app.py

from flask import Flask
import time
import os
import redis
from telegram import Bot

r = redis.from_url(os.environ.get("REDIS_URL"))
telegram = Bot(os.environ.get("TELEGRAM_BOT_TOKEN"))

app = Flask(__name__)

@app.route('/')
def homepage():
    now = int(time.time())
    previous_connection = r.get('connection_time')
    r.set('connection_time', now)
    if not previous_connection:
        return ""

    if not r.get('is_connected'):
        telegram.send_message(os.environ.get("TELEGRAM_USER_ID"), "Connected after {} seconds".format(now - int(previous_connection)))
        r.set('is_connected', 'connected')
    
    return ""

if __name__ == '__main__':
    app.run(debug=True, use_reloader=True)