Add Pages::PageDeletedEvent

Related to: #364070

Changelog: added

app/events/pages/page_deleted_event.rb

+# frozen_string_literal: true
+
+module Pages
+  class PageDeletedEvent < ::Gitlab::EventStore::Event
+    def schema
+      {
+        'type' => 'object',
+        'properties' => {
+          'project_id' => { 'type' => 'integer' },
+          'namespace_id' => { 'type' => 'integer' }
+        },
+        'required' => %w[project_id namespace_id]
+      }
+    end
+  end
+end

app/services/pages/delete_service.rb

@@ -11,7 +11,20 @@ def execute
       # > The default strategy is :nullify which sets the foreign keys to NULL.
       PagesDomain.for_project(project).delete_all
 
+      publish_deleted_event
+
       DestroyPagesDeploymentsWorker.perform_async(project.id)
     end
+
+    private
+
+    def publish_deleted_event
+      event = Pages::PageDeletedEvent.new(data: {
+        project_id: project.id,
+        namespace_id: project.namespace_id
+      })
+
+      Gitlab::EventStore.publish(event)
+    end
   end
 end

spec/events/pages/page_deleted_event_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Pages::PageDeletedEvent do
+  where(:data, :valid) do
+    [
+      [{ project_id: 1, namespace_id: 2 }, true],
+      [{ project_id: 1 }, false],
+      [{ namespace_id: 1 }, false],
+      [{ project_id: 'foo', namespace_id: 2 }, false],
+      [{ project_id: 1, namespace_id: 'foo' }, false],
+      [{ project_id: [], namespace_id: 2 }, false],
+      [{ project_id: 1, namespace_id: [] }, false],
+      [{ project_id: {}, namespace_id: 2 }, false],
+      [{ project_id: 1, namespace_id: {} }, false],
+      ['foo', false],
+      [123, false],
+      [[], false]
+    ]
+  end
+
+  with_them do
+    it 'validates data' do
+      constructor = -> { described_class.new(data: data) }
+
+      if valid
+        expect { constructor.call }.not_to raise_error
+      else
+        expect { constructor.call }.to raise_error(Gitlab::EventStore::InvalidEvent)
+      end
+    end
+  end
+end

spec/services/pages/delete_service_spec.rb

@@ -43,4 +43,10 @@
       service.execute
     end.to change { PagesDeployment.count }.by(-1)
   end
+
+  it 'publishes a ProjectDeleted event with project id and namespace id' do
+    expected_data = { project_id: project.id, namespace_id: project.namespace_id }
+
+    expect { service.execute }.to publish_event(Pages::PageDeletedEvent).with(expected_data)
+  end
 end