Network-events NPM

Network Events

A dependency-free, light-weight event system using NodeJS's net, events, http, and crypto libraries.

NOTE: Not all builds of NodeJS ship with crypto, but most do. If you installed NodeJS through something like nvm, you're probably fine.

Installation

Install from npm:

npm install network-events

Usage

Basic

Here's a simple client/server example:

/* server.js */
const { Server } = require('network-events');

let count = 0;
const server = new Server({ clientPort: 5000 });

setInterval(() => {
  count++;
  server.emit({ event: 'count', data: { count } });
}, 5000);

/* client.js */
const { Client } = require('network-events');

const client = new Client({ port: 5000, host: 'localhost' });
client.on('count', (data) => console.log(data.count));

Every 5 seconds, the server will increment count and emit the result to all connected clients.

HTTP Server

Consume events via a REST endpoint and emit the event/data to all listening clients.

/* server.js */
const { Server } = require('network-events');

let count = 0;
const server = new Server({ clientPort: 5000, httpPort: 5001 });

const { Client } = require('network-events');

const client = new Client({ port: 5000, hot: 'localhost' });
client.on('http-event', data => console.log('Received HTTP event', data));
client.on('other-event', data => console.log('Received other event', data));

This exposes and endpoint that external entities can make REST calls to. An entity can make a POST request to http://localhost:5001/http-event with a POST body which will then be emitted to all connected clients. An entity can also post to /other-event and listening clients will also get that data.

With Encryption

You can also encrypt traffic using a secret key.

/* server.js */
const { Server } = require('network-events');

let count = 0;
const server = new Server({ clientPort: 5000, key: 'somesupersecretkey' });

setInterval(() => {
  count++;
  server.emit({ event: 'count', data: { count } });
}, 5000);

/* client.js */
const { Client } = require('network-events');

const client = new Client({ port: 5000, host: 'localhost', key: 'somesupersecretkey' });
client.on('count', (data) => console.log(data.count));