Add option for disabling fan out

[marvelm]

Overview

• Add disableFanOut option to subscriber options.

This is useful for sending messages exactly once.

To use with push notifications on parse-server:

// Parse config
{
 //...
 push: {
  // ...
   queueOptions: {
    messageQueueAdapter: 'parse-server-gcloud-pubsub',
    disableFanOut: true,
    disablePushWorker: false,
    channel: 'my-channel',
   }
 }
}

[ranhsd]

Hi @marvelm sorry for the huge late in my response. Did you tested it and it works for you?
@flovilmart did you had the chance to review it?

[marvelm]

Hi @ranhsd. We've been running this in production for almost 2 months.

[marvelm]

I'll add some documentation around this feature before merging.

[ranhsd]

Awesome! I will consider to use it as well.

Thank you!