KubernetesMockServer should provide Kubernetes Aggregated Discovery endpoints in CRUD Mode

[rohanKanojia]

Is your enhancement related to a problem? Please describe

At the moment KubernetesMockServer doesn't support providing opinionated responses for Kubernetes Aggregated Discovery APIs . This causes problems when we try to use KubernetesMockServer with clients other than Fabric8 KubernetesClient like kubectl /helm etc. It logs this warning with used with helm CLI

OpenJDK 64-Bit Server VM warning: Sharing is only supported for boot loader classes because bootstrap classpath has been appended
Jun 18, 2024 6:09:27 PM okhttp3.mockwebserver.MockWebServer$Http2SocketHandler onStream
INFO: MockWebServer[42981] received request: GET /version HTTP/1.1 and responded: HTTP/1.1 200 OK protocol is h2
Jun 18, 2024 6:09:27 PM okhttp3.mockwebserver.MockWebServer$Http2SocketHandler onStream
INFO: MockWebServer[42981] received request: GET /api/v1/namespaces/test/secrets?labelSelector=name%3Dtest-project%2Cowner%3Dhelm HTTP/1.1 and responded: HTTP/1.1 200 OK protocol is h2
Jun 18, 2024 6:09:27 PM okhttp3.mockwebserver.MockWebServer$Http2SocketHandler onStream
INFO: MockWebServer[42981] received request: GET /version?timeout=32s HTTP/1.1 and responded: HTTP/1.1 200 OK protocol is h2
Jun 18, 2024 6:09:27 PM okhttp3.mockwebserver.MockWebServer$Http2SocketHandler onStream
INFO: MockWebServer[42981] received request: GET /api?timeout=32s HTTP/1.1 and responded: HTTP/1.1 200 OK protocol is h2
Jun 18, 2024 6:09:27 PM okhttp3.mockwebserver.MockWebServer$Http2SocketHandler onStream
INFO: MockWebServer[42981] received request: GET /apis?timeout=32s HTTP/1.1 and responded: HTTP/1.1 200 OK protocol is h2
Jun 18, 2024 6:09:28 PM okhttp3.mockwebserver.MockWebServer$Http2SocketHandler onStream
INFO: MockWebServer[42981] received request: GET /api?timeout=32s HTTP/1.1 and responded: HTTP/1.1 200 OK protocol is h2
Jun 18, 2024 6:09:28 PM okhttp3.mockwebserver.MockWebServer$Http2SocketHandler onStream
INFO: MockWebServer[42981] received request: GET /apis?timeout=32s HTTP/1.1 and responded: HTTP/1.1 200 OK protocol is h2
Jun 18, 2024 6:09:28 PM okhttp3.mockwebserver.MockWebServer$2 acceptConnections
INFO: MockWebServer[42981] done accepting connections: Socket closed

Describe the solution you'd like

Fabric8 KubernetesMockServer should provide some opinionated defaults for these endpoints:

• /api
• /apis/
• /apis/{apiGroup}/{apiVersion}

Describe alternatives you've considered

For now I'm using KubernetesMockServer in expectations mode by providing these expectations:

  private void prepareMockWebServerExpectations() {
    server.expect().get()
      .withPath("/version?timeout=32s")
      .andReturn(200, new VersionInfo.Builder()
        .withMajor("1")
        .withMinor("30")
        .build())
      .always();
    server.expect().get().withPath("/api?timeout=32s")
      .andReturn(200, String.format("{\"kind\":\"APIVersions\",\"versions\":[\"v1\"],\"serverAddressByClientCIDRs\":[{\"clientCIDR\":\"0.0.0.0/0\",\"serverAddress\":\"%s:%d\"}]}", server.getHostName(), server.getPort()))
      .always();
    server.expect().get().withPath("/apis?timeout=32s")
      .andReturn(200, createNewAPIGroupList())
      .always();
    server.expect().get().withPath("/api/v1?timeout=32s")
      .andReturn(200, createNewAPIResourceList())
      .always();
    server.expect().get().withPath("/apis/apps/v1?timeout=32s")
      .andReturn(200, createNewAPIResourceList())
      .always();
  }

  private APIResourceList createNewAPIResourceList() {
    APIResourceListBuilder apiResourceListBuilder = new APIResourceListBuilder();
    apiResourceListBuilder.addToResources(new APIResourceBuilder()
        .withNamespaced()
        .withKind("Service")
        .withName("services")
        .withSingularName("service")
      .build());
    apiResourceListBuilder.addToResources(new APIResourceBuilder()
        .withName("deployments")
        .withKind("Deployment")
        .withSingularName("deployment")
        .withNamespaced()
      .build());
    apiResourceListBuilder.addToResources(new APIResourceBuilder()
      .withName("serviceaccounts")
      .withKind("ServiceAccount")
      .withSingularName("serviceaccount")
      .withNamespaced()
      .build());
    return apiResourceListBuilder.build();
  }

  private APIGroupList createNewAPIGroupList() {
    return new APIGroupListBuilder()
      .addToGroups(new APIGroupBuilder()
        .withName("apps")
        .addNewVersion()
        .withGroupVersion("apps/v1")
        .withVersion("v1")
        .endVersion()
        .withNewPreferredVersion()
        .withGroupVersion("apps/v1")
        .withVersion("v1")
        .endPreferredVersion()
        .build())
      .build();
  }

Additional context

No response

[stale]

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