rethinkdb-job-queue

Introduction

rethinkdb-job-queue is a persistent job or task queue backed by RethinkDB. It has been built as an alternative to the many queues available on NPM.

Please Star on GitHub / NPM and Watch for updates.

Features

• Powered by RethinkDB
• Connect to multiple databases
• Create multiple queues
• Distributed worker nodes (PubSub)
• Global queue events
• Global job cancellation
• Global pause queue
• Run concurrent jobs
• Promise based with minimal callbacks
• Priority processing of jobs
• Job progress updates
• Delayed job start
• Find jobs in the queue
• Determine job uniqueness
• Job timeout
• Retrying failed jobs
• Job reanimation
• Job Editing
• Rich job history log
• Over 1400 integration tests

Documentation

For full documentation please see the wiki

See the Change Log for recent changes.

Project Status

• This rethinkdb-job-queue module is fully functional.
• There are over 1400 integration tests.
• Updated to v1.0.0 to support SemVer.

Quick Start

Installation

Note: You will need to install RethinkDB before you can use rethinkdb-job-queue

After installing RethinkDB install the job queue using the following command.

npm install rethinkdb-job-queue --save

WARNING: If you are using an older version of Node.js you may need the Babel Pollyfill. The index.js file points to the dist directory, which has been transpiled by Babel. Babel only transforms syntax.

Simple Example

const Queue = require('rethinkdb-job-queue')
const qOptions = {
  name: 'Mathematics' // The queue and table name
}
const cxnOptions = {
  db: 'JobQueue', // The name of the database in RethinkDB
}

const q = new Queue(cxnOptions, qOptions)

const job = q.createJob({
  numerator: 123,
  denominator: 456
})

q.process((job, next) => {
    try {
      let result = job.numerator / job.denominator
      // Do something with your result
      return next(result)
    } catch (err) {
      console.error(err)
      return next(err)
    }
})

return q.addJob(job).catch((err) => {
  console.error(err)
})

E-Mail Job Example using nodemailer

// The following is not related to rethinkdb-job-queue.
// This is the nodemailer configuration
const nodemailer = require('nodemailer')
const transporter = nodemailer.createTransport({
  service: 'Mailgun',
  auth: {
    user: '[e-mail]',
    pass: 'your-api-key-here'
  }
})

// Setup e-mail data with unicode symbols
var mailOptions = {
  from: '"Registration" <[e-mail]>', // Sender address
  subject: 'Registration', // Subject line
  text: 'Click here to complete your registration', // Plaintext body
  html: '<b>Click here to complete your registration</b>' // HTML body
}

// rethinkdb-job-queue configuration
const Queue = require('rethinkdb-job-queue')

// Queue options have defaults and are not required
const qOptions = {
  name: 'RegistrationEmail', // The queue and table name
  masterInterval: 310000, // Database review period in milliseconds
  changeFeed: true, // Enables events from the database table
  concurrency: 100,
  removeFinishedJobs: 2592000000, // true, false, or number of milliseconds
}

// Connection options have defaults and are not required
// You can replace these options with a rethinkdbdash driver object
const cxnOptions = {
  host: 'localhost',
  port: 28015,
  db: 'JobQueue', // The name of the database in RethinkDB
}

// This is the main queue instantiation call
const q = new Queue(cxnOptions, qOptions)

// Customizing the default job options for new jobs
q.jobOptions = {
  priority: 'normal',
  timeout: 300000,
  retryMax: 3, // Four attempts, first then three retries
  retryDelay: 600000 // Time in milliseconds to delay retries
}

const job = q.createJob()
// The createJob method will only create the job locally.
// It will need to be added to the queue.
// You can decorate the job with any data to be saved for processing
job.recipient = '[e-mail]'

q.process((job, next) => {
  // Send email using job.recipient as the destination address
  mailOptions.to = job.recipient
  return transporter.sendMail(mailOptions).then((info) => {
    console.dir(info)
    return next(info)
  }).catch((err) => {
    // This catch is for nodemailer sendMail errors.
    return next(err)
  })
})

return q.addJob(job).then((savedJobs) => {
  // savedJobs is an array of the jobs added with updated properties
}).catch((err) => {
  console.error(err)
})

About the Owner

I, Grant Carthew, am a technologist, trainer, and Dad from Queensland, Australia. I work on code in a number of personal projects and when the need arises I build my own packages.

This project exists because there were no functional job queues built on the RethinkDB database. I wanted an alternative to the other job queues on NPM.

Everything I do in open source is done in my own time and as a contribution to the open source community.

Contributing

1. Fork it!
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request :D

Please see the debugging and testing documents for more detail.

Credits

Thanks to the following marvelous packages and people for their hard work:

• The RethinkDB team for the great database.
• The RethinkDB driver rethinkdbdash by Michel
• The Promise library Bluebird by Petka Antonov.
• The uuid package.

This list could go on...

License

MIT