feat: introduce DataTransfer APIs (#30949)

* feat: introduce DataTransfer APIs

PiperOrigin-RevId: 803093347

Source-Link: googleapis/googleapis@a195f5b

Source-Link: googleapis/googleapis-gen@a4ce123
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google-cloud-network_connectivity/lib/google/cloud/network_connectivity.rb

@@ -106,6 +106,67 @@ def self.cross_network_automation_service_available? version: :v1
         false
       end
 
+      ##
+      # Create a new client object for DataTransferService.
+      #
+      # By default, this returns an instance of
+      # [Google::Cloud::NetworkConnectivity::V1::DataTransferService::Client](https://cloud.google.com/ruby/docs/reference/google-cloud-network_connectivity-v1/latest/Google-Cloud-NetworkConnectivity-V1-DataTransferService-Client)
+      # for a gRPC client for version V1 of the API.
+      # However, you can specify a different API version by passing it in the
+      # `version` parameter. If the DataTransferService service is
+      # supported by that API version, and the corresponding gem is available, the
+      # appropriate versioned client will be returned.
+      #
+      # Raises an exception if the currently installed versioned client gem for the
+      # given API version does not support the DataTransferService service.
+      # You can determine whether the method will succeed by calling
+      # {Google::Cloud::NetworkConnectivity.data_transfer_service_available?}.
+      #
+      # ## About DataTransferService
+      #
+      # DataTransferService is the service for the Data Transfer API.
+      #
+      # @param version [::String, ::Symbol] The API version to connect to. Optional.
+      #   Defaults to `:v1`.
+      # @return [::Object] A client object for the specified version.
+      #
+      def self.data_transfer_service version: :v1, &block
+        require "google/cloud/network_connectivity/#{version.to_s.downcase}"
+
+        package_name = Google::Cloud::NetworkConnectivity
+                       .constants
+                       .select { |sym| sym.to_s.downcase == version.to_s.downcase.tr("_", "") }
+                       .first
+        service_module = Google::Cloud::NetworkConnectivity.const_get(package_name).const_get(:DataTransferService)
+        service_module.const_get(:Client).new(&block)
+      end
+
+      ##
+      # Determines whether the DataTransferService service is supported by the current client.
+      # If true, you can retrieve a client object by calling {Google::Cloud::NetworkConnectivity.data_transfer_service}.
+      # If false, that method will raise an exception. This could happen if the given
+      # API version does not exist or does not support the DataTransferService service,
+      # or if the versioned client gem needs an update to support the DataTransferService service.
+      #
+      # @param version [::String, ::Symbol] The API version to connect to. Optional.
+      #   Defaults to `:v1`.
+      # @return [boolean] Whether the service is available.
+      #
+      def self.data_transfer_service_available? version: :v1
+        require "google/cloud/network_connectivity/#{version.to_s.downcase}"
+        package_name = Google::Cloud::NetworkConnectivity
+                       .constants
+                       .select { |sym| sym.to_s.downcase == version.to_s.downcase.tr("_", "") }
+                       .first
+        return false unless package_name
+        service_module = Google::Cloud::NetworkConnectivity.const_get package_name
+        return false unless service_module.const_defined? :DataTransferService
+        service_module = service_module.const_get :DataTransferService
+        service_module.const_defined? :Client
+      rescue ::LoadError
+        false
+      end
+
       ##
       # Create a new client object for HubService.
       #

google-cloud-network_connectivity/test/google/cloud/network_connectivity/client_test.rb

@@ -51,6 +51,17 @@ def test_cross_network_automation_service_grpc
     end
   end
 
+  def test_data_transfer_service_grpc
+    skip unless Google::Cloud::NetworkConnectivity.data_transfer_service_available?
+    Gapic::ServiceStub.stub :new, DummyStub.new do
+      grpc_channel = GRPC::Core::Channel.new "localhost:8888", nil, :this_channel_is_insecure
+      client = Google::Cloud::NetworkConnectivity.data_transfer_service do |config|
+        config.credentials = grpc_channel
+      end
+      assert_kind_of Google::Cloud::NetworkConnectivity::V1::DataTransferService::Client, client
+    end
+  end
+
   def test_hub_service_grpc
     skip unless Google::Cloud::NetworkConnectivity.hub_service_available?
     Gapic::ServiceStub.stub :new, DummyStub.new do