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timer.go
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/
timer.go
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package signal
import (
"context"
"time"
)
type ActivityTimer interface {
Update()
}
type realActivityTimer struct {
updated chan bool
timeout time.Duration
ctx context.Context
cancel context.CancelFunc
}
func (t *realActivityTimer) Update() {
select {
case t.updated <- true:
default:
}
}
func (t *realActivityTimer) run() {
for {
select {
case <-time.After(t.timeout):
case <-t.ctx.Done():
return
}
select {
case <-t.updated:
// Updated keep waiting.
default:
t.cancel()
return
}
}
}
func CancelAfterInactivity(ctx context.Context, timeout time.Duration) (context.Context, ActivityTimer) {
ctx, cancel := context.WithCancel(ctx)
timer := &realActivityTimer{
ctx: ctx,
cancel: cancel,
timeout: timeout,
updated: make(chan bool, 1),
}
go timer.run()
return ctx, timer
}