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reflect/protodesc: add functions to convert descs to protos
Add a collection of functions which take a reflect.*Descriptor and return the corresponding google.protobuf.*DescriptorProto. Change-Id: Ic186c412c8d3b7bc582c31bb8d8274459ce51a20 Reviewed-on: https://go-review.googlesource.com/c/159761 Reviewed-by: Herbie Ong <herbie@google.com> Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
This commit is contained in:
Damien Neil
parent
8012b444ee
commit
f14380bd8a
212
reflect/protodesc/toproto.go
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212
reflect/protodesc/toproto.go
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@ -0,0 +1,212 @@
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// 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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"github.com/golang/protobuf/v2/internal/encoding/defval"
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"github.com/golang/protobuf/v2/internal/scalar"
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"github.com/golang/protobuf/v2/reflect/protoreflect"
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descriptorpb "github.com/golang/protobuf/v2/types/descriptor"
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)
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// ToFileDescriptorProto converts a FileDescriptor to a
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// google.protobuf.FileDescriptorProto.
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func ToFileDescriptorProto(file protoreflect.FileDescriptor) *descriptorpb.FileDescriptorProto {
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p := &descriptorpb.FileDescriptorProto{
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Name: scalar.String(file.Path()),
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Package: scalar.String(string(file.Package())),
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// TODO: Clone options messages, or document this as aliasing.
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Options: file.Options().(*descriptorpb.FileOptions),
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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, 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 {
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p.Syntax = scalar.String(file.Syntax().String())
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}
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return p
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}
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// ToDescriptorProto converts a MessageDescriptor to a
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// google.protobuf.DescriptorProto.
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func ToDescriptorProto(message protoreflect.MessageDescriptor) *descriptorpb.DescriptorProto {
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p := &descriptorpb.DescriptorProto{
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Name: scalar.String(string(message.Name())),
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Options: 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: scalar.Int32(int32(xrange[0])),
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End: scalar.Int32(int32(xrange[1])),
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Options: 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: scalar.Int32(int32(rrange[0])),
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End: scalar.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 converts a FieldDescriptor to a
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// google.protobuf.FieldDescriptorProto.
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func ToFieldDescriptorProto(field protoreflect.FieldDescriptor) *descriptorpb.FieldDescriptorProto {
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p := &descriptorpb.FieldDescriptorProto{
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Name: scalar.String(string(field.Name())),
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Number: scalar.Int32(int32(field.Number())),
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Label: descriptorpb.FieldDescriptorProto_Label(field.Cardinality()).Enum(),
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Type: descriptorpb.FieldDescriptorProto_Type(field.Kind()).Enum(),
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Extendee: fullNameOf(field.ExtendedType()),
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Options: field.Options().(*descriptorpb.FieldOptions),
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}
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switch field.Kind() {
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case protoreflect.EnumKind:
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p.TypeName = fullNameOf(field.EnumType())
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case protoreflect.MessageKind, protoreflect.GroupKind:
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p.TypeName = fullNameOf(field.MessageType())
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}
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if field.HasJSONName() {
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p.JsonName = scalar.String(field.JSONName())
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}
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if field.HasDefault() {
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if field.Kind() == protoreflect.EnumKind {
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// TODO: defval.Marshal should probably take a FieldDescriptor
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// instead of a Kind and do this itself.
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p.DefaultValue = scalar.String(string(field.DefaultEnumValue().Name()))
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} else {
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def, err := defval.Marshal(field.Default(), field.Kind(), defval.Descriptor)
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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 = scalar.String(def)
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}
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}
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if oneof := field.OneofType(); oneof != nil {
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p.OneofIndex = scalar.Int32(int32(oneof.Index()))
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}
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return p
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}
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// ToOneofDescriptorProto converts a OneofDescriptor to a
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// google.protobuf.OneofDescriptorProto.
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func ToOneofDescriptorProto(oneof protoreflect.OneofDescriptor) *descriptorpb.OneofDescriptorProto {
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return &descriptorpb.OneofDescriptorProto{
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Name: scalar.String(string(oneof.Name())),
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Options: oneof.Options().(*descriptorpb.OneofOptions),
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}
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}
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// ToEnumDescriptorProto converts a EnumDescriptor to a
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// google.protobuf.EnumDescriptorProto.
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func ToEnumDescriptorProto(enum protoreflect.EnumDescriptor) *descriptorpb.EnumDescriptorProto {
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p := &descriptorpb.EnumDescriptorProto{
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Name: scalar.String(string(enum.Name())),
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Options: 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: scalar.Int32(int32(rrange[0])),
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End: scalar.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 converts a EnumValueDescriptor to a
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// google.protobuf.EnumValueDescriptorProto.
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func ToEnumValueDescriptorProto(value protoreflect.EnumValueDescriptor) *descriptorpb.EnumValueDescriptorProto {
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return &descriptorpb.EnumValueDescriptorProto{
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Name: scalar.String(string(value.Name())),
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Number: scalar.Int32(int32(value.Number())),
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Options: value.Options().(*descriptorpb.EnumValueOptions),
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}
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}
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// ToServiceDescriptorProto converts a ServiceDescriptor to a
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// google.protobuf.ServiceDescriptorProto.
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func ToServiceDescriptorProto(service protoreflect.ServiceDescriptor) *descriptorpb.ServiceDescriptorProto {
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p := &descriptorpb.ServiceDescriptorProto{
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Name: scalar.String(string(service.Name())),
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Options: 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 converts a MethodDescriptor to a
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// google.protobuf.MethodDescriptorProto.
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func ToMethodDescriptorProto(method protoreflect.MethodDescriptor) *descriptorpb.MethodDescriptorProto {
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p := &descriptorpb.MethodDescriptorProto{
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Name: scalar.String(string(method.Name())),
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InputType: fullNameOf(method.InputType()),
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OutputType: fullNameOf(method.OutputType()),
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Options: method.Options().(*descriptorpb.MethodOptions),
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}
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if method.IsStreamingClient() {
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p.ClientStreaming = scalar.Bool(true)
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}
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if method.IsStreamingServer() {
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p.ServerStreaming = scalar.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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return scalar.String("." + string(d.FullName()))
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}
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