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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)
# Once we add support for multiple databases to our load balancer, we would use something like this:
# job['wal_locations'] = Gitlab::Database::DATABASES.transform_values do |connection|
# connection.load_balancer.primary_write_location
# end
#
job['wal_locations'] = { Gitlab::Database::MAIN_DATABASE_NAME.to_sym => wal_location } if wal_location
end
def wal_location
strong_memoize(:wal_location) do
if Session.current.use_primary?
load_balancer.primary_write_location
else
load_balancer.host.database_replica_location
end
end
end
def load_balancer
LoadBalancing.proxy.load_balancer
end
end
end
end
end
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