/
dualwriter_mode3.go
128 lines (107 loc) · 4.72 KB
/
dualwriter_mode3.go
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package rest
import (
"context"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metainternalversion "k8s.io/apimachinery/pkg/apis/meta/internalversion"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apiserver/pkg/registry/rest"
"k8s.io/klog/v2"
)
type DualWriterMode3 struct {
DualWriter
}
// NewDualWriterMode3 returns a new DualWriter in mode 3.
// Mode 3 represents writing to LegacyStorage and Storage and reading from Storage.
func NewDualWriterMode3(legacy LegacyStorage, storage Storage) *DualWriterMode3 {
return &DualWriterMode3{*NewDualWriter(legacy, storage)}
}
// Create overrides the behavior of the generic DualWriter and writes to LegacyStorage and Storage.
func (d *DualWriterMode3) Create(ctx context.Context, obj runtime.Object, createValidation rest.ValidateObjectFunc, options *metav1.CreateOptions) (runtime.Object, error) {
legacy, ok := d.Legacy.(rest.Creater)
if !ok {
return nil, errDualWriterCreaterMissing
}
created, err := d.Storage.Create(ctx, obj, createValidation, options)
if err != nil {
klog.FromContext(ctx).Error(err, "unable to create object in Storage", "mode", 3)
return created, err
}
if _, err := legacy.Create(ctx, obj, createValidation, options); err != nil {
klog.FromContext(ctx).Error(err, "unable to create object in legacy storage", "mode", 3)
}
return created, nil
}
// Get overrides the behavior of the generic DualWriter and retrieves an object from Storage.
func (d *DualWriterMode3) Get(ctx context.Context, name string, options *metav1.GetOptions) (runtime.Object, error) {
return d.Storage.Get(ctx, name, &metav1.GetOptions{})
}
func (d *DualWriterMode3) Delete(ctx context.Context, name string, deleteValidation rest.ValidateObjectFunc, options *metav1.DeleteOptions) (runtime.Object, bool, error) {
legacy, ok := d.Legacy.(rest.GracefulDeleter)
if !ok {
return nil, false, errDualWriterDeleterMissing
}
deleted, async, err := d.Storage.Delete(ctx, name, deleteValidation, options)
if err != nil {
if !apierrors.IsNotFound(err) {
klog.FromContext(ctx).Error(err, "could not delete from unified store", "mode", Mode3)
return deleted, async, err
}
}
_, _, errLS := legacy.Delete(ctx, name, deleteValidation, options)
if errLS != nil {
if !apierrors.IsNotFound(errLS) {
klog.FromContext(ctx).Error(errLS, "could not delete from legacy store", "mode", Mode3)
}
}
return deleted, async, err
}
// Update overrides the behavior of the generic DualWriter and writes first to Storage and then to LegacyStorage.
func (d *DualWriterMode3) Update(ctx context.Context, name string, objInfo rest.UpdatedObjectInfo, createValidation rest.ValidateObjectFunc, updateValidation rest.ValidateObjectUpdateFunc, forceAllowCreate bool, options *metav1.UpdateOptions) (runtime.Object, bool, error) {
old, err := d.Storage.Get(ctx, name, &metav1.GetOptions{})
if err != nil {
return nil, false, err
}
updated, err := objInfo.UpdatedObject(ctx, old)
if err != nil {
return nil, false, err
}
objInfo = &updateWrapper{
upstream: objInfo,
updated: updated,
}
obj, created, err := d.Storage.Update(ctx, name, objInfo, createValidation, updateValidation, forceAllowCreate, options)
if err != nil {
klog.FromContext(ctx).Error(err, "could not write to US", "mode", Mode3)
return obj, created, err
}
legacy, ok := d.Legacy.(rest.Updater)
if !ok {
klog.FromContext(ctx).Error(errDualWriterUpdaterMissing, "legacy storage update not implemented")
return obj, created, err
}
_, _, errLeg := legacy.Update(ctx, name, &updateWrapper{
upstream: objInfo,
updated: obj,
}, createValidation, updateValidation, forceAllowCreate, options)
if errLeg != nil {
klog.FromContext(ctx).Error(errLeg, "could not update object in legacy store", "mode", Mode3)
}
return obj, created, err
}
// DeleteCollection overrides the behavior of the generic DualWriter and deletes from both LegacyStorage and Storage.
func (d *DualWriterMode3) DeleteCollection(ctx context.Context, deleteValidation rest.ValidateObjectFunc, options *metav1.DeleteOptions, listOptions *metainternalversion.ListOptions) (runtime.Object, error) {
legacy, ok := d.Legacy.(rest.CollectionDeleter)
if !ok {
return nil, errDualWriterCollectionDeleterMissing
}
// #TODO: figure out how to handle partial deletions
deleted, err := d.Storage.DeleteCollection(ctx, deleteValidation, options, listOptions)
if err != nil {
klog.FromContext(ctx).Error(err, "failed to delete collection successfully from Storage", "deletedObjects", deleted)
}
if deleted, err := legacy.DeleteCollection(ctx, deleteValidation, options, listOptions); err != nil {
klog.FromContext(ctx).Error(err, "failed to delete collection successfully from LegacyStorage", "deletedObjects", deleted)
}
return deleted, err
}