sarama/packet_encoder.go

package kafka

type packetEncoder interface {
	// primitives
	putInt8(in int8)
	putInt16(in int16)
	putInt32(in int32)
	putInt64(in int64)

	// arrays
	putInt32Array(in []int32)
	putArrayCount(in int)

	// misc
	putError(in KError)
	putString(in *string)
	putBytes(in *[]byte)
	putRaw(in []byte)

	// stackable
	push(in pushEncoder)
	pushLength32()
	pushCRC32()
	pop()
}

type pushEncoder interface {
	saveOffset(in int)
	reserveLength() int
	run(curOffset int, buf []byte)
}

func buildBytes(in encoder) (*[]byte, error) {
	if in == nil {
		return nil, nil
	}

	var prepEnc prepEncoder
	var realEnc realEncoder

	in.encode(&prepEnc)
	if prepEnc.err != nil {
		return nil, prepEnc.err
	}

	realEnc.raw = make([]byte, prepEnc.length)
	in.encode(&realEnc)

	return &(realEnc.raw), nil
}