PiwigoDirectoryUploader/internal/app/images.go

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package app
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import (
"git.haefelfinger.net/piwigo/PiwigoDirectoryUploader/internal/pkg/localFileStructure"
"git.haefelfinger.net/piwigo/PiwigoDirectoryUploader/internal/pkg/piwigo"
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"github.com/sirupsen/logrus"
"path/filepath"
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)
// 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
type fileChecksumCalculator func(filePath string) (string, error)
// Update the local image metadata by walking through all found files and check if the modification date has changed
// or if they are new to the local database. If the files is new or changed, the md5sum will be rebuilt as well.
func synchronizeLocalImageMetadata(metadataStorage ImageMetadataProvider, fileSystemNodes map[string]*localFileStructure.FilesystemNode, categories map[string]*piwigo.PiwigoCategory, checksumCalculator fileChecksumCalculator) error {
logrus.Debugf("Starting synchronizeLocalImageMetadata")
logrus.Info("Synchronizing local image metadata database with local available images")
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for _, file := range fileSystemNodes {
if file.IsDir {
// we are only interested in files not directories
continue
}
metadata, err := metadataStorage.ImageMetadata(file.Path)
if err == ErrorRecordNotFound {
logrus.Debugf("No metadata for %s found. Creating new entry.", file.Key)
metadata = ImageMetaData{}
metadata.Filename = file.Name
metadata.FullImagePath = file.Path
metadata.CategoryPath = filepath.Dir(file.Key)
category, exist := categories[metadata.CategoryPath]
if exist {
metadata.CategoryId = category.Id
} else {
logrus.Warnf("No category found for image %s", file.Path)
}
} else if err != nil {
logrus.Errorf("Could not get metadata due to trouble. Cancelling - %s", err)
return err
}
if metadata.LastChange.Equal(file.ModTime) {
logrus.Infof("No changed detected on file %s -> keeping current state", file.Key)
continue
}
metadata.LastChange = file.ModTime
metadata.UploadRequired = true
metadata.Md5Sum, err = checksumCalculator(file.Path)
if err != nil {
logrus.Warnf("Could not calculate checksum for file %s. Skipping...", file.Path)
continue
}
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err = metadataStorage.SaveImageMetadata(metadata)
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if err != nil {
return err
}
}
logrus.Debugf("Finished synchronizeLocalImageMetadata")
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return nil
}
// Uploads the pending images to the piwigo gallery and assign the category of to the image.
// Update local metadata and set upload flag to false. Also updates the piwigo image id if there was a difference.
func uploadImages(piwigoCtx piwigo.PiwigoImageApi, metadataProvider ImageMetadataProvider) error {
logrus.Debugf("Starting uploadImages")
images, err := metadataProvider.ImageMetadataToUpload()
if err != nil {
return err
}
logrus.Infof("Uploading %d images to piwigo", len(images))
for _, img := range images {
imgId, err := piwigoCtx.UploadImage(img.PiwigoId, img.FullImagePath, img.Md5Sum, img.CategoryId)
if err != nil {
logrus.Warnf("could not upload image %s. Continuing with the next image.", img.FullImagePath)
continue
}
if imgId > 0 && imgId != img.PiwigoId {
img.PiwigoId = imgId
logrus.Debugf("Updating image %d with piwigo id %d", img.ImageId, img.PiwigoId)
}
logrus.Infof("Successfully uploaded %s", img.FullImagePath)
img.UploadRequired = false
err = metadataProvider.SaveImageMetadata(img)
if err != nil {
logrus.Warnf("could not save uploaded image %s. Continuing with the next image.", img.FullImagePath)
continue
}
}
logrus.Debugf("Finished uploadImages successfully")
return nil
}
// This method aggregates the check for files with missing piwigoids and if changed files need to be uploaded again.
func synchronizePiwigoMetadata(piwigoCtx piwigo.PiwigoImageApi, metadataProvider ImageMetadataProvider) error {
// TODO: check if category has to be assigned (image possibly added to two albums -> only uploaded once but assigned multiple times) -> implement later
logrus.Debugf("Starting synchronizePiwigoMetadata")
err := updatePiwigoIdIfAlreadyUploaded(metadataProvider, piwigoCtx)
if err != nil {
return err
}
err = checkPiwigoForChangedImages(metadataProvider, piwigoCtx)
if err != nil {
return err
}
return nil
}
// Check all images with upload required if they are really changed and need to be uploaded to the server.
func checkPiwigoForChangedImages(provider ImageMetadataProvider, piwigoCtx piwigo.PiwigoImageApi) error {
logrus.Infof("Checking pending files if they really differ from the version in piwigo...")
images, err := provider.ImageMetadataToUpload()
if err != nil {
return err
}
if len(images) == 0 {
logrus.Info("There are no existing images to check for modification on the server.")
return nil
}
for _, img := range images {
if img.PiwigoId == 0 {
continue
}
state, err := piwigoCtx.ImageCheckFile(img.PiwigoId, img.Md5Sum)
if err != nil {
logrus.Warnf("Error during file change check of file %s", img.FullImagePath)
continue
}
if state == piwigo.ImageStateUptodate {
logrus.Debugf("File %s - %d has not changed", img.FullImagePath, img.PiwigoId)
img.UploadRequired = false
err = provider.SaveImageMetadata(img)
if err != nil {
logrus.Warnf("Could not save image data of image %s", img.FullImagePath)
}
}
}
return nil
}
// This function calls piwigo and checks if the given md5sum is already present.
// Only files without a piwigo id are used to query the server.
func updatePiwigoIdIfAlreadyUploaded(provider ImageMetadataProvider, piwigoCtx piwigo.PiwigoImageApi) error {
logrus.Infof("checking for pending files that are already on piwigo and updating piwigoids...")
images, err := provider.ImageMetadataToUpload()
if err != nil {
return err
}
if len(images) == 0 {
logrus.Info("There are no existing images to check for modification on the server.")
return nil
}
logrus.Debugln("Preparing lookuplist for missing piwigo ids...")
files := make([]string, 0, len(images))
for _, img := range images {
if img.PiwigoId == 0 {
files = append(files, img.Md5Sum)
}
}
missingResults, err := piwigoCtx.ImagesExistOnPiwigo(files)
if err != nil {
return err
}
for md5sum, piwigoId := range missingResults {
logrus.Debugf("Setting piwigo id of %s to %d", md5sum, piwigoId)
err = provider.SavePiwigoIdAndUpdateUploadFlag(md5sum, piwigoId)
if err != nil {
logrus.Warnf("Could not save piwigo id %d for file %s", piwigoId, md5sum)
}
}
return nil
}