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lambda_handler.py
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import json
import urllib
import boto3
import gzip
import datetime
import time
print('Loading function')
# Fixed fields
# Please refer to https://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/AccessLogs.html
LINE_FORMAT = {
'date': 0,
'time': 1,
'edge_location': 2,
'bytes_sent': 3,
'client_ip': 4,
'http_method': 5,
#'host': 6,
'query_path': 7,
'status_code': 8,
'referer': 9,
'user_agent': 10,
'query_string': 11,
#'cookie': 12,
'edge_result_type': 13,
#'edge_request_id': 14,
'server_name': 15,
'protocol': 16,
'bytes_received': 17,
'response_time_seconds': 18,
#'forwarded_for': 19,
#'ssl_protocol': 20,
#'ssl_cipher': 21,
#'edge_response_result_type': 22,
'protocol_version': 23,
#'fle_status': 24,
#'fle_encrypted_fields': 25,
}
LOG_GROUP_NAME = 'CloudFront'
BUFFER_SIZE = 1000
RETRY_ATTEMPTS = 10
#======================================================================================================================
# Auxiliary Functions
#======================================================================================================================
def parse_log(bucket_name, key_name):
print '[parse_log] Start'
num_requests = 0
result = dict()
try:
#--------------------------------------------------------------------------------------------------------------
print "[parse_log] \tDownload file from S3"
#--------------------------------------------------------------------------------------------------------------
filename = key_name.split('/')[-1]
distribution_id = filename.split('.')[0]
local_file_path = '/tmp/' + filename
s3 = boto3.client('s3')
s3.download_file(bucket_name, key_name, local_file_path)
logs = boto3.client('logs')
stream = logs.describe_log_streams(logGroupName=LOG_GROUP_NAME, logStreamNamePrefix=distribution_id)
if not stream['logStreams']:
logs.create_log_stream(logGroupName=LOG_GROUP_NAME, logStreamName=distribution_id)
stream = logs.describe_log_streams(logGroupName=LOG_GROUP_NAME, logStreamNamePrefix=distribution_id)
stream_tocken = stream['logStreams'][0].get('uploadSequenceToken', '0')
#--------------------------------------------------------------------------------------------------------------
print "[parse_log] \tRead content of file %s" % filename
#--------------------------------------------------------------------------------------------------------------
with gzip.open(local_file_path,'r') as content:
for line in content:
try:
if line.startswith('#'):
#TODO: parse Fields: comment for field names
continue
line_data = line.split('\t')
strtime = "%s %s" % (line_data[LINE_FORMAT['date']], line_data[LINE_FORMAT['time']])
timestamp = int(
time.mktime(
datetime.datetime.strptime(strtime, "%Y-%m-%d %H:%M:%S").timetuple()) * 1000)
if timestamp not in result:
result[timestamp] = list()
message = dict()
for name in LINE_FORMAT:
if name == 'date' or name == 'time':
continue
if name == 'response_time_seconds':
message['response_time_milliseconds'] = \
int(float(line_data[LINE_FORMAT[name]]) * 1000)
else:
message[name] = line_data[LINE_FORMAT[name]]
result[timestamp].append(message)
num_requests += 1
# Send messages every 'buffer_size' messages
if num_requests % BUFFER_SIZE == 0:
print "[parse_log] \tSending log records %d - %s" % \
(num_requests - BUFFER_SIZE + 1, num_requests)
for i in xrange(RETRY_ATTEMPTS):
try:
stream_response = logs.put_log_events(
logGroupName=LOG_GROUP_NAME,
logStreamName=distribution_id,
logEvents=get_sorted_records(result),
sequenceToken=stream_tocken)
except Exception:
print "[parse_log] \tInvalid sequence tocken. Try to renew."
stream = logs.describe_log_streams(logGroupName=LOG_GROUP_NAME,
logStreamNamePrefix=distribution_id)
stream_tocken = stream['logStreams'][0].get('uploadSequenceToken', '0')
continue
stream_tocken = stream_response.get('nextSequenceToken')
break
result = dict()
continue
except Exception as e:
print ("[parse_log] \t\tError to process line: %s" % e)
return -1
print "[parse_log] \tSending log records %d - %s" % \
(num_requests - num_requests % BUFFER_SIZE + 1, num_requests)
for i in xrange(RETRY_ATTEMPTS):
try:
logs.put_log_events(
logGroupName=LOG_GROUP_NAME,
logStreamName=distribution_id,
logEvents=get_sorted_records(result),
sequenceToken=stream_tocken)
except Exception:
print "[parse_log] \tInvalid sequence tocken. Try to renew."
stream = logs.describe_log_streams(logGroupName=LOG_GROUP_NAME,
logStreamNamePrefix=distribution_id)
stream_tocken = stream['logStreams'][0].get('uploadSequenceToken', '0')
continue
break
except Exception:
print "[parse_log] \tError to read input file"
print '[parse_log] End'
return num_requests
def get_sorted_records(result):
send_buffer = list()
for key in sorted(result):
for message in result[key]:
send_buffer.append({'timestamp': key, 'message': json.dumps(message)})
return send_buffer
#======================================================================================================================
# Lambda Entry Point
#======================================================================================================================
def lambda_handler(event, context):
print '[lambda_handler] Start'
bucket_name = event['Records'][0]['s3']['bucket']['name']
key_name = urllib.unquote_plus(event['Records'][0]['s3']['object']['key']).decode('utf8')
try:
#--------------------------------------------------------------------------------------------------------------
print "[lambda_handler] \tReading input data and parse logs"
#--------------------------------------------------------------------------------------------------------------
num_requests = parse_log(bucket_name, key_name)
except Exception as e:
raise e
print '[main] End'
return num_requests
# Test Input
event = {
'Records': [
{
's3': {
'bucket': {
'name': '<BUCKETNAME>'
},
'object': {
'key': '<FILENAME>'
}
}
}
]
}
if __name__ == '__main__':
lambda_handler(event, None)