275 lines
10 KiB
Go
275 lines
10 KiB
Go
// Copyright 2019 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package protodesc
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import (
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"fmt"
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"strings"
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"google.golang.org/protobuf/internal/encoding/defval"
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"google.golang.org/protobuf/internal/strs"
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"google.golang.org/protobuf/proto"
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"google.golang.org/protobuf/reflect/protoreflect"
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"google.golang.org/protobuf/types/descriptorpb"
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)
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// ToFileDescriptorProto copies a [protoreflect.FileDescriptor] into a
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// google.protobuf.FileDescriptorProto message.
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func ToFileDescriptorProto(file protoreflect.FileDescriptor) *descriptorpb.FileDescriptorProto {
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p := &descriptorpb.FileDescriptorProto{
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Name: proto.String(file.Path()),
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Options: proto.Clone(file.Options()).(*descriptorpb.FileOptions),
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}
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if file.Package() != "" {
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p.Package = proto.String(string(file.Package()))
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}
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for i, imports := 0, file.Imports(); i < imports.Len(); i++ {
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imp := imports.Get(i)
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p.Dependency = append(p.Dependency, imp.Path())
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if imp.IsPublic {
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p.PublicDependency = append(p.PublicDependency, int32(i))
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}
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if imp.IsWeak {
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p.WeakDependency = append(p.WeakDependency, int32(i))
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}
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}
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for i, locs := 0, file.SourceLocations(); i < locs.Len(); i++ {
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loc := locs.Get(i)
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l := &descriptorpb.SourceCodeInfo_Location{}
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l.Path = append(l.Path, loc.Path...)
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if loc.StartLine == loc.EndLine {
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l.Span = []int32{int32(loc.StartLine), int32(loc.StartColumn), int32(loc.EndColumn)}
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} else {
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l.Span = []int32{int32(loc.StartLine), int32(loc.StartColumn), int32(loc.EndLine), int32(loc.EndColumn)}
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}
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l.LeadingDetachedComments = append([]string(nil), loc.LeadingDetachedComments...)
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if loc.LeadingComments != "" {
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l.LeadingComments = proto.String(loc.LeadingComments)
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}
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if loc.TrailingComments != "" {
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l.TrailingComments = proto.String(loc.TrailingComments)
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}
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if p.SourceCodeInfo == nil {
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p.SourceCodeInfo = &descriptorpb.SourceCodeInfo{}
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}
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p.SourceCodeInfo.Location = append(p.SourceCodeInfo.Location, l)
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}
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for i, messages := 0, file.Messages(); i < messages.Len(); i++ {
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p.MessageType = append(p.MessageType, ToDescriptorProto(messages.Get(i)))
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}
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for i, enums := 0, file.Enums(); i < enums.Len(); i++ {
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p.EnumType = append(p.EnumType, ToEnumDescriptorProto(enums.Get(i)))
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}
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for i, services := 0, file.Services(); i < services.Len(); i++ {
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p.Service = append(p.Service, ToServiceDescriptorProto(services.Get(i)))
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}
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for i, exts := 0, file.Extensions(); i < exts.Len(); i++ {
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p.Extension = append(p.Extension, ToFieldDescriptorProto(exts.Get(i)))
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}
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if syntax := file.Syntax(); syntax != protoreflect.Proto2 && syntax.IsValid() {
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p.Syntax = proto.String(file.Syntax().String())
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}
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if file.Syntax() == protoreflect.Editions {
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desc := file
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if fileImportDesc, ok := file.(protoreflect.FileImport); ok {
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desc = fileImportDesc.FileDescriptor
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}
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if editionsInterface, ok := desc.(interface{ Edition() int32 }); ok {
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p.Edition = descriptorpb.Edition(editionsInterface.Edition()).Enum()
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}
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}
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return p
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}
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// ToDescriptorProto copies a [protoreflect.MessageDescriptor] into a
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// google.protobuf.DescriptorProto message.
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func ToDescriptorProto(message protoreflect.MessageDescriptor) *descriptorpb.DescriptorProto {
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p := &descriptorpb.DescriptorProto{
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Name: proto.String(string(message.Name())),
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Options: proto.Clone(message.Options()).(*descriptorpb.MessageOptions),
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}
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for i, fields := 0, message.Fields(); i < fields.Len(); i++ {
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p.Field = append(p.Field, ToFieldDescriptorProto(fields.Get(i)))
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}
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for i, exts := 0, message.Extensions(); i < exts.Len(); i++ {
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p.Extension = append(p.Extension, ToFieldDescriptorProto(exts.Get(i)))
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}
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for i, messages := 0, message.Messages(); i < messages.Len(); i++ {
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p.NestedType = append(p.NestedType, ToDescriptorProto(messages.Get(i)))
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}
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for i, enums := 0, message.Enums(); i < enums.Len(); i++ {
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p.EnumType = append(p.EnumType, ToEnumDescriptorProto(enums.Get(i)))
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}
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for i, xranges := 0, message.ExtensionRanges(); i < xranges.Len(); i++ {
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xrange := xranges.Get(i)
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p.ExtensionRange = append(p.ExtensionRange, &descriptorpb.DescriptorProto_ExtensionRange{
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Start: proto.Int32(int32(xrange[0])),
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End: proto.Int32(int32(xrange[1])),
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Options: proto.Clone(message.ExtensionRangeOptions(i)).(*descriptorpb.ExtensionRangeOptions),
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})
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}
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for i, oneofs := 0, message.Oneofs(); i < oneofs.Len(); i++ {
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p.OneofDecl = append(p.OneofDecl, ToOneofDescriptorProto(oneofs.Get(i)))
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}
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for i, ranges := 0, message.ReservedRanges(); i < ranges.Len(); i++ {
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rrange := ranges.Get(i)
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p.ReservedRange = append(p.ReservedRange, &descriptorpb.DescriptorProto_ReservedRange{
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Start: proto.Int32(int32(rrange[0])),
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End: proto.Int32(int32(rrange[1])),
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})
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}
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for i, names := 0, message.ReservedNames(); i < names.Len(); i++ {
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p.ReservedName = append(p.ReservedName, string(names.Get(i)))
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}
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return p
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}
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// ToFieldDescriptorProto copies a [protoreflect.FieldDescriptor] into a
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// google.protobuf.FieldDescriptorProto message.
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func ToFieldDescriptorProto(field protoreflect.FieldDescriptor) *descriptorpb.FieldDescriptorProto {
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p := &descriptorpb.FieldDescriptorProto{
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Name: proto.String(string(field.Name())),
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Number: proto.Int32(int32(field.Number())),
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Label: descriptorpb.FieldDescriptorProto_Label(field.Cardinality()).Enum(),
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Options: proto.Clone(field.Options()).(*descriptorpb.FieldOptions),
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}
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if field.IsExtension() {
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p.Extendee = fullNameOf(field.ContainingMessage())
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}
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if field.Kind().IsValid() {
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p.Type = descriptorpb.FieldDescriptorProto_Type(field.Kind()).Enum()
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}
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if field.Enum() != nil {
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p.TypeName = fullNameOf(field.Enum())
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}
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if field.Message() != nil {
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p.TypeName = fullNameOf(field.Message())
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}
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if field.HasJSONName() {
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// A bug in older versions of protoc would always populate the
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// "json_name" option for extensions when it is meaningless.
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// When it did so, it would always use the camel-cased field name.
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if field.IsExtension() {
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p.JsonName = proto.String(strs.JSONCamelCase(string(field.Name())))
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} else {
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p.JsonName = proto.String(field.JSONName())
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}
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}
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if field.Syntax() == protoreflect.Proto3 && field.HasOptionalKeyword() {
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p.Proto3Optional = proto.Bool(true)
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}
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if field.Syntax() == protoreflect.Editions {
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// Editions have no group keyword, this type is only set so that downstream users continue
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// treating this as delimited encoding.
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if p.GetType() == descriptorpb.FieldDescriptorProto_TYPE_GROUP {
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p.Type = descriptorpb.FieldDescriptorProto_TYPE_MESSAGE.Enum()
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}
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// Editions have no required keyword, this label is only set so that downstream users continue
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// treating it as required.
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if p.GetLabel() == descriptorpb.FieldDescriptorProto_LABEL_REQUIRED {
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p.Label = descriptorpb.FieldDescriptorProto_LABEL_OPTIONAL.Enum()
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}
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}
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if field.HasDefault() {
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def, err := defval.Marshal(field.Default(), field.DefaultEnumValue(), field.Kind(), defval.Descriptor)
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if err != nil && field.DefaultEnumValue() != nil {
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def = string(field.DefaultEnumValue().Name()) // occurs for unresolved enum values
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} else if err != nil {
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panic(fmt.Sprintf("%v: %v", field.FullName(), err))
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}
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p.DefaultValue = proto.String(def)
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}
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if oneof := field.ContainingOneof(); oneof != nil {
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p.OneofIndex = proto.Int32(int32(oneof.Index()))
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}
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return p
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}
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// ToOneofDescriptorProto copies a [protoreflect.OneofDescriptor] into a
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// google.protobuf.OneofDescriptorProto message.
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func ToOneofDescriptorProto(oneof protoreflect.OneofDescriptor) *descriptorpb.OneofDescriptorProto {
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return &descriptorpb.OneofDescriptorProto{
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Name: proto.String(string(oneof.Name())),
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Options: proto.Clone(oneof.Options()).(*descriptorpb.OneofOptions),
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}
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}
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// ToEnumDescriptorProto copies a [protoreflect.EnumDescriptor] into a
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// google.protobuf.EnumDescriptorProto message.
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func ToEnumDescriptorProto(enum protoreflect.EnumDescriptor) *descriptorpb.EnumDescriptorProto {
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p := &descriptorpb.EnumDescriptorProto{
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Name: proto.String(string(enum.Name())),
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Options: proto.Clone(enum.Options()).(*descriptorpb.EnumOptions),
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}
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for i, values := 0, enum.Values(); i < values.Len(); i++ {
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p.Value = append(p.Value, ToEnumValueDescriptorProto(values.Get(i)))
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}
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for i, ranges := 0, enum.ReservedRanges(); i < ranges.Len(); i++ {
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rrange := ranges.Get(i)
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p.ReservedRange = append(p.ReservedRange, &descriptorpb.EnumDescriptorProto_EnumReservedRange{
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Start: proto.Int32(int32(rrange[0])),
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End: proto.Int32(int32(rrange[1])),
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})
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}
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for i, names := 0, enum.ReservedNames(); i < names.Len(); i++ {
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p.ReservedName = append(p.ReservedName, string(names.Get(i)))
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}
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return p
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}
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// ToEnumValueDescriptorProto copies a [protoreflect.EnumValueDescriptor] into a
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// google.protobuf.EnumValueDescriptorProto message.
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func ToEnumValueDescriptorProto(value protoreflect.EnumValueDescriptor) *descriptorpb.EnumValueDescriptorProto {
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return &descriptorpb.EnumValueDescriptorProto{
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Name: proto.String(string(value.Name())),
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Number: proto.Int32(int32(value.Number())),
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Options: proto.Clone(value.Options()).(*descriptorpb.EnumValueOptions),
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}
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}
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// ToServiceDescriptorProto copies a [protoreflect.ServiceDescriptor] into a
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// google.protobuf.ServiceDescriptorProto message.
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func ToServiceDescriptorProto(service protoreflect.ServiceDescriptor) *descriptorpb.ServiceDescriptorProto {
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p := &descriptorpb.ServiceDescriptorProto{
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Name: proto.String(string(service.Name())),
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Options: proto.Clone(service.Options()).(*descriptorpb.ServiceOptions),
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}
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for i, methods := 0, service.Methods(); i < methods.Len(); i++ {
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p.Method = append(p.Method, ToMethodDescriptorProto(methods.Get(i)))
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}
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return p
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}
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// ToMethodDescriptorProto copies a [protoreflect.MethodDescriptor] into a
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// google.protobuf.MethodDescriptorProto message.
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func ToMethodDescriptorProto(method protoreflect.MethodDescriptor) *descriptorpb.MethodDescriptorProto {
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p := &descriptorpb.MethodDescriptorProto{
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Name: proto.String(string(method.Name())),
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InputType: fullNameOf(method.Input()),
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OutputType: fullNameOf(method.Output()),
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Options: proto.Clone(method.Options()).(*descriptorpb.MethodOptions),
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}
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if method.IsStreamingClient() {
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p.ClientStreaming = proto.Bool(true)
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}
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if method.IsStreamingServer() {
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p.ServerStreaming = proto.Bool(true)
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}
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return p
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}
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func fullNameOf(d protoreflect.Descriptor) *string {
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if d == nil {
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return nil
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}
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if strings.HasPrefix(string(d.FullName()), unknownPrefix) {
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return proto.String(string(d.FullName()[len(unknownPrefix):]))
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}
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return proto.String("." + string(d.FullName()))
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}
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