lbry.go/stopOnce/stopOnce.go

package stopOnce

import "sync"

type Stopper struct {
	ch   chan struct{}
	once *sync.Once
}

func New() *Stopper {
	s := &Stopper{}
	s.ch = make(chan struct{})
	s.once = &sync.Once{}
	return s
}

func (s *Stopper) Chan() <-chan struct{} {
	return s.ch
}

func (s *Stopper) Stop() {
	s.once.Do(func() {
		close(s.ch)
	})
}