139 lines
3.7 KiB
Go
139 lines
3.7 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package internal
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import (
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"fmt"
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"k8s.io/client-go/tools/cache"
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"k8s.io/client-go/util/workqueue"
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"sigs.k8s.io/controller-runtime/pkg/client"
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"sigs.k8s.io/controller-runtime/pkg/event"
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"sigs.k8s.io/controller-runtime/pkg/handler"
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logf "sigs.k8s.io/controller-runtime/pkg/internal/log"
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"sigs.k8s.io/controller-runtime/pkg/predicate"
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)
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var log = logf.RuntimeLog.WithName("source").WithName("EventHandler")
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var _ cache.ResourceEventHandler = EventHandler{}
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// EventHandler adapts a handler.EventHandler interface to a cache.ResourceEventHandler interface.
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type EventHandler struct {
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EventHandler handler.EventHandler
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Queue workqueue.RateLimitingInterface
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Predicates []predicate.Predicate
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}
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// OnAdd creates CreateEvent and calls Create on EventHandler.
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func (e EventHandler) OnAdd(obj interface{}) {
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c := event.CreateEvent{}
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// Pull Object out of the object
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if o, ok := obj.(client.Object); ok {
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c.Object = o
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} else {
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log.Error(nil, "OnAdd missing Object",
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"object", obj, "type", fmt.Sprintf("%T", obj))
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return
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}
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for _, p := range e.Predicates {
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if !p.Create(c) {
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return
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}
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}
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// Invoke create handler
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e.EventHandler.Create(c, e.Queue)
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}
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// OnUpdate creates UpdateEvent and calls Update on EventHandler.
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func (e EventHandler) OnUpdate(oldObj, newObj interface{}) {
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u := event.UpdateEvent{}
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if o, ok := oldObj.(client.Object); ok {
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u.ObjectOld = o
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} else {
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log.Error(nil, "OnUpdate missing ObjectOld",
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"object", oldObj, "type", fmt.Sprintf("%T", oldObj))
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return
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}
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// Pull Object out of the object
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if o, ok := newObj.(client.Object); ok {
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u.ObjectNew = o
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} else {
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log.Error(nil, "OnUpdate missing ObjectNew",
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"object", newObj, "type", fmt.Sprintf("%T", newObj))
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return
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}
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for _, p := range e.Predicates {
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if !p.Update(u) {
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return
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}
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}
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// Invoke update handler
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e.EventHandler.Update(u, e.Queue)
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}
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// OnDelete creates DeleteEvent and calls Delete on EventHandler.
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func (e EventHandler) OnDelete(obj interface{}) {
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d := event.DeleteEvent{}
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// Deal with tombstone events by pulling the object out. Tombstone events wrap the object in a
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// DeleteFinalStateUnknown struct, so the object needs to be pulled out.
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// Copied from sample-controller
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// This should never happen if we aren't missing events, which we have concluded that we are not
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// and made decisions off of this belief. Maybe this shouldn't be here?
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var ok bool
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if _, ok = obj.(client.Object); !ok {
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// If the object doesn't have Metadata, assume it is a tombstone object of type DeletedFinalStateUnknown
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tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
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if !ok {
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log.Error(nil, "Error decoding objects. Expected cache.DeletedFinalStateUnknown",
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"type", fmt.Sprintf("%T", obj),
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"object", obj)
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return
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}
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// Set obj to the tombstone obj
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obj = tombstone.Obj
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}
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// Pull Object out of the object
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if o, ok := obj.(client.Object); ok {
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d.Object = o
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} else {
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log.Error(nil, "OnDelete missing Object",
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"object", obj, "type", fmt.Sprintf("%T", obj))
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return
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}
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for _, p := range e.Predicates {
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if !p.Delete(d) {
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return
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}
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}
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// Invoke delete handler
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e.EventHandler.Delete(d, e.Queue)
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}
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