Adapt functions to work for external Knative

Remove Kn services cache from Clusters::Application::Knative

Knative function can exist even if user did not installed Knative via
GitLab managed apps.

-> Move responsibility of finding services into the Cluster
-> Responsability is inside Clusters::Cluster::KnativeServiceFinder
-> Projects::Serverless::FunctionsFinder now calls depends solely on a
cluster to find the Kn services.
-> Detect Knative by resource presence instead of service presence
-> Mock knative_installed response temporarily for frontend to develop

Display loader while `installed === 'checking'`

Added frontend work to determine if Knative is installed

Memoize with_reactive_cache(*args, &block) to avoid race conditions

When calling with_reactive_cache more than once, it's possible that the
second call will already have the value populated. Therefore, in cases
where we need the sequential calls to have consistent results, we'd fall
under a race condition.

Check knative installation via Knative resource presence

Only load pods if Knative is discovered

Always return a response in FunctionsController#index

- Always indicate if Knative is installed, not installed or checking
- Always indicate the partial response for functions. Final response is
guaranteed when knative_installed is either true | false.

Adds specs for Clusters::Cluster#knative_services_finder

Fix method name when calling on specs

Add an explicit check for functions

Added an explicit check to see if there are any functions available

Fix Serverless feature spec

- we don't find knative installation via database anymore,
rather via Knative resource

Display error message for request timeouts

Display an error message if the request times out

Adds feature specs for when functions exist

Remove a test purposed hardcoded flag

Add ability to partially load functions

Added the ability to partially load functions on the frontend

Add frontend unit tests

Added tests for the new frontend additions

Generate new translations

Generated new frontend translations

Address review comments

Cleaned up the frontend unit test.
Added computed prop for `isInstalled`.

Move string to constant

Simplify nil to array conversion

Put knative_installed states in a frozen hash for better read

Pluralize list of Knative states

Quey services and pods filtering name

This way we don't need to filter the namespace in memory.
Also, the data we get from the network is much smaller.

Simplify cache_key and fix bug

- Simplifies the cache_key by removing namespace duplicate
- Fixes a bug with reactive_cache memoization

12 files changed, 397 insertions, 205 deletions

diff --git a/spec/controllers/projects/serverless/functions_controller_spec.rb b/spec/controllers/projects/serverless/functions_controller_spec.rb
index 782f5f272d9..18c594acae0 100644
--- a/spec/controllers/projects/serverless/functions_controller_spec.rb
+++ b/spec/controllers/projects/serverless/functions_controller_spec.rb
@@ -8,9 +8,8 @@ describe Projects::Serverless::FunctionsController do
 
   let(:user) { create(:user) }
   let(:cluster) { create(:cluster, :project, :provided_by_gcp) }
-  let(:knative) { create(:clusters_applications_knative, :installed, cluster: cluster) }
   let(:service) { cluster.platform_kubernetes }
-  let(:project) { cluster.project}
+  let(:project) { cluster.project }
 
   let(:namespace) do
     create(:cluster_kubernetes_namespace,
@@ -30,17 +29,69 @@ describe Projects::Serverless::FunctionsController do
   end
 
   describe 'GET #index' do
-    context 'empty cache' do
-      it 'has no data' do
+    let(:expected_json) { { 'knative_installed' => knative_state, 'functions' => functions } }
+
+    context 'when cache is being read' do
+      let(:knative_state) { 'checking' }
+      let(:functions) { [] }
+
+      before do
         get :index, params: params({ format: :json })
+      end
 
-        expect(response).to have_gitlab_http_status(204)
+      it 'returns checking' do
+        expect(json_response).to eq expected_json
       end
 
-      it 'renders an html page' do
-        get :index, params: params
+      it { expect(response).to have_gitlab_http_status(200) }
+    end
+
+    context 'when cache is ready' do
+      let(:knative_services_finder) { project.clusters.first.knative_services_finder(project) }
+      let(:knative_state) { true }
 
-        expect(response).to have_gitlab_http_status(200)
+      before do
+        allow_any_instance_of(Clusters::Cluster)
+          .to receive(:knative_services_finder)
+          .and_return(knative_services_finder)
+        synchronous_reactive_cache(knative_services_finder)
+        stub_kubeclient_service_pods(
+          kube_response({ "kind" => "PodList", "items" => [] }),
+          namespace: namespace.namespace
+        )
+      end
+
+      context 'when no functions were found' do
+        let(:functions) { [] }
+
+        before do
+          stub_kubeclient_knative_services(
+            namespace: namespace.namespace,
+            response: kube_response({ "kind" => "ServiceList", "items" => [] })
+          )
+          get :index, params: params({ format: :json })
+        end
+
+        it 'returns checking' do
+          expect(json_response).to eq expected_json
+        end
+
+        it { expect(response).to have_gitlab_http_status(200) }
+      end
+
+      context 'when functions were found' do
+        let(:functions) { ["asdf"] }
+
+        before do
+          stub_kubeclient_knative_services(namespace: namespace.namespace)
+          get :index, params: params({ format: :json })
+        end
+
+        it 'returns functions' do
+          expect(json_response["functions"]).not_to be_empty
+        end
+
+        it { expect(response).to have_gitlab_http_status(200) }
       end
     end
   end
@@ -56,11 +107,12 @@ describe Projects::Serverless::FunctionsController do
     context 'valid data', :use_clean_rails_memory_store_caching do
       before do
         stub_kubeclient_service_pods
-        stub_reactive_cache(knative,
+        stub_reactive_cache(cluster.knative_services_finder(project),
           {
             services: kube_knative_services_body(namespace: namespace.namespace, name: cluster.project.name)["items"],
             pods: kube_knative_pods_body(cluster.project.name, namespace.namespace)["items"]
-          })
+          },
+          *cluster.knative_services_finder(project).cache_args)
       end
 
       it 'has a valid function name' do
@@ -88,11 +140,12 @@ describe Projects::Serverless::FunctionsController do
   describe 'GET #index with data', :use_clean_rails_memory_store_caching do
     before do
       stub_kubeclient_service_pods
-      stub_reactive_cache(knative,
+      stub_reactive_cache(cluster.knative_services_finder(project),
         {
           services: kube_knative_services_body(namespace: namespace.namespace, name: cluster.project.name)["items"],
           pods: kube_knative_pods_body(cluster.project.name, namespace.namespace)["items"]
-        })
+        },
+        *cluster.knative_services_finder(project).cache_args)
     end
 
     it 'has data' do
@@ -100,11 +153,16 @@ describe Projects::Serverless::FunctionsController do
 
       expect(response).to have_gitlab_http_status(200)
 
-      expect(json_response).to contain_exactly(
-        a_hash_including(
-          "name" => project.name,
-          "url" => "http://#{project.name}.#{namespace.namespace}.example.com"
-        )
+      expect(json_response).to match(
+        {
+          "knative_installed" => "checking",
+          "functions" => [
+            a_hash_including(
+              "name" => project.name,
+              "url" => "http://#{project.name}.#{namespace.namespace}.example.com"
+            )
+          ]
+        }
       )
     end
 
diff --git a/spec/features/projects/serverless/functions_spec.rb b/spec/features/projects/serverless/functions_spec.rb
index e14934b1672..9865dbbfb3c 100644
--- a/spec/features/projects/serverless/functions_spec.rb
+++ b/spec/features/projects/serverless/functions_spec.rb
@@ -4,6 +4,7 @@ require 'spec_helper'
 
 describe 'Functions', :js do
   include KubernetesHelpers
+  include ReactiveCachingHelpers
 
   let(:project) { create(:project) }
   let(:user) { create(:user) }
@@ -13,44 +14,70 @@ describe 'Functions', :js do
     gitlab_sign_in(user)
   end
 
-  context 'when user does not have a cluster and visits the serverless page' do
+  shared_examples "it's missing knative installation" do
     before do
       visit project_serverless_functions_path(project)
     end
 
-    it 'sees an empty state' do
+    it 'sees an empty state require Knative installation' do
       expect(page).to have_link('Install Knative')
       expect(page).to have_selector('.empty-state')
     end
   end
 
+  context 'when user does not have a cluster and visits the serverless page' do
+    it_behaves_like "it's missing knative installation"
+  end
+
   context 'when the user does have a cluster and visits the serverless page' do
     let(:cluster) { create(:cluster, :project, :provided_by_gcp) }
 
-    before do
-      visit project_serverless_functions_path(project)
-    end
-
-    it 'sees an empty state' do
-      expect(page).to have_link('Install Knative')
-      expect(page).to have_selector('.empty-state')
-    end
+    it_behaves_like "it's missing knative installation"
   end
 
   context 'when the user has a cluster and knative installed and visits the serverless page' do
     let(:cluster) { create(:cluster, :project, :provided_by_gcp) }
     let(:service) { cluster.platform_kubernetes }
-    let(:knative) { create(:clusters_applications_knative, :installed, cluster: cluster) }
-    let(:project) { knative.cluster.project }
+    let(:project) { cluster.project }
+    let(:knative_services_finder) { project.clusters.first.knative_services_finder(project) }
+    let(:namespace) do
+      create(:cluster_kubernetes_namespace,
+        cluster: cluster,
+        cluster_project: cluster.cluster_project,
+        project: cluster.cluster_project.project)
+    end
 
     before do
-      stub_kubeclient_knative_services
-      stub_kubeclient_service_pods
+      allow_any_instance_of(Clusters::Cluster)
+        .to receive(:knative_services_finder)
+        .and_return(knative_services_finder)
+      synchronous_reactive_cache(knative_services_finder)
+      stub_kubeclient_knative_services(stub_get_services_options)
+      stub_kubeclient_service_pods(nil, namespace: namespace.namespace)
       visit project_serverless_functions_path(project)
     end
 
-    it 'sees an empty listing of serverless functions' do
-      expect(page).to have_selector('.empty-state')
+    context 'when there are no functions' do
+      let(:stub_get_services_options) do
+        {
+          namespace: namespace.namespace,
+          response: kube_response({ "kind" => "ServiceList", "items" => [] })
+        }
+      end
+
+      it 'sees an empty listing of serverless functions' do
+        expect(page).to have_selector('.empty-state')
+        expect(page).not_to have_selector('.content-list')
+      end
+    end
+
+    context 'when there are functions' do
+      let(:stub_get_services_options) { { namespace: namespace.namespace } }
+
+      it 'does not see an empty listing of serverless functions' do
+        expect(page).not_to have_selector('.empty-state')
+        expect(page).to have_selector('.content-list')
+      end
     end
   end
 end
diff --git a/spec/finders/clusters/cluster/knative_services_finder_spec.rb b/spec/finders/clusters/cluster/knative_services_finder_spec.rb
new file mode 100644
index 00000000000..277200d06f4
--- /dev/null
+++ b/spec/finders/clusters/cluster/knative_services_finder_spec.rb
@@ -0,0 +1,105 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe Clusters::Cluster::KnativeServicesFinder do
+  include KubernetesHelpers
+  include ReactiveCachingHelpers
+
+  let(:cluster) { create(:cluster, :project, :provided_by_gcp) }
+  let(:service) { cluster.platform_kubernetes }
+  let(:project) { cluster.cluster_project.project }
+  let(:namespace) do
+    create(:cluster_kubernetes_namespace,
+      cluster: cluster,
+      cluster_project: cluster.cluster_project,
+      project: project)
+  end
+
+  before do
+    stub_kubeclient_knative_services(namespace: namespace.namespace)
+    stub_kubeclient_service_pods(
+      kube_response(
+        kube_knative_pods_body(
+          project.name, namespace.namespace
+        )
+      ),
+      namespace: namespace.namespace
+    )
+  end
+
+  shared_examples 'a cached data' do
+    it 'has an unintialized cache' do
+      is_expected.to be_blank
+    end
+
+    context 'when using synchronous reactive cache' do
+      before do
+        synchronous_reactive_cache(cluster.knative_services_finder(project))
+      end
+
+      context 'when there are functions for cluster namespace' do
+        it { is_expected.not_to be_blank }
+      end
+
+      context 'when there are no functions for cluster namespace' do
+        before do
+          stub_kubeclient_knative_services(
+            namespace: namespace.namespace,
+            response: kube_response({ "kind" => "ServiceList", "items" => [] })
+          )
+          stub_kubeclient_service_pods(
+            kube_response({ "kind" => "PodList", "items" => [] }),
+            namespace: namespace.namespace
+          )
+        end
+
+        it { is_expected.to be_blank }
+      end
+    end
+  end
+
+  describe '#service_pod_details' do
+    subject { cluster.knative_services_finder(project).service_pod_details(project.name) }
+
+    it_behaves_like 'a cached data'
+  end
+
+  describe '#services' do
+    subject { cluster.knative_services_finder(project).services }
+
+    it_behaves_like 'a cached data'
+  end
+
+  describe '#knative_detected' do
+    subject { cluster.knative_services_finder(project).knative_detected }
+    before do
+      synchronous_reactive_cache(cluster.knative_services_finder(project))
+    end
+
+    context 'when knative is installed' do
+      before do
+        stub_kubeclient_discover(service.api_url)
+      end
+
+      it { is_expected.to be_truthy }
+      it "discovers knative installation" do
+        expect { subject }
+          .to change { cluster.kubeclient.knative_client.discovered }
+          .from(false)
+          .to(true)
+      end
+    end
+
+    context 'when knative is not installed' do
+      before do
+        stub_kubeclient_discover_knative_not_found(service.api_url)
+      end
+
+      it { is_expected.to be_falsy }
+      it "does not discover knative installation" do
+        expect { subject }.not_to change { cluster.kubeclient.knative_client.discovered }
+      end
+    end
+  end
+end
diff --git a/spec/finders/projects/serverless/functions_finder_spec.rb b/spec/finders/projects/serverless/functions_finder_spec.rb
index 3ad38207da4..8aea45b457c 100644
--- a/spec/finders/projects/serverless/functions_finder_spec.rb
+++ b/spec/finders/projects/serverless/functions_finder_spec.rb
@@ -10,7 +10,7 @@ describe Projects::Serverless::FunctionsFinder do
   let(:user) { create(:user) }
   let(:cluster) { create(:cluster, :project, :provided_by_gcp) }
   let(:service) { cluster.platform_kubernetes }
-  let(:project) { cluster.project}
+  let(:project) { cluster.project }
 
   let(:namespace) do
     create(:cluster_kubernetes_namespace,
@@ -23,9 +23,45 @@ describe Projects::Serverless::FunctionsFinder do
     project.add_maintainer(user)
   end
 
+  describe '#installed' do
+    it 'when reactive_caching is still fetching data' do
+      expect(described_class.new(project).knative_installed).to eq 'checking'
+    end
+
+    context 'when reactive_caching has finished' do
+      let(:knative_services_finder) { project.clusters.first.knative_services_finder(project) }
+
+      before do
+        allow_any_instance_of(Clusters::Cluster)
+          .to receive(:knative_services_finder)
+          .and_return(knative_services_finder)
+        synchronous_reactive_cache(knative_services_finder)
+      end
+
+      context 'when knative is not installed' do
+        it 'returns false' do
+          stub_kubeclient_discover_knative_not_found(service.api_url)
+
+          expect(described_class.new(project).knative_installed).to eq false
+        end
+      end
+
+      context 'reactive_caching is finished and knative is installed' do
+        let(:knative_services_finder) { project.clusters.first.knative_services_finder(project) }
+
+        it 'returns true' do
+          stub_kubeclient_knative_services(namespace: namespace.namespace)
+          stub_kubeclient_service_pods(nil, namespace: namespace.namespace)
+
+          expect(described_class.new(project).knative_installed).to be true
+        end
+      end
+    end
+  end
+
   describe 'retrieve data from knative' do
-    it 'does not have knative installed' do
-      expect(described_class.new(project).execute).to be_empty
+    context 'does not have knative installed' do
+      it { expect(described_class.new(project).execute).to be_empty }
     end
 
     context 'has knative installed' do
@@ -38,22 +74,24 @@ describe Projects::Serverless::FunctionsFinder do
 
       it 'there are functions', :use_clean_rails_memory_store_caching do
         stub_kubeclient_service_pods
-        stub_reactive_cache(knative,
+        stub_reactive_cache(cluster.knative_services_finder(project),
           {
             services: kube_knative_services_body(namespace: namespace.namespace, name: cluster.project.name)["items"],
             pods: kube_knative_pods_body(cluster.project.name, namespace.namespace)["items"]
-          })
+          },
+          *cluster.knative_services_finder(project).cache_args)
 
         expect(finder.execute).not_to be_empty
       end
 
       it 'has a function', :use_clean_rails_memory_store_caching do
         stub_kubeclient_service_pods
-        stub_reactive_cache(knative,
+        stub_reactive_cache(cluster.knative_services_finder(project),
           {
             services: kube_knative_services_body(namespace: namespace.namespace, name: cluster.project.name)["items"],
             pods: kube_knative_pods_body(cluster.project.name, namespace.namespace)["items"]
-          })
+          },
+          *cluster.knative_services_finder(project).cache_args)
 
         result = finder.service(cluster.environment_scope, cluster.project.name)
         expect(result).not_to be_empty
@@ -84,20 +122,4 @@ describe Projects::Serverless::FunctionsFinder do
       end
     end
   end
-
-  describe 'verify if knative is installed' do
-    context 'knative is not installed' do
-      it 'does not have knative installed' do
-        expect(described_class.new(project).installed?).to be false
-      end
-    end
-
-    context 'knative is installed' do
-      let!(:knative) { create(:clusters_applications_knative, :installed, cluster: cluster) }
-
-      it 'does have knative installed' do
-        expect(described_class.new(project).installed?).to be true
-      end
-    end
-  end
 end
diff --git a/spec/frontend/serverless/components/environment_row_spec.js b/spec/frontend/serverless/components/environment_row_spec.js
index 161a637dd75..0ad85e218dc 100644
--- a/spec/frontend/serverless/components/environment_row_spec.js
+++ b/spec/frontend/serverless/components/environment_row_spec.js
@@ -14,7 +14,7 @@ describe('environment row component', () => {
 
     beforeEach(() => {
       localVue = createLocalVue();
-      vm = createComponent(localVue, translate(mockServerlessFunctions)['*'], '*');
+      vm = createComponent(localVue, translate(mockServerlessFunctions.functions)['*'], '*');
     });
 
     afterEach(() => vm.$destroy());
@@ -48,7 +48,11 @@ describe('environment row component', () => {
 
     beforeEach(() => {
       localVue = createLocalVue();
-      vm = createComponent(localVue, translate(mockServerlessFunctionsDiffEnv).test, 'test');
+      vm = createComponent(
+        localVue,
+        translate(mockServerlessFunctionsDiffEnv.functions).test,
+        'test',
+      );
     });
 
     afterEach(() => vm.$destroy());
diff --git a/spec/frontend/serverless/components/functions_spec.js b/spec/frontend/serverless/components/functions_spec.js
index 6924fb9e91f..d8a80f8031e 100644
--- a/spec/frontend/serverless/components/functions_spec.js
+++ b/spec/frontend/serverless/components/functions_spec.js
@@ -34,11 +34,11 @@ describe('functionsComponent', () => {
   });
 
   it('should render empty state when Knative is not installed', () => {
+    store.dispatch('receiveFunctionsSuccess', { knative_installed: false });
     component = shallowMount(functionsComponent, {
       localVue,
       store,
       propsData: {
-        installed: false,
         clustersPath: '',
         helpPath: '',
         statusPath: '',
@@ -55,7 +55,6 @@ describe('functionsComponent', () => {
       localVue,
       store,
       propsData: {
-        installed: true,
         clustersPath: '',
         helpPath: '',
         statusPath: '',
@@ -67,12 +66,11 @@ describe('functionsComponent', () => {
   });
 
   it('should render empty state when there is no function data', () => {
-    store.dispatch('receiveFunctionsNoDataSuccess');
+    store.dispatch('receiveFunctionsNoDataSuccess', { knative_installed: true });
     component = shallowMount(functionsComponent, {
       localVue,
       store,
       propsData: {
-        installed: true,
         clustersPath: '',
         helpPath: '',
         statusPath: '',
@@ -91,12 +89,31 @@ describe('functionsComponent', () => {
     );
   });
 
+  it('should render functions and a loader when functions are partially fetched', () => {
+    store.dispatch('receiveFunctionsPartial', {
+      ...mockServerlessFunctions,
+      knative_installed: 'checking',
+    });
+    component = shallowMount(functionsComponent, {
+      localVue,
+      store,
+      propsData: {
+        clustersPath: '',
+        helpPath: '',
+        statusPath: '',
+      },
+      sync: false,
+    });
+
+    expect(component.find('.js-functions-wrapper').exists()).toBe(true);
+    expect(component.find('.js-functions-loader').exists()).toBe(true);
+  });
+
   it('should render the functions list', () => {
     component = shallowMount(functionsComponent, {
       localVue,
       store,
       propsData: {
-        installed: true,
         clustersPath: 'clustersPath',
         helpPath: 'helpPath',
         statusPath,
diff --git a/spec/frontend/serverless/mock_data.js b/spec/frontend/serverless/mock_data.js
index a2c18616324..ef616ceb37f 100644
--- a/spec/frontend/serverless/mock_data.js
+++ b/spec/frontend/serverless/mock_data.js
@@ -1,56 +1,62 @@
-export const mockServerlessFunctions = [
-  {
-    name: 'testfunc1',
-    namespace: 'tm-example',
-    environment_scope: '*',
-    cluster_id: 46,
-    detail_url: '/testuser/testproj/serverless/functions/*/testfunc1',
-    podcount: null,
-    created_at: '2019-02-05T01:01:23Z',
-    url: 'http://testfunc1.tm-example.apps.example.com',
-    description: 'A test service',
-    image: 'knative-test-container-buildtemplate',
-  },
-  {
-    name: 'testfunc2',
-    namespace: 'tm-example',
-    environment_scope: '*',
-    cluster_id: 46,
-    detail_url: '/testuser/testproj/serverless/functions/*/testfunc2',
-    podcount: null,
-    created_at: '2019-02-05T01:01:23Z',
-    url: 'http://testfunc2.tm-example.apps.example.com',
-    description: 'A second test service\nThis one with additional descriptions',
-    image: 'knative-test-echo-buildtemplate',
-  },
-];
+export const mockServerlessFunctions = {
+  knative_installed: true,
+  functions: [
+    {
+      name: 'testfunc1',
+      namespace: 'tm-example',
+      environment_scope: '*',
+      cluster_id: 46,
+      detail_url: '/testuser/testproj/serverless/functions/*/testfunc1',
+      podcount: null,
+      created_at: '2019-02-05T01:01:23Z',
+      url: 'http://testfunc1.tm-example.apps.example.com',
+      description: 'A test service',
+      image: 'knative-test-container-buildtemplate',
+    },
+    {
+      name: 'testfunc2',
+      namespace: 'tm-example',
+      environment_scope: '*',
+      cluster_id: 46,
+      detail_url: '/testuser/testproj/serverless/functions/*/testfunc2',
+      podcount: null,
+      created_at: '2019-02-05T01:01:23Z',
+      url: 'http://testfunc2.tm-example.apps.example.com',
+      description: 'A second test service\nThis one with additional descriptions',
+      image: 'knative-test-echo-buildtemplate',
+    },
+  ],
+};
 
-export const mockServerlessFunctionsDiffEnv = [
-  {
-    name: 'testfunc1',
-    namespace: 'tm-example',
-    environment_scope: '*',
-    cluster_id: 46,
-    detail_url: '/testuser/testproj/serverless/functions/*/testfunc1',
-    podcount: null,
-    created_at: '2019-02-05T01:01:23Z',
-    url: 'http://testfunc1.tm-example.apps.example.com',
-    description: 'A test service',
-    image: 'knative-test-container-buildtemplate',
-  },
-  {
-    name: 'testfunc2',
-    namespace: 'tm-example',
-    environment_scope: 'test',
-    cluster_id: 46,
-    detail_url: '/testuser/testproj/serverless/functions/*/testfunc2',
-    podcount: null,
-    created_at: '2019-02-05T01:01:23Z',
-    url: 'http://testfunc2.tm-example.apps.example.com',
-    description: 'A second test service\nThis one with additional descriptions',
-    image: 'knative-test-echo-buildtemplate',
-  },
-];
+export const mockServerlessFunctionsDiffEnv = {
+  knative_installed: true,
+  functions: [
+    {
+      name: 'testfunc1',
+      namespace: 'tm-example',
+      environment_scope: '*',
+      cluster_id: 46,
+      detail_url: '/testuser/testproj/serverless/functions/*/testfunc1',
+      podcount: null,
+      created_at: '2019-02-05T01:01:23Z',
+      url: 'http://testfunc1.tm-example.apps.example.com',
+      description: 'A test service',
+      image: 'knative-test-container-buildtemplate',
+    },
+    {
+      name: 'testfunc2',
+      namespace: 'tm-example',
+      environment_scope: 'test',
+      cluster_id: 46,
+      detail_url: '/testuser/testproj/serverless/functions/*/testfunc2',
+      podcount: null,
+      created_at: '2019-02-05T01:01:23Z',
+      url: 'http://testfunc2.tm-example.apps.example.com',
+      description: 'A second test service\nThis one with additional descriptions',
+      image: 'knative-test-echo-buildtemplate',
+    },
+  ],
+};
 
 export const mockServerlessFunction = {
   name: 'testfunc1',
diff --git a/spec/frontend/serverless/store/getters_spec.js b/spec/frontend/serverless/store/getters_spec.js
index fb549c8f153..92853fda37c 100644
--- a/spec/frontend/serverless/store/getters_spec.js
+++ b/spec/frontend/serverless/store/getters_spec.js
@@ -32,7 +32,7 @@ describe('Serverless Store Getters', () => {
 
   describe('getFunctions', () => {
     it('should translate the raw function array to group the functions per environment scope', () => {
-      state.functions = mockServerlessFunctions;
+      state.functions = mockServerlessFunctions.functions;
 
       const funcs = getters.getFunctions(state);
 
diff --git a/spec/frontend/serverless/store/mutations_spec.js b/spec/frontend/serverless/store/mutations_spec.js
index ca3053e5c38..e2771c7e5fd 100644
--- a/spec/frontend/serverless/store/mutations_spec.js
+++ b/spec/frontend/serverless/store/mutations_spec.js
@@ -19,13 +19,13 @@ describe('ServerlessMutations', () => {
 
       expect(state.isLoading).toEqual(false);
       expect(state.hasFunctionData).toEqual(true);
-      expect(state.functions).toEqual(mockServerlessFunctions);
+      expect(state.functions).toEqual(mockServerlessFunctions.functions);
     });
 
     it('should ensure loading has stopped and hasFunctionData is false when there are no functions available', () => {
       const state = {};
 
-      mutations[types.RECEIVE_FUNCTIONS_NODATA_SUCCESS](state);
+      mutations[types.RECEIVE_FUNCTIONS_NODATA_SUCCESS](state, { knative_installed: true });
 
       expect(state.isLoading).toEqual(false);
       expect(state.hasFunctionData).toEqual(false);
diff --git a/spec/models/clusters/applications/knative_spec.rb b/spec/models/clusters/applications/knative_spec.rb
index d5974f47190..b38cf96de7e 100644
--- a/spec/models/clusters/applications/knative_spec.rb
+++ b/spec/models/clusters/applications/knative_spec.rb
@@ -3,9 +3,6 @@
 require 'rails_helper'
 
 describe Clusters::Applications::Knative do
-  include KubernetesHelpers
-  include ReactiveCachingHelpers
-
   let(:knative) { create(:clusters_applications_knative) }
 
   include_examples 'cluster application core specs', :clusters_applications_knative
@@ -146,77 +143,4 @@ describe Clusters::Applications::Knative do
   describe 'validations' do
     it { is_expected.to validate_presence_of(:hostname) }
   end
-
-  describe '#service_pod_details' do
-    let(:cluster) { create(:cluster, :project, :provided_by_gcp) }
-    let(:service) { cluster.platform_kubernetes }
-    let(:knative) { create(:clusters_applications_knative, cluster: cluster) }
-
-    let(:namespace) do
-      create(:cluster_kubernetes_namespace,
-        cluster: cluster,
-        cluster_project: cluster.cluster_project,
-        project: cluster.cluster_project.project)
-    end
-
-    before do
-      stub_kubeclient_discover(service.api_url)
-      stub_kubeclient_knative_services
-      stub_kubeclient_service_pods
-      stub_reactive_cache(knative,
-        {
-          services: kube_response(kube_knative_services_body),
-          pods: kube_response(kube_knative_pods_body(cluster.cluster_project.project.name, namespace.namespace))
-        })
-      synchronous_reactive_cache(knative)
-    end
-
-    it 'is able k8s core for pod details' do
-      expect(knative.service_pod_details(namespace.namespace, cluster.cluster_project.project.name)).not_to be_nil
-    end
-  end
-
-  describe '#services' do
-    let(:cluster) { create(:cluster, :project, :provided_by_gcp) }
-    let(:service) { cluster.platform_kubernetes }
-    let(:knative) { create(:clusters_applications_knative, cluster: cluster) }
-
-    let(:namespace) do
-      create(:cluster_kubernetes_namespace,
-        cluster: cluster,
-        cluster_project: cluster.cluster_project,
-        project: cluster.cluster_project.project)
-    end
-
-    subject { knative.services }
-
-    before do
-      stub_kubeclient_discover(service.api_url)
-      stub_kubeclient_knative_services
-      stub_kubeclient_service_pods
-    end
-
-    it 'has an unintialized cache' do
-      is_expected.to be_nil
-    end
-
-    context 'when using synchronous reactive cache' do
-      before do
-        stub_reactive_cache(knative,
-          {
-            services: kube_response(kube_knative_services_body),
-            pods: kube_response(kube_knative_pods_body(cluster.cluster_project.project.name, namespace.namespace))
-          })
-        synchronous_reactive_cache(knative)
-      end
-
-      it 'has cached services' do
-        is_expected.not_to be_nil
-      end
-
-      it 'matches our namespace' do
-        expect(knative.services_for(ns: namespace)).not_to be_nil
-      end
-    end
-  end
 end
diff --git a/spec/models/clusters/cluster_spec.rb b/spec/models/clusters/cluster_spec.rb
index 4739e62289a..60a19ccd48a 100644
--- a/spec/models/clusters/cluster_spec.rb
+++ b/spec/models/clusters/cluster_spec.rb
@@ -38,6 +38,11 @@ describe Clusters::Cluster, :use_clean_rails_memory_store_caching do
 
   it { is_expected.to respond_to :project }
 
+  it do
+    expect(subject.knative_services_finder(subject.project))
+      .to be_instance_of(Clusters::Cluster::KnativeServicesFinder)
+  end
+
   describe '.enabled' do
     subject { described_class.enabled }
 
diff --git a/spec/support/helpers/kubernetes_helpers.rb b/spec/support/helpers/kubernetes_helpers.rb
index 78b7ae9c00c..011c4df0fe5 100644
--- a/spec/support/helpers/kubernetes_helpers.rb
+++ b/spec/support/helpers/kubernetes_helpers.rb
@@ -17,17 +17,38 @@ module KubernetesHelpers
     kube_response(kube_deployments_body)
   end
 
-  def stub_kubeclient_discover(api_url)
+  def stub_kubeclient_discover_base(api_url)
     WebMock.stub_request(:get, api_url + '/api/v1').to_return(kube_response(kube_v1_discovery_body))
-    WebMock.stub_request(:get, api_url + '/apis/extensions/v1beta1').to_return(kube_response(kube_v1beta1_discovery_body))
-    WebMock.stub_request(:get, api_url + '/apis/rbac.authorization.k8s.io/v1').to_return(kube_response(kube_v1_rbac_authorization_discovery_body))
-    WebMock.stub_request(:get, api_url + '/apis/serving.knative.dev/v1alpha1').to_return(kube_response(kube_v1alpha1_serving_knative_discovery_body))
+    WebMock
+      .stub_request(:get, api_url + '/apis/extensions/v1beta1')
+      .to_return(kube_response(kube_v1beta1_discovery_body))
+    WebMock
+      .stub_request(:get, api_url + '/apis/rbac.authorization.k8s.io/v1')
+      .to_return(kube_response(kube_v1_rbac_authorization_discovery_body))
+  end
+
+  def stub_kubeclient_discover(api_url)
+    stub_kubeclient_discover_base(api_url)
+
+    WebMock
+      .stub_request(:get, api_url + '/apis/serving.knative.dev/v1alpha1')
+      .to_return(kube_response(kube_v1alpha1_serving_knative_discovery_body))
+  end
+
+  def stub_kubeclient_discover_knative_not_found(api_url)
+    stub_kubeclient_discover_base(api_url)
+
+    WebMock
+      .stub_request(:get, api_url + '/apis/serving.knative.dev/v1alpha1')
+      .to_return(status: [404, "Resource Not Found"])
   end
 
-  def stub_kubeclient_service_pods(status: nil)
+  def stub_kubeclient_service_pods(response = nil, options = {})
     stub_kubeclient_discover(service.api_url)
-    pods_url = service.api_url + "/api/v1/pods"
-    response = { status: status } if status
+
+    namespace_path = options[:namespace].present? ? "namespaces/#{options[:namespace]}/" : ""
+
+    pods_url = service.api_url + "/api/v1/#{namespace_path}pods"
 
     WebMock.stub_request(:get, pods_url).to_return(response || kube_pods_response)
   end
@@ -56,15 +77,18 @@ module KubernetesHelpers
     WebMock.stub_request(:get, deployments_url).to_return(response || kube_deployments_response)
   end
 
-  def stub_kubeclient_knative_services(**options)
+  def stub_kubeclient_knative_services(options = {})
+    namespace_path = options[:namespace].present? ? "namespaces/#{options[:namespace]}/" : ""
+
     options[:name] ||= "kubetest"
-    options[:namespace] ||= "default"
     options[:domain] ||= "example.com"
+    options[:response] ||= kube_response(kube_knative_services_body(options))
 
     stub_kubeclient_discover(service.api_url)
-    knative_url = service.api_url + "/apis/serving.knative.dev/v1alpha1/services"
 
-    WebMock.stub_request(:get, knative_url).to_return(kube_response(kube_knative_services_body(options)))
+    knative_url = service.api_url + "/apis/serving.knative.dev/v1alpha1/#{namespace_path}services"
+
+    WebMock.stub_request(:get, knative_url).to_return(options[:response])
   end
 
   def stub_kubeclient_get_secret(api_url, **options)