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|
# frozen_string_literal: true
module Gitlab
module Database
module LoadBalancing
# Class for setting up load balancing of a specific model.
class Setup
attr_reader :model, :configuration
def initialize(model, start_service_discovery: false)
@model = model
@configuration = Configuration.for_model(model)
@start_service_discovery = start_service_discovery
end
def setup
configure_connection
setup_connection_proxy
setup_service_discovery
::Gitlab::Database::LoadBalancing::Logger.debug(
event: :setup,
model: model.name,
start_service_discovery: @start_service_discovery
)
end
def configure_connection
db_config_object = @model.connection_db_config
hash = db_config_object.configuration_hash.merge(
prepared_statements: false,
pool: Gitlab::Database.default_pool_size
)
hash_config = ActiveRecord::DatabaseConfigurations::HashConfig.new(
db_config_object.env_name,
db_config_object.name,
hash
)
@model.establish_connection(hash_config)
end
def setup_connection_proxy
# We just use a simple `class_attribute` here so we don't need to
# inject any modules and/or expose unnecessary methods.
setup_class_attribute(:load_balancer, load_balancer)
setup_class_attribute(:connection, ConnectionProxy.new(load_balancer))
setup_class_attribute(:sticking, Sticking.new(load_balancer))
end
def setup_service_discovery
return unless configuration.service_discovery_enabled?
sv = ServiceDiscovery.new(load_balancer, **configuration.service_discovery)
sv.perform_service_discovery
sv.start if @start_service_discovery
end
def load_balancer
@load_balancer ||= LoadBalancer.new(configuration)
end
private
def setup_class_attribute(attribute, value)
@model.class_attribute(attribute)
@model.public_send("#{attribute}=", value) # rubocop:disable GitlabSecurity/PublicSend
end
def active_record_base?
@model == ActiveRecord::Base
end
end
end
end
end
|
