117 lines
3.1 KiB
Ruby
117 lines
3.1 KiB
Ruby
# frozen_string_literal: true
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require 'digest'
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module Gitlab
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module SidekiqMiddleware
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module DuplicateJobs
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# This class defines an identifier of a job in a queue
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# The identifier based on a job's class and arguments.
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#
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# As strategy decides when to keep track of the job in redis and when to
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# remove it.
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#
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# Storing the deduplication key in redis can be done by calling `check!`
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# check returns the `jid` of the job if it was scheduled, or the `jid` of
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# the duplicate job if it was already scheduled
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#
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# When new jobs can be scheduled again, the strategy calls `#delete`.
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class DuplicateJob
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DUPLICATE_KEY_TTL = 6.hours
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attr_reader :existing_jid
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def initialize(job, queue_name, strategy: :until_executing)
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@job = job
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@queue_name = queue_name
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@strategy = strategy
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end
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# This will continue the middleware chain if the job should be scheduled
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# It will return false if the job needs to be cancelled
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def schedule(&block)
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Strategies.for(strategy).new(self).schedule(job, &block)
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end
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# This will continue the server middleware chain if the job should be
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# executed.
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# It will return false if the job should not be executed.
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def perform(&block)
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Strategies.for(strategy).new(self).perform(job, &block)
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end
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# This method will return the jid that was set in redis
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def check!
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read_jid = nil
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Sidekiq.redis do |redis|
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redis.multi do |multi|
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redis.set(idempotency_key, jid, ex: DUPLICATE_KEY_TTL, nx: true)
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read_jid = redis.get(idempotency_key)
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end
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end
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self.existing_jid = read_jid.value
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end
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def delete!
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Sidekiq.redis do |redis|
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redis.del(idempotency_key)
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end
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end
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def duplicate?
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raise "Call `#check!` first to check for existing duplicates" unless existing_jid
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jid != existing_jid
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end
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def droppable?
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idempotent? && duplicate?
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end
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private
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attr_reader :queue_name, :strategy, :job
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attr_writer :existing_jid
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def worker_class_name
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job['class']
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end
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def arguments
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job['args']
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end
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def jid
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job['jid']
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end
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def idempotency_key
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@idempotency_key ||= "#{namespace}:#{idempotency_hash}"
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end
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def idempotency_hash
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Digest::SHA256.hexdigest(idempotency_string)
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end
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def namespace
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"#{Gitlab::Redis::Queues::SIDEKIQ_NAMESPACE}:duplicate:#{queue_name}"
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end
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def idempotency_string
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"#{worker_class_name}:#{arguments.join('-')}"
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end
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def idempotent?
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worker_class = worker_class_name.to_s.safe_constantize
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return false unless worker_class
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return false unless worker_class.respond_to?(:idempotent?)
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worker_class.idempotent?
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end
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end
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end
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end
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end
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