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fileWatcher.go
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/
fileWatcher.go
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package core
import (
"fmt"
"github.com/fsnotify/fsnotify"
"log"
"os"
"path/filepath"
"time"
)
//
// FsWatcher watches for filesystem changes and notify it's subscribers
//
type FsWatcher struct {
Subscribers map[int][]Runner
watcher *fsnotify.Watcher
}
//
// Subscribe subscribes an event listener to file watcher.
//
func (f *FsWatcher) Subscribe(runner Runner) {
for _, ev := range runner.HandledEvents() {
f.Subscribers[ev] = append(f.Subscribers[ev], runner)
}
}
//
// notifySubscribers notifies all subscribed listeners when an event occurs.
//
func (f *FsWatcher) notifySubscribers(eventOp fsnotify.Op, event fsnotify.Event) {
if runners, exist := f.Subscribers[int(eventOp)]; exist {
for _, runner := range runners {
fmt.Println("Calling run")
runner.Run(event.Name)
}
}
}
//
//
//
func (f *FsWatcher) visitFileInfo(p string, fi os.FileInfo, err error) error {
if fi.IsDir() {
return f.watcher.Add(p)
}
return nil
}
//
// init initializes new fsNotify Watcher in path.
//
func (f *FsWatcher) Init(path string) {
watcher, err := fsnotify.NewWatcher()
f.watcher = watcher
if err != nil {
log.Fatal(err)
}
defer f.watcher.Close()
done := make(chan bool)
locked := false
go func() {
for {
select {
case event := <-watcher.Events:
if !locked {
locked = true
f.notifySubscribers(event.Op, event)
time.AfterFunc(1*time.Second, func() { locked = false })
}
case err := <-watcher.Errors:
log.Println("error:", err)
}
}
}()
filepath.Walk(path, f.visitFileInfo)
if err != nil {
log.Fatal(err)
}
<-done
}
//
// NewFsWatcher creates a new FsWatcher instance
//
func NewFsWatcher() *FsWatcher {
return &FsWatcher{
Subscribers: make(map[int][]Runner),
}
}