Swift Summit 2017: Server Swift State of the Union

Swift on the ServerState of the Union

Chris Bailey@Chris__Bailey

30-10-201707-1 1-201607-1 1-2016

Swift 3.0

Swift 3.0

Swift 3.0

Swift 3.0

Swift 3.0

Swift 3.0

IBM Cloud

IBM Cloud

DRINKS

SOAKSCOVE

RS

Server API Workgroup

0.1.0: Draft HTTP Server API

import Foundationimport HTTP

func hello(request: HTTPRequest, response: HTTPResponseWriter ) -> HTTPBodyProcessing { response.writeHeader(status: .ok) response.writeBody("Hello, World!") response.done() return .discardBody}

let server = HTTPServer()try! server.start(port: 8080, handler: hello)

RunLoop.current.run()

0.1.0: Draft HTTP Server API





0.1.x: Draft HTTP Server API

0.2.x: Draft TLS support for HTTPS





0.1.x: Draft HTTP Server API

0.2.x: Draft TLS support for HTTPS

We need to talk About Foundation

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100 Foundation: • ~1,700 APIs

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Used on GitHub in: • 39.7% of all Obj-C files that import

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Used on GitHub in: • 39.7% of all Obj-C files that import

• 90.7% of all Swift files that import

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Open Source

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Open Source

Swift 3.0

Sho Ikeda@ikesyo

Ian Partridge @ianpartridge

Pushkar N Kulkarni @pushkarnk

Bartek Chlebek @bubski

David Dunn @ddunn2

John Holdsworth @johnno1962

Philippe Hausler @phausler

Alex Blewitt @alblue

Simon Evans @spevans

Sergey Minakov @naithar

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Open Source

Swift 3.0

Sho Ikeda@ikesyo




David Dunn @ddunn2






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Open Source

Swift 3.0

Sho Ikeda@ikesyo




David Dunn @ddunn2






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Open Source

Swift 3.0




David Dunn @ddunn2






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Sho Ikeda@ikesyo

Open Source

Swift 3.0




David Dunn @ddunn2





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Sho Ikeda@ikesyo


Open Source

Swift 3.0



David Dunn @ddunn2





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Sho Ikeda@ikesyo



Open Source

Swift 3.0



David Dunn @ddunn2




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Sho Ikeda@ikesyo




Open Source

Swift 3.0



David Dunn @ddunn2




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Sho Ikeda@ikesyo




Mamatha Busi @mamabusi

Nethra Ravindran @nethraravindran

Open Source

Swift 3.0

Sho Ikeda@ikesyo




David Dunn @ddunn2






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Mamatha Busi @mamabusi

Nethra Ravindran @nethraravindran

Open Source

Swift 3.0

Today

Commercial Support for Swift on Linux

from


from


IBM Cloud

from

Commercial Support for Kitura Ecosystem

from

Commercial Support for Kitura Ecosystem

from

IBM Cloud

07-1 1-2016

“Software interop is hard” —Rocket Scientists

Deploy Deploy

Deploy DeployGenerate

{ "name": "", "photo": "", "dateOfBirth": ""}

{ "name": "", "photo": "", "dateOfBirth": { "year": "month": "day": }}

struct Profile { var name: String var photo: Data var dateOfBirth: Date}

Swift

var profile: [String : Any]

Swift

Codable

let json = JSON(data: data) guard json["name"].exists() else { response.status(.unprocessableEntity) response.send(json: JSON([ "error": "Missing reqired property `name`" ])) next() } guard let name = json["name"].string else { response.status(.unprocessableEntity) response.send(json: JSON([ "error": "Type mismatch, `name` expected to be a String" ])) next() } guard json["photo"].exists() else { response.status(.unprocessableEntity) response.send(json: JSON([ "error": "Missing reqired property photo`" ])) next() } guard let photoString = json[“photo"].string else { response.status(.unprocessableEntity) response.send(json: JSON([ "error": "Type mismatch, `photo` expected to be a String" ])) next() } guard let photo = Data(base64Encoded: photoString) else { response.status(.unprocessableEntity) response.send(json: JSON([ "error": "Type mismatch, `photo` expected to be Base64 encoded data" ])) next() } let profile = Profile(name: name, photo: photo)

var profile: Profile do { var data = Data() _ = try request.read(into: &data) profile = try JSONDecoder().decode(Profile.Type, from: data) } catch let error { response.status(.unprocessableEntity) response.send(try JSONEncoder().encode(error)) next() }

var profile: Profile do { profile = try request.read(as: Profile.self) } catch let error { response.status(.unprocessableEntity) response.send(try JSONEncoder().encode(error)) next() }

var profile: Profile do { profile = try request.read(as: Profile.self) } catch let error { response.status(.unprocessableEntity) response.send(error) next() }

router.post,(“/profile", handler: storeProfile)

func storeProfile(request: RouterRequest, response: RouterResponse, next: @escaping () -> Void) { guard let contentType = request.headers["Content-Type"], contentType.hasPrefix("application/json") else { response.status(.unsupportedMediaType) response.send(error) return next() }

var profile: Profile do { profile = try request.read(as: Profile.self) } catch let error { response.status(.unprocessableEntity) response.send(error) next() } ... }




Web Request




Web RequestWeb Response





Next ??





Next ??

Validate and Convert parameters

3/10

func store(profile: Profile, respondWith: @escaping (Profile?, Error?) -> Void) -> Void {

... }


... }

Swift Type


... }

Swift Type

Completion Handler

Codable Routing


... }


... }

Swift Type (Codable)


... }


Swift Type (RequestError)


... }

func get(profile id: Int, respondWith: @escaping (Profile?, Error?) -> Void) -> Void {

... }




... }


... }


Swift Type (Identifier)



... }


... }

func delete(profile id: Int, respondWith: @escaping (Error?) -> Void) -> Void {

... }





... }


... }

func delete(profile id: Int, respondWith: @escaping (Error?) -> Void) -> Void {

... }

router.post("/profile", handler: store)router.get("/profile", handler: get)router.delete("/profile", handler: delete)




Deploy Deploy

Deploy Deploy

Client/Server Contract

KituraKit

guard let backend = KituraKit(baseURL: "http://localhost:8080") else { print("Error creating KituraKit client") return}


backend.post("/profile", data: profile) { (profile: Profile?, error: RequestError?) in ...

}



} Swift Type (Codable)



} Swift Type (Codable)


Kitura 2.0

The Future

Optimized Transports

Optimized Transports Implicit Security


User Domains

API Protocols


User Domains

public struct ToDoItem : Codable { public var user: String public var title: String public var order: Int public var completed: Bool}


Client Server


public protocol todoStoreAPI: Store, Get, Update, Index, Delete { typealias In, Out = ToDoItem typealias Id = Int}


Client Server



class ToDoBackend: APIController, ToDoAPI { func store(_ item: ToDoItem, completion: …) { } func get(_ id: Int, completion: …) { } func update(_ id: Int, _ item: ToDoItem completion: …) { } func index(completion: …) { } func delete(_ id: Int, completion: …) { } }

router.registerAPI(api: ToDo())


Client Server






Client Server

User provided implementation



class ToDoBackend: APIController, ToDoAPI {

}




Client Server





}




KituraKit provides implementation

Client Server





}

let backend = ToDoBackend()

backend.store(data: item) { id?, created?, error? in print(id!)}backend.get(id: id) { todo, err in print(todo!.title)}




KituraKit provides implementation

Client Server


Swift on the ServerThe Future, available Today