Fix various small errors when running in the Swift 6 language mode (#4109)

* Fix various small errors when running in the Swift 6 language mode

* Make the `TargetConfiguration` run on the main actor.

* Fixed a comment

* Add a comment as to why we can't make the whole NSE a main actor.

* Fix the unit tests

* Fix `blankLinesAtStartOfScope` swiftformat error.

ElementX/Sources/Application/TargetConfiguration.swift

@@ -7,6 +7,7 @@
 
 import MatrixRustSDK
 
+@MainActor
 enum Target: String {
     case mainApp = "elementx"
     case nse

ElementX/Sources/Other/ExpiringTaskRunner.swift

@@ -11,7 +11,7 @@ enum ExpiringTaskRunnerError: Error {
     case timeout
 }
 
-actor ExpiringTaskRunner<T> {
+actor ExpiringTaskRunner<T: Sendable> {
     private var continuation: CheckedContinuation<T, Error>?
     
     private var task: () async throws -> T

ElementX/Sources/Other/HTMLParsing/ElementXAttributeScope.swift

@@ -9,34 +9,34 @@ import Foundation
 
 enum BlockquoteAttribute: AttributedStringKey {
     typealias Value = Bool
-    static var name = "MXBlockquoteAttribute"
+    static let name = "MXBlockquoteAttribute"
 }
 
 enum UserIDAttribute: AttributedStringKey {
     typealias Value = String
-    static var name = "MXUserIDAttribute"
+    static let name = "MXUserIDAttribute"
 }
 
 /// This attribute is used to help the composer convert a mention into to a markdown link before sending
 /// the message. It doesn't interact mention pills, as these fetch display names live from the room.
 enum UserDisplayNameAttribute: AttributedStringKey {
     typealias Value = String
-    static var name = "MXUserDisplayNameAttribute"
+    static let name = "MXUserDisplayNameAttribute"
 }
 
 enum RoomDisplayNameAttribute: AttributedStringKey {
     typealias Value = String
-    static var name = "MXRoomDisplayNameAttribute"
+    static let name = "MXRoomDisplayNameAttribute"
 }
 
 enum RoomIDAttribute: AttributedStringKey {
     typealias Value = String
-    static var name = "MXRoomIDAttribute"
+    static let name = "MXRoomIDAttribute"
 }
 
 enum RoomAliasAttribute: AttributedStringKey {
     typealias Value = String
-    static var name = "MXRoomAliasAttribute"
+    static let name = "MXRoomAliasAttribute"
 }
 
 enum EventOnRoomIDAttribute: AttributedStringKey {
@@ -45,7 +45,7 @@ enum EventOnRoomIDAttribute: AttributedStringKey {
         let eventID: String
     }
     
-    static var name = "MXEventOnRoomIDAttribute"
+    static let name = "MXEventOnRoomIDAttribute"
 }
 
 enum EventOnRoomAliasAttribute: AttributedStringKey {
@@ -54,12 +54,12 @@ enum EventOnRoomAliasAttribute: AttributedStringKey {
         let eventID: String
     }
     
-    static var name = "MXEventOnRoomAliasAttribute"
+    static let name = "MXEventOnRoomAliasAttribute"
 }
 
 enum AllUsersMentionAttribute: AttributedStringKey {
     typealias Value = Bool
-    static var name = "MXAllUsersMentionAttribute"
+    static let name = "MXAllUsersMentionAttribute"
 }
 
 // periphery: ignore - required to make NSAttributedString to AttributedString conversion even if not used directly

ElementX/Sources/Other/Logging/MXLog.swift

@@ -9,13 +9,11 @@
 import Foundation
 import MatrixRustSDK
 
-/**
+/// Logging utility that provies multiple logging levels as well as file output and rolling.
- Logging utility that provies multiple logging levels as well as file output and rolling.
+/// Its purpose is to provide a common entry for customizing logging and should be used throughout the code.
- Its purpose is to provide a common entry for customizing logging and should be used throughout the code.
- */
 enum MXLog {
-    private static var rootSpan: Span!
+    private nonisolated(unsafe) static var rootSpan: Span!
-    private static var currentTarget: String!
+    private nonisolated(unsafe) static var currentTarget: String!
     
     static func configure(currentTarget: String) {
         self.currentTarget = currentTarget

ElementX/Sources/Other/MatrixEntityRegex.swift

@@ -32,12 +32,12 @@ enum MatrixEntityRegex: String {
     }
     
     // swiftlint:disable force_try
-    static var homeserverRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.homeserver.rawValue, options: .caseInsensitive)
+    static let homeserverRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.homeserver.rawValue, options: .caseInsensitive)
-    static var userIdentifierRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.userID.rawValue, options: .caseInsensitive)
+    static let userIdentifierRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.userID.rawValue, options: .caseInsensitive)
-    static var roomAliasRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.roomAlias.rawValue, options: .caseInsensitive)
+    static let roomAliasRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.roomAlias.rawValue, options: .caseInsensitive)
-    static var uriRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.uri.rawValue, options: .caseInsensitive)
+    static let uriRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.uri.rawValue, options: .caseInsensitive)
-    static var allUsersRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.allUsers.rawValue)
+    static let allUsersRegex = try! NSRegularExpression(pattern: MatrixEntityRegex.allUsers.rawValue)
-    static var linkRegex = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
+    static let linkRegex = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
     // swiftlint:enable force_try
     
     static func isMatrixHomeserver(_ homeserver: String) -> Bool {

ElementX/Sources/Screens/EmojiPickerScreen/EmojiPickerScreenViewModel.swift

@@ -55,7 +55,6 @@ class EmojiPickerScreenViewModel: EmojiPickerScreenViewModelType, EmojiPickerScr
     
     private func convert(emojiCategories: [EmojiCategory]) -> [EmojiPickerEmojiCategoryViewData] {
         emojiCategories.compactMap { emojiCategory in
-            
             let emojisViewData: [EmojiPickerEmojiViewData] = emojiCategory.emojis.compactMap { emojiItem in
                 EmojiPickerEmojiViewData(id: emojiItem.id, value: emojiItem.unicode)
             }

ElementX/Sources/Services/Media/Provider/MediaFileHandleProxy.swift

@@ -6,11 +6,12 @@
 //
 
 import Foundation
-import MatrixRustSDK
+
+@preconcurrency import MatrixRustSDK
 
 /// A wrapper around Rust's `MediaFileHandle` type that provides us with a
 /// media file that is stored unencrypted in a temporary location for previewing.
-class MediaFileHandleProxy {
+final class MediaFileHandleProxy: Sendable {
     /// The underlying handle for the file.
     private let handle: MediaFileHandleProtocol
     

ElementX/Sources/Services/Media/Provider/MediaLoader.swift

@@ -7,9 +7,10 @@
 
 import Combine
 import Foundation
-import MatrixRustSDK
 import UIKit
 
+@preconcurrency import MatrixRustSDK
+
 private final class MediaRequest {
     var continuations: [CheckedContinuation<Data, Error>] = []
 }

ElementX/Sources/Services/Media/Provider/MediaSourceProxy.swift

@@ -6,9 +6,9 @@
 //
 
 import Foundation
-import MatrixRustSDK
+@preconcurrency import MatrixRustSDK
 
-struct MediaSourceProxy: Hashable {
+struct MediaSourceProxy: Hashable, Sendable {
     /// The media source provided by Rust.
     let underlyingSource: MediaSource
     /// The media's mime type, used when loading the media's file.

NSE/Sources/NotificationServiceExtension.swift

@@ -27,16 +27,18 @@ import UserNotifications
 // called on the same instance of `NotificationService` as a previous
 // notification.
 
-private let settings: CommonSettingsProtocol = AppSettings()
-
-private let keychainController = KeychainController(service: .sessions,
-                                                    accessGroup: InfoPlistReader.main.keychainAccessGroupIdentifier)
-
 class NotificationServiceExtension: UNNotificationServiceExtension {
     private var notificationHandler: NotificationHandler?
     
     private let appHooks = AppHooks()
     
+    private let settings: CommonSettingsProtocol = AppSettings()
+
+    private let keychainController = KeychainController(service: .sessions,
+                                                        accessGroup: InfoPlistReader.main.keychainAccessGroupIdentifier)
+    
+    // We can make the whole NSE a MainActor after https://github.com/swiftlang/swift-evolution/blob/main/proposals/0371-isolated-synchronous-deinit.md
+    // otherwise we wouldn't be able to log the tag in the deinit.
     deinit {
         ExtensionLogger.logMemory(with: tag)
         MXLog.info("\(tag) deinit")
@@ -61,7 +63,8 @@ class NotificationServiceExtension: UNNotificationServiceExtension {
             return contentHandler(request.content)
         }
         
-        Target.nse.configure(logLevel: settings.logLevel, traceLogPacks: settings.traceLogPacks)
+        Task {
+            await Target.nse.configure(logLevel: settings.logLevel, traceLogPacks: settings.traceLogPacks)
             
             MXLog.info("\(tag) #########################################")
             
@@ -69,7 +72,6 @@ class NotificationServiceExtension: UNNotificationServiceExtension {
             
             MXLog.info("\(tag) Received payload: \(request.content.userInfo)")
             
-        Task {
             do {
                 let userSession = try await NSEUserSession(credentials: credentials,
                                                            roomID: roomID,

UnitTests/Sources/LoggingTests.swift

@@ -22,7 +22,7 @@ class LoggingTests: XCTestCase {
         let target = "tests"
         XCTAssertTrue(Tracing.logFiles.isEmpty)
         
-        Target.tests.configure(logLevel: .info, traceLogPacks: [])
+        await Target.tests.configure(logLevel: .info, traceLogPacks: [])
         
         // There is something weird with Rust logging where the file writing handle doesn't
         // notice that the file it is writing to was deleted, so we can't run these checks
@@ -34,7 +34,7 @@ class LoggingTests: XCTestCase {
         try validateTargetName(target)
         
         try validateRoomSummaryContentIsRedacted()
-        try validateTimelineContentIsRedacted()
+        try await validateTimelineContentIsRedacted()
         try validateRustMessageContentIsRedacted()
     }
     
@@ -114,7 +114,7 @@ class LoggingTests: XCTestCase {
         XCTAssertFalse(content.contains(heroName))
     }
         
-    func validateTimelineContentIsRedacted() throws {
+    func validateTimelineContentIsRedacted() async throws {
         // Given timeline items that contain text
         let textAttributedString = "TextAttributed"
         let textMessage = TextRoomTimelineItem(id: .randomEvent,
@@ -174,7 +174,7 @@ class LoggingTests: XCTestCase {
                                                               contentType: nil))
         
         // When logging that value
-        Target.tests.configure(logLevel: .info, traceLogPacks: [])
+        await Target.tests.configure(logLevel: .info, traceLogPacks: [])
         
         MXLog.info(textMessage)
         MXLog.info(noticeMessage)