Move AsyncOperation into Operations static library and add separate tests

1 files changed, 63 insertions, 0 deletions

diff --git a/ios/Operations/OperationObserver.swift b/ios/Operations/OperationObserver.swift
new file mode 100644
index 0000000000..db6264d2ba
--- /dev/null
+++ b/ios/Operations/OperationObserver.swift
@@ -0,0 +1,63 @@
+//
+//  OperationObserver.swift
+//  MullvadVPN
+//
+//  Created by pronebird on 30/05/2022.
+//  Copyright © 2022 Mullvad VPN AB. All rights reserved.
+//
+
+import Foundation
+
+public protocol OperationObserver {
+    func didAttach(to operation: Operation)
+    func operationDidStart(_ operation: Operation)
+    func operationDidCancel(_ operation: Operation)
+    func operationDidFinish(_ operation: Operation, error: Error?)
+}
+
+/// Block based operation observer.
+public class OperationBlockObserver<OperationType: Operation>: OperationObserver {
+    public typealias VoidBlock = (OperationType) -> Void
+    public typealias FinishBlock = (OperationType, Error?) -> Void
+
+    private let _didAttach: VoidBlock?
+    private let _didStart: VoidBlock?
+    private let _didCancel: VoidBlock?
+    private let _didFinish: FinishBlock?
+
+    public init(
+        didAttach: VoidBlock? = nil,
+        didStart: VoidBlock? = nil,
+        didCancel: VoidBlock? = nil,
+        didFinish: FinishBlock? = nil
+    ) {
+        _didAttach = didAttach
+        _didStart = didStart
+        _didCancel = didCancel
+        _didFinish = didFinish
+    }
+
+    public func didAttach(to operation: Operation) {
+        if let operation = operation as? OperationType {
+            _didAttach?(operation)
+        }
+    }
+
+    public func operationDidStart(_ operation: Operation) {
+        if let operation = operation as? OperationType {
+            _didStart?(operation)
+        }
+    }
+
+    public func operationDidCancel(_ operation: Operation) {
+        if let operation = operation as? OperationType {
+            _didCancel?(operation)
+        }
+    }
+
+    public func operationDidFinish(_ operation: Operation, error: Error?) {
+        if let operation = operation as? OperationType {
+            _didFinish?(operation, error)
+        }
+    }
+}