openethereum-monitor.sh

#!/bin/bash
  
_blockDiff() {
        local_hex=$(curl -s -X POST -H "Content-Type: application/json"  --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":83}' 0.0.0.0:8545 | jq -r '.result')
        local=$(echo "ibase=16; ${local_hex^^}" | bc)

        remote_hex=$(curl -s -X POST -H "Content-Type: application/json"  --data '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":83}' https://mainnet.infura.io/v3/[INSERT_KEY] | jq -r '.result')
        remote=$(echo "ibase=16; ${remote_hex^^}" | bc)

        diff=$(($remote-$local))

        echo "$diff"
}

_restartNode() {
  echo "restarting..."
	systemctl restart openethereum
	sleep 5m
}

errorCount=0

while true
do
                
        blockDiff=$(_blockDiff)
        if [ -z "$blockDiff" ]
        then
        	# error occured
                errorCount=$((errorCount+1))
                echo "error"

                if [ $errorCount -gt 5 ]
                then
                        errorCount=0
                        _restartNode
                fi

        else
		echo "blockDiff: $blockDiff"

		if [ "$blockDiff" -gt 40 ]
		then
	                errorCount=0
	               _restartNode
	        fi
        fi
        
        sleep 60
done