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Extract record batch structure (#314)
* Replace argument of writeProduceRequestV3 * Calculate recordBatch size in init * Extract writeTo method for record batch * Extract recordBatch processing from ProduceRequestV7 * Add constructor for record batch
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,108 @@ | ||
| package kafka | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "time" | ||
| ) | ||
|
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| const recordBatchHeaderSize int32 = 0 + | ||
| 8 + // base offset | ||
| 4 + // batch length | ||
| 4 + // partition leader epoch | ||
| 1 + // magic | ||
| 4 + // crc | ||
| 2 + // attributes | ||
| 4 + // last offset delta | ||
| 8 + // first timestamp | ||
| 8 + // max timestamp | ||
| 8 + // producer id | ||
| 2 + // producer epoch | ||
| 4 + // base sequence | ||
| 4 // msg count | ||
|
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| func recordBatchSize(msgs ...Message) (size int32) { | ||
| size = recordBatchHeaderSize | ||
| baseTime := msgs[0].Time | ||
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| for i := range msgs { | ||
| msg := &msgs[i] | ||
| msz := recordSize(msg, msg.Time.Sub(baseTime), int64(i)) | ||
| size += int32(msz + varIntLen(int64(msz))) | ||
| } | ||
|
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| return | ||
| } | ||
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| func compressRecordBatch(codec CompressionCodec, msgs ...Message) (compressed *bytes.Buffer, attributes int16, size int32, err error) { | ||
| compressed = acquireBuffer() | ||
| compressor := codec.NewWriter(compressed) | ||
| wb := &writeBuffer{w: compressor} | ||
|
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| for i, msg := range msgs { | ||
| wb.writeRecord(0, msgs[0].Time, int64(i), msg) | ||
| } | ||
|
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| if err = compressor.Close(); err != nil { | ||
| releaseBuffer(compressed) | ||
| return | ||
| } | ||
|
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| attributes = int16(codec.Code()) | ||
| size = recordBatchHeaderSize + int32(compressed.Len()) | ||
| return | ||
| } | ||
|
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| type recordBatch struct { | ||
| // required input parameters | ||
| codec CompressionCodec | ||
| attributes int16 | ||
| msgs []Message | ||
|
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| // parameters calculated during init | ||
| compressed *bytes.Buffer | ||
| size int32 | ||
| } | ||
|
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| func newRecordBatch(codec CompressionCodec, msgs ...Message) (r *recordBatch, err error) { | ||
| r = &recordBatch{ | ||
| codec: codec, | ||
| msgs: msgs, | ||
| } | ||
| if r.codec == nil { | ||
| r.size = recordBatchSize(r.msgs...) | ||
| } else { | ||
| r.compressed, r.attributes, r.size, err = compressRecordBatch(r.codec, r.msgs...) | ||
| } | ||
| return | ||
| } | ||
|
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| func (r *recordBatch) writeTo(wb *writeBuffer) { | ||
| wb.writeInt32(r.size) | ||
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| baseTime := r.msgs[0].Time | ||
| lastTime := r.msgs[len(r.msgs)-1].Time | ||
| if r.compressed != nil { | ||
| wb.writeRecordBatch(r.attributes, r.size, len(r.msgs), baseTime, lastTime, func(wb *writeBuffer) { | ||
| wb.Write(r.compressed.Bytes()) | ||
| }) | ||
| releaseBuffer(r.compressed) | ||
| } else { | ||
| wb.writeRecordBatch(r.attributes, r.size, len(r.msgs), baseTime, lastTime, func(wb *writeBuffer) { | ||
| for i, msg := range r.msgs { | ||
| wb.writeRecord(0, r.msgs[0].Time, int64(i), msg) | ||
| } | ||
| }) | ||
| } | ||
| } | ||
|
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| func recordSize(msg *Message, timestampDelta time.Duration, offsetDelta int64) int { | ||
| return 1 + // attributes | ||
| varIntLen(int64(milliseconds(timestampDelta))) + | ||
| varIntLen(offsetDelta) + | ||
| varBytesLen(msg.Key) + | ||
| varBytesLen(msg.Value) + | ||
| varArrayLen(len(msg.Headers), func(i int) int { | ||
| h := &msg.Headers[i] | ||
| return varStringLen(h.Key) + varBytesLen(h.Value) | ||
| }) | ||
| } |
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