125 lines
2.7 KiB
Go
125 lines
2.7 KiB
Go
package scanner
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import (
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"os"
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"path"
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"strings"
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"time"
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"github.com/deluan/navidrome/log"
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)
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type dirInfo struct {
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mdate time.Time
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maybe bool
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}
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type dirInfoMap map[string]dirInfo
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type ChangeDetector struct {
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rootFolder string
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dirMap dirInfoMap
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}
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func NewChangeDetector(rootFolder string) *ChangeDetector {
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return &ChangeDetector{
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rootFolder: rootFolder,
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dirMap: dirInfoMap{},
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}
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}
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func (s *ChangeDetector) Scan(lastModifiedSince time.Time) (changed []string, deleted []string, err error) {
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start := time.Now()
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newMap := make(dirInfoMap)
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err = s.loadMap(newMap, s.rootFolder, lastModifiedSince, false)
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if err != nil {
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return
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}
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changed, deleted, err = s.checkForUpdates(lastModifiedSince, newMap)
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if err != nil {
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return
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}
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elapsed := time.Since(start)
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log.Trace("Folder analysis complete\n", "total", len(newMap), "changed", len(changed), "deleted", len(deleted), "elapsed", elapsed)
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s.dirMap = newMap
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return
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}
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func (s *ChangeDetector) loadDir(dirPath string) (children []string, lastUpdated time.Time, err error) {
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dir, err := os.Open(dirPath)
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defer dir.Close()
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if err != nil {
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return
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}
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dirInfo, err := os.Stat(dirPath)
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if err != nil {
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return
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}
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lastUpdated = dirInfo.ModTime()
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files, err := dir.Readdir(-1)
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if err != nil {
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return
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}
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for _, f := range files {
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if f.IsDir() {
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children = append(children, path.Join(dirPath, f.Name()))
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} else {
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if f.ModTime().After(lastUpdated) {
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lastUpdated = f.ModTime()
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}
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}
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}
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return
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}
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func (s *ChangeDetector) loadMap(dirMap dirInfoMap, rootPath string, since time.Time, maybe bool) error {
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children, lastUpdated, err := s.loadDir(rootPath)
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if err != nil {
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return err
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}
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maybe = maybe || lastUpdated.After(since)
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for _, c := range children {
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err := s.loadMap(dirMap, c, since, maybe)
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if err != nil {
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return err
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}
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}
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dir := s.getRelativePath(rootPath)
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dirMap[dir] = dirInfo{mdate: lastUpdated, maybe: maybe}
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return nil
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}
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func (s *ChangeDetector) getRelativePath(subfolder string) string {
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dir := strings.TrimPrefix(subfolder, s.rootFolder)
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if dir == "" {
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dir = "."
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}
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return dir
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}
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func (s *ChangeDetector) checkForUpdates(lastModifiedSince time.Time, newMap dirInfoMap) (changed []string, deleted []string, err error) {
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for dir, newEntry := range newMap {
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lastUpdated := newEntry.mdate
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oldLastUpdated := lastModifiedSince
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if oldEntry, ok := s.dirMap[dir]; ok {
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oldLastUpdated = oldEntry.mdate
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} else {
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if newEntry.maybe {
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oldLastUpdated = time.Time{}
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}
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}
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if lastUpdated.After(oldLastUpdated) {
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changed = append(changed, dir)
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}
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}
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for dir := range s.dirMap {
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if _, ok := newMap[dir]; !ok {
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deleted = append(deleted, dir)
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}
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}
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return
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}
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