Shift to class methods for RefreshService

As we don't use any instance attributes and we don't seem to have any
commonalities between the cluster and the project variant.

app/services/clusters/refresh_service.rb

@@ -2,27 +2,31 @@
 
 module Clusters
   class RefreshService
-    def create_or_update_namespaces_for_cluster(cluster)
-      cluster_namespaces = cluster.kubernetes_namespaces
-
-      # Create all namespaces that are missing for each project
-      cluster.all_projects.missing_kubernetes_namespace(cluster_namespaces).each do |project|
+    def self.create_or_update_namespaces_for_cluster(cluster)
+      projects_with_missing_kubernetes_namespaces_for_cluster(cluster).each do |project|
         create_or_update_namespace(cluster, project)
       end
     end
 
-    def create_or_update_namespaces_for_project(project)
-      project_namespaces = project.kubernetes_namespaces
-
-      # Create all namespaces that are missing for each cluster
-      project.all_clusters.missing_kubernetes_namespace(project_namespaces).each do |cluster|
+    def self.create_or_update_namespaces_for_project(project)
+      clusters_with_missing_kubernetes_namespaces_for_project(project).each do |cluster|
         create_or_update_namespace(cluster, project)
       end
     end
 
-    private
+    def self.projects_with_missing_kubernetes_namespaces_for_cluster(cluster)
+      cluster.all_projects.missing_kubernetes_namespace(cluster.kubernetes_namespaces)
+    end
+
+    private_class_method :projects_with_missing_kubernetes_namespaces_for_cluster
+
+    def self.clusters_with_missing_kubernetes_namespaces_for_project(project)
+      project.all_clusters.missing_kubernetes_namespace(project.kubernetes_namespaces)
+    end
+
+    private_class_method :clusters_with_missing_kubernetes_namespaces_for_project
 
-    def create_or_update_namespace(cluster, project)
+    def self.create_or_update_namespace(cluster, project)
       kubernetes_namespace = cluster.find_or_initialize_kubernetes_namespace_for_project(project)
 
       ::Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService.new(
@@ -30,5 +34,7 @@ module Clusters
         kubernetes_namespace: kubernetes_namespace
       ).execute
     end
+
+    private_class_method :create_or_update_namespace
   end
 end

app/workers/cluster_platform_configure_worker.rb

@@ -6,7 +6,7 @@ class ClusterPlatformConfigureWorker
 
   def perform(cluster_id)
     Clusters::Cluster.find_by_id(cluster_id).try do |cluster|
-      Clusters::RefreshService.new.create_or_update_namespaces_for_cluster(cluster)
+      Clusters::RefreshService.create_or_update_namespaces_for_cluster(cluster)
     end
   end
 end

app/workers/cluster_project_configure_worker.rb

@@ -7,6 +7,6 @@ class ClusterProjectConfigureWorker
   def perform(project_id)
     project = Project.find(project_id)
 
-    ::Clusters::RefreshService.new.create_or_update_namespaces_for_project(project)
+    ::Clusters::RefreshService.create_or_update_namespaces_for_project(project)
   end
 end

spec/services/clusters/refresh_service_spec.rb

@@ -29,11 +29,11 @@ describe Clusters::RefreshService do
     end
   end
 
-  describe '#create_or_update_namespaces_for_cluster' do
+  describe '.create_or_update_namespaces_for_cluster' do
     let(:cluster) { create(:cluster, :provided_by_user, :project) }
     let(:project) { cluster.project }
 
-    subject { described_class.new.create_or_update_namespaces_for_cluster(cluster) }
+    subject { described_class.create_or_update_namespaces_for_cluster(cluster) }
 
     context 'cluster is project level' do
       include_examples 'creates a kubernetes namespace'
@@ -64,10 +64,10 @@ describe Clusters::RefreshService do
     end
   end
 
-  describe '#create_or_update_namespaces_for_project' do
+  describe '.create_or_update_namespaces_for_project' do
     let(:project) { create(:project) }
 
-    subject { described_class.new.create_or_update_namespaces_for_project(project) }
+    subject { described_class.create_or_update_namespaces_for_project(project) }
 
     it 'creates no kubernetes namespaces' do
       expect { subject }.not_to change(project.kubernetes_namespaces, :count)