#!/bin/bash
#This script monitors server load and memory usage for every 10 seconds and sends notification to telegram in case of high usage.

#Include telegram chat id and bot token ID here
chat_id="480631913"
token="918463820:AAECzo6XYA1jVLxnYs-0qctWdzHQyhXT628"

#Temporary files to store data
resource_usage_info=/tmp/resource_usage_info.txt
msg_caption=/tmp/telegram_msg_caption.txt

#Set threshold levels for memory usage and load here. If the usage exceeds these values, the notification will be sent.
mem_threshold=90 #Should be interger. This is in percentage
load_threshold=$(nproc) #Should be integer. Usually total number of cores.

#Telegram API to send notificaiton.
function telegram_send
{
curl -s -F chat_id=$chat_id -F document=@$resource_usage_info -F caption="$caption" https://api.telegram.org/bot$token/sendDocument > /dev/null 2&>1
}

#Monitoring Load on the server
while :
do
    min_load=$(cat /var/log/snort/alert | egrep -wi --color 'Ada|Serangan|ping')
    if [ $min_load -ge $load_threshold ]
        then
        echo -e "High CPU usage detected on $(hostname)\n$(uptime)" > $msg_caption
        echo -e '\E[32m'"ADA SERANGAN :" $tecreset $min_load | sed '1d' | sort -nr >> $resource_usage_info
        caption=$(<$msg_caption)
        telegram_send
        rm -f $resource_usage_info
        rm -f $msg_caption
        sleep 900 #stop executing script for 15 minutes
    fi
    sleep 10
done