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Parsing improvements

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This commit is contained in:
Stefan Reimer 2019-06-24 16:14:40 +00:00
parent 5b3e04566b
commit b26205658e
2 changed files with 18 additions and 7 deletions
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5
CHANGES.md
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@ -1,5 +1,10 @@
# Changelog
## 0.9.3
- improved parsing of timestamps incl. subsecond resolution
- improved parsing of Lambda events to catch RequestIds
- skip over empty cloudwatch log events
## 0.9.2
- fixed parser for multi line Lambda events

18
index.py
View File

@ -17,7 +17,7 @@ import boto3
__author__ = "Stefan Reimer"
__author_email__ = "stefan@zero-downtime.net"
__version__ = "0.9.2"
__version__ = "0.9.3"
# Global alias lookup cache
account_aliases = {}
@ -195,6 +195,11 @@ def handler(event, context):
source = get_source(region, account_id)
parsed = {}
# Remove whitespace / empty events & skip over empty events
e['message'] = e['message'].strip()
if re.match(r'^\s*$', e['message']):
continue
# inject existing data from subscrition filters
if('extractedFields' in e.keys()):
for key in e['extractedFields']:
@ -202,7 +207,6 @@ def handler(event, context):
# lambda ?
if logs.tag == 'aws.lambda':
# First look for the three AWS Lambda entries
mg = re.match(r'(?P<type>(START|END|REPORT)) RequestId: (?P<request>\S*)', e['message'])
if mg:
@ -228,10 +232,12 @@ def handler(event, context):
# This normalizes print vs. logging entries and allows requestid tracking
# "[%(levelname)s]\t%(asctime)s.%(msecs)dZ\t%(aws_request_id)s\t%(message)s\n"
_msg = e['message']
pattern = r'(?:\[(?P<level>[^\]]*)\])\t(?P<time>.*?)\t(?P<RequestId>\S*?)\t(?P<message>.*)'
pattern = r'(?:\[(?P<level>[^\]]*)\]\s)?(?P<time>\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d{1,6}Z)\s(?P<RequestId>\S*?)\s(?P<message>.*)'
data = re.match(pattern, e['message'], flags=re.DOTALL)
if data:
if data.group('level'):
event['level'] = data.group('level')
event['time'] = fluentd_time(datetime.datetime.strptime(data.group('time'), '%Y-%m-%dT%H:%M:%S.%fZ').timestamp())
parsed['RequestId'] = data.group('RequestId')
_msg = data.group('message')
@ -252,7 +258,7 @@ def handler(event, context):
parsed = json.loads(e['message'])
# use eventTime and eventID from the event itself
event['time'] = fluentd_time(time.mktime(datetime.datetime.strptime(parsed['eventTime'], '%Y-%m-%dT%H:%M:%SZ').timetuple()))
event['time'] = fluentd_time(datetime.datetime.strptime(parsed['eventTime'], '%Y-%m-%dT%H:%M:%SZ').timestamp())
event['id'] = parsed['eventID']
# override region from cloudtrail event
source['region'] = parsed['awsRegion']
@ -338,7 +344,7 @@ def handler(event, context):
row = line.split('\t')
# cloudfront events are logged to the second only, date and time are seperate
event['time'] = fluentd_time(time.mktime(datetime.datetime.strptime(row[0] + " " + row[1], '%Y-%m-%d %H:%M:%S').timetuple()))
event['time'] = fluentd_time(datetime.datetime.strptime(row[0] + " " + row[1], '%Y-%m-%d %H:%M:%S').timestamp())
for n, c in enumerate(columns, 2):
value = row[n]
@ -378,7 +384,7 @@ def handler(event, context):
logger.warning("Could not parse ALB access log entry: {}".format(line))
continue
event['time'] = fluentd_time(time.mktime(datetime.datetime.strptime(parsed['request_creation_time'], '%Y-%m-%dT%H:%M:%S.%fZ').timetuple()))
event['time'] = fluentd_time(datetime.datetime.strptime(parsed['request_creation_time'], '%Y-%m-%dT%H:%M:%S.%fZ').timestamp())
# Copy to host to allow geoip upstream
event['host'] = parsed['client_ip']