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// Update performs an atomic update and set of the object. Returns the result of the update
// or an error. If the registry allows create-on-update, the create flow will be executed.
// A bool is returned along with the object and any errors, to indicate object creation.
func (e *Store) Update(ctx context.Context, name string, objInfo rest.UpdatedObjectInfo, createValidation rest.ValidateObjectFunc, updateValidation rest.ValidateObjectUpdateFunc, forceAllowCreate bool, options *metav1.UpdateOptions) (runtime.Object, bool, error) {
key, err := e.KeyFunc(ctx, name)
if err != nil {
return nil, false, err
}
var (
creatingObj runtime.Object
creating = false
)
qualifiedResource := e.qualifiedResourceFromContext(ctx)
storagePreconditions := &storage.Preconditions{}
if preconditions := objInfo.Preconditions(); preconditions != nil {
storagePreconditions.UID = preconditions.UID
storagePreconditions.ResourceVersion = preconditions.ResourceVersion
}
out := e.NewFunc()
// deleteObj is only used in case a deletion is carried out
var deleteObj runtime.Object
err = e.Storage.GuaranteedUpdate(ctx, key, out, true, storagePreconditions, func(existing runtime.Object, res storage.ResponseMeta) (runtime.Object, *uint64, error) {
// 获取etcd中当前资源的最新版本的数据
existingResourceVersion, err := e.Storage.Versioner().ObjectResourceVersion(existing)
if err != nil {
return nil, nil, err
}
if existingResourceVersion == 0 {
if !e.UpdateStrategy.AllowCreateOnUpdate() && !forceAllowCreate {
return nil, nil, apierrors.NewNotFound(qualifiedResource, name)
}
}
// Given the existing object, get the new object
obj, err := objInfo.UpdatedObject(ctx, existing)
if err != nil {
return nil, nil, err
}
// If AllowUnconditionalUpdate() is true and the object specified by
// the user does not have a resource version, then we populate it with
// the latest version. Else, we check that the version specified by
// the user matches the version of latest storage object.
newResourceVersion, err := e.Storage.Versioner().ObjectResourceVersion(obj)
if err != nil {
return nil, nil, err
}
// 无条件更新，通常是yaml文件中不带resourceVersion，然后就在etcd最新版本数据的基础上进行更新
doUnconditionalUpdate := newResourceVersion == 0 && e.UpdateStrategy.AllowUnconditionalUpdate()
if existingResourceVersion == 0 {
var finishCreate FinishFunc = finishNothing
if e.BeginCreate != nil {
fn, err := e.BeginCreate(ctx, obj, newCreateOptionsFromUpdateOptions(options))
if err != nil {
return nil, nil, err
}
finishCreate = fn
defer func() {
finishCreate(ctx, false)
}()
}
creating = true
creatingObj = obj
if err := rest.BeforeCreate(e.CreateStrategy, ctx, obj); err != nil {
return nil, nil, err
}
// at this point we have a fully formed object. It is time to call the validators that the apiserver
// handling chain wants to enforce.
if createValidation != nil {
if err := createValidation(ctx, obj.DeepCopyObject()); err != nil {
return nil, nil, err
}
}
ttl, err := e.calculateTTL(obj, 0, false)
if err != nil {
return nil, nil, err
}
// The operation has succeeded. Call the finish function if there is one,
// and then make sure the defer doesn't call it again.
fn := finishCreate
finishCreate = finishNothing
fn(ctx, true)
return obj, &ttl, nil
}
creating = false
creatingObj = nil
if doUnconditionalUpdate {
// Update the object's resource version to match the latest
// storage object's resource version.
err = e.Storage.Versioner().UpdateObject(obj, res.ResourceVersion)
if err != nil {
return nil, nil, err
}
} else {
// Check if the object's resource version matches the latest
// resource version.
if newResourceVersion == 0 {
// TODO: The Invalid error should have a field for Resource.
// After that field is added, we should fill the Resource and
// leave the Kind field empty. See the discussion in #18526.
qualifiedKind := schema.GroupKind{Group: qualifiedResource.Group, Kind: qualifiedResource.Resource}
fieldErrList := field.ErrorList{field.Invalid(field.NewPath("metadata").Child("resourceVersion"), newResourceVersion, "must be specified for an update")}
return nil, nil, apierrors.NewInvalid(qualifiedKind, name, fieldErrList)
}
// 数据已经发生变化，提示版本冲突
if newResourceVersion != existingResourceVersion {
return nil, nil, apierrors.NewConflict(qualifiedResource, name, fmt.Errorf(OptimisticLockErrorMsg))
}
}
var finishUpdate FinishFunc = finishNothing
if e.BeginUpdate != nil {
fn, err := e.BeginUpdate(ctx, obj, existing, options)
if err != nil {
return nil, nil, err
}
finishUpdate = fn
defer func() {
finishUpdate(ctx, false)
}()
}
if err := rest.BeforeUpdate(e.UpdateStrategy, ctx, obj, existing); err != nil {
return nil, nil, err
}
// at this point we have a fully formed object. It is time to call the validators that the apiserver
// handling chain wants to enforce.
if updateValidation != nil {
if err := updateValidation(ctx, obj.DeepCopyObject(), existing.DeepCopyObject()); err != nil {
return nil, nil, err
}
}
// Check the default delete-during-update conditions, and store-specific conditions if provided
if ShouldDeleteDuringUpdate(ctx, key, obj, existing) &&
(e.ShouldDeleteDuringUpdate == nil || e.ShouldDeleteDuringUpdate(ctx, key, obj, existing)) {
deleteObj = obj
return nil, nil, errEmptiedFinalizers
}
ttl, err := e.calculateTTL(obj, res.TTL, true)
if err != nil {
return nil, nil, err
}
// The operation has succeeded. Call the finish function if there is one,
// and then make sure the defer doesn't call it again.
fn := finishUpdate
finishUpdate = finishNothing
fn(ctx, true)
if int64(ttl) != res.TTL {
return obj, &ttl, nil
}
return obj, nil, nil
}, dryrun.IsDryRun(options.DryRun), nil)
if err != nil {
// delete the object
if err == errEmptiedFinalizers {
return e.deleteWithoutFinalizers(ctx, name, key, deleteObj, storagePreconditions, newDeleteOptionsFromUpdateOptions(options))
}
if creating {
err = storeerr.InterpretCreateError(err, qualifiedResource, name)
err = rest.CheckGeneratedNameError(ctx, e.CreateStrategy, err, creatingObj)
} else {
err = storeerr.InterpretUpdateError(err, qualifiedResource, name)
}
return nil, false, err
}
if creating {
if e.AfterCreate != nil {
e.AfterCreate(out, newCreateOptionsFromUpdateOptions(options))
}
} else {
if e.AfterUpdate != nil {
e.AfterUpdate(out, options)
}
}
if e.Decorator != nil {
e.Decorator(out)
}
return out, creating, nil
}
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