clientv3/concurrency/election.go
func (e *Election) Leader(ctx context.Context) (*v3.GetResponse, error) {
	client := e.session.Client()
	resp, err := client.Get(ctx, e.keyPrefix, v3.WithFirstCreate()...)
	if err != nil {
		return nil, err
	} else if len(resp.Kvs) == 0 {
		// no leader currently elected
		return nil, ErrElectionNoLeader
	}
	return resp, nil
}
func (e *Election) Leader(ctx context.Context) (*v3.GetResponse, error) {
	client := e.session.Client()
	resp, err := client.Get(ctx, e.keyPrefix, v3.WithFirstCreate()...)
	if err != nil {
		return nil, err
	} else if len(resp.Kvs) == 0 {
		// no leader currently elected
		return nil, ErrElectionNoLeader
	}
	return resp, nil
}
// Leader returns the leader value for the current election.