55 lines
1.7 KiB
Ruby
55 lines
1.7 KiB
Ruby
# frozen_string_literal: true
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class BackgroundMigrationWorker
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include ApplicationWorker
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# The minimum amount of time between processing two jobs of the same migration
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# class.
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#
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# This interval is set to 5 minutes so autovacuuming and other maintenance
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# related tasks have plenty of time to clean up after a migration has been
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# performed.
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MIN_INTERVAL = 5.minutes.to_i
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# Performs the background migration.
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#
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# See Gitlab::BackgroundMigration.perform for more information.
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#
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# class_name - The class name of the background migration to run.
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# arguments - The arguments to pass to the migration class.
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def perform(class_name, arguments = [])
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should_perform, ttl = perform_and_ttl(class_name)
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if should_perform
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Gitlab::BackgroundMigration.perform(class_name, arguments)
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else
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# If the lease could not be obtained this means either another process is
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# running a migration of this class or we ran one recently. In this case
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# we'll reschedule the job in such a way that it is picked up again around
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# the time the lease expires.
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self.class.perform_in(ttl || MIN_INTERVAL, class_name, arguments)
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end
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end
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def perform_and_ttl(class_name)
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if always_perform?
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# In test environments `perform_in` will run right away. This can then
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# lead to stack level errors in the above `#perform`. To work around this
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# we'll just perform the migration right away in the test environment.
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[true, nil]
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else
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lease = lease_for(class_name)
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[lease.try_obtain, lease.ttl]
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end
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end
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def lease_for(class_name)
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Gitlab::ExclusiveLease
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.new("#{self.class.name}:#{class_name}", timeout: MIN_INTERVAL)
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end
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def always_perform?
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Rails.env.test?
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end
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end
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