Ethereum: How to save websockets data to DB

How ​​to Save WebSockets Data to a Database Using Ethereum

The Ethereum WebSockets API provides real-time, two-way communication between the client and the server. In this article, we will look at how to store WebSocket data received from a Binance stream into a database such as MySQL or PostgreSQL.

Prerequisites

  • Introduction to JavaScript, Node.js, and Ethereum development
  • Setting up an Ethereum base node (e.g. Ethereum Classic or Polygon) and a blockchain explorer (e.g. Etherscan)
  • Installing the required libraries: ws, mysql2, and dotenv

Step 1: Establishing a WebSocket Connection

To get started, you need to establish a connection to the Binance stream. You can use the wss://stream.binance.com:9443/ws/btcusdt@trade endpoint to connect to the Bitcoin USDT trade stream.

`javascript

const WebSocket = require('ws');

const wss = new WebSocket.Server({ port: 9443, secure: true });


Step 2: Processing WebSocket Messages
When you receive a message from the Binance stream, you will need to process it accordingly. You can use a library likewsto parse and process WebSocket messages.
javascript
wss. on('connection', (ws) => {
console. log('Client connected');
ws. on('message', (message) => {
const data = JSON. parse(message);
// Processing received data here...
ws. send(JSON. stringify({ type: 'result', data }));
});
ws. on('close', () => {
console. log('Client disconnected');
});
});

Step 3: Saving data to the database

Ethereum: How to save websockets data to DB

To store WebSocket data in a database, you will need an API that supports interaction with your database. We will use the mysql2library to connect to your MySQL or PostgreSQL database.

javascript

const mysql = require('mysql');

constant dbConfig = {

host: 'your_host',

user: 'your_user',

password: 'your_password',

database: 'your_database',

};

const connection = mysql.createConnection(dbConfig);

connection.connect((err) => {

if (err) {

console.error('connection error:', err);

return;

}

console.log('connected as id ' + connection.threadId);

// Sending data to database here...

connection.end();

});

`

Putting it all together

Here is a complete example demonstrating how to save WebSocket data to a MySQL database:

`javascript

const express = require(‘express’);

constant application = express();

const bodyParser = require(‘body-parser’);

constant ws = require(‘ws’);

const mysql = require(‘mysql2/promise’);

constant dbConfig = {

host: ‘your_host’,

user: ‘your_user’,

password: ‘your_password’,

database: ‘your_database’,

};

// Establish a WebSocket connection

const wss = new WebSocket.Server({ port: 9443, secure: true });

wss.on(‘connection’, (ws) => {

console.log(‘Client connected’);

// Processing incoming messages from Binance Flow

ws.on(‘message’, (message) => {

const data = JSON.parse(message);

// Processing data received here…

// Saving data to database

saveDataToDatabase(data);

});

ws.on(‘close’, () => {

console.log(‘Client disconnected’);

});

});

// Function to process and save WebSocket messages to the database

async function saveDataToDatabase(data) {

try {

const query = ‘INSERT INTO websocket_data (id, timestamp, data) VALUES (?, ?, ?)’;

const [result] = await connection.execute(query, [

null,

new Date().toISOString(),

JSON.stringify(data),

]);

console.log(‘Inserted into database:’, result);

} catch (err) {

console.error(‘Error inserting into database:’, err);

}

}

application.use(bodyParser.json());

application.listen(3000, () => {

console.