Commit 477d2e1a authored by Mayra Cabrera's avatar Mayra Cabrera Committed by Andreas Brandl

Add background migration for Kubernetes Namespaces

parent d19a6f68
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---
title: Add background migration to populate Kubernetes namespaces
merge_request: 22433
author:
type: added
# frozen_string_literal: true
class EnqueuePopulateClusterKubernetesNamespace < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = false
MIGRATION = 'PopulateClusterKubernetesNamespaceTable'.freeze
disable_ddl_transaction!
def up
BackgroundMigrationWorker.perform_async(MIGRATION)
end
def down
Clusters::KubernetesNamespace.delete_all
end
end
# frozen_string_literal: true
#
# rubocop:disable Style/Documentation
module Gitlab
module BackgroundMigration
class PopulateClusterKubernetesNamespaceTable
include Gitlab::Database::MigrationHelpers
BATCH_SIZE = 1_000
module Migratable
class KubernetesNamespace < ActiveRecord::Base
self.table_name = 'clusters_kubernetes_namespaces'
end
class ClusterProject < ActiveRecord::Base
include EachBatch
self.table_name = 'cluster_projects'
belongs_to :project
def self.with_no_kubernetes_namespace
where.not(id: Migratable::KubernetesNamespace.select(:cluster_project_id))
end
def namespace
slug = "#{project.path}-#{project.id}".downcase
slug.gsub(/[^-a-z0-9]/, '-').gsub(/^-+/, '')
end
def service_account
"#{namespace}-service-account"
end
end
class Project < ActiveRecord::Base
self.table_name = 'projects'
end
end
def perform
cluster_projects_with_no_kubernetes_namespace.each_batch(of: BATCH_SIZE) do |cluster_projects_batch, index|
sql_values = sql_values_for(cluster_projects_batch)
insert_into_cluster_kubernetes_namespace(sql_values)
end
end
private
def cluster_projects_with_no_kubernetes_namespace
Migratable::ClusterProject.with_no_kubernetes_namespace
end
def sql_values_for(cluster_projects)
cluster_projects.map do |cluster_project|
values_for_cluster_project(cluster_project)
end
end
def values_for_cluster_project(cluster_project)
{
cluster_project_id: cluster_project.id,
cluster_id: cluster_project.cluster_id,
project_id: cluster_project.project_id,
namespace: cluster_project.namespace,
service_account_name: cluster_project.service_account,
created_at: 'NOW()',
updated_at: 'NOW()'
}
end
def insert_into_cluster_kubernetes_namespace(rows)
Gitlab::Database.bulk_insert(Migratable::KubernetesNamespace.table_name,
rows,
disable_quote: [:created_at, :updated_at])
end
end
end
end
# frozen_string_literal: true
require 'spec_helper'
describe Gitlab::BackgroundMigration::PopulateClusterKubernetesNamespaceTable, :migration, schema: 20181022173835 do
let(:migration) { described_class.new }
let(:clusters) { create_list(:cluster, 10, :project, :provided_by_gcp) }
before do
clusters
end
shared_examples 'consistent kubernetes namespace attributes' do
it 'should populate namespace and service account information' do
subject
clusters_with_namespace.each do |cluster|
project = cluster.project
cluster_project = cluster.cluster_projects.first
namespace = "#{project.path}-#{project.id}"
kubernetes_namespace = cluster.reload.kubernetes_namespace
expect(kubernetes_namespace).to be_present
expect(kubernetes_namespace.cluster_project).to eq(cluster_project)
expect(kubernetes_namespace.project).to eq(cluster_project.project)
expect(kubernetes_namespace.cluster).to eq(cluster_project.cluster)
expect(kubernetes_namespace.namespace).to eq(namespace)
expect(kubernetes_namespace.service_account_name).to eq("#{namespace}-service-account")
end
end
end
subject { migration.perform }
context 'when no Clusters::Project has a Clusters::KubernetesNamespace' do
let(:cluster_projects) { Clusters::Project.all }
it 'should create a Clusters::KubernetesNamespace per Clusters::Project' do
expect do
subject
end.to change(Clusters::KubernetesNamespace, :count).by(cluster_projects.count)
end
it_behaves_like 'consistent kubernetes namespace attributes' do
let(:clusters_with_namespace) { clusters }
end
end
context 'when every Clusters::Project has Clusters::KubernetesNamespace' do
before do
clusters.each do |cluster|
create(:cluster_kubernetes_namespace,
cluster_project: cluster.cluster_projects.first,
cluster: cluster,
project: cluster.project)
end
end
it 'should not create any Clusters::KubernetesNamespace' do
expect do
subject
end.not_to change(Clusters::KubernetesNamespace, :count)
end
end
context 'when only some Clusters::Project have Clusters::KubernetesNamespace related' do
let(:with_kubernetes_namespace) { clusters.first(6) }
let(:with_no_kubernetes_namespace) { clusters.last(4) }
before do
with_kubernetes_namespace.each do |cluster|
create(:cluster_kubernetes_namespace,
cluster_project: cluster.cluster_projects.first,
cluster: cluster,
project: cluster.project)
end
end
it 'creates limited number of Clusters::KubernetesNamespace' do
expect do
subject
end.to change(Clusters::KubernetesNamespace, :count).by(with_no_kubernetes_namespace.count)
end
it 'should not modify clusters with Clusters::KubernetesNamespace' do
subject
with_kubernetes_namespace.each do |cluster|
expect(cluster.kubernetes_namespaces.count).to eq(1)
end
end
it_behaves_like 'consistent kubernetes namespace attributes' do
let(:clusters_with_namespace) { with_no_kubernetes_namespace }
end
end
end
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