cloudflared-mirror/vendor/github.com/coreos/pkg/timeutil/backoff.go

package timeutil

import (
	"time"
)

func ExpBackoff(prev, max time.Duration) time.Duration {
	if prev == 0 {
		return time.Second
	}
	if prev > max/2 {
		return max
	}
	return 2 * prev
}