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|
package services
import (
"bytes"
"context"
"fmt"
"image"
_ "image/jpeg"
"image/png"
"shrine/repositories"
"shrine/utils/logger"
"shrine/utils/storage"
"time"
"github.com/chromedp/chromedp"
"golang.org/x/image/draw"
_ "golang.org/x/image/webp"
)
const (
thumbnailWidth = 320
thumbnailHeight = 200
captureWidth = 1280
captureHeight = 800
captureTimeout = 30 * time.Second
)
func GenerateThumbnails() {
sites := repositories.ListApprovedSitesForThumbnail()
if len(sites) == 0 {
return
}
logger.Infof("Thumbnails", "Generating thumbnails for %d sites", len(sites))
opts := append(chromedp.DefaultExecAllocatorOptions[:],
chromedp.WindowSize(captureWidth, captureHeight),
chromedp.Flag("headless", true),
chromedp.Flag("disable-gpu", true),
chromedp.Flag("no-sandbox", true),
)
allocCtx, allocCancel := chromedp.NewExecAllocator(context.Background(), opts...)
defer allocCancel()
for _, site := range sites {
var screenshot []byte
ctx, cancel := chromedp.NewContext(allocCtx)
timeoutCtx, timeoutCancel := context.WithTimeout(ctx, captureTimeout)
err := chromedp.Run(timeoutCtx,
chromedp.Navigate(site.URL),
chromedp.Sleep(2*time.Second),
chromedp.FullScreenshot(&screenshot, 90),
)
timeoutCancel()
cancel()
if err != nil {
logger.Errorf("Thumbnails", "Failed to capture %s: %v", site.URL, err)
continue
}
resized, err := resizeScreenshot(screenshot)
if err != nil {
logger.Errorf("Thumbnails", "Failed to resize %s: %v", site.URL, err)
continue
}
path := fmt.Sprintf("districts/thumbnails/%s.png", site.Ref)
err = storage.Upload(path, bytes.NewReader(resized), int64(len(resized)), "image/png")
if err != nil {
logger.Errorf("Thumbnails", "Failed to upload thumbnail for %s: %v", site.URL, err)
continue
}
site.ThumbnailURL = path
repositories.UpdateDistrictSite(&site)
logger.Infof("Thumbnails", "Generated thumbnail for %s", site.URL)
}
logger.Successf("Thumbnails", "Thumbnail generation complete")
}
func GenerateSiteThumbnail(ref string, siteURL string) {
opts := append(chromedp.DefaultExecAllocatorOptions[:],
chromedp.WindowSize(captureWidth, captureHeight),
chromedp.Flag("headless", true),
chromedp.Flag("disable-gpu", true),
chromedp.Flag("no-sandbox", true),
)
allocCtx, allocCancel := chromedp.NewExecAllocator(context.Background(), opts...)
defer allocCancel()
ctx, cancel := chromedp.NewContext(allocCtx)
defer cancel()
timeoutCtx, timeoutCancel := context.WithTimeout(ctx, captureTimeout)
defer timeoutCancel()
var screenshot []byte
err := chromedp.Run(timeoutCtx,
chromedp.Navigate(siteURL),
chromedp.Sleep(2*time.Second),
chromedp.FullScreenshot(&screenshot, 90),
)
if err != nil {
logger.Errorf("Thumbnails", "Failed to capture %s: %v", siteURL, err)
return
}
resized, err := resizeScreenshot(screenshot)
if err != nil {
logger.Errorf("Thumbnails", "Failed to resize %s: %v", siteURL, err)
return
}
path := fmt.Sprintf("districts/thumbnails/%s.png", ref)
err = storage.Upload(path, bytes.NewReader(resized), int64(len(resized)), "image/png")
if err != nil {
logger.Errorf("Thumbnails", "Failed to upload thumbnail for %s: %v", siteURL, err)
return
}
site, findErr := repositories.FindDistrictSiteByRef(ref)
if findErr != nil {
return
}
site.ThumbnailURL = path
repositories.UpdateDistrictSite(site)
logger.Infof("Thumbnails", "Generated thumbnail for %s", siteURL)
}
func resizeScreenshot(data []byte) ([]byte, error) {
src, _, err := image.Decode(bytes.NewReader(data))
if err != nil {
return nil, err
}
dst := image.NewRGBA(image.Rect(0, 0, thumbnailWidth, thumbnailHeight))
draw.CatmullRom.Scale(dst, dst.Bounds(), src, src.Bounds(), draw.Over, nil)
var buf bytes.Buffer
if err := png.Encode(&buf, dst); err != nil {
return nil, err
}
return buf.Bytes(), nil
}
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