FrenchKit - Swift Superpowers #2

What swift can offer outside of Apple platforms?

This part is about swift NIO and code sharing between platforms.

Transcript

1. Swift Superpowers hello (again) 8th October 2019 David Bonnet - @iGranDav
2. performant cross-platform networking library wait! Apple's platforms right? you get !
3. swift server
4. swift server swift NIO (Non-blocking I/O) https://github.com/apple/swift-nio
5. using vapor 3 // GET /talks func getAll(_ req: Request) throws -> Future<[Talk]> { return Talk.query(on: req).all() } swift-NIO
6. using vapor 3 // GET /talks func getAll(_ req: Request) throws -> Future<[Talk]> { return Talk.query(on: req).all() } swift-NIO
7. using vapor 3 // GET /talks func getAll(_ req: Request) throws -> Future<[Talk]> { return Talk.query(on: req).all() } swift-NIO used on database events handling and querying
8. using vapor 3 // GET /talks func getAll(_ req: Request) throws -> Future<[Talk]> { return Talk.query(on: req).all() } swift-NIO used on database events handling and querying dotSwift 2019 Implementing JSON-RPC with swift NIO by Tom Doron (Apple) http tcp udp http/2 BoringSSL
9. share network code between your client & server you can ! network is a thing already! Could we do more?
10. swift server swift NIO
11. swift server swift NIO macOS, iOS, tvOS, watchOS
12. swift server swift NIO https://github.com/apple/swift-nio-transport-services macOS, iOS, tvOS, watchOS Transport services uses Network.framework and Dispatch
13. swift server swift NIO https://github.com/apple/swift-nio-transport-services macOS, iOS, tvOS, watchOS Transport services uses Network.framework and Dispatch #
14. //Create the run loop let group = MultiThreadedEventLoopGroup(numberOfThreads: 1) defer { try! group.syncShutdownGracefully() } //Bootstrap a connexion let bootstrap = ClientBootstrap(group: group) .channelInitializer { channel in channel.pipeline.addHTTPClientHandlers( position: .first, leftOverBytesStrategy: .fireError ).flatMap { channel.pipeline.addHandler(HTTPFrenchKitHandler()) } } //Connect and wait let channel = try bootstrap.connect(host: "httpbin.org", port: "443") try channel.closeFuture.wait() swift-NIO http client https://github.com/apple/swift-nio/blob/master/Sources/NIOHTTP1Client/main.swift
15. private final class HTTPFrenchKitHandler: ChannelInboundHandler { public typealias InboundIn = HTTPClientResponsePart public typealias OutboundOut = HTTPClientRequestPart public func channelActive(context: ChannelHandlerContext) { // We are connected. var headers = HTTPHeaders() headers.add(name: "Accept", value: "application/json") let version = HTTPVersion(major: 1, minor: 1) let requestHead = HTTPRequestHead(version: version, method: .GET, uri: "/get", headers: headers) context.write(self.wrapOutboundOut(.head(requestHead)), promise: nil) context.writeAndFlush(self.wrapOutboundOut(.end(nil)), promise: nil) } swift-NIO http client https://github.com/apple/swift-nio/blob/master/Sources/NIOHTTP1Client/main.swift
16. //Handle received data public func channelRead(context: ChannelHandlerContext, data: NIOAny) { let clientResponse = self.unwrapInboundIn(data) switch clientResponse { case .head(let responseHead): print("Received status: \(responseHead.status)") case .body(var byteBuffer): break //Handle body when needed case .end: context.close(promise: nil) //Close channel } } //Handle errors public func errorCaught(context: ChannelHandlerContext, error: Error) { print("error: ", error) context.close(promise: nil) } swift-NIO http client https://github.com/apple/swift-nio/blob/master/Sources/NIOHTTP1Client/main.swift
17. %
18. # Foundation now implements URLSession cross-platform https://github.com/apple/swift-corelibs-foundation/tree/master/Foundation/URLSession
19. import Foundation #if canImport(FoundationNetworking) import FoundationNetworking #endif let url = URL(string: "https://httpbin.org/get")! let session = URLSession(configuration: .default) let task = session.dataTask(with: url) { data, _, _ in guard let data = data, let response = String(data: data, encoding: .utf8) else { return } print(response) } task.resume() Foundation Networking
20. import Foundation #if canImport(FoundationNetworking) import FoundationNetworking #endif let url = URL(string: "https://httpbin.org/get")! let session = URLSession(configuration: .default) let task = session.dataTask(with: url) { data, _, _ in guard let data = data, let response = String(data: data, encoding: .utf8) else { return } print(response) } task.resume() Foundation Networking https://forums.swift.org/t/foundationnetworking/24769
21. &
22. & '
23. & ' 1. JSONEncoder 2. Networking 3. JSONDecoder
24. & '
25. & ' Models.framework
26. Wanna try? there is a classroom for that : please come and say hi David Bonnet - @iGranDav