Restructure go project (#2356)

* Move main to cmd
* Move api to internal
* Move logger and manager to internal
* Move shell hiding code to separate package
* Decouple job from desktop and utils
* Decouple session from config
* Move static into internal
* Decouple config from dlna
* Move desktop to internal
* Move dlna to internal
* Decouple remaining packages from config
* Move config into internal
* Move jsonschema and paths to models
* Make ffmpeg functions private
* Move file utility methods into fsutil package
* Move symwalk into fsutil
* Move single-use util functions into client package
* Move slice functions to separate packages
* Add env var to suppress windowsgui arg
* Move hash functions into separate package
* Move identify to internal
* Move autotag to internal
* Touch UI when generating backend

internal/manager/task_generate_preview.go

@@ -0,0 +1,96 @@
+package manager
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/stashapp/stash/internal/manager/config"
+	"github.com/stashapp/stash/pkg/fsutil"
+	"github.com/stashapp/stash/pkg/logger"
+	"github.com/stashapp/stash/pkg/models"
+)
+
+type GeneratePreviewTask struct {
+	Scene        models.Scene
+	ImagePreview bool
+
+	Options models.GeneratePreviewOptionsInput
+
+	Overwrite           bool
+	fileNamingAlgorithm models.HashAlgorithm
+}
+
+func (t *GeneratePreviewTask) GetDescription() string {
+	return fmt.Sprintf("Generating preview for %s", t.Scene.Path)
+}
+
+func (t *GeneratePreviewTask) Start(ctx context.Context) {
+	videoFilename := t.videoFilename()
+	videoChecksum := t.Scene.GetHash(t.fileNamingAlgorithm)
+	imageFilename := t.imageFilename()
+
+	if !t.Overwrite && !t.required() {
+		return
+	}
+
+	ffprobe := instance.FFProbe
+	videoFile, err := ffprobe.NewVideoFile(t.Scene.Path, false)
+	if err != nil {
+		logger.Errorf("error reading video file: %s", err.Error())
+		return
+	}
+
+	const generateVideo = true
+	generator, err := NewPreviewGenerator(*videoFile, videoChecksum, videoFilename, imageFilename, instance.Paths.Generated.Screenshots, generateVideo, t.ImagePreview, t.Options.PreviewPreset.String())
+
+	if err != nil {
+		logger.Errorf("error creating preview generator: %s", err.Error())
+		return
+	}
+	generator.Overwrite = t.Overwrite
+
+	// set the preview generation configuration from the global config
+	generator.Info.ChunkCount = *t.Options.PreviewSegments
+	generator.Info.ChunkDuration = *t.Options.PreviewSegmentDuration
+	generator.Info.ExcludeStart = *t.Options.PreviewExcludeStart
+	generator.Info.ExcludeEnd = *t.Options.PreviewExcludeEnd
+	generator.Info.Audio = config.GetInstance().GetPreviewAudio()
+
+	if err := generator.Generate(); err != nil {
+		logger.Errorf("error generating preview: %s", err.Error())
+		return
+	}
+}
+
+func (t GeneratePreviewTask) required() bool {
+	sceneHash := t.Scene.GetHash(t.fileNamingAlgorithm)
+	videoExists := t.doesVideoPreviewExist(sceneHash)
+	imageExists := !t.ImagePreview || t.doesImagePreviewExist(sceneHash)
+	return !imageExists || !videoExists
+}
+
+func (t *GeneratePreviewTask) doesVideoPreviewExist(sceneChecksum string) bool {
+	if sceneChecksum == "" {
+		return false
+	}
+
+	videoExists, _ := fsutil.FileExists(instance.Paths.Scene.GetStreamPreviewPath(sceneChecksum))
+	return videoExists
+}
+
+func (t *GeneratePreviewTask) doesImagePreviewExist(sceneChecksum string) bool {
+	if sceneChecksum == "" {
+		return false
+	}
+
+	imageExists, _ := fsutil.FileExists(instance.Paths.Scene.GetStreamPreviewImagePath(sceneChecksum))
+	return imageExists
+}
+
+func (t *GeneratePreviewTask) videoFilename() string {
+	return t.Scene.GetHash(t.fileNamingAlgorithm) + ".mp4"
+}
+
+func (t *GeneratePreviewTask) imageFilename() string {
+	return t.Scene.GetHash(t.fileNamingAlgorithm) + ".webp"
+}