The $100 hamburger is a phrase used to describe a recreational flight taken by pilots for the primary purpose of having a meal at a distant airport. The term is often used humorously to describe the high cost of general aviation, but it also represents the freedom and joy of flying for leisure.

Skylunch is a simple, non-blocking api built using Spring Webflux that, provided with an airport code, will return a detailed list of restaurants within a configurable radius.

The purpose of Skylunch is to help aviators find new and interesting destinations to elevate the enjoyment of their favorite hobby.

Skylunch is built using the following technologies:

• Kotlin
• Spring Webflux
• Redis OM Spring
• Spring for GraphQL

Data is stored with Redis using Redis OM Spring.

Upon receiving a request, Skylunch will search the Redis cache/db for a result before querying the external api. External api calls will then be cached in Redis for subsequent requests.

Geographical searches are performed using the built-in functions of Redis OM:

val restaurants = restaurantRepository.findByLocationNear(
    location,
    Distance(restaurantProperties.radius.toDouble(), Metrics.METERS),
)

Local results will also be checked for 'staleness' according to the configuration properties. Results that are older than the threshold age will be re-queried by external api.

As of version 0.5.1, a fully non-blocking application is not possible using the Redis OM. This is because Redis OM uses the Jedis library instead of the non-blocking Lettuce library to access Redis. Therefore, calls to the repository will be blocking.

The application exposes the /graphiql endpoint which can be used to test the application and explore the schema. Queries are then made via /graphql.

A typical http endpoint is also provided and can be used at /api/v1/search?code=<ICAO or IATA>. Example: /api/v1/search?code=lax.

The infrastructure and deployment are covered in their own Readme.