Vapor is a web framework for Swift. It provides a beautifully expressive and easy to use foundation for your next website, API, or cloud project.

Take a look at some of the awesome stuff created with Vapor.

💻 Technincal Background

Vapor is built on SwiftNIO, which provide a great performance and a great way to handle asynchronous work on servers, with features like for Futures and Promises.

while it's already working good for vapor and other server frameworks , writing asynchronous code for vapor applications without swiftNIO will leave the developers with two options:

1- writing asynchronous code in the tradational way of callbacks and clousres 2- writing asynchronous code using the avaliable frameworks for RFP like RxSwift and Combine

using 2nd option seems a better idea since it would really fit in the environemnt, But for some reasons, as disuccssed here RxSwift won't be the best option because it's a big dependency

i believe, that combine is a better alternative, also swiftNIO is going to have better support for Combine

🧩 Combine Support

This's an expermintal fork from Vapor, with combine Support added to it.

func routes(_ app: Application) throws {
       
   app.get{ req -> EventLoopFuture<String> in
       
      return Just("AwesomePublisher").promise(on: req)
   }
}
   

or more complex usage will be:

func routes(_ app: Application) throws {
    
    
    app.get{ req -> EventLoopFuture<View> in //normal route in vapor 4
        
        Just("Awesome Combine Publisher") //Combine Publisher, could be any publisher like PassThroughPublisher, or AnyPublisher,
          
            .flatMap({ (value) -> AnyPublisher<String,Never>  in //flat map in Combine to process data
                return Just(value + "Some operation").eraseToAnyPublisher()
            })
            
            .promise(on: req) //Combine Publisher tranformed to EventLoopFuture
            
            .flatMap { (outputFromCombine) -> EventLoopFuture<View> in //Flat map in SwiftNIO to process data recieved to a view
                return req.view.render("index",outputFromCombine)
        }
        
    }
  }

📝 To-do

a lot of things can be done to have a better support for Combine and swiftNio, for example i would love to remove the usage of flatMap(SwiftNio) one, for better readability and less boilerplate code.