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timer.go
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timer.go
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package signal
import (
"context"
"time"
)
type ActivityUpdater interface {
Update()
}
type ActivityTimer struct {
updated chan struct{}
timeout chan time.Duration
closing chan struct{}
}
func (t *ActivityTimer) Update() {
select {
case t.updated <- struct{}{}:
default:
}
}
func (t *ActivityTimer) SetTimeout(timeout time.Duration) {
select {
case <-t.closing:
case t.timeout <- timeout:
}
}
func (t *ActivityTimer) run(ctx context.Context, cancel context.CancelFunc) {
defer func() {
cancel()
close(t.closing)
}()
timeout := <-t.timeout
if timeout == 0 {
return
}
ticker := time.NewTicker(timeout)
defer func() {
ticker.Stop()
}()
for {
select {
case <-ticker.C:
case <-ctx.Done():
return
case timeout := <-t.timeout:
if timeout == 0 {
return
}
ticker.Stop()
ticker = time.NewTicker(timeout)
continue
}
select {
case <-t.updated:
// Updated keep waiting.
default:
return
}
}
}
func CancelAfterInactivity(ctx context.Context, cancel context.CancelFunc, timeout time.Duration) *ActivityTimer {
timer := &ActivityTimer{
timeout: make(chan time.Duration, 1),
updated: make(chan struct{}, 1),
closing: make(chan struct{}),
}
timer.timeout <- timeout
go timer.run(ctx, cancel)
return timer
}