/
harness.go
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/
harness.go
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/*
Copyright 2022 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package mocks
import (
"bytes"
"context"
"flag"
"io"
"strings"
"testing"
"time"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/meta"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
yamlserializer "k8s.io/apimachinery/pkg/runtime/serializer/yaml"
yamlutil "k8s.io/apimachinery/pkg/util/yaml"
"k8s.io/client-go/discovery/cached/disk"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/rest"
"k8s.io/client-go/restmapper"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
"k8s.io/kops/pkg/applylib/mocks/mockkubeapiserver"
"sigs.k8s.io/controller-runtime/pkg/client"
)
var kubeconfig = flag.String("kubeconfig", "", "set to use a real kube-apiserver")
type Harness struct {
*testing.T
k8s *mockkubeapiserver.MockKubeAPIServer
restConfig *rest.Config
restMapper *restmapper.DeferredDiscoveryRESTMapper
Scheme *runtime.Scheme
Ctx context.Context
client client.Client
}
func NewHarness(t *testing.T) *Harness {
h := &Harness{
T: t,
Scheme: runtime.NewScheme(),
Ctx: context.Background(),
}
corev1.AddToScheme(h.Scheme)
t.Cleanup(h.Stop)
return h
}
func (h *Harness) ParseObjects(y string) []*unstructured.Unstructured {
t := h.T
var objects []*unstructured.Unstructured
decoder := yamlutil.NewYAMLOrJSONDecoder(bytes.NewReader([]byte(y)), 100)
for {
var rawObj runtime.RawExtension
if err := decoder.Decode(&rawObj); err != nil {
if err != io.EOF {
t.Fatalf("error decoding yaml: %v", err)
}
break
}
m, _, err := yamlserializer.NewDecodingSerializer(unstructured.UnstructuredJSONScheme).Decode(rawObj.Raw, nil, nil)
if err != nil {
t.Fatalf("error decoding yaml: %v", err)
}
unstructuredMap, err := runtime.DefaultUnstructuredConverter.ToUnstructured(m)
if err != nil {
t.Fatalf("error parsing object: %v", err)
}
unstructuredObj := &unstructured.Unstructured{Object: unstructuredMap}
objects = append(objects, unstructuredObj)
}
return objects
}
func (h *Harness) WithObjects(initObjs ...*unstructured.Unstructured) {
if *kubeconfig == "" {
k8s, err := mockkubeapiserver.NewMockKubeAPIServer(":0")
if err != nil {
h.Fatalf("error building mock kube-apiserver: %v", err)
}
h.k8s = k8s
// TODO: Discover from scheme?
k8s.Add(schema.GroupVersionKind{Group: "", Version: "v1", Kind: "Namespace"}, "namespaces", meta.RESTScopeRoot)
k8s.Add(schema.GroupVersionKind{Group: "", Version: "v1", Kind: "Secret"}, "secrets", meta.RESTScopeNamespace)
k8s.Add(schema.GroupVersionKind{Group: "", Version: "v1", Kind: "ConfigMap"}, "configmaps", meta.RESTScopeNamespace)
addr, err := k8s.StartServing()
if err != nil {
h.Errorf("error starting mock kube-apiserver: %v", err)
}
h.restConfig = &rest.Config{
Host: addr.String(),
}
} else {
kubeconfigPath := *kubeconfig
if strings.HasPrefix(kubeconfigPath, "~/") {
homeDir := homedir.HomeDir()
kubeconfigPath = strings.Replace(kubeconfigPath, "~/", homeDir+"/", 1)
}
restConfig, err := clientcmd.BuildConfigFromFlags("", kubeconfigPath)
if err != nil {
h.Fatalf("error building kubeconfig for %q: %v", kubeconfigPath, err)
}
h.restConfig = restConfig
}
client, err := client.New(h.RESTConfig(), client.Options{})
if err != nil {
h.Fatalf("error building client: %v", err)
}
for _, obj := range initObjs {
if err := client.Create(h.Ctx, obj); err != nil {
h.Errorf("error creating object %v: %v", obj, err)
}
}
h.client = client
}
func (h *Harness) Stop() {
if h.k8s != nil {
if err := h.k8s.Stop(); err != nil {
h.Errorf("error closing mock kube-apiserver: %v", err)
}
}
}
func (h *Harness) DynamicClient() dynamic.Interface {
dynamicClient, err := dynamic.NewForConfig(h.RESTConfig())
if err != nil {
h.Fatalf("error building dynamicClient: %v", err)
}
return dynamicClient
}
func (h *Harness) Client() client.Client {
if h.client == nil {
h.Fatalf("must call Start() before Client()")
}
return h.client
}
func (h *Harness) RESTConfig() *rest.Config {
if h.restConfig == nil {
h.Fatalf("cannot call RESTConfig before Start")
}
return h.restConfig
}
func (h *Harness) RESTMapper() *restmapper.DeferredDiscoveryRESTMapper {
if h.restMapper == nil {
// discoveryClient, err := discovery.NewDiscoveryClientForConfig(h.RESTConfig())
// if err != nil {
// h.Fatalf("error building discovery client: %")
// }
// TODO: Use memory cache or simplified rest mapper
discoveryClient, err := disk.NewCachedDiscoveryClientForConfig(h.RESTConfig(), "/home/justinsb/tmp/discovery", "", time.Minute)
if err != nil {
h.Fatalf("error building discovery client: %v", err)
}
restMapper := restmapper.NewDeferredDiscoveryRESTMapper(discoveryClient)
h.restMapper = restMapper
}
return h.restMapper
}