events

Support for events backend

Q&A plugin publishes messages through Backstage Event system utilizing EventsService. To set up the event broker in your application, follow the steps described in https://github.com/backstage/backstage/tree/master/plugins/events-backend.

import { createBackend } from '@backstage/backend-defaults';

const backend = createBackend();
backend.add(import('@backstage/events-backend'));
backend.add(import('@drodil/backstage-plugin-qeta-backend'));

backend.start();

Events are published in topic qeta. The following events are published:

• New post
  • payload: post, author
  • metadata.action = new_post
• Posting answer
  • payload: question, answer, author
  • metadata.action = post_answer
• Comment post
  • payload: post, author, comment
  • metadata.action = comment_post
• Comment answer
  • payload: question, answer, author, comment
  • metadata.action = comment_answer
• Answer marked as correct
  • payload: question, answer, author
  • metadata.action = correct_answer
• Answer marked as incorrect
  • payload: question, answer, author
  • metadata.action = incorrect_answer
• Vote post
  • payload: post, author, score
  • metadata.action = vote_post
• Vote answer
  • payload: question, answer, author, score
  • metadata.action = vote_answer
• Delete post
  • payload: post, author
  • metadata.action = delete_post
• Delete answer
  • payload: question, answer, author
  • metadata.action = delete_answer
• New collection
  • payload: collection, author
  • metadata.action = new_collection
• Update collection
  • payload: collection, author
  • metadata.action = update_collection
• Delete collection
  • payload: collection, author
  • metadata.action = delete_collection

Example handling:

events.subscribe({
  id: 'qeta-backend-post-create-subscriber',
  topics: ['qeta'],
  onEvent: async event => {
    if (event.metadata?.action !== 'new_post') {
      return;
    }
    // Handle new post
  },
});