mirror of
https://github.com/ceph/ceph-csi.git
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90 lines
2.3 KiB
Go
90 lines
2.3 KiB
Go
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/*
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Copyright 2015 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 storage
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import (
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"fmt"
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"sync/atomic"
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"k8s.io/apimachinery/pkg/api/meta"
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"k8s.io/apimachinery/pkg/api/validation/path"
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"k8s.io/apimachinery/pkg/runtime"
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)
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type SimpleUpdateFunc func(runtime.Object) (runtime.Object, error)
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// SimpleUpdateFunc converts SimpleUpdateFunc into UpdateFunc
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func SimpleUpdate(fn SimpleUpdateFunc) UpdateFunc {
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return func(input runtime.Object, _ ResponseMeta) (runtime.Object, *uint64, error) {
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out, err := fn(input)
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return out, nil, err
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}
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}
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func EverythingFunc(runtime.Object) bool {
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return true
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}
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func NoTriggerFunc() []MatchValue {
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return nil
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}
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func NoTriggerPublisher(runtime.Object) []MatchValue {
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return nil
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}
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func NamespaceKeyFunc(prefix string, obj runtime.Object) (string, error) {
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meta, err := meta.Accessor(obj)
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if err != nil {
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return "", err
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}
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name := meta.GetName()
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if msgs := path.IsValidPathSegmentName(name); len(msgs) != 0 {
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return "", fmt.Errorf("invalid name: %v", msgs)
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}
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return prefix + "/" + meta.GetNamespace() + "/" + name, nil
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}
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func NoNamespaceKeyFunc(prefix string, obj runtime.Object) (string, error) {
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meta, err := meta.Accessor(obj)
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if err != nil {
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return "", err
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}
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name := meta.GetName()
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if msgs := path.IsValidPathSegmentName(name); len(msgs) != 0 {
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return "", fmt.Errorf("invalid name: %v", msgs)
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}
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return prefix + "/" + name, nil
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}
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// HighWaterMark is a thread-safe object for tracking the maximum value seen
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// for some quantity.
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type HighWaterMark int64
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// Update returns true if and only if 'current' is the highest value ever seen.
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func (hwm *HighWaterMark) Update(current int64) bool {
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for {
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old := atomic.LoadInt64((*int64)(hwm))
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if current <= old {
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return false
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}
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if atomic.CompareAndSwapInt64((*int64)(hwm), old, current) {
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return true
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}
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}
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}
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