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feat: wrap content to support remote cache
We can use LRU in content store and wrap some methods to provides remote cache. Here Info, Update, ReaderAt, Walk methods were wraped and they can get, update, and do other operations in LRU cache. Also, we can configure whether to enable cache or not with cache_tag_suffix. Signed-off-by: breezeTuT <y_q_email@163.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| // Copyright Project Harbor 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 content | ||
|
|
||
| import ( | ||
| "errors" | ||
| "os" | ||
|
|
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| lru "github.com/hashicorp/golang-lru/v2" | ||
| ocispec "github.com/opencontainers/image-spec/specs-go/v1" | ||
| ) | ||
|
|
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| type RemoteCache struct { | ||
| // remoteCache is a LRU cache for remote image layers. | ||
| remoteCache *lru.Cache[string, ocispec.Descriptor] | ||
| } | ||
|
|
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| func NewRemoteCache(cacheSize int) (*RemoteCache, error) { | ||
| remoteCache, err := lru.New[string, ocispec.Descriptor](cacheSize) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &RemoteCache{ | ||
| remoteCache: remoteCache, | ||
| }, nil | ||
| } | ||
|
|
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| func (rc *RemoteCache) Values() []ocispec.Descriptor { | ||
| return rc.remoteCache.Values() | ||
| } | ||
|
|
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| func (rc *RemoteCache) Get(key string) (ocispec.Descriptor, bool) { | ||
| return rc.remoteCache.Get(key) | ||
| } | ||
|
|
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| func (rc *RemoteCache) Add(key string, value ocispec.Descriptor) { | ||
| rc.remoteCache.Add(key, value) | ||
| } | ||
|
|
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| func (rc *RemoteCache) Remove(key string) { | ||
| rc.remoteCache.Remove(key) | ||
| } | ||
|
|
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| // Update the value of the key, if the key exists, delete the old value and add the new value. | ||
| func (rc *RemoteCache) Update(key string, value ocispec.Descriptor) error{ | ||
| _, ok := rc.remoteCache.Peek(key) | ||
| if ok{ | ||
| del := rc.remoteCache.Remove(key) | ||
| if !del { | ||
| return errors.New("can not remove the key") | ||
| } | ||
| rc.Add(key, value) | ||
| }else{ | ||
| rc.remoteCache.Add(key, value) | ||
| } | ||
| return nil | ||
| } | ||
|
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| type FileToReaderAt struct { | ||
| file *os.File | ||
| } | ||
|
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| func NewFileToReaderAt(filePath string) (*FileToReaderAt, error) { | ||
| file, err := os.Open(filePath) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &FileToReaderAt{file: file}, nil | ||
| } | ||
|
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| func (f *FileToReaderAt) ReadAt(p []byte, off int64) (int, error) { | ||
| return f.file.ReadAt(p, off) | ||
| } | ||
|
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| func (f *FileToReaderAt) Close() error { | ||
| return f.file.Close() | ||
| } | ||
|
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| func (f *FileToReaderAt) Size() int64 { | ||
| fi, err := f.file.Stat() | ||
| if err != nil { | ||
| return 0 | ||
| } | ||
| return fi.Size() | ||
| } |
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