1 files changed, 109 insertions, 0 deletions
diff --git a/weed/mq/segment/message_serde.go b/weed/mq/segment/message_serde.go
new file mode 100644
index 000000000..66a76c57d
--- /dev/null
+++ b/weed/mq/segment/message_serde.go
@@ -0,0 +1,109 @@
+package segment
+
+import (
+	flatbuffers "github.com/google/flatbuffers/go"
+	"github.com/seaweedfs/seaweedfs/weed/pb/message_fbs"
+)
+
+type MessageBatchBuilder struct {
+	b              *flatbuffers.Builder
+	producerId     int32
+	producerEpoch  int32
+	segmentId      int32
+	flags          int32
+	messageOffsets []flatbuffers.UOffsetT
+	segmentSeqBase int64
+	segmentSeqLast int64
+	tsMsBase       int64
+	tsMsLast       int64
+}
+
+func NewMessageBatchBuilder(b *flatbuffers.Builder,
+	producerId int32,
+	producerEpoch int32,
+	segmentId int32,
+	flags int32) *MessageBatchBuilder {
+
+	b.Reset()
+
+	return &MessageBatchBuilder{
+		b:             b,
+		producerId:    producerId,
+		producerEpoch: producerEpoch,
+		segmentId:     segmentId,
+		flags:         flags,
+	}
+}
+
+func (builder *MessageBatchBuilder) AddMessage(segmentSeq int64, tsMs int64, properties map[string][]byte, key []byte, value []byte) {
+	if builder.segmentSeqBase == 0 {
+		builder.segmentSeqBase = segmentSeq
+	}
+	builder.segmentSeqLast = segmentSeq
+	if builder.tsMsBase == 0 {
+		builder.tsMsBase = tsMs
+	}
+	builder.tsMsLast = tsMs
+
+	var names, values, pairs []flatbuffers.UOffsetT
+	for k, v := range properties {
+		names = append(names, builder.b.CreateString(k))
+		values = append(values, builder.b.CreateByteVector(v))
+	}
+	for i, _ := range names {
+		message_fbs.NameValueStart(builder.b)
+		message_fbs.NameValueAddName(builder.b, names[i])
+		message_fbs.NameValueAddValue(builder.b, values[i])
+		pair := message_fbs.NameValueEnd(builder.b)
+		pairs = append(pairs, pair)
+	}
+
+	message_fbs.MessageStartPropertiesVector(builder.b, len(properties))
+	for i := len(pairs) - 1; i >= 0; i-- {
+		builder.b.PrependUOffsetT(pairs[i])
+	}
+	propOffset := builder.b.EndVector(len(properties))
+
+	keyOffset := builder.b.CreateByteVector(key)
+	valueOffset := builder.b.CreateByteVector(value)
+
+	message_fbs.MessageStart(builder.b)
+	message_fbs.MessageAddSeqDelta(builder.b, int32(segmentSeq-builder.segmentSeqBase))
+	message_fbs.MessageAddTsMsDelta(builder.b, int32(tsMs-builder.tsMsBase))
+
+	message_fbs.MessageAddProperties(builder.b, propOffset)
+	message_fbs.MessageAddKey(builder.b, keyOffset)
+	message_fbs.MessageAddData(builder.b, valueOffset)
+	messageOffset := message_fbs.MessageEnd(builder.b)
+
+	builder.messageOffsets = append(builder.messageOffsets, messageOffset)
+
+}
+
+func (builder *MessageBatchBuilder) BuildMessageBatch() {
+	message_fbs.MessageBatchStartMessagesVector(builder.b, len(builder.messageOffsets))
+	for i := len(builder.messageOffsets) - 1; i >= 0; i-- {
+		builder.b.PrependUOffsetT(builder.messageOffsets[i])
+	}
+	messagesOffset := builder.b.EndVector(len(builder.messageOffsets))
+
+	message_fbs.MessageBatchStart(builder.b)
+	message_fbs.MessageBatchAddProducerId(builder.b, builder.producerId)
+	message_fbs.MessageBatchAddProducerEpoch(builder.b, builder.producerEpoch)
+	message_fbs.MessageBatchAddSegmentId(builder.b, builder.segmentId)
+	message_fbs.MessageBatchAddFlags(builder.b, builder.flags)
+	message_fbs.MessageBatchAddSegmentSeqBase(builder.b, builder.segmentSeqBase)
+	message_fbs.MessageBatchAddSegmentSeqMaxDelta(builder.b, int32(builder.segmentSeqLast-builder.segmentSeqBase))
+	message_fbs.MessageBatchAddTsMsBase(builder.b, builder.tsMsBase)
+	message_fbs.MessageBatchAddTsMsMaxDelta(builder.b, int32(builder.tsMsLast-builder.tsMsBase))
+
+	message_fbs.MessageBatchAddMessages(builder.b, messagesOffset)
+
+	messageBatch := message_fbs.MessageBatchEnd(builder.b)
+
+	builder.b.Finish(messageBatch)
+}
+
+func (builder *MessageBatchBuilder) GetBytes() []byte {
+	return builder.b.FinishedBytes()
+}