80 lines
2.3 KiB
Ruby
80 lines
2.3 KiB
Ruby
# 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
|