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# frozen_string_literal: true
module Gitlab
# This module provides helper methods which are intregrated with GitLab::ExclusiveLease
module ExclusiveLeaseHelpers
FailedToObtainLockError = Class.new(StandardError)
##
# This helper method blocks a process/thread until the other process cancel the obrainted lease key.
#
# Note: It's basically discouraged to use this method in the unicorn's thread,
# because it holds the connection until all `retries` is consumed.
# This could potentially eat up all connection pools.
def in_lock(key, ttl: 1.minute, retries: 10, sleep_sec: 0.01.seconds)
raise ArgumentError, 'Key needs to be specified' unless key
lease = Gitlab::ExclusiveLease.new(key, timeout: ttl)
retried = false
until uuid = lease.try_obtain
# Keep trying until we obtain the lease. To prevent hammering Redis too
# much we'll wait for a bit.
sleep(sleep_sec)
(retries -= 1) < 0 ? break : retried ||= true
end
raise FailedToObtainLockError, 'Failed to obtain a lock' unless uuid
yield(retried)
ensure
Gitlab::ExclusiveLease.cancel(key, uuid)
end
end
end
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