NodeJS Example

NodeJS Example

This nodejs script monitors the balance history of an account in a graphene-based network such as BitShares 2.0.

Installation

A NodeJS library to monitor incoming transactions can be downloaded from

git clone https://github.com/xeroc/node-graphene-monitor
cd node-graphene-monitor
npm install

Configuration

To make use of this library, we can instruct any full-node to send notifications for all incoming transactions for any account. Let’s discuss the following example script in more details:

We first prepare our variables and import all required modules

Define the accountID and the memo_wif_key. The accountID can be obtained from the GUI wallet, or by issuing::

>>> get_account <accountname>

If the script exists abnormally, you can continue operations by setting last_op to the last operation id that you have captured before the abnormal exit.

Note

The current implementation has a maxium history size of 100 transaction. If you have missed more than 100 transaction with the current implementation, manual fixing is required.

The settings are located in config.js and take

  • the rpc connection settings
  • the memo decoding private key in wif format
  • the account ID to monitor
  • the last operation that has been logged successfully in your backed in case of ungraceful shutdown

Note

The last operation will show a maximum of 100 most recent transactions. If more have been missed due to a down-time. Manual intervention is necessary.

Furthermore, in Graphene, memos are usually encrypted using a distinct memo key. That way, exposing the memo private key will only expose transaction memos (for that key) and not compromise any funds. It is thus safe to store the memo private key in 3rd party services and scripts. The memo public key can be obtained from the account settings or via command line::

>>> get_account <myaccount>

in the cli wallet. The corresponding private key can be obtain from::

>>> dump_private_keys

Note that the latter command exposes all private keys in clear-text wif.

Running

The script can be executed simply by

npm start

and will show all incoming transactions and corresponding (decoded) memo.