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# frozen_string_literal: true
module Gitlab
module Database
module LoadBalancing
class SidekiqClientMiddleware
include Gitlab::Utils::StrongMemoize
def call(worker_class, job, _queue, _redis_pool)
# Mailers can't be constantized
worker_class = worker_class.to_s.safe_constantize
if load_balancing_enabled?(worker_class)
job['worker_data_consistency'] = worker_class.get_data_consistency
set_data_consistency_locations!(job) unless job['wal_locations']
else
job['worker_data_consistency'] = ::WorkerAttributes::DEFAULT_DATA_CONSISTENCY
end
yield
end
private
def load_balancing_enabled?(worker_class)
worker_class &&
worker_class.include?(::ApplicationWorker) &&
worker_class.utilizes_load_balancing_capabilities? &&
worker_class.get_data_consistency_feature_flag_enabled?
end
def set_data_consistency_locations!(job)
locations = {}
::Gitlab::Database::LoadBalancing.each_load_balancer do |lb|
if (location = wal_location_for(lb))
locations[lb.name] = location
end
end
job['wal_locations'] = locations
end
def wal_location_for(load_balancer)
# When only using the primary there's no need for any WAL queries.
return if load_balancer.primary_only?
if ::Gitlab::Database::LoadBalancing::Session.current.use_primary?
load_balancer.primary_write_location
else
load_balancer.host.database_replica_location
end
end
end
end
end
end
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