/
handler.go
218 lines (189 loc) · 7.08 KB
/
handler.go
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package target
import (
"context"
"fmt"
"github.com/google/uuid"
bindErr "github.com/kyma-project/kyma/components/binding/internal/errors"
"github.com/kyma-project/kyma/components/binding/internal/storage"
"github.com/kyma-project/kyma/components/binding/internal/worker"
"github.com/kyma-project/kyma/components/binding/pkg/apis/v1alpha1"
"github.com/pkg/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/client-go/dynamic"
)
type Handler struct {
client dynamic.Interface
storage worker.TargetKindStorage
}
func NewHandler(client dynamic.Interface, storage worker.TargetKindStorage) *Handler {
return &Handler{
client: client,
storage: storage,
}
}
func (h *Handler) AddLabel(b *v1alpha1.Binding) error {
resourceData, err := h.storage.Get(v1alpha1.Kind(b.Spec.Target.Kind))
if err != nil {
return errors.Wrapf(err, "while getting Kind %s from storage", b.Spec.Target.Kind)
}
resource, err := h.getResource(b, resourceData)
if err != nil {
return errors.Wrapf(err, "while getting resource for Binding %s", b.Name)
}
labelsToApply := map[string]string{h.labelKey(b): uuid.New().String()}
if err := h.ensureLabelsAreApplied(resource, labelsToApply, resourceData.LabelFields); err != nil {
return errors.Wrap(err, "while ensuring labels are applied")
}
err = h.updateResource(resource, resourceData)
if err != nil {
return errors.Wrap(err, "while updating resource")
}
return nil
}
func (h *Handler) LabelExist(b *v1alpha1.Binding) (bool, error) {
resourceData, err := h.storage.Get(v1alpha1.Kind(b.Spec.Target.Kind))
if err != nil {
return false, errors.Wrapf(err, "while getting Kind %s from storage", b.Spec.Target.Kind)
}
resource, err := h.getResource(b, resourceData)
if err != nil {
return false, errors.Wrapf(err, "while getting resource for Binding %s", b.Name)
}
resourceLabels, err := h.getResourceLabels(resource, resourceData.LabelFields)
if err != nil {
return false, errors.Wrapf(err, "while getting injected labels for Binding %s", b.Name)
}
for key := range resourceLabels {
if key == h.labelKey(b) {
return true, nil
}
}
return false, nil
}
func (h *Handler) RemoveOldAddNewLabel(b *v1alpha1.Binding) error {
resourceData, err := h.storage.Get(v1alpha1.Kind(b.Spec.Target.Kind))
if err != nil {
return errors.Wrapf(err, "while getting Kind %s from storage", b.Spec.Target.Kind)
}
resource, err := h.getResource(b, resourceData)
if err != nil {
return errors.Wrapf(err, "while getting resource for Binding %s", b.Name)
}
resourceLabels, err := h.getResourceLabels(resource, resourceData.LabelFields)
if err != nil {
return errors.Wrapf(err, "while getting injected labels for Binding %s", b.Name)
}
for key := range resourceLabels {
if key == h.labelKey(b) {
labelsToApply := map[string]string{h.labelKey(b): uuid.New().String()}
if err := h.ensureLabelsAreApplied(resource, labelsToApply, resourceData.LabelFields); err != nil {
return errors.Wrap(err, "while ensuring labels are applied")
}
}
}
err = h.updateResource(resource, resourceData)
if err != nil {
return errors.Wrap(err, "while updating resource")
}
return nil
}
func (h *Handler) RemoveLabel(b *v1alpha1.Binding) error {
resourceData, err := h.storage.Get(v1alpha1.Kind(b.Spec.Target.Kind))
if err != nil {
return errors.Wrapf(err, "while getting Kind %s from storage", b.Spec.Target.Kind)
}
resource, err := h.getResource(b, resourceData)
if err != nil {
return errors.Wrapf(err, "while getting resource for Binding %s", b.Name)
}
existingLabels, err := h.getResourceLabels(resource, resourceData.LabelFields)
if err != nil {
return errors.Wrapf(err, "while getting injected labels for Binding %s", b.Name)
}
labelsToDelete := make([]string, 0)
for key := range existingLabels {
if key != h.labelKey(b) {
continue
}
labelsToDelete = append(labelsToDelete, key)
}
if err := h.ensureLabelsAreDeleted(resource, labelsToDelete, resourceData.LabelFields); err != nil {
return errors.Wrapf(err, "while trying to delete labels %+v", labelsToDelete)
}
err = h.updateResource(resource, resourceData)
if err != nil {
return errors.Wrap(err, "while updating resource")
}
return nil
}
func (h *Handler) getResource(b *v1alpha1.Binding, data *storage.ResourceData) (*unstructured.Unstructured, error) {
resource, err := h.client.Resource(data.Schema).Namespace(b.Namespace).Get(context.Background(), b.Spec.Target.Name, metav1.GetOptions{})
if err != nil {
return nil, bindErr.AsTemporaryError(err, "while getting resource %s %s in namespace %s", b.Spec.Target.Kind, b.Spec.Target.Name, b.Namespace)
}
return resource, nil
}
func (h *Handler) updateResource(resource *unstructured.Unstructured, data *storage.ResourceData) error {
_, err := h.client.Resource(data.Schema).Namespace(resource.GetNamespace()).Update(context.Background(), resource, metav1.UpdateOptions{})
if err != nil {
return bindErr.AsTemporaryError(err, "while updating target resource %s %s in namespace %s", resource.GetKind(), resource.GetName(), resource.GetNamespace())
}
return nil
}
func (h *Handler) getResourceLabels(res *unstructured.Unstructured, labelFields []string) (map[string]string, error) {
labels, err := h.findOrCreateLabelsField(res, labelFields)
if err != nil {
return make(map[string]string, 0), errors.Wrapf(err, "while finding labels field in resource")
}
result := make(map[string]string, 0)
for key, value := range labels {
strKey := fmt.Sprintf("%v", key)
strValue := fmt.Sprintf("%v", value)
result[strKey] = strValue
}
return result, nil
}
func (h *Handler) ensureLabelsAreApplied(res *unstructured.Unstructured, labelsToApply map[string]string, labelFields []string) error {
labels, err := h.findOrCreateLabelsField(res, labelFields)
if err != nil {
return errors.Wrapf(err, "while finding labels field in resource")
}
for k, v := range labelsToApply {
labels[k] = v
}
return nil
}
func (h *Handler) ensureLabelsAreDeleted(res *unstructured.Unstructured, labelsToDelete []string, labelFields []string) error {
labels, err := h.findOrCreateLabelsField(res, labelFields)
if err != nil {
return errors.Wrapf(err, "while finding labels field in resource")
}
for _, v := range labelsToDelete {
delete(labels, v)
}
return nil
}
func (h *Handler) findOrCreateLabelsField(res *unstructured.Unstructured, labelFields []string) (map[string]interface{}, error) {
var val interface{} = res.Object
for i, field := range labelFields {
if m, ok := val.(map[string]interface{}); i < len(labelFields) && ok {
val, ok = m[field]
if !ok {
m[field] = map[string]interface{}{}
val = m[field]
}
} else {
return nil, fmt.Errorf("accessor error: %v is of the type %T, expected map[string]interface{}", val, val)
}
}
result, ok := val.(map[string]interface{})
if !ok {
return nil, fmt.Errorf("expected type of field is map[string]string, but was %T", val)
}
return result, nil
}
// label key is split to prefix (max 253 chars) + name part after slash (max 63 chars)
func (h *Handler) labelKey(b *v1alpha1.Binding) string {
return fmt.Sprintf("%s/%s", v1alpha1.BindingLabelKey, b.Name)
}