@swift-5.6.3
@preconcurrency import Foundation import FoundationNetworking enum RequestData { @TaskLocal static var requestId: UUID! @TaskLocal static var startDate: Date! } struct Response: Encodable { let user: User let subscription: StripeSubscription } struct User: Encodable { var id: Int } func fetchUser() async throws -> User{ let requestId = RequestData.requestId! defer { print(requestId, "databaseQuery", "isCancelled", Task.isCancelled )} print(requestId, "Making database query") try await Task.sleep(nanoseconds: 500_000_000) print(requestId, "Finished database query") return User(id: 42) } struct StripeSubscription: Encodable { var id: Int} func fetchSubscription() async throws -> StripeSubscription { let requestId = RequestData.requestId! defer { print(requestId, "networkRequest", "isCancelled", Task.isCancelled )} print(requestId, "Making network request") try await Task.sleep(nanoseconds: 500_000_000) print(requestId, "Finished network request") return .init(id: 1729) } func response(for request: URLRequest) async throws -> Data { let requestId = RequestData.requestId! let start = RequestData.startDate! defer { print(requestId, "Request finished in", Date().timeIntervalSince(start)) } Task { print(RequestData.requestId!, "Track analytics") } async let user = fetchUser() async let subscription = fetchSubscription() let jsonData = try await JSONEncoder().encode( Response( user: user, subscription: subscription ) ) return jsonData } RequestData.$requestId.withValue(UUID()) { RequestData.$startDate.withValue(Date()) { let task = Task { _ = try await response(for: .init(url: .init(string: "https://www.pointfree.co")!)) } Thread.sleep(forTimeInterval: 0.1) } } Thread.sleep(forTimeInterval: 5)
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