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cache.go
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cache.go
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// Copyright 2023 The PipeCD 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 objectcache
import (
"encoding/json"
"fmt"
"github.com/pipe-cd/pipecd/pkg/cache"
"github.com/pipe-cd/pipecd/pkg/datastore"
)
type Cache interface {
Get(shard datastore.Shard, id, etag string) ([]byte, error)
Put(shard datastore.Shard, id, etag string, val []byte) error
}
type objectCache struct {
backend cache.Cache
}
func NewCache(c cache.Cache) Cache {
return &objectCache{backend: c}
}
type objectValue struct {
Etag string `json:"etag"`
Data []byte `json:"data"`
}
func (o *objectCache) Get(shard datastore.Shard, id, etag string) ([]byte, error) {
raw, err := o.backend.Get(makeObjectKey(shard, id))
if err != nil {
return nil, err
}
var obj objectValue
if err = json.Unmarshal(raw.([]byte), &obj); err != nil {
return nil, err
}
if etag == obj.Etag {
return obj.Data, nil
}
return nil, cache.ErrNotFound
}
func (o *objectCache) Put(shard datastore.Shard, id, etag string, val []byte) error {
obj := &objectValue{
Etag: etag,
Data: val,
}
data, err := json.Marshal(obj)
if err != nil {
return err
}
return o.backend.Put(makeObjectKey(shard, id), data)
}
func makeObjectKey(shard datastore.Shard, id string) string {
return fmt.Sprintf("FILEDB:OBJECT:%s:%s", shard, id)
}