Task 10 - Workers

Objectives

• Learn about background workers.
• Learn how to implement workers in your NodeJS application.

Learning Resources

Here are the list of learning resources for this task.

Topic	Resource
How to run NodeJS Cron Jobs	Link to this resource
Node Cron Documentation	Link to this resource

Tasks

Step 1: Set up Cron Job

• Create a new folder on our backend called workers, and create a new file in that folder called uptime.js.
• NPM install the node-cron module.
• Create a new job and schedule it to run every minute.

Step 2: Check Uptime.

• In that job, get a list of all the websites that you have on the database for all customers.
• Check uptime using the request module. (There are better ways to do it, but lets make this simpler for now.)
• If the website is down. Update the status to offline in the table. If the website is up, update the status to online. This should reflect on the dashboard when you reload the dashboard.

Step 3: Test

• Unit test the worker by adding few test websites (test cases). When you run the test, it should wait for a minute and then check the results. Validate if the results are correct.

Deliverable

• Push changes to Git, make sure the build passes.