Auto restart Service any time it crashes.

guard.py

#!/usr/bin/python
#coding=gbk
################################################################################
# guard.py
#
# Auto restart Service any time it crashes.
# If the Servers is manually shut down, this script will terminate.
#
# usage:./guard.py scene
################################################################################
import os
import sys
import smtplib
import email.mime.text
import time

HOST = 'smtp.gmail.com'
PORT = 25

def sendEmailReport():
    mail_username='hack4cn@gmail.com'
    mail_password='YOURPASSWD'
    from_addr = mail_username
    to_addrs=('hack4cn@gmail.com')

    smtp = smtplib.SMTP()
    print 'connecting ...'

    try:
        print smtp.connect(HOST,PORT)
    except:
        print 'CONNECT ERROR ****'
    smtp.starttls()
    try:
        print 'loginning ...'
        smtp.login(mail_username,mail_password)
    except:
        print 'LOGIN ERROR ****'
    msg = email.mime.text.MIMEText('傲视苍穹服务器于今天{0}:{1}:{2}发生一次宕机，请紧张一下！'.format(*time.localtime()[3:6]))
    msg['From'] = from_addr
    msg['To'] = ';'.join(to_addrs)
    msg['Subject']='5555555555555555555555555'
    smtp.sendmail(from_addr,to_addrs,msg.as_string())
    smtp.quit()

def collectCoreFiles():
    if not os.path.exists('core'):
        return
    os.system("tar czvf ../core/core.tgz core")
    os.unlink("core")
    os.chdir("../core")
    os.system("boar ci")
    os.chdir("../bin")

def main():
    restart_delay = 5
    if len(sys.argv) != 2:
        print "Usage: ./guard.py server"
        sys.exit(0)
    cmd = str(sys.argv[1])
    while True:
        status = os.system("nohup %s" % cmd)
        
        if status == 0:
            break
        else:
            time.sleep(restart_delay)
            collectCoreFiles()           
            sendEmailReport()

if __name__ == "__main__":
    sys.exit(main())