80 lines
2.0 KiB
Go
80 lines
2.0 KiB
Go
/*
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Copyright (C) 2013 Aaron Lindsay <aaron@aclindsay.com>
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*/
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package main
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import (
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"asink"
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"github.com/howeyc/fsnotify"
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"os"
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"path/filepath"
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"time"
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)
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func StartWatching(watchDir string, fileUpdates chan *asink.Event) {
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watcher, err := fsnotify.NewWatcher()
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if err != nil {
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panic("Failed to create fsnotify watcher")
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}
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//function called by filepath.Walk to start watching a directory and all subdirectories
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watchDirFn := func(path string, info os.FileInfo, err error) error {
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if info.IsDir() {
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err = watcher.Watch(path)
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if err != nil {
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panic("Failed to watch " + path)
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}
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} else if info.Mode().IsRegular() {
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event := new(asink.Event)
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event.Path = path
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event.Type = asink.UPDATE
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event.Timestamp = time.Now().UnixNano()
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fileUpdates <- event
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}
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return nil
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}
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//processes all the fsnotify events into asink events
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go func() {
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for {
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select {
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case ev := <-watcher.Event:
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//if a directory was created, begin recursively watching all its subdirectories
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if fi, err := os.Stat(ev.Name); err == nil && fi.IsDir() {
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if ev.IsCreate() {
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//Note: even though filepath.Walk will visit root, we must watch root first so we catch files/directories created after the walk begins but before this directory begins being watched
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err = watcher.Watch(ev.Name)
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if err != nil {
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panic("Failed to watch " + ev.Name)
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}
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filepath.Walk(ev.Name, watchDirFn)
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//TODO do a scan of this directory so we ensure any file events we missed before starting to watch this directory are caught
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}
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continue
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}
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event := new(asink.Event)
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if ev.IsCreate() || ev.IsModify() {
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event.Type = asink.UPDATE
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} else if ev.IsDelete() || ev.IsRename() {
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event.Type = asink.DELETE
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} else {
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panic("Unknown fsnotify event type")
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}
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event.Path = ev.Name
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event.Timestamp = time.Now().UnixNano()
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fileUpdates <- event
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case err := <-watcher.Error:
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panic(err)
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}
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}
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}()
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//start watching the directory passed in
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filepath.Walk(watchDir, watchDirFn)
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}
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