def cloudwatch_messages(self):
"""
Try to find some CloudWatch messages that might be relevant.
"""
client = boto3.client('logs')
messages = []
try:
log_group_name = guess_cloudwatch_log_group(alarm_name=self.name)
# CloudWatch wants these parameters specified as seconds since
# 1 Jan 1970 00:00:00, so convert to that first.
timeframe = self.cloudwatch_timeframe
startTime = datetime_to_cloudwatch_ts(timeframe.start)
endTime = datetime_to_cloudwatch_ts(timeframe.end)
# We only get the first page of results. If there's more than
# one page, we have so many errors that not getting them all
# in the Slack alarm is the least of our worries!
for term in guess_cloudwatch_search_terms(alarm_name=self.name):
resp = client.filter_log_events(logGroupName=log_group_name,
startTime=startTime,
endTime=endTime,
filterPattern=term)
messages.extend([e['message'] for e in resp['events']])
except Exception as err:
print(f'Error in cloudwatch_messages: {err!r}')
return messages
def cloudwatch_urls(self):
"""
Return some CloudWatch URLs that might be useful to check.
"""
try:
log_group_name = guess_cloudwatch_log_group(alarm_name=self.name)
timeframe = self.cloudwatch_timeframe
return [
build_cloudwatch_url(search_term=search_term,
log_group_name=log_group_name,
start_date=timeframe.start,
end_date=timeframe.end)
for search_term in guess_cloudwatch_search_terms(
alarm_name=self.name)
]
except ValueError as err:
print(f'Error in cloudwatch_urls: {err}')
return []
def test_unrecognised_log_group_name_is_valueerror(bad_alarm_name):
with pytest.raises(ValueError):
guess_cloudwatch_log_group(bad_alarm_name)
def test_guess_cloudwatch_log_group(alarm_name, expected_log_group_name):
assert guess_cloudwatch_log_group(alarm_name) == expected_log_group_name