【发布时间】：2020-03-04 18:19:57
【问题描述】：
考虑以下示例项目，其 Go 模块 github.com/kurtpeek/proto-example 和以下目录结构（.proto 文件位于 proto 目录中，生成的 Go 代码位于 gen/go 中）：
.
├── gen
│ └── go
│ ├── author
│ │ └── author.pb.go
│ └── book
│ └── book.pb.go
├── go.mod
├── go.sum
├── main.go
└── proto
├── author
│ └── author.proto
└── book
└── book.proto
这里author.proto 阅读
syntax="proto3";
package author;
message Author {
string name = 1;
}
而book.proto 像这样导入author.proto：
syntax="proto3";
package book;
import "author/author.proto";
message Book {
string title = 1;
author.Author author = 2;
}
我已经生成了.pb.go 文件，在proto/ 目录中运行
protoc book/book.proto --go_out=../gen/go
和
protoc author/author.proto --go_out=../gen/go
问题是author在book.pb.go中导入的包名就是"author"：
// Code generated by protoc-gen-go. DO NOT EDIT.
// source: book/book.proto
package book
import (
author "author"
fmt "fmt"
proto "github.com/golang/protobuf/proto"
math "math"
)
// Reference imports to suppress errors if they are not otherwise used.
var _ = proto.Marshal
var _ = fmt.Errorf
var _ = math.Inf
// This is a compile-time assertion to ensure that this generated file
// is compatible with the proto package it is being compiled against.
// A compilation error at this line likely means your copy of the
// proto package needs to be updated.
const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
type Book struct {
Title string `protobuf:"bytes,1,opt,name=title,proto3" json:"title,omitempty"`
Author *author.Author `protobuf:"bytes,2,opt,name=author,proto3" json:"author,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *Book) Reset() { *m = Book{} }
func (m *Book) String() string { return proto.CompactTextString(m) }
func (*Book) ProtoMessage() {}
func (*Book) Descriptor() ([]byte, []int) {
return fileDescriptor_ee9082fb44230b1b, []int{0}
}
func (m *Book) XXX_Unmarshal(b []byte) error {
return xxx_messageInfo_Book.Unmarshal(m, b)
}
func (m *Book) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
return xxx_messageInfo_Book.Marshal(b, m, deterministic)
}
func (m *Book) XXX_Merge(src proto.Message) {
xxx_messageInfo_Book.Merge(m, src)
}
func (m *Book) XXX_Size() int {
return xxx_messageInfo_Book.Size(m)
}
func (m *Book) XXX_DiscardUnknown() {
xxx_messageInfo_Book.DiscardUnknown(m)
}
var xxx_messageInfo_Book proto.InternalMessageInfo
func (m *Book) GetTitle() string {
if m != nil {
return m.Title
}
return ""
}
func (m *Book) GetAuthor() *author.Author {
if m != nil {
return m.Author
}
return nil
}
func init() {
proto.RegisterType((*Book)(nil), "book.Book")
}
func init() { proto.RegisterFile("book/book.proto", fileDescriptor_ee9082fb44230b1b) }
var fileDescriptor_ee9082fb44230b1b = []byte{
// 108 bytes of a gzipped FileDescriptorProto
0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0xe2, 0x4f, 0xca, 0xcf, 0xcf,
0xd6, 0x07, 0x11, 0x7a, 0x05, 0x45, 0xf9, 0x25, 0xf9, 0x42, 0x2c, 0x20, 0xb6, 0x94, 0x70, 0x62,
0x69, 0x49, 0x46, 0x7e, 0x91, 0x3e, 0x84, 0x82, 0x48, 0x29, 0xb9, 0x70, 0xb1, 0x38, 0xe5, 0xe7,
0x67, 0x0b, 0x89, 0x70, 0xb1, 0x96, 0x64, 0x96, 0xe4, 0xa4, 0x4a, 0x30, 0x2a, 0x30, 0x6a, 0x70,
0x06, 0x41, 0x38, 0x42, 0x6a, 0x5c, 0x6c, 0x10, 0xd5, 0x12, 0x4c, 0x0a, 0x8c, 0x1a, 0xdc, 0x46,
0x7c, 0x7a, 0x50, 0xcd, 0x8e, 0x60, 0x2a, 0x08, 0x2a, 0x9b, 0xc4, 0x06, 0x36, 0xcc, 0x18, 0x10,
0x00, 0x00, 0xff, 0xff, 0x2c, 0x89, 0x1f, 0x45, 0x7a, 0x00, 0x00, 0x00,
}
我希望生成的 go 代码使用正确的包名相互导入，这样book.pb.go 就会像这样开始：
package book
import (
fmt "fmt"
math "math"
proto "github.com/golang/protobuf/proto"
author "github.com/kurtpeek/proto-example/gen/go/author"
)
如何让 Protobuf 编译器“感知”生成代码所在的 Go 模块？
（我怀疑我需要指定option go_package（参见https://developers.google.com/protocol-buffers/docs/gotutorial），但这样做似乎不会改变生成的代码）。
【问题讨论】：
标签： go protocol-buffers go-modules protoc