Devoxx 17 - Swift server-side

Plan1. Les Origines
2. État de l'art
3. Pourquoi l'utiliser ?
4. Swift Server dans la vraie vie
5. Évolutions
15

En 2015-16
1 versiontous les
2 mois 36

Un langage(presque)
ﬁnalisé
37

bibliothèques
tierces

44

Beaucoup de
bibliothèques
tierces
stables 45

SPM
swift package init
swift package fetch
swift package update
swift package generate-xcodeproj
57

Quelques images Docker
— swiftdocker/swift/
— ibmcom/kitura-ubuntu/
— zewo/todobackend/
62

Metriques de qualitéPour en savoir plus...
speakerdeck.com/viteinﬁnite/be-the-quality-you-want-
to-see-in-your-app-swift-edition
68

nuclide.io/docs/languages/swift/
71

Mémoire
Source: http://benchmarksgame.alioth.debian.org
85

L'application Serveur
1. Routing
2. Fichiers statiques
3. Proxy YouTube
4. Caching
91

Package.swi!
import PackageDescription
let package = Package(
name: "XebiaTV",
dependencies: [
.Package(url: "https://github.com/vapor/vapor.git",
majorVersion: 1,
minor: 5),
.Package(url: "https://github.com/vapor/redis-provider.git",
majorVersion: 1)
]
)
92

Router
import Foundation
import Vapor
let drop = Droplet()
let categoryController = CategoryController()
let youtubeController = YouTubeController()
drop.get("/categories", handler: categoryController.categories)
drop.get("/playlistItems", handler: youtubeController.playlistItems)
drop.get("/search", handler: youtubeController.search)
drop.get("/live", handler: youtubeController.live)
drop.get("/video", String.self, handler: youtubeController.video)
drop.run()
93

Fichiers statiques
import Foundation
import Vapor
import Core
import HTTP
final class CategoryController {
private let dataLoader = DataFile()
func categories(_ req: Request) throws -> ResponseRepresentable {
let fileBody = try dataLoader.load(path: drop.workDir + "Data/categories.json")
return Response(body: .data(fileBody))
}
}
94

Proxy YouTube
public final class YouTubeController {
// ...
func search(_ req: Request) throws -> ResponseRepresentable {
let query = "(googleApisBaseUrl)/search?key=(apiKey)&channelId=(channelId)"
return try drop.client.get(query)
}
}
95

// ...
public func video(_ req: Request, videoId: String) throws -> ResponseRepresentable {
let cacheKey = "video-(videoId)"
guard let cached = try cacheService.load(for: cacheKey) else {
let urls = try videoUrls(for: videoId)
try cacheService.save(node: urls, with: cacheKey, expiration: cacheExpiration)
return try JSON(node: urls)
}
return try JSON(node: cached)
}
private func videoUrls(for videoId: String) throws -> Node {
guard let urls = try LiveStreamerReader.read(videoId: videoId) else {
throw Error.noVideo
}
return Node(["urls": Node.array(urls)])
}
96

Intégration avec LiveStreamer
static func launch(_ command: String, args: [String] = []) throws -> Data {
#if os(Linux)
let task = Task()
#else
let task = Process()
#endif
let pipe = Pipe()
task.launchPath = command
task.arguments = args
task.standardOutput = pipe
task.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
task.waitUntilExit()
return data
}
97

Cache avec Redis
public protocol CacheService {
func load(for key: String) throws -> Node?
func save(node: Node, with key: String, expiration: TimeInterval) throws
}
public class RedisService : CacheService {
private let drop: Droplet
public init(drop: Droplet) throws {
try drop.addProvider(VaporRedis.Provider(config: drop.config))
self.drop = drop
}
public func load(for key: String) throws -> Node? {
return try drop.cache.get(key)
}
public func save(node: Node, with key: String, expiration: TimeInterval) throws {
try drop.cache.set(key, node)
if let redisCache = drop.cache as? RedisCache {
try redisCache.redbird.command("EXPIRE", params: [key, "(Int(expiration))"])
}
}
}
98

Build
$ swift build
Compile CLibreSSL xts128.c
Compile CLibreSSL x_x509a.c
Compile CLibreSSL xcbc_enc.c
Compile CLibreSSL x_spki.c
....
Compile Swift Module 'libc' (1 sources)
Compile Swift Module 'SocksCore' (15 sources)
Compile Swift Module 'Jay' (21 sources)
Linking CLibreSSL
Compile Swift Module 'Core' (28 sources)
Compile Swift Module 'Routing' (11 sources)
Compile Swift Module 'HTTPRouting' (5 sources)
Compile Swift Module 'TypeSafeRouting' (3 sources)
Compile Swift Module 'Cache' (3 sources)
Compile Swift Module 'Auth' (15 sources)
Compile Swift Module 'Vapor' (92 sources)
Compile Swift Module 'VaporRedis' (2 sources)
Compile Swift Module 'App' (6 sources)
99

Tests
class AppTests: XCTestCase {
// ... Create a StubCategoryController
func testCategoryRoute() throws {
let drop = try makeTestDroplet(categoryController: StubCategoryController())
let request = try Request(method: .get, uri: "/categories")
let response = try drop.respond(to: request)
let jsonBody = try JSON(bytes: response.body.bytes!)
XCTAssertEqual(jsonBody["categories"]?.string, "someCategory")
}
}
100

Cross platform
#if os(Linux)
import Glibc
#else
import Darwin
#endif
106

Swi! Package Manager Mess
swift package generate-xcodeproj
108

Tester c'est linker (?)
Undefined symbols for architecture x86_64:
"test2.test2.init () -> test2.test2", referenced from:
test2Tests.test2Tests.(testExample () -> ()).
(implicit closure #1) in test2Tests.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1
109

Peut-on
le déployer
en prod ?
115

Je suis
un développeur
iOS 120

Je suis
un développeur
Back 121

Be a
Be!er
Developer
beabe!er.ninja
124

Devoxx 17 - Swift server-side

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