generated from sigstore/sigstore-project-template
/
cache.go
56 lines (48 loc) · 1.9 KB
/
cache.go
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//
// Copyright 2022 The Sigstore Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package webhook
import (
"context"
)
type cacheKey struct{}
// CacheResult wraps PolicyResult and errors that are suitable for caching
// purposes. By doing this we can make choices that control things like, should
// errors be cached, and if so, for how long that's independent of the
// successful validations.
type CacheResult struct {
PolicyResult *PolicyResult
Errors []error
}
// FromContext extracts a cache from the provided context. If one has not been
// set, return the NoCache to fulfill the interface but it provides no caching.
func FromContext(ctx context.Context) ResultCache {
x, ok := ctx.Value(cacheKey{}).(ResultCache)
if ok {
return x
}
return &NoCache{}
}
func ToContext(ctx context.Context, cache ResultCache) context.Context {
return context.WithValue(ctx, cacheKey{}, cache)
}
type ResultCache interface {
// Set caches a PolicyResult for a given CIP evaluated for a given image at
// a particular point in time. image, uid & resourceVersion will give a
// unique point in time, so we can make sure we're not caching things that
// are out of date.
Set(ctx context.Context, image, name, uid, resourceVersion string, cacheResult *CacheResult)
// Get returns a cached result for a given image or nil if there are none.
Get(ctx context.Context, image, uid, resourceVersion string) *CacheResult
}