Move AsyncOperation into Operations static library and add separate tests

1 files changed, 54 insertions, 0 deletions

diff --git a/ios/Operations/BackgroundObserver.swift b/ios/Operations/BackgroundObserver.swift
new file mode 100644
index 0000000000..1de842f766
--- /dev/null
+++ b/ios/Operations/BackgroundObserver.swift
@@ -0,0 +1,54 @@
+//
+//  BackgroundObserver.swift
+//  MullvadVPN
+//
+//  Created by pronebird on 31/05/2022.
+//  Copyright © 2022 Mullvad VPN AB. All rights reserved.
+//
+
+#if canImport(UIKit)
+
+import UIKit
+
+public final class BackgroundObserver: OperationObserver {
+    public let name: String
+    public let application: UIApplication
+    public let cancelUponExpiration: Bool
+
+    private var taskIdentifier: UIBackgroundTaskIdentifier?
+
+    public init(
+        application: UIApplication = .shared,
+        name: String,
+        cancelUponExpiration: Bool
+    ) {
+        self.application = application
+        self.name = name
+        self.cancelUponExpiration = cancelUponExpiration
+    }
+
+    public func didAttach(to operation: Operation) {
+        let expirationHandler = cancelUponExpiration ? { operation.cancel() } : nil
+
+        taskIdentifier = application.beginBackgroundTask(
+            withName: name,
+            expirationHandler: expirationHandler
+        )
+    }
+
+    public func operationDidStart(_ operation: Operation) {
+        // no-op
+    }
+
+    public func operationDidCancel(_ operation: Operation) {
+        // no-op
+    }
+
+    public func operationDidFinish(_ operation: Operation, error: Error?) {
+        if let taskIdentifier = taskIdentifier {
+            application.endBackgroundTask(taskIdentifier)
+        }
+    }
+}
+
+#endif