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Challenge 4

Welcome to challenge four of Fermyon’s Advent of Spin!

This fourth challenge won't introduce you to any new concepts or SDKs, but we don't want to solidify the mindset that working with WebAssembly as a target, using your existing languages and toolchains, mean you can leverage those mature eco-systems of packages and examples.

Note: Our backend uses existing crates for calculating the distance and converting to nautical miles. Don't over-think this one.

This challenge is to help the elves write their first utility for Santa's big round the world trip. They need a service that can detect the distance between two points, as described by longitude and latitude coordinates.

Spec

Note: Haversine formula has been used on the verifier to calculate the distance between two points.

Add a new service to your Spin application that can calculate the distance between two lat/long coordinates. The distance will be calculated in nautical miles, rounded to the closest .1 mile.

  • 33.76nm == 33.8nm
  • 33.94nm == 33.9nm
  • 33.44nm == 33.4nm

As always, if you need any assistance, you can join us in the Ferymon Discord.

Your application must:

  • Accept a JSON payload via POST request to /distance-latlong
    • Payload shape: { d1: { lat: 0f, long: 0f }, d2: { lat: 0f, long: 0f }}
  • Respond with the Content-Type: application/json header
    • Payload response: shape { distance: 0f }

Test

You can run our Hurl test suite with make test. Ensure you have hurl installed.

Submit

Enter your Fermyon Cloud endpoint as serviceUrl below and run the command

hurl -error-format long --variable serviceUrl="" submit.hurl