Hands-On Server-Side Web Development with Swift

Starting with the entry point

The main.swift file contains the entry point for helloWorld executable target:

// File: /helloWorld/main.swiftimport Foundationimport Kituraimport LoggerAPIimport HeliumLoggerimport Applicationdo {    HeliumLogger.use(LoggerMessageType.info) // [1]    let app = try App() // [2]    try app.run() // [3]} catch let error {    Log.error(error.localizedDescription) // [4]}

The do-catch loop in main.swift performs several operations:

1. Initializes Helium logger
2. Creates an application instance
3. Invokes the application instance's run() function
4. Catches any runtime errors

Kitura's runtime executes the App instance and its run() function to boot the server. Any errors encountered by the server will be caught in the do-catch loop ...