Nodejs Backend Challenge

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Objectives

​ The purpose of completing this test is to show us how you approach and solve a problem. ​

• State your assumptions. Anywhere you feel that the requirements are unclear please make an assumption and document that assumption.
• Describe Trade-offs. When you are making a decision about using one design/approach vs. another try to make a quick note about why you made the choice you did.
• Provide tests. You should provide unit tests for the code that you write. ​ ​

Requirements

• Wakecap is an IoT company that has a products dealing with workers helmets to get data needed to track their movement and measure their productivity as well. The solution provides a lot of reports to the sites' admins and allow them to track their efficiently.

• The structure of each site is as following:

  • Client (Al Futtaim for example)
  • Al Futtaim has multiple sites (Like City Center)
  • Every Site has it's own workers ​

• For each site, there is a specific configuration:

  • Timezone (Used to manage the timing of the tracked workers against UTC)
  • Starting hour (Used to figure out the time the workers start their daily operation as Check In)
  • Ending hour (Used to figure out the time the workers end their daily operation as Check Out)
  • Late threshold (the Value where every worker exceeds the work shift interval they will be considered as late worker)

• The site admin need daily report contains:

  • Show a summary of absent workers
  • Show a summary of late workers
  • Total active hours for workers "is_active=true"
  • Total inactive hours for workers "is_active=false" (The hours that the worker spent in the site leaving the helmet away, or not moving from his place for 5 minutes) ​

• Make sure the report should be generated every midnight depends on site's different timezone assuming we have multiple sites in different time zones.

• We receive every 3 minutes new location update from our assets

  {
      "coordinates" : {
          "coordinates" : [
              55.1404609680176,
              25.0615882873535
          ],
          "_id" : ObjectId("5daddacc03feb33cb822ac23"),
          "type" : "Point"
      },
      is_active: true,
      "duration" : 180,
      "worker_id" : "24"
  }
  

  • coordinates: His location when this message is sent from the device
  • is_active we have sensor detect if the worker is working or not
  • duration: number of seconds between sending this message and the pervious message.

Technologies

• Node.js
• Mongoose
• Testing Mocha and Chai
• Docker ​

Criteria

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• Use following coding style guide
• Efficient MongoDB queries and indexes
• Mongoose schemas and models
• JSDoc for documenting JavaScript code

Wakecap backend task

WakeCap backend task is a backend for an IOT app

To start up the containers, we can open the terminal (or command prompt) in the root folder of our project and issue the below command:

$ docker-compose up

Another useful command for docker compose is when you want to rebuild a new image for your container. Basically, this is for a case where you have made some changes to your application code and want to rebuild the images:

$ docker-compose up --build

you can still run the test like this:

$ docker-compose run --rm project_name npm run test

We can now access the application documentation at http://localhost:3000/api/v0/explore

if you starting applicaiton locally not in container just change variable in env to localhost