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# frozen_string_literal: true
require 'fast_spec_helper'
RSpec.describe 'memory watchdog' do
subject(:run_initializer) do
load Rails.root.join('config/initializers/memory_watchdog.rb')
end
context 'when GITLAB_MEMORY_WATCHDOG_ENABLED is truthy' do
let(:env_switch) { 'true' }
before do
stub_env('GITLAB_MEMORY_WATCHDOG_ENABLED', env_switch)
end
context 'when runtime is an application' do
let(:watchdog) { instance_double(Gitlab::Memory::Watchdog) }
let(:background_task) { instance_double(Gitlab::BackgroundTask) }
before do
allow(Gitlab::Runtime).to receive(:application?).and_return(true)
end
it 'registers a life-cycle hook' do
expect(Gitlab::Cluster::LifecycleEvents).to receive(:on_worker_start)
run_initializer
end
shared_examples 'starts watchdog with handler' do |handler_class|
it "uses the #{handler_class} and starts the watchdog" do
expect(Gitlab::Memory::Watchdog).to receive(:new).with(
handler: an_instance_of(handler_class),
logger: Gitlab::AppLogger).and_return(watchdog)
expect(Gitlab::BackgroundTask).to receive(:new).with(watchdog).and_return(background_task)
expect(background_task).to receive(:start)
expect(Gitlab::Cluster::LifecycleEvents).to receive(:on_worker_start).and_yield
run_initializer
end
end
# In tests, the Puma constant does not exist so we cannot use a verified double.
# rubocop: disable RSpec/VerifiedDoubles
context 'when puma' do
let(:puma) do
Class.new do
def self.cli_config
Struct.new(:options).new
end
end
end
before do
stub_const('Puma', puma)
stub_const('Puma::Cluster::WorkerHandle', double.as_null_object)
allow(Gitlab::Runtime).to receive(:puma?).and_return(true)
end
it_behaves_like 'starts watchdog with handler', Gitlab::Memory::Watchdog::PumaHandler
end
# rubocop: enable RSpec/VerifiedDoubles
context 'when sidekiq' do
before do
allow(Gitlab::Runtime).to receive(:sidekiq?).and_return(true)
end
it_behaves_like 'starts watchdog with handler', Gitlab::Memory::Watchdog::TermProcessHandler
end
context 'when other runtime' do
it_behaves_like 'starts watchdog with handler', Gitlab::Memory::Watchdog::NullHandler
end
end
context 'when runtime is unsupported' do
it 'does not register life-cycle hook' do
expect(Gitlab::Cluster::LifecycleEvents).not_to receive(:on_worker_start)
run_initializer
end
end
end
context 'when GITLAB_MEMORY_WATCHDOG_ENABLED is false' do
let(:env_switch) { 'false' }
before do
stub_env('GITLAB_MEMORY_WATCHDOG_ENABLED', env_switch)
# To rule out we return early due to this being false.
allow(Gitlab::Runtime).to receive(:application?).and_return(true)
end
it 'does not register life-cycle hook' do
expect(Gitlab::Cluster::LifecycleEvents).not_to receive(:on_worker_start)
run_initializer
end
end
context 'when GITLAB_MEMORY_WATCHDOG_ENABLED is not set' do
before do
# To rule out we return early due to this being false.
allow(Gitlab::Runtime).to receive(:application?).and_return(true)
end
it 'does not register life-cycle hook' do
expect(Gitlab::Cluster::LifecycleEvents).not_to receive(:on_worker_start)
run_initializer
end
end
end
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