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reloader.go
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reloader.go
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package reloader
import (
"sync"
"github.com/dc0d/config"
"github.com/dc0d/retry"
"github.com/fsnotify/fsnotify"
)
// Reloader .
type Reloader struct {
w *fsnotify.Watcher
l *sync.Mutex
stop chan struct{}
stopOnce *sync.Once
events chan fsnotify.Event
onError func(error)
onEvent func(fsnotify.Event)
}
// New .
func New(onError func(error)) *Reloader {
if onError == nil {
panic(ErrNilOnError)
}
w, err := fsnotify.NewWatcher()
if err != nil {
panic(err)
}
res := &Reloader{
w: w,
l: &sync.Mutex{},
stop: make(chan struct{}),
stopOnce: &sync.Once{},
onError: onError,
}
res.events = res.w.Events
go retry.Retry(
res.loop,
-1,
onError)
return res
}
// Stop .
func (r *Reloader) Stop() {
r.l.Lock()
defer r.l.Unlock()
r.stopOnce.Do(func() {
close(r.stop)
r.w.Close()
r.w = nil
})
}
// SetOnEvent .
func (r *Reloader) SetOnEvent(onEvent func(fsnotify.Event)) {
if onEvent == nil {
return
}
r.l.Lock()
defer r.l.Unlock()
r.onEvent = onEvent
}
// Add .
func (r *Reloader) Add(
fileName string,
dirs ...string) error {
r.l.Lock()
defer r.l.Unlock()
if r.w == nil {
return ErrStopped
}
fp, err := config.RelativeResource(fileName, dirs...)
if err != nil {
return err
}
return r.w.Add(fp)
}
func (r *Reloader) loop() error {
for {
select {
case <-r.stop:
return nil
case e, ok := <-r.events:
if !ok {
return nil
}
r.handleEvent(e)
}
}
}
func (r *Reloader) handleEvent(ev fsnotify.Event) {
r.l.Lock()
defer r.l.Unlock()
if r.w == nil {
return
}
if r.onEvent == nil {
return
}
go r.onEvent(ev)
}
// errors
var (
ErrNilOnError = errorf("NIL onError")
ErrStopped = errorf("STOPPED")
)