1 files changed, 88 insertions, 0 deletions
diff --git a/spec/lib/gitlab/sidekiq_middleware/shutdown_spec.rb b/spec/lib/gitlab/sidekiq_middleware/shutdown_spec.rb
new file mode 100644
index 00000000000..0001795c3f0
--- /dev/null
+++ b/spec/lib/gitlab/sidekiq_middleware/shutdown_spec.rb
@@ -0,0 +1,88 @@
+require 'spec_helper'
+
+describe Gitlab::SidekiqMiddleware::Shutdown do
+  subject { described_class.new }
+
+  let(:pid) { Process.pid }
+  let(:worker) { double(:worker, class: 'TestWorker') }
+  let(:job) { { 'jid' => 123 } }
+  let(:queue) { 'test_queue' }
+  let(:block) { proc { nil } }
+
+  def run
+    subject.call(worker, job, queue) { block.call }
+    described_class.shutdown_thread&.join
+  end
+
+  def pop_trace
+    subject.trace.pop(true)
+  end
+
+  before do
+    allow(subject).to receive(:get_rss).and_return(10.kilobytes)
+    described_class.clear_shutdown_thread
+  end
+
+  context 'when MAX_RSS is set to 0' do
+    before do
+      stub_const("#{described_class}::MAX_RSS", 0)
+    end
+
+    it 'does nothing' do
+      expect(subject).not_to receive(:sleep)
+
+      run
+    end
+  end
+
+  def expect_shutdown_sequence
+    expect(pop_trace).to eq([:sleep, 15 * 60])
+    expect(pop_trace).to eq([:kill, 'SIGTSTP', pid])
+
+    expect(pop_trace).to eq([:sleep, 30])
+    expect(pop_trace).to eq([:kill, 'SIGTERM', pid])
+
+    expect(pop_trace).to eq([:sleep, 10])
+    expect(pop_trace).to eq([:kill, 'SIGKILL', pid])
+  end
+
+  context 'when MAX_RSS is exceeded' do
+    before do
+      stub_const("#{described_class}::MAX_RSS", 5.kilobytes)
+    end
+
+    it 'sends the TSTP, TERM and KILL signals at expected times' do
+      run
+
+      expect_shutdown_sequence
+    end
+  end
+
+  context 'when MAX_RSS is not exceeded' do
+    before do
+      stub_const("#{described_class}::MAX_RSS", 15.kilobytes)
+    end
+
+    it 'does nothing' do
+      expect(subject).not_to receive(:sleep)
+
+      run
+    end
+  end
+
+  context 'when WantShutdown is raised' do
+    let(:block) { proc { raise described_class::WantShutdown } }
+
+    it 'starts the shutdown sequence and re-raises the exception' do
+      expect { run }.to raise_exception(described_class::WantShutdown)
+
+      # We can't expect 'run' to have joined on the shutdown thread, because
+      # it hit an exception.
+      shutdown_thread = described_class.shutdown_thread
+      expect(shutdown_thread).not_to be_nil
+      shutdown_thread.join
+
+      expect_shutdown_sequence
+    end
+  end
+end