/
cache.go
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/
cache.go
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// Copyright 2017 The LUCI 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 gaemiddleware
import (
"context"
"time"
"go.chromium.org/gae/service/info"
"go.chromium.org/gae/service/memcache"
"github.com/TriggerMail/luci-go/common/retry/transient"
"github.com/TriggerMail/luci-go/server/caching"
)
// blobCacheProvider returns caching.BlobCache implemented on top of luci/gae.
func blobCacheProvider(namespace string) caching.BlobCache {
return &gaeBlobCache{namespace}
}
// gaeBlobCache implements caching.BlobCache.
type gaeBlobCache struct {
ns string
}
func (g gaeBlobCache) Get(c context.Context, key string) ([]byte, error) {
switch itm, err := memcache.GetKey(info.MustNamespace(c, g.ns), key); {
case err == memcache.ErrCacheMiss:
return nil, caching.ErrCacheMiss
case err != nil:
return nil, transient.Tag.Apply(err)
default:
return itm.Value(), nil
}
}
func (g gaeBlobCache) Set(c context.Context, key string, value []byte, exp time.Duration) error {
c = info.MustNamespace(c, g.ns)
item := memcache.NewItem(c, key).SetValue(value).SetExpiration(exp)
if err := memcache.Set(c, item); err != nil {
return transient.Tag.Apply(err)
}
return nil
}