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|
# frozen_string_literal: true
require 'spec_helper'
RSpec.describe Gitlab::Utils::UsageData do
describe '#count' do
let(:relation) { double(:relation) }
it 'returns the count when counting succeeds' do
allow(relation).to receive(:count).and_return(1)
expect(described_class.count(relation, batch: false)).to eq(1)
end
it 'returns the fallback value when counting fails' do
stub_const("Gitlab::Utils::UsageData::FALLBACK", 15)
allow(relation).to receive(:count).and_raise(ActiveRecord::StatementInvalid.new(''))
expect(described_class.count(relation, batch: false)).to eq(15)
end
end
describe '#distinct_count' do
let(:relation) { double(:relation) }
it 'returns the count when counting succeeds' do
allow(relation).to receive(:distinct_count_by).and_return(1)
expect(described_class.distinct_count(relation, batch: false)).to eq(1)
end
it 'returns the fallback value when counting fails' do
stub_const("Gitlab::Utils::UsageData::FALLBACK", 15)
allow(relation).to receive(:distinct_count_by).and_raise(ActiveRecord::StatementInvalid.new(''))
expect(described_class.distinct_count(relation, batch: false)).to eq(15)
end
end
describe '#estimate_batch_distinct_count' do
let(:error_rate) { Gitlab::Database::PostgresHll::BatchDistinctCounter::ERROR_RATE } # HyperLogLog is a probabilistic algorithm, which provides estimated data, with given error margin
let(:relation) { double(:relation) }
before do
allow(ActiveRecord::Base.connection).to receive(:transaction_open?).and_return(false)
end
it 'delegates counting to counter class instance' do
buckets = instance_double(Gitlab::Database::PostgresHll::Buckets)
expect_next_instance_of(Gitlab::Database::PostgresHll::BatchDistinctCounter, relation, 'column') do |instance|
expect(instance).to receive(:execute)
.with(batch_size: nil, start: nil, finish: nil)
.and_return(buckets)
end
expect(buckets).to receive(:estimated_distinct_count).and_return(5)
expect(described_class.estimate_batch_distinct_count(relation, 'column')).to eq(5)
end
context 'quasi integration test for different counting parameters' do
# HyperLogLog http://algo.inria.fr/flajolet/Publications/FlFuGaMe07.pdf algorithm
# used in estimate_batch_distinct_count produce probabilistic
# estimations of unique values present in dataset, because of that its results
# are always off by some small factor from real value. However for given
# dataset it provide consistent and deterministic result. In the following context
# analyzed sets consist of values:
# build_needs set: ['1', '2', '3', '4', '5']
# ci_build set ['a', 'b']
# with them, current implementation is expected to consistently report
# 5.217656147118495 and 2.0809220082170614 values
# This test suite is expected to assure, that HyperLogLog implementation
# behaves consistently between changes made to other parts of codebase.
# In case of fine tuning or changes to HyperLogLog algorithm implementation
# one should run in depth analysis of accuracy with supplementary rake tasks
# currently under implementation at https://gitlab.com/gitlab-org/gitlab/-/merge_requests/51118
# and adjust used values in this context accordingly.
let_it_be(:build) { create(:ci_build, name: 'a') }
let_it_be(:another_build) { create(:ci_build, name: 'b') }
let(:model) { Ci::BuildNeed }
let(:column) { :name }
let(:build_needs_estimated_cardinality) { 5.217656147118495 }
let(:ci_builds_estimated_cardinality) { 2.0809220082170614 }
context 'different counting parameters' do
before_all do
1.upto(3) { |i| create(:ci_build_need, name: i, build: build) }
4.upto(5) { |i| create(:ci_build_need, name: i, build: another_build) }
end
it 'counts with symbol passed in column argument' do
expect(described_class.estimate_batch_distinct_count(model, column)).to eq(build_needs_estimated_cardinality)
end
it 'counts with string passed in column argument' do
expect(described_class.estimate_batch_distinct_count(model, column.to_s)).to eq(build_needs_estimated_cardinality)
end
it 'counts with table.column passed in column argument' do
expect(described_class.estimate_batch_distinct_count(model, "#{model.table_name}.#{column}")).to eq(build_needs_estimated_cardinality)
end
it 'counts with Arel passed in column argument' do
expect(described_class.estimate_batch_distinct_count(model, model.arel_table[column])).to eq(build_needs_estimated_cardinality)
end
it 'counts over joined relations' do
expect(described_class.estimate_batch_distinct_count(model.joins(:build), "ci_builds.name")).to eq(ci_builds_estimated_cardinality)
end
it 'counts with :column field with batch_size of 50K' do
expect(described_class.estimate_batch_distinct_count(model, column, batch_size: 50_000)).to eq(build_needs_estimated_cardinality)
end
it 'counts with different number of batches and aggregates total result' do
stub_const('Gitlab::Database::PostgresHll::BatchDistinctCounter::MIN_REQUIRED_BATCH_SIZE', 0)
[1, 2, 4, 5, 6].each { |i| expect(described_class.estimate_batch_distinct_count(model, column, batch_size: i)).to eq(build_needs_estimated_cardinality) }
end
it 'counts with a start and finish' do
expect(described_class.estimate_batch_distinct_count(model, column, start: model.minimum(:id), finish: model.maximum(:id))).to eq(build_needs_estimated_cardinality)
end
end
end
describe 'error handling' do
before do
stub_const("Gitlab::Utils::UsageData::FALLBACK", 3)
stub_const("Gitlab::Utils::UsageData::DISTRIBUTED_HLL_FALLBACK", 4)
end
it 'returns fallback if counter raises WRONG_CONFIGURATION_ERROR' do
expect(described_class.estimate_batch_distinct_count(relation, 'id', start: 1, finish: 0)).to eq 3
end
it 'returns default fallback value when counting fails due to database error' do
allow(Gitlab::Database::PostgresHll::BatchDistinctCounter).to receive(:new).and_raise(ActiveRecord::StatementInvalid.new(''))
expect(described_class.estimate_batch_distinct_count(relation)).to eq(3)
end
it 'logs error and returns DISTRIBUTED_HLL_FALLBACK value when counting raises any error', :aggregate_failures do
error = StandardError.new('')
allow(Gitlab::Database::PostgresHll::BatchDistinctCounter).to receive(:new).and_raise(error)
expect(Gitlab::ErrorTracking).to receive(:track_and_raise_for_dev_exception).with(error)
expect(described_class.estimate_batch_distinct_count(relation)).to eq(4)
end
end
end
describe '#sum' do
let(:relation) { double(:relation) }
it 'returns the count when counting succeeds' do
allow(Gitlab::Database::BatchCount)
.to receive(:batch_sum)
.with(relation, :column, batch_size: 100, start: 2, finish: 3)
.and_return(1)
expect(described_class.sum(relation, :column, batch_size: 100, start: 2, finish: 3)).to eq(1)
end
it 'returns the fallback value when counting fails' do
stub_const("Gitlab::Utils::UsageData::FALLBACK", 15)
allow(Gitlab::Database::BatchCount)
.to receive(:batch_sum)
.and_raise(ActiveRecord::StatementInvalid.new(''))
expect(described_class.sum(relation, :column)).to eq(15)
end
end
describe '#alt_usage_data' do
it 'returns the fallback when it gets an error' do
expect(described_class.alt_usage_data { raise StandardError } ).to eq(-1)
end
it 'returns the evaluated block when give' do
expect(described_class.alt_usage_data { Gitlab::CurrentSettings.uuid } ).to eq(Gitlab::CurrentSettings.uuid)
end
it 'returns the value when given' do
expect(described_class.alt_usage_data(1)).to eq 1
end
end
describe '#redis_usage_data' do
context 'with block given' do
it 'returns the fallback when it gets an error' do
expect(described_class.redis_usage_data { raise ::Redis::CommandError } ).to eq(-1)
end
it 'returns the evaluated block when given' do
expect(described_class.redis_usage_data { 1 }).to eq(1)
end
end
context 'with counter given' do
it 'returns the falback values for all counter keys when it gets an error' do
allow(::Gitlab::UsageDataCounters::WikiPageCounter).to receive(:totals).and_raise(::Redis::CommandError)
expect(described_class.redis_usage_data(::Gitlab::UsageDataCounters::WikiPageCounter)).to eql(::Gitlab::UsageDataCounters::WikiPageCounter.fallback_totals)
end
it 'returns the totals when couter is given' do
allow(::Gitlab::UsageDataCounters::WikiPageCounter).to receive(:totals).and_return({ wiki_pages_create: 2 })
expect(described_class.redis_usage_data(::Gitlab::UsageDataCounters::WikiPageCounter)).to eql({ wiki_pages_create: 2 })
end
end
end
describe '#with_prometheus_client' do
shared_examples 'query data from Prometheus' do
it 'yields a client instance and returns the block result' do
result = described_class.with_prometheus_client { |client| client }
expect(result).to be_an_instance_of(Gitlab::PrometheusClient)
end
end
shared_examples 'does not query data from Prometheus' do
it 'returns nil by default' do
result = described_class.with_prometheus_client { |client| client }
expect(result).to be_nil
end
it 'returns fallback if provided' do
result = described_class.with_prometheus_client(fallback: []) { |client| client }
expect(result).to eq([])
end
end
shared_examples 'try to query Prometheus with given address' do
context 'Prometheus is ready' do
before do
stub_request(:get, /\/-\/ready/)
.to_return(status: 200, body: 'Prometheus is Ready.\n')
end
context 'Prometheus is reachable through HTTPS' do
it_behaves_like 'query data from Prometheus'
end
context 'Prometheus is not reachable through HTTPS' do
before do
stub_request(:get, /https:\/\/.*/).to_raise(Errno::ECONNREFUSED)
end
context 'Prometheus is reachable through HTTP' do
it_behaves_like 'query data from Prometheus'
end
context 'Prometheus is not reachable through HTTP' do
before do
stub_request(:get, /http:\/\/.*/).to_raise(Errno::ECONNREFUSED)
end
it_behaves_like 'does not query data from Prometheus'
end
end
end
context 'Prometheus is not ready' do
before do
stub_request(:get, /\/-\/ready/)
.to_return(status: 503, body: 'Service Unavailable')
end
it_behaves_like 'does not query data from Prometheus'
end
end
context 'when Prometheus server address is available from settings' do
before do
expect(Gitlab::Prometheus::Internal).to receive(:prometheus_enabled?).and_return(true)
expect(Gitlab::Prometheus::Internal).to receive(:uri).and_return('http://prom:9090')
end
it_behaves_like 'try to query Prometheus with given address'
end
context 'when Prometheus server address is available from Consul service discovery' do
before do
expect(Gitlab::Prometheus::Internal).to receive(:prometheus_enabled?).and_return(false)
expect(Gitlab::Consul::Internal).to receive(:api_url).and_return('http://localhost:8500')
expect(Gitlab::Consul::Internal).to receive(:discover_prometheus_server_address).and_return('prom:9090')
end
it_behaves_like 'try to query Prometheus with given address'
end
context 'when Prometheus server address is not available' do
before do
expect(Gitlab::Prometheus::Internal).to receive(:prometheus_enabled?).and_return(false)
expect(Gitlab::Consul::Internal).to receive(:api_url).and_return(nil)
end
it_behaves_like 'does not query data from Prometheus'
end
end
describe '#measure_duration' do
it 'returns block result and execution duration' do
allow(Process).to receive(:clock_gettime).and_return(1, 3)
result, duration = described_class.measure_duration { 42 }
expect(result).to eq(42)
expect(duration).to eq(2)
end
end
describe '#with_finished_at' do
it 'adds a timestamp to the hash yielded by the block' do
freeze_time do
result = described_class.with_finished_at(:current_time) { { a: 1 } }
expect(result).to eq(a: 1, current_time: Time.current)
end
end
end
describe '#track_usage_event' do
let(:value) { '9f302fea-f828-4ca9-aef4-e10bd723c0b3' }
let(:event_name) { 'incident_management_alert_status_changed' }
let(:unknown_event) { 'unknown' }
let(:feature) { "usage_data_#{event_name}" }
before do
skip_feature_flags_yaml_validation
end
context 'with feature enabled' do
before do
stub_feature_flags(feature => true)
end
it 'tracks redis hll event' do
expect(Gitlab::UsageDataCounters::HLLRedisCounter).to receive(:track_event).with(event_name, values: value)
described_class.track_usage_event(event_name, value)
end
it 'raise an error for unknown event' do
expect { described_class.track_usage_event(unknown_event, value) }.to raise_error(Gitlab::UsageDataCounters::HLLRedisCounter::UnknownEvent)
end
end
context 'with feature disabled' do
before do
stub_feature_flags(feature => false)
end
it 'does not track event' do
expect(Gitlab::UsageDataCounters::HLLRedisCounter).not_to receive(:track_event)
described_class.track_usage_event(event_name, value)
end
end
end
end
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