Add pulsar message stream for system

Signed-off-by: Nxige-16 <xi.ge@zilliz.com>

internal/msgstream/msgstream.go

@@ -2,10 +2,12 @@ package msgstream
 
 import (
 	"context"
+	"github.com/zilliztech/milvus-distributed/internal/errors"
 	"log"
 	"sync"
 
 	"github.com/golang/protobuf/proto"
+	commonPb "github.com/zilliztech/milvus-distributed/internal/proto/commonpb"
 	internalPb "github.com/zilliztech/milvus-distributed/internal/proto/internalpb"
 
 	"github.com/apache/pulsar-client-go/pulsar"
@@ -22,7 +24,7 @@ type MsgPack struct {
 	Msgs    []*TsMsg
 }
 
-type RepackFunc func(msgs []*TsMsg, hashKeys [][]int32) map[int32]*MsgPack
+type RepackFunc func(msgs []*TsMsg, hashKeys [][]int32) (map[int32]*MsgPack, error)
 
 type MsgStream interface {
 	Start()
@@ -145,21 +147,22 @@ func (ms *PulsarMsgStream) Produce(msgPack *MsgPack) error {
 	}
 
 	var result map[int32]*MsgPack
+	var err error
 	if ms.repackFunc != nil {
-		result = ms.repackFunc(tsMsgs, reBucketValues)
+		result, err = ms.repackFunc(tsMsgs, reBucketValues)
 	} else {
-		result = make(map[int32]*MsgPack)
-		for i, request := range tsMsgs {
-			keys := reBucketValues[i]
-			for _, channelID := range keys {
-				_, ok := result[channelID]
-				if !ok {
-					msgPack := MsgPack{}
-					result[channelID] = &msgPack
-				}
-				result[channelID].Msgs = append(result[channelID].Msgs, request)
+		msgType := (*tsMsgs[0]).Type()
+		switch msgType {
+		case internalPb.MsgType_kInsert:
+			result, err = insertRepackFunc(tsMsgs, reBucketValues)
+		case internalPb.MsgType_kDelete:
+			result, err = deleteRepackFunc(tsMsgs, reBucketValues)
+		default:
+			result, err = defaultRepackFunc(tsMsgs, reBucketValues)
 		}
 	}
+	if err != nil {
+		return err
 	}
 	for k, v := range result {
 		for i := 0; i < len(v.Msgs); i++ {
@@ -381,3 +384,113 @@ func checkTimeTickMsg(msg map[int]Timestamp) (Timestamp, bool) {
 	}
 	return 0, false
 }
+
+func insertRepackFunc(tsMsgs []*TsMsg, hashKeys [][]int32) (map[int32]*MsgPack, error) {
+	result := make(map[int32]*MsgPack)
+	for i, request := range tsMsgs {
+		if (*request).Type() != internalPb.MsgType_kInsert {
+			return nil, errors.New(string("msg's must be Insert"))
+		}
+		insertRequest := (*request).(*InsertMsg)
+		keys := hashKeys[i]
+
+		timestampLen := len(insertRequest.Timestamps)
+		rowIDLen := len(insertRequest.RowIds)
+		rowDataLen := len(insertRequest.RowData)
+		keysLen := len(keys)
+
+		if keysLen != timestampLen || keysLen != rowIDLen || keysLen != rowDataLen {
+			return nil, errors.New(string("the length of hashValue, timestamps, rowIDs, RowData are not equal"))
+		}
+		for index, key := range keys {
+			_, ok := result[key]
+			if !ok {
+				msgPack := MsgPack{}
+				result[key] = &msgPack
+			}
+
+			sliceRequest := internalPb.InsertRequest{
+				MsgType: internalPb.MsgType_kInsert,
+				ReqId: insertRequest.ReqId,
+				CollectionName: insertRequest.CollectionName,
+				PartitionTag: insertRequest.PartitionTag,
+				SegmentId: insertRequest.SegmentId,
+				ChannelId: insertRequest.ChannelId,
+				ProxyId: insertRequest.ProxyId,
+				Timestamps: []uint64{insertRequest.Timestamps[index]},
+				RowIds: []int64{insertRequest.RowIds[index]},
+				RowData: []*commonPb.Blob{insertRequest.RowData[index]},
+			}
+
+			var msg TsMsg = &InsertMsg{
+				InsertRequest: sliceRequest,
+			}
+
+			result[key].Msgs = append(result[key].Msgs, &msg)
+		}
+	}
+	return result, nil
+}
+
+func deleteRepackFunc(tsMsgs []*TsMsg, hashKeys [][]int32) (map[int32]*MsgPack, error) {
+	result := make(map[int32]*MsgPack)
+	for i, request := range tsMsgs {
+		if (*request).Type() != internalPb.MsgType_kDelete {
+			return nil, errors.New(string("msg's must be Delete"))
+		}
+		deleteRequest := (*request).(*DeleteMsg)
+		keys := hashKeys[i]
+
+		timestampLen := len(deleteRequest.Timestamps)
+		primaryKeysLen := len(deleteRequest.PrimaryKeys)
+		keysLen := len(keys)
+
+		if keysLen != timestampLen || keysLen != primaryKeysLen {
+			return nil, errors.New(string("the length of hashValue, timestamps, primaryKeys are not equal"))
+		}
+
+		for index, key := range keys {
+			_, ok := result[key]
+			if !ok {
+				msgPack := MsgPack{}
+				result[key] = &msgPack
+			}
+
+			sliceRequest := internalPb.DeleteRequest{
+				MsgType: internalPb.MsgType_kDelete,
+				ReqId: deleteRequest.ReqId,
+				CollectionName: deleteRequest.CollectionName,
+				ChannelId: deleteRequest.ChannelId,
+				ProxyId: deleteRequest.ProxyId,
+				Timestamps: []uint64{deleteRequest.Timestamps[index]},
+				PrimaryKeys: []int64{deleteRequest.PrimaryKeys[index]},
+			}
+
+			var msg TsMsg = &DeleteMsg{
+				DeleteRequest: sliceRequest,
+			}
+
+			result[key].Msgs = append(result[key].Msgs, &msg)
+		}
+	}
+	return result, nil
+}
+
+func defaultRepackFunc(tsMsgs []*TsMsg, hashKeys [][]int32) (map[int32]*MsgPack, error) {
+	result := make(map[int32]*MsgPack)
+	for i, request := range tsMsgs {
+		keys := hashKeys[i]
+		if len(keys) != 1 {
+			return nil, errors.New(string("len(msg.hashValue) must equal 1"))
+		}
+		key := keys[0]
+		_, ok := result[key]
+		if !ok {
+			msgPack := MsgPack{}
+			result[key] = &msgPack
+		}
+
+		result[key].Msgs = append(result[key].Msgs, request)
+	}
+	return result, nil
+}

internal/msgstream/msgstream_test.go

@@ -3,13 +3,14 @@ package msgstream
 import (
 	"context"
 	"fmt"
+	"log"
 	"testing"
 
 	commonPb "github.com/zilliztech/milvus-distributed/internal/proto/commonpb"
 	internalPb "github.com/zilliztech/milvus-distributed/internal/proto/internalpb"
 )
 
-func repackFunc(msgs []*TsMsg, hashKeys [][]int32) map[int32]*MsgPack {
+func repackFunc(msgs []*TsMsg, hashKeys [][]int32) (map[int32]*MsgPack, error) {
 	result := make(map[int32]*MsgPack)
 	for i, request := range msgs {
 		keys := hashKeys[i]
@@ -22,7 +23,7 @@ func repackFunc(msgs []*TsMsg, hashKeys [][]int32) map[int32]*MsgPack {
 			result[channelID].Msgs = append(result[channelID].Msgs, request)
 		}
 	}
-	return result
+	return result, nil
 }
 
 func getTsMsg(msgType MsgType, reqID UniqueID, hashValue int32) *TsMsg {
@@ -43,6 +44,8 @@ func getTsMsg(msgType MsgType, reqID UniqueID, hashValue int32) *TsMsg {
 			ChannelId:      1,
 			ProxyId:        1,
 			Timestamps:     []Timestamp{1},
+			RowIds:         []int64{1},
+			RowData:        []*commonPb.Blob{{}},
 		}
 		insertMsg := &InsertMsg{
 			BaseMsg:       baseMsg,
@@ -209,7 +212,11 @@ func TestStream_PulsarMsgStream_Insert(t *testing.T) {
 	msgPack.Msgs = append(msgPack.Msgs, getTsMsg(internalPb.MsgType_kInsert, 3, 3))
 
 	inputStream, outputStream := initPulsarStream(pulsarAddress, producerChannels, consumerChannels, consumerSubName)
-	(*inputStream).Produce(&msgPack)
+	err := (*inputStream).Produce(&msgPack)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
+
 	receiveMsg(outputStream, len(msgPack.Msgs))
 	(*inputStream).Close()
 	(*outputStream).Close()
@@ -227,7 +234,10 @@ func TestStream_PulsarMsgStream_Delete(t *testing.T) {
 	msgPack.Msgs = append(msgPack.Msgs, getTsMsg(internalPb.MsgType_kDelete, 3, 3))
 
 	inputStream, outputStream := initPulsarStream(pulsarAddress, producerChannels, consumerChannels, consumerSubName)
-	(*inputStream).Produce(&msgPack)
+	err := (*inputStream).Produce(&msgPack)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
 	receiveMsg(outputStream, len(msgPack.Msgs))
 	(*inputStream).Close()
 	(*outputStream).Close()
@@ -244,7 +254,10 @@ func TestStream_PulsarMsgStream_Search(t *testing.T) {
 	msgPack.Msgs = append(msgPack.Msgs, getTsMsg(internalPb.MsgType_kSearch, 3, 3))
 
 	inputStream, outputStream := initPulsarStream(pulsarAddress, producerChannels, consumerChannels, consumerSubName)
-	(*inputStream).Produce(&msgPack)
+	err := (*inputStream).Produce(&msgPack)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
 	receiveMsg(outputStream, len(msgPack.Msgs))
 	(*inputStream).Close()
 	(*outputStream).Close()
@@ -261,7 +274,10 @@ func TestStream_PulsarMsgStream_SearchResult(t *testing.T) {
 	msgPack.Msgs = append(msgPack.Msgs, getTsMsg(internalPb.MsgType_kSearchResult, 3, 3))
 
 	inputStream, outputStream := initPulsarStream(pulsarAddress, producerChannels, consumerChannels, consumerSubName)
-	(*inputStream).Produce(&msgPack)
+	err := (*inputStream).Produce(&msgPack)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
 	receiveMsg(outputStream, len(msgPack.Msgs))
 	(*inputStream).Close()
 	(*outputStream).Close()
@@ -278,7 +294,10 @@ func TestStream_PulsarMsgStream_TimeTick(t *testing.T) {
 	msgPack.Msgs = append(msgPack.Msgs, getTsMsg(internalPb.MsgType_kTimeTick, 3, 3))
 
 	inputStream, outputStream := initPulsarStream(pulsarAddress, producerChannels, consumerChannels, consumerSubName)
-	(*inputStream).Produce(&msgPack)
+	err := (*inputStream).Produce(&msgPack)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
 	receiveMsg(outputStream, len(msgPack.Msgs))
 	(*inputStream).Close()
 	(*outputStream).Close()
@@ -295,7 +314,10 @@ func TestStream_PulsarMsgStream_BroadCast(t *testing.T) {
 	msgPack.Msgs = append(msgPack.Msgs, getTsMsg(internalPb.MsgType_kTimeTick, 3, 3))
 
 	inputStream, outputStream := initPulsarStream(pulsarAddress, producerChannels, consumerChannels, consumerSubName)
-	(*inputStream).Broadcast(&msgPack)
+	err := (*inputStream).Broadcast(&msgPack)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
 	receiveMsg(outputStream, len(consumerChannels)*len(msgPack.Msgs))
 	(*inputStream).Close()
 	(*outputStream).Close()
@@ -312,12 +334,164 @@ func TestStream_PulsarMsgStream_RepackFunc(t *testing.T) {
 	msgPack.Msgs = append(msgPack.Msgs, getTsMsg(internalPb.MsgType_kInsert, 3, 3))
 
 	inputStream, outputStream := initPulsarStream(pulsarAddress, producerChannels, consumerChannels, consumerSubName, repackFunc)
-	(*inputStream).Produce(&msgPack)
+	err := (*inputStream).Produce(&msgPack)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
 	receiveMsg(outputStream, len(msgPack.Msgs))
 	(*inputStream).Close()
 	(*outputStream).Close()
 }
 
+func TestStream_PulsarMsgStream_InsertRepackFunc(t *testing.T) {
+	pulsarAddress := "pulsar://localhost:6650"
+	producerChannels := []string{"insert1", "insert2"}
+	consumerChannels := []string{"insert1", "insert2"}
+	consumerSubName := "subInsert"
+
+	baseMsg := BaseMsg{
+		BeginTimestamp: 0,
+		EndTimestamp:   0,
+		HashValues:     []int32{1, 3},
+	}
+
+	insertRequest := internalPb.InsertRequest{
+		MsgType:        internalPb.MsgType_kInsert,
+		ReqId:          1,
+		CollectionName: "Collection",
+		PartitionTag:   "Partition",
+		SegmentId:      1,
+		ChannelId:      1,
+		ProxyId:        1,
+		Timestamps:     []Timestamp{1, 1},
+		RowIds:         []int64{1, 3},
+		RowData:        []*commonPb.Blob{{}, {}},
+	}
+	insertMsg := &InsertMsg{
+		BaseMsg:       baseMsg,
+		InsertRequest: insertRequest,
+	}
+	var tsMsg TsMsg = insertMsg
+	msgPack := MsgPack{}
+	msgPack.Msgs = append(msgPack.Msgs, &tsMsg)
+
+	inputStream := NewPulsarMsgStream(context.Background(), 100)
+	inputStream.SetPulsarCient(pulsarAddress)
+	inputStream.CreatePulsarProducers(producerChannels)
+	inputStream.Start()
+
+	outputStream := NewPulsarMsgStream(context.Background(), 100)
+	outputStream.SetPulsarCient(pulsarAddress)
+	unmarshalDispatcher := NewUnmarshalDispatcher()
+	outputStream.CreatePulsarConsumers(consumerChannels, consumerSubName, unmarshalDispatcher, 100)
+	outputStream.Start()
+	var output MsgStream = outputStream
+
+	err := (*inputStream).Produce(&msgPack)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
+	receiveMsg(&output, len(msgPack.Msgs)*2)
+	(*inputStream).Close()
+	(*outputStream).Close()
+}
+
+func TestStream_PulsarMsgStream_DeleteRepackFunc(t *testing.T) {
+	pulsarAddress := "pulsar://localhost:6650"
+	producerChannels := []string{"insert1", "insert2"}
+	consumerChannels := []string{"insert1", "insert2"}
+	consumerSubName := "subInsert"
+
+	baseMsg := BaseMsg{
+		BeginTimestamp: 0,
+		EndTimestamp:   0,
+		HashValues:     []int32{1, 3},
+	}
+
+	deleteRequest := internalPb.DeleteRequest{
+		MsgType:        internalPb.MsgType_kDelete,
+		ReqId:          1,
+		CollectionName: "Collection",
+		ChannelId:      1,
+		ProxyId:        1,
+		Timestamps:     []Timestamp{1, 1},
+		PrimaryKeys:    []int64{1, 3},
+	}
+	deleteMsg := &DeleteMsg{
+		BaseMsg:       baseMsg,
+		DeleteRequest: deleteRequest,
+	}
+	var tsMsg TsMsg = deleteMsg
+	msgPack := MsgPack{}
+	msgPack.Msgs = append(msgPack.Msgs, &tsMsg)
+
+	inputStream := NewPulsarMsgStream(context.Background(), 100)
+	inputStream.SetPulsarCient(pulsarAddress)
+	inputStream.CreatePulsarProducers(producerChannels)
+	inputStream.Start()
+
+	outputStream := NewPulsarMsgStream(context.Background(), 100)
+	outputStream.SetPulsarCient(pulsarAddress)
+	unmarshalDispatcher := NewUnmarshalDispatcher()
+	outputStream.CreatePulsarConsumers(consumerChannels, consumerSubName, unmarshalDispatcher, 100)
+	outputStream.Start()
+	var output MsgStream = outputStream
+
+	err := (*inputStream).Produce(&msgPack)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
+	receiveMsg(&output, len(msgPack.Msgs)*2)
+	(*inputStream).Close()
+	(*outputStream).Close()
+}
+
+func TestStream_PulsarMsgStream_DefaultRepackFunc(t *testing.T) {
+	pulsarAddress := "pulsar://localhost:6650"
+	producerChannels := []string{"insert1", "insert2"}
+	consumerChannels := []string{"insert1", "insert2"}
+	consumerSubName := "subInsert"
+
+	baseMsg := BaseMsg{
+		BeginTimestamp: 0,
+		EndTimestamp:   0,
+		HashValues:     []int32{1},
+	}
+
+	timeTickRequest := internalPb.TimeTickMsg{
+		MsgType:   internalPb.MsgType_kTimeTick,
+		PeerId:    int64(1),
+		Timestamp: uint64(1),
+	}
+	timeTick := &TimeTickMsg{
+		BaseMsg:       baseMsg,
+		TimeTickMsg: timeTickRequest,
+	}
+	var tsMsg TsMsg = timeTick
+	msgPack := MsgPack{}
+	msgPack.Msgs = append(msgPack.Msgs, &tsMsg)
+
+	inputStream := NewPulsarMsgStream(context.Background(), 100)
+	inputStream.SetPulsarCient(pulsarAddress)
+	inputStream.CreatePulsarProducers(producerChannels)
+	inputStream.Start()
+
+	outputStream := NewPulsarMsgStream(context.Background(), 100)
+	outputStream.SetPulsarCient(pulsarAddress)
+	unmarshalDispatcher := NewUnmarshalDispatcher()
+	outputStream.CreatePulsarConsumers(consumerChannels, consumerSubName, unmarshalDispatcher, 100)
+	outputStream.Start()
+	var output MsgStream = outputStream
+
+	err := (*inputStream).Produce(&msgPack)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
+	receiveMsg(&output, len(msgPack.Msgs))
+	(*inputStream).Close()
+	(*outputStream).Close()
+}
+
 func TestStream_PulsarTtMsgStream_Insert(t *testing.T) {
 	pulsarAddress := "pulsar://localhost:6650"
 	producerChannels := []string{"insert1", "insert2"}
@@ -335,9 +509,18 @@ func TestStream_PulsarTtMsgStream_Insert(t *testing.T) {
 	msgPack2.Msgs = append(msgPack2.Msgs, getTimeTickMsg(5, 5, 5))
 
 	inputStream, outputStream := initPulsarTtStream(pulsarAddress, producerChannels, consumerChannels, consumerSubName)
-	(*inputStream).Broadcast(&msgPack0)
-	(*inputStream).Produce(&msgPack1)
-	(*inputStream).Broadcast(&msgPack2)
+	err := (*inputStream).Broadcast(&msgPack0)
+	if err != nil {
+		log.Fatalf("broadcast error = %v", err)
+	}
+	err = (*inputStream).Produce(&msgPack1)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
+	err = (*inputStream).Broadcast(&msgPack2)
+	if err != nil {
+		log.Fatalf("broadcast error = %v", err)
+	}
 	receiveMsg(outputStream, len(msgPack1.Msgs))
 	outputTtStream := (*outputStream).(*PulsarTtMsgStream)
 	fmt.Printf("timestamp = %v", outputTtStream.lastTimeStamp)

internal/msgstream/task_test.go

@@ -2,7 +2,10 @@ package msgstream
 
 import (
 	"context"
+	"errors"
 	"fmt"
+	commonPb "github.com/zilliztech/milvus-distributed/internal/proto/commonpb"
+	"log"
 	"testing"
 
 	"github.com/golang/protobuf/proto"
@@ -37,6 +40,53 @@ func (tt *InsertTask) Unmarshal(input []byte) (*TsMsg, error) {
 	return &tsMsg, nil
 }
 
+func newRepackFunc(tsMsgs []*TsMsg, hashKeys [][]int32) (map[int32]*MsgPack, error) {
+	result := make(map[int32]*MsgPack)
+	for i, request := range tsMsgs {
+		if (*request).Type() != internalPb.MsgType_kInsert {
+			return nil, errors.New(string("msg's must be Insert"))
+		}
+		insertRequest := (*request).(*InsertTask).InsertRequest
+		keys := hashKeys[i]
+
+		timestampLen := len(insertRequest.Timestamps)
+		rowIDLen := len(insertRequest.RowIds)
+		rowDataLen := len(insertRequest.RowData)
+		keysLen := len(keys)
+
+		if keysLen != timestampLen || keysLen != rowIDLen || keysLen != rowDataLen {
+			return nil, errors.New(string("the length of hashValue, timestamps, rowIDs, RowData are not equal"))
+		}
+		for index, key := range keys {
+			_, ok := result[key]
+			if !ok {
+				msgPack := MsgPack{}
+				result[key] = &msgPack
+			}
+
+			sliceRequest := internalPb.InsertRequest{
+				MsgType:        internalPb.MsgType_kInsert,
+				ReqId:          insertRequest.ReqId,
+				CollectionName: insertRequest.CollectionName,
+				PartitionTag:   insertRequest.PartitionTag,
+				SegmentId:      insertRequest.SegmentId,
+				ChannelId:      insertRequest.ChannelId,
+				ProxyId:        insertRequest.ProxyId,
+				Timestamps:     []uint64{insertRequest.Timestamps[index]},
+				RowIds:         []int64{insertRequest.RowIds[index]},
+				RowData:        []*commonPb.Blob{insertRequest.RowData[index]},
+			}
+
+			var msg TsMsg = &InsertTask{
+				InsertMsg: InsertMsg{InsertRequest: sliceRequest},
+			}
+
+			result[key].Msgs = append(result[key].Msgs, &msg)
+		}
+	}
+	return result, nil
+}
+
 func getMsg(reqID UniqueID, hashValue int32) *TsMsg {
 	var tsMsg TsMsg
 	baseMsg := BaseMsg{
@@ -53,6 +103,8 @@ func getMsg(reqID UniqueID, hashValue int32) *TsMsg {
 		ChannelId:      1,
 		ProxyId:        1,
 		Timestamps:     []Timestamp{1},
+		RowIds:         []int64{1},
+		RowData:        []*commonPb.Blob{{}},
 	}
 	insertMsg := InsertMsg{
 		BaseMsg:       baseMsg,
@@ -79,6 +131,7 @@ func TestStream_task_Insert(t *testing.T) {
 	inputStream := NewPulsarMsgStream(context.Background(), 100)
 	inputStream.SetPulsarCient(pulsarAddress)
 	inputStream.CreatePulsarProducers(producerChannels)
+	inputStream.SetRepackFunc(newRepackFunc)
 	inputStream.Start()
 
 	outputStream := NewPulsarMsgStream(context.Background(), 100)
@@ -89,7 +142,10 @@ func TestStream_task_Insert(t *testing.T) {
 	outputStream.CreatePulsarConsumers(consumerChannels, consumerSubName, unmarshalDispatcher, 100)
 	outputStream.Start()
 
-	inputStream.Produce(&msgPack)
+	err := inputStream.Produce(&msgPack)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
 	receiveCount := 0
 	for {
 		result := (*outputStream).Consume()

internal/msgstream/unmarshal_test.go

@@ -3,6 +3,7 @@ package msgstream
 import (
 	"context"
 	"fmt"
+	"log"
 	"testing"
 
 	"github.com/golang/protobuf/proto"
@@ -47,7 +48,10 @@ func TestStream_unmarshal_Insert(t *testing.T) {
 	outputStream.CreatePulsarConsumers(consumerChannels, consumerSubName, unmarshalDispatcher, 100)
 	outputStream.Start()
 
-	inputStream.Produce(&msgPack)
+	err := inputStream.Produce(&msgPack)
+	if err != nil {
+		log.Fatalf("produce error = %v", err)
+	}
 	receiveCount := 0
 	for {
 		result := (*outputStream).Consume()