116 lines
1.9 KiB
Go
116 lines
1.9 KiB
Go
package gonotify
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import (
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"context"
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"path/filepath"
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"sync"
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)
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// FileWatcher waits for events generated by filesystem for a specific list of file paths, including
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// IN_CREATE for not yet existing files and IN_DELETE for removed.
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type FileWatcher struct {
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C chan FileEvent
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done chan struct{}
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}
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// NewFileWatcher creates FileWatcher with provided inotify mask and list of files to wait events for.
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func NewFileWatcher(ctx context.Context, mask uint32, files ...string) (*FileWatcher, error) {
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f := &FileWatcher{
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C: make(chan FileEvent),
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done: make(chan struct{}),
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}
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inotify, err := NewInotify(ctx)
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if err != nil {
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return nil, err
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}
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expectedPaths := make(map[string]bool)
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for _, file := range files {
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_, err := inotify.AddWatch(filepath.Dir(file), mask)
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if err != nil {
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return nil, err
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}
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expectedPaths[file] = true
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}
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events := make(chan FileEvent)
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wg := sync.WaitGroup{}
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wg.Add(1)
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go func() {
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defer wg.Done()
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for {
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select {
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case <-ctx.Done():
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close(events)
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return
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default:
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}
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raw, err := inotify.Read()
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if err != nil {
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close(events)
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return
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}
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for _, event := range raw {
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select {
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case <-ctx.Done():
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return
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case events <- FileEvent{
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InotifyEvent: event,
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}: //noop
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}
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}
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}
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}()
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wg.Add(1)
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go func() {
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defer wg.Done()
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defer close(f.C)
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for {
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select {
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case <-ctx.Done():
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return
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case event, ok := <-events:
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if !ok {
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select {
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case <-ctx.Done():
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case f.C <- FileEvent{Eof: true}:
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}
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return
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}
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if !expectedPaths[event.Name] {
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continue
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}
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select {
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case <-ctx.Done():
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return
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case f.C <- event:
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}
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}
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}
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}()
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go func() {
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<-inotify.Done()
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wg.Wait()
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close(f.done)
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}()
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return f, nil
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}
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// Done returns a channel that is closed when the FileWatcher is done.
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func (f *FileWatcher) Done() <-chan struct{} {
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return f.done
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}
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