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Saving WebSockets Data to a Database using Ethereum
Ethereum’s WebSockets API allows for real-time, bidirectional communication between a client and a server. In this article, we’ll explore how to save WebSocket data received from the Binance stream to a database, such as MySQL or PostgreSQL.
Prerequisites
- Familiarity with 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 required libraries:
ws,mysql2, anddotenv
Step 1: Establish WebSocket Connection
To start, 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.
const WebSocket = require('ws');
const wss = new WebSocket.Server({ port: 9443, secure: true });
Step 2: Handle WebSocket Messages
When a message is received from the Binance stream, you’ll need to handle it accordingly. You can use a library like ws to parse and process WebSocket messages.
wss.on('connection', (ws) => {
console.log('Client connected');
ws.on('message', (message) => {
const data = JSON.parse(message);
// Process the received data here...
ws.send(JSON.stringify({ type: 'result', data }));
});
ws.on('close', () => {
console.log('Client disconnected');
});
});
Step 3: Save Data to a Database
To save WebSocket data to a database, you’ll need to use an API that supports interacting with your database. We’ll use the mysql2 library to connect to your MySQL or PostgreSQL database.
const mysql = require('mysql');
const 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('error connecting:', err);
return;
}
console.log('connected as id ' + connection.threadId);
// Send data to the database here...
connection.end();
});
Putting it all Together
Here’s a complete example that demonstrates how to save WebSocket data to a MySQL database:
“`javascript
const express = require(‘express’);
const app = express();
const bodyParser = require(‘body-parser’);
const ws = require(‘ws’);
const mysql = require(‘mysql2/promise’);
const dbConfig = {
host: ‘your_host’,
user: ‘your_user’,
password: ‘your_password’,
database: ‘your_database’,
};
// Establish WebSocket connection
const wss = new WebSocket.Server({ port: 9443, secure: true });
wss.on(‘connection’, (ws) => {
console.log(‘Client connected’);
// Handle incoming messages from the Binance 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 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().toISOSString(),
JSON.stringify(data),
]);
console.log(‘Inserted into database:’, result);
} catch (err) {
console.error(‘error inserting to database:’, err);
}
}
app.use(bodyParser.json());
app.listen(3000, () => {
console.