Swift in the Cloud

Talk given at AKIBA.swift on April 28, 2016.

In this talk, I go through the steps it takes to get a web server running in Swift. I go through some of the more popular frameworks that are available, and what I thought about them.

Transcript

1. AKIBA.SWIFT - APRIL 26, 2016 SWIFT IN THE CLOUD CAESAR WIRTH
2. CAESAR WIRTH CYBERAGENT, INC. > Current: AbemaTV > Swift since August 2014 > try! Swift Organizer and Speaker
5. STEPS TO SERVER SIDE SWIFT 1. Set up your Environment 2. Choose a Framework 3. Conform to Standards 4. Deploy!
6. 1. SET UP YOUR ENVIRONMENT!
7. Nothing is Stable So use tools to make it better > swiftenv > Swift Package Manager
8. SWIFTENV Swift Version Manager > Easily install latest releases and snapshots > Project Scoped: ./swift-version > chswift is probably OK too
9. SWIFTENV # Official Releases > swiftenv install 2.2 # Snapshots > swiftenv install DEVELOPMENT-SNAPSHOT-2016-04-12-a # Scoped > swiftenv local DEVELOPMENT-SNAPSHOT-2016-03-24-a > swiftenv global 2.2
10. SWIFT PACKAGE MANAGER Dependency Manager > Included in Swift Toolchain > Fetches and builds depencencies from git > Needs a Package.swift
11. SWIFT PACKAGE MANAGER - PACKAGE.SWIFT import PackageDescription let package = Package( name: "swift-api-server", dependencies: [ .Package(url: "https://github.com/user/server.git", majorVersion: 0, minor: 9) ] )
12. . !"" .build # $"" debug # $"" Build Files, Including Binary !"" Package.swift !"" Packages # $"" Downloaded Dependencies !"" Sources # !"" Module # # $"" Module Sources # $"" main.swift $"" Tests !"" Module # $"" Tests for Module $"" Test Files For Package
13. NEW IN SPM: swift build -X
14. NEW IN SPM: swift build -X Generates Xcode Project SPM ❤ Xcode My blog post post is deprecated
15. 2. CHOOSE A FRAMEWORK!
16. AWESOME-SWIFT#WEBSERVER - Aeon - Perfect - Curassow - Swifty-Server - Blackfish - swifter - Dynamo - SwiftyHTTP - Express - Swifton - Frank - Taylor - http4swift - Trevi - Kitura - Vapor - Kunugi - XcodeServerSDK - NetworkObjects - Zewo
18. 1. Perfect - 6,972⭐ 2. Vapor - 3,613⭐ 3. Kitura - 2,880⭐ 4. Zewo - 945⭐
19. PERFECT Easy setup Database Support: SQLite, MySQL, PostreSQL, MongoDB Uses Swifty Features Feature rich, but with boilerplate
20. // PerfectLib public protocol RequestHandler { func handleRequest(request: WebRequest, response: WebResponse) } // MyApp public func PerfectServerModuleInit() { RoutingHandler.registerGlobally() Routing.Routes["GET", "/users/{id}"] = { _ in return FetchUserHandler() } } class FetchUserHandler: RequestHandler { func handleRequest(request: WebRequest, response: WebResponse) { let user: String = response.urlVariables["id"] ?? "No User" response.appendBodyString("You selected user: \(user)") response.requestCompletedCallback() } }
21. KITURA Modular Database Support: Redis, CouchDB Good Documentation Lightweight Setup Good so far, looking forward to it
22. import Kitura let router = Router() router.get("/users/:user") { request, response, next in let user = request.params["user"] ?? "No User" do { response.status(HttpStatusCode.OK) response.send("You selected user: \(user)") try response.end() } catch { print("Error with request: \(error)") } } let server = HttpServer.listen(8090, delegate: router) Server.run() // Just runs the main run loop
23. ZEWO Server Set of Libraries Lots of modules More than just web APIs One-stop toolbox
24. import HTTPServer import Router let router = Router { route in route.get("/users/:user") { request in let user = request.pathParameters["user"] ?? "No User" return Response(body: "You selected user: \(user)") } } try Server(responder: router).start()
25. VAPOR Made with parts of Zewo Type-safe URL parameters Easy to work with My personal favorite !
26. import Vapor let app = Application() app.get("users", String.self) { request, user in return "You selected user: \(user)" } app.start(port: 8888)
27. Use whichever you like best !
28. 3. CONFORM TO STANDARDS!
29. Separate your APPLICATION From your SERVER
30. WEB SERVER GATEWAY INTERFACE > Python has WSGI > Ruby has Rack > Perl has PSGI > Swift has...
31. WEB SERVER GATEWAY INTERFACE > Nest > OpenSwift
32. NEST - Swift Web Server Gateway Interface - Minimal interface between web servers and web applications - Very Simple Spec
33. /// Represents a HTTP Header, Key and Value public typealias Header = (String, String) /// Represents a HTTP request or response body public protocol PayloadType { /// Returns the next byte in the payload mutating func next() -> [UInt8]? } /// Represents a HTTP Request public protocol RequestType { var method:String { get } var path:String { get } var headers:[Header] { get } var body: PayloadType? { get set } } /// Represents a HTTP Response public protocol ResponseType { var statusLine:String { get } var headers:[Header] { get } var body: PayloadType? { get set } } public typealias Application = RequestType -> ResponseType
34. OPENSWIFT - Open source cross project standards for Swift - Different project for different standards - S4 - HTTP Standards - C7 - Core Standards - D5 - Database Standards - Very Comprehensive Spec
36. STANDARDS == FLEXIBILITY
37. 4. DEPLOY!
38. DOCKER OR HEROKU
39. I've never actually used Docker !
40. HEROKU
41. DEPLOYING TO HEROKU 1. Download heroku-buildpack-swift 2. Set your swift-version 3. Create Procfile 4. Get port from command line 5. Push to Heroku!
42. 1 BUILDPACK SETUP # Install Heroku CLI. Also need to do login and stuff > brew install heroku-toolbelt # Set the buildpack for your application > heroku buildpacks:set https://github.com/kylef/heroku-buildpack-swift.git # Set the swift-version for this project > swiftenv local DEVELOPMENT-SNAPSHOT-2016-04-12-a # Create Procfile to fetch port from command line > echo "web: AKIBA.vapor --port=$PORT" > Procfile
43. 2 CONFIGURE PORT FROM ARGUMENTS // Process.valueFor() is a Vapor-provided method // Can also search through the `Process.arguments` array let portArg = Process.valueFor(argument: "port") ?? "8888" let port = Int(portArg) ... print("Running on port: \(port)") app.start(port: port)
44. 3 PUSH TO HEROKU > git commit -am "Prepare for Deploy" > git push heroku master
45. 4 PRAY
46. > curl http://akiba-swift-caesar.herokuapp.com/
47. > curl http://akiba-swift-caesar.herokuapp.com/ Hello, World!
49. THANK YOU!
50. FURTHER READING https://swiftenv.fuller.li/en/latest/ http://perfect.org/ https://github.com/IBM-Swift/Kitura http://vapor.qutheory.io/ https://github.com/nestproject https://github.com/open-swift http://www.zewo.io/
51. CAESAR WIRTH github.com/cjwirth twitter.com/cjwirth cjwirth.com AKIBA.SWIFT - APRIL 26, 2016