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lib.go
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lib.go
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/*
Copyright AppsCode Inc. and Contributors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package fsnotify
import (
"path/filepath"
"sync/atomic"
"github.com/fsnotify/fsnotify"
"github.com/pkg/errors"
"k8s.io/klog/v2"
)
type Watcher struct {
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 {
watcher, err := fsnotify.NewWatcher()
if err != nil {
return err
}
go func() {
<-stopCh
defer watcher.Close()
}()
go func() {
for {
select {
case <-stopCh:
return
case event := <-watcher.Events:
klog.V(8).Infoln("file watcher event: --------------------------------------", event)
filename := filepath.Clean(event.Name)
if filename == filepath.Join(w.WatchDir, "..data") && event.Op == fsnotify.Create {
if err := w.Reload(); err != nil {
klog.Errorf("error[%s]: %s", filename, err)
} else {
w.incReloadCount(filename)
}
}
case err := <-watcher.Errors:
klog.Errorln("error:", err)
}
}
}()
if err = watcher.Add(w.WatchDir); err != nil {
return errors.Errorf("error watching dir %s. Reason: %s", w.WatchDir, err)
}
return nil
}