,
cycleTime=None,
min='U',
max='U',
threshEventData={},
timestamp='N',
allowStaleDatapoint=True):
now = time.time()
hasThresholds = bool(self._thresholds.byFilename.get(path))
if hasThresholds:
rrd_write_fn = self._rrd.save
else:
rrd_write_fn = self._rrd.put
# save the raw data directly to the RRD files
value = rrd_write_fn(
path,
value,
rrdType,
rrdCommand,
cycleTime,
min,
max,
timestamp=timestamp,
allowStaleDatapoint=allowStaleDatapoint,
)
# check for threshold breaches and send events when needed
if hasThresholds:
if 'eventKey' in threshEventData:
eventKeyPrefix = [threshEventData['eventKey']]
else:
eventKeyPrefix = [path.rsplit('/')[-1]]
for ev in self._thresholds.check(path, now, value):
parts = eventKeyPrefix[:]
if 'eventKey' in ev:
parts.append(ev['eventKey'])
ev['eventKey'] = '|'.join(parts)
# add any additional values for this threshold
# (only update if key is not in event, or if
# the event's value is blank or None)
for key, value in threshEventData.items():
if ev.get(key, None) in ('', None):
ev[key] = value
self.sendEvent(ev)
def readRRD(self, path, consolidationFunction, start, end):
return RRDUtil.read(path, consolidationFunction, start, end)
def stop(self, ignored=""):
if self._stoppingCallback is not None:
try:
self._stoppingCallback()
except Exception:
self.log.exception('Exception while stopping daemon')
super(CollectorDaemon, self).stop(ignored)
def remote_deleteDevice(self, devId):
"""
Called remotely by ZenHub when a device we're monitoring is deleted.
"""
# guard against parsing updates during a disconnect
if devId is None:
return
self._deleteDevice(devId)
def remote_deleteDevices(self, deviceIds):
"""
Called remotely by ZenHub when devices we're monitoring are deleted.
"""
# guard against parsing updates during a disconnect
if deviceIds is None:
return
for devId in Zipper.load(deviceIds):
self._deleteDevice(devId)
def remote_updateDeviceConfig(self, config):
"""
Called remotely by ZenHub when asynchronous configuration updates occur.
"""
# guard against parsing updates during a disconnect
if config is None:
return
self.log.debug("Device %s updated", config.configId)
if not self.options.device or self.options.device in (config.id,
config.configId):
self._updateConfig(config)
self._configProxy.updateConfigProxy(self.preferences, config)
def remote_updateDeviceConfigs(self, configs):
"""
Called remotely by ZenHub when asynchronous configuration updates occur.
"""
if configs is None:
return
for config in Zipper.load(configs):
self.remote_updateDeviceConfig(config)
def remote_notifyConfigChanged(self):
"""
Called from zenhub to notify that the entire config should be updated
"""
if self.reconfigureTimeout and self.reconfigureTimeout.active():
# We will run along with the already scheduled task
self.log.debug("notifyConfigChanged - using existing call")
return
self.log.debug("notifyConfigChanged - scheduling call in 30 seconds")
self.reconfigureTimeout = reactor.callLater(30, self._rebuildConfig)
def _rebuildConfig(self):
"""
Delete and re-add the configuration tasks to completely re-build the configuration.
"""
if self.reconfigureTimeout and not self.reconfigureTimeout.active():
self.reconfigureTimeout = None
self._scheduler.removeTasksForConfig(CONFIG_LOADER_NAME)
self._startConfigCycle()
def _rescheduleConfig(self, observable, attrName, oldValue, newValue,
**kwargs):
"""
Delete and re-add the configuration tasks to start on new interval.
"""
if oldValue != newValue:
self.log.debug(
"Changing config task interval from %s to %s minutes" %
(oldValue, newValue))
self._scheduler.removeTasksForConfig(CONFIG_LOADER_NAME)
#values are in minutes, scheduler takes seconds
self._startConfigCycle(startDelay=newValue * 60)
def _taskCompleteCallback(self, taskName):
# if we're not running a normal daemon cycle then we need to shutdown
# once all of our pending tasks have completed
if not self.options.cycle:
try:
self._pendingTasks.remove(taskName)
except ValueError:
pass
self._completedTasks += 1
# if all pending tasks have been completed then shutdown the daemon
if len(self._pendingTasks) == 0:
self._displayStatistics()
self.stop()
def _updateConfig(self, cfg):
configId = cfg.configId
self.log.debug("Processing configuration for %s", configId)
nextExpectedRuns = {}
if configId in self._devices:
tasksToRemove = self._scheduler.getTasksForConfig(configId)
nextExpectedRuns = {
taskToRemove.name:
self._scheduler.getNextExpectedRun(taskToRemove.name)
for taskToRemove in tasksToRemove
}
self._scheduler.removeTasks(task.name for task in tasksToRemove)
self._configListener.updated(cfg)
else:
self._devices.add(configId)
self._configListener.added(cfg)
newTasks = self._taskSplitter.splitConfiguration([cfg])
self.log.debug("Tasks for config %s: %s", configId, newTasks)
nowTime = time.time()
for (taskName, task_) in newTasks.iteritems():
#if not cycling run the task immediately otherwise let the scheduler
#decide when to run the task
now = not self.options.cycle
nextExpectedRun = nextExpectedRuns.get(taskName, None)
if nextExpectedRun:
startDelay = nextExpectedRun - nowTime
if startDelay <= 0:
# handle edge case where we are about to run
# so run immediately
now = True
task_.startDelay = 0
else:
task_.startDelay = startDelay
self._scheduler.addTask(task_, self._taskCompleteCallback, now)
# TODO: another hack?
if hasattr(cfg, 'thresholds'):
self._thresholds.updateForDevice(configId, cfg.thresholds)
# if we're not running a normal daemon cycle then keep track of the
# tasks we just added for this device so that we can shutdown once
# all pending tasks have completed
if not self.options.cycle:
self._pendingTasks.append(taskName)
@defer.inlineCallbacks
def _updateDeviceConfigs(self, updatedConfigs, purgeOmitted):
"""
Update the device configurations for the devices managed by this
collector.
@param deviceConfigs a list of device configurations
@type deviceConfigs list of name,value tuples
"""
self.log.debug("updateDeviceConfigs: updatedConfigs=%s",
(map(str, updatedConfigs)))
for cfg in updatedConfigs:
self._updateConfig(cfg)
# yield time to reactor so other things can happen
yield task.deferLater(reactor, 0, lambda: None)
if purgeOmitted:
self._purgeOmittedDevices(cfg.configId for cfg in updatedConfigs)
def _purgeOmittedDevices(self, updatedDevices):
"""
Delete all current devices that are omitted from the list of devices being updated.
@param updatedDevices a collection of device ids
@type updatedDevices a sequence of strings
"""
# remove tasks for the deleted devices
deletedDevices = set(self._devices) - set(updatedDevices)
self.log.debug("purgeOmittedDevices: deletedConfigs=%s",
','.join(deletedDevices))
for configId in deletedDevices:
self._deleteDevice(configId)
def _deleteDevice(self, deviceId):
self.log.debug("Device %s deleted" % deviceId)
self._devices.discard(deviceId)
self._configListener.deleted(deviceId)
self._configProxy.deleteConfigProxy(self.preferences, deviceId)
self._scheduler.removeTasksForConfig(deviceId)
def _errorStop(self, result):
"""
Twisted callback to receive fatal messages.
@param result: the Twisted failure
@type result: failure object
"""
if isinstance(result, Failure):
msg = result.getErrorMessage()
else:
msg = str(result)
self.log.critical("Unrecoverable Error: %s", msg)
self.stop()
def _startConfigCycle(self, result=None, startDelay=0):
configLoader = self._ConfigurationLoaderTask(
CONFIG_LOADER_NAME, taskConfig=self.preferences)
configLoader.startDelay = startDelay
# Don't add the config loader task if the scheduler already has
# an instance of it.
if configLoader not in self._scheduler:
# Run initial maintenance cycle as soon as possible
# TODO: should we not run maintenance if running in non-cycle mode?
self._scheduler.addTask(configLoader)
else:
self.log.info("%s already added to scheduler", configLoader.name)
return defer.succeed("Configuration loader task started")
def setPropertyItems(self, items):
"""
Override so that preferences are updated
"""
super(CollectorDaemon, self).setPropertyItems(items)
self._setCollectorPreferences(dict(items))
def _setCollectorPreferences(self, preferenceItems):
for name, value in preferenceItems.iteritems():
if not hasattr(self.preferences, name):
# TODO: make a super-low level debug mode? The following message isn't helpful
#self.log.debug("Preferences object does not have attribute %s",
# name)
setattr(self.preferences, name, value)
elif getattr(self.preferences, name) != value:
self.log.debug("Updated %s preference to %s", name, value)
setattr(self.preferences, name, value)
def _loadThresholdClasses(self, thresholdClasses):
self.log.debug("Loading classes %s", thresholdClasses)
for c in thresholdClasses:
try:
importClass(c)
except ImportError:
log.exception("Unable to import class %s", c)
def _configureRRD(self, rrdCreateCommand, thresholds):
self._rrd = RRDUtil.RRDUtil(rrdCreateCommand,
self.preferences.cycleInterval)
self.rrdStats.config(self.options.monitor, self.name, thresholds,
rrdCreateCommand)
def _isRRDConfigured(self):
return (self.rrdStats and self._rrd)
def _startMaintenance(self, ignored=None):
unused(ignored)
if not self.options.cycle:
self._maintenanceCycle()
return
if self.options.logTaskStats > 0:
log.debug("Starting Task Stat logging")
loop = task.LoopingCall(self._displayStatistics, verbose=True)
loop.start(self.options.logTaskStats, now=False)
interval = self.preferences.cycleInterval
self.log.debug("Initializing maintenance Cycle")
maintenanceCycle = MaintenanceCycle(interval, self,
self._maintenanceCycle)
maintenanceCycle.start()
def _maintenanceCycle(self, ignored=None):
"""
Perform daemon maintenance processing on a periodic schedule. Initially
called after the daemon configuration loader task is added, but afterward
will self-schedule each run.
"""
self.log.debug("Performing periodic maintenance")
def _processDeviceIssues(result):
self.log.debug("deviceIssues=%r", result)
if result is None:
return result # exception or some other problem
# Device ping issues returns as a tuple of (deviceId, count, total)
# and we just want the device id
newUnresponsiveDevices = set(i[0] for i in result)
clearedDevices = self._unresponsiveDevices.difference(
newUnresponsiveDevices)
for devId in clearedDevices:
self.log.debug("Resuming tasks for device %s", devId)
self._scheduler.resumeTasksForConfig(devId)
self._unresponsiveDevices = newUnresponsiveDevices
for devId in self._unresponsiveDevices:
self.log.debug("Pausing tasks for device %s", devId)
self._scheduler.pauseTasksForConfig(devId)
return result
def _getDeviceIssues(result):
# TODO: handle different types of device issues, such as WMI issues
d = self.getDevicePingIssues()
return d
def _postStatistics():
self._displayStatistics()
# update and post statistics if we've been configured to do so
if self._isRRDConfigured():
stat = self._statService.getStatistic("devices")
stat.value = len(self._devices)
stat = self._statService.getStatistic("cyclePoints")
stat.value = self._rrd.endCycle()
stat = self._statService.getStatistic("dataPoints")
stat.value = self._rrd.dataPoints
# Scheduler statistics
stat = self._statService.getStatistic("runningTasks")
stat.value = self._scheduler._executor.running
stat = self._statService.getStatistic("queuedTasks")
stat.value = self._scheduler._executor.queued
stat = self._statService.getStatistic("missedRuns")
stat.value = self._scheduler.missedRuns
events = self._statService.postStatistics(
self.rrdStats, self.preferences.cycleInterval)
self.sendEvents(events)
def _maintenance():
if self.options.cycle:
d = defer.maybeDeferred(_postStatistics)
if getattr(self.preferences, 'pauseUnreachableDevices', True):
d.addCallback(_getDeviceIssues)
d.addCallback(_processDeviceIssues)
else:
d = defer.succeed("No maintenance required")
return d
d = _maintenance()
return d
def runPostConfigTasks(self, result=None):
"""
Add post-startup tasks from the preferences.
This may be called with the failure code as well.
"""
if isinstance(result, Failure):
pass
elif not self.addedPostStartupTasks:
postStartupTasks = getattr(self.preferences, 'postStartupTasks',
lambda: [])
for task in postStartupTasks():
self._scheduler.addTask(task, now=True)
self.addedPostStartupTasks = True
def _displayStatistics(self, verbose=False):
if self._rrd:
self.log.info("%d devices processed (%d datapoints)",
len(self._devices), self._rrd.dataPoints)
else:
self.log.info("%d devices processed (0 datapoints)",
len(self._devices))
self._scheduler.displayStatistics(verbose)
def _signalHandler(self, signum, frame):
self._displayStatistics(True)