Cancel effects when root store deallocates (pointfreeco#3613)

* Cancel effects when root store deinits.

* Add test for uncached stores.

* wip

* wip

* wip

* wip

---------

Co-authored-by: Stephen Celis <[email protected]>

Author: mbrandonw

ComposableArchitecture.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -52,14 +52,14 @@ public final class RootStore {
         defer { index += 1 }
         let action = self.bufferedActions[index] as! Action
         let effect = reducer.reduce(into: &currentState, action: action)
+        let uuid = UUID()
 
         switch effect.operation {
         case .none:
           break
         case let .publisher(publisher):
           var didComplete = false
           let boxedTask = Box<Task<Void, Never>?>(wrappedValue: nil)
-          let uuid = UUID()
           let effectCancellable = withEscapedDependencies { continuation in
             publisher
               .receive(on: UIScheduler.shared)
@@ -88,11 +88,13 @@ public final class RootStore {
             }
             boxedTask.wrappedValue = task
             tasks.withValue { $0.append(task) }
-            self.effectCancellables[uuid] = effectCancellable
+            self.effectCancellables[uuid] = AnyCancellable {
+              task.cancel()
+            }
           }
         case let .run(priority, operation):
           withEscapedDependencies { continuation in
-            let task = Task(priority: priority) { @MainActor in
+            let task = Task(priority: priority) { @MainActor [weak self] in
               let isCompleted = LockIsolated(false)
               defer { isCompleted.setValue(true) }
               await operation(
@@ -118,14 +120,18 @@ public final class RootStore {
                     )
                   }
                   if let task = continuation.yield({
-                    self.send(effectAction, originatingFrom: action)
+                    self?.send(effectAction, originatingFrom: action)
                   }) {
                     tasks.withValue { $0.append(task) }
                   }
                 }
               )
+              self?.effectCancellables[uuid] = nil
             }
             tasks.withValue { $0.append(task) }
+            self.effectCancellables[uuid] = AnyCancellable {
+              task.cancel()
+            }
           }
         }
       }

Package.resolved

@@ -2,6 +2,7 @@ import Combine
 @_spi(Logging) import ComposableArchitecture
 import XCTest
 
+@available(iOS 16, macOS 13, tvOS 16, watchOS 9, *)
 final class StoreLifetimeTests: BaseTCATestCase {
   @available(*, deprecated)
   @MainActor
@@ -69,9 +70,6 @@ final class StoreLifetimeTests: BaseTCATestCase {
 
     @MainActor
     func testStoreDeinit_RunningEffect() async {
-      XCTTODO(
-        "We would like for this to pass, but it requires full deprecation of uncached child stores"
-      )
       Logger.shared.isEnabled = true
       let effectFinished = self.expectation(description: "Effect finished")
       do {
@@ -99,9 +97,6 @@ final class StoreLifetimeTests: BaseTCATestCase {
 
     @MainActor
     func testStoreDeinit_RunningCombineEffect() async {
-      XCTTODO(
-        "We would like for this to pass, but it requires full deprecation of uncached child stores"
-      )
       Logger.shared.isEnabled = true
       let effectFinished = self.expectation(description: "Effect finished")
       do {
@@ -129,28 +124,61 @@ final class StoreLifetimeTests: BaseTCATestCase {
       await self.fulfillment(of: [effectFinished], timeout: 0.5)
     }
   #endif
+
+  @MainActor
+  @available(*, deprecated)
+  func testUnCachedStores() async {
+    Logger.shared.isEnabled = true
+    let clock = TestClock()
+    let store = Store(initialState: Parent.State()) {
+      Parent()
+    } withDependencies: {
+      $0.continuousClock = clock
+    }
+    do {
+      let child = store.scope(state: { $0.child }, action: { .child($0) })
+      child.send(.start)
+      XCTAssertEqual(store.withState(\.child.count), 1)
+    }
+    await clock.run()
+    XCTAssertEqual(store.withState(\.child.count), 2)
+  }
 }
 
 @Reducer
+@available(iOS 16, macOS 13, tvOS 16, watchOS 9, *)
 private struct Child {
   struct State: Equatable {
     var count = 0
   }
   enum Action {
     case tap
+    case start
+    case response
   }
+  @Dependency(\.continuousClock) var clock
   var body: some ReducerOf<Self> {
     Reduce { state, action in
       switch action {
       case .tap:
         state.count += 1
         return .none
+      case .start:
+        state.count += 1
+        return .run { send in
+          try await clock.sleep(for: .seconds(0))
+          await send(.response)
+        }
+      case .response:
+        state.count += 1
+        return .none
       }
     }
   }
 }
 
 @Reducer
+@available(iOS 16, macOS 13, tvOS 16, watchOS 9, *)
 private struct Parent {
   struct State: Equatable {
     var child = Child.State()
@@ -166,6 +194,7 @@ private struct Parent {
 }
 
 @Reducer
+@available(iOS 16, macOS 13, tvOS 16, watchOS 9, *)
 private struct Grandparent {
   struct State: Equatable {
     var child = Parent.State()