running background job on a specific action in sails js - 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

Answer 1

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.

Answer 2

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.