generated from SAP/repository-template
/
synchronizer.go
239 lines (219 loc) · 6.49 KB
/
synchronizer.go
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/*
SPDX-FileCopyrightText: 2023 SAP SE or an SAP affiliate company and clustersecret-operator contributors
SPDX-License-Identifier: Apache-2.0
*/
package framework
import (
"fmt"
"strconv"
"sync"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/tools/cache"
"k8s.io/klog/v2"
)
type syncItem struct {
gvk schema.GroupVersionKind
namespace string
name string
resourceVersion string
}
func (item *syncItem) String() string {
if item.namespace == "" {
return fmt.Sprintf("%s %s %s (%s)", item.gvk.GroupVersion(), item.gvk.Kind, item.name, item.resourceVersion)
} else {
return fmt.Sprintf("%s %s %s/%s (%s)", item.gvk.GroupVersion(), item.gvk.Kind, item.namespace, item.name, item.resourceVersion)
}
}
type Synchronizer struct {
listers map[schema.GroupVersionKind]cache.GenericLister
items map[types.UID]*syncItem
observers map[chan struct{}]chan struct{}
mutex sync.Mutex
}
func newSynchronizer() *Synchronizer {
return &Synchronizer{
listers: make(map[schema.GroupVersionKind]cache.GenericLister),
items: make(map[types.UID]*syncItem),
observers: make(map[chan struct{}]chan struct{}),
}
}
func (s *Synchronizer) Init(informers map[schema.GroupVersionKind]cache.SharedIndexInformer) {
s.lock()
defer s.unlock()
for gvk, informer := range informers {
informer.AddEventHandler(
cache.ResourceEventHandlerFuncs{
AddFunc: s.handleAddEvent,
UpdateFunc: s.handleUpdateEvent,
DeleteFunc: s.handleDeleteEvent,
},
)
// todo: discover resource for gvk (but this requires a discovery client)
// setting it to 'unknown' is a bit hacky, but will probaably not harm since NewGenericLister will use it only when assembling errors
s.listers[gvk] = cache.NewGenericLister(informer.GetIndexer(), schema.GroupResource{Group: gvk.Group, Resource: "unknown"})
}
}
func (s *Synchronizer) WaitUntilSynced() {
var ch chan struct{}
for {
s.lock()
if ch == nil {
ch = make(chan struct{}, 1)
s.observers[ch] = ch
}
for uid, item := range s.items {
lister, ok := s.listers[item.gvk]
if !ok {
panic("encountered unexpected object kind")
}
var obj runtime.Object
var err error
if item.namespace == "" {
obj, err = lister.Get(item.name)
} else {
obj, err = lister.ByNamespace(item.namespace).Get(item.name)
}
if err == nil {
objmeta := obj.(metav1.Object)
if item.resourceVersion != "-" && objmeta.GetUID() == uid && s.compareResourceversion(objmeta.GetResourceVersion(), item.resourceVersion) >= 0 {
klog.V(3).Infof("synchronize (wait): clearing creation/update %s (have: %s)", item, objmeta.GetResourceVersion())
delete(s.items, uid)
} else {
klog.V(3).Infof("synchronize (wait): not clearing %s (have: %s)", item, objmeta.GetResourceVersion())
}
} else if errors.IsNotFound(err) {
if item.resourceVersion == "-" {
klog.V(3).Infof("synchronize (wait): clearing deletion %s", item)
delete(s.items, uid)
} else {
klog.V(3).Infof("synchronize (wait): not clearing %s", item)
}
} else {
klog.Warningf("synchronize (wait): error while getting %s: %s", item, err)
}
}
if len(s.items) == 0 {
delete(s.observers, ch)
s.unlock()
return
}
s.unlock()
<-ch
}
}
func (s *Synchronizer) lock() {
s.mutex.Lock()
}
func (s *Synchronizer) unlock() {
s.mutex.Unlock()
}
func (s *Synchronizer) handleCreation(new runtime.Object) {
s.onAction("create", new)
}
func (s *Synchronizer) handleUpdate(old runtime.Object, new runtime.Object) {
s.onAction("update", new)
}
func (s *Synchronizer) handleDeletion(old runtime.Object) {
s.onAction("delete", old)
}
func (s *Synchronizer) handleAddEvent(new interface{}) {
s.onEvent("add", new)
}
func (s *Synchronizer) handleUpdateEvent(old interface{}, new interface{}) {
s.onEvent("update", new)
}
func (s *Synchronizer) handleDeleteEvent(old interface{}) {
s.onEvent("delete", old)
}
func (s *Synchronizer) onAction(action string, obj runtime.Object) {
s.lock()
defer s.unlock()
if _, ok := s.listers[obj.GetObjectKind().GroupVersionKind()]; !ok {
return
}
objmeta := obj.(metav1.Object)
uid := objmeta.GetUID()
resourceVersion := ""
switch action {
case "create", "update":
resourceVersion = objmeta.GetResourceVersion()
case "delete":
resourceVersion = "-"
default:
panic("this cannot happen")
}
if uid == "" {
panic("encountered object with empty uid")
}
if resourceVersion == "" {
panic("encountered object with empty resource version")
}
if item, ok := s.items[uid]; ok {
if resourceVersion == "-" {
item.resourceVersion = resourceVersion
} else if item.resourceVersion != "-" && s.compareResourceversion(resourceVersion, item.resourceVersion) > 0 {
item.resourceVersion = resourceVersion
}
klog.V(3).Infof("synchronize (action: %s): recording(updating) queue item: %s", action, item)
} else {
s.items[uid] = &syncItem{
gvk: obj.GetObjectKind().GroupVersionKind(),
namespace: objmeta.GetNamespace(),
name: objmeta.GetName(),
resourceVersion: resourceVersion,
}
klog.V(3).Infof("synchronize (action: %s): recording(adding) queue item: %s", action, s.items[uid])
}
for ch := range s.observers {
select {
case ch <- struct{}{}:
default:
}
}
}
func (s *Synchronizer) onEvent(event string, arg interface{}) {
s.lock()
defer s.unlock()
if obj, ok := arg.(runtime.Object); ok {
objmeta := obj.(metav1.Object)
groupVersion := obj.GetObjectKind().GroupVersionKind().GroupVersion()
kind := obj.GetObjectKind().GroupVersionKind().Kind
namespace := objmeta.GetNamespace()
name := objmeta.GetName()
resourceVersion := objmeta.GetResourceVersion()
if namespace == "" {
klog.V(3).Infof("synchronize (event: %s): handling event %s %s %s (%s)", event, groupVersion, kind, name, resourceVersion)
} else {
klog.V(3).Infof("synchronize (event: %s): handling event %s %s %s/%s (%s)", event, groupVersion, kind, namespace, name, resourceVersion)
}
} else {
klog.V(3).Infof("synchronize (event: %s): handling event with unspecified object", event)
}
for ch := range s.observers {
select {
case ch <- struct{}{}:
default:
}
}
}
func (s *Synchronizer) compareResourceversion(x string, y string) int {
i, err := strconv.Atoi(x)
if err != nil {
panic(err)
}
j, err := strconv.Atoi(y)
if err != nil {
panic(err)
}
if i < j {
return -1
}
if i > j {
return 1
}
return 0
}