func (nc *NetworkClient) send(topic string, partition int32, batch []*ProducerRecord) {
	leader, err := nc.connector.GetLeader(topic, partition)
	if err != nil {
		for _, record := range batch {
			record.metadataChan <- &RecordMetadata{Record: record, Error: err}
		}
	}

	request := new(siesta.ProduceRequest)
	request.RequiredAcks = int16(nc.requiredAcks)
	request.AckTimeoutMs = nc.ackTimeoutMs
	for _, record := range batch {
		request.AddMessage(record.Topic, record.Partition, &siesta.Message{Key: record.encodedKey, Value: record.encodedValue})
	}
	responseChan := nc.selector.Send(leader, request)

	if nc.requiredAcks > 0 {
		go listenForResponse(topic, partition, batch, responseChan)
	} else {
		// acks = 0 case, just complete all requests
		for _, record := range batch {
			record.metadataChan <- &RecordMetadata{
				Record:    record,
				Offset:    -1,
				Topic:     topic,
				Partition: partition,
				Error:     siesta.ErrNoError,
			}
		}
	}
}
func TestSelector(t *testing.T) {
	selectorConfig := DefaultSelectorConfig()
	selector := NewSelector(selectorConfig)

	link := siesta.NewBrokerLink(&siesta.Broker{ID: 1, Host: "localhost", Port: 9092},
		true,
		1*time.Minute,
		5)

	request1 := new(siesta.ProduceRequest)
	request1.RequiredAcks = 1
	request1.AckTimeoutMs = 2000
	request1.AddMessage("siesta", 0, &siesta.Message{MagicByte: 0, Value: []byte("hello world")})

	request2 := new(siesta.ProduceRequest)
	request2.RequiredAcks = 1
	request2.AckTimeoutMs = 2000
	request2.AddMessage("siesta", 0, &siesta.Message{MagicByte: 0, Value: []byte("hello world again")})

	responseChan1 := selector.Send(link, request1)
	responseChan2 := selector.Send(link, request2)

	//make sure we can read in other order than was sent
	response2 := <-responseChan2
	response1 := <-responseChan1

	assert(t, response1.err, nil)
	assert(t, response2.err, nil)
}
func (nc *NetworkClient) buildProduceRequest(batch []*ProducerRecord) *siesta.ProduceRequest {
	request := new(siesta.ProduceRequest)
	request.RequiredAcks = int16(nc.RequiredAcks)
	request.AckTimeoutMs = nc.AckTimeoutMs
	for _, record := range batch {
		request.AddMessage(record.Topic, record.Partition, &siesta.Message{Key: record.encodedKey, Value: record.encodedValue})
	}

	return request
}