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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"
"path/filepath"
"strings"
"sync"
"github.com/gohugoio/hugo/resources/images"
"github.com/gohugoio/hugo/cache/filecache"
"github.com/gohugoio/hugo/helpers"
)
type imageCache struct {
pathSpec *helpers.PathSpec
fileCache *filecache.Cache
mu sync.RWMutex
store map[string]*resourceAdapter
}
func (c *imageCache) deleteIfContains(s string) {
c.mu.Lock()
defer c.mu.Unlock()
s = c.normalizeKeyBase(s)
for k := range c.store {
if strings.Contains(k, s) {
delete(c.store, k)
}
}
}
// The cache key is a lowercase path with Unix style slashes and it always starts with
// a leading slash.
func (c *imageCache) normalizeKey(key string) string {
return "/" + c.normalizeKeyBase(key)
}
func (c *imageCache) normalizeKeyBase(key string) string {
return strings.Trim(strings.ToLower(filepath.ToSlash(key)), "/")
}
func (c *imageCache) clear() {
c.mu.Lock()
defer c.mu.Unlock()
c.store = make(map[string]*resourceAdapter)
}
func (c *imageCache) getOrCreate(
parent *imageResource, conf images.ImageConfig,
createImage func() (*imageResource, image.Image, error)) (*resourceAdapter, error) {
relTarget := parent.relTargetPathFromConfig(conf)
memKey := parent.relTargetPathForRel(relTarget.path(), false, false, false)
memKey = c.normalizeKey(memKey)
// For the file cache we want to generate and store it once if possible.
fileKeyPath := relTarget
if fi := parent.root.getFileInfo(); fi != nil {
fileKeyPath.dir = filepath.ToSlash(filepath.Dir(fi.Meta().Path))
}
fileKey := fileKeyPath.path()
// First check the in-memory store, then the disk.
c.mu.RLock()
cachedImage, found := c.store[memKey]
c.mu.RUnlock()
if found {
return cachedImage, nil
}
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)
rp := img.getResourcePaths()
rp.relTargetDirFile.file = relTarget.file
img.setSourceFilename(info.Name)
img.setMediaType(conf.TargetFormat.MediaType())
if err := img.InitConfig(r); err != nil {
return err
}
r.Seek(0, 0)
w, err := img.openDestinationsForWriting()
if err != nil {
return err
}
if w == nil {
// Nothing to write.
return nil
}
defer w.Close()
_, err = io.Copy(w, r)
return err
}
// 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
}
rp := img.getResourcePaths()
rp.relTargetDirFile.file = relTarget.file
img.setSourceFilename(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.fileCache.ReadOrCreate(fileKey, read, create)
if err != nil {
return nil, err
}
// The file is now stored in this cache.
img.setSourceFs(c.fileCache.Fs)
c.mu.Lock()
if cachedImage, found = c.store[memKey]; found {
c.mu.Unlock()
return cachedImage, nil
}
imgAdapter := newResourceAdapter(parent.getSpec(), true, img)
c.store[memKey] = imgAdapter
c.mu.Unlock()
return imgAdapter, nil
}
func newImageCache(fileCache *filecache.Cache, ps *helpers.PathSpec) *imageCache {
return &imageCache{fileCache: fileCache, pathSpec: ps, store: make(map[string]*resourceAdapter)}
}
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