Coding Exercise: Data Storage API (Node.js) 🐢🚀

Implement a small HTTP service in Node.js to store objects organized by repository. Clients of this service should be able to GET, PUT, and DELETE objects.

Expectations

This exercise gives you an opportunity to build a service on your own time, rather than an in-person interview where you code on a whiteboard.

We respect your time, and don't expect you to spend more time than you want to complete this exercise. We value focused, high-quality code over code that is optimized for all possible edge cases.

General Requirements

• The service should de-duplicate data objects by repository.
• The included tests should pass and not be modified. Adding additional tests is encouraged.
• The service should implement the API as described below.
• The data can be persisted in memory, on disk, or wherever you like.
• External dependencies can be used, but are not required.

Suggestions

• Your code will be read by humans, so organize it sensibly.
• Use this repository to store your work. Committing just the final solution is OK but we'd love to see your incremental progress. We suggest taking a look at GitHub flow to structure your commits.
• Submit a pull request once you are happy with your work.
• Treat this pull request as if you're at work submitting it to your colleagues, or to an open source project. The body of the pull request can be used to describe your reasoning and any assumptions or tradeoffs in your implementation.
• You are welcome to use the existing express module dependency or any other web framework that you are comfortable with.
• Remember that this is a web application, and multiple requests could come in at the same time. Be sure to plan for this.
• For data storage, we suggest starting simple. Try to get to a working solution and avoid complex dependencies like databases at first. If you have extra time, you can always experiment with other options.

API

Upload an Object

PUT /data/{repository}

Response

Status: 201 Created
{
  "oid": "2845f5a412dbdfacf95193f296dd0f5b2a16920da5a7ffa4c5832f223b03de96",
  "size": 1234
}

Download an Object

GET /data/{repository}/{objectID}

Response

Status: 200 OK
{object data}

Objects that are not on the server will return a 404 Not Found.

Delete an Object

DELETE /data/{repository}/{objectID}

Response

Status: 200 OK

Getting started and Testing

This exercise requires a recent version of Node.js. Get started by installing dependencies:

npm install

Write your server implementation in server.js. Then run the tests:

npm test

Or run them continuously as you work:

npm run test-watch

Once you have a working implementation, open a pull request that includes your changes.

Implementation details

GET request on this endpoint [http://localhost:3000/data/somerepo/file1] should return {"oid":"file1","size":123}

PUT request currently does not full work [http://0.0.0.0:3000/data/somerepo] pass this as raw - json { "object": "file1", "size": "125" }

DELETE [http://0.0.0.0:3000/data/somerepo/file1] will delete the object id -> file1 from the repository -> somerepo

The repositoryMap contains the repository name and the objects that are present in them. The objects are stored in the set to avoid duplicates.

The objectDataMap has the object name (filename/objectID) and the data(here size is the data).