Gunicorn Slayer

gunicorn-slayer.py

from sys import argv
from time import time
from glob import glob
from os import stat, kill, getuid
from os.path import basename, dirname, join
from datetime import datetime
from random import choice
from signal import SIGTERM

if __name__ == '__main__':

    min_age = int(argv[1])
    process_ids = []

    for proccmd in glob('/proc/*/cmdline'):
        procdir = dirname(proccmd)
        command = open(proccmd).read().split('\x00')
        age = time() - stat(procdir).st_ctime
        uid = stat(procdir).st_uid

        if age < min_age:
            # not old enough
            continue

        if uid != getuid():
            # owned by some other user
            continue

        if '/usr/local/bin/gunicorn' not in command:
            # does not appear to be a gunicorn process
            continue

        pid = int(basename(procdir))
        process_ids.append(pid)

    if process_ids:
        pid = choice(process_ids)
        print 'Killing', pid, datetime.now()
        kill(pid, SIGTERM)