Merge pull request #148 from coxley/unique-maps

features/unmarshal_unique: fix codegen for keys/values

.gitignore

@@ -1,2 +1,3 @@
 bin
 _vendor
+conformance/marshal.log

Makefile

@@ -64,6 +64,7 @@ gen-testproto: get-grpc-testproto gen-wkt-testproto install
 		testproto/proto3opt/opt.proto \
 		testproto/proto2/scalars.proto \
 		testproto/unsafe/unsafe.proto \
+		testproto/unique/unique.proto \
 		|| exit 1;
 	$(PROTOBUF_ROOT)/src/protoc \
 		--proto_path=testproto \

features/unmarshal/unmarshal.go

@@ -157,9 +157,7 @@ func (p *unmarshal) declareMapField(varName string, nullable bool, field *protog
 	}
 }
 
-func (p *unmarshal) mapField(varName string, field *protogen.Field) {
-	unique := proto.GetExtension(field.Desc.Options(), vtproto.E_Options).(*vtproto.Opts).GetUnique()
-
+func (p *unmarshal) mapField(varName string, field *protogen.Field, unique bool) {
 	switch field.Desc.Kind() {
 	case protoreflect.DoubleKind:
 		p.P(`var `, varName, `temp uint64`)
@@ -509,6 +507,8 @@ func (p *unmarshal) fieldItem(field *protogen.Field, fieldname string, message *
 			p.P(`m.`, fieldname, ` = &`, field.GoIdent, "{", field.GoName, `: v}`)
 			p.P(`}`)
 		} else if field.Desc.IsMap() {
+			unique := proto.GetExtension(field.Desc.Options(), vtproto.E_Options).(*vtproto.Opts).GetUnique()
+
 			goTyp, _ := p.FieldGoType(field)
 			goTypK, _ := p.FieldGoType(field.Message.Fields[0])
 			goTypV, _ := p.FieldGoType(field.Message.Fields[1])
@@ -527,9 +527,9 @@ func (p *unmarshal) fieldItem(field *protogen.Field, fieldname string, message *
 			p.P(`fieldNum := int32(wire >> 3)`)
 
 			p.P(`if fieldNum == 1 {`)
-			p.mapField("mapkey", field.Message.Fields[0])
+			p.mapField("mapkey", field.Message.Fields[0], unique)
 			p.P(`} else if fieldNum == 2 {`)
-			p.mapField("mapvalue", field.Message.Fields[1])
+			p.mapField("mapvalue", field.Message.Fields[1], unique)
 			p.P(`} else {`)
 			p.P(`iNdEx = entryPreIndex`)
 			p.P(`skippy, err := `, p.Helper("Skip"), `(dAtA[iNdEx:])`)

testproto/unique/unique.proto

@@ -5,4 +5,6 @@ import "github.com/planetscale/vtprotobuf/vtproto/ext.proto";
 
 message UniqueFieldExtension {
   string foo = 1 [(vtproto.options).unique = true];
+  map<string,int64> bar = 2 [(vtproto.options).unique = true];
+  map<int64,string> baz = 3 [(vtproto.options).unique = true];
 }

testproto/unique/unique_test.go

@@ -1,6 +1,8 @@
 package unique
 
 import (
+	"maps"
+	"slices"
 	"testing"
 	"unsafe"
 
@@ -10,6 +12,8 @@ import (
 func TestUnmarshalSameMemory(t *testing.T) {
 	m := &UniqueFieldExtension{
 		Foo: "bar",
+		Bar: map[string]int64{"key": 100},
+		Baz: map[int64]string{100: "value"},
 	}
 
 	b, err := m.MarshalVTStrict()
@@ -21,5 +25,17 @@ func TestUnmarshalSameMemory(t *testing.T) {
 	m3 := &UniqueFieldExtension{}
 	require.NoError(t, m3.UnmarshalVT(b))
 
-	require.Equal(t, unsafe.StringData(m2.Foo), unsafe.StringData(m3.Foo))
+	require.Same(t, unsafe.StringData(m2.Foo), unsafe.StringData(m3.Foo), "string field")
+
+	keys2 := slices.Collect(maps.Keys(m2.Bar))
+	keys3 := slices.Collect(maps.Keys(m3.Bar))
+	require.Len(t, keys2, 1)
+	require.Len(t, keys3, 1)
+	require.Same(t, unsafe.StringData(keys2[0]), unsafe.StringData(keys3[0]), "string key")
+
+	values2 := slices.Collect(maps.Values(m2.Baz))
+	values3 := slices.Collect(maps.Values(m3.Baz))
+	require.Len(t, values2, 1)
+	require.Len(t, values2, 1)
+	require.Same(t, unsafe.StringData(values2[0]), unsafe.StringData(values3[0]), "string value")
 }