package main import ( "sort" "strings" "google.golang.org/protobuf/compiler/protogen" "google.golang.org/protobuf/reflect/protoreflect" ) func main() { protogen.Options{}.Run(func(gen *protogen.Plugin) error { for _, f := range gen.Files { //if !f.Generate { // continue //} imp := string(f.GoImportPath) if strings.HasSuffix(imp, "/tree") || strings.HasSuffix(imp, "/control") { generateFile(gen, f) } } return nil }) } // generateFile generates a *.pb.go file enforcing field-order serialization. func generateFile(gen *protogen.Plugin, file *protogen.File) *protogen.GeneratedFile { filename := file.GeneratedFilenamePrefix + "_frostfs.pb.go" g := gen.NewGeneratedFile(filename, file.GoImportPath) g.P("// Code generated by protoc-gen-go-frostfs. DO NOT EDIT.") g.P() g.P("package ", file.GoPackageName) g.P() g.P(`import "github.com/TrueCloudLab/frostfs-api-go/v2/util/proto"`) //for _, e := range file.Enums { // g.P("type " + e.GoIdent.GoName + " int32") // g.P("const (") // for _, ev := range e.Values { // g.P(ev.GoIdent.GoName, " = ", ev.Desc.Number()) // } // g.P(")") //} for _, msg := range file.Messages { emitMessage(g, msg) } return g } func emitMessage(g *protogen.GeneratedFile, msg *protogen.Message) { for _, inner := range msg.Messages { emitMessage(g, inner) } fs := sortFields(msg.Fields) // StableSize implementation. g.P("// StableSize returns the size of x in protobuf format.") g.P("//") g.P("// Structures with the same field values have the same binary size.") g.P("func (x *", msg.GoIdent.GoName, ") StableSize() (size int) {") if len(fs) != 0 { for _, f := range fs { if f.Desc.IsList() && marshalers[f.Desc.Kind()].RepeatedDouble { g.P("var n int") break } } for _, f := range fs { emitFieldSize(g, f) } } g.P("return size") g.P("}\n") // StableMarshal implementation. g.P("// StableMarshal marshals x in protobuf binary format with stable field order.") g.P("//") g.P("// If buffer length is less than x.StableSize(), new buffer is allocated.") g.P("//") g.P("// Returns any error encountered which did not allow writing the data completely.") g.P("// Otherwise, returns the buffer in which the data is written.") g.P("//") g.P("// Structures with the same field values have the same binary format.") g.P("func (x *", msg.GoIdent.GoName, ") StableMarshal(buf []byte) []byte {") if len(fs) != 0 { g.P("if x == nil { return []byte{} }") g.P("if buf == nil { buf = make([]byte, x.StableSize()) }") g.P("var offset int") for _, f := range fs { emitFieldMarshal(g, f) } } g.P("return buf") g.P("}\n") if strings.HasSuffix(msg.GoIdent.GoName, "Request") || strings.HasSuffix(msg.GoIdent.GoName, "Response") { // SignedDataSize implementation (only for requests and responses). g.P("// ReadSignedData fills buf with signed data of x.") g.P("// If buffer length is less than x.SignedDataSize(), new buffer is allocated.") g.P("//") g.P("// Returns any error encountered which did not allow writing the data completely.") g.P("// Otherwise, returns the buffer in which the data is written.") g.P("//") g.P("// Structures with the same field values have the same signed data.") g.P("func (x *", msg.GoIdent.GoName, ") SignedDataSize() int {") g.P("return x.GetBody().StableSize()") g.P("}\n") // ReadSignedData implementation (only for requests and responses). g.P("// SignedDataSize returns size of the request signed data in bytes.") g.P("//") g.P("// Structures with the same field values have the same signed data size.") g.P("func (x *", msg.GoIdent.GoName, ") ReadSignedData(buf []byte) ([]byte, error) {") g.P("return x.GetBody().StableMarshal(buf), nil") g.P("}\n") // Signature setters and getters. g.P("func (x *", msg.GoIdent.GoName, ") SetSignature(sig *Signature) {") g.P("x.Signature = sig") g.P("}\n") } } func emitFieldSize(g *protogen.GeneratedFile, f *protogen.Field) { m := marshalers[f.Desc.Kind()] if m.Prefix == "" { g.P("// FIXME missing field marshaler: ", f.GoName, " of type ", f.Desc.Kind().String()) g.P(`panic("unimplemented")`) return } name := castFieldName(f) if f.Oneof != nil { name = "x." + f.Oneof.GoName g.P("if inner, ok := ", name, ".(*", f.GoIdent.GoName, "); ok {") defer g.P("}") name = "inner." + f.GoName } switch { case f.Desc.IsList() && f.Desc.Kind() == protoreflect.MessageKind: g.P("for i := range ", name, "{") g.P("size += proto.NestedStructureSize(", f.Desc.Number(), ", ", name, "[i])") g.P("}") case f.Desc.IsList(): if m.RepeatedDouble { g.P("n, _ = proto.Repeated", m.Prefix, "Size(", f.Desc.Number(), ", ", name, ")") g.P("size += n") } else { g.P("size += proto.Repeated", m.Prefix, "Size(", f.Desc.Number(), ", ", name, ")") } default: g.P("size += proto.", m.Prefix, "Size(", f.Desc.Number(), ", ", name, ")") } } func emitFieldMarshal(g *protogen.GeneratedFile, f *protogen.Field) { m := marshalers[f.Desc.Kind()] if m.Prefix == "" { g.P("// FIXME missing field marshaler: ", f.GoName, " of type ", f.Desc.Kind().String()) g.P(`panic("unimplemented")`) return } name := castFieldName(f) if f.Oneof != nil { name = "x." + f.Oneof.GoName g.P("if inner, ok := ", name, ".(*", f.GoIdent.GoName, "); ok {") defer g.P("}") name = "inner." + f.GoName } prefix := m.Prefix if f.Desc.IsList() { prefix = "Repeated" + m.Prefix } switch { case f.Desc.IsList() && f.Desc.Kind() == protoreflect.MessageKind: g.P("for i := range ", name, "{") g.P("offset += proto.NestedStructureMarshal(", f.Desc.Number(), ", buf[offset:], ", name, "[i])") g.P("}") case f.Desc.IsList(): g.P("offset += proto.Repeated", m.Prefix, "Marshal(", f.Desc.Number(), ", buf[offset:], ", name, ")") default: g.P("offset += proto.", prefix, "Marshal(", f.Desc.Number(), ", buf[offset:], ", name, ")") } } func castFieldName(f *protogen.Field) string { name := "x." + f.GoName if f.Desc.Kind() != protoreflect.EnumKind { return name } return "int32(" + name + ")" } type marshalerDesc struct { Prefix string RepeatedDouble bool } // Unused kinds are commented. var marshalers = map[protoreflect.Kind]marshalerDesc{ protoreflect.BoolKind: {Prefix: "Bool"}, protoreflect.EnumKind: {Prefix: "Enum"}, //protoreflect.Int32Kind: "", //protoreflect.Sint32Kind: "", protoreflect.Uint32Kind: {Prefix: "UInt32", RepeatedDouble: true}, protoreflect.Int64Kind: {Prefix: "Int64", RepeatedDouble: true}, //protoreflect.Sint64Kind: "", protoreflect.Uint64Kind: {Prefix: "UInt64", RepeatedDouble: true}, //protoreflect.Sfixed32Kind: "", protoreflect.Fixed32Kind: {Prefix: "Fixed32", RepeatedDouble: true}, //protoreflect.FloatKind: "", //protoreflect.Sfixed64Kind: "", protoreflect.Fixed64Kind: {Prefix: "Fixed64", RepeatedDouble: true}, protoreflect.DoubleKind: {Prefix: "Float64"}, protoreflect.StringKind: {Prefix: "String"}, protoreflect.BytesKind: {Prefix: "Bytes"}, protoreflect.MessageKind: {Prefix: "NestedStructure"}, //protoreflect.GroupKind: "", } func sortFields(fs []*protogen.Field) []*protogen.Field { res := make([]*protogen.Field, len(fs)) copy(res, fs) sort.Slice(res, func(i, j int) bool { return res[i].Desc.Number() < res[j].Desc.Number() }) return res }