76 lines
2.4 KiB
Ruby
76 lines
2.4 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module Database
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module LoadBalancing
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class SidekiqServerMiddleware
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JobReplicaNotUpToDate = Class.new(StandardError)
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def call(worker, job, _queue)
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worker_class = worker.class
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strategy = select_load_balancing_strategy(worker_class, job)
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# This is consumed by ServerMetrics and StructuredLogger to emit metrics so we only
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# make this available when load-balancing is actually utilized.
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job['load_balancing_strategy'] = strategy.to_s if load_balancing_available?(worker_class)
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case strategy
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when :primary, :retry_primary
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Session.current.use_primary!
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when :retry_replica
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raise JobReplicaNotUpToDate, "Sidekiq job #{worker_class} JID-#{job['jid']} couldn't use the replica."\
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" Replica was not up to date."
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when :replica
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# this means we selected an up-to-date replica, but there is nothing to do in this case.
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end
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yield
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ensure
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clear
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end
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private
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def clear
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load_balancer.release_host
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Session.clear_session
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end
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def select_load_balancing_strategy(worker_class, job)
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return :primary unless load_balancing_available?(worker_class)
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location = job['database_write_location'] || job['database_replica_location']
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return :primary unless location
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if replica_caught_up?(location)
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:replica
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elsif worker_class.get_data_consistency == :delayed
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not_yet_retried?(job) ? :retry_replica : :retry_primary
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else
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:primary
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end
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end
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def load_balancing_available?(worker_class)
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worker_class.include?(::ApplicationWorker) &&
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worker_class.utilizes_load_balancing_capabilities? &&
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worker_class.get_data_consistency_feature_flag_enabled?
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end
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def not_yet_retried?(job)
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# if `retry_count` is `nil` it indicates that this job was never retried
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# the `0` indicates that this is a first retry
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job['retry_count'].nil?
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end
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def load_balancer
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LoadBalancing.proxy.load_balancer
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end
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def replica_caught_up?(location)
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load_balancer.select_up_to_date_host(location)
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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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