Xray-core/common/signal/timer.go

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2020-11-25 11:01:53 +00:00
package signal
import (
"context"
"sync"
"time"
"github.com/xtls/xray-core/v1/common"
"github.com/xtls/xray-core/v1/common/task"
)
type ActivityUpdater interface {
Update()
}
type ActivityTimer struct {
sync.RWMutex
updated chan struct{}
checkTask *task.Periodic
onTimeout func()
}
func (t *ActivityTimer) Update() {
select {
case t.updated <- struct{}{}:
default:
}
}
func (t *ActivityTimer) check() error {
select {
case <-t.updated:
default:
t.finish()
}
return nil
}
func (t *ActivityTimer) finish() {
t.Lock()
defer t.Unlock()
if t.onTimeout != nil {
t.onTimeout()
t.onTimeout = nil
}
if t.checkTask != nil {
t.checkTask.Close()
t.checkTask = nil
}
}
func (t *ActivityTimer) SetTimeout(timeout time.Duration) {
if timeout == 0 {
t.finish()
return
}
checkTask := &task.Periodic{
Interval: timeout,
Execute: t.check,
}
t.Lock()
if t.checkTask != nil {
t.checkTask.Close()
}
t.checkTask = checkTask
t.Unlock()
t.Update()
common.Must(checkTask.Start())
}
func CancelAfterInactivity(ctx context.Context, cancel context.CancelFunc, timeout time.Duration) *ActivityTimer {
timer := &ActivityTimer{
updated: make(chan struct{}, 1),
onTimeout: cancel,
}
timer.SetTimeout(timeout)
return timer
}