feat(dossiers): lock submit en construction to avoid merge collisions with double submits

spec/controllers/concerns/lockable_concern_spec.rb

@@ -0,0 +1,46 @@
+describe LockableConcern, type: :controller do
+  controller(ApplicationController) do
+    include LockableConcern
+
+    def test_action
+      lock_action(params.fetch(:lock_key)) do
+        render plain: 'Action completed'
+      end
+    end
+  end
+
+  before do
+    routes.draw { get 'test_action/:lock_key' => 'anonymous#test_action' }
+  end
+
+  describe '#lock_action' do
+    # randomize key to avoid collision on concurrent tests
+    let(:lock_key) { "test_lock_#{SecureRandom.uuid}" }
+    subject { get :test_action, params: { lock_key: } }
+
+    context 'when there is no concurrent request' do
+      it 'completes the action' do
+        expect(subject).to have_http_status(:ok)
+      end
+    end
+
+    context 'when there are concurrent requests' do
+      it 'aborts the second request' do
+        # Simulating the first request acquiring the lock
+        Kredis.flag(lock_key, config: :volatile).mark(expires_in: 3.seconds)
+
+        # Making the second request
+        expect(subject).to have_http_status(:locked)
+      end
+    end
+
+    context 'when the lock expires' do
+      it 'allows another request after expiration' do
+        Kredis.flag(lock_key, config: :volatile).mark(expires_in: 0.001.seconds)
+        sleep 0.002
+
+        expect(subject).to have_http_status(:ok)
+      end
+    end
+  end
+end