Swift 5 migration: Make use of Result type

WireGuard/WireGuard/Tunnel/TunnelsManager.swift

@@ -33,7 +33,7 @@ class TunnelsManager {
         startObservingTunnelConfigurations()
     }
 
-    static func create(completionHandler: @escaping (WireGuardResult<TunnelsManager>) -> Void) {
+    static func create(completionHandler: @escaping (Result<TunnelsManager, TunnelsManagerError>) -> Void) {
         #if targetEnvironment(simulator)
         completionHandler(.success(TunnelsManager(tunnelProviders: MockTunnels.createMockTunnels())))
         #else
@@ -104,7 +104,7 @@ class TunnelsManager {
         }
     }
 
-    func add(tunnelConfiguration: TunnelConfiguration, onDemandOption: ActivateOnDemandOption = .off, completionHandler: @escaping (WireGuardResult<TunnelContainer>) -> Void) {
+    func add(tunnelConfiguration: TunnelConfiguration, onDemandOption: ActivateOnDemandOption = .off, completionHandler: @escaping (Result<TunnelContainer, TunnelsManagerError>) -> Void) {
         let tunnelName = tunnelConfiguration.name ?? ""
         if tunnelName.isEmpty {
             completionHandler(.failure(TunnelsManagerError.tunnelNameEmpty))
@@ -167,9 +167,15 @@ class TunnelsManager {
         let tail = tunnelConfigurations.dropFirst()
         add(tunnelConfiguration: head) { [weak self, tail] result in
             DispatchQueue.main.async {
-                let numberSuccessful = numberSuccessful + (result.isSuccess ? 1 : 0)
+                var numberSuccessfulCount = numberSuccessful
-                let lastError = lastError ?? (result.error as? TunnelsManagerError)
+                var lastError: TunnelsManagerError?
-                self?.addMultiple(tunnelConfigurations: tail, numberSuccessful: numberSuccessful, lastError: lastError, completionHandler: completionHandler)
+                switch result {
+                case .failure(let error):
+                    lastError = error
+                case .success:
+                    numberSuccessfulCount = numberSuccessful + 1
+                }
+                self?.addMultiple(tunnelConfigurations: tail, numberSuccessful: numberSuccessfulCount, lastError: lastError, completionHandler: completionHandler)
             }
         }
     }

WireGuard/WireGuard/UI/TunnelImporter.swift

@@ -16,10 +16,10 @@ class TunnelImporter {
             if url.pathExtension.lowercased() == "zip" {
                 dispatchGroup.enter()
                 ZipImporter.importConfigFiles(from: url) { result in
-                    if let error = result.error {
+                    switch result {
+                    case .failure(let error):
                         lastFileImportErrorText = error.alertText
-                    }
+                    case .success(let configsInZip):
-                    if let configsInZip = result.value {
                         configs.append(contentsOf: configsInZip)
                     }
                     dispatchGroup.leave()

WireGuard/WireGuard/UI/iOS/ViewController/MainViewController.swift

@@ -42,12 +42,10 @@ class MainViewController: UISplitViewController {
         TunnelsManager.create { [weak self] result in
             guard let self = self else { return }
 
-            if let error = result.error {
+            switch result {
+            case .failure(let error):
                 ErrorPresenter.showErrorAlert(error: error, from: self)
-                return
+            case .success(let tunnelsManager):
-            }
-            let tunnelsManager: TunnelsManager = result.value!
-
                 self.tunnelsManager = tunnelsManager
                 self.tunnelsListVC?.setTunnelsManager(tunnelsManager: tunnelsManager)
 
@@ -57,6 +55,7 @@ class MainViewController: UISplitViewController {
                 self.onTunnelsManagerReady = nil
             }
         }
+    }
 
 }
 

WireGuard/WireGuard/UI/iOS/ViewController/TunnelEditTableViewController.swift

@@ -127,10 +127,10 @@ class TunnelEditTableViewController: UITableViewController {
             } else {
                 // We're adding a new tunnel
                 tunnelsManager.add(tunnelConfiguration: tunnelConfiguration, onDemandOption: onDemandOption) { [weak self] result in
-                    if let error = result.error {
+                    switch result {
+                    case .failure(let error):
                         ErrorPresenter.showErrorAlert(error: error, from: self)
-                    } else {
+                    case .success(let tunnel):
-                        let tunnel: TunnelContainer = result.value!
                         self?.dismiss(animated: true, completion: nil)
                         self?.delegate?.tunnelSaved(tunnel: tunnel)
                     }

WireGuard/WireGuard/UI/iOS/ViewController/TunnelsListTableViewController.swift

@@ -264,9 +264,10 @@ extension TunnelsListTableViewController: QRScanViewControllerDelegate {
     func addScannedQRCode(tunnelConfiguration: TunnelConfiguration, qrScanViewController: QRScanViewController,
                           completionHandler: (() -> Void)?) {
         tunnelsManager?.add(tunnelConfiguration: tunnelConfiguration) { result in
-            if let error = result.error {
+            switch result {
+            case .failure(let error):
                 ErrorPresenter.showErrorAlert(error: error, from: qrScanViewController, onDismissal: completionHandler)
-            } else {
+            case .success:
                 completionHandler?()
             }
         }

WireGuard/WireGuard/UI/macOS/AppDelegate.swift

@@ -20,13 +20,11 @@ class AppDelegate: NSObject, NSApplicationDelegate {
 
         TunnelsManager.create { [weak self] result in
             guard let self = self else { return }
-            if let error = result.error {
+
+            switch result {
+            case .failure(let error):
                 ErrorPresenter.showErrorAlert(error: error, from: nil)
-                return
+            case .success(let tunnelsManager):
-            }
-
-            let tunnelsManager: TunnelsManager = result.value!
-
                 let statusMenu = StatusMenu(tunnelsManager: tunnelsManager)
                 statusMenu.windowDelegate = self
 
@@ -42,6 +40,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
                 self.statusItemController = statusItemController
             }
         }
+    }
 
     @objc func quit() {
         if let manageWindow = manageTunnelsWindowObject, manageWindow.attachedSheet != nil {

WireGuard/WireGuard/UI/macOS/ViewController/TunnelEditViewController.swift

@@ -247,16 +247,16 @@ class TunnelEditViewController: NSViewController {
             // We're creating a new tunnel
             self.tunnelsManager.add(tunnelConfiguration: tunnelConfiguration, onDemandOption: onDemandOption) { [weak self] result in
                 self?.setUserInteractionEnabled(true)
-                if let error = result.error {
+                switch result {
+                case .failure(let error):
                     ErrorPresenter.showErrorAlert(error: error, from: self)
-                    return
+                case .success(let tunnel):
-                }
-                let tunnel: TunnelContainer = result.value!
                     self?.dismiss(self)
                     self?.delegate?.tunnelSaved(tunnel: tunnel)
                 }
             }
         }
+    }
 
     @objc func handleDiscardAction() {
         delegate?.tunnelEditingCancelled()

WireGuard/WireGuard/ZipArchive/ZipArchive.swift

@@ -7,6 +7,7 @@ enum ZipArchiveError: WireGuardAppError {
     case cantOpenInputZipFile
     case cantOpenOutputZipFileForWriting
     case badArchive
+    case noTunnelsInZipArchive
 
     var alertText: AlertText {
         switch self {
@@ -16,6 +17,8 @@ enum ZipArchiveError: WireGuardAppError {
             return (tr("alertCantOpenOutputZipFileForWritingTitle"), tr("alertCantOpenOutputZipFileForWritingMessage"))
         case .badArchive:
             return (tr("alertBadArchiveTitle"), tr("alertBadArchiveMessage"))
+        case .noTunnelsInZipArchive:
+            return (tr("alertNoTunnelsInImportedZipArchiveTitle"), tr("alertNoTunnelsInImportedZipArchiveMessage"))
         }
     }
 }

WireGuard/WireGuard/ZipArchive/ZipImporter.swift

@@ -3,16 +3,8 @@
 
 import Foundation
 
-enum ZipImporterError: WireGuardAppError {
-    case noTunnelsInZipArchive
-
-    var alertText: AlertText {
-        return (tr("alertNoTunnelsInImportedZipArchiveTitle"), tr("alertNoTunnelsInImportedZipArchiveMessage"))
-    }
-}
-
 class ZipImporter {
-    static func importConfigFiles(from url: URL, completion: @escaping (WireGuardResult<[TunnelConfiguration?]>) -> Void) {
+    static func importConfigFiles(from url: URL, completion: @escaping (Result<[TunnelConfiguration?], ZipArchiveError>) -> Void) {
         DispatchQueue.global(qos: .userInitiated).async {
             var unarchivedFiles: [(fileBaseName: String, contents: Data)]
             do {
@@ -28,9 +20,9 @@ class ZipImporter {
                 }
 
                 if unarchivedFiles.isEmpty {
-                    throw ZipImporterError.noTunnelsInZipArchive
+                    throw ZipArchiveError.noTunnelsInZipArchive
                 }
-            } catch let error as WireGuardAppError {
+            } catch let error as ZipArchiveError {
                 DispatchQueue.main.async { completion(.failure(error)) }
                 return
             } catch {