If anyone is interested, I wrote a node.js app to monitor addresses in your wallet, as well as any you specify, and it will send you a desktop notification whenever one of those addresses receives a payment.
https://github.com/n-johnson/darkcoin-notifyI would love some feedback on it!
How it looks:
https://i.imgur.com/HP5uU0i.pngClose up:
https://i.imgur.com/MQu9MY3.pngRequirements:
- Linux, OSX, and Windows are all supported (only tested on ubuntu as of yet though)
- node.js
- darkcoind running
I think the darkcoin-qt client may have a similar function (I know some coins have that feature), but this is meant for those running darkcoin in daemon mode or if you want to watch other addresses not in your hot wallet (a paper wallet address for example)
hmm this could be useful for my project... since im not that good with js, would it be possible for it to call an url with balance of wallet ?
This project? Not really, what this does is every couple of seconds it sends a command to the darkcoin daemon asking for what the latest block is. If that block is newer than the stored latest block, it then will grab all of the transactions from the block and parse the output address out of them. If any of those addresses are on the list of addresses to watch, it sends a notification.
As for calling a URL to get a wallet balance.
There are a few ways that could be done.
If you are just looking for the balance of an address in your wallet, than you would just have to send a command to darkcoind asking for the balance via an RPC connection, which could be done in any programming language you wanted.
If you are looking for the balance of any given address, however, that is a little more complicated. In order to calculate that, you would have to query the blockchain for any transaction that had that address as an input or output, and sum the results. Doing that on the fly would take upwards of 30 seconds for the current blockchain size (based on my tests on my 4 year old 6 core processor). So to do it in any useful manner, you would have to have some sort of system in place to analyze the blockchain and store transactions in a database indexed by public address for both the past, and constantly updating as new blocks come in. Then instead of querying the blockchain, you would just ask your database for the transactions involving the given address, and because it is indexed by the public address, it would be able to give the result in a fraction of a second.
I wanted some cool stuffed animals from games *sad*
