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# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Metrics::Samplers::DatabaseSampler do
subject { described_class.new }
it_behaves_like 'metrics sampler', 'DATABASE_SAMPLER'
describe '#sample' do
before do
described_class::METRIC_DESCRIPTIONS.each_key do |metric|
allow(subject.metrics[metric]).to receive(:set)
end
end
context 'for ActiveRecord::Base' do
let(:labels) do
{
class: 'ActiveRecord::Base',
host: ApplicationRecord.database.config['host'],
port: ApplicationRecord.database.config['port']
}
end
context 'when the database is connected' do
it 'samples connection pool statistics' do
expect(subject.metrics[:size]).to receive(:set).with(labels, a_value >= 1)
expect(subject.metrics[:connections]).to receive(:set).with(labels, a_value >= 1)
expect(subject.metrics[:busy]).to receive(:set).with(labels, a_value >= 1)
expect(subject.metrics[:dead]).to receive(:set).with(labels, a_value >= 0)
expect(subject.metrics[:waiting]).to receive(:set).with(labels, a_value >= 0)
subject.sample
end
end
context 'when the database is not connected' do
before do
allow(ActiveRecord::Base).to receive(:connected?).and_return(false)
end
it 'records no samples' do
expect(subject.metrics[:size]).not_to receive(:set).with(labels, anything)
subject.sample
end
end
end
end
end
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