mirror of
https://github.com/matrix-org/dendrite
synced 2024-11-05 15:39:26 +01:00
248 lines
7.2 KiB
Go
248 lines
7.2 KiB
Go
// Copyright 2017 Vector Creations Ltd
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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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//
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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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// +build bimg
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package thumbnailer
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import (
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"context"
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"os"
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"time"
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"github.com/matrix-org/dendrite/common/config"
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"github.com/matrix-org/dendrite/mediaapi/storage"
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"github.com/matrix-org/dendrite/mediaapi/types"
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log "github.com/sirupsen/logrus"
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"gopkg.in/h2non/bimg.v1"
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)
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// GenerateThumbnails generates the configured thumbnail sizes for the source file
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func GenerateThumbnails(
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ctx context.Context,
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src types.Path,
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configs []config.ThumbnailSize,
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mediaMetadata *types.MediaMetadata,
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activeThumbnailGeneration *types.ActiveThumbnailGeneration,
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maxThumbnailGenerators int,
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db *storage.Database,
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logger *log.Entry,
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) (busy bool, errorReturn error) {
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buffer, err := bimg.Read(string(src))
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if err != nil {
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logger.WithError(err).WithField("src", src).Error("Failed to read src file")
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return false, err
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}
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img := bimg.NewImage(buffer)
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for _, config := range configs {
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// Note: createThumbnail does locking based on activeThumbnailGeneration
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busy, err = createThumbnail(
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ctx, src, img, config, mediaMetadata, activeThumbnailGeneration,
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maxThumbnailGenerators, db, logger,
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)
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if err != nil {
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logger.WithError(err).WithField("src", src).Error("Failed to generate thumbnails")
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return false, err
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}
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if busy {
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return true, nil
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}
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}
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return false, nil
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}
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// GenerateThumbnail generates the configured thumbnail size for the source file
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func GenerateThumbnail(
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ctx context.Context,
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src types.Path,
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config types.ThumbnailSize,
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mediaMetadata *types.MediaMetadata,
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activeThumbnailGeneration *types.ActiveThumbnailGeneration,
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maxThumbnailGenerators int,
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db *storage.Database,
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logger *log.Entry,
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) (busy bool, errorReturn error) {
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buffer, err := bimg.Read(string(src))
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if err != nil {
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logger.WithError(err).WithFields(log.Fields{
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"src": src,
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}).Error("Failed to read src file")
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return false, err
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}
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img := bimg.NewImage(buffer)
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// Note: createThumbnail does locking based on activeThumbnailGeneration
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busy, err = createThumbnail(
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ctx, src, img, config, mediaMetadata, activeThumbnailGeneration,
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maxThumbnailGenerators, db, logger,
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)
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if err != nil {
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logger.WithError(err).WithFields(log.Fields{
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"src": src,
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}).Error("Failed to generate thumbnails")
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return false, err
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}
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if busy {
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return true, nil
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}
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return false, nil
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}
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// createThumbnail checks if the thumbnail exists, and if not, generates it
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// Thumbnail generation is only done once for each non-existing thumbnail.
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func createThumbnail(
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ctx context.Context,
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src types.Path,
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img *bimg.Image,
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config types.ThumbnailSize,
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mediaMetadata *types.MediaMetadata,
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activeThumbnailGeneration *types.ActiveThumbnailGeneration,
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maxThumbnailGenerators int,
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db *storage.Database,
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logger *log.Entry,
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) (busy bool, errorReturn error) {
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logger = logger.WithFields(log.Fields{
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"Width": config.Width,
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"Height": config.Height,
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"ResizeMethod": config.ResizeMethod,
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})
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// Check if request is larger than original
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if isLargerThanOriginal(config, img) {
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return false, nil
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}
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dst := GetThumbnailPath(src, config)
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// Note: getActiveThumbnailGeneration uses mutexes and conditions from activeThumbnailGeneration
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isActive, busy, err := getActiveThumbnailGeneration(dst, config, activeThumbnailGeneration, maxThumbnailGenerators, logger)
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if err != nil {
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return false, err
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}
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if busy {
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return true, nil
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}
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if isActive {
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// Note: This is an active request that MUST broadcastGeneration to wake up waiting goroutines!
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// Note: broadcastGeneration uses mutexes and conditions from activeThumbnailGeneration
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defer func() {
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// Note: errorReturn is the named return variable so we wrap this in a closure to re-evaluate the arguments at defer-time
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if err := recover(); err != nil {
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broadcastGeneration(dst, activeThumbnailGeneration, config, err.(error), logger)
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panic(err)
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}
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broadcastGeneration(dst, activeThumbnailGeneration, config, errorReturn, logger)
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}()
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}
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exists, err := isThumbnailExists(ctx, dst, config, mediaMetadata, db, logger)
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if err != nil || exists {
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return false, err
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}
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start := time.Now()
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width, height, err := resize(dst, img, config.Width, config.Height, config.ResizeMethod == "crop", logger)
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if err != nil {
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return false, err
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}
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logger.WithFields(log.Fields{
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"ActualWidth": width,
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"ActualHeight": height,
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"processTime": time.Now().Sub(start),
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}).Info("Generated thumbnail")
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stat, err := os.Stat(string(dst))
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if err != nil {
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return false, err
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}
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thumbnailMetadata := &types.ThumbnailMetadata{
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MediaMetadata: &types.MediaMetadata{
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MediaID: mediaMetadata.MediaID,
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Origin: mediaMetadata.Origin,
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// Note: the code currently always creates a JPEG thumbnail
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ContentType: types.ContentType("image/jpeg"),
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FileSizeBytes: types.FileSizeBytes(stat.Size()),
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},
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ThumbnailSize: types.ThumbnailSize{
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Width: config.Width,
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Height: config.Height,
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ResizeMethod: config.ResizeMethod,
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},
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}
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err = db.StoreThumbnail(ctx, thumbnailMetadata)
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if err != nil {
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logger.WithError(err).WithFields(log.Fields{
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"ActualWidth": width,
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"ActualHeight": height,
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}).Error("Failed to store thumbnail metadata in database.")
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return false, err
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}
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return false, nil
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}
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func isLargerThanOriginal(config types.ThumbnailSize, img *bimg.Image) bool {
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imgSize, err := img.Size()
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if err == nil && config.Width >= imgSize.Width && config.Height >= imgSize.Height {
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return true
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}
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return false
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}
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// resize scales an image to fit within the provided width and height
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// If the source aspect ratio is different to the target dimensions, one edge will be smaller than requested
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// If crop is set to true, the image will be scaled to fill the width and height with any excess being cropped off
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func resize(dst types.Path, inImage *bimg.Image, w, h int, crop bool, logger *log.Entry) (int, int, error) {
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inSize, err := inImage.Size()
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if err != nil {
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return -1, -1, err
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}
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options := bimg.Options{
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Type: bimg.JPEG,
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Quality: 85,
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}
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if crop {
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options.Width = w
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options.Height = h
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options.Crop = true
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} else {
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inAR := float64(inSize.Width) / float64(inSize.Height)
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outAR := float64(w) / float64(h)
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if inAR > outAR {
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// input has wider AR than requested output so use requested width and calculate height to match input AR
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options.Width = w
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options.Height = int(float64(w) / inAR)
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} else {
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// input has narrower AR than requested output so use requested height and calculate width to match input AR
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options.Width = int(float64(h) * inAR)
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options.Height = h
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}
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}
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newImage, err := inImage.Process(options)
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if err != nil {
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return -1, -1, err
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}
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if err = bimg.Write(string(dst), newImage); err != nil {
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logger.WithError(err).Error("Failed to resize image")
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return -1, -1, err
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}
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return options.Width, options.Height, nil
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}
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