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watcher.go
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watcher.go
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package watcher
import (
"errors"
"github.com/fsnotify/fsnotify"
"github.com/wittano/filebot/file"
"github.com/wittano/filebot/setting"
"os"
"sync"
"time"
)
var mutex sync.Mutex
type MyWatcher struct {
*fsnotify.Watcher
blocker chan bool
fileObserved map[string]string
}
func NewWatcher() MyWatcher {
w, err := fsnotify.NewWatcher()
if err != nil {
setting.Logger().Fatal("Failed initialized system file watcher", err)
}
blocker := make(chan bool)
return MyWatcher{
w,
blocker,
make(map[string]string),
}
}
func (w MyWatcher) ObserveFiles() {
for {
select {
case e, ok := <-w.Events:
if !ok {
w.blocker <- false
return
}
if e.Has(fsnotify.Create) || e.Has(fsnotify.Rename) {
if dir, ok := w.fileObserved[e.Name]; ok {
file.MoveToDestination(dir, e.Name)
}
}
case err, ok := <-w.Errors:
if !ok {
w.blocker <- false
return
}
setting.Logger().Error("Watcher got unexpected error", err)
}
}
}
func (w MyWatcher) WaitForEvents() {
if ok := <-w.blocker; !ok {
return
}
}
func (w *MyWatcher) AddFilesToObservable(config setting.Config) {
for _, dir := range config.Dirs {
paths, err := dir.RealPaths()
if err != nil {
setting.Logger().Error("Failed to get path for files", err)
continue
}
if paths != nil {
destPath := dir.Dest
if dir.Dest == "" {
destPath, err = dir.TrashDir()
}
if err != nil {
setting.Logger().Error("Failed to find trash directory", err)
break
}
go w.fillFileObservedMap(paths, destPath)
w.addFilesToObservable(paths...)
go file.MoveToDestination(destPath, paths...)
}
}
}
func (w *MyWatcher) fillFileObservedMap(src []string, dest string) {
for _, p := range src {
mutex.Lock()
w.fileObserved[p] = dest
mutex.Unlock()
}
}
func (w *MyWatcher) addFilesToObservable(paths ...string) {
for _, p := range paths {
if err := w.Add(p); err != nil {
setting.Logger().Errorf("Cannot add %s file/directory to tracing list", err, p)
}
}
}
func (w *MyWatcher) UpdateObservableFileList() {
var wg sync.WaitGroup
conf := setting.Flags.Config()
timer := time.NewTicker(setting.Flags.UpdateInterval)
defer timer.Stop()
for {
wg.Add(2)
<-timer.C
go w.removeUnnecessaryFiles(&wg)
go func(wg *sync.WaitGroup) {
w.AddFilesToObservable(*conf)
wg.Done()
}(&wg)
wg.Wait()
}
}
func (w *MyWatcher) removeUnnecessaryFiles(wg *sync.WaitGroup) {
defer wg.Done()
for _, path := range w.WatchList() {
if _, err := os.Stat(path); errors.Is(err, os.ErrNotExist) {
w.Remove(path)
}
}
}