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|
package device
import (
"context"
"time"
)
type poller interface {
Wait() error
Cancel()
}
type pollerFactory func(context.Context, time.Duration, time.Duration) (context.Context, poller)
func newPoller(ctx context.Context, checkInteval, expiresIn time.Duration) (context.Context, poller) {
c, cancel := context.WithTimeout(ctx, expiresIn)
return c, &intervalPoller{
ctx: c,
interval: checkInteval,
cancelFunc: cancel,
}
}
type intervalPoller struct {
ctx context.Context
interval time.Duration
cancelFunc func()
}
func (p intervalPoller) Wait() error {
t := time.NewTimer(p.interval)
select {
case <-p.ctx.Done():
t.Stop()
return p.ctx.Err()
case <-t.C:
return nil
}
}
func (p intervalPoller) Cancel() {
p.cancelFunc()
}
|
