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watcher.go
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watcher.go
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// Copyright 2016--2022 Lightbits Labs Ltd.
//
// 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 clientconfig
import (
"context"
"github.com/fsnotify/fsnotify"
"github.com/sirupsen/logrus"
)
type EventOp string
var (
Create EventOp = "Create"
Remove EventOp = "Remove"
Modify EventOp = "Modify"
Rename EventOp = "Rename"
Chmod EventOp = "Chmod"
)
type Event struct {
Name string
Op EventOp
}
type FileWatcher struct {
watcher *fsnotify.Watcher
}
func (w *FileWatcher) Watch(ctx context.Context, path string) (<-chan *Event, error) {
var err error
w.watcher, err = fsnotify.NewWatcher()
if err != nil {
logrus.WithError(err).Errorf("failed to create watcher")
}
err = w.watcher.Add(path)
if err != nil {
logrus.WithError(err).Errorf("failed to open %q", path)
return nil, err
}
ch := make(chan *Event)
go func() {
defer w.watcher.Close()
for {
select {
case event, ok := <-w.watcher.Events:
if !ok {
return
}
e := &Event{
Name: event.Name,
}
if event.Op&fsnotify.Create == fsnotify.Create {
e.Op = Create
} else if event.Op&fsnotify.Write == fsnotify.Write {
e.Op = Modify
} else if event.Op&fsnotify.Remove == fsnotify.Remove {
e.Op = Remove
} else if event.Op&fsnotify.Rename == fsnotify.Rename {
e.Op = Rename
} else if event.Op&fsnotify.Chmod == fsnotify.Chmod {
e.Op = Chmod
}
ch <- e
case err, ok := <-w.watcher.Errors:
if !ok {
return
}
logrus.WithError(err).Errorf("ifnotify error")
case <-ctx.Done():
break
}
}
}()
return ch, nil
}