mn_alert_out_of_sync

#!/usr/bin/env bash
# Send an a Telegram Alert when a Bolivarcoin Masternode is "Out of Sync"
#
# Author:
# Asdrúbal R. Velásquez 
# Telegram: @Visionario
#
# Version: 1.1
# Date: 2019/12/30
#
# License: MIT
# Prerequisites:
# curl installed
#
# You have Bolivarcoin masternodes datadir installed like this (and running)
# /home/YourUser/.MN1
# /home/YourUser/.MN2
# /home/YourUser/.MN3
# ...
# /home/YourUser/.MN10
#
#
# NOTES: Create a cron line with this script every 15 Minutes
# Insert here your Bot Token (generated from @BotFather)
TOKEN="YOUR-BOT-TOKEN-HERE"

# chat_id for your group, channel or user to receive alerts
CHAT_ID=

TG_URL="https://api.telegram.org/bot${TOKEN}/sendMessage"
MN_DATA_ROOT=$(echo $HOME/)
URL_GETBLOCKCOUNT="https://chainz.cryptoid.info/boli/api.dws?q=getblockcount"

# Sometimes external explorers doesn't refresh data inmediately
# It is necessary a threshold between blocks
# THRESHOLD=10 for Bolivarcoin BOLI is good
THRESHOLD=10

# Read lastblock from external blockchain explorer
lastblock=$(curl ${URL_GETBLOCKCOUNT})

echo "Checking MN sync for block: ${lastblock}"

# Put here how many MN you hold
# It assume you have /home/user/.MN## where ## is MN value 
# If you have 50 MN then you must have folder like:
# /home/user/.MN1
# /home/user/.MN2
# /home/user/.MN3
# ...
# /home/user/.MN50
# Then --> for i in {1..50}
for i in {1..50}
do
    # get Blockcount from MN(i)
    j=$(bolivarcoin-cli --datadir="${MN_DATA_ROOT}.MN${i}/" getblockcount)

    # Absolute threshold difference
    absdiff=$((lastblock - j))
    absdiff=${absdiff#-}
    send_alert=$(($absdiff > $THRESHOLD))
    #echo -e "Checking for masternode ${i}"

    if [ "$send_alert" -eq "1" ]
    then
        echo "Masternode: MN ${i} is out of sync, sending Telegram alert"
        # Send telegram Alert
        curl -s -X POST $TG_URL -d chat_id=$CHAT_ID -d text="Error de sincronización en Masternodo MN ${i}:%0ABloque actual: $j%0AUltimo bloque: $lastblock " > /dev/null 2>&1
    else
        echo "Masternode: MN ${i} is OK"
    fi
done