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keyservice_cache.go
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keyservice_cache.go
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// Copyright © 2022 The Things Network Foundation, The Things Industries B.V.
//
// 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 cryptoutil
import (
"context"
"fmt"
"time"
"github.com/bluele/gcache"
"go.thethings.network/lorawan-stack/v3/pkg/crypto"
)
type cacheKeyServiceEntry struct {
value any
err error
}
type cacheKeyService struct {
crypto.KeyService
cache gcache.Cache
}
// NewCacheKeyService returns a new crypto.KeyService that caches the results of Unwrap.
func NewCacheKeyService(inner crypto.KeyService, ttl time.Duration, size int) crypto.KeyService {
builder := gcache.New(size).ARC()
if ttl != 0 {
builder = builder.Expiration(ttl)
}
return &cacheKeyService{
KeyService: inner,
cache: builder.Build(),
}
}
func (c *cacheKeyService) getOrLoad(
ctx context.Context, cache crypto.CacheKey, key string, loaderFunc func() (any, error),
) (any, error) {
cacheKey := fmt.Sprintf("%s:%s", cache, key)
if val, err := c.cache.Get(cacheKey); err == nil {
crypto.RegisterCacheHit(ctx, cache)
entry := val.(*cacheKeyServiceEntry)
return entry.value, entry.err
}
crypto.RegisterCacheMiss(ctx, cache)
val, err := loaderFunc()
c.cache.Set(cacheKey, &cacheKeyServiceEntry{val, err}) //nolint:errcheck
return val, err
}
func (c *cacheKeyService) Unwrap(ctx context.Context, ciphertext []byte, kekLabel string) ([]byte, error) {
res, err := c.getOrLoad(ctx, crypto.CacheUnwrap, fmt.Sprintf("%s:%X", kekLabel, ciphertext),
func() (any, error) {
return c.KeyService.Unwrap(ctx, ciphertext, kekLabel)
},
)
return res.([]byte), err
}