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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.
`JavaScript
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.
`JavaScript
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.
`JavaScript
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 Date to the Database Here ...
connection.end ();
});
putting it all together
HERE’S A COMPLETE EXAMPLE THAT DEMSTRATATES 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
Savedatodatabase (Data);
});
ws.on (’close’, () => {
console.log (’client disconnected’);
});
});
// Function to Process and Store Websocket Messages in the Database
Async Function Savedatodatabase (Data) {
try {
Const query = 'insert into websocket_data (ID, Timestamp, Date) 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 to Database:’, ERR);
}
}
app.use (bodyparser.json ());
app.listen (3000, () => {
Console.
