#!/bin/bash

service="/usr/sbin/nginx"										# INSERT the command that started the service to be monitored
bot_text="Web server running on machine \"BOB\" just stopped."	# Text that will be sent to the BOT
chat_id="123456789"												# User ID or group ID where the message will be sent
BOT_api_token="123456789:FKeioDJXXXXXXXXXXXXXXXXXXXXXXXXXXX"	# The API Token of the BOT that will deliver the message

while node=$(pgrep -f "$service") >/dev/null					# checks if service has started
do																# if YES stay here forever
	clear														# clean the terminal
	echo "DVPN node is running with PID=$node"					# and print a message
done															# if NOT
	echo -e "\n\t\tNode stopped\n"								# print messages
	echo -e "Sending Telegram message...\n"

# And send a curl request with a message to a telegram BOT
curl -s -X POST https://api.telegram.org/bot$BOT_api_token/sendMessage -d chat_id=$chat_id -d text="$bot_text"
echo