Manage location on VertexAI instead of model (#12630)

FirebaseVertexAI/Sample/ChatSample/ViewModels/ConversationViewModel.swift

@@ -36,10 +36,7 @@ class ConversationViewModel: ObservableObject {
   private var chatTask: Task<Void, Never>?
 
   init() {
-    model = VertexAI.vertexAI().generativeModel(
-      modelName: "gemini-1.0-pro",
-      location: "us-central1"
-    )
+    model = VertexAI.vertexAI(region: "us-central1").generativeModel(modelName: "gemini-1.0-pro")
     chat = model.startChat()
   }
 

FirebaseVertexAI/Sample/GenerativeAIMultimodalSample/ViewModels/PhotoReasoningViewModel.swift

@@ -44,10 +44,7 @@ class PhotoReasoningViewModel: ObservableObject {
   private var model: GenerativeModel?
 
   init() {
-    model = VertexAI.vertexAI().generativeModel(
-      modelName: "gemini-1.0-pro-vision",
-      location: "us-central1"
-    )
+    model = VertexAI.vertexAI(region: "us-central1").generativeModel(modelName: "gemini-1.0-pro")
   }
 
   func reason() async {

FirebaseVertexAI/Sample/GenerativeAITextSample/ViewModels/SummarizeViewModel.swift

@@ -32,10 +32,7 @@ class SummarizeViewModel: ObservableObject {
   private var model: GenerativeModel?
 
   init() {
-    model = VertexAI.vertexAI().generativeModel(
-      modelName: "gemini-1.0-pro",
-      location: "us-central1"
-    )
+    model = VertexAI.vertexAI(region: "us-central1").generativeModel(modelName: "gemini-1.0-pro")
   }
 
   func summarize(inputText: String) async {

FirebaseVertexAI/Sources/VertexAI.swift

@@ -25,26 +25,35 @@ public class VertexAI: NSObject {
 
   /// The default `VertexAI` instance.
   ///
+  ///  - Parameter region: The region identifier, e.g., `us-central1`; see
+  ///     [Vertex AI
+  ///     regions](https://cloud.google.com/vertex-ai/docs/general/locations#vertex-ai-regions)
+  ///     for a list of supported regions.
   /// - Returns: An instance of `VertexAI`, configured with the default `FirebaseApp`.
-  public static func vertexAI() -> VertexAI {
+  public static func vertexAI(region: String) -> VertexAI {
     guard let app = FirebaseApp.app() else {
       fatalError("No instance of the default Firebase app was found.")
     }
 
-    return vertexAI(app: app)
+    return vertexAI(app: app, region: region)
   }
 
   /// Creates an instance of `VertexAI` configured with a custom `FirebaseApp`.
   ///
-  /// - Parameter app: The custom `FirebaseApp` used for initialization.
+  ///  - Parameters:
+  ///   - app: The custom `FirebaseApp` used for initialization.
+  ///   - region: The region identifier, e.g., `us-central1`; see
+  ///     [Vertex AI
+  ///     regions](https://cloud.google.com/vertex-ai/docs/general/locations#vertex-ai-regions)
+  ///     for a list of supported regions.
   /// - Returns: A `VertexAI` instance, configured with the custom `FirebaseApp`.
-  public static func vertexAI(app: FirebaseApp) -> VertexAI {
+  public static func vertexAI(app: FirebaseApp, region: String) -> VertexAI {
     guard let provider = ComponentType<VertexAIProvider>.instance(for: VertexAIProvider.self,
                                                                   in: app.container) else {
       fatalError("No \(VertexAIProvider.self) instance found for Firebase app: \(app.name)")
     }
 
-    return provider.vertexAI()
+    return provider.vertexAI(region)
   }
 
   /// Initializes a generative model with the given parameters.
@@ -54,19 +63,15 @@ public class VertexAI: NSObject {
   ///     [Gemini
   ///     models](https://cloud.google.com/vertex-ai/generative-ai/docs/learn/models#gemini-models)
   ///     for a list of supported model names.
-  ///   - location: The location identifier, e.g., `us-central1`; see
-  ///     [Vertex AI
-  ///     regions](https://cloud.google.com/vertex-ai/docs/general/locations#vertex-ai-regions)
-  ///     for a list of supported locations.
   ///   - generationConfig: The content generation parameters your model should use.
   ///   - safetySettings: A value describing what types of harmful content your model should allow.
   ///   - requestOptions: Configuration parameters for sending requests to the backend.
-  public func generativeModel(modelName: String, location: String,
+  public func generativeModel(modelName: String,
                               generationConfig: GenerationConfig? = nil,
                               safetySettings: [SafetySetting]? = nil,
                               requestOptions: RequestOptions = RequestOptions())
     -> GenerativeModel {
-    let modelResourceName = modelResourceName(modelName: modelName, location: location)
+    let modelResourceName = modelResourceName(modelName: modelName, region: region)
 
     guard let apiKey = app.options.apiKey else {
       fatalError("The Firebase app named \"\(app.name)\" has no API key in its configuration.")
@@ -89,26 +94,29 @@ public class VertexAI: NSObject {
 
   private let appCheck: AppCheckInterop?
 
-  init(app: FirebaseApp) {
+  private let region: String
+
+  init(app: FirebaseApp, region: String) {
     self.app = app
+    self.region = region
     appCheck = ComponentType<AppCheckInterop>.instance(for: AppCheckInterop.self, in: app.container)
   }
 
-  private func modelResourceName(modelName: String, location: String) -> String {
+  private func modelResourceName(modelName: String, region: String) -> String {
     if modelName.contains("/") {
       return modelName
     }
     guard let projectID = app.options.projectID else {
       fatalError("The Firebase app named \"\(app.name)\" has no project ID in its configuration.")
     }
-    guard !location.isEmpty else {
+    guard !region.isEmpty else {
       fatalError("""
-      No location specified; see
+      No region specified; see
       https://cloud.google.com/vertex-ai/generative-ai/docs/learn/locations#available-regions for a
       list of available regions.
       """)
     }
 
-    return "projects/\(projectID)/locations/\(location)/publishers/google/models/\(modelName)"
+    return "projects/\(projectID)/locations/\(region)/publishers/google/models/\(modelName)"
   }
 }

FirebaseVertexAI/Sources/VertexAIComponent.swift

@@ -22,7 +22,7 @@ import Foundation
 @available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
 @objc(FIRVertexAIProvider)
 protocol VertexAIProvider {
-  @objc func vertexAI() -> VertexAI
+  @objc func vertexAI(_ location: String) -> VertexAI
 }
 
 @available(iOS 15.0, macOS 11.0, macCatalyst 15.0, *)
@@ -64,7 +64,7 @@ class VertexAIComponent: NSObject, Library, VertexAIProvider {
 
   // MARK: - VertexAIProvider conformance
 
-  func vertexAI() -> VertexAI {
+  func vertexAI(_ region: String) -> VertexAI {
     os_unfair_lock_lock(&instancesLock)
 
     // Unlock before the function returns.
@@ -73,7 +73,7 @@ class VertexAIComponent: NSObject, Library, VertexAIProvider {
     if let instance = instances[app.name] {
       return instance
     }
-    let newInstance = VertexAI(app: app)
+    let newInstance = VertexAI(app: app, region: region)
     instances[app.name] = newInstance
     return newInstance
   }

FirebaseVertexAI/Tests/Unit/VertexAIAPITests.swift

@@ -34,31 +34,28 @@ final class VertexAIAPITests: XCTestCase {
     let filters = [SafetySetting(harmCategory: .dangerousContent, threshold: .blockOnlyHigh)]
 
     // Instantiate Vertex AI SDK - Default App
-    let vertexAI = VertexAI.vertexAI()
+    let vertexAI = VertexAI.vertexAI(region: "my-region")
 
     // Instantiate Vertex AI SDK - Custom App
-    let _ = VertexAI.vertexAI(app: app!)
+    let _ = VertexAI.vertexAI(app: app!, region: "my-region")
 
     // Permutations without optional arguments.
 
-    let _ = vertexAI.generativeModel(modelName: "gemini-1.0-pro", location: "us-central1")
+    let _ = vertexAI.generativeModel(modelName: "gemini-1.0-pro")
 
     let _ = vertexAI.generativeModel(
       modelName: "gemini-1.0-pro",
-      location: "us-central1",
       safetySettings: filters
     )
 
     let _ = vertexAI.generativeModel(
       modelName: "gemini-1.0-pro",
-      location: "us-central1",
       generationConfig: config
     )
 
     // All arguments passed.
     let genAI = vertexAI.generativeModel(
       modelName: "gemini-1.0-pro",
-      location: "us-central1",
       generationConfig: config, // Optional
       safetySettings: filters // Optional
     )