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# frozen_string_literal: true
module Gitlab
module Database
module LoadBalancing
class SidekiqServerMiddleware
JobReplicaNotUpToDate = Class.new(StandardError)
def call(worker, job, _queue)
if requires_primary?(worker.class, job)
Session.current.use_primary!
end
yield
ensure
clear
end
private
def clear
load_balancer.release_host
Session.clear_session
end
def requires_primary?(worker_class, job)
return true unless worker_class.include?(::ApplicationWorker)
return true unless worker_class.utilizes_load_balancing_capabilities?
return true unless worker_class.get_data_consistency_feature_flag_enabled?
location = job['database_write_location'] || job['database_replica_location']
return true unless location
job_data_consistency = worker_class.get_data_consistency
job[:data_consistency] = job_data_consistency.to_s
if replica_caught_up?(location)
job[:database_chosen] = 'replica'
false
elsif job_data_consistency == :delayed && not_yet_retried?(job)
job[:database_chosen] = 'retry'
raise JobReplicaNotUpToDate, "Sidekiq job #{worker_class} JID-#{job['jid']} couldn't use the replica."\
" Replica was not up to date."
else
job[:database_chosen] = 'primary'
true
end
end
def not_yet_retried?(job)
# if `retry_count` is `nil` it indicates that this job was never retried
# the `0` indicates that this is a first retry
job['retry_count'].nil?
end
def load_balancer
LoadBalancing.proxy.load_balancer
end
def replica_caught_up?(location)
if Feature.enabled?(:sidekiq_load_balancing_rotate_up_to_date_replica)
load_balancer.select_up_to_date_host(location)
else
load_balancer.host.caught_up?(location)
end
end
end
end
end
end
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