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require 'spec_helper'
describe Gitlab::Metrics::Subscribers::RailsCache do
let(:env) { {} }
let(:transaction) { Gitlab::Metrics::WebTransaction.new(env) }
let(:subscriber) { described_class.new }
let(:event) { double(:event, duration: 15.2) }
describe '#cache_read' do
it 'increments the cache_read duration' do
expect(subscriber).to receive(:observe)
.with(:read, event.duration)
subscriber.cache_read(event)
end
context 'with a transaction' do
before do
allow(subscriber).to receive(:current_transaction)
.and_return(transaction)
end
context 'with hit event' do
let(:event) { double(:event, duration: 15.2, payload: { hit: true }) }
it 'increments the cache_read_hit count' do
expect(transaction).to receive(:increment)
.with(:cache_read_hit_count, 1, false)
expect(transaction).to receive(:increment)
.with(any_args).at_least(1) # Other calls
subscriber.cache_read(event)
end
context 'when super operation is fetch' do
let(:event) { double(:event, duration: 15.2, payload: { hit: true, super_operation: :fetch }) }
it 'does not increment cache read miss' do
expect(transaction).not_to receive(:increment)
.with(:cache_read_hit_count, 1)
subscriber.cache_read(event)
end
end
end
context 'with miss event' do
let(:event) { double(:event, duration: 15.2, payload: { hit: false }) }
it 'increments the cache_read_miss count' do
expect(transaction).to receive(:increment)
.with(:cache_read_miss_count, 1, false)
expect(transaction).to receive(:increment)
.with(any_args).at_least(1) # Other calls
subscriber.cache_read(event)
end
it 'increments the cache_read_miss total' do
expect(subscriber.send(:metric_cache_misses_total)).to receive(:increment).with({})
subscriber.cache_read(event)
end
context 'when super operation is fetch' do
let(:event) { double(:event, duration: 15.2, payload: { hit: false, super_operation: :fetch }) }
it 'does not increment cache read miss' do
expect(transaction).not_to receive(:increment)
.with(:cache_read_miss_count, 1)
subscriber.cache_read(event)
end
it 'does not increment cache_read_miss total' do
expect(subscriber.send(:metric_cache_misses_total)).not_to receive(:increment).with({})
subscriber.cache_read(event)
end
end
end
end
end
describe '#cache_write' do
it 'observes write duration' do
expect(subscriber).to receive(:observe)
.with(:write, event.duration)
subscriber.cache_write(event)
end
end
describe '#cache_delete' do
it 'observes delete duration' do
expect(subscriber).to receive(:observe)
.with(:delete, event.duration)
subscriber.cache_delete(event)
end
end
describe '#cache_exist?' do
it 'observes the exists duration' do
expect(subscriber).to receive(:observe)
.with(:exists, event.duration)
subscriber.cache_exist?(event)
end
end
describe '#cache_fetch_hit' do
context 'without a transaction' do
it 'returns' do
expect(transaction).not_to receive(:increment)
subscriber.cache_fetch_hit(event)
end
end
context 'with a transaction' do
before do
allow(subscriber).to receive(:current_transaction)
.and_return(transaction)
end
it 'increments the cache_read_hit count' do
expect(transaction).to receive(:increment)
.with(:cache_read_hit_count, 1)
subscriber.cache_fetch_hit(event)
end
end
end
describe '#cache_generate' do
context 'without a transaction' do
it 'returns' do
expect(transaction).not_to receive(:increment)
subscriber.cache_generate(event)
end
end
context 'with a transaction' do
let(:metric_cache_misses_total) { double('metric_cache_misses_total', increment: nil) }
before do
allow(subscriber).to receive(:metric_cache_misses_total).and_return(metric_cache_misses_total)
allow(subscriber).to receive(:current_transaction)
.and_return(transaction)
end
it 'increments the cache_fetch_miss count' do
expect(transaction).to receive(:increment)
.with(:cache_read_miss_count, 1)
subscriber.cache_generate(event)
end
it 'increments the cache_read_miss total' do
subscriber.cache_generate(event)
expect(metric_cache_misses_total).to have_received(:increment).with({})
end
end
end
describe '#observe' do
context 'without a transaction' do
it 'returns' do
expect(transaction).not_to receive(:increment)
subscriber.observe(:foo, 15.2)
end
end
context 'with a transaction' do
before do
allow(subscriber).to receive(:current_transaction)
.and_return(transaction)
end
it 'increments the total and specific cache duration' do
expect(transaction).to receive(:increment)
.with(:cache_duration, event.duration, false)
expect(transaction).to receive(:increment)
.with(:cache_count, 1, false)
expect(transaction).to receive(:increment)
.with(:cache_delete_duration, event.duration, false)
expect(transaction).to receive(:increment)
.with(:cache_delete_count, 1, false)
subscriber.observe(:delete, event.duration)
end
it 'observes cache metric' do
expect(subscriber.send(:metric_cache_operation_duration_seconds))
.to receive(:observe)
.with(transaction.labels.merge(operation: :delete), event.duration / 1000.0)
subscriber.observe(:delete, event.duration)
end
end
end
end
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