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controller-runtime: implement a cache.Informer compatible Source
Can be reverted if kubernetes-sigs/controller-runtime#383 merges.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,178 @@ | ||
| /* | ||
| 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. | ||
| */ | ||
|
|
||
| package internal | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
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| logf "github.com/openshift/cluster-ingress-operator/pkg/log" | ||
|
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| "k8s.io/apimachinery/pkg/api/meta" | ||
| "k8s.io/apimachinery/pkg/runtime" | ||
| "k8s.io/client-go/tools/cache" | ||
| "k8s.io/client-go/util/workqueue" | ||
| "sigs.k8s.io/controller-runtime/pkg/event" | ||
| "sigs.k8s.io/controller-runtime/pkg/handler" | ||
|
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| metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" | ||
| "sigs.k8s.io/controller-runtime/pkg/predicate" | ||
| ) | ||
|
|
||
| var log = logf.Logger.WithName("source").WithName("EventHandler") | ||
|
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| var _ cache.ResourceEventHandler = EventHandler{} | ||
|
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| // EventHandler adapts a eventhandler.EventHandler interface to a cache.ResourceEventHandler interface | ||
| type EventHandler struct { | ||
| EventHandler handler.EventHandler | ||
| Queue workqueue.RateLimitingInterface | ||
| Predicates []predicate.Predicate | ||
| } | ||
|
|
||
| // OnAdd creates CreateEvent and calls Create on EventHandler | ||
| func (e EventHandler) OnAdd(obj interface{}) { | ||
| c := event.CreateEvent{} | ||
|
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| // Pull metav1.Object out of the object | ||
| if o, err := meta.Accessor(obj); err == nil { | ||
| c.Meta = o | ||
| } else { | ||
| log.Error(err, "OnAdd missing Meta", | ||
| "object", obj, "type", fmt.Sprintf("%T", obj)) | ||
| return | ||
| } | ||
|
|
||
| // Pull the runtime.Object out of the object | ||
| if o, ok := obj.(runtime.Object); ok { | ||
| c.Object = o | ||
| } else { | ||
| log.Error(nil, "OnAdd missing runtime.Object", | ||
| "object", obj, "type", fmt.Sprintf("%T", obj)) | ||
| return | ||
| } | ||
|
|
||
| for _, p := range e.Predicates { | ||
| if !p.Create(c) { | ||
| return | ||
| } | ||
| } | ||
|
|
||
| // Invoke create handler | ||
| e.EventHandler.Create(c, e.Queue) | ||
| } | ||
|
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| // OnUpdate creates UpdateEvent and calls Update on EventHandler | ||
| func (e EventHandler) OnUpdate(oldObj, newObj interface{}) { | ||
| u := event.UpdateEvent{} | ||
|
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| // Pull metav1.Object out of the object | ||
| if o, err := meta.Accessor(oldObj); err == nil { | ||
| u.MetaOld = o | ||
| } else { | ||
| log.Error(err, "OnUpdate missing MetaOld", | ||
| "object", oldObj, "type", fmt.Sprintf("%T", oldObj)) | ||
| return | ||
| } | ||
|
|
||
| // Pull the runtime.Object out of the object | ||
| if o, ok := oldObj.(runtime.Object); ok { | ||
| u.ObjectOld = o | ||
| } else { | ||
| log.Error(nil, "OnUpdate missing ObjectOld", | ||
| "object", oldObj, "type", fmt.Sprintf("%T", oldObj)) | ||
| return | ||
| } | ||
|
|
||
| // Pull metav1.Object out of the object | ||
| if o, err := meta.Accessor(newObj); err == nil { | ||
| u.MetaNew = o | ||
| } else { | ||
| log.Error(err, "OnUpdate missing MetaNew", | ||
| "object", newObj, "type", fmt.Sprintf("%T", newObj)) | ||
| return | ||
| } | ||
|
|
||
| // Pull the runtime.Object out of the object | ||
| if o, ok := newObj.(runtime.Object); ok { | ||
| u.ObjectNew = o | ||
| } else { | ||
| log.Error(nil, "OnUpdate missing ObjectNew", | ||
| "object", oldObj, "type", fmt.Sprintf("%T", oldObj)) | ||
| return | ||
| } | ||
|
|
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| for _, p := range e.Predicates { | ||
| if !p.Update(u) { | ||
| return | ||
| } | ||
| } | ||
|
|
||
| // Invoke update handler | ||
| e.EventHandler.Update(u, e.Queue) | ||
| } | ||
|
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| // OnDelete creates DeleteEvent and calls Delete on EventHandler | ||
| func (e EventHandler) 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.(metav1.Object); !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 obj to the tombstone obj | ||
| obj = tombstone.Obj | ||
| } | ||
|
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| // Pull metav1.Object out of the object | ||
| if o, err := meta.Accessor(obj); err == nil { | ||
| d.Meta = o | ||
| } else { | ||
| log.Error(err, "OnDelete missing Meta", | ||
| "object", obj, "type", fmt.Sprintf("%T", obj)) | ||
| return | ||
| } | ||
|
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||
| // Pull the runtime.Object out of the object | ||
| if o, ok := obj.(runtime.Object); ok { | ||
| d.Object = o | ||
| } else { | ||
| log.Error(nil, "OnDelete missing runtime.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 | ||
| e.EventHandler.Delete(d, e.Queue) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,69 @@ | ||
| /* | ||
| 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. | ||
| */ | ||
|
|
||
| package source | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
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| "github.com/openshift/cluster-ingress-operator/pkg/util/source/internal" | ||
|
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| "k8s.io/client-go/util/workqueue" | ||
| "sigs.k8s.io/controller-runtime/pkg/handler" | ||
|
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| "sigs.k8s.io/controller-runtime/pkg/cache" | ||
| "sigs.k8s.io/controller-runtime/pkg/predicate" | ||
| "sigs.k8s.io/controller-runtime/pkg/source" | ||
| ) | ||
|
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| // Informer is used to provide a source of events originating inside the cluster from Watches (e.g. Pod Create) | ||
| type Informer struct { | ||
| // Informer is the controller-runtime Informer | ||
| Informer cache.Informer | ||
| } | ||
|
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| var _ source.Source = &Informer{} | ||
|
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| // Start is internal and should be called only by the Controller to register an EventHandler with the Informer | ||
| // to enqueue reconcile.Requests. | ||
| func (is *Informer) Start(handler handler.EventHandler, queue workqueue.RateLimitingInterface, | ||
| prct ...predicate.Predicate) error { | ||
|
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| // Informer should have been specified by the user. | ||
| if is.Informer == nil { | ||
| return fmt.Errorf("must specify Informer.Informer") | ||
| } | ||
|
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| is.Informer.AddEventHandler(internal.EventHandler{Queue: queue, EventHandler: handler, Predicates: prct}) | ||
| return nil | ||
| } | ||
|
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| func (is *Informer) String() string { | ||
| return fmt.Sprintf("informer source: %p", is.Informer) | ||
| } | ||
|
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| // Func is a function that implements Source | ||
| type Func func(handler.EventHandler, workqueue.RateLimitingInterface, ...predicate.Predicate) error | ||
|
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| // Start implements Source | ||
| func (f Func) Start(evt handler.EventHandler, queue workqueue.RateLimitingInterface, | ||
| pr ...predicate.Predicate) error { | ||
| return f(evt, queue, pr...) | ||
| } | ||
|
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| func (f Func) String() string { | ||
| return fmt.Sprintf("func source: %p", f) | ||
| } |