EventBus

EventBus is a nodejs wrapper to communicate with Google Pub/Sub. ✨

• Simple API’s to publish and subscribe,
• etc.

New Features!

• You can publish message to any topic
• Subscribe to any subscription ( For now, limited to only single subscription )

You can also:

• Check subscription status
• Unsubscribe with a single API
• Create multiple instances of event bus

Goal

Expose simple API’s for communication with Google Pub/Sub

Prerequisites

• Google Cloud account
• Google project with Pub/Sub enabled
  Click here for more details

Installation

EventBus-Prodio requires Node.js v6+ to run.

Install the dependencies and devDependencies and start the server.

$ git clone https://github.com/ProdioDesignWorks/EventBus.git
$ cd EventBus
$ npm install

For production environments…

$ npm install EventBus-Prodio --save

Plugins

EventBus-Prodio is extended with the following plugins. Instructions on how to use them in your own application are linked below.

How to use

const EventBus = require('EventBus-Prodio');
// google config file
const Bus = new EventBus({ 
    projectId: 'projectId', 
    keyFilename: 'projectId-keyFile.json' 
});

For Subscribing to a subscription

const subscriptionName = "subscriptionName";
const autoAck = true;
//If autoAck is set, then message's are auto acknowledged as soon as message is received
//If autoAck is not set, then subscriber has to explicitly acknowledge the message
const onMessage = (message) => console.log(message);
Bus.subscribe({ subscriptionName, autoAck }, onMessage);

For Publishing message on topic

const topicName = "topicName";
const message = "User registered";
const customAttributes = {
    serviceId: 'REGISTRATION-SERVICE',
    user: { 
        name: 'John Doe',
        email: 'johndoe@example.com'
    }
};
//async await 
const messageId = await Bus.publish(topicName, msg, customAttributes);
//promise
Bus.publish(topicName, msg, customAttributes).then(
    messageId => console.log(messageId) 
).catch(
    error => console.error(error)
);

Please refer examples for more details

Development

Want to contribute? Great!

EventBus-Prodio uses Babel + Eslint for fast developing.
Make a change in your file and instantanously see your updates!

Open your favorite Terminal and run these commands.

Todos

• Write MORE Tests
• Add multiple subscriptions support
• Create Topic & Subscription API’s
• Ordered events

License

MIT

Free Software, Hell Yeah!