53 lines
2.0 KiB
Ruby
53 lines
2.0 KiB
Ruby
# frozen_string_literal: true
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ActiveRecord::Base.singleton_class.attr_accessor :load_balancing_proxy
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Gitlab::Database.main.disable_prepared_statements
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Gitlab::Application.configure do |config|
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config.middleware.use(Gitlab::Database::LoadBalancing::RackMiddleware)
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end
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# This hijacks the "connection" method to ensure both
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# `ActiveRecord::Base.connection` and all models use the same load
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# balancing proxy.
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ActiveRecord::Base.singleton_class.prepend(Gitlab::Database::LoadBalancing::ActiveRecordProxy)
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# The load balancer needs to be configured immediately, and re-configured after
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# forking. This ensures queries that run before forking use the load balancer,
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# and queries running after a fork don't run into any errors when using dead
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# database connections.
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#
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# See https://gitlab.com/gitlab-org/gitlab/-/merge_requests/63485 for more
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# information.
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setup = proc do
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lb = Gitlab::Database::LoadBalancing::LoadBalancer.new(
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Gitlab::Database::LoadBalancing.configuration,
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primary_only: !Gitlab::Database::LoadBalancing.enable_replicas?
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)
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ActiveRecord::Base.load_balancing_proxy =
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Gitlab::Database::LoadBalancing::ConnectionProxy.new(lb)
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# Populate service discovery immediately if it is configured
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Gitlab::Database::LoadBalancing.perform_service_discovery
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end
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setup.call
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# Database queries may be run before we fork, so we must set up the load
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# balancer as early as possible. When we do fork, we need to make sure all the
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# hosts are disconnected.
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Gitlab::Cluster::LifecycleEvents.on_before_fork do
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# When forking, we don't want to wait until the connections aren't in use any
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# more, as this could delay the boot cycle.
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Gitlab::Database::LoadBalancing.proxy.load_balancer.disconnect!(timeout: 0)
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end
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# Service discovery only needs to run in the worker processes, as the main one
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# won't be running many (if any) database queries.
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Gitlab::Cluster::LifecycleEvents.on_worker_start do
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setup.call
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Gitlab::Database::LoadBalancing.start_service_discovery
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end
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