func (p *patcher) patchSimple(obj runtime.Object, modified []byte, source, namespace, name string) ([]byte, error) {
// Serialize the current configuration of the object from the server.
current, err := runtime.Encode(p.encoder, obj)
if err != nil {
return nil, cmdutil.AddSourceToErr(fmt.Sprintf("serializing current configuration from:\n%v\nfor:", obj), source, err)
}
// Retrieve the original configuration of the object from the annotation.
original, err := kubectl.GetOriginalConfiguration(p.mapping, obj)
if err != nil {
return nil, cmdutil.AddSourceToErr(fmt.Sprintf("retrieving original configuration from:\n%v\nfor:", obj), source, err)
}
// Create the versioned struct from the original from the server for
// strategic patch.
// TODO: Move all structs in apply to use raw data. Can be done once
// builder has a RawResult method which delivers raw data instead of
// internal objects.
versionedObject, _, err := p.decoder.Decode(current, nil, nil)
if err != nil {
return nil, cmdutil.AddSourceToErr(fmt.Sprintf("converting encoded server-side object back to versioned struct:\n%v\nfor:", obj), source, err)
}
// Compute a three way strategic merge patch to send to server.
patch, err := strategicpatch.CreateThreeWayMergePatch(original, modified, current, versionedObject, p.overwrite, strategicpatch.SMPatchVersion_1_5)
// If creating a patch fails, retrying with SMPatchVersion_1_0 is not helpful. So we return the error.
if err != nil {
format := "creating patch with:\noriginal:\n%s\nmodified:\n%s\ncurrent:\n%s\nfor:"
return nil, cmdutil.AddSourceToErr(fmt.Sprintf(format, original, modified, current), source, err)
}
_, err = p.helper.Patch(namespace, name, api.StrategicMergePatchType, patch)
if errors.IsInternalError(err) {
// Retry SMPatchVersion_1_0 when applying the SMPatchVersion_1_5 patch returns an Internal Error (500).
// Because the failure may be due to the server not supporting the SMPatchVersion_1_5 patch.
patch, err = strategicpatch.CreateThreeWayMergePatch(original, modified, current, versionedObject, p.overwrite, strategicpatch.SMPatchVersion_1_0)
if err != nil {
format := "creating patch with:\noriginal:\n%s\nmodified:\n%s\ncurrent:\n%s\nfor:"
return nil, cmdutil.AddSourceToErr(fmt.Sprintf(format, original, modified, current), source, err)
}
_, err = p.helper.Patch(namespace, name, api.StrategicMergePatchType, patch)
}
return patch, err
}
// WithExponentialBackoff will retry webhookFn() up to 5 times with exponentially increasing backoff when
// it returns an error for which apierrors.SuggestsClientDelay() or apierrors.IsInternalError() returns true.
func WithExponentialBackoff(initialBackoff time.Duration, webhookFn func() error) error {
backoff := wait.Backoff{
Duration: initialBackoff,
Factor: 1.5,
Jitter: 0.2,
Steps: 5,
}
var err error
wait.ExponentialBackoff(backoff, func() (bool, error) {
err = webhookFn()
if _, shouldRetry := apierrors.SuggestsClientDelay(err); shouldRetry {
return false, nil
}
if apierrors.IsInternalError(err) {
return false, nil
}
if err != nil {
return false, err
}
return true, nil
})
return err
}
func visitToPatch(originalObj runtime.Object, updates *resource.Info,
f cmdutil.Factory,
mapper meta.RESTMapper, resourceMapper *resource.Mapper,
encoder runtime.Encoder,
out, errOut io.Writer,
defaultVersion unversioned.GroupVersion,
results *editResults,
file string) error {
patchVisitor := resource.NewFlattenListVisitor(updates, resourceMapper)
err := patchVisitor.Visit(func(info *resource.Info, incomingErr error) error {
currOriginalObj := originalObj
// if we're editing a list, then navigate the list to find the item that we're currently trying to edit
if meta.IsListType(originalObj) {
currOriginalObj = nil
editObjUID, err := meta.NewAccessor().UID(info.Object)
if err != nil {
return err
}
listItems, err := meta.ExtractList(originalObj)
if err != nil {
return err
}
// iterate through the list to find the item with the matching UID
for i := range listItems {
originalObjUID, err := meta.NewAccessor().UID(listItems[i])
if err != nil {
return err
}
if editObjUID == originalObjUID {
currOriginalObj = listItems[i]
break
}
}
if currOriginalObj == nil {
return fmt.Errorf("no original object found for %#v", info.Object)
}
}
originalSerialization, err := runtime.Encode(encoder, currOriginalObj)
if err != nil {
return err
}
editedSerialization, err := runtime.Encode(encoder, info.Object)
if err != nil {
return err
}
// compute the patch on a per-item basis
// use strategic merge to create a patch
originalJS, err := yaml.ToJSON(originalSerialization)
if err != nil {
return err
}
editedJS, err := yaml.ToJSON(editedSerialization)
if err != nil {
return err
}
if reflect.DeepEqual(originalJS, editedJS) {
// no edit, so just skip it.
cmdutil.PrintSuccess(mapper, false, out, info.Mapping.Resource, info.Name, false, "skipped")
return nil
}
preconditions := []strategicpatch.PreconditionFunc{strategicpatch.RequireKeyUnchanged("apiVersion"),
strategicpatch.RequireKeyUnchanged("kind"), strategicpatch.RequireMetadataKeyUnchanged("name")}
patch, err := strategicpatch.CreateTwoWayMergePatch(originalJS, editedJS, currOriginalObj, strategicpatch.SMPatchVersion_1_5, preconditions...)
// If creating a patch fails, retrying with SMPatchVersion_1_0 is not helpful. So we return the error.
if err != nil {
glog.V(4).Infof("Unable to calculate diff, no merge is possible: %v", err)
if strategicpatch.IsPreconditionFailed(err) {
return fmt.Errorf("%s", "At least one of apiVersion, kind and name was changed")
}
return err
}
results.version = defaultVersion
patched, err := resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, api.StrategicMergePatchType, patch)
if err != nil {
// Retry SMPatchVersion_1_0 when applying the SMPatchVersion_1_5 patch returns an Internal Error (500).
// Because the failure may be due to the server not supporting the SMPatchVersion_1_5 patch.
if errors.IsInternalError(err) {
patch, err = strategicpatch.CreateTwoWayMergePatch(originalJS, editedJS, currOriginalObj, strategicpatch.SMPatchVersion_1_0)
if err != nil {
glog.V(4).Infof("Unable to calculate diff, no merge is possible: %v", err)
return err
}
patched, err = resource.NewHelper(info.Client, info.Mapping).Patch(info.Namespace, info.Name, api.StrategicMergePatchType, patch)
}
if err != nil {
fmt.Fprintln(out, results.addError(err, info))
return nil
}
}
info.Refresh(patched, true)
cmdutil.PrintSuccess(mapper, false, out, info.Mapping.Resource, info.Name, false, "edited")
return nil
})
return err
}