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# frozen_string_literal: true
module Gitlab
module Database
module MigrationHelpers
module AutomaticLockWritesOnTables
extend ActiveSupport::Concern
included do
class_attribute :skip_automatic_lock_on_writes
end
def exec_migration(connection, direction)
return super if %w[main ci].exclude?(Gitlab::Database.db_config_name(connection))
return super if automatic_lock_on_writes_disabled?
# This compares the tables only on the `public` schema. Partitions are not affected
tables = connection.tables
super
new_tables = connection.tables - tables
new_tables.each do |table_name|
lock_writes_on_table(connection, table_name) if should_lock_writes_on_table?(table_name)
end
end
private
def automatic_lock_on_writes_disabled?
# Feature flags are set on the main database, see tables features/feature_gates.
# That is why we switch the ActiveRecord::Base.connection temporarily here back to the 'main' database
# for the cases when the migration is targeting another database, like the 'ci' database.
with_restored_connection_stack do |_|
Gitlab::Database::QueryAnalyzers::RestrictAllowedSchemas.with_suppressed do
skip_automatic_lock_on_writes ||
Gitlab::Utils.to_boolean(ENV['SKIP_AUTOMATIC_LOCK_ON_WRITES']) ||
Feature.disabled?(:automatic_lock_writes_on_table, type: :ops)
end
end
end
def should_lock_writes_on_table?(table_name)
# currently gitlab_schema represents only present existing tables, this is workaround for deleted tables
# that should be skipped as they will be removed in a future migration.
return false if Gitlab::Database::GitlabSchema::DELETED_TABLES[table_name]
table_schema = Gitlab::Database::GitlabSchema.table_schema(table_name.to_s, undefined: false)
if table_schema.nil?
error_message = <<~ERROR
No gitlab_schema is defined for the table #{table_name}. Please consider
adding it to the database dictionary.
More info: https://docs.gitlab.com/ee/development/database/database_dictionary.html
ERROR
raise error_message
end
return false unless %i[gitlab_main gitlab_ci].include?(table_schema)
Gitlab::Database.gitlab_schemas_for_connection(connection).exclude?(table_schema)
end
def lock_writes_on_table(connection, table_name)
database_name = Gitlab::Database.db_config_name(connection)
LockWritesManager.new(
table_name: table_name,
connection: connection,
database_name: database_name,
logger: Logger.new($stdout)
).lock_writes
end
end
end
end
end
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