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claimparametersgen.go
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claimparametersgen.go
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package main
import (
"context"
"encoding/json"
"fmt"
"os"
"strings"
resourceapi "k8s.io/api/resource/v1alpha2"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/watch"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/klog/v2"
"k8s.io/utils/ptr"
fakecrd "github.com/toVersus/fake-dra-driver/api/3-shake.com/resource/fake/v1alpha1"
)
const (
DriverName = fakecrd.GroupName
)
func StartClaimParametersGenerator(ctx context.Context, config *Config) error {
logger := klog.FromContext(ctx)
csconfig, err := GetClientsetConfig(ctx, config.flags)
if err != nil {
return fmt.Errorf("error creating client set config: %w", err)
}
// Create a new dynamic client
dynamicClient, err := dynamic.NewForConfig(csconfig)
if err != nil {
return fmt.Errorf("error creating dynamic client: %w", err)
}
logger.Info("Starting ResourceClaimParameters generator")
// Set up informer to watch for FakeClaimParameters objects
fakeClaimParametersInformer := newFakeClaimParametersInformer(dynamicClient)
// Set up handler for events
fakeClaimParametersInformer.AddEventHandler(cache.ResourceEventHandlerFuncs{
AddFunc: func(obj any) {
unstructured := obj.(*unstructured.Unstructured)
var fakeClaimParameters fakecrd.FakeClaimParameters
err := runtime.DefaultUnstructuredConverter.FromUnstructured(unstructured.Object, &fakeClaimParameters)
if err != nil {
klog.Errorf("Error converting *unstructured.Unstructured to FakeClaimParameters: %v", err)
return
}
if err := createOrUpdateResourceClaimParameters(config.clientset.core, &fakeClaimParameters); err != nil {
klog.Errorf("Error creating ResourceClaimParameters: %v", err)
return
}
},
UpdateFunc: func(oldObj any, newObj any) {
unstructured := newObj.(*unstructured.Unstructured)
var fakeClaimParameters fakecrd.FakeClaimParameters
err := runtime.DefaultUnstructuredConverter.FromUnstructured(unstructured.Object, &fakeClaimParameters)
if err != nil {
klog.Errorf("Error converting *unstructured.Unstructured to FakeClaimParameters: %v", err)
return
}
if err := createOrUpdateResourceClaimParameters(config.clientset.core, &fakeClaimParameters); err != nil {
klog.Errorf("Error updating ResourceClaimParameters: %v", err)
return
}
},
})
// Start informer
fakeClaimParametersInformer.Run(ctx.Done())
return nil
}
func GetClientsetConfig(ctx context.Context, f *Flags) (*rest.Config, error) {
logger := klog.FromContext(ctx)
var csconfig *rest.Config
kubeconfigEnv := os.Getenv("KUBECONFIG")
if kubeconfigEnv != "" {
logger.Info("Found KUBECONFIG environment variable set, using that...")
*f.kubeconfig = kubeconfigEnv
}
var err error
if *f.kubeconfig == "" {
csconfig, err = rest.InClusterConfig()
if err != nil {
return nil, fmt.Errorf("create in-cluster client configuration: %v", err)
}
} else {
csconfig, err = clientcmd.BuildConfigFromFlags("", *f.kubeconfig)
if err != nil {
return nil, fmt.Errorf("create out-of-cluster client configuration: %v", err)
}
}
csconfig.QPS = *f.kubeAPIQPS
csconfig.Burst = *f.kubeAPIBurst
return csconfig, nil
}
func newFakeClaimParametersInformer(dynamicClient dynamic.Interface) cache.SharedIndexInformer {
// Set up shared index informer for FakeClaimParameters objects
gvr := schema.GroupVersionResource{
Group: fakecrd.GroupName,
Version: fakecrd.Version,
Resource: strings.ToLower(fakecrd.FakeClaimParametersKind),
}
informer := cache.NewSharedIndexInformer(
&cache.ListWatch{
ListFunc: func(options metav1.ListOptions) (runtime.Object, error) {
return dynamicClient.Resource(gvr).List(context.Background(), metav1.ListOptions{})
},
WatchFunc: func(options metav1.ListOptions) (watch.Interface, error) {
return dynamicClient.Resource(gvr).Watch(context.Background(), metav1.ListOptions{})
},
},
&unstructured.Unstructured{},
0, // resyncPeriod
cache.Indexers{},
)
return informer
}
func createOrUpdateResourceClaimParameters(clientset kubernetes.Interface, fakeClaimParameters *fakecrd.FakeClaimParameters) error {
namespace := fakeClaimParameters.Namespace
// Get a list of existing ResourceClaimParameters in the same namespace as the incoming FakeClaimParameters
existing, err := clientset.ResourceV1alpha2().ResourceClaimParameters(namespace).List(context.TODO(), metav1.ListOptions{})
if err != nil {
return fmt.Errorf("error listing existing ResourceClaimParameters: %w", err)
}
// Build a new ResourceClaimParameters object from the incoming FakeClaimParameters object
resourceClaimParameters, err := newResourceClaimParametersFromFakeClaimParameters(fakeClaimParameters)
if err != nil {
return fmt.Errorf("error building new ResourceClaimParameters object from a FakeClaimParameters object: %w", err)
}
// If there is an existing ResourceClaimParameters generated from the incoming FakeClaimParameters object, then update it
if len(existing.Items) > 0 {
for _, item := range existing.Items {
if (item.GeneratedFrom.APIGroup == fakecrd.GroupName) &&
(item.GeneratedFrom.Kind == fakeClaimParameters.Kind) &&
(item.GeneratedFrom.Name == fakeClaimParameters.Name) {
klog.Infof("ResourceClaimParameters already exists for FakeClaimParameters %s/%s, updating it", namespace, fakeClaimParameters.Name)
// Copy the matching ResourceClaimParameters metadata into the new ResourceClaimParameters object before updating it
resourceClaimParameters.ObjectMeta = *item.ObjectMeta.DeepCopy()
_, err = clientset.ResourceV1alpha2().ResourceClaimParameters(namespace).Update(context.TODO(), resourceClaimParameters, metav1.UpdateOptions{})
if err != nil {
return fmt.Errorf("error updating ResourceClaimParameters object: %w", err)
}
return nil
}
}
}
// Otherwise create a new ResourceClaimParameters object from the incoming FakeClaimParameters object
_, err = clientset.ResourceV1alpha2().ResourceClaimParameters(namespace).Create(context.TODO(), resourceClaimParameters, metav1.CreateOptions{})
if err != nil {
return fmt.Errorf("error creating ResourceClaimParameters object from FakeClaimParameters object: %w", err)
}
klog.Infof("Created ResourceClaimParameters for FakeClaimParameters %s/%s", namespace, fakeClaimParameters.Name)
return nil
}
func newResourceClaimParametersFromFakeClaimParameters(fakeClaimParameters *fakecrd.FakeClaimParameters) (*resourceapi.ResourceClaimParameters, error) {
namespace := fakeClaimParameters.Namespace
rawSpec, err := json.Marshal(fakeClaimParameters.Spec)
if err != nil {
return nil, fmt.Errorf("error marshaling FakeClaimParamaters to JSON: %w", err)
}
resourceCount := 1
if fakeClaimParameters.Spec.Count != 0 {
resourceCount = fakeClaimParameters.Spec.Count
}
selector := "true"
if fakeClaimParameters.Spec.Selector != nil {
selector = fakeClaimParameters.Spec.Selector.ToNamedResourcesSelector()
}
shareable := true
var resourceRequests []resourceapi.ResourceRequest
// split を指定していても Fake リソースを動的に分割するためリソース要求に
// count で指定した個数だけ準備すれば良い
for i := 0; i < resourceCount; i++ {
resourceRequests = append(resourceRequests, resourceapi.ResourceRequest{
ResourceRequestModel: resourceapi.ResourceRequestModel{
NamedResources: &resourceapi.NamedResourcesRequest{
Selector: selector,
},
},
})
}
resourceClaimParameters := &resourceapi.ResourceClaimParameters{
ObjectMeta: metav1.ObjectMeta{
GenerateName: "resource-claim-parameters-",
Namespace: namespace,
OwnerReferences: []metav1.OwnerReference{
{
APIVersion: fakeClaimParameters.APIVersion,
Kind: fakeClaimParameters.Kind,
Name: fakeClaimParameters.Name,
UID: fakeClaimParameters.UID,
BlockOwnerDeletion: ptr.To(true),
},
},
},
GeneratedFrom: &resourceapi.ResourceClaimParametersReference{
APIGroup: fakecrd.GroupName,
Kind: fakeClaimParameters.Kind,
Name: fakeClaimParameters.Name,
},
DriverRequests: []resourceapi.DriverRequests{
{
DriverName: DriverName,
VendorParameters: runtime.RawExtension{Raw: rawSpec},
Requests: resourceRequests,
},
},
Shareable: shareable,
}
return resourceClaimParameters, nil
}