85 lines
2.3 KiB
Ruby
85 lines
2.3 KiB
Ruby
# frozen_string_literal: true
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require 'spec_helper'
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RSpec.describe 'Database config initializer' do
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subject do
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load Rails.root.join('config/initializers/database_config.rb')
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end
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around do |example|
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original_config = ActiveRecord::Base.connection_db_config
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example.run
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ActiveRecord::Base.establish_connection(original_config)
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end
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before do
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allow(Gitlab::Runtime).to receive(:max_threads).and_return(max_threads)
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end
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let(:max_threads) { 8 }
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context "no existing pool size is set" do
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before do
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stub_database_config(pool_size: nil)
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end
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it "sets it based on the max number of worker threads" do
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expect { subject }.to change { Gitlab::Database.config['pool'] }.from(nil).to(18)
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expect(ActiveRecord::Base.connection_db_config.pool).to eq(18)
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end
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end
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context "the existing pool size is smaller than the max number of worker threads" do
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before do
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stub_database_config(pool_size: 1)
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end
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it "sets it based on the max number of worker threads" do
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expect { subject }.to change { Gitlab::Database.config['pool'] }.from(1).to(18)
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expect(ActiveRecord::Base.connection_db_config.pool).to eq(18)
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end
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end
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context "and the existing pool size is larger than the max number of worker threads" do
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before do
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stub_database_config(pool_size: 100)
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end
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it "sets it based on the max number of worker threads" do
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expect { subject }.to change { Gitlab::Database.config['pool'] }.from(100).to(18)
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expect(ActiveRecord::Base.connection_db_config.pool).to eq(18)
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end
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end
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context "when specifying headroom through an ENV variable" do
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let(:headroom) { 15 }
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before do
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stub_database_config(pool_size: 1)
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stub_env("DB_POOL_HEADROOM", headroom)
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end
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it "adds headroom on top of the calculated size" do
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expect { subject }.to change { Gitlab::Database.config['pool'] }
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.from(1)
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.to(max_threads + headroom)
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expect(ActiveRecord::Base.connection_db_config.pool).to eq(max_threads + headroom)
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end
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end
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def stub_database_config(pool_size:)
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original_config = Gitlab::Database.config
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config = original_config.dup
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config['pool'] = pool_size
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allow(Gitlab::Database).to receive(:config).and_return(config)
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end
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end
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