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// Copyright 2017-present 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 resource
import (
"fmt"
"path/filepath"
"strings"
"sync"
"time"
"github.com/gohugoio/hugo/helpers"
)
type imageCache struct {
absPublishDir string
absCacheDir string
pathSpec *helpers.PathSpec
mu sync.RWMutex
store map[string]*Image
}
func (c *imageCache) isInCache(key string) bool {
c.mu.RLock()
_, found := c.store[key]
c.mu.RUnlock()
return found
}
func (c *imageCache) deleteByPrefix(prefix string) {
c.mu.Lock()
defer c.mu.Unlock()
for k, _ := range c.store {
if strings.HasPrefix(k, prefix) {
delete(c.store, k)
}
}
}
func (c *imageCache) getOrCreate(
parent *Image, key string, create func(resourceCacheFilename string) (*Image, error)) (*Image, error) {
relTargetFilename := key
if c.pathSpec.Language != nil {
// Avoid do and store more work than needed. The language versions will in
// most cases be duplicates of the same image files.
key = strings.TrimPrefix(key, "/"+c.pathSpec.Language.Lang)
}
// First check the in-memory store, then the disk.
c.mu.RLock()
img, found := c.store[key]
c.mu.RUnlock()
if found {
return img, nil
}
// Now look in the file cache.
cacheFilename := filepath.Join(c.absCacheDir, key)
// 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)
exists, err := helpers.Exists(cacheFilename, c.pathSpec.Fs.Source)
if err != nil {
return nil, err
}
if exists {
img = parent.clone()
img.relTargetPath = relTargetFilename
img.absSourceFilename = cacheFilename
} else {
img, err = create(cacheFilename)
if err != nil {
return nil, err
}
}
c.mu.Lock()
if img2, found := c.store[key]; found {
c.mu.Unlock()
return img2, nil
}
c.store[key] = img
c.mu.Unlock()
if !exists {
// File already written to destination
return img, nil
}
return img, img.copyToDestination(cacheFilename)
}
func newImageCache(ps *helpers.PathSpec, absCacheDir, absPublishDir string) *imageCache {
return &imageCache{pathSpec: ps, store: make(map[string]*Image), absCacheDir: absCacheDir, absPublishDir: absPublishDir}
}
func timeTrack(start time.Time, name string) {
elapsed := time.Since(start)
fmt.Printf("%s took %s\n", name, elapsed)
}
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