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// Copyright 2019 The Hugo Authors. All rights reserved.
//
// 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 resources
import (
"context"
"encoding/json"
"io"
"path"
"path/filepath"
"strings"
"sync"
"github.com/gohugoio/hugo/resources/resource"
"github.com/gohugoio/hugo/cache/dynacache"
"github.com/gohugoio/hugo/cache/filecache"
)
func newResourceCache(rs *Spec, memCache *dynacache.Cache) *ResourceCache {
return &ResourceCache{
fileCache: rs.FileCaches.AssetsCache(),
cacheResource: dynacache.GetOrCreatePartition[string, resource.Resource](
memCache,
"/res1",
dynacache.OptionsPartition{ClearWhen: dynacache.ClearOnChange, Weight: 40},
),
cacheResources: dynacache.GetOrCreatePartition[string, resource.Resources](
memCache,
"/ress",
dynacache.OptionsPartition{ClearWhen: dynacache.ClearOnRebuild, Weight: 40},
),
cacheResourceTransformation: dynacache.GetOrCreatePartition[string, *resourceAdapterInner](
memCache,
"/res1/tra",
dynacache.OptionsPartition{ClearWhen: dynacache.ClearOnChange, Weight: 40},
),
}
}
type ResourceCache struct {
sync.RWMutex
cacheResource *dynacache.Partition[string, resource.Resource]
cacheResources *dynacache.Partition[string, resource.Resources]
cacheResourceTransformation *dynacache.Partition[string, *resourceAdapterInner]
fileCache *filecache.Cache
}
func (c *ResourceCache) cleanKey(key string) string {
return strings.TrimPrefix(path.Clean(strings.ToLower(filepath.ToSlash(key))), "/")
}
func (c *ResourceCache) Get(ctx context.Context, key string) (resource.Resource, bool) {
return c.cacheResource.Get(ctx, key)
}
func (c *ResourceCache) GetOrCreate(key string, f func() (resource.Resource, error)) (resource.Resource, error) {
return c.cacheResource.GetOrCreate(key, func(key string) (resource.Resource, error) {
return f()
})
}
func (c *ResourceCache) GetOrCreateResources(key string, f func() (resource.Resources, error)) (resource.Resources, error) {
return c.cacheResources.GetOrCreate(key, func(key string) (resource.Resources, error) {
return f()
})
}
func (c *ResourceCache) getFilenames(key string) (string, string) {
filenameMeta := key + ".json"
filenameContent := key + ".content"
return filenameMeta, filenameContent
}
func (c *ResourceCache) getFromFile(key string) (filecache.ItemInfo, io.ReadCloser, transformedResourceMetadata, bool) {
c.RLock()
defer c.RUnlock()
var meta transformedResourceMetadata
filenameMeta, filenameContent := c.getFilenames(key)
_, jsonContent, _ := c.fileCache.GetBytes(filenameMeta)
if jsonContent == nil {
return filecache.ItemInfo{}, nil, meta, false
}
if err := json.Unmarshal(jsonContent, &meta); err != nil {
return filecache.ItemInfo{}, nil, meta, false
}
fi, rc, _ := c.fileCache.Get(filenameContent)
return fi, rc, meta, rc != nil
}
// writeMeta writes the metadata to file and returns a writer for the content part.
func (c *ResourceCache) writeMeta(key string, meta transformedResourceMetadata) (filecache.ItemInfo, io.WriteCloser, error) {
filenameMeta, filenameContent := c.getFilenames(key)
raw, err := json.Marshal(meta)
if err != nil {
return filecache.ItemInfo{}, nil, err
}
_, fm, err := c.fileCache.WriteCloser(filenameMeta)
if err != nil {
return filecache.ItemInfo{}, nil, err
}
defer fm.Close()
if _, err := fm.Write(raw); err != nil {
return filecache.ItemInfo{}, nil, err
}
fi, fc, err := c.fileCache.WriteCloser(filenameContent)
return fi, fc, err
}
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