[Core] Fix iOS 12 spec lint failure from incomplete `FirebaseCoreInte…

…rnal` implementation (#13952)

Firebase.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'Firebase'
-  s.version          = '11.4.1'
+  s.version          = '11.4.2'
   s.summary          = 'Firebase'
 
   s.description      = <<-DESC
@@ -43,7 +43,7 @@ Simplify your app development, grow your user base, and monetize more effectivel
   end
 
   s.subspec 'CoreOnly' do |ss|
-    ss.dependency 'FirebaseCore', '11.4.1'
+    ss.dependency 'FirebaseCore', '11.4.2'
     ss.source_files = 'CoreOnly/Sources/Firebase.h'
     ss.preserve_paths = 'CoreOnly/Sources/module.modulemap'
     if ENV['FIREBASE_POD_REPO_FOR_DEV_POD'] then

FirebaseAuth/Tests/Unit/AuthBackendRPCImplementationTests.swift

@@ -534,6 +534,11 @@ class AuthBackendRPCImplementationTests: RPCBaseTests {
 
   #if COCOAPODS || SWIFT_PACKAGE
     private class FakeHeartbeatLogger: NSObject, FIRHeartbeatLoggerProtocol {
+      func headerValue() -> String? {
+        // `asyncHeaderValue` should be used instead.
+        fatalError("FakeHeartbeatLogger headerValue should not be used in tests.")
+      }
+
       func asyncHeaderValue() async -> String? {
         let payload = flushHeartbeatsIntoPayload()
         guard !payload.isEmpty else {

FirebaseCore.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'FirebaseCore'
-  s.version          = '11.4.1'
+  s.version          = '11.4.2'
   s.summary          = 'Firebase Core'
 
   s.description      = <<-DESC
@@ -53,7 +53,7 @@ Firebase Core includes FIRApp and FIROptions which provide central configuration
   # Remember to also update version in `cmake/external/GoogleUtilities.cmake`
   s.dependency 'GoogleUtilities/Environment', '~> 8.0'
   s.dependency 'GoogleUtilities/Logger', '~> 8.0'
-  s.dependency 'FirebaseCoreInternal', '~> 11.4'
+  s.dependency 'FirebaseCoreInternal', '>= 11.4.2', '< 12.0'
 
   s.pod_target_xcconfig = {
     'GCC_C_LANGUAGE_STANDARD' => 'c99',

FirebaseCore/CHANGELOG.md

@@ -1,3 +1,7 @@
+# Firebase 11.4.2
+- [fixed] CocoaPods only release to fix iOS 12 build failure resulting from
+  incomplete implementation in the FirebaseCoreInternal CocoaPod.
+
 # Firebase 11.4.1
 - [fixed] CocoaPods only release to revert breaking change in
   `FirebaseCoreExtension` SDK. (#13942)

FirebaseCore/Internal/Sources/HeartbeatLogging/HeartbeatController.swift

@@ -126,34 +126,30 @@ public final class HeartbeatController {
     }
   }
 
-  @available(iOS 13.0, macOS 10.15, macCatalyst 13.0, tvOS 13.0, watchOS 6.0, *)
-  public func flushAsync() async -> HeartbeatsPayload {
-    return await withCheckedContinuation { continuation in
-      let resetTransform = { (heartbeatsBundle: HeartbeatsBundle?) -> HeartbeatsBundle? in
-        guard let oldHeartbeatsBundle = heartbeatsBundle else {
-          return nil // Storage was empty.
-        }
-        // The new value that's stored will use the old's cache to prevent the
-        // logging of duplicates after flushing.
-        return HeartbeatsBundle(
-          capacity: self.heartbeatsStorageCapacity,
-          cache: oldHeartbeatsBundle.lastAddedHeartbeatDates
-        )
+  public func flushAsync(completionHandler: @escaping (HeartbeatsPayload) -> Void) {
+    let resetTransform = { (heartbeatsBundle: HeartbeatsBundle?) -> HeartbeatsBundle? in
+      guard let oldHeartbeatsBundle = heartbeatsBundle else {
+        return nil // Storage was empty.
       }
+      // The new value that's stored will use the old's cache to prevent the
+      // logging of duplicates after flushing.
+      return HeartbeatsBundle(
+        capacity: self.heartbeatsStorageCapacity,
+        cache: oldHeartbeatsBundle.lastAddedHeartbeatDates
+      )
+    }
 
-      // Asynchronously gets and returns the stored heartbeats, resetting storage
-      // using the given transform.
-      storage.getAndSetAsync(using: resetTransform) { result in
-        switch result {
-        case let .success(heartbeatsBundle):
-          // If no heartbeats bundle was stored, return an empty payload.
-          continuation
-            .resume(returning: heartbeatsBundle?.makeHeartbeatsPayload() ?? HeartbeatsPayload
-              .emptyPayload)
-        case .failure:
-          // If the operation throws, assume no heartbeat(s) were retrieved or set.
-          continuation.resume(returning: HeartbeatsPayload.emptyPayload)
-        }
+    // Asynchronously gets and returns the stored heartbeats, resetting storage
+    // using the given transform.
+    storage.getAndSetAsync(using: resetTransform) { result in
+      switch result {
+      case let .success(heartbeatsBundle):
+        // If no heartbeats bundle was stored, return an empty payload.
+        completionHandler(heartbeatsBundle?.makeHeartbeatsPayload() ?? HeartbeatsPayload
+          .emptyPayload)
+      case .failure:
+        // If the operation throws, assume no heartbeat(s) were retrieved or set.
+        completionHandler(HeartbeatsPayload.emptyPayload)
       }
     }
   }

FirebaseCore/Internal/Sources/HeartbeatLogging/_ObjC_HeartbeatController.swift

@@ -49,10 +49,12 @@ public class _ObjC_HeartbeatController: NSObject {
   ///
   /// - Note: This API is thread-safe.
   /// - Returns: A heartbeats payload for the flushed heartbeat(s).
-  @available(iOS 13.0, macOS 10.15, macCatalyst 13.0, tvOS 13.0, watchOS 6.0, *)
-  public func flushAsync() async -> _ObjC_HeartbeatsPayload {
-    let heartbeatsPayload = await heartbeatController.flushAsync()
-    return _ObjC_HeartbeatsPayload(heartbeatsPayload)
+  public func flushAsync(completionHandler: @escaping (_ObjC_HeartbeatsPayload) -> Void) {
+    // TODO: When minimum version moves to iOS 13.0, restore the async version
+    // removed in #13952.
+    heartbeatController.flushAsync { heartbeatsPayload in
+      completionHandler(_ObjC_HeartbeatsPayload(heartbeatsPayload))
+    }
   }
 
   /// Synchronously flushes the heartbeat for today.

FirebaseCore/Internal/Tests/Integration/HeartbeatLoggingIntegrationTests.swift

@@ -52,29 +52,36 @@ class HeartbeatLoggingIntegrationTests: XCTestCase {
     )
   }
 
-  @available(iOS 13.0, macOS 10.15, macCatalyst 13.0, tvOS 13.0, watchOS 6.0, *)
-  func testLogAndFlushAsync() async throws {
+  func testLogAndFlushAsync() throws {
     // Given
     let heartbeatController = HeartbeatController(id: #function)
     let expectedDate = HeartbeatsPayload.dateFormatter.string(from: Date())
+    let expectation = self.expectation(description: #function)
     // When
     heartbeatController.log("dummy_agent")
-    let payload = await heartbeatController.flushAsync()
-    // Then
-    try HeartbeatLoggingTestUtils.assertEqualPayloadStrings(
-      payload.headerValue(),
-      """
-      {
-        "version": 2,
-        "heartbeats": [
+    heartbeatController.flushAsync { payload in
+      // Then
+      do {
+        try HeartbeatLoggingTestUtils.assertEqualPayloadStrings(
+          payload.headerValue(),
+          """
           {
-            "agent": "dummy_agent",
-            "dates": ["\(expectedDate)"]
+            "version": 2,
+            "heartbeats": [
+              {
+                "agent": "dummy_agent",
+                "dates": ["\(expectedDate)"]
+              }
+            ]
           }
-        ]
+          """
+        )
+        expectation.fulfill()
+      } catch {
+        XCTFail("Unexpected error: \(error)")
       }
-      """
-    )
+    }
+    waitForExpectations(timeout: 1.0)
   }
 
   /// This test may flake if it is executed during the transition from one day to the next.

FirebaseCore/Internal/Tests/Unit/HeartbeatControllerTests.swift

@@ -58,35 +58,41 @@ class HeartbeatControllerTests: XCTestCase {
     assertHeartbeatControllerFlushesEmptyPayload(controller)
   }
 
-  @available(iOS 13.0, macOS 10.15, macCatalyst 13.0, tvOS 13.0, watchOS 6.0, *)
-  func testLogAndFlushAsync() async throws {
+  func testLogAndFlushAsync() throws {
     // Given
     let controller = HeartbeatController(
       storage: HeartbeatStorageFake(),
       dateProvider: { self.date }
     )
+    let expectation = expectation(description: #function)
 
     assertHeartbeatControllerFlushesEmptyPayload(controller)
 
     // When
     controller.log("dummy_agent")
-    let heartbeatPayload = await controller.flushAsync()
-
-    // Then
-    try HeartbeatLoggingTestUtils.assertEqualPayloadStrings(
-      heartbeatPayload.headerValue(),
-      """
-      {
-        "version": 2,
-        "heartbeats": [
+    controller.flushAsync { heartbeatPayload in
+      // Then
+      do {
+        try HeartbeatLoggingTestUtils.assertEqualPayloadStrings(
+          heartbeatPayload.headerValue(),
+          """
           {
-            "agent": "dummy_agent",
-            "dates": ["2021-11-01"]
+            "version": 2,
+            "heartbeats": [
+              {
+                "agent": "dummy_agent",
+                "dates": ["2021-11-01"]
+              }
+            ]
           }
-        ]
+          """
+        )
+        expectation.fulfill()
+      } catch {
+        XCTFail("Unexpected error: \(error)")
       }
-      """
-    )
+    }
+    waitForExpectations(timeout: 1.0)
 
     assertHeartbeatControllerFlushesEmptyPayload(controller)
   }

FirebaseCore/Sources/FIRHeartbeatLogger.m

@@ -87,7 +87,8 @@ - (FIRHeartbeatsPayload *)flushHeartbeatsIntoPayload {
 }
 
 - (void)flushHeartbeatsIntoPayloadWithCompletionHandler:
-    (void (^)(FIRHeartbeatsPayload *))completionHandler {
+    (void (^)(FIRHeartbeatsPayload *))completionHandler
+    API_AVAILABLE(ios(13.0), macosx(10.15), macCatalyst(13.0), tvos(13.0), watchos(6.0)) {
   [_heartbeatController flushAsyncWithCompletionHandler:^(FIRHeartbeatsPayload *payload) {
     completionHandler(payload);
   }];

FirebaseCoreInternal.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name             = 'FirebaseCoreInternal'
-  s.version          = '11.4.0'
+  s.version          = '11.4.2'
   s.summary          = 'APIs for internal FirebaseCore usage.'
 
   s.description      = <<-DESC