API to delete self monitoring project

* An admin API to trigger an async job that will delete the self
monitoring project.

* Also move common request specs into shared_examples.

app/controllers/admin/application_settings_controller.rb

@@ -102,7 +102,9 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
     elsif SelfMonitoringProjectCreateWorker.in_progress?(job_id)
       ::Gitlab::PollingInterval.set_header(response, interval: 3_000)
 
-      render status: :accepted, json: { message: _('Job is in progress') }
+      render status: :accepted, json: {
+        message: _('Job to create self-monitoring project is in progress')
+      }
 
     else
       render status: :bad_request, json: {
@@ -112,6 +114,49 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
     end
   end
 
+  def delete_self_monitoring_project
+    return self_monitoring_project_not_implemented unless Feature.enabled?(:self_monitoring_project)
+
+    job_id = SelfMonitoringProjectDeleteWorker.perform_async
+
+    render status: :accepted, json: {
+      job_id: job_id,
+      monitor_status: status_delete_self_monitoring_project_admin_application_settings_path
+    }
+  end
+
+  def status_delete_self_monitoring_project
+    return self_monitoring_project_not_implemented unless Feature.enabled?(:self_monitoring_project)
+
+    job_id = params[:job_id].to_s
+
+    unless job_id.length <= PARAM_JOB_ID_MAX_SIZE
+      return render status: :bad_request, json: {
+        message: _('Parameter "job_id" cannot exceed length of %{job_id_max_size}' %
+          { job_id_max_size: PARAM_JOB_ID_MAX_SIZE })
+      }
+    end
+
+    if Gitlab::CurrentSettings.instance_administration_project_id.nil?
+      render status: :ok, json: {
+        message: _('Self-monitoring project has been successfully deleted')
+      }
+
+    elsif SelfMonitoringProjectDeleteWorker.in_progress?(job_id)
+      ::Gitlab::PollingInterval.set_header(response, interval: 3_000)
+
+      render status: :accepted, json: {
+        message: _('Job to delete self-monitoring project is in progress')
+      }
+
+    else
+      render status: :bad_request, json: {
+        message: _('Self-monitoring project was not deleted. Please check logs ' \
+          'for any error messages')
+      }
+    end
+  end
+
   private
 
   def self_monitoring_data

app/helpers/application_settings_helper.rb

@@ -344,6 +344,12 @@ module ApplicationSettingsHelper
       'status_create_self_monitoring_project_path' =>
         status_create_self_monitoring_project_admin_application_settings_path,
 
+      'delete_self_monitoring_project_path' =>
+        delete_self_monitoring_project_admin_application_settings_path,
+
+      'status_delete_self_monitoring_project_path' =>
+        status_delete_self_monitoring_project_admin_application_settings_path,
+
       'self_monitoring_project_exists' =>
         Gitlab::CurrentSettings.instance_administration_project.present?,
 

config/routes/admin.rb

@@ -119,6 +119,8 @@ namespace :admin do
 
     post :create_self_monitoring_project
     get :status_create_self_monitoring_project
+    delete :delete_self_monitoring_project
+    get :status_delete_self_monitoring_project
   end
 
   resources :labels

locale/gitlab.pot

@@ -10278,9 +10278,6 @@ msgstr ""
 msgid "Job has wrong arguments format."
 msgstr ""
 
-msgid "Job is in progress"
-msgstr ""
-
 msgid "Job is missing the `model_type` argument."
 msgstr ""
 
@@ -10290,6 +10287,12 @@ msgstr ""
 msgid "Job logs and artifacts"
 msgstr ""
 
+msgid "Job to create self-monitoring project is in progress"
+msgstr ""
+
+msgid "Job to delete self-monitoring project is in progress"
+msgstr ""
+
 msgid "Job was retried"
 msgstr ""
 
@@ -16322,6 +16325,12 @@ msgstr ""
 msgid "Self-monitoring project does not exist. Please check logs for any error messages"
 msgstr ""
 
+msgid "Self-monitoring project has been successfully deleted"
+msgstr ""
+
+msgid "Self-monitoring project was not deleted. Please check logs for any error messages"
+msgstr ""
+
 msgid "Send a separate email notification to Developers."
 msgstr ""
 

spec/helpers/application_settings_helper_spec.rb

@@ -76,6 +76,20 @@ describe ApplicationSettingsHelper do
         )
       end
 
+      it 'returns delete_self_monitoring_project_path' do
+        expect(helper.self_monitoring_project_data).to include(
+          'delete_self_monitoring_project_path' =>
+            delete_self_monitoring_project_admin_application_settings_path
+        )
+      end
+
+      it 'returns status_delete_self_monitoring_project_path' do
+        expect(helper.self_monitoring_project_data).to include(
+          'status_delete_self_monitoring_project_path' =>
+            status_delete_self_monitoring_project_admin_application_settings_path
+        )
+      end
+
       it 'returns self_monitoring_project_exists false' do
         expect(helper.self_monitoring_project_data).to include(
           'self_monitoring_project_exists' => false

spec/requests/self_monitoring_project_spec.rb

@@ -60,7 +60,7 @@ describe 'Self-Monitoring project requests' do
           end
 
           it_behaves_like 'sets polling header and returns accepted' do
-            let(:in_progress_message) { 'Job is in progress' }
+            let(:in_progress_message) { 'Job to create self-monitoring project is in progress' }
           end
         end
 
@@ -115,4 +115,110 @@ describe 'Self-Monitoring project requests' do
       end
     end
   end
+
+  describe 'DELETE #delete_self_monitoring_project' do
+    let(:worker_class) { SelfMonitoringProjectDeleteWorker }
+
+    subject { delete delete_self_monitoring_project_admin_application_settings_path }
+
+    it_behaves_like 'not accessible to non-admin users'
+
+    context 'with admin user' do
+      before do
+        login_as(admin)
+      end
+
+      context 'with feature flag disabled' do
+        it_behaves_like 'not accessible if feature flag is disabled'
+      end
+
+      context 'with feature flag enabled' do
+        let(:status_api) { status_delete_self_monitoring_project_admin_application_settings_path }
+
+        it_behaves_like 'triggers async worker, returns sidekiq job_id with response accepted'
+      end
+    end
+  end
+
+  describe 'GET #status_delete_self_monitoring_project' do
+    let(:worker_class) { SelfMonitoringProjectDeleteWorker }
+    let(:job_id) { 'job_id' }
+
+    subject do
+      get status_delete_self_monitoring_project_admin_application_settings_path,
+        params: { job_id: job_id }
+    end
+
+    it_behaves_like 'not accessible to non-admin users'
+
+    context 'with admin user' do
+      before do
+        login_as(admin)
+      end
+
+      context 'with feature flag disabled' do
+        it_behaves_like 'not accessible if feature flag is disabled'
+      end
+
+      context 'with feature flag enabled' do
+        it_behaves_like 'handles invalid job_id'
+
+        context 'when job is in progress' do
+          before do
+            allow(worker_class).to receive(:in_progress?)
+              .with(job_id)
+              .and_return(true)
+
+            stub_application_setting(instance_administration_project_id: 1)
+          end
+
+          it_behaves_like 'sets polling header and returns accepted' do
+            let(:in_progress_message) { 'Job to delete self-monitoring project is in progress' }
+          end
+        end
+
+        context 'when self-monitoring project exists and job does not exist' do
+          before do
+            stub_application_setting(instance_administration_project_id: 1)
+          end
+
+          it 'returns bad_request' do
+            subject
+
+            aggregate_failures do
+              expect(response).to have_gitlab_http_status(:bad_request)
+              expect(json_response).to eq(
+                'message' => 'Self-monitoring project was not deleted. Please check logs ' \
+                  'for any error messages'
+              )
+            end
+          end
+        end
+
+        context 'when self-monitoring project does not exist' do
+          it 'does not need job_id' do
+            get status_delete_self_monitoring_project_admin_application_settings_path
+
+            aggregate_failures do
+              expect(response).to have_gitlab_http_status(:success)
+              expect(json_response).to eq(
+                'message' => 'Self-monitoring project has been successfully deleted'
+              )
+            end
+          end
+
+          it 'returns success with job_id' do
+            subject
+
+            aggregate_failures do
+              expect(response).to have_gitlab_http_status(:success)
+              expect(json_response).to eq(
+                'message' => 'Self-monitoring project has been successfully deleted'
+              )
+            end
+          end
+        end
+      end
+    end
+  end
 end