PiwigoDirectoryUploader/internal/app/images.go

package app

import (
	"git.haefelfinger.net/piwigo/PiwigoDirectoryUploader/internal/pkg/localFileStructure"
	"git.haefelfinger.net/piwigo/PiwigoDirectoryUploader/internal/pkg/piwigo"
	"github.com/sirupsen/logrus"
	"sort"
)

func synchronizeImages(context *appContext, fileSystem map[string]*localFileStructure.FilesystemNode, existingCategories map[string]*piwigo.PiwigoCategory) error {

	// to make use of the new local data store, we have to rethink and refactor the whole local detection process

	// extend the storage of the images to keep track of upload state

	// TBD: How to deal with updates -> delete / upload all based on md5 sums

	// STEP 1 - update and sync local datastore with filesystem
	// - walk through all files of the fileSystem map
	// - get file metadata from filesystem (date, filename, dir, modtime etc.)
	// - recalculate md5 sum if file changed referring to the stored record (reduces load after first calculation a lot)
	// - mark metadata as upload required if changed or new

	// STEP 2 - get file states from piwigo (pwg.images.checkFiles)
	// - get upload status of md5 sum from piwigo for all marked to upload
	// - check if category has to be assigned (image possibly added to two albums -> only uploaded once but assigned multiple times)

	// STEP 3: Upload missing images
	// - upload file in chunks
	// - assign image to category

	imageFiles, err := localFileStructure.GetImageList(fileSystem)
	if err != nil {
		return err
	}

	missingFiles, err := findMissingImages(context, imageFiles)
	if err != nil {
		return err
	}

	err = uploadImages(context, missingFiles, existingCategories)
	if err != nil {
		return err
	}

	logrus.Infof("Synchronized %d files.", len(missingFiles))

	return nil
}

func findMissingImages(context *appContext, imageFiles []*localFileStructure.ImageNode) ([]*localFileStructure.ImageNode, error) {

	logrus.Debugln("Preparing lookuplist for missing files...")

	files := make([]string, 0, len(imageFiles))
	md5map := make(map[string]*localFileStructure.ImageNode, len(imageFiles))
	for _, file := range imageFiles {
		md5map[file.Md5Sum] = file
		files = append(files, file.Md5Sum)
	}

	missingSums, err := piwigo.ImageUploadRequired(context.piwigo, files)
	if err != nil {
		return nil, err
	}

	missingFiles := make([]*localFileStructure.ImageNode, 0, len(missingSums))
	for _, sum := range missingSums {
		file := md5map[sum]
		logrus.Infof("Found missing file %s", file.Path)
		missingFiles = append(missingFiles, file)
	}

	logrus.Infof("Found %d missing files", len(missingFiles))

	return missingFiles, nil
}

func uploadImages(context *appContext, missingFiles []*localFileStructure.ImageNode, existingCategories map[string]*piwigo.PiwigoCategory) error {

	// We sort the files by path to populate per category and not random by file
	sort.Slice(missingFiles, func(i, j int) bool {
		return missingFiles[i].Path < missingFiles[j].Path
	})

	for _, file := range missingFiles {
		categoryId := existingCategories[file.CategoryName].Id

		imageId, err := piwigo.UploadImage(context.piwigo, file.Path, file.Md5Sum, categoryId)
		if err != nil {
			return err
		}
		file.ImageId = imageId
	}

	return nil
}