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watcher.go
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watcher.go
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// Copyright Steve Sloka 2021
//
// 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 watcher
import (
"log"
"github.com/fsnotify/fsnotify"
)
type OperationType int
const (
Create OperationType = iota
Remove
Modify
)
type NotifyMessage struct {
Operation OperationType
FilePath string
}
func Watch(directory string, notifyCh chan<- NotifyMessage) {
watcher, err := fsnotify.NewWatcher()
if err != nil {
log.Fatal(err)
}
defer watcher.Close()
done := make(chan bool)
go func() {
for {
select {
case event, ok := <-watcher.Events:
if !ok {
return
}
if event.Op&fsnotify.Write == fsnotify.Write {
notifyCh <- NotifyMessage{
Operation: Modify,
FilePath: event.Name,
}
} else if event.Op&fsnotify.Create == fsnotify.Create {
notifyCh <- NotifyMessage{
Operation: Create,
FilePath: event.Name,
}
} else if event.Op&fsnotify.Remove == fsnotify.Remove {
notifyCh <- NotifyMessage{
Operation: Remove,
FilePath: event.Name,
}
}
case err, ok := <-watcher.Errors:
if !ok {
return
}
log.Println("error:", err)
}
}
}()
err = watcher.Add(directory)
if err != nil {
log.Fatal(err)
}
<-done
}