最近在学习rpc，protoc生成go文件时遇到报错。
例子所用的proto文件如下：
syntax = "proto3";
package geecachepb;
message Request {
string group = 1;
string key = 2;
}
message Response {
bytes value = 1;
}
service GroupCache {
rpc Get(Request) returns (Response);
}
运行protoc命令时报错如下：
根据报错信息，解决方案如下：
syntax = "proto3";
package geecachepb;
option go_package = "./"; // 指定生成的go文件所在path
message Request {
string group = 1;
string key = 2;
}
message Response {
bytes value = 1;
}
service GroupCache {
rpc Get(Request) returns (Response);
}
再次运行protoc命令，成功：
对应的pb.go文件如下：
// Code generated by protoc-gen-go. DO NOT EDIT.
// versions:
// protoc-gen-go v1.26.0
// protoc v3.19.4
// source: geecachepb.proto
package __
import (
protoreflect "google.golang.org/protobuf/reflect/protoreflect"
protoimpl "google.golang.org/protobuf/runtime/protoimpl"
reflect "reflect"
sync "sync"
)
const (
// Verify that this generated code is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
// Verify that runtime/protoimpl is sufficiently up-to-date.
_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
)
type Request struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Group string `protobuf:"bytes,1,opt,name=group,proto3" json:"group,omitempty"`
Key string `protobuf:"bytes,2,opt,name=key,proto3" json:"key,omitempty"`
}
func (x *Request) Reset() {
*x = Request{}
if protoimpl.UnsafeEnabled {
mi := &file_geecachepb_proto_msgTypes[0]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *Request) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*Request) ProtoMessage() {}
func (x *Request) ProtoReflect() protoreflect.Message {
mi := &file_geecachepb_proto_msgTypes[0]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use Request.ProtoReflect.Descriptor instead.
func (*Request) Descriptor() ([]byte, []int) {
return file_geecachepb_proto_rawDescGZIP(), []int{0}
}
func (x *Request) GetGroup() string {
if x != nil {
return x.Group
}
return ""
}
func (x *Request) GetKey() string {
if x != nil {
return x.Key
}
return ""
}
type Response struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Value []byte `protobuf:"bytes,1,opt,name=value,proto3" json:"value,omitempty"`
}
func (x *Response) Reset() {
*x = Response{}
if protoimpl.UnsafeEnabled {
mi := &file_geecachepb_proto_msgTypes[1]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *Response) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*Response) ProtoMessage() {}
func (x *Response) ProtoReflect() protoreflect.Message {
mi := &file_geecachepb_proto_msgTypes[1]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use Response.ProtoReflect.Descriptor instead.
func (*Response) Descriptor() ([]byte, []int) {
return file_geecachepb_proto_rawDescGZIP(), []int{1}
}
func (x *Response) GetValue() []byte {
if x != nil {
return x.Value
}
return nil
}
var File_geecachepb_proto protoreflect.FileDescriptor
var file_geecachepb_proto_rawDesc = []byte{
0x0a, 0x10, 0x67, 0x65, 0x65, 0x63, 0x61, 0x63, 0x68, 0x65, 0x70, 0x62, 0x2e, 0x70, 0x72, 0x6f,
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0x33,
}
var (
file_geecachepb_proto_rawDescOnce sync.Once
file_geecachepb_proto_rawDescData = file_geecachepb_proto_rawDesc
)
func file_geecachepb_proto_rawDescGZIP() []byte {
file_geecachepb_proto_rawDescOnce.Do(func() {
file_geecachepb_proto_rawDescData = protoimpl.X.CompressGZIP(file_geecachepb_proto_rawDescData)
})
return file_geecachepb_proto_rawDescData
}
var file_geecachepb_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
var file_geecachepb_proto_goTypes = []interface{}{
(*Request)(nil), // 0: geecachepb.Request
(*Response)(nil), // 1: geecachepb.Response
}
var file_geecachepb_proto_depIdxs = []int32{
0, // 0: geecachepb.GroupCache.Get:input_type -> geecachepb.Request
1, // 1: geecachepb.GroupCache.Get:output_type -> geecachepb.Response
1, // [1:2] is the sub-list for method output_type
0, // [0:1] is the sub-list for method input_type
0, // [0:0] is the sub-list for extension type_name
0, // [0:0] is the sub-list for extension extendee
0, // [0:0] is the sub-list for field type_name
}
func init() { file_geecachepb_proto_init() }
func file_geecachepb_proto_init() {
if File_geecachepb_proto != nil {
return
}
if !protoimpl.UnsafeEnabled {
file_geecachepb_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*Request); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
file_geecachepb_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*Response); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
}
type x struct{}
out := protoimpl.TypeBuilder{
File: protoimpl.DescBuilder{
GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
RawDescriptor: file_geecachepb_proto_rawDesc,
NumEnums: 0,
NumMessages: 2,
NumExtensions: 0,
NumServices: 1,
},
GoTypes: file_geecachepb_proto_goTypes,
DependencyIndexes: file_geecachepb_proto_depIdxs,
MessageInfos: file_geecachepb_proto_msgTypes,
}.Build()
File_geecachepb_proto = out.File
file_geecachepb_proto_rawDesc = nil
file_geecachepb_proto_goTypes = nil
file_geecachepb_proto_depIdxs = nil
}
参考文档：go语言protoc编译问题-protoc-gen-go: unable to determine Go import path for “searchnode.proto“