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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 (
"image"
"io"
"github.com/gohugoio/hugo/common/hugio"
"github.com/gohugoio/hugo/resources/images"
"github.com/gohugoio/hugo/cache/dynacache"
"github.com/gohugoio/hugo/cache/filecache"
"github.com/gohugoio/hugo/helpers"
)
// ImageCache is a cache for image resources. The backing caches are shared between all sites.
type ImageCache struct {
pathSpec *helpers.PathSpec
fcache *filecache.Cache
mcache *dynacache.Partition[string, *resourceAdapter]
}
func (c *ImageCache) getOrCreate(
parent *imageResource, conf images.ImageConfig,
createImage func() (*imageResource, image.Image, error),
) (*resourceAdapter, error) {
relTarget := parent.relTargetPathFromConfig(conf)
relTargetPath := relTarget.TargetPath()
memKey := dynacache.CleanKey(relTargetPath)
v, err := c.mcache.GetOrCreate(memKey, func(key string) (*resourceAdapter, error) {
var img *imageResource
// These funcs are protected by a named lock.
// read clones the parent to its new name and copies
// the content to the destinations.
read := func(info filecache.ItemInfo, r io.ReadSeeker) error {
img = parent.clone(nil)
targetPath := img.getResourcePaths()
targetPath.File = relTarget.File
img.setTargetPath(targetPath)
img.setOpenSource(func() (hugio.ReadSeekCloser, error) {
return c.fcache.Fs.Open(info.Name)
})
img.setSourceFilenameIsHash(true)
img.setMediaType(conf.TargetFormat.MediaType())
if err := img.InitConfig(r); err != nil {
return err
}
return nil
}
// create creates the image and encodes it to the cache (w).
create := func(info filecache.ItemInfo, w io.WriteCloser) (err error) {
defer w.Close()
var conv image.Image
img, conv, err = createImage()
if err != nil {
return
}
targetPath := img.getResourcePaths()
targetPath.File = relTarget.File
img.setTargetPath(targetPath)
img.setOpenSource(func() (hugio.ReadSeekCloser, error) {
return c.fcache.Fs.Open(info.Name)
})
return img.EncodeTo(conf, conv, w)
}
// Now look in the file cache.
// The definition of this counter is not that we have processed that amount
// (e.g. resized etc.), it can be fetched from file cache,
// but the count of processed image variations for this site.
c.pathSpec.ProcessingStats.Incr(&c.pathSpec.ProcessingStats.ProcessedImages)
_, err := c.fcache.ReadOrCreate(relTargetPath, read, create)
if err != nil {
return nil, err
}
imgAdapter := newResourceAdapter(parent.getSpec(), true, img)
return imgAdapter, nil
})
return v, err
}
func newImageCache(fileCache *filecache.Cache, memCache *dynacache.Cache, ps *helpers.PathSpec) *ImageCache {
return &ImageCache{
fcache: fileCache,
mcache: dynacache.GetOrCreatePartition[string, *resourceAdapter](
memCache,
"/imgs",
dynacache.OptionsPartition{ClearWhen: dynacache.ClearOnChange, Weight: 70},
),
pathSpec: ps,
}
}
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