88 lines
1.5 KiB
Go
88 lines
1.5 KiB
Go
package thumbnail
|
|
|
|
import (
|
|
"fmt"
|
|
"image/jpeg"
|
|
"image/png"
|
|
"os"
|
|
"path/filepath"
|
|
"strings"
|
|
|
|
lru "github.com/hashicorp/golang-lru"
|
|
)
|
|
|
|
type Thumbnailer struct {
|
|
Width int
|
|
Height int
|
|
|
|
thumbCache *lru.Cache // threadsafe
|
|
}
|
|
|
|
func NewThumbnailer(Width, Height, MaxCacheSize int) *Thumbnailer {
|
|
thumbCache, err := lru.New(MaxCacheSize)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
return &Thumbnailer{
|
|
Width: Width,
|
|
Height: Height,
|
|
thumbCache: thumbCache,
|
|
}
|
|
}
|
|
|
|
func (this *Thumbnailer) RenderFile(absPath string) ([]byte, error) {
|
|
|
|
thumb, ok := this.thumbCache.Get(absPath)
|
|
if ok {
|
|
return thumb.([]byte), nil
|
|
}
|
|
|
|
// Add to cache
|
|
thumb, err := this.RenderFile_NoCache(absPath)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
this.thumbCache.Add(absPath, thumb)
|
|
return thumb.([]byte), nil
|
|
}
|
|
|
|
func (this *Thumbnailer) RenderFile_NoCache(absPath string) ([]byte, error) {
|
|
|
|
fh, err := os.OpenFile(absPath, os.O_RDONLY, 0400)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
defer fh.Close()
|
|
|
|
extension := strings.ToLower(filepath.Ext(absPath))
|
|
|
|
switch extension {
|
|
case ".jpg", ".jpeg":
|
|
src, err := jpeg.Decode(fh)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return this.RenderScaledImage(src)
|
|
|
|
case ".png":
|
|
src, err := png.Decode(fh)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return this.RenderScaledImage(src)
|
|
|
|
case ".avi", ".mkv", ".mp4", ".ogm", ".wmv":
|
|
return this.RenderScaledFfmpeg(absPath)
|
|
|
|
default:
|
|
return nil, fmt.Errorf("No thumbnailer for file type '%s'", extension)
|
|
|
|
}
|
|
|
|
}
|