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feat: cache resized images

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This commit is contained in:
Oleg Lobanov
2020-07-27 19:01:02 +02:00
parent f2f914221c
commit 95bc92955f
7 changed files with 248 additions and 15 deletions
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41
http/preview.go
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@@ -1,8 +1,8 @@
package http
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"net/http"
@@ -23,7 +23,12 @@ type ImgService interface {
Resize(ctx context.Context, in io.Reader, width, height int, out io.Writer, options ...img.Option) error
}
func previewHandler(imgSvc ImgService, enableThumbnails, resizePreview bool) handleFunc {
type FileCache interface {
Store(ctx context.Context, key string, value []byte) error
Load(ctx context.Context, key string) ([]byte, bool, error)
}
func previewHandler(imgSvc ImgService, fileCache FileCache, enableThumbnails, resizePreview bool) handleFunc {
return withUser(func(w http.ResponseWriter, r *http.Request, d *data) (int, error) {
if !d.user.Perm.Download {
return http.StatusAccepted, nil
@@ -49,14 +54,14 @@ func previewHandler(imgSvc ImgService, enableThumbnails, resizePreview bool) han
switch file.Type {
case "image":
return handleImagePreview(imgSvc, w, r, file, size, enableThumbnails, resizePreview)
return handleImagePreview(w, r, imgSvc, fileCache, file, size, enableThumbnails, resizePreview)
default:
return http.StatusNotImplemented, fmt.Errorf("can't create preview for %s type", file.Type)
}
})
}
func handleImagePreview(imgSvc ImgService, w http.ResponseWriter, r *http.Request,
func handleImagePreview(w http.ResponseWriter, r *http.Request, imgSvc ImgService, fileCache FileCache,
file *files.FileInfo, size string, enableThumbnails, resizePreview bool) (int, error) {
format, err := imgSvc.FormatFromExtension(file.Extension)
if err != nil {
@@ -67,6 +72,16 @@ func handleImagePreview(imgSvc ImgService, w http.ResponseWriter, r *http.Reques
return errToStatus(err), err
}
cacheKey := file.Path + size
cachedFile, ok, err := fileCache.Load(r.Context(), cacheKey)
if err != nil {
return errToStatus(err), err
}
if ok {
_, _ = w.Write(cachedFile)
return 0, nil
}
fd, err := file.Fs.Open(file.Path)
if err != nil {
return errToStatus(err), err
@@ -95,12 +110,18 @@ func handleImagePreview(imgSvc ImgService, w http.ResponseWriter, r *http.Reques
return 0, nil
}
if err := imgSvc.Resize(r.Context(), fd, width, height, w, options...); err != nil {
switch {
case errors.Is(err, context.DeadlineExceeded), errors.Is(err, context.Canceled):
default:
return 0, err
}
buf := &bytes.Buffer{}
if err := imgSvc.Resize(context.Background(), fd, width, height, buf, options...); err != nil {
return 0, err
}
go func() {
if err := fileCache.Store(context.Background(), cacheKey, buf.Bytes()); err != nil {
fmt.Printf("failed to cache resized image: %v", err)
}
}()
_, _ = w.Write(buf.Bytes())
return 0, nil
}