63 lines
1.4 KiB
Ruby
63 lines
1.4 KiB
Ruby
# frozen_string_literal: true
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#
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# Concern that helps with getting an exclusive lease for running a block
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# of code.
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#
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# `#try_obtain_lease` takes a block which will be run if it was able to
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# obtain the lease. Implement `#lease_timeout` to configure the timeout
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# for the exclusive lease.
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#
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# Optionally override `#lease_key` to set the
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# lease key, it defaults to the class name with underscores.
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#
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# Optionally override `#lease_release?` to prevent the job to
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# be re-executed more often than LEASE_TIMEOUT.
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#
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module ExclusiveLeaseGuard
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extend ActiveSupport::Concern
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def try_obtain_lease
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lease = exclusive_lease.try_obtain
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unless lease
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log_error('Cannot obtain an exclusive lease. There must be another instance already in execution.')
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return
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end
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begin
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yield lease
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ensure
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release_lease(lease) if lease_release?
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end
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end
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def exclusive_lease
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@lease ||= Gitlab::ExclusiveLease.new(lease_key, timeout: lease_timeout)
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end
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def lease_key
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@lease_key ||= self.class.name.underscore
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end
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def lease_timeout
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raise NotImplementedError,
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"#{self.class.name} does not implement #{__method__}"
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end
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def lease_release?
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true
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end
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def release_lease(uuid)
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Gitlab::ExclusiveLease.cancel(lease_key, uuid)
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end
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def renew_lease!
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exclusive_lease.renew
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end
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def log_error(message, extra_args = {})
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Rails.logger.error(message)
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end
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end
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