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An addon/plugin package to provide server-sent events functionality for AdonisJS 4.0+

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adonis-sse

An addon/plugin package to provide server-sent events functionality for AdonisJS 4.0+

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Getting Started

    adonis install adonisjs-sse

Usage

Firstly, follow the instructions in instructions.md file to setup the Provider and Middleware

See the instructions.md file for the complete installation steps and follow as stated.

Registering provider

Like any other provider, you need to register the provider inside start/app.js file.

const providers = [
  ...
  'adonisjs-sse/providers/ServerSentEventsProvider',
]

Registering middleware

Register the following middleware inside start/kernel.js file.

You can optionally place the sse middleware after the 'Adonis/Middleware/AuthInit' middleware

const globalMiddleware = [
  ...
  'Adonis/Middleware/AuthInit',
  'Adonis/Middleware/EventSourceWatcher'
]

Or alternatively setup the middleware as a named (use any name you feel like) middleware inside start/kernel.js file.

const namedMiddleware = {
  eventsource: 'Adonis/Middleware/EventSourceWatcher'
}

HINT: It would be much easier and better to make the EventSourceWatcher middleware a global middleware

Setup serve-sent events route inside start/routes.js file.

/** @type {typeof import('@adonisjs/framework/src/Route/Manager')} */
const Route = use('Route');

/**
 * If the 'eventsource' named middleware is set
 * then setup route like below
 */
Route.get('/stream', ({ source }) => {
      // send a server-sent events comment
      source.send("Hello AdonisJS", '!This is a comment!');
}).middleware(['eventsource']);

/**
 * If the middleware is a global middlware
 * then setup route like below
 */
Route.get('/stream', ({ source }) => {
      // send a server-sent events comment
      source.send("Hello AdonisJS", '!This is a comment!');
})

Route.post('/send/email', 'NotificationsController.sendEmail')

Example(s)

Setup a controller to dispatch server-sent events to the browser using the source.send(data: Object, comment: String, event: String, retry: Number) method like so:

/** @type {typeof import('@adonisjs/mail/src/Mail')} */
const Mail = use('Mail')

class NotificationsController {

    async sendEmail ({ request, auth, source }){

        let input = request.only([
            'ticket_user_id'
        ]);

        let { id, email, fullname } = await auth.getUser();
        let error = false

		try{

			await Mail.send(
                'emails.template', 
                { fullname }, (message) => {
				message.to(email) 
				message.from('crm.tickets@funsignals.co') 
				message.subject('Ticket Creation Job Status')
            })
            
		}catch(err){
            
            error = true
            
		}finally{

            source.send({
                ticket_reciever: id,
                ticket_creator: input.ticket_user_id,
                ticket_mail_status: `email sent ${error ? 'un' : ''}successfuly`
            }, null, 'update', 4000) // event: 'update', retry: 4000 (4 seconds)
			
        }
    }
}

module.exports = NotificationsController		
/**
 * source.send (METHOD)
 */

send( data: object, comment: string, event: string, retry: number );

Connecting from the client-side

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <!-- Polyfill for older browsers without native support for the HTML5 EventSource API. -->
    <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=EventSource"></script>
  </head>
  <body>
     <script id="server-side-events" type="text/javascript">
	     const stream = new EventSource("http://127.0.0.1:3333/stream");
	     
	     stream.addEventListener('message', function(e){
                 console.log("Data: ", e.data);
	     }, false);
	     
	     stream.addEventListener('open', function(e) {
		// Connection was opened.
	        console.log('connection open: true');
	     }, false);

	     stream.addEventListener('error', function(e) {
		  if (e.readyState == EventSource.CLOSED) {
		    // Connection was closed.
	            console.log('connection closed: true');
		  }
	     }, false);
     </script>
  </body>
</html>

License

MIT

Running Tests

    npm i
    npm run lint
    
    npm run test

Credits

Contributing

See the CONTRIBUTING.md file for info

Support

Coolcodes is a non-profit software foundation (collective) created by Oparand - parent company of StitchNG, Synergixe based in Abuja, Nigeria. You'll find an overview of all our work and supported open source projects on our Facebook Page.

Follow us on facebook if you can to get the latest open source software/freeware news and infomation.

Does your business depend on our open projects? Reach out and support us on Patreon. All pledges will be dedicated to allocating workforce on maintenance and new awesome stuff.

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An addon/plugin package to provide server-sent events functionality for AdonisJS 4.0+

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