Revert "Merge branch 'revert-drop-gcp-clusters-table' into 'master'"

changelogs/unreleased/drop-gcp-cluster-table.yml

+---
+title: Drop gcp_clusters table
+merge_request: 22713
+author:
+type: other

db/migrate/20181031190558_drop_fk_gcp_clusters_table.rb

+# frozen_string_literal: true
+
+class DropFkGcpClustersTable < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    remove_foreign_key_if_exists :gcp_clusters, column: :project_id
+    remove_foreign_key_if_exists :gcp_clusters, column: :user_id
+    remove_foreign_key_if_exists :gcp_clusters, column: :service_id
+  end
+
+  def down
+    add_foreign_key_if_not_exists :gcp_clusters, :projects, column: :project_id, on_delete: :cascade
+    add_foreign_key_if_not_exists :gcp_clusters, :users, column: :user_id, on_delete: :nullify
+    add_foreign_key_if_not_exists :gcp_clusters, :services, column: :service_id, on_delete: :nullify
+  end
+
+  private
+
+  def add_foreign_key_if_not_exists(source, target, column:, on_delete:)
+    return unless table_exists?(source)
+    return if foreign_key_exists?(source, target, column: column)
+
+    add_concurrent_foreign_key(source, target, column: column, on_delete: on_delete)
+  end
+
+  def remove_foreign_key_if_exists(table, column:)
+    return unless table_exists?(table)
+    return unless foreign_key_exists?(table, column: column)
+
+    remove_foreign_key(table, column: column)
+  end
+end

db/migrate/20181031190559_drop_gcp_clusters_table.rb

+# frozen_string_literal: true
+
+class DropGcpClustersTable < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    drop_table :gcp_clusters
+  end
+
+  def down
+    create_table :gcp_clusters do |t|
+      # Order columns by best align scheme
+      t.references :project, null: false, index: { unique: true }, foreign_key: { on_delete: :cascade }
+      t.references :user, foreign_key: { on_delete: :nullify }
+      t.references :service, foreign_key: { on_delete: :nullify }
+      t.integer :status
+      t.integer :gcp_cluster_size, null: false
+
+      # Timestamps
+      t.datetime_with_timezone :created_at, null: false
+      t.datetime_with_timezone :updated_at, null: false
+
+      # Enable/disable
+      t.boolean :enabled, default: true
+
+      # General
+      t.text :status_reason
+
+      # k8s integration specific
+      t.string :project_namespace
+
+      # Cluster details
+      t.string :endpoint
+      t.text :ca_cert
+      t.text :encrypted_kubernetes_token
+      t.string :encrypted_kubernetes_token_iv
+      t.string :username
+      t.text :encrypted_password
+      t.string :encrypted_password_iv
+
+      # GKE
+      t.string :gcp_project_id, null: false
+      t.string :gcp_cluster_zone, null: false
+      t.string :gcp_cluster_name, null: false
+      t.string :gcp_machine_type
+      t.string :gcp_operation_id
+      t.text :encrypted_gcp_token
+      t.string :encrypted_gcp_token_iv
+    end
+  end
+end

db/schema.rb

@@ -936,35 +936,6 @@ ActiveRecord::Schema.define(version: 20181107054254) do
 
   add_index "forked_project_links", ["forked_to_project_id"], name: "index_forked_project_links_on_forked_to_project_id", unique: true, using: :btree
 
-  create_table "gcp_clusters", force: :cascade do |t|
-    t.integer "project_id", null: false
-    t.integer "user_id"
-    t.integer "service_id"
-    t.integer "status"
-    t.integer "gcp_cluster_size", null: false
-    t.datetime_with_timezone "created_at", null: false
-    t.datetime_with_timezone "updated_at", null: false
-    t.boolean "enabled", default: true
-    t.text "status_reason"
-    t.string "project_namespace"
-    t.string "endpoint"
-    t.text "ca_cert"
-    t.text "encrypted_kubernetes_token"
-    t.string "encrypted_kubernetes_token_iv"
-    t.string "username"
-    t.text "encrypted_password"
-    t.string "encrypted_password_iv"
-    t.string "gcp_project_id", null: false
-    t.string "gcp_cluster_zone", null: false
-    t.string "gcp_cluster_name", null: false
-    t.string "gcp_machine_type"
-    t.string "gcp_operation_id"
-    t.text "encrypted_gcp_token"
-    t.string "encrypted_gcp_token_iv"
-  end
-
-  add_index "gcp_clusters", ["project_id"], name: "index_gcp_clusters_on_project_id", unique: true, using: :btree
-
   create_table "gpg_key_subkeys", force: :cascade do |t|
     t.integer "gpg_key_id", null: false
     t.binary "keyid"
@@ -2450,9 +2421,6 @@ ActiveRecord::Schema.define(version: 20181107054254) do
   add_foreign_key "fork_network_members", "projects", on_delete: :cascade
   add_foreign_key "fork_networks", "projects", column: "root_project_id", name: "fk_e7b436b2b5", on_delete: :nullify
   add_foreign_key "forked_project_links", "projects", column: "forked_to_project_id", name: "fk_434510edb0", on_delete: :cascade
-  add_foreign_key "gcp_clusters", "projects", on_delete: :cascade
-  add_foreign_key "gcp_clusters", "services", on_delete: :nullify
-  add_foreign_key "gcp_clusters", "users", on_delete: :nullify
   add_foreign_key "gpg_key_subkeys", "gpg_keys", on_delete: :cascade
   add_foreign_key "gpg_keys", "users", on_delete: :cascade
   add_foreign_key "gpg_signatures", "gpg_key_subkeys", on_delete: :nullify