无法使用protobuf包

Question

看来我无法导入这个包：github.com/golang/protobuf/proto

当我尝试build或使用时go get我得到：

cannot load github.com/golang/protobuf/proto: module github.com/golang/protobuf@latest (v1.3.2) found, but does not contain package github.com/golang/protobuf/proto

这是一个流行的软件包，我很惊讶它似乎不起作用。 https://godoc.org/github.com/golang/protobuf/proto#Marshal

有人遇到过这种情况吗？

更新：

我只是想导入这个：

import (
    "bytes"
    "context"
    "encoding/json"
    "errors"
    "fmt"
    "github.com/golang/protobuf/proto"
)

GoLang 不解析上述路径中的 proto...

我尝试像这样安装：

$ go get github.com/golang/protobuf/proto
go: finding github.com/golang/protobuf/proto latest
go get github.com/golang/protobuf/proto: module github.com/golang/protobuf@upgrade (v1.3.2) found, but does not contain package github.com/golang/protobuf/proto

Update2，不确定该文件有何帮助，但它是：

package main

import (
    "bytes"
    "context"
    "encoding/json"
    "errors"
    "fmt"
    "github.com/golang/protobuf/proto"
    "go_poc/plugins/com_styx_proto"
    "io/ioutil"
    "net/http"
    "time"
)

func init() {
    fmt.Println("styxBotDetect plugin is loaded!")
}

func (r registrable) RegisterHandlers(f func(
    name string,
    handler func(
        context.Context,
        map[string]interface{},
        http.Handler) (http.Handler, error),
)) {
    f(pluginName, r.registerHandlers)
}

func (r registrable) registerHandlers(ctx context.Context, extra map[string]interface{}, handler http.Handler) (http.Handler, error) {
// skipping some lines here

styxRqBytes, err := proto.Marshal(styxRq)
        if err != nil {
            http.Error(w, err.Error(), http.StatusNotAcceptable)
            return
        }

// more code

Answer 1

事实证明模块缓存有问题，这就是该go工具无法获取/更新依赖项的原因。

在这种情况下，清除模块缓存（可能）会有所帮助：

go clean -modcache