VerusdWeb

A bi-directional and lightweight Verus Blockchain interface that enables receiving chain events and accepting request to the Verus chain. This fully supports all existing PBaaS chains.

Introduction

VerusdWeb can be configured to receive real-time blockchain events as well as sending RPC request to the Verus Blockchain. This can work as a proxy-server with a straigthforward integration and minimal setup to the chain so you can run it wihout much effort.

Just setup the node and run. By default, you can access all publicly-safe rpc methods.

Use-cases

Proxy Verus Node API for Bi-directional, Real-Time Communication:

You're aiming to create a proxy layer over the Verus Node API that supports real-time, event-driven communication, using WebSocket for push notifications and updates from the blockchain.

Custom Scripts on Blockchain Events:

The system would allow for scripts to be triggered based on specific blockchain events, offering automation or immediate action based on blockchain state changes.

Support for Verus REST API Methods:

Out-of-the-box support for common Verus RPC methods, allowing users to interact with these methods via both HTTP and WebSocket.

Custom REST API Endpoints:

Users can define their own API endpoints to extend functionality beyond what's provided by default Verus APIs, potentially using a utility class for ease of integration with existing RPC methods.

Custom API(Like Caching and Calculations):

Creating a custom API that can cache blockchain data for performance or perform additional calculations based on blockchain data like liquidity metrics or other operations that requires heavy/extra computations before the request is returned.

Setup

Verus Blockchain Setup

Enable the ZMQ setting first by adding the following lines in the VRSC.conf.

📑 Note
You should have a Verus node running locally.
The address 127.0.0.1:8900 will serve as the ZMQ web server to be accessed by this library. You can change it to any available ports.

OS	Directory
	~/.komodo/VRSC
	/Users//Library/Application Support/komodo/VRSC
	%AppData%\Komodo\VRSC\

Steps

This is applicable for Verus and PBaaS blockchains.

1. Update the configuration file (see below).
2. Restart the node.

ZMQ Configuration

Copy and paste to the config file.

...
zmqpubrawblock=tcp://127.0.0.1:8900
zmqpubrawtx=tcp://127.0.0.1:8900
zmqpubhashtx=tcp://127.0.0.1:8900
zmqpubhashblock=tcp://127.0.0.1:8900

⛓ PBaaS Chain Ready

PBaaS is already supported by this library. To enable, just follow the same setup procedure.
Ideally, the port should be different from the Verus node ZMQ configuration.

Take note that PBaaS chain configurations (*.conf file) are located in a directory different from Verus.
For example, in Linux, can be found in ~/.verus/pbaas/<pabaas_chain_id>/<pabaas_chain_id>.conf

🔖see for more details

Installation

To install, you can use npm:

npm i verusd-web

Usage

Importing the Library

import { VerusdWeb } from 'verusd-web';

Samples

1. Basic Setup

• Run the websocket and http server at the same time.
• Call the supported RPC methods.
• Request can be sent thru the websocket or http endpoints.

const vdWeb = new VerusdWeb({
    daemonConfig: {
        host: 'localhost',
        port: 27486,
        user: 'user',
        password: 'password',
        zmq: { host: 'localhost', port: 8900 }
    },
    localServerConfig: { port: 3333 },
});


try {
    vdWeb.open();
} catch(e) {
    console.error(`Error occurred!`);
    vdWeb.close();
}

Check the Result

• To test using Postman, access the following url. This enables you to receive real-time chain events.
  endpoint : ws://localhost:3333/verusd/web

• To do an RPC call to the node using websocket, use the following. From the client, you can send a message in the following format.

{"m": "getblock", "p": ["c084c79d1e6097d4b5e7db87c3057337f05bad85ef757446a6461402993c579c"]}

• To do an RPC call to the node using http, use the following. From the client, you can send a message in the following format.
  endpoint : http://localhost:3333/api/v1/verusd/web

{"m": "getblock", "p": ["c084c79d1e6097d4b5e7db87c3057337f05bad85ef757446a6461402993c579c"]}

---

2. Create Custom API Routes(New Endpoints)

• Create a custom routes.
• Use RpcService.sendChainRequest to send an RPC request the chain. It's a built-in utility.
• Routing feature uses express under the hood.

function txController(req: Request, res: Response) {
    const tx = req.params.tx;
    RpcService
        .sendChainRequest('getrawtransaction', [ tx ])
        .then((v: any) => { res.send(v) });
}

function blockController(req: Request, res: Response) {
    const block = req.params.block;
    RpcService
        .sendChainRequest('getblock', [ block ])
        .then((v: any) => { res.send(v) });
}

const vdWeb = new VerusdWeb({
    daemonConfig: {
        host: 'localhost',
        port: 27486,
        user: 'user',
        password: 'password',
        zmq: { host: 'localhost', port: 8900 }
    },
    localServerConfig: {
        port: 3333,
        customApiRoutes: [
            { method: 'get', apiVersion: 1, route: 'tx/:tx', controller: txController },
            { method: 'get', apiVersion: 1, route: 'block/:block', controller: blockController }
        ],
    },
});

Check the Result

• Try to access from the browser.
• Request is handled by the custom function txController

http://localhost:3333/api/v1/tx/91048ebae23b94f7542170bef4055bcf9d37c5b1206ca5db746e4a207174ab45

• Request is handled by the custom function blockController

http://localhost:3333/api/v1/block/1233353

---

3. Listen to Blockchain Events

• Listen when a new block or transaction is emitted.
• Run a custom script when an event occur.
• Customize the data returned to the clients.

const vdWeb = new VerusdWeb({
    daemonConfig: {
        host: 'localhost',
        port: 27486,
        user: 'user',
        password: 'password',
        zmq: { host: 'localhost', port: 8900 }
    },
    localServerConfig: {
        port: 3333,
    },
});

vdWeb.zmq.onHashBlock(async (value: EventData, _topic?: string, _result?: Object, wsServer?: WsServer): Promise<Object> => {
    console.log("[ On New Block ]");
    RpcService.sendChainRequest('getblock', [value]). then((decodedBlock: any) => {
        wsServer?.send(decodedBlock);
    });
    return value;
});

vdWeb.zmq.onHashTx(async (value: EventData, _topic?: string, _result?: Object, wsServer?: WsServer): Promise<Object> => {
    console.log("[ On New Tx ]");
    RpcService.sendChainRequest('getrawtransaction', [value]).then((tx) => {
        RpcService.sendChainRequest('decoderawtransaction', [tx.result]). then((decodedTx: any) => {
            wsServer?.send(decodedTx);
        });
    });
    return value;
});

Check the Result

• Check using any ws client
  endpoint : ws://localhost:3333/verusd/web
• Check from your console to see when an event is emitted.
• wsServer?.send(v) is run to make sure the result is returned to the websocket client;
• With these, data can be customized as needed.

[ Check the Samples ]

See the video here

---

Issues/Inquiries

For any issues or inquiries, you can raise a PR or contact me at

Contacts	-
	Pangz#4102
	pangz.lab@gmail.com
	@PangzLab

Reference

• Verus : https://verus.io/
• Verus Wiki : https://wiki.verus.io/#!index.md
• Bitcoin ZMQ : https://github.com/bitcoin/bitcoin/blob/master/doc/zmq.md

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Verus ID : pangz@
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License

This library is released under the MIT License.