def evaluateDataSourceExpression(self, context, propName, readablePropName):
"""
Return back a sane value from evaluation of an expression.
@paramter context: device or component object
@type context: device or component object
@paramter propName: name of the threshold property to evaluate
@type propName: string
@paramter readablePropName: property name for displaying in error messages
@type readablePropName: string
@returns: numeric
@rtype: numeric
"""
value = getattr(self, propName, None)
if value:
try:
express = "python:%s" % value
evaluated = talesEval(express, context)
value = evaluated
except:
msg= "User-supplied Python expression (%s) for %s caused error: %s" % (
value, readablePropName, self.dsnames)
log.error(msg)
raise pythonThresholdException(msg)
value = None
return nanToNone(value)
def evaluateDataSourceExpression(self, context, propName, readablePropName):
"""
Return back a sane value from evaluation of an expression.
@paramter context: device or component object
@type context: device or component object
@paramter propName: name of the threshold property to evaluate
@type propName: string
@paramter readablePropName: property name for displaying in error messages
@type readablePropName: string
@returns: numeric
@rtype: numeric
"""
value = getattr(self, propName, None)
if value:
try:
express = "python:%s" % value
evaluated = talesEval(express, context)
value = evaluated
except:
msg= "User-supplied Python expression (%s) for %s caused error: %s" % (
value, readablePropName, self.dsnames)
log.error(msg)
raise pythonThresholdException(msg)
value = None
return nanToNone(value)
def getGraphValues(self, relatedGps, context):
"""
Returns the values that we want to include for the
visualization of this threshold. For a minmax we simply
display lines representing the minval and maxval.
"""
minval = self.minimum
if minval is None or minval == '':
minval = NaN
maxval = self.maximum
if maxval is None or maxval == '':
maxval = NaN
if not self.dataPointNames:
return []
gp = relatedGps[self.dataPointNames[0]]
# Attempt any RPN expressions
rpn = getattr(gp, 'rpn', None)
if rpn:
try:
rpn = talesEvalStr(rpn, context)
except Exception as e:
log.exception(e)
self.raiseRPNExc()
return []
try:
if minval is not NaN:
minval = rpneval(minval, rpn)
except Exception:
minval = 0
self.raiseRPNExc()
try:
if maxval is not NaN:
maxval = rpneval(maxval, rpn)
except Exception:
maxval = 0
self.raiseRPNExc()
minval = nanToNone(minval)
maxval = nanToNone(maxval)
return [minval, maxval]
def getMaxval(self, context):
"""Build the max value for this threshold.
"""
maxval = None
if self.maxval:
try:
express = "python:%s" % self.maxval
maxval = talesEval(express, context)
except:
msg = ("User-supplied Python expression (%s) for "
"maximum value caused error: %s") % (self.maxval,
self.dsnames)
log.error(msg)
raise pythonThresholdException(msg)
maxval = None
return nanToNone(maxval)
def getGraphElements(self, template, context, gopts, namespace, color,
legend, relatedGps):
"""Produce a visual indication on the graph of where the
threshold applies."""
unused(template, namespace)
if not color.startswith('#'):
color = '#%s' % color
minval = self.minimum
if minval is None or minval == '':
minval = NaN
maxval = self.maximum
if maxval is None or maxval == '':
maxval = NaN
if not self.dataPointNames:
return gopts
gp = relatedGps[self.dataPointNames[0]]
# Attempt any RPN expressions
rpn = getattr(gp, 'rpn', None)
if rpn:
try:
rpn = talesEvalStr(rpn, context)
except:
self.raiseRPNExc()
return gopts
try:
minval = rpneval(minval, rpn)
except:
minval= 0
self.raiseRPNExc()
try:
maxval = rpneval(maxval, rpn)
except:
maxval= 0
self.raiseRPNExc()
minstr = self.setPower(minval)
maxstr = self.setPower(maxval)
minval = nanToNone(minval)
maxval = nanToNone(maxval)
if legend:
gopts.append(
"HRULE:%s%s:%s\\j" % (minval or maxval, color, legend))
elif minval is not None and maxval is not None:
if minval == maxval:
gopts.append(
"HRULE:%s%s:%s not equal to %s\\j" % (minval, color,
self.getNames(relatedGps), minstr))
elif minval < maxval:
gopts.append(
"HRULE:%s%s:%s not within %s and %s\\j" % (minval, color,
self.getNames(relatedGps), minstr, maxstr))
gopts.append("HRULE:%s%s" % (maxval, color))
elif minval > maxval:
gopts.append(
"HRULE:%s%s:%s between %s and %s\\j" % (minval, color,
self.getNames(relatedGps), maxstr, minstr))
gopts.append("HRULE:%s%s" % (maxval, color))
elif minval is not None :
gopts.append(
"HRULE:%s%s:%s less than %s\\j" % (minval, color,
self.getNames(relatedGps), minstr))
elif maxval is not None:
gopts.append(
"HRULE:%s%s:%s greater than %s\\j" % (maxval, color,
self.getNames(relatedGps), maxstr))
return gopts
def getGraphElements(self, template, context, gopts, namespace, color,
legend, relatedGps):
"""Produce a visual indication on the graph of where the
threshold applies."""
unused(template, namespace)
if not color.startswith('#'):
color = '#%s' % color
minval = self.minimum
if minval is None:
minval = NaN
maxval = self.maximum
if maxval is None:
maxval = NaN
if not self.dataPointNames:
return gopts
gp = relatedGps[self.dataPointNames[0]]
# Attempt any RPN expressions
rpn = getattr(gp, 'rpn', None)
if rpn:
try:
rpn = talesEvalStr(rpn, context)
except:
self.raiseRPNExc()
return gopts
try:
minval = rpneval(minval, rpn)
except:
minval= 0
self.raiseRPNExc()
try:
maxval = rpneval(maxval, rpn)
except:
maxval= 0
self.raiseRPNExc()
minstr = self.setPower(minval)
maxstr = self.setPower(maxval)
minval = nanToNone(minval)
maxval = nanToNone(maxval)
if legend:
gopts.append(
"HRULE:%s%s:%s\\j" % (minval or maxval, color, legend))
elif minval is not None and maxval is not None:
if minval == maxval:
gopts.append(
"HRULE:%s%s:%s not equal to %s\\j" % (minval, color,
self.getNames(relatedGps), minstr))
elif minval < maxval:
gopts.append(
"HRULE:%s%s:%s not within %s and %s\\j" % (minval, color,
self.getNames(relatedGps), minstr, maxstr))
gopts.append("HRULE:%s%s" % (maxval, color))
elif minval > maxval:
gopts.append(
"HRULE:%s%s:%s between %s and %s\\j" % (minval, color,
self.getNames(relatedGps), maxstr, minstr))
gopts.append("HRULE:%s%s" % (maxval, color))
elif minval is not None :
gopts.append(
"HRULE:%s%s:%s less than %s\\j" % (minval, color,
self.getNames(relatedGps), minstr))
elif maxval is not None:
gopts.append(
"HRULE:%s%s:%s greater than %s\\j" % (maxval, color,
self.getNames(relatedGps), maxstr))
return gopts
class MinMaxThresholdInstance(MetricThresholdInstance):
# Not strictly necessary, but helps when restoring instances from
# pickle files that were not constructed with a count member.
count = {}
def __init__(self, id, context, dpNames,
minval, maxval, eventClass, severity, escalateCount,
eventFields={}):
MetricThresholdInstance.__init__(self, id, context, dpNames, eventClass, severity)
self.count = {}
self.minimum = minval if minval != '' else None
self.maximum = maxval if maxval != '' else None
self.escalateCount = escalateCount
self.eventFields = eventFields
def countKey(self, dp):
return ':'.join(self.context().key()) + ':' + dp
def getCount(self, dp):
countKey = self.countKey(dp)
if not countKey in self.count:
return None
return self.count[countKey]
def incrementCount(self, dp):
countKey = self.countKey(dp)
if not countKey in self.count:
self.resetCount(dp)
self.count[countKey] += 1
return self.count[countKey]
def resetCount(self, dp):
self.count[self.countKey(dp)] = 0
def checkRange(self, dp, value):
'Check the value for min/max thresholds'
log.debug("Checking %s %s against min %s and max %s",
dp, value, self.minimum, self.maximum)
if value is None:
return []
if isinstance(value, basestring):
value = float(value)
# Check the boundaries
minbounds = self.minimum is None or value >= self.minimum
maxbounds = self.maximum is None or value <= self.maximum
outbounds = None not in (self.minimum, self.maximum) and \
self.minimum > self.maximum
thresh = None
how = None
if outbounds:
if not maxbounds and not minbounds:
thresh = self.maximum
how = 'violated'
else:
if not maxbounds:
thresh = self.maximum
how = 'exceeded'
elif not minbounds:
thresh = self.minimum
how = 'not met'
if thresh is not None:
severity = self.severity
count = self.incrementCount(dp)
if self.escalateCount and count >= self.escalateCount:
severity = min(severity + 1, 5)
summary = 'threshold of %s %s: current value %f' % (
self.name(), how, float(value))
evtdict = self._create_event_dict(value, summary, severity, how)
if self.escalateCount:
evtdict['escalation_count'] = count
return self.processEvent(evtdict)
else:
summary = 'threshold of %s restored: current value %f' % (
self.name(), value)
self.resetCount(dp)
return self.processClearEvent(self._create_event_dict(value, summary, Event.Clear))
def _create_event_dict(self, current, summary, severity, how=None):
event_dict = dict(device=self.context().deviceName,
summary=summary,
eventKey=self.id,
eventClass=self.eventClass,
component=self.context().componentName,
min=self.minimum,
max=self.maximum,
current=current,
severity=severity)
deviceUrl = getattr(self.context(), "deviceUrl", None)
if deviceUrl is not None:
event_dict["zenoss.device.url"] = deviceUrl
devicePath = getattr(self.context(), "devicePath", None)
if devicePath is not None:
event_dict["zenoss.device.path"] = devicePath
if how is not None:
event_dict['how'] = how
event_dict.update(self.eventFields)
return event_dict
def processEvent(self, evt):
"""
When a threshold condition is violated, pre-process it for (possibly) nicer
formatting or more complicated logic.
@paramater evt: event
@type evt: dictionary
@rtype: list of dictionaries
"""
return [evt]
def processClearEvent(self, evt):
"""
When a threshold condition is restored, pre-process it for (possibly) nicer
formatting or more complicated logic.
@paramater evt: event
@type evt: dictionary
@rtype: list of dictionaries
"""
return [evt]
def raiseRPNExc( self ):
"""
Raise an RPN exception, taking care to log all details.
"""
msg= "The following RPN exception is from user-supplied code."
log.exception( msg )
raise rpnThresholdException(msg)
def getGraphValues(self, relatedGps, context):
"""
Returns the values that we want to include for the
visualization of this threshold. For a minmax we simply
display lines representing the minval and maxval.
"""
minval = self.minimum
if minval is None or minval == '':
minval = NaN
maxval = self.maximum
if maxval is None or maxval == '':
maxval = NaN
if not self.dataPointNames:
return []
gp = relatedGps[self.dataPointNames[0]]
# Attempt any RPN expressions
rpn = getattr(gp, 'rpn', None)
if rpn:
try:
rpn = talesEvalStr(rpn, context)
except Exception, e:
log.exception(e)
self.raiseRPNExc()
return []
try:
if minval is not NaN:
minval = rpneval(minval, rpn)
except:
minval= 0
self.raiseRPNExc()
try:
if maxval is not NaN:
maxval = rpneval(maxval, rpn)
except:
maxval= 0
self.raiseRPNExc()
minval = nanToNone(minval)
maxval = nanToNone(maxval)
return [minval, maxval]
