Implement GCP billing check in cluster form

app/controllers/projects/clusters/gcp_controller.rb

 class Projects::Clusters::GcpController < Projects::ApplicationController
   before_action :authorize_read_cluster!
   before_action :authorize_google_api, except: [:login]
-  before_action :authorize_google_project_billing, except: [:login, :check, :run_check]
+  before_action :authorize_google_project_billing, only: [:new]
   before_action :authorize_create_cluster!, only: [:new, :create]
 
   STATUS_POLLING_INTERVAL = 1.minute.to_i
@@ -25,15 +25,20 @@ class Projects::Clusters::GcpController < Projects::ApplicationController
   end
 
   def create
+    case google_project_billing_status
+    when 'true'
       @cluster = ::Clusters::CreateService
         .new(project, current_user, create_params)
         .execute(token_in_session)
 
-    if @cluster.persisted?
-      redirect_to project_cluster_path(project, @cluster)
+      return redirect_to project_cluster_path(project, @cluster) if @cluster.persisted?
+    when 'false'
+      flash[:error] = _('Please enable billing for one of your projects to be able to create a cluster.')
     else
-      render :new
+      flash[:error] = _('We could not verify that one of your projects on GCP has billing enabled. Please try again.')
     end
+
+    render :new
   end
 
   private
@@ -61,6 +66,15 @@ class Projects::Clusters::GcpController < Projects::ApplicationController
     end
   end
 
+  def authorize_google_project_billing
+    CheckGcpProjectBillingWorker.perform_async(token_in_session)
+  end
+
+  def google_project_billing_status
+    Gitlab::Redis::SharedState.with do |redis|
+      redis.get(CheckGcpProjectBillingWorker.redis_shared_state_key_for(token_in_session))
+    end
+  end
 
   def token_in_session
     @token_in_session ||=

spec/controllers/projects/clusters/gcp_controller_spec.rb

@@ -77,6 +77,8 @@ describe Projects::Clusters::GcpController do
         end
 
         it 'has new object' do
+          expect(controller).to receive(:authorize_google_project_billing)
+
           go
 
           expect(assigns(:cluster)).to be_an_instance_of(Clusters::Cluster)
@@ -137,7 +139,11 @@ describe Projects::Clusters::GcpController do
           stub_google_api_validate_token
         end
 
-        context 'when creates a cluster on gke' do
+        context 'when google project billing is enabled' do
+          before do
+            stub_google_project_billing_status
+          end
+
           it 'creates a new cluster' do
             expect(ClusterProvisionWorker).to receive(:perform_async)
             expect { go }.to change { Clusters::Cluster.count }
@@ -147,6 +153,15 @@ describe Projects::Clusters::GcpController do
             expect(project.clusters.first).to be_kubernetes
           end
         end
+
+        context 'when google project billing is not enabled' do
+          it 'renders the cluster form with an error' do
+            go
+
+            expect(response).to set_flash[:error]
+            expect(response).to render_template('new')
+          end
+        end
       end
 
       context 'when access token is expired' do

spec/support/google_api/cloud_platform_helpers.rb

@@ -13,7 +13,7 @@ module GoogleApi
     def stub_google_project_billing_status
       redis_double = double
       allow(Gitlab::Redis::SharedState).to receive(:with).and_yield(redis_double)
-      allow(redis_double).to receive(:get).with(CheckGcpProjectBillingWorker.redis_shared_state_key_for).and_return('true')
+      allow(redis_double).to receive(:get).with(CheckGcpProjectBillingWorker.redis_shared_state_key_for('token')).and_return('true')
     end
 
     def stub_cloud_platform_get_zone_cluster(project_id, zone, cluster_id, **options)