count_ips_nginx

#!/usr/bin/env python3

from collections import Counter
import gzip
import glob
import sys
from os.path import join

def get_ips(file):
    if file.endswith('.gz'):
        opener = gzip.open
    else:
        opener = open
    with opener(file, 'rt') as fd:
        text = fd.read()
    return Counter(line.split()[0] for line in text.splitlines())

def all_ips(pattern):
    counter = Counter()
    for file in glob.glob(pattern):
        counter += get_ips(file)
    return counter

if __name__ == '__main__':
    if len(sys.argv) != 2:
        print(sys.argv[0], "'access-log-pattern'")
        sys.exit(1)
    counter = all_ips(join('/var/log/nginx/', sys.argv[1]))
    fmt = 'IP: {:40s} N: {}'
    for ip, n in counter.most_common(10):
        print(fmt.format(ip, n))