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patch.go
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patch.go
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package utils
import (
"context"
"reflect"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/errors"
"sigs.k8s.io/controller-runtime/pkg/client"
)
func Patch(cl client.Client, ctx context.Context, before runtime.Object, after runtime.Object) error {
resourcePatch := client.MergeFrom(before.DeepCopyObject())
statusPatch := client.MergeFrom(before.DeepCopyObject())
// Convert resources to unstructured for easier comparison
beforeUnstructured, err := runtime.DefaultUnstructuredConverter.ToUnstructured(before)
if err != nil {
return err
}
afterUnstructured, err := runtime.DefaultUnstructuredConverter.ToUnstructured(after)
if err != nil {
return err
}
beforeHasStatus := false
afterHasStatus := false
// Attempt to remove the status for easier comparison
beforeStatus, ok, err := unstructured.NestedFieldCopy(beforeUnstructured, "status")
if err != nil {
return err
}
if ok {
beforeHasStatus = true
// Remove status from object so they can patched separately
unstructured.RemoveNestedField(beforeUnstructured, "status")
}
afterStatus, ok, err := unstructured.NestedFieldCopy(afterUnstructured, "status")
if err != nil {
return err
}
if ok {
afterHasStatus = true
// Remove status from object so they can patched separately
unstructured.RemoveNestedField(afterUnstructured, "status")
}
var errs []error
// Check if there's any difference to patch
if !reflect.DeepEqual(beforeUnstructured, afterUnstructured) {
err = cl.Patch(ctx, after.DeepCopyObject(), resourcePatch)
if err != nil {
errs = append(errs, err)
}
}
// Check if there's any difference in status to patch
if (beforeHasStatus || afterHasStatus) && !reflect.DeepEqual(beforeStatus, afterStatus) {
err = cl.Status().Patch(ctx, after.DeepCopyObject(), statusPatch)
if err != nil {
errs = append(errs, err)
}
}
return errors.NewAggregate(errs)
}