/
request.go
225 lines (182 loc) · 4.41 KB
/
request.go
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package kafka
import (
"fmt"
"hash/crc32"
"io"
)
type request interface {
io.WriterTo
Len() int32
Type() requestType
}
type requestType int16
const (
requestTypeProduce requestType = 0
requestTypeFetch requestType = 1
requestTypeMultiFetch requestType = 2
requestTypeMultiProduce requestType = 3
requestTypeOffsets requestType = 4
)
func (m Message) Len() int32 {
return int32(messageFullHeaderSize + len(m))
}
func (m Message) WriteTo(w io.Writer) (n int64, err error) {
compression := CompressionTypeNone
if compression != CompressionTypeNone {
return -1, fmt.Errorf("Only support none compression for now")
}
totalLen := m.Len() - 4 // Subtract the size of the length
checksum := uint32(crc32.Checksum(m, crc32.IEEETable))
return binwrite(w, totalLen, MagicTypeWithCompression, compression, checksum, m)
}
func (m Messages) Len() int32 {
l := int32(0)
for _, m := range m {
l += m.Len()
}
// Add 4 for the length overhead
return l + 4
}
func (ms Messages) WriteTo(w io.Writer) (n int64, err error) {
if n, err = binwrite(w, ms.Len()-4); err != nil {
return -1, err
}
for i, _ := range ms {
var nn int64
if nn, err = ms[i].WriteTo(w); err != nil {
return -1, err
}
n += nn
}
return
}
type OffsetsRequest struct {
TopicPartition
Time OffsetTime
MaxNumber int32
}
func (req *OffsetsRequest) Len() int32 {
return int32(2 + len([]byte(req.Topic)) + 4 + 8 + 4)
}
func (req *OffsetsRequest) WriteTo(w io.Writer) (n int64, err error) {
if n, err = writeTopic(w, req.Topic); err != nil {
return -1, err
}
var nn int64
if nn, err = binwrite(w, req.Partition, req.Time, req.MaxNumber); err != nil {
return -1, err
}
n += nn
return
}
func (*OffsetsRequest) Type() requestType {
return requestTypeOffsets
}
type FetchRequest struct {
TopicPartitionOffset
MaxSize int32
}
// Length including size in header
func (fr *FetchRequest) Len() int32 {
return int32(2 + len([]byte(fr.Topic)) + 4 + 8 + 4)
}
// Does not write its length or type so we can use this for both multi-and non-multi
func (req *FetchRequest) WriteTo(w io.Writer) (n int64, err error) {
if n, err = writeTopic(w, req.Topic); err != nil {
return -1, err
}
var l int64
if l, err = binwrite(w, req.Partition, req.Offset, req.MaxSize); err != nil {
return -1, err
}
n += l
return
}
func (*FetchRequest) Type() requestType {
return requestTypeFetch
}
type MultiFetchRequest []FetchRequest
func (m MultiFetchRequest) Len() int32 {
l := int32(0)
for _, m := range m {
l += m.Len()
}
// Add 2 for the length overhead
return l + 2
}
// Does not write its length or type so we can use this for both multi-and non-multi
func (reqs MultiFetchRequest) WriteTo(w io.Writer) (n int64, err error) {
cnt := int16(len(reqs))
// TOPICPARTITION_COUNT
if n, err = binwrite(w, cnt); err != nil {
return -1, err
}
for _, req := range reqs {
var nn int64
if nn, err = req.WriteTo(w); err != nil {
return -1, err
}
n += nn
}
return
}
func (MultiFetchRequest) Type() requestType {
return requestTypeMultiFetch
}
type ProduceRequest struct {
TopicPartition
Messages Messages
}
func (req *ProduceRequest) Len() int32 {
return int32(2+len([]byte(req.Topic))+4) + req.Messages.Len() // topiclen, topic, partition, messageslen + messages
}
func (req *ProduceRequest) WriteTo(w io.Writer) (n int64, err error) {
if n, err = writeTopic(w, req.Topic); err != nil {
return -1, err
}
var nn int64
if nn, err = binwrite(w, req.Partition); err != nil {
return -1, err
}
n += nn
if nn, err = req.Messages.WriteTo(w); err != nil {
return -1, err
}
n += nn
return
}
func (m *ProduceRequest) Type() requestType {
return requestTypeProduce
}
type MultiProduceRequest []ProduceRequest
func (reqs MultiProduceRequest) WriteTo(w io.Writer) (n int64, err error) {
cnt := int16(len(reqs))
// TOPICPARTITION_COUNT
if n, err = binwrite(w, cnt); err != nil {
return -1, err
}
for _, req := range reqs {
var nn int64
if nn, err = req.WriteTo(w); err != nil {
return -1, err
}
n += nn
}
return
}
func (m MultiProduceRequest) Len() int32 {
l := int32(0)
for _, m := range m {
l += m.Len()
}
// Add 2 for the length overhead
return l + 2
}
func (m MultiProduceRequest) Type() requestType {
return requestTypeMultiProduce
}
func writeTopic(w io.Writer, topic string) (n int64, err error) {
topicBytes := []byte(topic)
topicLen := int16(len(topicBytes))
return binwrite(w, topicLen, topicBytes)
}