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