mirror of
https://github.com/arangodb/kube-arangodb.git
synced 2024-12-15 17:51:03 +00:00
93 lines
2.6 KiB
Go
93 lines
2.6 KiB
Go
//
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// DISCLAIMER
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//
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// Copyright 2016-2022 ArangoDB GmbH, Cologne, Germany
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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// Copyright holder is ArangoDB GmbH, Cologne, Germany
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//
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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/tools/cache"
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"github.com/arangodb/kube-arangodb/pkg/logging"
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)
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var (
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informerLogger = logging.Global().Get("kubernetes-informer")
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)
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// ResourceWatcher is a helper to watch for events in a specific type
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// of resource. The handler functions are protected from panics.
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type ResourceWatcher struct {
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informer cache.Controller
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}
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// NewResourceWatcher creates a helper that watches for changes in a resource of a specific type.
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// If wraps the given handler functions, such that panics are caught and logged.
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func NewResourceWatcher(getter cache.Getter, resource, namespace string,
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objType runtime.Object, h cache.ResourceEventHandlerFuncs) *ResourceWatcher {
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source := cache.NewListWatchFromClient(
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getter,
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resource,
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namespace,
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fields.Everything())
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_, informer := cache.NewIndexerInformer(source, objType, 0, cache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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defer func() {
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if err := recover(); err != nil {
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informerLogger.Interface("error", err).Error("Recovered from panic")
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}
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}()
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if h.AddFunc != nil {
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h.AddFunc(obj)
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}
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},
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UpdateFunc: func(oldObj, newObj interface{}) {
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defer func() {
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if err := recover(); err != nil {
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informerLogger.Interface("error", err).Error("Recovered from panic")
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}
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}()
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if h.UpdateFunc != nil {
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h.UpdateFunc(oldObj, newObj)
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}
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},
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DeleteFunc: func(obj interface{}) {
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defer func() {
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if err := recover(); err != nil {
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informerLogger.Interface("error", err).Error("Recovered from panic")
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}
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}()
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if h.DeleteFunc != nil {
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h.DeleteFunc(obj)
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}
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},
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}, cache.Indexers{})
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return &ResourceWatcher{
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informer: informer,
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}
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}
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// Run continues to watch for events on the selected type of resource
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// until the given channel is closed.
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func (rw *ResourceWatcher) Run(stopCh <-chan struct{}) {
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rw.informer.Run(stopCh)
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}
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