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07eaa8b369
The rationale for explicit cancellation checks is that these functions have side effects that can be avoided when checking upfront. These side effects can still occur when cancellation happens while the functions are executing, but "already canceled" is common enough that it deserves special handling. Kubernetes-commit: c3f63fc258b73e487da7ca84c40be43fc4c5f4dd
81 lines
1.9 KiB
Go
81 lines
1.9 KiB
Go
/*
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Copyright 2017 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 cached
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import (
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"context"
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"sync"
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"k8s.io/client-go/openapi"
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)
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type groupversion struct {
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delegate openapi.GroupVersionWithContext
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lock sync.Mutex
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docs map[string]docInfo
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}
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var (
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//nolint:staticcheck // Intentionally using the old interface here.
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_ openapi.GroupVersion = &groupversion{}
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_ openapi.GroupVersionWithContext = &groupversion{}
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)
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type docInfo struct {
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data []byte
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err error
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}
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func newGroupVersion(delegate openapi.GroupVersionWithContext) *groupversion {
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return &groupversion{
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delegate: delegate,
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}
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}
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// SchemaWithContext is a better alternative because it supports contextual logging and cancellation.
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//
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// Contextual logging: Use SchemaWithContext instead.
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func (g *groupversion) Schema(contentType string) ([]byte, error) {
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return g.SchemaWithContext(context.Background(), contentType)
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}
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func (g *groupversion) SchemaWithContext(ctx context.Context, contentType string) ([]byte, error) {
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if err := ctx.Err(); err != nil {
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return nil, err
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}
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g.lock.Lock()
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defer g.lock.Unlock()
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cachedInfo, ok := g.docs[contentType]
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if !ok {
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if g.docs == nil {
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g.docs = make(map[string]docInfo)
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}
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cachedInfo.data, cachedInfo.err = g.delegate.SchemaWithContext(ctx, contentType)
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g.docs[contentType] = cachedInfo
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}
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return cachedInfo.data, cachedInfo.err
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}
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func (c *groupversion) ServerRelativeURL() string {
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return c.delegate.ServerRelativeURL()
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}
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