Building a Simple Redis Store with Node.js

Hey buddies! ?

I’ve been playing around with Node.js and decided to create a lightweight in-memory key-value store that mimics a simple version of Redis. If you're looking to get started with networking in Node.js, or just love exploring fun side projects, this one’s for you!

? Key Features:

• Commands Supported:
  • SET key value - Store key-value pairs.
  • GET key - Retrieve the value of a key.
  • DELETE key - Remove a key-value pair.
• Uses Node.js's net module to create a TCP server for handling client connections.
• A really simple redis store, great for quick tests or learning TCP interactions!

⚙️ Code Overview:

const net = require('net');

class SimpleRedis {
  constructor() {
    this.store = {};
  }

  set(key, value) {
    this.store[key] = value;
  }

  get(key) {
    return this.store[key] || null;
  }

  delete(key) {
    delete this.store[key];
  }
}

// Initialize store
const store = new SimpleRedis();

// Create a TCP server
const server = net.createServer((socket) => {
  console.log('Client connected');

  socket.on('data', (data) => {
    const command = data.toString().trim().split(' ');
    const action = command[0].toUpperCase();

    let response = '';

    switch (action) {
      case 'SET':
        const [key, value] = command.slice(1);
        store.set(key, value);
        response = `>> OK\n`;
        break;
      case 'GET':
        const keyToGet = command[1];
        const result = store.get(keyToGet);
        response = result ? `>> ${result}\n` : '>> NULL\n';
        break;
      case 'DELETE':
        const keyToDelete = command[1];
        store.delete(keyToDelete);
        response = `>> OK\n`;
        break;
      default:
        response = '>> Invalid command\n';
    }

    // Send the response with '>>'
    socket.write(response);
  });

  socket.on('end', () => {
    console.log('Client disconnected');
  });
});

// Start the server on port 3001
server.listen(3001, () => {
  console.log('Server is running on port 3001');
});

? What’s Happening:

• The server listens on port 3001 and responds to SET, GET, and DELETE commands.
• It’s super simple and straightforward—just send a command from any TCP client like telnet or netcat, and see your commands in action!

? To Try It Out:

1. Save the code as simpleRedis.js.
2. Run it with node simpleRedis.js.
3. Open a new terminal and connect to it using:

   telnet localhost 3001

1. Now, you can interact with your in-memory key-value store!

For example:

SET name Hoang
GET name
>> Hoang
DELETE name
GET name
>> NULL

Github
Give it a try! ? Let me know what you think or how you'd extend this.

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