101 lines
2.6 KiB
Ruby
101 lines
2.6 KiB
Ruby
# frozen_string_literal: true
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#
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# A concern that helps run exactly one instance of a worker, over and over,
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# until it returns false or raises.
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#
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# To ensure the worker is always up, you can schedule it every minute with
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# sidekiq-cron. Excess jobs will immediately exit due to an exclusive lease.
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#
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# The worker must define:
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#
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# - `#perform`
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# - `#lease_timeout`
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#
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# The worker spec should include `it_behaves_like 'reenqueuer'` and
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# `it_behaves_like 'it is rate limited to 1 call per'`.
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#
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# Optionally override `#minimum_duration` to adjust the rate limit.
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#
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# When `#perform` returns false, the job will not be reenqueued. Instead, we
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# will wait for the next one scheduled by sidekiq-cron.
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#
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# #lease_timeout should be longer than the longest possible `#perform`.
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# The lease is normally released in an ensure block, but it is possible to
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# orphan the lease by killing Sidekiq, so it should also be as short as
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# possible. Consider that long-running jobs are generally not recommended.
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# Ideally, every job finishes within 25 seconds because that is the default
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# wait time for graceful termination.
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#
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# Timing: It runs as often as Sidekiq allows. We rate limit with sleep for
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# now: https://gitlab.com/gitlab-org/gitlab/issues/121697
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module Reenqueuer
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extend ActiveSupport::Concern
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prepended do
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include ExclusiveLeaseGuard
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include ReenqueuerSleeper
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sidekiq_options retry: false
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end
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def perform(*args)
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try_obtain_lease do
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reenqueue(*args) do
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ensure_minimum_duration(minimum_duration) do
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super
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end
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end
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end
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end
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private
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def reenqueue(*args)
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self.class.perform_async(*args) if yield
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end
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# Override as needed
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def minimum_duration
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5.seconds
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end
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# We intend to get rid of sleep:
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# https://gitlab.com/gitlab-org/gitlab/issues/121697
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module ReenqueuerSleeper
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# The block will run, and then sleep until the minimum duration. Returns the
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# block's return value.
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#
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# Usage:
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#
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# ensure_minimum_duration(5.seconds) do
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# # do something
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# end
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#
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def ensure_minimum_duration(minimum_duration)
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start_time = Time.now
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result = yield
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sleep_if_time_left(minimum_duration, start_time)
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result
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end
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private
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def sleep_if_time_left(minimum_duration, start_time)
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time_left = calculate_time_left(minimum_duration, start_time)
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sleep(time_left) if time_left > 0
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end
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def calculate_time_left(minimum_duration, start_time)
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minimum_duration - elapsed_time(start_time)
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end
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def elapsed_time(start_time)
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Time.now - start_time
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end
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end
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end
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