go protobuf:找不到包“。在github.com/gogo/protobuf/proto和m.TimeStamp.MarshalToSizedBuffer中未定义

Question

按标题提问。我试着用gogoproto和golangprotobuf两种方式编译。

为这两个都写了测试，两个都不会编组。

msg.proto

syntax = "proto3";

import "google/protobuf/timestamp.proto";

package msg;

message Message {
    string Name = 1;
    google.protobuf.Timestamp TimeStamp = 2;
}

demo_test.go

package msg

import (
    "testing"
    "time"

    // gogo "github.com/gogo/protobuf/proto"
    "github.com/golang/protobuf/proto"
    "github.com/golang/protobuf/ptypes/timestamp"
)

var msg = Message{
    Name:      "demo",
    TimeStamp: &timestamp.Timestamp{Seconds: int64(time.Now().Second())},
}

//func TestGogoMessage_Marshal(t *testing.T) {
//  myBytes, err := gogo.Marshal(&msg)
//  if err != nil {
//      t.Fail()
//  }

//  _ = myBytes
//}

func TestProtoMessage_Marshal(t *testing.T) {
    myBytes, err := proto.Marshal(&msg)
    if err != nil {
        t.Fail()
    }

    _ = myBytes
}

编译时使用：

protoc --gofast_out=. ./demo/msg.proto可以工作，但运行测试：

# github.com/.../demo
package github.com/.../demo (test)
    imports github.com/gogo/protobuf/proto: cannot find package "." in:
    /Users/.../vendor/github.com/gogo/protobuf/proto

protoc --go_out=. ./demo/msg.proto可以工作，但运行测试：

# github.com/.../demo [github.com/.../demo.test]
./msg.pb.go:127:28: m.TimeStamp.MarshalToSizedBuffer undefined (type *timestamp.Timestamp has no field or method MarshalToSizedBuffer)
./msg.pb.go:169:18: m.TimeStamp.Size undefined (type *timestamp.Timestamp has no field or method Size)
./msg.pb.go:277:25: m.TimeStamp.Unmarshal undefined (type *timestamp.Timestamp has no field or method Unmarshal)

Answer 1

这两个命令对我来说都工作得很好，所以，问题可能出在您的环境中。

关于undefine错误，看起来您使用的是来自github.com/golang/protobuf/ptypes/timestamp的Timestamp结构，它具有与https://github.com/gogo/protobuf/blob/master/types/timestamp.pb.go的Timestamp不同的接口。所以如果你用protoc --gofast_out=. ./demo/msg.proto生成msg.pb.go，你会得到这个错误。