/
watcher.go
81 lines (69 loc) · 1.67 KB
/
watcher.go
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package ioutil
import (
"fmt"
"path/filepath"
"sync/atomic"
"github.com/fsnotify/fsnotify"
"gomodules.xyz/sets"
"k8s.io/klog/v2"
)
type Watcher struct {
WatchFiles []string
WatchDir string
Reload func() error
reloadCount uint64
}
func (w *Watcher) incReloadCount(filename string) {
atomic.AddUint64(&w.reloadCount, 1)
klog.Infof("file %s reloaded: %d", filename, atomic.LoadUint64(&w.reloadCount))
}
func (w *Watcher) Run(stopCh <-chan struct{}) error {
fileset := sets.NewString(w.WatchFiles...)
watcher, err := fsnotify.NewWatcher()
if err != nil {
return err
}
go func() {
<-stopCh
defer watcher.Close()
}()
go func() {
for {
select {
case event := <-watcher.Events:
klog.Infoln("file watcher event: --------------------------------------", event)
filename := filepath.Clean(event.Name)
if !fileset.Has(filename) {
continue
}
switch event.Op {
case fsnotify.Create:
if err = watcher.Add(filename); err != nil {
klog.Errorln("error:", err)
}
case fsnotify.Write:
if err := w.Reload(); err != nil {
klog.Errorln(err)
} else {
w.incReloadCount(filename)
}
case fsnotify.Remove, fsnotify.Rename:
if err = watcher.Remove(filename); err != nil {
klog.Errorln("error:", err)
}
}
case err := <-watcher.Errors:
klog.Errorln("error:", err)
}
}
}()
for _, filename := range w.WatchFiles {
if err = watcher.Add(filename); err != nil {
klog.Errorf("error watching file %s. Reason: %s", filename, err)
}
}
if err = watcher.Add(w.WatchDir); err != nil {
return fmt.Errorf("error watching dir %s. Reason: %s", w.WatchDir, err)
}
return nil
}