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# frozen_string_literal: true
module Database
module BatchedBackgroundMigration
module ExecutionWorker
extend ActiveSupport::Concern
include ExclusiveLeaseGuard
include Gitlab::Utils::StrongMemoize
include ApplicationWorker
include LimitedCapacity::Worker
INTERVAL_VARIANCE = 5.seconds.freeze
LEASE_TIMEOUT_MULTIPLIER = 3
MAX_RUNNING_MIGRATIONS = 4
included do
data_consistency :always
feature_category :database
queue_namespace :batched_background_migrations
end
class_methods do
def max_running_jobs
MAX_RUNNING_MIGRATIONS
end
# We have to overirde this one, as we want
# arguments passed as is, and not duplicated
def perform_with_capacity(args)
worker = new
worker.remove_failed_jobs
bulk_perform_async(args) # rubocop:disable Scalability/BulkPerformWithContext
end
end
def remaining_work_count(*args)
0 # the cron worker is the only source of new jobs
end
def max_running_jobs
self.class.max_running_jobs
end
def perform_work(database_name, migration_id)
self.database_name = database_name
return unless enabled?
return if shares_db_config?
Gitlab::Database::SharedModel.using_connection(base_model.connection) do
self.migration = find_migration(migration_id)
break unless migration
try_obtain_lease do
run_migration_job if executable_migration?
end
end
end
private
attr_accessor :database_name, :migration
def enabled?
Feature.enabled?(:execute_batched_migrations_on_schedule, type: :ops)
end
def shares_db_config?
Gitlab::Database.db_config_share_with(base_model.connection_db_config).present?
end
def base_model
strong_memoize(:base_model) do
Gitlab::Database.database_base_models[database_name]
end
end
def find_migration(id)
Gitlab::Database::BackgroundMigration::BatchedMigration.find_executable(id, connection: base_model.connection)
end
def lease_key
@lease_key ||= [
self.class.name.underscore,
'database_name',
database_name,
'table_name',
migration.table_name
].join(':')
end
def lease_timeout
migration.interval * LEASE_TIMEOUT_MULTIPLIER
end
def executable_migration?
migration.active? && migration.interval_elapsed?(variance: INTERVAL_VARIANCE)
end
def run_migration_job
Gitlab::Database::BackgroundMigration::BatchedMigrationRunner.new(connection: base_model.connection)
.run_migration_job(migration)
end
end
end
end
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