debian-mirror-gitlab/spec/initializers/database_config_spec.rb

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# frozen_string_literal: true
require 'spec_helper'
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RSpec.describe 'Database config initializer' do
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subject do
load Rails.root.join('config/initializers/database_config.rb')
end
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around do |example|
original_config = ActiveRecord::Base.connection_db_config
example.run
ActiveRecord::Base.establish_connection(original_config)
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
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
before do
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
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
end
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context "and the existing pool size is larger than the max number of worker threads" do
before do
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
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
end
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context "when specifying headroom through an ENV variable" do
let(:headroom) { 15 }
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before do
stub_database_config(pool_size: 1)
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
expect { subject }.to change { Gitlab::Database.config['pool'] }
.from(1)
.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
end
def stub_database_config(pool_size:)
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original_config = Gitlab::Database.config
config = original_config.dup
config['pool'] = pool_size
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allow(Gitlab::Database).to receive(:config).and_return(config)
end
end