[#126] Refine CODEOWNERS settings

Signed-off-by: Vitaliy Potyarkin <v.potyarkin@yadro.com>

.forgejo/logo.svg

@@ -0,0 +1,70 @@
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.github/CODEOWNERS

@@ -1 +0,0 @@
-*   @TrueCloudLab/storage-core @TrueCloudLab/storage-services @TrueCloudLab/committers

.golangci.yml

@@ -50,7 +50,7 @@ linters:
     - bidichk
     - durationcheck
     - exhaustive
-    - exportloopref
+    - copyloopvar
     - gofmt
     - goimports
     - misspell

CODEOWNERS

@@ -0,0 +1,2 @@
+.*          @TrueCloudLab/storage-core-committers @TrueCloudLab/storage-core-developers @TrueCloudLab/storage-services-committers @TrueCloudLab/storage-services-developers
+.forgejo/.* @potyarkin

CONTRIBUTING.md

@@ -25,7 +25,8 @@ Start by forking the `frostfs-api-go` repository, make changes in a branch and t
 send a pull request. We encourage pull requests to discuss code changes. Here
 are the steps in details:
 
-### Set up your GitHub Repository
+### Set up your repository
+
 Fork [FrostFS node upstream](https://git.frostfs.info/TrueCloudLab/frostfs-api-go/fork) source
 repository to your own personal repository. Copy the URL of your fork (you will
 need it for the `git clone` command below).
@@ -86,7 +87,7 @@ $ git push origin feature/123-something_awesome
 ```
 
 ### Create a Pull Request
-Pull requests can be created via GitHub. Refer to [this
+Pull requests can be created via git.frostfs.info. Refer to [this
 document](https://help.github.com/articles/creating-a-pull-request/) for
 detailed steps on how to create a pull request. After a Pull Request gets peer
 reviewed and approved, it will be merged.

README.md

@@ -1,5 +1,5 @@
 <p align="center">
-<img src="./.github/logo.svg" width="500px" alt="FrostFS">
+<img src="./.forgejo/logo.svg" width="500px" alt="FrostFS">
 </p>
 <p align="center">
   Low-level Golang API for <a href="https://frostfs.info">FrostFS</a>

docs/release-instruction.md

@@ -35,11 +35,11 @@ Tag a release (must be signed) and push it:
 $ git tag -s vX.Y.Z[-rc.N] && git push origin vX.Y.Z[-rc.N]
 ```
 
-## Make a Github release
+## Make a proper release
 
-Using Github's web interface create a new release based on just created tag
+Using git.frostfs.info web interface create a new release based on just created tag
 with the same changes from changelog and publish it.
 
-## Close github milestone
+## Close milestone
 
-Close corresponding vX.Y.Z github milestone.
+Close corresponding vX.Y.Z milestone.

go.mod

@@ -7,9 +7,9 @@ require (
 	github.com/VictoriaMetrics/easyproto v0.1.4
 	github.com/mailru/easyjson v0.7.7
 	github.com/stretchr/testify v1.8.3
-	golang.org/x/sync v0.6.0
-	google.golang.org/grpc v1.63.2
-	google.golang.org/protobuf v1.33.0
+	golang.org/x/sync v0.7.0
+	google.golang.org/grpc v1.66.2
+	google.golang.org/protobuf v1.34.1
 )
 
 require (
@@ -19,10 +19,10 @@ require (
 	github.com/kr/pretty v0.1.0 // indirect
 	github.com/mr-tron/base58 v1.2.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	golang.org/x/net v0.21.0 // indirect
-	golang.org/x/sys v0.17.0 // indirect
-	golang.org/x/text v0.14.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20240227224415-6ceb2ff114de // indirect
+	golang.org/x/net v0.26.0 // indirect
+	golang.org/x/sys v0.21.0 // indirect
+	golang.org/x/text v0.16.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240604185151-ef581f913117 // indirect
 	gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -26,20 +26,20 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.8.3 h1:RP3t2pwF7cMEbC1dqtB6poj3niw/9gnV4Cjg5oW5gtY=
 github.com/stretchr/testify v1.8.3/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
-golang.org/x/net v0.21.0 h1:AQyQV4dYCvJ7vGmJyKki9+PBdyvhkSd8EIx/qb0AYv4=
-golang.org/x/net v0.21.0/go.mod h1:bIjVDfnllIU7BJ2DNgfnXvpSvtn8VRwhlsaeUTyUS44=
-golang.org/x/sync v0.6.0 h1:5BMeUDZ7vkXGfEr1x9B4bRcTH4lpkTkpdh0T/J+qjbQ=
-golang.org/x/sync v0.6.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
-golang.org/x/sys v0.17.0 h1:25cE3gD+tdBA7lp7QfhuV+rJiE9YXTcS3VG1SqssI/Y=
-golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
-golang.org/x/text v0.14.0 h1:ScX5w1eTa3QqT8oi6+ziP7dTV1S2+ALU0bI+0zXKWiQ=
-golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20240227224415-6ceb2ff114de h1:cZGRis4/ot9uVm639a+rHCUaG0JJHEsdyzSQTMX+suY=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20240227224415-6ceb2ff114de/go.mod h1:H4O17MA/PE9BsGx3w+a+W2VOLLD1Qf7oJneAoU6WktY=
-google.golang.org/grpc v1.63.2 h1:MUeiw1B2maTVZthpU5xvASfTh3LDbxHd6IJ6QQVU+xM=
-google.golang.org/grpc v1.63.2/go.mod h1:WAX/8DgncnokcFUldAxq7GeB5DXHDbMF+lLvDomNkRA=
-google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
-google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+golang.org/x/net v0.26.0 h1:soB7SVo0PWrY4vPW/+ay0jKDNScG2X9wFeYlXIvJsOQ=
+golang.org/x/net v0.26.0/go.mod h1:5YKkiSynbBIh3p6iOc/vibscux0x38BZDkn8sCUPxHE=
+golang.org/x/sync v0.7.0 h1:YsImfSBoP9QPYL0xyKJPq0gcaJdG3rInoqxTWbfQu9M=
+golang.org/x/sync v0.7.0/go.mod h1:Czt+wKu1gCyEFDUtn0jG5QVvpJ6rzVqr5aXyt9drQfk=
+golang.org/x/sys v0.21.0 h1:rF+pYz3DAGSQAxAu1CbC7catZg4ebC4UIeIhKxBZvws=
+golang.org/x/sys v0.21.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/text v0.16.0 h1:a94ExnEXNtEwYLGJSIUxnWoxoRz/ZcCsV63ROupILh4=
+golang.org/x/text v0.16.0/go.mod h1:GhwF1Be+LQoKShO3cGOHzqOgRrGaYc9AvblQOmPVHnI=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240604185151-ef581f913117 h1:1GBuWVLM/KMVUv1t1En5Gs+gFZCNd360GGb4sSxtrhU=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240604185151-ef581f913117/go.mod h1:EfXuqaE1J41VCDicxHzUDm+8rk+7ZdXzHV0IhO/I6s0=
+google.golang.org/grpc v1.66.2 h1:3QdXkuq3Bkh7w+ywLdLvM56cmGvQHUMZpiCzt6Rqaoo=
+google.golang.org/grpc v1.66.2/go.mod h1:s3/l6xSSCURdVfAnL+TqCNMyTDAGN6+lZeVxnZR128Y=
+google.golang.org/protobuf v1.34.1 h1:9ddQBjfCyZPOHPUiPxpYESBLc+T8P3E+Vo4IbKZgFWg=
+google.golang.org/protobuf v1.34.1/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
 gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=

rpc/client/call_options.go

@@ -2,13 +2,16 @@ package client
 
 import (
 	"context"
+
+	"google.golang.org/grpc"
 )
 
 // CallOption is a messaging session option within Protobuf RPC.
 type CallOption func(*callParameters)
 
 type callParameters struct {
-	ctx context.Context // nolint:containedctx
+	ctx    context.Context // nolint:containedctx
+	dialer func(context.Context, grpc.ClientConnInterface) error
 }
 
 func defaultCallParameters() *callParameters {
@@ -27,3 +30,11 @@ func WithContext(ctx context.Context) CallOption {
 		prm.ctx = ctx
 	}
 }
+
+// WithDialer returns option to specify grpc dialer. If passed, it will be
+// called after the connection is successfully created.
+func WithDialer(dialer func(context.Context, grpc.ClientConnInterface) error) CallOption {
+	return func(prm *callParameters) {
+		prm.dialer = dialer
+	}
+}

rpc/client/connect.go

@@ -12,7 +12,7 @@ import (
 
 var errInvalidEndpoint = errors.New("invalid endpoint options")
 
-func (c *Client) openGRPCConn(ctx context.Context) error {
+func (c *Client) openGRPCConn(ctx context.Context, dialer func(ctx context.Context, cc grpcstd.ClientConnInterface) error) error {
 	if c.conn != nil {
 		return nil
 	}
@@ -21,15 +21,21 @@ func (c *Client) openGRPCConn(ctx context.Context) error {
 		return errInvalidEndpoint
 	}
 
-	dialCtx, cancel := context.WithTimeout(ctx, c.dialTimeout)
 	var err error
 
-	c.conn, err = grpcstd.DialContext(dialCtx, c.addr, c.grpcDialOpts...)
-
-	cancel()
-
+	c.conn, err = grpcstd.NewClient(c.addr, c.grpcDialOpts...)
 	if err != nil {
-		return fmt.Errorf("gRPC dial: %w", err)
+		return fmt.Errorf("gRPC new client: %w", err)
+	}
+
+	if dialer != nil {
+		ctx, cancel := context.WithTimeout(ctx, c.dialTimeout)
+		defer cancel()
+
+		if err := dialer(ctx, c.conn); err != nil {
+			_ = c.conn.Close()
+			return fmt.Errorf("gRPC dial: %w", err)
+		}
 	}
 
 	return nil

rpc/client/init.go

@@ -46,7 +46,7 @@ func (c *Client) Init(info common.CallMethodInfo, opts ...CallOption) (MessageRe
 		opt(prm)
 	}
 
-	if err := c.openGRPCConn(prm.ctx); err != nil {
+	if err := c.openGRPCConn(prm.ctx, prm.dialer); err != nil {
 		return nil, err
 	}
 

rpc/client/options.go

@@ -37,7 +37,6 @@ func (c *cfg) initDefault() {
 	c.dialTimeout = defaultDialTimeout
 	c.rwTimeout = defaultRWTimeout
 	c.grpcDialOpts = []grpc.DialOption{
-		grpc.WithBlock(),
 		grpc.WithTransportCredentials(insecure.NewCredentials()),
 	}
 }

status/status.go

@@ -63,6 +63,8 @@ const (
 	SignatureVerificationFail
 	// NodeUnderMaintenance is a local Code value for NODE_UNDER_MAINTENANCE status.
 	NodeUnderMaintenance
+	// InvalidArgument is a local Code value for INVALID_ARGUMENT status.
+	InvalidArgument
 )
 
 const (

util/proto/marshal_test.go

@@ -26,11 +26,34 @@ func nonZero[T protoInt]() T {
 
 func TestStableMarshalSingle(t *testing.T) {
 	t.Run("empty", func(t *testing.T) {
-		input := &generated.Primitives{}
-		require.Zero(t, input.StableSize())
+		t.Run("proto", func(t *testing.T) {
+			input := &generated.Primitives{}
+			require.Zero(t, input.StableSize())
 
-		r := input.MarshalProtobuf(nil)
-		require.Empty(t, r)
+			r := input.MarshalProtobuf(nil)
+			require.Empty(t, r)
+		})
+		t.Run("json", func(t *testing.T) {
+			input := &generated.Primitives{}
+			r, err := input.MarshalJSON()
+			require.NoError(t, err)
+			require.NotEmpty(t, r)
+
+			var actual test.Primitives
+			require.NoError(t, protojson.Unmarshal(r, &actual))
+
+			t.Run("protojson compatibility", func(t *testing.T) {
+				data, err := protojson.MarshalOptions{EmitUnpopulated: true}.Marshal(&actual)
+				require.NoError(t, err)
+				require.JSONEq(t, string(data), string(r))
+			})
+
+			var actualFrostfs generated.Primitives
+			require.NoError(t, actualFrostfs.UnmarshalJSON(r))
+			require.Equal(t, input, &actualFrostfs)
+
+			primitivesEqual(t, input, &actual)
+		})
 	})
 
 	marshalCases := []struct {
@@ -76,6 +99,12 @@ func TestStableMarshalSingle(t *testing.T) {
 				var actual test.Primitives
 				require.NoError(t, protojson.Unmarshal(r, &actual))
 
+				t.Run("protojson compatibility", func(t *testing.T) {
+					data, err := protojson.MarshalOptions{EmitUnpopulated: true}.Marshal(&actual)
+					require.NoError(t, err)
+					require.JSONEq(t, string(data), string(r))
+				})
+
 				var actualFrostfs generated.Primitives
 				require.NoError(t, actualFrostfs.UnmarshalJSON(r))
 				require.Equal(t, tc.input, &actualFrostfs)
@@ -88,6 +117,7 @@ func TestStableMarshalSingle(t *testing.T) {
 
 func primitivesEqual(t *testing.T, a *generated.Primitives, b *test.Primitives) {
 	// Compare each field directly, because proto-generated code has private fields.
+	require.Equal(t, len(a.FieldA), len(b.FieldA))
 	require.Equal(t, a.FieldA, b.FieldA)
 	require.Equal(t, a.FieldB, b.FieldB)
 	require.Equal(t, a.FieldC, b.FieldC)

util/protogen/internalgengo/json.go

@@ -59,6 +59,35 @@ func emitJSONUnmarshal(g *protogen.GeneratedFile, msg *protogen.Message) {
 	g.P("}")
 }
 
+func emitJSONParseInteger(g *protogen.GeneratedFile, ident string, method string, bitSize int, typ string) {
+	g.P("r := in.JsonNumber()")
+	g.P("n := r.String()")
+	g.P("v, err := ", strconvPackage.Ident(method), "(n, 10, ", bitSize, ")")
+	g.P("if err != nil {")
+	g.P("	in.AddError(err)")
+	g.P("	return")
+	g.P("}")
+	g.P(ident, " := ", typ, "(v)")
+}
+
+func emitJSONReadEnum(g *protogen.GeneratedFile, name string, enumType string) {
+	g.P(`switch v := in.Interface().(type) {
+	case string:
+		if vv, ok := `+enumType+`_value[v]; ok {
+			`+name+` = `+enumType+`(vv)
+			break
+		}
+		vv, err := `, strconvPackage.Ident("ParseInt"), `(v, 10, 32)
+		if err != nil {
+			in.AddError(err)
+			return
+		}
+		`+name+` = `+enumType+`(vv)
+	case float64:
+		`+name+` = `+enumType+`(v)
+	}`)
+}
+
 func emitJSONFieldRead(g *protogen.GeneratedFile, f *protogen.Field, name string) {
 	g.P("{")
 	defer g.P("}")
@@ -83,30 +112,20 @@ func emitJSONFieldRead(g *protogen.GeneratedFile, f *protogen.Field, name string
 
 		enumType := fieldType(g, f).String()
 		g.P("var parsedValue " + enumType)
-		g.P(`switch v := in.Interface().(type) {
-		case string:
-			if vv, ok := `+enumType+`_value[v]; ok {
-				parsedValue = `+enumType+`(vv)
-				break
-			}
-			vv, err := `, strconvPackage.Ident("ParseInt"), `(v, 10, 32)
-			if err != nil {
-				in.AddError(err)
-				return
-			}
-			parsedValue = `+enumType+`(vv)
-		case float64:
-			parsedValue = `+enumType+`(v)
-		}`)
+		emitJSONReadEnum(g, "parsedValue", enumType)
 		template = "%s = parsedValue"
 	case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind:
-		template = "%s = in.Int32()"
+		emitJSONParseInteger(g, "pv", "ParseInt", 32, "int32")
+		template = "%s = pv"
 	case protoreflect.Uint32Kind, protoreflect.Fixed32Kind:
-		template = "%s = in.Uint32()"
+		emitJSONParseInteger(g, "pv", "ParseUint", 32, "uint32")
+		template = "%s = pv"
 	case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
-		template = "%s = in.Int64()"
+		emitJSONParseInteger(g, "pv", "ParseInt", 64, "int64")
+		template = "%s = pv"
 	case protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
-		template = "%s = in.Uint64()"
+		emitJSONParseInteger(g, "pv", "ParseUint", 64, "uint64")
+		template = "%s = pv"
 	case protoreflect.FloatKind:
 		template = "%s = in.Float32()"
 	case protoreflect.DoubleKind:
@@ -114,7 +133,17 @@ func emitJSONFieldRead(g *protogen.GeneratedFile, f *protogen.Field, name string
 	case protoreflect.StringKind:
 		template = "%s = in.String()"
 	case protoreflect.BytesKind:
-		template = "%s = in.Bytes()"
+		// Since some time ago proto3 support optional keyword, thus the presence is not tracked by default:
+		// https://github.com/protocolbuffers/protobuf-go/blob/fb995f184a1719ec42b247a3771d1036d92adf67/internal/impl/message_reflect_field.go#L327
+		// We do not explicitly support `optional` keyword, protoc will fail on such fileds.
+		// Thus, treat empty string as `[]byte(nil)`.
+		template = `{
+			tmp := in.Bytes()
+			if len(tmp) == 0 {
+				tmp = nil
+			}
+			%s = tmp
+		}`
 	case protoreflect.MessageKind:
 		if f.Desc.IsList() {
 			g.P("f = ", fieldType(g, f)[2:], "{}")
@@ -147,8 +176,11 @@ func emitJSONMarshal(g *protogen.GeneratedFile, msg *protogen.Message) {
 	g.P("func (x *", msg.GoIdent.GoName, ") MarshalEasyJSON(out *", jwriterPackage.Ident("Writer"), ") {")
 	g.P(`if x == nil { out.RawString("null"); return }`)
 
+	if len(msg.Fields) != 0 {
+		g.P("first := true")
+	}
 	g.P("out.RawByte('{')")
-	for i, f := range msg.Fields {
+	for _, f := range msg.Fields {
 		if f.Oneof != nil {
 			if f.Oneof.Fields[0] != f {
 				continue
@@ -157,29 +189,38 @@ func emitJSONMarshal(g *protogen.GeneratedFile, msg *protogen.Message) {
 			g.P("switch xx := x.", f.Oneof.GoName, ".(type) {")
 			for _, ff := range f.Oneof.Fields {
 				g.P("case *", ff.GoIdent, ":")
-				emitJSONFieldWrite(g, ff, "xx", i == 0)
+				emitJSONFieldWrite(g, ff, "xx")
 			}
 			g.P("}")
 			continue
 		}
-		emitJSONFieldWrite(g, f, "x", i == 0)
+		emitJSONFieldWrite(g, f, "x")
 	}
 	g.P("out.RawByte('}')")
 	g.P("}")
 }
 
-func emitJSONFieldWrite(g *protogen.GeneratedFile, f *protogen.Field, name string, first bool) {
+func emitJSONFieldWrite(g *protogen.GeneratedFile, f *protogen.Field, name string) {
 	g.P("{")
 	defer g.P("}")
 
-	g.P("const prefix string = ", `",\"`, fieldJSONName(f), `\":"`)
-	if first {
-		g.P("out.RawString(prefix[1:])")
-	} else {
-		g.P("out.RawString(prefix)")
-	}
-
 	selector := name + "." + f.GoName
+
+	// This code is responsible for ignoring default values.
+	// We will restore it after having parametrized JSON marshaling.
+	//
+	// isNotDefault := notNil
+	// if f.Desc.IsList() {
+	// 	isNotDefault = notEmpty
+	// } else if f.Desc.Kind() != protoreflect.MessageKind {
+	// 	_, isNotDefault = easyprotoKindInfo(f.Desc.Kind())
+	// }
+	// g.P("if ", isNotDefault(selector), "{")
+	// defer g.P("}")
+
+	g.P("if !first { out.RawByte(','); } else { first = false; }")
+	g.P("const prefix string = ", `"\"`, fieldJSONName(f), `\":"`)
+	g.P("out.RawString(prefix)")
 	if f.Desc.IsList() {
 		selector += "[i]"
 		g.P("out.RawByte('[')")
@@ -195,15 +236,27 @@ func emitJSONFieldWrite(g *protogen.GeneratedFile, f *protogen.Field, name strin
 	case protoreflect.BoolKind:
 		template = "out.Bool(%s)"
 	case protoreflect.EnumKind:
-		template = "out.Int32(int32(%s))"
+		enumType := fieldType(g, f).String()
+		template = `v := int32(%s)
+			if vv, ok := ` + enumType + `_name[v]; ok {
+				out.String(vv)
+			} else {
+				out.Int32(v)
+			}`
 	case protoreflect.Int32Kind, protoreflect.Sint32Kind, protoreflect.Sfixed32Kind:
 		template = "out.Int32(%s)"
 	case protoreflect.Uint32Kind, protoreflect.Fixed32Kind:
 		template = "out.Uint32(%s)"
 	case protoreflect.Int64Kind, protoreflect.Sint64Kind, protoreflect.Sfixed64Kind:
-		template = "out.Int64(%s)"
+		g.P("out.RawByte('\"')")
+		g.P("out.Buffer.Buf = ", strconvPackage.Ident("AppendInt"), "(out.Buffer.Buf, ", selector, ", 10)")
+		g.P("out.RawByte('\"')")
+		return
 	case protoreflect.Uint64Kind, protoreflect.Fixed64Kind:
-		template = "out.Uint64(%s)"
+		g.P("out.RawByte('\"')")
+		g.P("out.Buffer.Buf = ", strconvPackage.Ident("AppendUint"), "(out.Buffer.Buf, ", selector, ", 10)")
+		g.P("out.RawByte('\"')")
+		return
 	case protoreflect.FloatKind:
 		template = "out.Float32(%s)"
 	case protoreflect.DoubleKind:
@@ -211,7 +264,10 @@ func emitJSONFieldWrite(g *protogen.GeneratedFile, f *protogen.Field, name strin
 	case protoreflect.StringKind:
 		template = "out.String(%s)"
 	case protoreflect.BytesKind:
-		template = "out.Base64Bytes(%s)"
+		g.P("if ", selector, "!= nil {")
+		g.P("out.Base64Bytes(", selector, ")")
+		g.P("} else { out.String(\"\") }")
+		return
 	case protoreflect.MessageKind:
 		template = "%s.MarshalEasyJSON(out)"
 	case protoreflect.GroupKind: