Going Server-Side with Swift

Transcript

1. Going Server-Side with Swift Ian Partridge 1st June 2017
2. 2 Ian Partridge • Team leader in Swift@IBM engineering • Background in runtime systems • Java garbage collection • Runtime performance analysis • Full-stack debugging • Swift@IBM @ianpartridge @alfa
3. 3 Today • Open source Swift • Swift on the Server • Kitura web framework • Emerging architecture patterns • Deploying Swift to the cloud
4. Open Source Swift 4 www.swift.org www.github.com/apple/swift
5. Open, inclusive development community 5 GitHub Satellite 2016 https://youtu.be/DoQiiE5oNOU?t=9m
6. Building on the shoulders of giants 6
7. Language evolution process https://apple.github.io/swift-evolution/
8. IBM Swift Sandbox • Interactive sandbox for exploring Swift • Saves your work • Supports multiple versions of Swift • Deploys your Swift code in a Linux Docker container 8 https://swiftlang.ng.bluemix.net/
9. WWDC 2016 4
10. Kitura Web Framework http://github.com/IBM-Swift/Kitura 10 • Open source web framework for Swift on macOS and Linux • Inspired by Express for Node.js • Flexible routing • Pluggable middlewares • Easy to deploy
11. Growing server-side ecosystem 11 https://medium.com/@rymcol/current-features-benefits-of-the-top-server-side-swift-frameworks-b15b4f2d7bc3
12. Trusted, permissive licence • Apache Software Licence v2.0 • Third most popular OSS licence • After MIT, GPLv2 • Includes patent licence requirements • Trusted by community and industry 12
13. Kitura Architecture 13 Web Framework Web Framework Source C Helpers & Interfaces Swift Libraries SwiftyJSON SwiftMongoDB Swift Binary Foundation Package Manager C Libraries Dispatch HttpParser HiRedis CURL PCRE2 Pluggable Components
14. Apple Client Deployment Server/Cloud Deployment Application-Specific Cloud Services Client Facing App Bringing Swift to the Server Foundation Swift Swift Standard Library Core Foundation Dispatch PWQ C libs GLibc Foundation Swift Swift Standard Library Core Foundation Dispatch Darwin C libs Client-specific Libraries App Libraries Server-specific Libraries App Libraries Driving Towards Consistent Runtime across Clients/Servers Server-side Environments (Built with Foundation & Libdispatch)
15. Why Swift on the server? • Runtime characteristics • Performance – Compiled, no JIT • Memory usage – ARC, not a tracing GC • Developer experience • Isomorphic Development • Fun! 15
16. Swift Performance
17. Swift Memory Usage
18. Swift Performance by Memory
19. Why does this matter? GB/hr 19
20. Developing a Kitura web application 20 myProject ├── Package.swift ├── Sources │ └── main.swift └── Tests $ mkdir myProject && cd myProject 2. Next, initialize this project as a new Swift package 1. First, we create a new project directory $ swift package init --type executable Basic Swift package directory structure:
21. Developing a Kitura web application 21 import PackageDescription let package = Package( name: "myProject", dependencies: [ .Package(url: "https://github.com/IBM-Swift/Kitura.git", majorVersion: 1, minor: 7) ] ) 3. Add Kitura as a dependency for your project (Package.swift):
22. Developing a Kitura web application 22 Kitura.addHTTPServer(onPort: 8090, with: router) Kitura.run() let router = Router() router.get("/hello") { request, response, next in response.status(.OK).send("<h1>Hello, World!</h1>").end() } 6. Create and start an HTTPServer: 4. Add a router and a path: router.get("/hello.json") { request, response, next in response.status(.OK).send(json: JSON(["Hello": "World!"])).end() } 5. Add a JSON data route
23. Adding features 23 • Templating • Mustache or Stencil • Static file serving • Custom middlewares • Implemented via a simple protocol • TLS • WebSockets
24. Adding authentication via OAuth 2.0 • HTTP Basic/Digest Auth • https://github.com/IBM-Swift/Kitura-CredentialsHTTP • Facebook • https://github.com/IBM-Swift/Kitura-CredentialsFacebook • Google • https://github.com/IBM-Swift/Kitura-CredentialsGoogle • GitHub • https://github.com/IBM-Swift/Kitura-CredentialsGitHub • Twitter • https://github.com/jacobvanorder/Kitura-CredentialsTwitter (Thanks!) 24
25. Adding a NoSQL backend Apps need persistence – we can help you! • Apache Cassandra • https://github.com/IBM-Swift/Kassandra • Redis • https://github.com/IBM-Swift/Kitura-redis • CouchDB • https://github.com/IBM-Swift/Kitura-CouchDB 25
26. Backend Abstraction with Kuery class T1 { let tableName = "t1" let a = Column("a") let b = Column("b") } 26
27. Kuerying SELECT * FROM t1; let t1 = T1() let s = Select(from: t1) s.execute(connection) { queryResult in if let resultSet = queryResult.asResultSet { for title in resultSet.titles { ... } for row in resultSet.rows { for value in row { ... } } } else if let queryError = result.asError { ... } } 27
28. Kuerying continued SELECT UCASE(a) AS name FROM t1 WHERE b >= 0 GROUP BY a HAVING SUM(b) > 3 ORDER BY a DESC; … let s = Select(ucase(t1.a).as("name"), from: t1) .where(t1.b >= 0) .group(by: t1.a) .having(sum(t1.b) > 3) .order(by: .DESC(t1.a)) … 28
29. Future Work • SMTP for email • Socket.io for realtime • SOAP for… 29
48. Server-Side Swift: The Book 48 • Take your new skills to the next level • Step by step tutorials • Written by acclaimed Swift author Paul Hudson @twostraws https://www.hackingwithswift.com
49. Find out more 49 https://developer.ibm.com/swift/ The Swift@IBM devCenter Join IBM Swift Engineering and learn the latest news