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cache.go
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cache.go
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/******************************************************************************
*
* Copyright 2020 SAP SE
*
* 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 openstack
import (
"context"
"crypto/sha256"
"encoding/hex"
"errors"
"time"
"github.com/redis/go-redis/v9"
"github.com/sapcc/go-bits/logg"
)
// redisCacher is an adapter around *redis.Client that implements the
// gopherpolicy.Cacher interface.
type redisCacher struct {
*redis.Client
}
func hashCacheKey(cacheKey string) string {
sha256Hash := sha256.Sum256([]byte(cacheKey))
return "keystone-" + hex.EncodeToString(sha256Hash[:])
}
func (c redisCacher) StoreTokenPayload(cacheKey string, payload []byte) {
err := c.Set(context.Background(), hashCacheKey(cacheKey), payload, 5*time.Minute).Err()
if err != nil {
logg.Error("cannot cache token payload in Redis: %s", err.Error())
}
}
func (c redisCacher) LoadTokenPayload(cacheKey string) []byte {
payload, err := c.Get(context.Background(), hashCacheKey(cacheKey)).Bytes()
if errors.Is(err, redis.Nil) {
return nil
}
if err != nil {
logg.Error("cannot retrieve token payload from Redis: %s", err.Error())
return nil
}
return payload
}