Introduction to NSSocket

NSSocket is a versatile and powerful library for building networked applications in Node.js. It offers an easy-to-use API for creating both client and server socket connections, with many built-in features to handle common networking tasks efficiently. In this blog post, we will explore various NSSocket APIs along with detailed code snippets to demonstrate their usage. Let’s dive into the world of network sockets with NSSocket!

Setting Up NSSocket

First, you need to install NSSocket in your Node.js application. You can do this using npm:

npm install nssocket

Creating a Server

To create a server that listens for incoming connections, you can use the following code:

 const nssocket = require('nssocket');
const server = nssocket.createServer((socket) => {
  console.log('New connection established');

  socket.on('data', (data) => {
    console.log('Received data:', data);
  });

  socket.send('greeting', { message: 'Hello, client!' });
});
server.listen(6785, () => {
  console.log('Server listening on port 6785');
}); 

Creating a Client

To connect to the server as a client, you can use the following code:

 const nssocket = require('nssocket');
const socket = new nssocket.NsSocket({ type: 'tcp4' });
socket.connect(6785, '127.0.0.1', () => {
  console.log('Connected to server');

  socket.on('greeting', (data) => {
    console.log('Received greeting:', data.message);
  });

  socket.send('data', { message: 'Hello, server!' });
}); 

Handling Disconnections

NSSocket provides events to handle disconnections gracefully:

 socket.on('close', () => {
  console.log('Connection closed');
});
socket.on('error', (err) => {
  console.error('Error occurred:', err);
}); 

Broadcasting to Multiple Clients

You can broadcast messages to all connected clients using the following code:

 const clients = [];
const server = nssocket.createServer((socket) => {
  clients.push(socket);

  socket.on('data', (data) => {
    console.log('Received data:', data);
    clients.forEach(client => {
      if (client !== socket) {
        client.send('broadcast', data);
      }
    });
  });
});
server.listen(6785); 

App Example: Chat Application

Let’s create a simple chat application using NSSocket:

Server Side

 const nssocket = require('nssocket');
const clients = [];
const server = nssocket.createServer((socket) => {
  clients.push(socket);
  console.log('New client connected');

  socket.on('message', (data) => {
    console.log('Received message:', data.text);
    clients.forEach(client => {
      if (client !== socket) {
        client.send('message', { text: data.text });
      }
    });
  });

  socket.on('close', () => {
    const index = clients.indexOf(socket);
    if (index !== -1) {
      clients.splice(index, 1);
    }
    console.log('Client disconnected');
  });
});
server.listen(6785, () => {
  console.log('Chat server running on port 6785');
}); 

Client Side

 const nssocket = require('nssocket');
const socket = new nssocket.NsSocket({ type: 'tcp4' });
socket.connect(6785, '127.0.0.1', () => {
  console.log('Connected to chat server');

  socket.on('message', (data) => {
    console.log('New message:', data.text);
  });

  process.stdin.on('data', (input) => {
    socket.send('message', { text: input.toString().trim() });
  });
}); 

With the above example, you can create a multi-client chat application where each client can send and receive messages from other connected clients in real-time.

By mastering the NSSocket API, you can build various network applications, including chat servers, real-time data processors, and more.

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