func renewLeadership(l registry.Lease, ttl time.Duration) registry.Lease {
err := l.Renew(ttl)
if err != nil {
log.Errorf("Engine leadership lost, renewal failed: %v", err)
return nil
}
log.Debugf("Engine leadership renewed")
return l
}
// 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
}
// 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
}