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通信処理を差し替えてみた話
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Tatsuya Tanaka
February 15, 2017
Technology
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2.5k
通信処理を差し替えてみた話
URLProtocolとMethod Swizzlingの話
#potatotips 37
Tatsuya Tanaka
February 15, 2017
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Transcript
௨৴ॲཧΛࠩ͠ସ͑ͯΈͨ
ࣗݾհ • ాதୡ (@tattn) • Ϡϑʔͷ2016৽ଔ
Qiitaͱ͔Twitterͱ͔ͬͯ·͢ • ։ൃ͕രʹͳΔSwift༻XcodeϓϥάΠϯΛ·ͱΊͯΈͨ • ͏ͱख์ͤͳ͘ͳΔSwift Extensionू (Swift3൛) @tanakasan2525
APIͷϢχοτςετͲ͏ͯ͠·͢ ͔ʁ
DIʁ ϥΠϒϥϦʁ
MockingjayศརͰ͢ΑͶ
Mockingjay https://github.com/kylef/Mockingjay let body = [ "user": "Kyle" ] stub(uri("/{user}/{repository}"),
json(body))
Ͳ͏͍͏ΈͰಈ͍ͯΔΜͩΖ͏ !
ௐͯΈΔͱ
URLProtocolͱMethod Swizzling Λͬͯ௨৴ॲཧΛࠩ͠ସ͍͑ͯ·͠ ͨ
URLProtocol https://developer.apple.com/reference/foundation/urlprotocol αϙʔτ֎ͷϓϩτίϧͰ௨৴͢Δ߹ ϦΫΤετΛಠࣗͷํ๏Ͱॲཧ͢Δ࣌ʹ͏Ϋϥεɻ
Mock༻ͷURLProtocol public class MockURLProtocol: URLProtocol { override open func startLoading()
{ let jsonString = "{\"mock\": \"data\"}" let json = jsonString.data(using: .utf8)! self.client?.urlProtocol(self, didLoad: json) self.client?.urlProtocolDidFinishLoading(self) } // ͦͷଞϝιουলུ }
Method SwizzlingͰϞοΫ༻ͷURLProtocol ʹࠩ͠ସ͑ public extension URLSessionConfiguration { public class func
setup() { let `default` = class_getClassMethod(URLSessionConfiguration.self, #selector(getter: URLSessionConfiguration.default)) let swizzled = class_getClassMethod(URLSessionConfiguration.self, #selector(getter: URLSessionConfiguration.mock)) method_exchangeImplementations(`default`, swizzled) } private dynamic class var mock: URLSessionConfiguration { let configuration = self.mock configuration.protocolClasses?.insert(MockURLProtocol.self, at: 0) URLProtocol.registerClass(MockURLProtocol.self) return configuration } }
ֶ͔ͤͬ͘ΜͩͷͰϥΠϒϥϦԽ͠· ͨ͠ !
Replacer https://github.com/tattn/Replacer ௨৴ͷελϒԽMethod SwizzlingΛαϙʔτ͢ΔϥΠϒϥϦ
Method ChainͰΦϓγϣϯΛઃఆ͠·͢ self.urlStub .url("echo.jsontest.com/[a-z]+/.*") .httpMethod(.post) .json(["test": "data"]) .delay(1.5)
QuickͱAlamofireͰͷελϒԽ describe("Quick compatibility test") { it("returns mock data") { let
url = "http://echo.jsontest.com/key/value/one/two" var json: [String: String]? Alamofire.request(url, method: .post).responseJSON { response in json = response.result.value as? [String: String] } expect(json?["test"]).toEventually(equal("data")) } }
ओͳػೳ • ௨৴ͷελϒԽ • XCTestҎ֎ (Host ApplicationؚΉ) Ͱ༻Մೳ • Method
Swizzlingͷαϙʔτػೳ ͳͲͰ͢ɻ
ྑ͔ͬͨΒͬͯΈ͍ͯͩ͘͞ ! (ʁʁ)ʻ ܅⭐͕େ͖ͳϑϨϯζͳΜͩͶʂ
͋ɺͦ͏͍͑ɺɺɺ
࡞͍ͬͯΔ࣌ʹSwiftͷόάʹؾ͕͖·ͨ͠ ڥ: Xcode 8.2, Swift 3.0.2
άϩʔόϧఆٛ͞ΕͨؔʹϞδϡʔϧ໊Λ͚ Δͱɺ@discardableResult͕ਖ਼ৗʹಈ࡞͠ͳ͍
ઌఔௐͯΈΔͱɺमਖ਼͞ΕͨΈ͍ͨͰ͢ ! https://bugs.swift.org/browse/SR-3665 Fix @discardableResult when invoking function with explicit
namespace #7201
SwiftͷਐԽɾվળࢭ ·Βͳ͍Ͱ͢Ͷʂ !
͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝ ·ͨ͠ʂ