General cleanup

app/models/clusters/applications/helm.rb

@@ -9,7 +9,7 @@ module Clusters
 
       belongs_to :cluster, class_name: 'Clusters::Cluster', foreign_key: :cluster_id
 
-      default_value_for :version, Gitlab::Clusters::Helm::HELM_VERSION
+      default_value_for :version, Gitlab::Kubernetes::Helm::HELM_VERSION
 
       def name
         NAME

app/services/clusters/base_helm_service.rb

@@ -17,7 +17,7 @@ module Clusters
     end
 
     def helm_api
-      @helm ||= Gitlab::Clusters::Helm.new(kubeclient)
+      @helm ||= Gitlab::Kubernetes::Helm.new(kubeclient)
     end
   end
 end

app/services/clusters/install_app_service.rb

@@ -15,7 +15,6 @@ module Clusters
       rescue KubeException => ke
         app.make_errored!("Kubernetes error: #{ke.message}")
       rescue StandardError => e
-        Rails.logger.warn(e.message)
         app.make_errored!("Can't start installation process")
       end
     end

app/services/clusters/install_tiller_service.rb

-module Clusters
-  class InstallTillerService < BaseService
-    def execute
-      ensure_namespace
-      install
-    end
-
-    private
-
-    def kubernetes_service
-      return @kubernetes_service if defined?(@kubernetes_service)
-
-      @kubernetes_service = project&.kubernetes_service
-    end
-
-    def ensure_namespace
-      kubernetes_service&.ensure_namespace!
-    end
-
-    def install
-      kubernetes_service&.helm_client&.init!
-    end
-  end
-end

db/migrate/20171031100710_create_clusters_kubernetes_helm_apps.rb

 class CreateClustersKubernetesHelmApps < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
   def change
     create_table :clusters_applications_helm do |t|
       t.references :cluster, null: false, unique: true, foreign_key: { on_delete: :cascade }

lib/gitlab/clusters/helm.rb → lib/gitlab/kubernetes/helm.rb

 module Gitlab
-  module Clusters
+  module Kubernetes
     class Helm
-      Error = Class.new(StandardError)
       HELM_VERSION = '2.7.0'.freeze
       NAMESPACE = 'gitlab-managed-apps'.freeze
       COMMAND_SCRIPT = <<-EOS.freeze
@@ -18,12 +17,11 @@ module Gitlab
       end
 
       def init!
-        ensure_namespace!
-        @kubeclient.create_pod(pod_resource(OpenStruct.new(name: 'helm')))
+        install(OpenStruct.new(name: 'helm'))
       end
 
       def install(app)
-        ensure_namespace!
+        create_namespace! unless has_namespace?
         @kubeclient.create_pod(pod_resource(app))
       end
 
@@ -86,18 +84,24 @@ module Gitlab
         "install #{app.chart} --name #{app.name} --namespace #{NAMESPACE}"
       end
 
-      def ensure_namespace!
+      def has_namespace?
+        return @has_namespace if defined?(@has_namespace)
+
         begin
           @kubeclient.get_namespace(NAMESPACE)
+          @has_namespace = true
         rescue KubeException => ke
           raise ke unless ke.error_code == 404
+          false
+        end
+      end
 
-          namespace_resource = ::Kubeclient::Resource.new
-          namespace_resource.metadata = {}
-          namespace_resource.metadata.name = NAMESPACE
+      def create_namespace!
+        namespace_resource = ::Kubeclient::Resource.new
+        namespace_resource.metadata = {}
+        namespace_resource.metadata.name = NAMESPACE
 
-          @kubeclient.create_namespace(namespace_resource)
-        end
+        @kubeclient.create_namespace(namespace_resource)
       end
     end
   end