def compare(self, event):
key = hashable(lookup_es_key(event, self.rules['query_key']))
values = []
elastalert_logger.debug(" Previous Values of compare keys " + str(self.occurrences))
for val in self.rules['compound_compare_key']:
lookup_value = lookup_es_key(event, val)
values.append(lookup_value)
elastalert_logger.debug(" Current Values of compare keys " + str(values))
changed = False
for val in values:
if not isinstance(val, bool) and not val and self.rules['ignore_null']:
return False
# If we have seen this key before, compare it to the new value
if key in self.occurrences:
for idx, previous_values in enumerate(self.occurrences[key]):
elastalert_logger.debug(" " + str(previous_values) + " " + str(values[idx]))
changed = previous_values != values[idx]
if changed:
break
if changed:
self.change_map[key] = (self.occurrences[key], values)
# If using timeframe, only return true if the time delta is < timeframe
if key in self.occurrence_time:
changed = event[self.rules['timestamp_field']] - self.occurrence_time[key] <= self.rules['timeframe']
# Update the current value and time
elastalert_logger.debug(" Setting current value of compare keys values " + str(values))
self.occurrences[key] = values
if 'timeframe' in self.rules:
self.occurrence_time[key] = event[self.rules['timestamp_field']]
elastalert_logger.debug("Final result of comparision between previous and current values " + str(changed))
return changed
def compare(self, event):
key = hashable(lookup_es_key(event, self.rules['query_key']))
values = []
elastalert_logger.debug(" Previous Values of compare keys " + str(self.occurrences))
for val in self.rules['compound_compare_key']:
lookup_value = lookup_es_key(event, val)
values.append(lookup_value)
elastalert_logger.debug(" Current Values of compare keys " + str(values))
changed = False
for val in values:
if not isinstance(val, bool) and not val and self.rules['ignore_null']:
return False
# If we have seen this key before, compare it to the new value
if key in self.occurrences:
for idx, previous_values in enumerate(self.occurrences[key]):
elastalert_logger.debug(" " + str(previous_values) + " " + str(values[idx]))
changed = previous_values != values[idx]
if changed:
break
if changed:
self.change_map[key] = (self.occurrences[key], values)
# If using timeframe, only return true if the time delta is < timeframe
if key in self.occurrence_time:
changed = event[self.rules['timestamp_field']] - self.occurrence_time[key] <= self.rules['timeframe']
# Update the current value and time
elastalert_logger.debug(" Setting current value of compare keys values " + str(values))
self.occurrences[key] = values
if 'timeframe' in self.rules:
self.occurrence_time[key] = event[self.rules['timestamp_field']]
elastalert_logger.debug("Final result of comparision between previous and current values " + str(changed))
return changed
def add_match(self, match):
# TODO this is not technically correct
# if the term changes multiple times before an alert is sent
# this data will be overwritten with the most recent change
change = self.change_map.get(hashable(lookup_es_key(match, self.rules['query_key'])))
extra = {}
if change:
extra = {'old_value': change[0],
'new_value': change[1]}
elastalert_logger.debug("Description of the changed records " + str(dict(match.items() + extra.items())))
super(ChangeRule, self).add_match(dict(match.items() + extra.items()))
def add_match(self, match):
# TODO this is not technically correct
# if the term changes multiple times before an alert is sent
# this data will be overwritten with the most recent change
change = self.change_map.get(hashable(lookup_es_key(match, self.rules['query_key'])))
extra = {}
if change:
extra = {'old_value': change[0],
'new_value': change[1]}
elastalert_logger.debug("Description of the changed records " + str(dict(match.items() + extra.items())))
super(ChangeRule, self).add_match(dict(match.items() + extra.items()))
