108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
package localFileStructure
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import (
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"github.com/sirupsen/logrus"
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"path/filepath"
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"runtime"
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"sync"
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"time"
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)
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func GetImageList(fileSystem map[string]*FilesystemNode) ([]*ImageNode, error) {
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logrus.Debugln("Starting GetImageList to prepare local image metadata.")
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imageFiles := make([]*ImageNode, 0, len(fileSystem))
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finished := make(chan bool, 1)
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errChannel := make(chan error, 1)
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queue := make(chan *FilesystemNode, 100)
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results := make(chan *ImageNode, 200)
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waitGroup := sync.WaitGroup{}
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go resultCollector(results, &imageFiles)
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waitGroup.Add(1)
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go queueProducer(fileSystem, queue, &waitGroup)
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numberOfCPUs := runtime.NumCPU()
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for i := 0; i < numberOfCPUs; i++ {
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logrus.Tracef("Starting getImageNodeWorker number %d", i)
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waitGroup.Add(1)
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go getImageNodeWorker(queue, results, errChannel, &waitGroup)
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}
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go func() {
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waitGroup.Wait()
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logrus.Debugln("All workers finished processing, closing channels.")
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close(results)
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close(finished)
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}()
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select {
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case <-finished:
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case err := <-errChannel:
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if err != nil {
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logrus.Errorf("Error during local image processing: %S", err)
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return nil, err
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}
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}
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logrus.Infof("Found %d local images to process", len(imageFiles))
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return imageFiles, nil
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}
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func queueProducer(fileSystem map[string]*FilesystemNode, queue chan *FilesystemNode, waitGroup *sync.WaitGroup) {
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logrus.Debugln("Starting queueProducer to fill the queue of the files to check and calculate the checksum")
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for _, file := range fileSystem {
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if file.IsDir {
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continue
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}
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queue <- file
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}
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// after the last item is in the queue, we close it as there will be no more and we like
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// the workers to exit.
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close(queue)
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logrus.Debugln("Finished queueProducer")
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waitGroup.Done()
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}
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func resultCollector(results chan *ImageNode, imageFiles *[]*ImageNode) {
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logrus.Debugln("Starting image node result collector")
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for imageNode := range results {
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logrus.Debugf("Local Image prepared - %s - %s - %s", imageNode.Md5Sum, imageNode.ModTime.Format(time.RFC3339), imageNode.Path)
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*imageFiles = append(*imageFiles, imageNode)
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}
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logrus.Debugln("Finished resultCollector")
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}
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func getImageNodeWorker(queue chan *FilesystemNode, results chan *ImageNode, errChannel chan error, waitGroup *sync.WaitGroup) {
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logrus.Debugln("Starting image file worker to gather local image informations")
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for file := range queue {
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md5sum, err := calculateFileCheckSums(file.Path)
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if err != nil {
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errChannel <- err
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// we try the next image in the queue, as this might be just one error
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continue
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}
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imageNode := &ImageNode{
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Path: file.Path,
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CategoryName: filepath.Dir(file.Key),
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ModTime: file.ModTime,
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Md5Sum: md5sum,
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}
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results <- imageNode
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}
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logrus.Debugln("Finished getImageNodeWorker")
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waitGroup.Done()
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}
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