Create Groups::RepositoryStorageMove class

This commits creates the Groups::RepositoryStorageMove in the database,
and includes a basic class.

changelogs/unreleased/fj-create-group-repository-storage-move-table.yml

+---
+title: Create Groups::RepositoryStorageMove table
+merge_request: 51803
+author:
+type: added

db/migrate/20210115090452_create_group_repository_storage_move.rb

+# frozen_string_literal: true
+
+class CreateGroupRepositoryStorageMove < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    unless table_exists?(:group_repository_storage_moves)
+      with_lock_retries do
+        create_table :group_repository_storage_moves do |t|
+          t.timestamps_with_timezone
+          t.references :group, references: :namespace, column: :group_id, index: true, null: false
+          t.integer :state, limit: 2, default: 1, null: false
+          t.text :source_storage_name, null: false
+          t.text :destination_storage_name, null: false
+
+          t.foreign_key :namespaces, column: :group_id, on_delete: :cascade
+        end
+      end
+    end
+
+    add_text_limit(:group_repository_storage_moves, :source_storage_name, 255, constraint_name: 'group_repository_storage_moves_source_storage_name')
+    add_text_limit(:group_repository_storage_moves, :destination_storage_name, 255, constraint_name: 'group_repository_storage_moves_destination_storage_name')
+  end
+
+  def down
+    with_lock_retries do
+      drop_table :group_repository_storage_moves
+    end
+  end
+end

db/schema_migrations/20210115090452

+5415850ae27c507fd8b1df20951e25b42352f4f9ec8e1402019533170edabdb8
\ No newline at end of file

db/structure.sql

@@ -13042,6 +13042,27 @@ CREATE TABLE group_merge_request_approval_settings (
     allow_author_approval boolean DEFAULT false NOT NULL
 );
 
+CREATE TABLE group_repository_storage_moves (
+    id bigint NOT NULL,
+    created_at timestamp with time zone NOT NULL,
+    updated_at timestamp with time zone NOT NULL,
+    group_id bigint NOT NULL,
+    state smallint DEFAULT 1 NOT NULL,
+    source_storage_name text NOT NULL,
+    destination_storage_name text NOT NULL,
+    CONSTRAINT group_repository_storage_moves_destination_storage_name CHECK ((char_length(destination_storage_name) <= 255)),
+    CONSTRAINT group_repository_storage_moves_source_storage_name CHECK ((char_length(source_storage_name) <= 255))
+);
+
+CREATE SEQUENCE group_repository_storage_moves_id_seq
+    START WITH 1
+    INCREMENT BY 1
+    NO MINVALUE
+    NO MAXVALUE
+    CACHE 1;
+
+ALTER SEQUENCE group_repository_storage_moves_id_seq OWNED BY group_repository_storage_moves.id;
+
 CREATE TABLE group_wiki_repositories (
     shard_id bigint NOT NULL,
     group_id bigint NOT NULL,
@@ -18731,6 +18752,8 @@ ALTER TABLE ONLY group_group_links ALTER COLUMN id SET DEFAULT nextval('group_gr
 
 ALTER TABLE ONLY group_import_states ALTER COLUMN group_id SET DEFAULT nextval('group_import_states_group_id_seq'::regclass);
 
+ALTER TABLE ONLY group_repository_storage_moves ALTER COLUMN id SET DEFAULT nextval('group_repository_storage_moves_id_seq'::regclass);
+
 ALTER TABLE ONLY historical_data ALTER COLUMN id SET DEFAULT nextval('historical_data_id_seq'::regclass);
 
 ALTER TABLE ONLY identities ALTER COLUMN id SET DEFAULT nextval('identities_id_seq'::regclass);
@@ -19967,6 +19990,9 @@ ALTER TABLE ONLY group_import_states
 ALTER TABLE ONLY group_merge_request_approval_settings
     ADD CONSTRAINT group_merge_request_approval_settings_pkey PRIMARY KEY (group_id);
 
+ALTER TABLE ONLY group_repository_storage_moves
+    ADD CONSTRAINT group_repository_storage_moves_pkey PRIMARY KEY (id);
+
 ALTER TABLE ONLY group_wiki_repositories
     ADD CONSTRAINT group_wiki_repositories_pkey PRIMARY KEY (group_id);
 
@@ -21948,6 +21974,8 @@ CREATE INDEX index_group_import_states_on_group_id ON group_import_states USING
 
 CREATE INDEX index_group_import_states_on_user_id ON group_import_states USING btree (user_id) WHERE (user_id IS NOT NULL);
 
+CREATE INDEX index_group_repository_storage_moves_on_group_id ON group_repository_storage_moves USING btree (group_id);
+
 CREATE UNIQUE INDEX index_group_stages_on_group_id_group_value_stream_id_and_name ON analytics_cycle_analytics_group_stages USING btree (group_id, group_value_stream_id, name);
 
 CREATE UNIQUE INDEX index_group_wiki_repositories_on_disk_path ON group_wiki_repositories USING btree (disk_path);
@@ -25258,6 +25286,9 @@ ALTER TABLE ONLY packages_pypi_metadata
 ALTER TABLE ONLY packages_dependency_links
     ADD CONSTRAINT fk_rails_96ef1c00d3 FOREIGN KEY (package_id) REFERENCES packages_packages(id) ON DELETE CASCADE;
 
+ALTER TABLE ONLY group_repository_storage_moves
+    ADD CONSTRAINT fk_rails_982bb5daf1 FOREIGN KEY (group_id) REFERENCES namespaces(id) ON DELETE CASCADE;
+
 ALTER TABLE ONLY resource_label_events
     ADD CONSTRAINT fk_rails_9851a00031 FOREIGN KEY (merge_request_id) REFERENCES merge_requests(id) ON DELETE CASCADE;
 

ee/app/models/ee/group.rb

@@ -51,6 +51,7 @@ module EE
       delegate :enforced_group_managed_accounts?, :enforced_sso?, to: :saml_provider, allow_nil: true
 
       has_one :group_wiki_repository
+      has_many :repository_storage_moves, class_name: 'Groups::RepositoryStorageMove', inverse_of: :container
 
       belongs_to :file_template_project, class_name: "Project"
 

ee/app/models/groups/repository_storage_move.rb

+# frozen_string_literal: true
+
+# Groups::RepositoryStorageMove store details of repository storage moves for a
+# group. For example, moving a group to another gitaly node to help
+# balance storage capacity.
+module Groups
+  class RepositoryStorageMove < ApplicationRecord
+    self.table_name = 'group_repository_storage_moves'
+
+    belongs_to :container, class_name: 'Group', inverse_of: :repository_storage_moves, foreign_key: :group_id
+    alias_attribute :group, :container
+
+    scope :with_groups, -> { includes(container: :route) }
+  end
+end

ee/spec/models/group_spec.rb

@@ -27,6 +27,7 @@ RSpec.describe Group do
     it { is_expected.to have_many(:provisioned_user_details).inverse_of(:provisioned_by_group) }
     it { is_expected.to have_many(:provisioned_users) }
     it { is_expected.to have_one(:group_merge_request_approval_setting) }
+    it { is_expected.to have_many(:repository_storage_moves) }
 
     it_behaves_like 'model with wiki' do
       let(:container) { create(:group, :nested, :wiki_repo) }

ee/spec/models/groups/repository_storage_move_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Groups::RepositoryStorageMove, type: :model do
+  describe 'associations' do
+    it { is_expected.to belong_to(:container).class_name('Group') }
+  end
+end