Migrate existing data from KubernetesService to Clusters::Platforms::Kubernetes

db/post_migrate/20171124104327_migrate_kubernetes_service_to_new_clusters_architectures.rb

+class MigrateKubernetesServiceToNewClustersArchitectures < ActiveRecord::Migration
+  DOWNTIME = false
+  DEFAULT_KUBERNETES_SERVICE_CLUSTER_NAME = 'KubernetesService'
+
+  class Cluster < ActiveRecord::Base
+    self.table_name = 'clusters'
+
+    has_many :cluster_projects, class_name: 'ClustersProject'
+    has_many :projects, through: :cluster_projects, class_name: 'Project'
+    has_one :provider_gcp, class_name: 'ProvidersGcp'
+    has_one :platform_kubernetes, class_name: 'PlatformsKubernetes'
+
+    attr_encrypted :token,
+      mode: :per_attribute_iv,
+      key: Gitlab::Application.secrets.db_key_base,
+      algorithm: 'aes-256-cbc'
+
+    accepts_nested_attributes_for :provider_gcp
+    accepts_nested_attributes_for :platform_kubernetes
+
+    enum platform_type: {
+      kubernetes: 1
+    }
+
+    enum provider_type: {
+      user: 0,
+      gcp: 1
+    }
+  end
+
+  class Project < ActiveRecord::Base
+    self.table_name = 'projects'
+
+    has_one :cluster_project, class_name: 'ClustersProject'
+    has_one :cluster, through: :cluster_project, class_name: 'Cluster'
+  end
+
+  class Service < ActiveRecord::Base
+    include EachBatch
+
+    self.table_name = 'services'
+
+    belongs_to :project, class_name: 'Project'
+
+    # When users create a cluster, KubernetesService is automatically synchronized
+    # with Platforms::Kubernetes due to delegate Kubernetes specific logic.
+    # We only target unmanaged KubernetesService records.
+    scope :unmanaged_kubernetes_service, -> do
+      joins(
+        'INNER JOIN projects ON projects.id = services.project_id' \
+        'INNER JOIN cluster_projects ON projects.id = cluster_projects.project_id' \
+        'INNER JOIN clusters ON cluster_projects.cluster_id = clusters.id' \
+        'INNER JOIN cluster_platforms_kubernetes ON cluster_platforms_kubernetes.cluster_id = clusters.id')
+      .where(
+        "services.category = 'deployment' AND services.type = 'KubernetesService'" \
+        "AND (" \
+        "    cluster_projects.project_id IS NULL" \
+        "    OR" \
+        "    services.properties NOT LIKE CONCAT('%', cluster_platforms_kubernetes.api_url, '%')" \
+        ")")
+    end
+  end
+
+  class ClustersProject < ActiveRecord::Base
+    self.table_name = 'cluster_projects'
+
+    belongs_to :cluster, class_name: 'Cluster'
+    belongs_to :project, class_name: 'Project'
+  end
+
+  class ProvidersGcp < ActiveRecord::Base
+    self.table_name = 'cluster_providers_gcp'
+  end
+
+  class PlatformsKubernetes < ActiveRecord::Base
+    self.table_name = 'cluster_platforms_kubernetes'
+  end
+
+  def up
+    Service.unmanaged_kubernetes_service
+      .find_each(batch_size: 1) do |kubernetes_service|
+        Cluster.create(
+          enabled: kubernetes_service.active,
+          user_id: nil, # KubernetesService doesn't have
+          name: DEFAULT_KUBERNETES_SERVICE_CLUSTER_NAME,
+          provider_type: Cluster.provider_types[:user],
+          platform_type: Cluster.platform_types[:kubernetes],
+          projects: [kubernetes_service.project],
+          platform_kubernetes_attributes: {
+            api_url: kubernetes_service.api_url,
+            ca_cert: kubernetes_service.ca_pem,
+            namespace: kubernetes_service.namespace,
+            username: nil, # KubernetesService doesn't have
+            encrypted_password: nil, # KubernetesService doesn't have
+            encrypted_password_iv: nil, # KubernetesService doesn't have
+            token: kubernetes_service.token # encrypted_token and encrypted_token_iv
+          } )
+    end
+  end
+
+  def down
+    # noop
+  end
+end