A vanillajs library to facilitate interaction with the Topl blockchain network. This server-side SDK is compliant with the Dion version of the Topl protocol as defined by the reference implementation, Bifrost client.

Installation

To install from npm run npm install --save mubrambl in your project directory

To install from source:

• Git clone using git clone https://github.com/topl/muBrambl
• Run npm run install within the cloned repo to install all dependencies

Usage

To create a minimal instance of BramblJS in your application, include the following commands:

const Brambl = require('mubrambl');
const brambl = new BramblJS('PASSWORD')

This will create a new Requests instance targetting a local node running at http://localhost:9085 and generate a new KeyManager instance for signing transactions, using Curve25519 and encrypted with PASSWORD

BramblJS provides the following modules:

• Brambl - primary module that provides high-level capabilities and access to
• Requests - sub-module for sending json-rpc requests to a specified chain provider.
• KeyManager - sub-module that provides functions for creating, importing, and exporting Bifrost compatible keyfiles.

A brief overview of each module is given below

Brambl

A helper library for interacting with the Topl protocol. Requests to the API layer of a chain provider conform to JSON-RPC standards and are managed by the Requests module. Key Management conforms to the Dion specification of the Topl protocol as implemented in the reference client Bifrost v1.0.0.

Transactions may be issued using the method brambl.transaction following instantiation of the class. In summary, a transaction is implemented by:

1. Requesting a prototype transaction from a specified network provider (i.e Topl Torus service or local private testnet)
2. Signing the raw transaction bytes using the keyfile in the KeyManager instance.
3. Sending the fully formed transaction to the broadcastTx method available in the Requests module.

After issuance, the pollTx method may be used to begin polling the chain provider to determine the status of the newly issued transaction.

Requests

The Requests module is compliant with Bifrost's JSON-RPC interface documented at https://topl-rpc.docs.topl.co A new JSON-RPC interface class may be instantiated by

const requests = Brambl.Requests()

By default requests will be sent to http://localhost:9085. This is the standard address and API port that Bifrost listens on when launched locally. All of the methods available in this module are asynchronous and will return Promises that must be handled using async/await structures or .then(). For example:

requests.chainInfo().then(console.log).catch(console.error)

Brambl-layer API key protection

By default, Bifrost uses an API key of topl_the_world! to validate requests on locally running test nets. If you are planning to use the Topl Torus service for servicing API requests, you will need to register for an API key from Torus and subsequently use this value in the constructor of the Brambl layer object. Standard best practices for protecting API keys should be followed in this case (i.e. saving variables in .ENV or config files that are not shared with version control).

KeyManager

The KeyManager module is compliant with Bifrost's Gjallarhorn Key Manager service and provides an straightforward interface for creating new keyfiles as well as creating and verifying signatures on transactions. New encrypted keyfiles are generated using Curve25519 key pairs and are encrypted using an AES-256 cipher with a user-specified password. All data within the keyfile is encoded using Base58.

A new KeyManager may be created directly using

const keyManager = Brambl.KeyManager('PASSWORD')

where 'PASSWORD' is the user provided encryption password for the keyfile.

Testing

To test run "npm test" from the root directory. This will run a mocha test that will ensure that the encryption and KeyManager code is functioning properly.

Examples

Below are examples for using the BramblJS library with a private testnet running on your localhost. Please consult the Bifrost documentation for further instructions on deploying a local private testnet.

Retrieving the timestamp of the latest block

Brambl.Requests().chainInfo().then(x => {
    const timestamp = new Date(x.result.bestBlock.timestamp)
    const blockHeight = x.result.height
    console.log('Block #' + blockHeight + ' forged at ' + timestamp)
})

Importing a keyfile to a KeyManager instance

const keyManager = Brambl.KeyManager({ keyPath: '/path/to/file', password: 'encryption_password' })

Issuing a createAsset transaction

const brambl = new Brambl('test')

const createParams = {
    issuer: brambl.keyManager.pk,
    assetCode: "test-" + Date.now(),
    recipient: brambl.keyManager.pk,
    amount: 1,
    fee: 0
};

brambl.transaction('createAssetsPrototype', createParams).then(console.log)

Creating and polling a createAsset transaction

const brambl = new Brambl('test')

const createParams = {
    issuer: brambl.keyManager.pk,
    assetCode: "test-" + Date.now(),
    recipient: brambl.keyManager.pk,
    amount: 1,
    fee: 0
};

brambl.transaction('createAssetsPrototype', createParams)
    .then(res => { console.log('Unconfirmed transaction'); console.log(res); return res })
    .then(res => brambl.pollTx(res.result.txHash))
    .then(res => { console.log('\nConfirmed transaction'); console.log(res) })
    .catch(console.log)

License

Brambl is licensed under the Mozilla Public License version 2.0 (MPL 2.0). A copy of this license may be found here