scrapes truman boots site for new releases

truman.py

#!/usr/bin/env python
import requests
import os
import time
import sys
import signal
from urlparse import urljoin
import re
from bs4 import BeautifulSoup
# from IPython import embed

ROOT_URL = 'http://www.trumanboot.com/'
THE_URL = 'http://www.trumanboot.com/?post_type=product'

def anything_new(links):
    all_urls = ''.join(links)
    return hash(all_urls) != -817609967207271490

def is_available():
    r = requests.get(THE_URL)
    soup = BeautifulSoup(r.content, 'html.parser')
    anchors = soup.select('li > div > h3 > a:nth-of-type(1)')
    links = map(lambda lnk: urljoin(ROOT_URL, lnk.get('href')), anchors)
    return not anything_new(links)

def send_email():
    os.system('echo "New Truman boots in stock" | mail -s "Alert" 5551234567@tmomail.net')
    os.system('echo "New Truman in stock" | mail -s "Alert" example@example.com')

def main():
    while True:
        if is_available():
            send_email()
            return 0
        else:
            time.sleep(600)

def daemonize():
    # remove process from session
    if os.fork() > 0:
        sys.exit(0)

    os.setsid()
    os.umask(0)

    if os.fork() > 0:
        sys.exit(0)

    # redirect stdin, stdout, and stderr to /dev/null
    fd = os.open('/dev/null', os.O_RDWR)
    os.dup2(fd, 0)
    os.dup2(fd, 1)
    os.dup2(fd, 2)

    # ignore SIGHUP
    signal.signal(signal.SIGHUP, signal.SIG_IGN)

    with open('truman.pid', 'w') as f:
        f.write(str(os.getpid()) + "\n")

if __name__ == '__main__':
    daemonize()
    sys.exit(main())