101 lines
3.4 KiB
Ruby
101 lines
3.4 KiB
Ruby
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# frozen_string_literal: true
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require 'spec_helper'
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RSpec.describe 'load_balancing', :delete, :reestablished_active_record_base do
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subject(:initialize_load_balancer) do
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load Rails.root.join('config/initializers/load_balancing.rb')
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end
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before do
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# Stub out middleware call, as not idempotent
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allow(Gitlab::Application.instance.middleware).to receive(:use)
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end
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context 'with replica hosts configured' do
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before do
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# Setup host-based load balancing
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# Patch in our load balancer config, simply pointing at the test database twice
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allow(Gitlab::Database::LoadBalancing::Configuration).to receive(:for_model) do |base_model|
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db_host = base_model.connection_pool.db_config.host
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Gitlab::Database::LoadBalancing::Configuration.new(base_model, [db_host, db_host])
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end
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end
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after do
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# reset load balancing to original state
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allow(Gitlab::Database::LoadBalancing::Configuration).to receive(:for_model).and_call_original
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allow(Gitlab::Cluster::LifecycleEvents).to receive(:in_clustered_puma?).and_call_original
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load Rails.root.join('config/initializers/load_balancing.rb')
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end
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it 'configures load balancer with two replica hosts' do
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expect(ApplicationRecord.connection.load_balancer.configuration.hosts.size).to eq(0)
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expect(Ci::ApplicationRecord.connection.load_balancer.configuration.hosts.size).to eq(0)
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initialize_load_balancer
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expect(ApplicationRecord.connection.load_balancer.configuration.hosts.size).to eq(2)
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expect(Ci::ApplicationRecord.connection.load_balancer.configuration.hosts.size).to eq(2)
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end
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context 'for a clustered puma worker' do
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let!(:group) { create(:group, name: 'my group') }
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before do
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# Pretend we are in clustered environment
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allow(Gitlab::Cluster::LifecycleEvents).to receive(:in_clustered_puma?).and_return(true)
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end
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it 'configures load balancer to have two replica hosts' do
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initialize_load_balancer
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simulate_puma_worker do
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expect(ApplicationRecord.connection.load_balancer.configuration.hosts.size).to eq(2)
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expect(Ci::ApplicationRecord.connection.load_balancer.configuration.hosts.size).to eq(2)
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end
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end
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# We tried using Process.fork for a more realistic simulation
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# but run into bugs where GPRC cannot be used before forking processes.
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# See https://gitlab.com/gitlab-org/gitlab/-/issues/333184#note_1081658113
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def simulate_puma_worker
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# Called in https://github.com/rails/rails/blob/6-1-stable/activerecord/lib/active_record/connection_adapters/pool_config.rb#L73
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ActiveRecord::ConnectionAdapters::PoolConfig.discard_pools!
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# Called in config/puma.rb
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Gitlab::Cluster::LifecycleEvents.do_worker_start
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yield
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end
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it 'makes a read query successfully' do
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# Clear any previous sticky writes
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::Gitlab::Database::LoadBalancing::Session.clear_session
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initialize_load_balancer
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group_name = simulate_puma_worker do
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Group.find_by_name('my group').name
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end
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expect(group_name).to eq(group.name)
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end
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it 'makes a write query successfully' do
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initialize_load_balancer
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expect do
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simulate_puma_worker do
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Group.touch_all
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end
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group.reload
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end.to change(group, :updated_at)
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end
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end
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end
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end
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