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handlers.go
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handlers.go
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package informermanager
import (
"reflect"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/tools/cache"
)
// NewHandlerOnAllEvents builds a ResourceEventHandler that the function 'fn' will be called on all events(add/update/delete).
func NewHandlerOnAllEvents(fn func(runtime.Object)) cache.ResourceEventHandler {
return &cache.ResourceEventHandlerFuncs{
AddFunc: func(cur interface{}) {
curObj := cur.(runtime.Object)
fn(curObj)
},
UpdateFunc: func(old, cur interface{}) {
curObj := cur.(runtime.Object)
if !reflect.DeepEqual(old, cur) {
fn(curObj)
}
},
DeleteFunc: func(old interface{}) {
if deleted, ok := old.(cache.DeletedFinalStateUnknown); ok {
// This object might be stale but ok for our current usage.
old = deleted.Obj
if old == nil {
return
}
}
oldObj := old.(runtime.Object)
fn(oldObj)
},
}
}
// NewHandlerOnEvents builds a ResourceEventHandler.
func NewHandlerOnEvents(addFunc func(obj interface{}), updateFunc func(oldObj, newObj interface{}), deleteFunc func(obj interface{})) cache.ResourceEventHandler {
return &cache.ResourceEventHandlerFuncs{
AddFunc: addFunc,
UpdateFunc: updateFunc,
DeleteFunc: deleteFunc,
}
}
// NewFilteringHandlerOnAllEvents builds a FilteringResourceEventHandler applies the provided filter to all events
// coming in, ensuring the appropriate nested handler method is invoked.
//
// Note: An object that starts passing the filter after an update is considered an add, and
// an object that stops passing the filter after an update is considered a delete.
// Like the handlers, the filter MUST NOT modify the objects it is given.
func NewFilteringHandlerOnAllEvents(filterFunc func(obj interface{}) bool, addFunc func(obj interface{}),
updateFunc func(oldObj, newObj interface{}), deleteFunc func(obj interface{})) cache.ResourceEventHandler {
return &cache.FilteringResourceEventHandler{
FilterFunc: filterFunc,
Handler: cache.ResourceEventHandlerFuncs{
AddFunc: addFunc,
UpdateFunc: updateFunc,
DeleteFunc: deleteFunc,
},
}
}