Saving WebSockets Data to a Database Using Ethereum
Ethereum’s WebSockets API enables real-time, two-way communication between a client and a server. In this article, we will look at how to save WebSocket data received from a Binance stream to a database such as MySQL or PostgreSQL.
Prerequisites
- Knowledge of JavaScript, Node.js, and Ethereum development
- Set up a basic Ethereum node (e.g. Ethereum Classic or Polygon) and a blockchain explorer (e.g. Etherscan)
- Install the required libraries:
ws,mysql2, anddotenv
Step 1: Establish a WebSocket Connection
To get started, you need to establish a connection to the Binance stream. You can connect to the Bitcoin USDT trade stream using the endpoint “wss://stream.binance.com:9443/ws/btcusdt@trade”.
const WebSocket = request('ws');
const wss = new WebSocket.Server({ port: 9443, secure: true });
Step 2: Handling WebSocket messages
When a message arrives from the Binance stream, you need to handle it appropriately. You can use a library such as ws to parse and process WebSocket messages.
wss.on('connection', (ws) => {
console.log('Client connected');
ws.on('message', (message) => {
const data = JSON.parse(message);
// Processing the received data here...
ws.send(JSON.stringify({ type: 'result', data }));
});
ws.on('close', () => {
console.log('Client disconnected');
});
});
Step 3: Save data to database
To save WebSocket data to a database, you need to use an API that supports database interaction. We use the mysql2library to connect to a MySQL or PostgreSQL database.
const mysql = request('mysql');
const dbConfig = {
host: 'your_host',
user: 'your_user',
password: 'your_password',
database: 'your_database',
};
const connection = mysql.createConnection(dbConfig);
connect.connect((err) => {
if (err) {
console.error('error connecting:', error);
return;
}
console.log('connected as id ' + connect.threadId);
// Sending data to database here...
connection.end();
});
Putting it all together
Here is a complete example showing how to save WebSocket data to a MySQL database:
“ javascript
const express = request(‘express’);
const app = express();
const bodyParser = request(‘body-parser’);
const ws = request(‘ws’);
const mysql = request(‘mysql2/promise’);
const dbConfig = {
host: ‘your_host’,
user: ‘your_user’,
password: ‘your_password’,
database: ‘your_database’,
};
// Create a WebSocket connection
const wss = new WebSocket.Server({ port: 9443, secure: true });
wss.on(‘connection’, (ws) => {
console.log(‘Client connected’);
// Handle messages from Binance data stream
ws.on(‘message’, (message) => {
const data = JSON.parse(message);
// Process the received data here…
// Save data to database
saveDataToDatabase(data);
});
ws.on(‘close’, () => {
console.log(‘Client disconnected’);
});
});
// Function to process and store WebSocket messages in database
async function saveDataToDatabase(data) {
try {
const query = ‘INSERT INTO websocket_data (id, timestamp, data) VALUES (?, ?, ?)’;
const [result] = wait for connection.execute(query, [
null,
new Date().toISOString(),
JSON.stringify(data),
]);
console.log(‘Inserted to database:’, result);
} catch (err) {
console.error(‘error inserting into database:’, err);
}
}
app.use(bodyParser.json());
app.listen(3000, () => {
console.
