Extract ClusterWaitForAppInstallationWorker logic into a service

app/services/clusters/check_app_installation_progress_service.rb

+module Clusters
+  class CheckAppInstallationProgressService < BaseHelmService
+    def execute
+      return unless app.installing?
+
+      FetchAppInstallationStatusService.new(app).execute do |phase, log|
+        case phase
+        when 'Succeeded'
+          if app.make_installed
+            FinalizeAppInstallationService.new(app).execute
+          else
+            app.make_errored!("Failed to update app record; #{app.errors}")
+          end
+        when 'Failed'
+          app.make_errored!(log || 'Installation silently failed')
+          FinalizeAppInstallationService.new(app).execute
+        else
+          if Time.now.utc - app.updated_at.to_time.utc > ClusterWaitForAppInstallationWorker::TIMEOUT
+            app.make_errored!('App installation timeouted')
+          else
+            ClusterWaitForAppInstallationWorker.perform_in(
+              ClusterWaitForAppInstallationWorker::EAGER_INTERVAL, app.name, app.id)
+          end
+        end
+      end
+    end
+  end
+end

app/services/clusters/install_app_service.rb

@@ -14,7 +14,7 @@ module Clusters
         end
       rescue KubeException => ke
         app.make_errored!("Kubernetes error: #{ke.message}")
-      rescue StandardError => e
+      rescue StandardError
         app.make_errored!("Can't start installation process")
       end
     end

app/workers/cluster_wait_for_app_installation_worker.rb

@@ -9,25 +9,7 @@ class ClusterWaitForAppInstallationWorker
 
   def perform(app_name, app_id)
     find_app(app_name, app_id) do |app|
-      Clusters::FetchAppInstallationStatusService.new(app).execute do |phase, log|
-        case phase
-        when 'Succeeded'
-          if app.make_installed
-            Clusters::FinalizeAppInstallationService.new(app).execute
-          else
-            app.make_errored!("Failed to update app record; #{app.errors}")
-          end
-        when 'Failed'
-          app.make_errored!(log || 'Installation silently failed')
-          Clusters::FinalizeAppInstallationService.new(app).execute
-        else
-          if Time.now.utc - app.updated_at.to_time.utc > TIMEOUT
-            app.make_errored!('App installation timeouted')
-          else
-            ClusterWaitForAppInstallationWorker.perform_in(EAGER_INTERVAL, app.name, app.id)
-          end
-        end
-      end
+      Clusters::CheckAppInstallationProgressService.new(app).execute
     end
   end
 end