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|
package object
import (
"fmt"
meta "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/tools/cache"
)
// NewIndexerInformer is a copy of the cache.NewIndexerInformer function, but allows custom process function
func NewIndexerInformer(lw cache.ListerWatcher, objType runtime.Object, h cache.ResourceEventHandler, indexers cache.Indexers, builder ProcessorBuilder) (cache.Indexer, cache.Controller) {
clientState := cache.NewIndexer(cache.DeletionHandlingMetaNamespaceKeyFunc, indexers)
cfg := &cache.Config{
Queue: cache.NewDeltaFIFO(cache.MetaNamespaceKeyFunc, clientState),
ListerWatcher: lw,
ObjectType: objType,
FullResyncPeriod: defaultResyncPeriod,
RetryOnError: false,
Process: builder(clientState, h),
}
return clientState, cache.New(cfg)
}
// RecordLatencyFunc is a function for recording api object delta latency
type RecordLatencyFunc func(meta.Object)
// DefaultProcessor is based on the Process function from cache.NewIndexerInformer except it does a conversion.
func DefaultProcessor(convert ToFunc, recordLatency *EndpointLatencyRecorder) ProcessorBuilder {
return func(clientState cache.Indexer, h cache.ResourceEventHandler) cache.ProcessFunc {
return func(obj interface{}) error {
for _, d := range obj.(cache.Deltas) {
if recordLatency != nil {
if o, ok := d.Object.(meta.Object); ok {
recordLatency.init(o)
}
}
switch d.Type {
case cache.Sync, cache.Added, cache.Updated:
obj, err := convert(d.Object.(meta.Object))
if err != nil {
return err
}
if old, exists, err := clientState.Get(obj); err == nil && exists {
if err := clientState.Update(obj); err != nil {
return err
}
h.OnUpdate(old, obj)
} else {
if err := clientState.Add(obj); err != nil {
return err
}
h.OnAdd(obj)
}
if recordLatency != nil {
recordLatency.record()
}
case cache.Deleted:
var obj interface{}
obj, ok := d.Object.(cache.DeletedFinalStateUnknown)
if !ok {
var err error
metaObj, ok := d.Object.(meta.Object)
if !ok {
return fmt.Errorf("unexpected object %v", d.Object)
}
obj, err = convert(metaObj)
if err != nil && err != errPodTerminating {
return err
}
}
if err := clientState.Delete(obj); err != nil {
return err
}
h.OnDelete(obj)
if !ok && recordLatency != nil {
recordLatency.record()
}
}
}
return nil
}
}
}
const defaultResyncPeriod = 0
|
