375 lines
10 KiB
Ruby
375 lines
10 KiB
Ruby
# frozen_string_literal: true
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require 'spec_helper'
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RSpec.describe ReactiveCaching, :use_clean_rails_memory_store_caching do
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include ExclusiveLeaseHelpers
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include ReactiveCachingHelpers
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let(:cache_class_test) do
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Class.new do
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include ReactiveCaching
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self.reactive_cache_key = ->(thing) { ["foo", thing.id] }
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self.reactive_cache_lifetime = 5.minutes
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self.reactive_cache_refresh_interval = 15.seconds
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attr_reader :id
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def self.primary_key
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:id
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end
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def initialize(id, &blk)
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@id = id
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@calculator = blk
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end
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def calculate_reactive_cache
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@calculator.call
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end
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def result
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with_reactive_cache do |data|
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data
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end
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end
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end
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end
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let(:external_dependency_cache_class_test) do
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Class.new(cache_class_test) do
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self.reactive_cache_work_type = :external_dependency
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end
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end
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let(:calculation) { -> { 2 + 2 } }
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let(:cache_key) { "foo:666" }
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let(:instance) { cache_class_test.new(666, &calculation) }
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describe '#with_reactive_cache' do
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before do
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stub_reactive_cache
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end
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subject(:go!) { instance.result }
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shared_examples 'reactive worker call' do |worker_class|
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let(:instance) do
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test_class.new(666, &calculation)
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end
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it 'performs caching with correct worker' do
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expect(worker_class).to receive(:perform_async).with(test_class, 666)
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go!
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end
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end
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shared_examples 'a cacheable value' do |cached_value|
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before do
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stub_reactive_cache(instance, cached_value)
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end
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it { is_expected.to eq(cached_value) }
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it 'does not enqueue a background worker' do
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expect(ReactiveCachingWorker).not_to receive(:perform_async)
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go!
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end
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it 'updates the cache lifespan' do
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expect(Rails.cache).to receive(:write).with(alive_reactive_cache_key(instance), true, expires_in: anything)
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go!
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end
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context 'and expired' do
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before do
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invalidate_reactive_cache(instance)
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end
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it { is_expected.to be_nil }
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it_behaves_like 'reactive worker call', ReactiveCachingWorker do
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let(:test_class) { cache_class_test }
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end
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it_behaves_like 'reactive worker call', ExternalServiceReactiveCachingWorker do
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let(:test_class) { external_dependency_cache_class_test }
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end
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end
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end
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context 'when cache is empty' do
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it { is_expected.to be_nil }
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it_behaves_like 'reactive worker call', ReactiveCachingWorker do
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let(:test_class) { cache_class_test }
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end
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it_behaves_like 'reactive worker call', ExternalServiceReactiveCachingWorker do
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let(:test_class) { external_dependency_cache_class_test }
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end
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it 'updates the cache lifespan' do
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expect(reactive_cache_alive?(instance)).to be_falsy
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go!
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expect(reactive_cache_alive?(instance)).to be_truthy
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end
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end
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context 'when the cache is full' do
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it_behaves_like 'a cacheable value', 4
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end
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context 'when the cache contains non-nil but blank value' do
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it_behaves_like 'a cacheable value', false
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end
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context 'when the cache contains nil value' do
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it_behaves_like 'a cacheable value', nil
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end
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end
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describe '#with_reactive_cache_set', :use_clean_rails_redis_caching do
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subject(:go!) do
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instance.with_reactive_cache_set('resource', {}) do |data|
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data
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end
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end
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it 'calls with_reactive_cache' do
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expect(instance)
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.to receive(:with_reactive_cache)
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go!
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end
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context 'data returned' do
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let(:resource) { 'resource' }
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let(:set_key) { "#{cache_key}:#{resource}" }
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let(:set_cache) { Gitlab::ReactiveCacheSetCache.new }
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before do
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stub_reactive_cache(instance, true, resource, {})
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end
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it 'saves keys in set' do
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expect(set_cache.read(set_key)).to be_empty
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go!
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expect(set_cache.read(set_key)).not_to be_empty
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end
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it 'returns the data' do
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expect(go!).to eq(true)
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end
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end
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end
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describe '.reactive_cache_worker_finder' do
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context 'with default reactive_cache_worker_finder' do
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let(:args) { %w(other args) }
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before do
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allow(instance.class).to receive(:find_by).with(id: instance.id)
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.and_return(instance)
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end
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it 'calls the activerecord find_by method' do
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result = instance.class.reactive_cache_worker_finder.call(instance.id, *args)
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expect(result).to eq(instance)
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expect(instance.class).to have_received(:find_by).with(id: instance.id)
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end
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end
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context 'with custom reactive_cache_worker_finder' do
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let(:args) { %w(arg1 arg2) }
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let(:instance) { custom_finder_cache_test.new(666, &calculation) }
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let(:custom_finder_cache_test) do
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Class.new(cache_class_test) do
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self.reactive_cache_worker_finder = ->(_id, *args) { from_cache(*args) }
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def self.from_cache(*args); end
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end
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end
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before do
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allow(instance.class).to receive(:from_cache).with(*args).and_return(instance)
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end
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it 'overrides the default reactive_cache_worker_finder' do
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result = instance.class.reactive_cache_worker_finder.call(instance.id, *args)
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expect(result).to eq(instance)
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expect(instance.class).to have_received(:from_cache).with(*args)
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end
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end
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end
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describe '#clear_reactive_cache!' do
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before do
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stub_reactive_cache(instance, 4)
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instance.clear_reactive_cache!
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end
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it { expect(instance.result).to be_nil }
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it { expect(reactive_cache_alive?(instance)).to be_falsy }
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end
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describe '#exclusively_update_reactive_cache!' do
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subject(:go!) { instance.exclusively_update_reactive_cache! }
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shared_examples 'successful cache' do
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it 'caches the result of #calculate_reactive_cache' do
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go!
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expect(read_reactive_cache(instance)).to eq(calculation.call)
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end
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it 'does not raise the exception' do
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expect { go! }.not_to raise_exception(ReactiveCaching::ExceededReactiveCacheLimit)
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end
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end
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context 'when the lease is free and lifetime is not exceeded' do
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before do
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stub_reactive_cache(instance, 'preexisting')
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end
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it_behaves_like 'successful cache'
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it 'takes and releases the lease' do
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expect_to_obtain_exclusive_lease(cache_key, 'uuid')
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expect_to_cancel_exclusive_lease(cache_key, 'uuid')
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go!
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end
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it 'enqueues a repeat worker' do
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expect_reactive_cache_update_queued(instance)
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go!
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end
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context 'when :external_dependency cache' do
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let(:instance) do
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external_dependency_cache_class_test.new(666, &calculation)
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end
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it 'enqueues a repeat worker' do
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expect_reactive_cache_update_queued(instance, worker_klass: ExternalServiceReactiveCachingWorker)
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go!
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end
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end
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it 'calls a reactive_cache_updated only once if content did not change on subsequent update' do
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expect(instance).to receive(:calculate_reactive_cache).twice
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expect(instance).to receive(:reactive_cache_updated).once
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2.times { instance.exclusively_update_reactive_cache! }
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end
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it 'does not delete the value key' do
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expect(Rails.cache).to receive(:delete).with(cache_key).never
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go!
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end
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context 'when reactive_cache_hard_limit is set' do
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let(:test_class) { Class.new(cache_class_test) { self.reactive_cache_hard_limit = 1.megabyte } }
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let(:instance) { test_class.new(666, &calculation) }
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context 'when cache size is over the overridden limit' do
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let(:calculation) { -> { 'a' * 2 * 1.megabyte } }
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it 'raises ExceededReactiveCacheLimit exception and does not cache new data' do
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expect { go! }.to raise_exception(ReactiveCaching::ExceededReactiveCacheLimit)
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expect(read_reactive_cache(instance)).not_to eq(calculation.call)
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end
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context 'when reactive_cache_limit_enabled? is overridden to return false' do
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before do
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allow(instance).to receive(:reactive_cache_limit_enabled?).and_return(false)
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end
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it_behaves_like 'successful cache'
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end
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end
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context 'when cache size is within the overridden limit' do
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let(:calculation) { -> { 'Smaller than 1Mb reactive_cache_hard_limit' } }
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it_behaves_like 'successful cache'
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end
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end
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context 'and #calculate_reactive_cache raises an exception' do
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before do
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stub_reactive_cache(instance, "preexisting")
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end
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let(:calculation) { -> { raise "foo"} }
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it 'leaves the cache untouched' do
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expect { go! }.to raise_error("foo")
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expect(read_reactive_cache(instance)).to eq("preexisting")
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end
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it 'does not enqueue a repeat worker' do
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expect(ReactiveCachingWorker)
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.not_to receive(:perform_in)
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expect { go! }.to raise_error("foo")
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end
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end
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end
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context 'when lifetime is exceeded' do
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it 'skips the calculation' do
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expect(instance).to receive(:calculate_reactive_cache).never
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go!
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end
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it 'deletes the value key' do
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expect(Rails.cache).to receive(:delete).with(cache_key).once
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go!
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end
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end
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context 'when the lease is already taken' do
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it 'skips the calculation' do
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stub_exclusive_lease_taken(cache_key)
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expect(instance).to receive(:calculate_reactive_cache).never
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go!
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end
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end
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end
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describe 'default options' do
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let(:cached_class) { Class.new { include ReactiveCaching } }
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subject { cached_class.new }
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it { expect(subject.reactive_cache_lease_timeout).to be_a(ActiveSupport::Duration) }
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it { expect(subject.reactive_cache_refresh_interval).to be_a(ActiveSupport::Duration) }
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it { expect(subject.reactive_cache_lifetime).to be_a(ActiveSupport::Duration) }
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it { expect(subject.reactive_cache_key).to respond_to(:call) }
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it { expect(subject.reactive_cache_hard_limit).to be_nil }
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it { expect(subject.reactive_cache_worker_finder).to respond_to(:call) }
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end
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end
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