wip

Signed-off-by: Harshit Gangal <[email protected]>

go/mysql/result.go

@@ -0,0 +1,73 @@
+/*
+Copyright 2024 The Vitess Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package mysql
+
+import (
+	"vitess.io/vitess/go/sqltypes"
+	querypb "vitess.io/vitess/go/vt/proto/query"
+)
+
+// ParseResult converts the raw packets in a QueryResult to a sqltypes.Result.
+func ParseResult(qr *querypb.QueryResult, wantfields bool) (*sqltypes.Result, error) {
+	if qr.RawPackets == nil {
+		return sqltypes.Proto3ToResult(qr), nil
+	}
+
+	var colcount int
+	for i, p := range qr.RawPackets {
+		if len(p) == 0 {
+			colcount = i
+			break
+		}
+	}
+
+	var err error
+	fieldArray := make([]querypb.Field, colcount)
+	fieldPackets := qr.RawPackets[:colcount]
+	rowPackets := qr.RawPackets[colcount+1:]
+
+	result := &sqltypes.Result{
+		RowsAffected:        qr.RowsAffected,
+		InsertID:            qr.InsertId,
+		SessionStateChanges: qr.SessionStateChanges,
+		Info:                qr.Info,
+		Fields:              make([]*querypb.Field, len(fieldPackets)),
+		Rows:                make([]sqltypes.Row, 0, len(rowPackets)),
+	}
+
+	for i, fieldpkt := range fieldPackets {
+		result.Fields[i] = &fieldArray[i]
+		if wantfields {
+			err = parseColumnDefinition(fieldpkt, result.Fields[i], i)
+		} else {
+			err = parseColumnDefinitionType(fieldpkt, result.Fields[i], i)
+		}
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	for _, rowpkt := range rowPackets {
+		r, err := parseRow(rowpkt, result.Fields, readLenEncStringAsBytes, nil)
+		if err != nil {
+			return nil, err
+		}
+		result.Rows = append(result.Rows, r)
+	}
+
+	return result, nil
+}

go/vt/servenv/grpc_codec.go

@@ -34,6 +34,10 @@ type vtprotoMessage interface {
 	SizeVT() int
 }
 
+type vtprotoMemBuffer interface {
+	MarshalToMemBufferVT() (mem.BufferSlice, error)
+}
+
 type Codec struct {
 	fallback encoding.CodecV2
 }
@@ -43,7 +47,8 @@ func (Codec) Name() string { return Name }
 var defaultBufferPool = mem.DefaultBufferPool()
 
 func (c *Codec) Marshal(v any) (mem.BufferSlice, error) {
-	if m, ok := v.(vtprotoMessage); ok {
+	switch m := v.(type) {
+	case vtprotoMessage:
 		size := m.SizeVT()
 		if mem.IsBelowBufferPoolingThreshold(size) {
 			buf := make([]byte, size)
@@ -58,9 +63,11 @@ func (c *Codec) Marshal(v any) (mem.BufferSlice, error) {
 			return nil, err
 		}
 		return mem.BufferSlice{mem.NewBuffer(buf, defaultBufferPool)}, nil
+	case vtprotoMemBuffer:
+		return m.MarshalToMemBufferVT()
+	default:
+		return c.fallback.Marshal(v)
 	}
-
-	return c.fallback.Marshal(v)
 }
 
 func (c *Codec) Unmarshal(data mem.BufferSlice, v any) error {