[MLModelDownloader] Migrate to GoogleUtilities's storage container

FirebaseMLModelDownloader.podspec

@@ -40,7 +40,8 @@ Pod::Spec.new do |s|
   s.dependency 'FirebaseInstallations', '~> 10.0'
   s.dependency 'GoogleDataTransport', '~> 9.2'
   # TODO: Revisit this dependency
-  s.dependency 'GoogleUtilities/Logger', '~> 7.8'
+  s.dependency 'GoogleUtilities/Logger', '~> 7.13'
+  s.dependency 'GoogleUtilities/UserDefaults', '~> 7.13'
   s.dependency 'SwiftProtobuf', '~> 1.19'
 
   s.pod_target_xcconfig = {

FirebaseMLModelDownloader/Sources/DeviceLogger.swift

@@ -14,9 +14,9 @@
 
 import Foundation
 #if SWIFT_PACKAGE
-  import GoogleUtilities_Logger
+  @_implementationOnly import GoogleUtilities_Logger
 #else
-  import GoogleUtilities
+  @_implementationOnly import GoogleUtilities
 #endif
 
 /// Enum of log messages.

FirebaseMLModelDownloader/Sources/DownloaderUserDefaults.swift

@@ -13,9 +13,14 @@
 // limitations under the License.
 
 import Foundation
+#if SWIFT_PACKAGE
+  @_implementationOnly import GoogleUtilities_UserDefaults
+#else
+  @_implementationOnly import GoogleUtilities
+#endif // SWIFT_PACKAGE
 
 /// Protocol to save or delete model info in user defaults.
 protocol DownloaderUserDefaultsWriteable {
-  func writeToDefaults(_ defaults: UserDefaults, appName: String)
-  func removeFromDefaults(_ defaults: UserDefaults, appName: String)
+  func writeToDefaults(_ defaults: GULUserDefaults, appName: String)
+  func removeFromDefaults(_ defaults: GULUserDefaults, appName: String)
 }

FirebaseMLModelDownloader/Sources/LocalModelInfo.swift

@@ -13,6 +13,11 @@
 // limitations under the License.
 
 import Foundation
+#if SWIFT_PACKAGE
+  @_implementationOnly import GoogleUtilities_UserDefaults
+#else
+  @_implementationOnly import GoogleUtilities
+#endif // SWIFT_PACKAGE
 
 /// Model info object with details about downloaded and locally available model.
 class LocalModelInfo {
@@ -41,7 +46,7 @@ class LocalModelInfo {
   }
 
   /// Convenience init to create local model info from stored info in user defaults.
-  convenience init?(fromDefaults defaults: UserDefaults, name: String, appName: String) {
+  convenience init?(fromDefaults defaults: GULUserDefaults, name: String, appName: String) {
     let defaultsPrefix = LocalModelInfo.getUserDefaultsKeyPrefix(appName: appName, modelName: name)
     guard let modelHash = defaults.string(forKey: "\(defaultsPrefix).model-hash") else {
       return nil
@@ -60,26 +65,22 @@ extension LocalModelInfo: DownloaderUserDefaultsWriteable {
   }
 
   /// Write local model info to user defaults.
-  func writeToDefaults(_ defaults: UserDefaults, appName: String) {
+  func writeToDefaults(_ defaults: GULUserDefaults, appName: String) {
     let defaultsPrefix = LocalModelInfo.getUserDefaultsKeyPrefix(appName: appName, modelName: name)
-    defaults.setValue(modelHash, forKey: "\(defaultsPrefix).model-hash")
-    defaults.setValue(size, forKey: "\(defaultsPrefix).model-size")
+    defaults.setObject(modelHash, forKey: "\(defaultsPrefix).model-hash")
+    defaults.setObject(size, forKey: "\(defaultsPrefix).model-size")
   }
 
-  func removeFromDefaults(_ defaults: UserDefaults, appName: String) {
+  func removeFromDefaults(_ defaults: GULUserDefaults, appName: String) {
     let defaultsPrefix = LocalModelInfo.getUserDefaultsKeyPrefix(appName: appName, modelName: name)
     defaults.removeObject(forKey: "\(defaultsPrefix).model-hash")
     defaults.removeObject(forKey: "\(defaultsPrefix).model-size")
   }
 }
 
 /// Named user defaults for FirebaseML.
-extension UserDefaults {
-  static var firebaseMLDefaults: UserDefaults {
-    let suiteName = "com.google.firebase.ml"
-    guard let defaults = UserDefaults(suiteName: suiteName) else {
-      return UserDefaults.standard
-    }
-    return defaults
+extension GULUserDefaults {
+  static var firebaseMLDefaults: GULUserDefaults {
+    return GULUserDefaults(suiteName: "com.google.firebase.ml")
   }
 }

FirebaseMLModelDownloader/Sources/ModelDownloadTask.swift

@@ -13,6 +13,11 @@
 // limitations under the License.
 
 import Foundation
+#if SWIFT_PACKAGE
+  @_implementationOnly import GoogleUtilities_UserDefaults
+#else
+  @_implementationOnly import GoogleUtilities
+#endif // SWIFT_PACKAGE
 
 /// Task to download model file to device.
 class ModelDownloadTask {
@@ -23,7 +28,7 @@ class ModelDownloadTask {
   private(set) var remoteModelInfo: RemoteModelInfo
 
   /// User defaults to which local model info should ultimately be written.
-  private let defaults: UserDefaults
+  private let defaults: GULUserDefaults
 
   /// Keeps track of download associated with this model download task.
   private(set) var downloadStatus: ModelDownloadStatus = .ready
@@ -44,7 +49,7 @@ class ModelDownloadTask {
 
   init(remoteModelInfo: RemoteModelInfo,
        appName: String,
-       defaults: UserDefaults,
+       defaults: GULUserDefaults,
        downloader: FileDownloader,
        progressHandler: ProgressHandler? = nil,
        completion: @escaping Completion,

FirebaseMLModelDownloader/Sources/ModelDownloader.swift

@@ -15,6 +15,11 @@
 import FirebaseCore
 import FirebaseInstallations
 import Foundation
+#if SWIFT_PACKAGE
+  @_implementationOnly import GoogleUtilities_UserDefaults
+#else
+  @_implementationOnly import GoogleUtilities
+#endif // SWIFT_PACKAGE
 
 /// Possible ways to get a custom model.
 public enum ModelDownloadType {
@@ -41,7 +46,7 @@ public class ModelDownloader {
   private let installations: Installations
 
   /// User defaults for model info.
-  private let userDefaults: UserDefaults
+  private let userDefaults: GULUserDefaults
 
   /// Telemetry logger tied to this instance of model downloader.
   let telemetryLogger: TelemetryLogger?
@@ -67,7 +72,7 @@ public class ModelDownloader {
   }
 
   /// Private init for model downloader.
-  private init(app: FirebaseApp, defaults: UserDefaults = .firebaseMLDefaults) {
+  private init(app: FirebaseApp, defaults: GULUserDefaults = .firebaseMLDefaults) {
     appName = app.name
     options = app.options
     installations = Installations.installations(app: app)
@@ -641,7 +646,7 @@ extension ModelDownloader {
 /// Model downloader extension for testing.
 extension ModelDownloader {
   /// Model downloader instance for testing.
-  static func modelDownloaderWithDefaults(_ defaults: UserDefaults,
+  static func modelDownloaderWithDefaults(_ defaults: GULUserDefaults,
                                           app: FirebaseApp) -> ModelDownloader {
     let downloader = ModelDownloader(app: app, defaults: defaults)
     return downloader

FirebaseMLModelDownloader/Tests/Integration/ModelDownloaderIntegrationTests.swift

@@ -22,20 +22,26 @@
   @testable import FirebaseInstallations
   @testable import FirebaseMLModelDownloader
   import XCTest
-
-  extension UserDefaults {
-    /// Returns a new cleared instance of user defaults.
-    static func createTestInstance(testName: String) -> UserDefaults {
+  #if SWIFT_PACKAGE
+    @_implementationOnly import GoogleUtilities_UserDefaults
+  #else
+    @_implementationOnly import GoogleUtilities
+  #endif // SWIFT_PACKAGE
+
+  extension GULUserDefaults {
+    /// Returns an instance of user defaults.
+    static func createTestInstance(testName: String) -> GULUserDefaults {
       let suiteName = "com.google.firebase.ml.test.\(testName)"
-      let defaults = UserDefaults(suiteName: suiteName)!
-      defaults.removePersistentDomain(forName: suiteName)
-      return defaults
+      // Clear the suite (`UserDefaults` and `GULUserDefaults` map to the same
+      // storage space and `GULUserDefaults` doesn't offer API to do this.)
+      UserDefaults(suiteName: suiteName)!.removePersistentDomain(forName: suiteName)
+      return GULUserDefaults(suiteName: suiteName)
     }
 
     /// Returns the existing user defaults instance.
-    static func getTestInstance(testName: String) -> UserDefaults {
+    static func getTestInstance(testName: String) -> GULUserDefaults {
       let suiteName = "com.google.firebase.ml.test.\(testName)"
-      return UserDefaults(suiteName: suiteName)!
+      return GULUserDefaults(suiteName: suiteName)
     }
   }
 

FirebaseMLModelDownloader/Tests/Unit/ModelDownloaderUnitTests.swift

@@ -22,6 +22,12 @@
   @testable import FirebaseInstallations
   @testable import FirebaseMLModelDownloader
   import XCTest
+  #if SWIFT_PACKAGE
+    @_implementationOnly import GoogleUtilities_Logger
+    @_implementationOnly import GoogleUtilities_UserDefaults
+  #else
+    @_implementationOnly import GoogleUtilities
+  #endif // SWIFT_PACKAGE
 
   /// Mock options to configure default Firebase app.
   private enum MockOptions {
@@ -1325,19 +1331,18 @@
     }
   }
 
-  extension UserDefaults {
-    /// Returns a new cleared instance of user defaults.
-    static func createUnitTestInstance(testName: String) -> UserDefaults {
+  extension GULUserDefaults {
+    /// Returns a new instance of user defaults.
+    static func createUnitTestInstance(testName: String) -> GULUserDefaults {
       let suiteName = "com.google.firebase.ml.test.\(testName)"
-      let defaults = UserDefaults(suiteName: suiteName)!
-      defaults.removePersistentDomain(forName: suiteName)
+      let defaults = GULUserDefaults(suiteName: suiteName)
       return defaults
     }
 
     /// Returns the existing user defaults instance.
-    static func getUnitTestInstance(testName: String) -> UserDefaults {
+    static func getUnitTestInstance(testName: String) -> GULUserDefaults {
       let suiteName = "com.google.firebase.ml.test.\(testName)"
-      return UserDefaults(suiteName: suiteName)!
+      return GULUserDefaults(suiteName: suiteName)
     }
   }
 

Package.swift

@@ -838,6 +838,7 @@ let package = Package(
         "FirebaseInstallations",
         .product(name: "GoogleDataTransport", package: "GoogleDataTransport"),
         .product(name: "GULLogger", package: "GoogleUtilities"),
+        .product(name: "GULUserDefaults", package: "GoogleUtilities"),
         .product(name: "SwiftProtobuf", package: "swift-protobuf"),
       ],
       path: "FirebaseMLModelDownloader/Sources",