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Signed-off-by: Danil Grigorev <danil.grigorev@suse.com>
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/* | ||
Copyright 2018 The Kubernetes Authors. | ||
Licensed under the Apache License, Version 2.0 (the "License"); | ||
you may not use this file except in compliance with the License. | ||
You may obtain a copy of the License at | ||
http://www.apache.org/licenses/LICENSE-2.0 | ||
Unless required by applicable law or agreed to in writing, software | ||
distributed under the License is distributed on an "AS IS" BASIS, | ||
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
See the License for the specific language governing permissions and | ||
limitations under the License. | ||
*/ | ||
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package internal | ||
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import ( | ||
"context" | ||
"fmt" | ||
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"k8s.io/client-go/tools/cache" | ||
"k8s.io/client-go/util/workqueue" | ||
"sigs.k8s.io/controller-runtime/pkg/client" | ||
"sigs.k8s.io/controller-runtime/pkg/event" | ||
"sigs.k8s.io/controller-runtime/pkg/handler" | ||
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"sigs.k8s.io/controller-runtime/pkg/predicate" | ||
) | ||
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// NewObjectEventHandler creates a new TypedEventHandler. | ||
func NewObjectEventHandler[T client.Object](ctx context.Context, queue workqueue.RateLimitingInterface, handler handler.EventHandler, predicates []predicate.Predicate) *ObjectEventHandler[T] { | ||
return &ObjectEventHandler[T]{ | ||
ctx: ctx, | ||
handler: handler, | ||
queue: queue, | ||
predicates: predicates, | ||
} | ||
} | ||
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// ObjectEventHandler adapts a handler.EventHandler interface to a cache.ResourceEventHandler interface. | ||
type ObjectEventHandler[T client.Object] struct { | ||
// ctx stores the context that created the event handler | ||
// that is used to propagate cancellation signals to each handler function. | ||
ctx context.Context | ||
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handler handler.EventHandler | ||
queue workqueue.RateLimitingInterface | ||
predicates []predicate.Predicate | ||
} | ||
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// HandlerFuncs converts EventHandler to a ResourceEventHandlerFuncs | ||
// TODO: switch to ResourceEventHandlerDetailedFuncs with client-go 1.27 | ||
func (e *ObjectEventHandler[T]) HandlerFuncs() cache.ResourceEventHandlerFuncs { | ||
return cache.ResourceEventHandlerFuncs{ | ||
AddFunc: e.OnAdd, | ||
UpdateFunc: e.OnUpdate, | ||
DeleteFunc: e.OnDelete, | ||
} | ||
} | ||
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// OnAdd creates CreateEvent and calls Create on EventHandler. | ||
func (e *ObjectEventHandler[T]) OnAdd(obj interface{}) { | ||
c := event.CreateEvent{} | ||
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// Pull Object out of the object | ||
if o, ok := obj.(T); ok { | ||
c.Object = o | ||
} else { | ||
log.Error(nil, "OnAdd missing Object", | ||
"object", obj, "type", fmt.Sprintf("%T", obj)) | ||
return | ||
} | ||
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for _, p := range e.predicates { | ||
if !p.Create(c) { | ||
return | ||
} | ||
} | ||
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// Invoke create handler | ||
ctx, cancel := context.WithCancel(e.ctx) | ||
defer cancel() | ||
e.handler.Create(ctx, c, e.queue) | ||
} | ||
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// OnUpdate creates UpdateEvent and calls Update on EventHandler. | ||
func (e *ObjectEventHandler[T]) OnUpdate(oldObj, newObj interface{}) { | ||
u := event.UpdateEvent{} | ||
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if o, ok := oldObj.(T); ok { | ||
u.ObjectOld = o | ||
} else { | ||
log.Error(nil, "OnUpdate missing ObjectOld", | ||
"object", oldObj, "type", fmt.Sprintf("%T", oldObj)) | ||
return | ||
} | ||
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// Pull Object out of the object | ||
if o, ok := newObj.(T); ok { | ||
u.ObjectNew = o | ||
} else { | ||
log.Error(nil, "OnUpdate missing ObjectNew", | ||
"object", newObj, "type", fmt.Sprintf("%T", newObj)) | ||
return | ||
} | ||
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for _, p := range e.predicates { | ||
if !p.Update(u) { | ||
return | ||
} | ||
} | ||
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// Invoke update handler | ||
ctx, cancel := context.WithCancel(e.ctx) | ||
defer cancel() | ||
e.handler.Update(ctx, u, e.queue) | ||
} | ||
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// OnDelete creates DeleteEvent and calls Delete on EventHandler. | ||
func (e *ObjectEventHandler[T]) OnDelete(obj interface{}) { | ||
d := event.DeleteEvent{} | ||
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// Deal with tombstone events by pulling the object out. Tombstone events wrap the object in a | ||
// DeleteFinalStateUnknown struct, so the object needs to be pulled out. | ||
// Copied from sample-controller | ||
// This should never happen if we aren't missing events, which we have concluded that we are not | ||
// and made decisions off of this belief. Maybe this shouldn't be here? | ||
var ok bool | ||
if _, ok = obj.(T); !ok { | ||
// If the object doesn't have Metadata, assume it is a tombstone object of type DeletedFinalStateUnknown | ||
tombstone, ok := obj.(cache.DeletedFinalStateUnknown) | ||
if !ok { | ||
log.Error(nil, "Error decoding objects. Expected cache.DeletedFinalStateUnknown", | ||
"type", fmt.Sprintf("%T", obj), | ||
"object", obj) | ||
return | ||
} | ||
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// Set DeleteStateUnknown to true | ||
d.DeleteStateUnknown = true | ||
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// Set obj to the tombstone obj | ||
obj = tombstone.Obj | ||
} | ||
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// Pull Object out of the object | ||
if o, ok := obj.(T); ok { | ||
d.Object = o | ||
} else { | ||
log.Error(nil, "OnDelete missing Object", | ||
"object", obj, "type", fmt.Sprintf("%T", obj)) | ||
return | ||
} | ||
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for _, p := range e.predicates { | ||
if !p.Delete(d) { | ||
return | ||
} | ||
} | ||
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// Invoke delete handler | ||
ctx, cancel := context.WithCancel(e.ctx) | ||
defer cancel() | ||
e.handler.Delete(ctx, d, e.queue) | ||
} |
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