Skip to content

Latest commit

 

History

History
68 lines (44 loc) · 4.32 KB

README.md

File metadata and controls

68 lines (44 loc) · 4.32 KB
Raw

Challenge 2 - 2023

Welcome to the second challenge of Fermyon’s Advent of Spin 2023! 🥳

This second challenge is more of an optimization challenge, where you get to apply your computer science skills.

You'll need to use

  • Spin CLI
  • Your favorite programming language supported in Spin
  • Serving JSON from an api

If this is your first time with Spin, Challenge 1 from 2022, is the perfect introduction to this yearly challenge.

This year the stakes are higher, and the challenges...more challenging. The Fermyon elves have decided to help Santa use Serverless WebAssembly for Santa's new web application. Your task is to help the elves get the project up and running before Christmas Eve.

The elves will hang out in the Fermyon Discord server, and can help answer questions along the way.

Spec

This time around, the elves need to help Santa prepare for his travel around the world with all of his presents. Now, we're all used to seeing Santa taking off in his sleigh with a huge sack of presents. But we all know that it's absolutely impossible for all of the presents to be handed out to children around the world, can fit in one load! So in reality, Santa obviously has to make multiple trips, but it's time consuming and the elves really want to help optimize the number of kids, Santa can reach on each trip. Now travel time is not an issue for Santa, with his hypersonic raindeers, so the main thing to consider is how do the elves load the sleigh, optimizing for the number of kids to reach, given the combined weight of presents to a single house, and the sleighs capacity.

You can write your application in ANY language that compiles to WebAssembly. To skip the boilerplate, use spin new and use one of our language templates.

The elves will use your application, by calling the root of you application, giving it an array of how many kids are in a given house, and to total weight of the presents for those kids. Your job is to tell the elves how many of those kids Santa can optimally reach in one load.

The body of the POST call to / will contain a JSON object which can look like this:

{
    "kids": [1, 4 , 5, 6, 3, 2, 7],
    "weight": [23, 45, 23, 43, 12, 32, 45],
    "capacity": 120
}

Capacity is the weight that sleigh can carry (excluding Santa 🎅🏻)

  • When posting, the elves expect an HTTP status code 200 to be returned. With a body detailing how many kids can be reached given the data set provided:
{
    "kids": 18
}
  • Also the header in the response should contain Content-Type: application/json

Note: The above data is an example, the data used when submitting will be different values, and length of arrays. But NOT huge! :-)

Test

You can run our Hurl test suite with hurl --test test.hurl, which will carry out tests, similar to what the elves will use you application for, when you submit it. Ensure you have hurl installed.

Submit

Once the application is deployed, enter the endpoint as serviceUrl below and run the command - e.g., https://x-mas.fermyon.app

Note: Do not add a trailing / to the serviceUrl.

hurl --error-format long --variable serviceUrl="https://x-mas.fermyon.app" submit.hurl

Remember, if you want to participate in the swag award, go here and check out how to participate.

Nobody Must Code Alone!

Please don't hesitate to reach out to the elves on Fermyon Discord server if you have any questions, they may be busy this time a year, but they are always ready to help and answer questions. This is a great opportunity to meet others in the community as well. We’ll also post on X/Twitter and LinkedIn, dropping some helpful resources and videos.

Remember there are prizes for each challenge. So it may be you, to whom the elves will deliver a nice award to.

Note: If you submit using Fermyon Cloud, we will contact you for any awards you may win. If you aren't using the Fermyon cloud to host your application, please reach out to the elves on Fermyon Discord to register your submission