Easiest way to play a sound effect when a block is minted?

The Plaza
#1

Does anyone have some shellscript or ideas how to quickly and easily implement a program/script that would play a sound effect when either nud or bcexchanged has found a new block (ignoring stales/orphans).

Should the script poll the wallet for new incoming TXs or should it monitor the debug.log file for some specific strings?

1 Like
#2

Monitor debug.log and look for string “new block”, then text to speech “Just what do you think you’re doing, Dave?”

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#3

I’d be happy with just aplay and a wav file of my choice.

#4

https://docs.nubits.com/nu-client-commands/

you can probably use blocknotify in your conf file.

just add blocknotify=<script name> in your conf file to a script that plays a sound.

#5

I think he only wants to hear his own blocks.

#6

ohhhh… then ignore me… here’s a cat :cat:

1 Like
#7

Cat confirmed

2 Likes
#8

But what about walletnotify=<script name>?

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#9

i’m not sure if that works with block reward transactions, but he could test it.

#10

ok this sounds more plausible than blocknotify. will investigate

#11

Here’s some partly pseudo code for a blocknotify script (in case walletnotify doesn’t work) to start with:

#!/bin/bash
if [ ! -f tx_id_old ]; then
        touch tx_id_old
else
        tx_id_old=$(cat tx_id_old)
        tx_id_new=$(nud listtransactions | tail -n 4 | head -n 1 | awk -F':' '{print $2}')
        if [ "$tx_id_old" == "$tx_id_new" ]; then
        else
#               <execute play sound file script>
        fi
fi
#12

Here’s what I came up with.

nu.conf file:

rpcusername=xxxxx
rpcpassword=xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
server=1
walletnotify=/home/pi/Desktop/scripts/money.sh

money.sh:

#!/bin/bash

#Only if current time is more than `first_active_hour` audio will be played. This is to be quiet during the night.
first_active_hour=10

snd=$(( ( RANDOM % 3 )  + 1 ))
sfx_path="/home/pi/Desktop/scripts/sfx/gold_$snd.wav"
hour=`date +%H`

test "$hour" -gt "$first_active_hour" && (timeout --signal=SIGKILL 5s aplay -q "$sfx_path")

exit 0

This worked with blocknotify, played the sound and all, but I haven’t yet managed to find a block so I don’t know if it works with walletnotify.

1 Like
#13

When this is done and figured you could make a gist and we can link it from the raspi tutorial :wink:

1 Like
#14

TIP: if somebody is doing this under MacOS, there is no need to play a wav file, you could execute something like

$ say You minted a new block, congrats
#15

Just reporting that walletnotify seems to do the job very well. I’m still downloading the block chain from scratch but I am constantly hearing this sound effect already, probably because the node receives blocks that include transactions to my wallet that I have minted in the past.