Example #1
0
// ensureLeader will attempt to renew a non-nil Lease, falling back to
// acquiring a new Lease on the lead engine role.
func ensureLeader(prev registry.Lease, reg registry.Registry, machID string) (cur registry.Lease) {
	if prev != nil {
		err := prev.Renew(engineRoleLeasePeriod)
		if err == nil {
			cur = prev
			return
		} else {
			log.Errorf("Engine leadership could not be renewed: %v", err)
		}
	}

	var err error
	cur, err = reg.LeaseRole(engineRoleName, machID, engineRoleLeasePeriod)
	if err != nil {
		log.Errorf("Failed acquiring engine leadership: %v", err)
	} else if cur == nil {
		log.V(1).Infof("Unable to acquire engine leadership")
	} else {
		log.Infof("Acquired engine leadership")
	}

	return
}
Example #2
0
// ensureLeader will attempt to renew a non-nil Lease, falling back to
// acquiring a new Lease on the lead engine role.
func ensureLeader(prev registry.Lease, reg registry.Registry, machID string, ttl time.Duration) (cur registry.Lease) {
	if prev != nil {
		err := prev.Renew(ttl)
		if err == nil {
			log.V(1).Infof("Engine leadership renewed")
			cur = prev
			return
		} else {
			log.Errorf("Engine leadership lost, renewal failed: %v", err)
		}
	}

	var err error
	cur, err = reg.LeaseRole(engineRoleName, machID, ttl)
	if err != nil {
		log.Errorf("Engine leadership acquisition failed: %v", err)
	} else if cur == nil {
		log.V(1).Infof("Unable to acquire engine leadership")
	} else {
		log.Infof("Engine leadership acquired")
	}

	return
}