Create Alarm Clocker Using Python And SystemD

#devops #systemd #python #slackbot

⚛️ 📄 🚀

Python For Fun

Make alarm clocker by using combine of systemD, python, and slackbot

Create SystemD service

The service will start along with your machine and running background process to check clocker

⚡ $ cat Clocker.service 
[Unit]
Description=Polling check clocker alarm
Requires=network.target
After=multi-user.target

[Service]
Type=forking
PIDFile=/var/run/clocker_polling.pid
ExecStart=/opt/ops/clocker_polling.sh

StandardOutput=/var/log/clocker-alarm.log
StandardError=/var/log/clocker-alarm.error

Restart=on-failure
RestartSec=5s

[Install]
WantedBy=multi-user.target

Create wrapper script to start service

⚡ $ cat /opt/ops/clocker_polling.sh 
#!/bin/bash
rm -f /var/run/clocker_polling.pid
python3 /opt/ops/clocker.py &
echo $! > /var/run/clocker_polling.pid

⚡ $ sudo chmod +x /opt/ops/clocker_polling.sh

Python script to run process

⚡ $ cat /opt/ops/clocker.py 
import os
import requests
import time
from datetime import datetime
import json


class SlackWebHook:
    """ Send payload to slack """
    def __init__(self):
        self.webhook_url = 'https://hooks.slack.com/services/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'
        self.footer_icon = 'https://cdn2.iconfinder.com/data/icons/construction-2-15/65/65-512.png'
        self.slack_id = 'UU1111UU'

    def send_slack(self, msg):
        """ Send alarm to slack """
        color = '#750202'
        level = ':boom: ALERT :boom:'
        curr_time = datetime.now().strftime('%Y-%m-%d %H:%M:%S')

        message = f"<@{self.slack_id}> {msg}"
        slack_payload = {"username": "Hurry-up",
                         "attachments": [{"fallback": "Required plain-text summary of the attachment.",
                                          "pretext": level,
                                          "color": color,
                                          "text": message,
                                          "footer": curr_time,
                                          "footer_icon": self.footer_icon}]}
        requests.post(self.webhook_url, data=json.dumps(slack_payload), headers={'Content-Type': 'application/json'})


if __name__ == '__main__':
    while 1:
        now = datetime.now()
        if now.hour == 23 and now.minute == 3:
            slack = SlackWebHook()
            slack.send_slack("*Report to the boss now!!!*")
            time.sleep(5)
        else:
            time.sleep(15)

Start systemD service

⚡ $ sudo cp Clocker.service /lib/systemd/system/
⚡ $ systemctl start Clocker.service
⚡ $ systemctl status Clocker.service
● Clocker.service - Polling check clocker alarm
     Loaded: loaded (/lib/systemd/system/Clocker.service; enabled; vendor preset: enabled)
     Active: active (running) since Sun 2020-12-27 22:04:31 +07; 57min ago
    Process: 99372 ExecStart=/opt/ops/clocker_polling.sh (code=exited, status=0/SUCCESS)
   Main PID: 99379 (python3)
      Tasks: 1 (limit: 18998)
     Memory: 16.9M
     CGroup: /system.slice/Clocker.service
             └─99379 python3 /opt/ops/clocker.py

Dec 27 22:04:31 jackdao systemd[1]: Starting Polling check clocker alarm...
Dec 27 22:04:31 jackdao systemd[1]: Started Polling check clocker alarm.