micro/config/source/file/watcher_linux.go

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//+build linux
package file
import (
"os"
"reflect"
"github.com/fsnotify/fsnotify"
"github.com/micro/go-micro/v3/config/source"
)
type watcher struct {
f *file
fw *fsnotify.Watcher
exit chan bool
}
func newWatcher(f *file) (source.Watcher, error) {
fw, err := fsnotify.NewWatcher()
if err != nil {
return nil, err
}
fw.Add(f.path)
return &watcher{
f: f,
fw: fw,
exit: make(chan bool),
}, nil
}
func (w *watcher) Next() (*source.ChangeSet, error) {
// is it closed?
select {
case <-w.exit:
return nil, source.ErrWatcherStopped
default:
}
for {
// try get the event
select {
case event, _ := <-w.fw.Events:
if event.Op == fsnotify.Rename {
// check existence of file, and add watch again
_, err := os.Stat(event.Name)
if err == nil || os.IsExist(err) {
w.fw.Add(event.Name)
}
}
c, err := w.f.Read()
if err != nil {
return nil, err
}
// ARCH: Linux centos-7.shared 3.10.0-693.5.2.el7.x86_64
// Sometimes, ioutil.WriteFile triggers multiple fsnotify.Write events, which may be a bug.
// Detect if the file has changed
if reflect.DeepEqual(c.Data, w.f.data) {
continue
}
w.f.data = c.Data
return c, nil
case err := <-w.fw.Errors:
return nil, err
case <-w.exit:
return nil, source.ErrWatcherStopped
}
}
}
func (w *watcher) Stop() error {
return w.fw.Close()
}