gitlab-org--gitlab-foss/spec/models/concerns/cacheable_attributes_spec.rb
2018-11-01 08:59:20 +02:00

230 lines
6.7 KiB
Ruby

require 'spec_helper'
describe CacheableAttributes do
let(:minimal_test_class) do
Class.new do
include ActiveModel::Model
extend ActiveModel::Callbacks
define_model_callbacks :commit
include CacheableAttributes
def self.name
'TestClass'
end
def self.first
@_first ||= new('foo' => 'a')
end
def self.last
@_last ||= new('foo' => 'a', 'bar' => 'b')
end
attr_accessor :attributes
def initialize(attrs = {}, *)
@attributes = attrs
end
end
end
shared_context 'with defaults' do
before do
minimal_test_class.define_singleton_method(:defaults) do
{ foo: 'a', bar: 'b', baz: 'c' }
end
end
end
describe '.current_without_cache' do
it 'defaults to last' do
expect(minimal_test_class.current_without_cache).to eq(minimal_test_class.last)
end
it 'can be overridden' do
minimal_test_class.define_singleton_method(:current_without_cache) do
first
end
expect(minimal_test_class.current_without_cache).to eq(minimal_test_class.first)
end
end
describe '.cache_key' do
it 'excludes cache attributes' do
expect(minimal_test_class.cache_key).to eq("TestClass:#{Gitlab::VERSION}:#{Rails.version}")
end
end
describe '.defaults' do
it 'defaults to {}' do
expect(minimal_test_class.defaults).to eq({})
end
context 'with defaults defined' do
include_context 'with defaults'
it 'can be overridden' do
expect(minimal_test_class.defaults).to eq({ foo: 'a', bar: 'b', baz: 'c' })
end
end
end
describe '.build_from_defaults' do
include_context 'with defaults'
context 'without any attributes given' do
it 'intializes a new object with the defaults' do
expect(minimal_test_class.build_from_defaults.attributes).to eq(minimal_test_class.defaults)
end
end
context 'with attributes given' do
it 'intializes a new object with the given attributes merged into the defaults' do
expect(minimal_test_class.build_from_defaults(foo: 'd').attributes[:foo]).to eq('d')
end
end
describe 'edge cases on concrete implementations' do
describe '.build_from_defaults' do
context 'without any attributes given' do
it 'intializes all attributes even if they are nil' do
record = ApplicationSetting.build_from_defaults
expect(record).not_to be_persisted
expect(record.sign_in_text).to be_nil
end
end
end
end
end
describe '.current', :use_clean_rails_memory_store_caching do
context 'redis unavailable' do
before do
allow(minimal_test_class).to receive(:last).and_return(:last)
expect(Rails.cache).to receive(:read).with(minimal_test_class.cache_key).and_raise(Redis::BaseError)
end
context 'in production environment' do
before do
expect(Rails.env).to receive(:production?).and_return(true)
end
it 'returns an uncached record and logs a warning' do
expect(Rails.logger).to receive(:warn).with("Cached record for TestClass couldn't be loaded, falling back to uncached record: Redis::BaseError")
expect(minimal_test_class.current).to eq(:last)
end
end
context 'in other environments' do
before do
expect(Rails.env).to receive(:production?).and_return(false)
end
it 'returns an uncached record and logs a warning' do
expect(Rails.logger).not_to receive(:warn)
expect { minimal_test_class.current }.to raise_error(Redis::BaseError)
end
end
end
context 'when a record is not yet present' do
it 'does not cache nil object' do
# when missing settings a nil object is returned, but not cached
allow(ApplicationSetting).to receive(:current_without_cache).twice.and_return(nil)
expect(ApplicationSetting.current).to be_nil
expect(Rails.cache.exist?(ApplicationSetting.cache_key)).to be(false)
end
it 'caches non-nil object' do
create(:application_setting)
expect(ApplicationSetting.current).to eq(ApplicationSetting.last)
expect(Rails.cache.exist?(ApplicationSetting.cache_key)).to be(true)
# subsequent calls retrieve the record from the cache
last_record = ApplicationSetting.last
expect(ApplicationSetting).not_to receive(:current_without_cache)
expect(ApplicationSetting.current.attributes).to eq(last_record.attributes)
end
end
describe 'edge cases' do
describe 'caching behavior', :use_clean_rails_memory_store_caching do
it 'retrieves upload fields properly' do
ar_record = create(:appearance, :with_logo)
ar_record.cache!
cache_record = Appearance.current
expect(cache_record).to be_persisted
expect(cache_record.logo).to be_an(AttachmentUploader)
expect(cache_record.logo.url).to end_with('/dk.png')
end
it 'retrieves markdown fields properly' do
ar_record = create(:appearance, description: '**Hello**')
ar_record.cache!
cache_record = Appearance.current
expect(cache_record.description).to eq('**Hello**')
expect(cache_record.description_html).to eq('<p dir="auto"><strong>Hello</strong></p>')
end
end
end
it 'uses RequestStore in addition to Rails.cache', :request_store do
# Warm up the cache
create(:application_setting).cache!
expect(Rails.cache).to receive(:read).with(ApplicationSetting.cache_key).once.and_call_original
2.times { ApplicationSetting.current }
end
end
describe '.cached', :use_clean_rails_memory_store_caching do
context 'when cache is cold' do
it 'returns nil' do
expect(minimal_test_class.cached).to be_nil
end
end
context 'when cached is warm' do
before do
# Warm up the cache
create(:appearance).cache!
end
it 'retrieves the record from cache' do
expect(ActiveRecord::QueryRecorder.new { Appearance.cached }.count).to eq(0)
expect(Appearance.cached).to eq(Appearance.current_without_cache)
end
end
end
describe '#cache!', :use_clean_rails_memory_store_caching do
let(:record) { create(:appearance) }
it 'caches the attributes' do
record.cache!
expect(Rails.cache.read(Appearance.cache_key)).to eq(record)
end
describe 'edge cases' do
let(:record) { create(:appearance) }
it 'caches the attributes' do
record.cache!
expect(Rails.cache.read(Appearance.cache_key)).to eq(record)
end
end
end
end