mirror of https://github.com/gohugoio/hugo.git
126 lines
3.8 KiB
Go
126 lines
3.8 KiB
Go
// Copyright 2019 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package resources
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import (
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"image"
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"io"
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"github.com/gohugoio/hugo/common/hugio"
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"github.com/gohugoio/hugo/resources/images"
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"github.com/gohugoio/hugo/cache/dynacache"
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"github.com/gohugoio/hugo/cache/filecache"
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"github.com/gohugoio/hugo/helpers"
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)
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// ImageCache is a cache for image resources. The backing caches are shared between all sites.
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type ImageCache struct {
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pathSpec *helpers.PathSpec
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fcache *filecache.Cache
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mcache *dynacache.Partition[string, *resourceAdapter]
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}
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func (c *ImageCache) getOrCreate(
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parent *imageResource, conf images.ImageConfig,
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createImage func() (*imageResource, image.Image, error),
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) (*resourceAdapter, error) {
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relTarget := parent.relTargetPathFromConfig(conf)
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relTargetPath := relTarget.TargetPath()
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memKey := relTargetPath
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// For multihost sites, we duplicate language versions of the same resource,
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// so we need to include the language in the key.
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// Note that we don't need to include the language in the file cache key,
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// as the hash will take care of any different content.
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if c.pathSpec.Cfg.IsMultihost() {
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memKey = c.pathSpec.Lang() + memKey
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}
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memKey = dynacache.CleanKey(memKey)
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v, err := c.mcache.GetOrCreate(memKey, func(key string) (*resourceAdapter, error) {
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var img *imageResource
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// These funcs are protected by a named lock.
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// read clones the parent to its new name and copies
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// the content to the destinations.
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read := func(info filecache.ItemInfo, r io.ReadSeeker) error {
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img = parent.clone(nil)
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targetPath := img.getResourcePaths()
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targetPath.File = relTarget.File
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img.setTargetPath(targetPath)
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img.setOpenSource(func() (hugio.ReadSeekCloser, error) {
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return c.fcache.Fs.Open(info.Name)
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})
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img.setSourceFilenameIsHash(true)
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img.setMediaType(conf.TargetFormat.MediaType())
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if err := img.InitConfig(r); err != nil {
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return err
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}
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return nil
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}
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// create creates the image and encodes it to the cache (w).
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create := func(info filecache.ItemInfo, w io.WriteCloser) (err error) {
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defer w.Close()
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var conv image.Image
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img, conv, err = createImage()
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if err != nil {
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return
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}
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targetPath := img.getResourcePaths()
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targetPath.File = relTarget.File
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img.setTargetPath(targetPath)
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img.setOpenSource(func() (hugio.ReadSeekCloser, error) {
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return c.fcache.Fs.Open(info.Name)
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})
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return img.EncodeTo(conf, conv, w)
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}
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// Now look in the file cache.
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// The definition of this counter is not that we have processed that amount
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// (e.g. resized etc.), it can be fetched from file cache,
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// but the count of processed image variations for this site.
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c.pathSpec.ProcessingStats.Incr(&c.pathSpec.ProcessingStats.ProcessedImages)
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_, err := c.fcache.ReadOrCreate(relTargetPath, read, create)
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if err != nil {
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return nil, err
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}
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imgAdapter := newResourceAdapter(parent.getSpec(), true, img)
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return imgAdapter, nil
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})
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return v, err
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}
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func newImageCache(fileCache *filecache.Cache, memCache *dynacache.Cache, ps *helpers.PathSpec) *ImageCache {
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return &ImageCache{
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fcache: fileCache,
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mcache: dynacache.GetOrCreatePartition[string, *resourceAdapter](
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memCache,
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"/imgs",
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dynacache.OptionsPartition{ClearWhen: dynacache.ClearOnChange, Weight: 70},
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),
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pathSpec: ps,
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}
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}
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