Expose services in the web ide terminal entity

ee/app/models/web_ide_terminal.rb

@@ -32,6 +32,10 @@ class WebIdeTerminal
     proxy_project_job_path(project, build, format: :ws)
   end
 
+  def services
+    build.services.map(&:alias).compact + Array(build.image&.alias)
+  end
+
   private
 
   def web_ide_terminal_route_generator(action, options = {})

ee/app/serializers/web_ide_terminal_entity.rb

@@ -7,5 +7,6 @@ class WebIdeTerminalEntity < Grape::Entity
   expose :cancel_path
   expose :retry_path
   expose :terminal_path
+  expose :services
   expose :proxy_websocket_path, if: ->(_) { Feature.enabled?(:build_service_proxy) }
 end

ee/changelogs/unreleased/fj-11845-expose-web-ide-terminal-services.yml

+---
+title: Expose services in the web ide terminal entity
+merge_request: 13665
+author:
+type: other

ee/spec/models/web_ide_terminal_spec.rb

@@ -26,4 +26,57 @@ describe WebIdeTerminal do
   it 'returns the proxy_websocket_path of the build' do
     expect(subject.proxy_websocket_path).to end_with("/jobs/#{build.id}/proxy.ws")
   end
+
+  describe 'services' do
+    let(:services_with_aliases) do
+      {
+        services: [{ name: 'postgres', alias: 'postgres' },
+                   { name: 'docker:stable-dind', alias: 'docker' }]
+      }
+    end
+
+    before do
+      allow(build).to receive(:options).and_return(config)
+    end
+
+    context 'when image does not have an alias' do
+      let(:config) do
+        { image: 'ruby:2.1' }.merge(services_with_aliases)
+      end
+
+      it 'returns services aliases' do
+        expect(subject.services).to eq %w(postgres docker)
+      end
+    end
+
+    context 'when both image and services have aliases' do
+      let(:config) do
+        { image: { name: 'ruby:2.1', alias: 'ruby' } }.merge(services_with_aliases)
+      end
+
+      it 'returns all aliases' do
+        expect(subject.services).to eq %w(postgres docker ruby)
+      end
+    end
+
+    context 'when image and services does not have any alias' do
+      let(:config) do
+        { image: 'ruby:2.1', services: ['postgres'] }
+      end
+
+      it 'returns an empty array' do
+        expect(subject.services).to be_empty
+      end
+    end
+
+    context 'when no image nor services' do
+      let(:config) do
+        { script: %w(echo) }
+      end
+
+      it 'returns an empty array' do
+        expect(subject.services).to be_empty
+      end
+    end
+  end
 end

ee/spec/serializers/web_ide_terminal_entity_spec.rb

@@ -14,6 +14,7 @@ describe WebIdeTerminalEntity do
   it { is_expected.to have_key(:cancel_path) }
   it { is_expected.to have_key(:retry_path) }
   it { is_expected.to have_key(:terminal_path) }
+  it { is_expected.to have_key(:services) }
 
   context 'when feature flag build_service_proxy is enabled' do
     before do