running background job on a specific action in sails js

Question

i am trying to make a service that runs in background when specific event happens. As an example when user verifies email i want my service of deleting possible unverified duplicate emails form database. i tried using kue to save my purpose but i think its more like the services will run once the sails lift fires?

so how to run a service when specific event happens? any help would be much appreciated.

thanks

score 2 · Answer 1 · answered Aug 11 '16 at 14:24

You can indeed use Kue for this purpose.

Create a config file kue.js for Kue

var kue = require('kue');
var kue_engine = kue.createQueue({
  prefix: 'kue',
  redis: {
    port: '6379',
    host: 'localhost'
  }
});


process.once('SIGTERM', function (sig) {
  kue_engine.shutdown( 5000, function(err) {
    console.log( 'Kue shutdown: ', err||'' );
    process.exit( 0 );
  });
});

module.exports.kue = kue_engine;

Add the job to Kue in relevant controller action.

var kue_engine = sails.config.kue;
kue_engine.create('delete_verified_email', {email: '123@456.com'})
  .priority('medium')
  .attempts(3)
  .save();

Create a worker.js in project root to consume kue jobs.

var kue = require('kue');
require('sails').load({
    hooks: {
        blueprints: false,
        cors: false,
        csrf: false,
        grunt: false,
        http: false,
        i18n: false,
        logger: false,
        policies: false,
        pubsub: false,
        request: false,
        responses: false,
        session: false,
        sockets: false,
        views: false
      }
    }, function (err, app) {
          sails.log.info('Starting kue');
          var kue_engine = sails.config.kue;

          //register kue.

          kue_engine.on('job complete', function (id) {
              sails.log.info('Removing completed job: ' + id);
              kue.Job.get(id, function (err, job) {
                  job.remove();
              });
          });
          kue_engine.process('delete_verified_email', 20, function (job, done) {
              // you can access the data passed while creating job at job.data
              // all the sails models, services are available here
              console.log(job.data.email)
              done && done();
          });

Run the worker.js to consume the kue jobs created by your sails app.

score 1 · Answer 2 · answered Aug 10 '16 at 19:35

Maybe Sails.js lifecycle hooks could help you. We are using them for instance to update statistics, e.g. persisting number of users per type after a user update call.

Also we are using Node Agenda (Sails.js hook) to create jobs to be executed either one time to a defined time in the future or like a cron job. Maybe you will want to collect the invalid/ expired email address verification entries to be purged and delete them in a hourly batch.

running background job on a specific action in sails js

2 Answers2