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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)
worker_class = worker.class
strategy = select_load_balancing_strategy(worker_class, job)
job['load_balancing_strategy'] = strategy.to_s
if use_primary?(strategy)
Session.current.use_primary!
elsif strategy == :retry
raise JobReplicaNotUpToDate, "Sidekiq job #{worker_class} JID-#{job['jid']} couldn't use the replica."\
" Replica was not up to date."
else
# this means we selected an up-to-date replica, but there is nothing to do in this case.
end
yield
ensure
clear
end
private
def clear
load_balancer.release_host
Session.clear_session
end
def use_primary?(strategy)
strategy.start_with?('primary')
end
def select_load_balancing_strategy(worker_class, job)
return :primary unless load_balancing_available?(worker_class)
location = job['database_write_location'] || job['database_replica_location']
return :primary_no_wal unless location
if replica_caught_up?(location)
# Happy case: we can read from a replica.
retried_before?(worker_class, job) ? :replica_retried : :replica
elsif can_retry?(worker_class, job)
# Optimistic case: The worker allows retries and we have retries left.
:retry
else
# Sad case: we need to fall back to the primary.
:primary
end
end
def load_balancing_available?(worker_class)
worker_class.include?(::ApplicationWorker) &&
worker_class.utilizes_load_balancing_capabilities? &&
worker_class.get_data_consistency_feature_flag_enabled?
end
def can_retry?(worker_class, job)
worker_class.get_data_consistency == :delayed && not_yet_retried?(job)
end
def retried_before?(worker_class, job)
worker_class.get_data_consistency == :delayed && !not_yet_retried?(job)
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)
load_balancer.select_up_to_date_host(location)
end
end
end
end
end
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