Python nginx Log Parser

parser.py

#!/usr/bin/env python
import gzip
import os
import sys
import re

INPUT_DIR = "nginx-logs"

lineformat = re.compile(r"""(?P<ipaddress>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}) - - \[(?P<dateandtime>\d{2}\/[a-z]{3}\/\d{4}:\d{2}:\d{2}:\d{2} (\+|\-)\d{4})\] ((\"(GET|POST) )(?P<url>.+)(http\/1\.1")) (?P<statuscode>\d{3}) (?P<bytessent>\d+) (["](?P<refferer>(\-)|(.+))["]) (["](?P<useragent>.+)["])""", re.IGNORECASE)

for f in os.listdir(INPUT_DIR):
    if f.endswith(".gz"):
        logfile = gzip.open(os.path.join(INPUT_DIR, f))
    else:
        logfile = open(os.path.join(INPUT_DIR, f))

    for l in logfile.readlines():
        data = re.search(lineformat, l)
        if data:
            datadict = data.groupdict()
            ip = datadict["ipaddress"]
            datetimestring = datadict["dateandtime"]
            url = datadict["url"]
            bytessent = datadict["bytessent"]
            referrer = datadict["refferer"]
            useragent = datadict["useragent"]
            status = datadict["statuscode"]
            method = data.group(6)

            print ip, \
              datetimestring, \
              url, \
              bytessent, \
              referrer, \
              useragent, \
              status, \
              method

    logfile.close()

    lineformat = re.compile(r"""(?P<ipaddress>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}) - - \[(?P<dateandtime>\d{2}\/[a-z]{3}\/\d{4}:\d{2}:\d{2}:\d{2} (\+|\-)\d{4})\] ((\"(GET|POST|HEAD|PUT|DELETE) )(?P<url>.+)(http\/(1\.1|2\.0)")) (?P<statuscode>\d{3}) (?P<bytessent>\d+) (?P<refferer>-|"([^"]+)") (["](?P<useragent>[^"]+)["])""", re.IGNORECASE)

from @mohit6522 i have also added :

• more HTTP Verbs
• HTTP 2.0

It should increase match rate.

lineformat = re.compile(
    r"""(?P<ipaddress>\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}|(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))) - - \[(?P<dateandtime>\d{2}\/[a-z]{3}\/\d{4}:\d{2}:\d{2}:\d{2} (\+|\-)\d{4})\] ((\"(GET|POST|HEAD|PUT|DELETE) )(?P<url>.+)(http\/(1\.1|2\.0)")) (?P<statuscode>\d{3}) (?P<bytessent>\d+) (?P<refferer>-|"([^"]+)") (["](?P<useragent>[^"]+)["])""",
    re.IGNORECASE,
)

Added ipv6 matching.

check this one!
log_format = r'(?P<remote_addr>\d+.\d+.\d+.\d+)\s+\S+\s+\S+\s+[(?P[^\]]+)]\s+"(?P[^"]+)"\s+(?P\d+)\s+(?P<bytes_sent>\d+)\s+"(?P[^"]+)+"\s+"(?P<user_agent>(?!http)[^"]*)"'

check my project on github https://github.com/ksn-developer/logbrain.git