Create k8s namespace for project in group clusters

AFAIK the only relevant place is Projects::CreateService, this gets
called when user creates a new project, forks a new project and does
those things via the api.

Also create k8s namespace for new group hierarchy
when transferring project between groups

Uses new Refresh service to create k8s namespaces

- Ensure we use Cluster#cluster_project

If a project has multiple clusters (EE), using Project#cluster_project
is not guaranteed to return the cluster_project for this cluster. So
switch to using Cluster#cluster_project - at this stage a cluster can
only have 1 cluster_project.

Also, remove rescue so that sidekiq can retry

app/models/clusters/cluster.rb

@@ -87,6 +87,12 @@ module Clusters
 
     scope :default_environment, -> { where(environment_scope: DEFAULT_ENVIRONMENT) }
 
+    scope :missing_kubernetes_namespace, -> (kubernetes_namespaces) do
+      subquery = kubernetes_namespaces.select('1').where('clusters_kubernetes_namespaces.cluster_id = clusters.id')
+
+      where('NOT EXISTS (?)', subquery)
+    end
+
     # Returns an ordered list of group clusters order from clusters of closest
     # group up to furthest ancestor group
     def self.ordered_group_clusters_for_project(project_id)
@@ -161,11 +167,17 @@ module Clusters
       platform_kubernetes.kubeclient if kubernetes?
     end
 
-    def find_or_initialize_kubernetes_namespace(cluster_project)
+    def find_or_initialize_kubernetes_namespace_for_project(project)
+      if project_type?
         kubernetes_namespaces.find_or_initialize_by(
-        project: cluster_project.project,
+          project: project,
           cluster_project: cluster_project
         )
+      else
+        kubernetes_namespaces.find_or_initialize_by(
+          project: project
+        )
+      end
     end
 
     def allow_user_defined_namespace?

app/models/project.rb

@@ -383,6 +383,12 @@ class Project < ActiveRecord::Base
     .where(project_ci_cd_settings: { group_runners_enabled: true })
   end
 
+  scope :missing_kubernetes_namespace, -> (kubernetes_namespaces) do
+    subquery = kubernetes_namespaces.select('1').where('clusters_kubernetes_namespaces.project_id = projects.id')
+
+    where('NOT EXISTS (?)', subquery)
+  end
+
   enum auto_cancel_pending_pipelines: { disabled: 0, enabled: 1 }
 
   chronic_duration_attr :build_timeout_human_readable, :build_timeout, default: 3600

app/services/clusters/refresh_service.rb

+# frozen_string_literal: true
+
+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|
+        kubernetes_namespace = cluster.find_or_initialize_kubernetes_namespace_for_project(project)
+
+        ::Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService.new(
+          cluster: cluster,
+          kubernetes_namespace: kubernetes_namespace
+        ).execute
+      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|
+        kubernetes_namespace = cluster.find_or_initialize_kubernetes_namespace_for_project(project)
+
+        ::Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService.new(
+          cluster: cluster,
+          kubernetes_namespace: kubernetes_namespace
+        ).execute
+      end
+    end
+  end
+end

app/services/projects/create_service.rb

@@ -96,6 +96,8 @@ module Projects
       current_user.invalidate_personal_projects_count
 
       create_readme if @initialize_with_readme
+
+      configure_group_clusters_for_project
     end
 
     # Refresh the current user's authorizations inline (so they can access the
@@ -121,6 +123,10 @@ module Projects
       Files::CreateService.new(@project, current_user, commit_attrs).execute
     end
 
+    def configure_group_clusters_for_project
+      ClusterProjectConfigureWorker.perform_async(@project.id)
+    end
+
     def skip_wiki?
       !@project.feature_available?(:wiki, current_user) || @skip_wiki
     end

app/services/projects/transfer_service.rb

@@ -54,6 +54,7 @@ module Projects
       end
 
       attempt_transfer_transaction
+      configure_group_clusters_for_project
     end
     # rubocop: enable CodeReuse/ActiveRecord
 
@@ -162,5 +163,9 @@ module Projects
         @new_namespace.full_path
       )
     end
+
+    def configure_group_clusters_for_project
+      ClusterProjectConfigureWorker.perform_async(project.id)
+    end
   end
 end

app/workers/all_queues.yml

@@ -29,6 +29,7 @@
 - gcp_cluster:wait_for_cluster_creation
 - gcp_cluster:cluster_wait_for_ingress_ip_address
 - gcp_cluster:cluster_platform_configure
+- gcp_cluster:cluster_project_configure
 
 - github_import_advance_stage
 - github_importer:github_import_import_diff_note

app/workers/cluster_platform_configure_worker.rb

@@ -6,17 +6,7 @@ class ClusterPlatformConfigureWorker
 
   def perform(cluster_id)
     Clusters::Cluster.find_by_id(cluster_id).try do |cluster|
-      next unless cluster.cluster_project
-
-      kubernetes_namespace = cluster.find_or_initialize_kubernetes_namespace(cluster.cluster_project)
-
-      Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService.new(
-        cluster: cluster,
-        kubernetes_namespace: kubernetes_namespace
-      ).execute
+      Clusters::RefreshService.new.create_or_update_namespaces_for_cluster(cluster)
     end
-
-  rescue ::Kubeclient::HttpError => err
-    Rails.logger.error "Failed to create/update Kubernetes namespace for cluster_id: #{cluster_id} with error: #{err.message}"
   end
 end

app/workers/cluster_project_configure_worker.rb

+# frozen_string_literal: true
+
+class ClusterProjectConfigureWorker
+  include ApplicationWorker
+  include ClusterQueue
+
+  def perform(project_id)
+    project = Project.find(project_id)
+
+    ::Clusters::RefreshService.new.create_or_update_namespaces_for_project(project)
+  end
+end

spec/models/clusters/cluster_spec.rb

@@ -92,6 +92,26 @@ describe Clusters::Cluster do
     it { is_expected.to contain_exactly(cluster) }
   end
 
+  describe '.missing_kubernetes_namespace' do
+    let!(:cluster) { create(:cluster, :provided_by_gcp, :project) }
+    let(:project) { cluster.project }
+    let(:kubernetes_namespaces) { project.kubernetes_namespaces }
+
+    subject do
+      described_class.joins(:projects).where(projects: { id: project.id }).missing_kubernetes_namespace(kubernetes_namespaces)
+    end
+
+    it { is_expected.to contain_exactly(cluster) }
+
+    context 'kubernetes namespace exists' do
+      before do
+        create(:cluster_kubernetes_namespace, project: project, cluster: cluster)
+      end
+
+      it { is_expected.to be_empty }
+    end
+  end
+
   describe 'validation' do
     subject { cluster.valid? }
 

spec/models/project_spec.rb

@@ -155,6 +155,24 @@ describe Project do
     it { is_expected.to include_module(Sortable) }
   end
 
+  describe '.missing_kubernetes_namespace' do
+    let!(:project) { create(:project) }
+    let!(:cluster) { create(:cluster, :provided_by_user, :group) }
+    let(:kubernetes_namespaces) { project.kubernetes_namespaces }
+
+    subject { described_class.missing_kubernetes_namespace(kubernetes_namespaces) }
+
+    it { is_expected.to contain_exactly(project) }
+
+    context 'kubernetes namespace exists' do
+      before do
+        create(:cluster_kubernetes_namespace, project: project, cluster: cluster)
+      end
+
+      it { is_expected.to be_empty }
+    end
+  end
+
   describe 'validation' do
     let!(:project) { create(:project) }
 

spec/services/clusters/refresh_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Clusters::RefreshService do
+  shared_examples 'creates a kubernetes namespace' do
+    let(:token) { 'aaaaaa' }
+    let(:service_account_creator) { double(Clusters::Gcp::Kubernetes::CreateServiceAccountService, execute: true) }
+    let(:secrets_fetcher) { double(Clusters::Gcp::Kubernetes::FetchKubernetesTokenService, execute: token) }
+
+    it 'creates a kubernetes namespace' do
+      expect(Clusters::Gcp::Kubernetes::CreateServiceAccountService).to receive(:namespace_creator).and_return(service_account_creator)
+      expect(Clusters::Gcp::Kubernetes::FetchKubernetesTokenService).to receive(:new).and_return(secrets_fetcher)
+
+      expect { subject }.to change(project.kubernetes_namespaces, :count)
+
+      kubernetes_namespace = cluster.kubernetes_namespaces.first
+      expect(kubernetes_namespace).to be_present
+      expect(kubernetes_namespace.project).to eq(project)
+    end
+  end
+
+  shared_examples 'does not create a kubernetes namespace' do
+    it 'does not create a new kubernetes namespace' do
+      expect(Clusters::Gcp::Kubernetes::CreateServiceAccountService).not_to receive(:namespace_creator)
+      expect(Clusters::Gcp::Kubernetes::FetchKubernetesTokenService).not_to receive(:new)
+
+      expect { subject }.not_to change(Clusters::KubernetesNamespace, :count)
+    end
+  end
+
+  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) }
+
+    context 'cluster is project level' do
+      include_examples 'creates a kubernetes namespace'
+
+      context 'when project already has kubernetes namespace' do
+        before do
+          create(:cluster_kubernetes_namespace, project: project, cluster: cluster)
+        end
+
+        include_examples 'does not create a kubernetes namespace'
+      end
+    end
+
+    context 'cluster is group level' do
+      let(:cluster) { create(:cluster, :provided_by_user, :group) }
+      let(:group) { cluster.group }
+      let(:project) { create(:project, group: group) }
+
+      include_examples 'creates a kubernetes namespace'
+
+      context 'when project already has kubernetes namespace' do
+        before do
+          create(:cluster_kubernetes_namespace, project: project, cluster: cluster)
+        end
+
+        include_examples 'does not create a kubernetes namespace'
+      end
+    end
+  end
+
+  describe '#create_or_update_namespaces_for_project' do
+    let(:project) { create(:project) }
+
+    subject { described_class.new.create_or_update_namespaces_for_project(project) }
+
+    it 'creates no kubernetes namespaces' do
+      expect { subject }.not_to change(project.kubernetes_namespaces, :count)
+    end
+
+    context 'project has a project cluster' do
+      let!(:cluster) { create(:cluster, :provided_by_gcp, cluster_type: :project_type, projects: [project]) }
+
+      include_examples 'creates a kubernetes namespace'
+
+      context 'when project already has kubernetes namespace' do
+        before do
+          create(:cluster_kubernetes_namespace, project: project, cluster: cluster)
+        end
+
+        include_examples 'does not create a kubernetes namespace'
+      end
+    end
+
+    context 'project belongs to a group cluster' do
+      let!(:cluster) { create(:cluster, :provided_by_gcp, :group) }
+
+      let(:group) { cluster.group }
+      let(:project) { create(:project, group: group) }
+
+      include_examples 'creates a kubernetes namespace'
+
+      context 'when project already has kubernetes namespace' do
+        before do
+          create(:cluster_kubernetes_namespace, project: project, cluster: cluster)
+        end
+
+        include_examples 'does not create a kubernetes namespace'
+      end
+    end
+  end
+end

spec/services/projects/create_service_spec.rb

@@ -261,6 +261,32 @@ describe Projects::CreateService, '#execute' do
     end
   end
 
+  context 'when group has kubernetes cluster' do
+    let(:group_cluster) { create(:cluster, :group, :provided_by_gcp) }
+    let(:group) { group_cluster.group }
+
+    let(:token) { 'aaaa' }
+    let(:service_account_creator) { double(Clusters::Gcp::Kubernetes::CreateServiceAccountService, execute: true) }
+    let(:secrets_fetcher) { double(Clusters::Gcp::Kubernetes::FetchKubernetesTokenService, execute: token) }
+
+    before do
+      group.add_owner(user)
+
+      expect(Clusters::Gcp::Kubernetes::CreateServiceAccountService).to receive(:namespace_creator).and_return(service_account_creator)
+      expect(Clusters::Gcp::Kubernetes::FetchKubernetesTokenService).to receive(:new).and_return(secrets_fetcher)
+    end
+
+    it 'creates kubernetes namespace for the project' do
+      project = create_project(user, opts.merge!(namespace_id: group.id))
+
+      expect(project).to be_valid
+
+      kubernetes_namespace = group_cluster.kubernetes_namespaces.first
+      expect(kubernetes_namespace).to be_present
+      expect(kubernetes_namespace.project).to eq(project)
+    end
+  end
+
   context 'when there is an active service template' do
     before do
       create(:service, project: nil, template: true, active: true)

spec/services/projects/transfer_service_spec.rb

@@ -62,6 +62,32 @@ describe Projects::TransferService do
 
       expect(rugged_config['gitlab.fullpath']).to eq "#{group.full_path}/#{project.path}"
     end
+
+    context 'new group has a kubernetes cluster' do
+      let(:group_cluster) { create(:cluster, :group, :provided_by_gcp) }
+      let(:group) { group_cluster.group }
+
+      let(:token) { 'aaaa' }
+      let(:service_account_creator) { double(Clusters::Gcp::Kubernetes::CreateServiceAccountService, execute: true) }
+      let(:secrets_fetcher) { double(Clusters::Gcp::Kubernetes::FetchKubernetesTokenService, execute: token) }
+
+      subject { transfer_project(project, user, group) }
+
+      before do
+        expect(Clusters::Gcp::Kubernetes::CreateServiceAccountService).to receive(:namespace_creator).and_return(service_account_creator)
+        expect(Clusters::Gcp::Kubernetes::FetchKubernetesTokenService).to receive(:new).and_return(secrets_fetcher)
+      end
+
+      it 'creates kubernetes namespace for the project' do
+        subject
+
+        expect(project.kubernetes_namespaces.count).to eq(1)
+
+        kubernetes_namespace = group_cluster.kubernetes_namespaces.first
+        expect(kubernetes_namespace).to be_present
+        expect(kubernetes_namespace.project).to eq(project)
+      end
+    end
   end
 
   context 'when transfer fails' do

spec/workers/cluster_platform_configure_worker_spec.rb

@@ -2,7 +2,43 @@
 
 require 'spec_helper'
 
-describe ClusterPlatformConfigureWorker, '#execute' do
+describe ClusterPlatformConfigureWorker, '#perform' do
+  let(:worker) { described_class.new }
+
+  context 'when group cluster' do
+    let(:cluster) { create(:cluster, :group, :provided_by_gcp) }
+    let(:group) { cluster.group }
+
+    context 'when group has no projects' do
+      it 'does not create a namespace' do
+        expect_any_instance_of(Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService).not_to receive(:execute)
+
+        worker.perform(cluster.id)
+      end
+    end
+
+    context 'when group has a project' do
+      let!(:project) { create(:project, group: group) }
+
+      it 'creates a namespace for the project' do
+        expect_any_instance_of(Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService).to receive(:execute).once
+
+        worker.perform(cluster.id)
+      end
+    end
+
+    context 'when group has project in a sub-group' do
+      let!(:subgroup) { create(:group, parent: group) }
+      let!(:project) { create(:project, group: subgroup) }
+
+      it 'creates a namespace for the project' do
+        expect_any_instance_of(Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService).to receive(:execute).once
+
+        worker.perform(cluster.id)
+      end
+    end
+  end
+
   context 'when provider type is gcp' do
     let(:cluster) { create(:cluster, :project, :provided_by_gcp) }
 
@@ -30,18 +66,4 @@ describe ClusterPlatformConfigureWorker, '#execute' do
       described_class.new.perform(123)
     end
   end
-
-  context 'when kubeclient raises error' do
-    let(:cluster) { create(:cluster, :project) }
-
-    it 'rescues and logs the error' do
-      allow_any_instance_of(Clusters::Gcp::Kubernetes::CreateOrUpdateNamespaceService).to receive(:execute).and_raise(::Kubeclient::HttpError.new(500, 'something baaaad happened', ''))
-
-      expect(Rails.logger)
-        .to receive(:error)
-        .with("Failed to create/update Kubernetes namespace for cluster_id: #{cluster.id} with error: something baaaad happened")
-
-      described_class.new.perform(cluster.id)
-    end
-  end
 end