update-electrum-banner

#!/bin/bash

# update electrumx banner to report bitcoin memory pool, fees, height and time since last block
# activate with cron job similar to this
#*/2 * * * *  ~/bin/update-electrumx-banner

# specify your bitcoin-cli location
BITCOIN_CLI=/usr/local/bin/bitcoin-cli

# specify your bitcoin data directory
#BITCOIN_DATADIR=/home/bitcoin/.bitcoin

# specify the location of your electrumx banner file
# note: uses %{BANNER}.template as the template (top portion) of each banner update
BANNER=/home/electrumx/.electrumx/banner

# save initial banner as template for creation of new banners
if [ ! -f ${BANNER}.template ]; then
	cp ${BANNER} ${BANNER}.template
fi

# create new banner from template
cp ${BANNER}.template ${BANNER}.new

# mempool
#MEMPOOL=`${BITCOIN_CLI} -datadir=${BITCOIN_DATADIR} getmempoolinfo | grep size | grep -o '[0-9\.]*'`
MEMPOOL=`${BITCOIN_CLI} getmempoolinfo | grep size | grep -o '[0-9\.]*'`

# report last block and current height from electrumx journal
TFILE=/home/electrumx/.electrumx/tmp/btcfees-$$
journalctl --since "6 hours ago" -u electrumx -o short-iso --utc | grep Prefetcher:new | tail -n 1 > ${TFILE}
if [ `wc -c < ${TFILE}` -gt 10 ]; then
	block_height=`< ${TFILE} awk '{print $7}'`
	block_time=`< ${TFILE} awk '{print $1}'`
	block_utime=`date -ud $block_time +'%s'`
	now_utime=`date +'%s'`
	minutes_ago=`echo ${now_utime} ${block_utime} | awk '{print int(($1-$2)/6)/10}'`
fi
rm ${TFILE}

# Header info
echo "_______________________________________________________________________________________________" >> ${BANNER}.new
echo "___" >> ${BANNER}.new
printf "___  $(date +%d.%m.%Y' '%H:%M)  /  Last Block: ${block_height} (${minutes_ago} mins ago)  /  Mem Pool: ${MEMPOOL}  /\n" >> ${BANNER}.new
echo "____________________________________________________________________________________________" >> ${BANNER}.new
echo "___" >> ${BANNER}.new

# get exchange rate and average fee per satoshi
if ${BITCOIN_CLI} --version | grep -q ABC; then
        USDPERBTC=`curl -m 10 -L -s 'https://apiv2.bitcoinaverage.com/indices/global/ticker/BCHUSD' | python3 -c 'import sys, json; j=json.load(sys.stdin); print(j["last"])'`
        EURPERBTC=`curl -m 10 -L -s 'https://apiv2.bitcoinaverage.com/indices/global/ticker/BCHEUR' | python3 -c 'import sys, json; j=json.load(sys.stdin); print(j["last"])'`
        CHFPERBTC=`curl -m 10 -L -s 'https://apiv2.bitcoinaverage.com/indices/global/ticker/BCHCHF' | python3 -c 'import sys, json; j=json.load(sys.stdin); print(j["last"])'`
        TICKER=BCH
		BYTESPERTX=226
else
        USDPERBTC=`curl -m 10 -L -s 'https://apiv2.bitcoinaverage.com/indices/global/ticker/BTCUSD' | python3 -c 'import sys, json; j=json.load(sys.stdin); print(j["last"])'`
        EURPERBTC=`curl -m 10 -L -s 'https://apiv2.bitcoinaverage.com/indices/global/ticker/BTCEUR' | python3 -c 'import sys, json; j=json.load(sys.stdin); print(j["last"])'`
        CHFPERBTC=`curl -m 10 -L -s 'https://apiv2.bitcoinaverage.com/indices/global/ticker/BTCCHF' | python3 -c 'import sys, json; j=json.load(sys.stdin); print(j["last"])'`
        TICKER=BTC
		BYTESPERTX=168
fi
USDPERSAT=`echo ${USDPERBTC} | awk '{print $1/100000000}'`

echo "___  ${USDPERBTC} USD/${TICKER}  /  ${EURPERBTC} EUR/${TICKER}  /  ${CHFPERBTC} CHF/${TICKER}  /  " >> ${BANNER}.new
echo "_________________________________________________________________________________________" >> ${BANNER}.new
echo "___" >> ${BANNER}.new

# report fees for various block times
for BLOCKS in 2 6 12 24 144 504 1008
do
#        SATPERBYTE=`${BITCOIN_CLI} -datadir=${BITCOIN_DATADIR} estimatesmartfee ${BLOCKS} | grep feerate  | grep -o '[0-9\.\-]*' | awk '{print $1*100000+0.5}'`
        SATPERBYTE=`${BITCOIN_CLI} estimatesmartfee ${BLOCKS} | grep feerate  | grep -o '[0-9\.\-]*' | awk '{print $1*100000+0.5}'`
        if [ `echo ${SATPERBYTE} | awk '{print int($1)}'` -lt 1 ]; then
                break;
        fi
        echo ${BLOCKS} ${SATPERBYTE} ${BYTESPERTX} ${USDPERSAT} | awk '{printf "___  Fee to confirm within %d blocks (%s hours) = %d sat/B ($%0.2f)\n", $1, int($1/0.06)/100, $2, $2*$3*$4, 1 }' >> ${BANNER}.new
done
echo "________________________________________________________________________________" >> ${BANNER}.new


# save backup of original banner on first run (just in case...)
if [ ! -f ${BANNER}.backup ]; then
	cp ${BANNER} ${BANNER}.backup
fi

# replace banner with newly generated version
mv ${BANNER}.new ${BANNER}