import popen2
import re
import smtplib
#from SMSRomandie import * # see http://seriot.ch/SMSRomandie

SMTP_SERVER = 'smtp.example.net'
SMTP_USER = 'username'
SMTP_PASS = 'password'

def mail(sender, to, subject, text):
    headers = "From: %s\r\nTo: %s\r\nSubject: %s\r\n\r\n" % (sender, to, subject)
    message = headers + text
    session = smtplib.SMTP(SMTP_SERVER)
    session.login(SMTP_USER, SMTP_PASS)
    result = session.sendmail(sender, to, message)
    session.quit()
    
    return result == {} # no error

def can_ping(host):
    ping_status = False
    
    try:
        (stdout, stdin, stderr) = popen2.popen3("/sbin/ping -q -c2 " + host)
        ping_stats = stdout.readlines()[3].rstrip()
        p = re.compile("\d+ packets transmitted, \d+ packets received, (\d+)% packet loss")
        packets_lost = int(re.findall(p, ping_stats)[0])
        ping_status = packets_lost == 0
    except:
        pass
    
    return ping_status

host = 'macmini.local'

if not can_ping(host):
    email_was_sent = mail("from@example.net", 'to@example.net', "Message from ping bot", "Can't ping %s." % host)
    print "email_was_sent:", email_was_sent

    #sms_was_sent = SMSRomandie().send('+41781234567', "ping bot can't ping %s" % host)
    #print "sms_was_sent:", sms_was_sent