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# frozen_string_literal: true
module Database
module BatchedBackgroundMigration
module SingleDatabaseWorker
extend ActiveSupport::Concern
include ApplicationWorker
include CronjobQueue # rubocop:disable Scalability/CronWorkerContext
LEASE_TIMEOUT_MULTIPLIER = 3
MINIMUM_LEASE_TIMEOUT = 10.minutes.freeze
INTERVAL_VARIANCE = 5.seconds.freeze
included do
data_consistency :always
feature_category :database
idempotent!
end
class_methods do
# :nocov:
def tracking_database
raise NotImplementedError, "#{self.name} does not implement #{__method__}"
end
# :nocov:
def lease_key
name.demodulize.underscore
end
end
def perform
unless base_model
Sidekiq.logger.info(
class: self.class.name,
database: self.class.tracking_database,
message: 'skipping migration execution for unconfigured database')
return
end
Gitlab::Database::SharedModel.using_connection(base_model.connection) do
break unless Feature.enabled?(:execute_batched_migrations_on_schedule, type: :ops, default_enabled: :yaml) && active_migration
with_exclusive_lease(active_migration.interval) do
# Now that we have the exclusive lease, reload migration in case another process has changed it.
# This is a temporary solution until we have better concurrency handling around job execution
#
# We also have to disable this cop, because ApplicationRecord aliases reset to reload, but our database
# models don't inherit from ApplicationRecord
active_migration.reload # rubocop:disable Cop/ActiveRecordAssociationReload
run_active_migration if active_migration.active? && active_migration.interval_elapsed?(variance: INTERVAL_VARIANCE)
end
end
end
private
def active_migration
@active_migration ||= Gitlab::Database::BackgroundMigration::BatchedMigration.active_migration
end
def run_active_migration
Gitlab::Database::BackgroundMigration::BatchedMigrationRunner.new(connection: base_model.connection).run_migration_job(active_migration)
end
def base_model
@base_model ||= Gitlab::Database.database_base_models[self.class.tracking_database]
end
def with_exclusive_lease(interval)
timeout = [interval * LEASE_TIMEOUT_MULTIPLIER, MINIMUM_LEASE_TIMEOUT].max
lease = Gitlab::ExclusiveLease.new(self.class.lease_key, timeout: timeout)
yield if lease.try_obtain
ensure
lease&.cancel
end
end
end
end
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