ios: better backgrounding/resume

2026-05-02 22:18:45 -07:00
parent cf9832ca3b
commit 4ad36d9bf6
7 changed files with 421 additions and 10 deletions
@@ -0,0 +1,36 @@
+import UIKit
+
+@MainActor
+final class SybilBackgroundTaskAssertion {
+    private let name: String
+    private var identifier: UIBackgroundTaskIdentifier = .invalid
+
+    init?(name: String, onExpiration: @escaping @MainActor () -> Void = {}) {
+        self.name = name
+        identifier = UIApplication.shared.beginBackgroundTask(withName: name) { [weak self] in
+            Task { @MainActor in
+                guard let self else { return }
+                SybilLog.warning(SybilLog.app, "Background task expired: \(self.name)")
+                onExpiration()
+                self.end()
+            }
+        }
+
+        guard identifier != .invalid else {
+            SybilLog.warning(SybilLog.app, "Failed to acquire background task: \(name)")
+            return nil
+        }
+
+        SybilLog.debug(SybilLog.app, "Acquired background task: \(name)")
+    }
+
+    func end() {
+        guard identifier != .invalid else {
+            return
+        }
+
+        UIApplication.shared.endBackgroundTask(identifier)
+        identifier = .invalid
+        SybilLog.debug(SybilLog.app, "Ended background task: \(name)")
+    }
+}