send an email alert when a port is down using python3

send-alert-if-sensu-docker-is-down

#!/bin/python3

import smtplib, ssl, socket
from email.mime.text import MIMEText
port = 465  # For SSL

msg = MIMEText('Sensu is Down!. Please do the needful')
msg['Subject'] = 'Sensu is down!'
msg['From'] = '[email protected]'
msg['To'] = '[email protected]'

smtp_server = "smtp.gmail.com"
sender_email = "[email protected]" 
receiver_email = "[email protected]" 
password = "utkvftkarcakxrwj"

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
result = sock.connect_ex(('127.0.0.1',3000))
# where 3000 is the port to be monitored


def send_email():
        print ("sending email")

        context = ssl.create_default_context()
        with smtplib.SMTP_SSL(smtp_server, port, context=context) as server:
                server.login(sender_email, password)
                server.sendmail(sender_email, receiver_email, msg.as_string())


if result == 0:
   print ("Port is open")
else:
   print ("Port is not open")
   send_email()
sock.close()

# add a crontab 
# * * * * * /bin/python3 /usr/src/send-alert-if-sensu-docker-is-down.py > /usr/src/cron-sensu.log