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client.go
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client.go
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package dclient
import (
"context"
"errors"
"fmt"
"time"
"github.com/kyverno/kyverno/pkg/metrics"
kubeutils "github.com/kyverno/kyverno/pkg/utils/kube"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/discovery/cached/memory"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/dynamic/dynamicinformer"
"k8s.io/client-go/kubernetes"
certsv1beta1 "k8s.io/client-go/kubernetes/typed/certificates/v1beta1"
corev1 "k8s.io/client-go/kubernetes/typed/core/v1"
"k8s.io/client-go/rest"
)
type Interface interface {
// NewDynamicSharedInformerFactory returns a new instance of DynamicSharedInformerFactory
NewDynamicSharedInformerFactory(time.Duration) dynamicinformer.DynamicSharedInformerFactory
// GetEventsInterface provides typed interface for events
GetEventsInterface() (corev1.EventInterface, error)
// GetDynamicInterface fetches underlying dynamic interface
GetDynamicInterface() dynamic.Interface
// Discovery return the discovery client implementation
Discovery() IDiscovery
// SetDiscovery sets the discovery client implementation
SetDiscovery(discoveryClient IDiscovery)
RawAbsPath(path string) ([]byte, error)
// GetResource returns the resource in unstructured/json format
GetResource(apiVersion string, kind string, namespace string, name string, subresources ...string) (*unstructured.Unstructured, error)
// PatchResource patches the resource
PatchResource(apiVersion string, kind string, namespace string, name string, patch []byte) (*unstructured.Unstructured, error)
// ListResource returns the list of resources in unstructured/json format
// Access items using []Items
ListResource(apiVersion string, kind string, namespace string, lselector *metav1.LabelSelector) (*unstructured.UnstructuredList, error)
// DeleteResource deletes the specified resource
DeleteResource(apiVersion string, kind string, namespace string, name string, dryRun bool) error
// CreateResource creates object for the specified resource/namespace
CreateResource(apiVersion string, kind string, namespace string, obj interface{}, dryRun bool) (*unstructured.Unstructured, error)
// UpdateResource updates object for the specified resource/namespace
UpdateResource(apiVersion string, kind string, namespace string, obj interface{}, dryRun bool) (*unstructured.Unstructured, error)
// UpdateStatusResource updates the resource "status" subresource
UpdateStatusResource(apiVersion string, kind string, namespace string, obj interface{}, dryRun bool) (*unstructured.Unstructured, error)
// RecordClientQuery publish the client query to the metric
RecordClientQuery(clientQueryOperation metrics.ClientQueryOperation, clientType metrics.ClientType, resourceKind string, resourceNamespace string)
}
// Client enables interaction with k8 resource
type client struct {
client dynamic.Interface
discoveryClient IDiscovery
clientConfig *rest.Config
kclient kubernetes.Interface
metricsConfig metrics.MetricsConfigManager
restClient rest.Interface
}
// NewClient creates new instance of client
func NewClient(ctx context.Context, config *rest.Config, kclient *kubernetes.Clientset, metricsConfig metrics.MetricsConfigManager, resync time.Duration) (Interface, error) {
dclient, err := dynamic.NewForConfig(config)
if err != nil {
return nil, err
}
client := client{
client: dclient,
clientConfig: config,
kclient: kclient,
restClient: kclient.RESTClient(),
}
if metricsConfig != nil {
client.metricsConfig = metricsConfig
}
// Set discovery client
discoveryClient := &serverPreferredResources{
cachedClient: memory.NewMemCacheClient(kclient.Discovery()),
}
// client will invalidate registered resources cache every x seconds,
// As there is no way to identify if the registered resource is available or not
// we will be invalidating the local cache, so the next request get a fresh cache
// If a resource is removed then and cache is not invalidate yet, we will not detect the removal
// but the re-sync shall re-evaluate
go discoveryClient.Poll(ctx, resync)
client.SetDiscovery(discoveryClient)
return &client, nil
}
// NewDynamicSharedInformerFactory returns a new instance of DynamicSharedInformerFactory
func (c *client) NewDynamicSharedInformerFactory(defaultResync time.Duration) dynamicinformer.DynamicSharedInformerFactory {
return dynamicinformer.NewDynamicSharedInformerFactory(c.client, defaultResync)
}
// GetEventsInterface provides typed interface for events
func (c *client) GetEventsInterface() (corev1.EventInterface, error) {
return c.kclient.CoreV1().Events(""), nil
}
// GetCSRInterface provides type interface for CSR
func (c *client) GetCSRInterface() (certsv1beta1.CertificateSigningRequestInterface, error) {
return c.kclient.CertificatesV1beta1().CertificateSigningRequests(), nil
}
func (c *client) getInterface(apiVersion string, kind string) dynamic.NamespaceableResourceInterface {
return c.client.Resource(c.getGroupVersionMapper(apiVersion, kind))
}
func (c *client) getResourceInterface(apiVersion string, kind string, namespace string) dynamic.ResourceInterface {
// Get the resource interface from kind
namespaceableInterface := c.getInterface(apiVersion, kind)
// Get the namespacable interface
var resourceInteface dynamic.ResourceInterface
if namespace != "" {
resourceInteface = namespaceableInterface.Namespace(namespace)
} else {
resourceInteface = namespaceableInterface
}
return resourceInteface
}
// Keep this a stateful as the resource list will be based on the kubernetes version we connect to
func (c *client) getGroupVersionMapper(apiVersion string, kind string) schema.GroupVersionResource {
if apiVersion == "" {
gvr, _ := c.discoveryClient.GetGVRFromKind(kind)
return gvr
}
return c.discoveryClient.GetGVRFromAPIVersionKind(apiVersion, kind)
}
// GetResource returns the resource in unstructured/json format
func (c *client) GetResource(apiVersion string, kind string, namespace string, name string, subresources ...string) (*unstructured.Unstructured, error) {
c.RecordClientQuery(metrics.ClientGet, metrics.KubeDynamicClient, kind, namespace)
return c.getResourceInterface(apiVersion, kind, namespace).Get(context.TODO(), name, metav1.GetOptions{}, subresources...)
}
func (c *client) RawAbsPath(path string) ([]byte, error) {
if c.restClient == nil {
return nil, errors.New("rest client not supported")
}
return c.restClient.Get().RequestURI(path).DoRaw(context.TODO())
}
// PatchResource patches the resource
func (c *client) PatchResource(apiVersion string, kind string, namespace string, name string, patch []byte) (*unstructured.Unstructured, error) {
c.RecordClientQuery(metrics.ClientUpdate, metrics.KubeDynamicClient, kind, namespace)
return c.getResourceInterface(apiVersion, kind, namespace).Patch(context.TODO(), name, types.JSONPatchType, patch, metav1.PatchOptions{})
}
// GetDynamicInterface fetches underlying dynamic interface
func (c *client) GetDynamicInterface() dynamic.Interface {
return c.client
}
// ListResource returns the list of resources in unstructured/json format
// Access items using []Items
func (c *client) ListResource(apiVersion string, kind string, namespace string, lselector *metav1.LabelSelector) (*unstructured.UnstructuredList, error) {
options := metav1.ListOptions{}
if lselector != nil {
options = metav1.ListOptions{LabelSelector: metav1.FormatLabelSelector(lselector)}
}
c.RecordClientQuery(metrics.ClientList, metrics.KubeDynamicClient, kind, namespace)
return c.getResourceInterface(apiVersion, kind, namespace).List(context.TODO(), options)
}
// DeleteResource deletes the specified resource
func (c *client) DeleteResource(apiVersion string, kind string, namespace string, name string, dryRun bool) error {
options := metav1.DeleteOptions{}
if dryRun {
options = metav1.DeleteOptions{DryRun: []string{metav1.DryRunAll}}
}
c.RecordClientQuery(metrics.ClientDelete, metrics.KubeDynamicClient, kind, namespace)
return c.getResourceInterface(apiVersion, kind, namespace).Delete(context.TODO(), name, options)
}
// CreateResource creates object for the specified resource/namespace
func (c *client) CreateResource(apiVersion string, kind string, namespace string, obj interface{}, dryRun bool) (*unstructured.Unstructured, error) {
options := metav1.CreateOptions{}
if dryRun {
options = metav1.CreateOptions{DryRun: []string{metav1.DryRunAll}}
}
// convert typed to unstructured obj
if unstructuredObj, err := kubeutils.ConvertToUnstructured(obj); err == nil && unstructuredObj != nil {
c.RecordClientQuery(metrics.ClientCreate, metrics.KubeDynamicClient, kind, namespace)
return c.getResourceInterface(apiVersion, kind, namespace).Create(context.TODO(), unstructuredObj, options)
}
return nil, fmt.Errorf("unable to create resource ")
}
// UpdateResource updates object for the specified resource/namespace
func (c *client) UpdateResource(apiVersion string, kind string, namespace string, obj interface{}, dryRun bool) (*unstructured.Unstructured, error) {
options := metav1.UpdateOptions{}
if dryRun {
options = metav1.UpdateOptions{DryRun: []string{metav1.DryRunAll}}
}
// convert typed to unstructured obj
if unstructuredObj, err := kubeutils.ConvertToUnstructured(obj); err == nil && unstructuredObj != nil {
c.RecordClientQuery(metrics.ClientUpdate, metrics.KubeDynamicClient, kind, namespace)
return c.getResourceInterface(apiVersion, kind, namespace).Update(context.TODO(), unstructuredObj, options)
}
return nil, fmt.Errorf("unable to update resource ")
}
// UpdateStatusResource updates the resource "status" subresource
func (c *client) UpdateStatusResource(apiVersion string, kind string, namespace string, obj interface{}, dryRun bool) (*unstructured.Unstructured, error) {
options := metav1.UpdateOptions{}
if dryRun {
options = metav1.UpdateOptions{DryRun: []string{metav1.DryRunAll}}
}
// convert typed to unstructured obj
if unstructuredObj, err := kubeutils.ConvertToUnstructured(obj); err == nil && unstructuredObj != nil {
c.RecordClientQuery(metrics.ClientUpdateStatus, metrics.KubeDynamicClient, kind, namespace)
return c.getResourceInterface(apiVersion, kind, namespace).UpdateStatus(context.TODO(), unstructuredObj, options)
}
return nil, fmt.Errorf("unable to update resource ")
}
// Discovery return the discovery client implementation
func (c *client) Discovery() IDiscovery {
return c.discoveryClient
}
// SetDiscovery sets the discovery client implementation
func (c *client) SetDiscovery(discoveryClient IDiscovery) {
c.discoveryClient = discoveryClient
}
func (c *client) RecordClientQuery(clientQueryOperation metrics.ClientQueryOperation, clientType metrics.ClientType, resourceKind string, resourceNamespace string) {
if c.metricsConfig == nil {
return
}
c.metricsConfig.RecordClientQueries(clientQueryOperation, clientType, resourceKind, resourceNamespace)
}