60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
/*
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Copyright 2025 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 util
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import (
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"sync"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/cli-runtime/pkg/resource"
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)
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// cachingVerifier wraps the given Verifier to cache return values forever.
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type cachingVerifier struct {
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cache map[schema.GroupVersionKind]error
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mu sync.RWMutex
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next resource.Verifier
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}
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// newCachingVerifier creates a new cache using the given underlying verifier.
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func newCachingVerifier(next resource.Verifier) *cachingVerifier {
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return &cachingVerifier{
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cache: make(map[schema.GroupVersionKind]error),
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next: next,
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}
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}
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// HasSupport implements resource.Verifier. It cached return values from the underlying verifier forever.
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func (cv *cachingVerifier) HasSupport(gvk schema.GroupVersionKind) error {
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// Try to get the cached value.
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cv.mu.RLock()
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err, ok := cv.cache[gvk]
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cv.mu.RUnlock()
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if ok {
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return err
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}
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// Cache miss. Get the actual result.
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err = cv.next.HasSupport(gvk)
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// Update the cache.
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cv.mu.Lock()
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cv.cache[gvk] = err
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cv.mu.Unlock()
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return err
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}
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