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module Gitlab
module BackgroundMigration
def self.queue
@queue ||= BackgroundMigrationWorker.sidekiq_options['queue']
end
# Begins stealing jobs from the background migrations queue, blocking the
# caller until all jobs have been completed.
#
# When a migration raises a StandardError is is going to be retries up to
# three times, for example, to recover from a deadlock.
#
# When Exception is being raised, it enqueues the migration again, and
# re-raises the exception.
#
# steal_class - The name of the class for which to steal jobs.
def self.steal(steal_class)
enqueued = Sidekiq::Queue.new(self.queue)
scheduled = Sidekiq::ScheduledSet.new
[scheduled, enqueued].each do |queue|
queue.each do |job|
migration_class, migration_args = job.args
next unless job.queue == self.queue
next unless migration_class == steal_class
begin
perform(migration_class, migration_args, retries: 3) if job.delete
rescue Exception # rubocop:disable Lint/RescueException
BackgroundMigrationWorker # enqueue this migration again
.perform_async(migration_class, migration_args)
raise
end
end
end
end
##
# Performs a background migration.
#
# class_name - The name of the background migration class as defined in the
# Gitlab::BackgroundMigration namespace.
#
# arguments - The arguments to pass to the background migration's "perform"
# method.
def self.perform(class_name, arguments)
const_get(class_name).new.perform(*arguments)
end
end
end
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