forked from rook/rook
Travis Nielsen
d0c7d28a63
The operator kit had more utility originally when the operator was creating and managing the TPRs and CRDs directly. Since the CRDs are now created from a manifest and no longer by the operators, the utility of operator kit is limited to the controller watcher. Since we are moving to the controller runtime we simplify the code to make the transition smoother. Now there is only a simple WatchCR method that will need to be replaced as we maek that transition. Signed-off-by: Travis Nielsen <tnielsen@redhat.com>
72 lines
2.1 KiB
Go
72 lines
2.1 KiB
Go
/*
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Copyright 2020 The Rook Authors. All rights reserved.
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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 kit for Kubernetes operators
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package k8sutil
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import (
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"k8s.io/apimachinery/pkg/fields"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/client-go/rest"
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"k8s.io/client-go/tools/cache"
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)
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// CustomResource is for creating a Kubernetes TPR/CRD
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type CustomResource struct {
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// Name of the custom resource
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Name string
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// Plural of the custom resource in plural
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Plural string
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// Group the custom resource belongs to
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Group string
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// Version which should be defined in a const above
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Version string
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// Kind is the serialized interface of the resource.
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Kind string
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}
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// WatchCR begins watching the custom resource (CRD). The call will block until a Done signal is raised during in the context.
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// When the watch has detected a create, update, or delete event, it will handled by the functions in the resourceEventHandlers. After the callback returns, the watch loop will continue for the next event.
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// If the callback returns an error, the error will be logged.
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func WatchCR(resource CustomResource, namespace string, handlers cache.ResourceEventHandlerFuncs, client rest.Interface, objType runtime.Object, done <-chan struct{}) error {
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source := cache.NewListWatchFromClient(
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client,
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resource.Plural,
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namespace,
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fields.Everything())
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_, controller := cache.NewInformer(
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source,
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// The object type.
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objType,
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// resyncPeriod
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// Every resyncPeriod, all resources in the cache will retrigger events.
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// Set to 0 to disable the resync.
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0,
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// Your custom resource event handlers.
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handlers)
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go controller.Run(done)
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<-done
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return nil
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}
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