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package sarama
import (
"encoding/binary"
"time"
)
const (
controlMask = 0x20
maximumRecordOverhead = 5*binary.MaxVarintLen32 + binary.MaxVarintLen64 + 1
)
//RecordHeader stores key and value for a record header
type RecordHeader struct {
Key []byte
Value []byte
}
func (h *RecordHeader) encode(pe packetEncoder) error {
if err := pe.putVarintBytes(h.Key); err != nil {
return err
}
return pe.putVarintBytes(h.Value)
}
func (h *RecordHeader) decode(pd packetDecoder) (err error) {
if h.Key, err = pd.getVarintBytes(); err != nil {
return err
}
if h.Value, err = pd.getVarintBytes(); err != nil {
return err
}
return nil
}
//Record is kafka record type
type Record struct {
Headers []*RecordHeader
Attributes int8
TimestampDelta time.Duration
OffsetDelta int64
Key []byte
Value []byte
length varintLengthField
}
func (r *Record) encode(pe packetEncoder) error {
pe.push(&r.length)
pe.putInt8(r.Attributes)
pe.putVarint(int64(r.TimestampDelta / time.Millisecond))
pe.putVarint(r.OffsetDelta)
if err := pe.putVarintBytes(r.Key); err != nil {
return err
}
if err := pe.putVarintBytes(r.Value); err != nil {
return err
}
pe.putVarint(int64(len(r.Headers)))
for _, h := range r.Headers {
if err := h.encode(pe); err != nil {
return err
}
}
return pe.pop()
}
func (r *Record) decode(pd packetDecoder) (err error) {
if err = pd.push(&r.length); err != nil {
return err
}
if r.Attributes, err = pd.getInt8(); err != nil {
return err
}
timestamp, err := pd.getVarint()
if err != nil {
return err
}
r.TimestampDelta = time.Duration(timestamp) * time.Millisecond
if r.OffsetDelta, err = pd.getVarint(); err != nil {
return err
}
if r.Key, err = pd.getVarintBytes(); err != nil {
return err
}
if r.Value, err = pd.getVarintBytes(); err != nil {
return err
}
numHeaders, err := pd.getVarint()
if err != nil {
return err
}
if numHeaders >= 0 {
r.Headers = make([]*RecordHeader, numHeaders)
}
for i := int64(0); i < numHeaders; i++ {
hdr := new(RecordHeader)
if err := hdr.decode(pd); err != nil {
return err
}
r.Headers[i] = hdr
}
return pd.pop()
}
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