mirror of https://github.com/k3s-io/k3s
90 lines
2.3 KiB
Go
90 lines
2.3 KiB
Go
/*
|
|
Copyright 2017 The Kubernetes Authors.
|
|
|
|
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 filesystem
|
|
|
|
import (
|
|
"github.com/fsnotify/fsnotify"
|
|
)
|
|
|
|
// FSWatcher is a callback-based filesystem watcher abstraction for fsnotify.
|
|
type FSWatcher interface {
|
|
// Initializes the watcher with the given watch handlers.
|
|
// Called before all other methods.
|
|
Init(FSEventHandler, FSErrorHandler) error
|
|
|
|
// Starts listening for events and errors.
|
|
// When an event or error occurs, the corresponding handler is called.
|
|
Run()
|
|
|
|
// Add a filesystem path to watch
|
|
AddWatch(path string) error
|
|
}
|
|
|
|
// FSEventHandler is called when a fsnotify event occurs.
|
|
type FSEventHandler func(event fsnotify.Event)
|
|
|
|
// FSErrorHandler is called when a fsnotify error occurs.
|
|
type FSErrorHandler func(err error)
|
|
|
|
type fsnotifyWatcher struct {
|
|
watcher *fsnotify.Watcher
|
|
eventHandler FSEventHandler
|
|
errorHandler FSErrorHandler
|
|
}
|
|
|
|
var _ FSWatcher = &fsnotifyWatcher{}
|
|
|
|
// NewFsnotifyWatcher returns an implementation of FSWatcher that continuously listens for
|
|
// fsnotify events and calls the event handler as soon as an event is received.
|
|
func NewFsnotifyWatcher() FSWatcher {
|
|
return &fsnotifyWatcher{}
|
|
}
|
|
|
|
func (w *fsnotifyWatcher) AddWatch(path string) error {
|
|
return w.watcher.Add(path)
|
|
}
|
|
|
|
func (w *fsnotifyWatcher) Init(eventHandler FSEventHandler, errorHandler FSErrorHandler) error {
|
|
var err error
|
|
w.watcher, err = fsnotify.NewWatcher()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
w.eventHandler = eventHandler
|
|
w.errorHandler = errorHandler
|
|
return nil
|
|
}
|
|
|
|
func (w *fsnotifyWatcher) Run() {
|
|
go func() {
|
|
defer w.watcher.Close()
|
|
for {
|
|
select {
|
|
case event := <-w.watcher.Events:
|
|
if w.eventHandler != nil {
|
|
w.eventHandler(event)
|
|
}
|
|
case err := <-w.watcher.Errors:
|
|
if w.errorHandler != nil {
|
|
w.errorHandler(err)
|
|
}
|
|
}
|
|
}
|
|
}()
|
|
}
|