VS Code无法安装Go扩展依赖包问题解决及剖析

    在家里按照之前自己写的一篇博客”Go语言开发环境搭建详细教程“进行go语言的开发环境搭建时，发现安装go语言拓展的依赖包时出现错误了，具体错误如下（由于详细错误信息过长，所以下面只截取了部分关键错误信息）：

Installing 8 tools at D:\GoProjects\bin

gocode

go-outline

go-symbols

guru

gorename

gocode-gomod

goreturns

golint

Installing github.com/mdempsky/gocode FAILED

Installing github.com/ramya-rao-a/go-outline FAILED

Installing github.com/acroca/go-symbols FAILED

Installing golang.org/x/tools/cmd/guru FAILED

Installing golang.org/x/tools/cmd/gorename FAILED

Installing github.com/stamblerre/gocode FAILED

Installing github.com/sqs/goreturns FAILED

Installing golang.org/x/lint/golint FAILED

8 tools failed to install.

gocode:

Error: Command failed: C:\Go\bin\go.exe get -u -v github.com/mdempsky/gocode

github.com/mdempsky/gocode (download)

Fetching https://golang.org/x/tools/go/gcexportdata?go-get=1

https fetch failed: Get https://golang.org/x/tools/go/gcexportdata?go-get=1: dial tcp 216.239.37.1:443: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

gocode-gomod:

Error: Command failed: C:\Go\bin\go.exe get -u -v -d github.com/stamblerre/gocode

github.com/stamblerre/gocode (download)

Fetching https://golang.org/x/tools/go/packages?go-get=1

https fetch failed: Get https://golang.org/x/tools/go/packages?go-get=1: dial tcp 216.239.37.1:443: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

golint:

Error: Command failed: C:\Go\bin\go.exe get -u -v golang.org/x/lint/golint

Fetching https://golang.org/x/lint/golint?go-get=1

https fetch failed: Get https://golang.org/x/lint/golint?go-get=1: dial tcp 216.239.37.1:443: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond.

    根据以上错误信息可以得知，安装gocode和gocode-gomod需要依赖于https://golang.org/x/tools，安装golint需要依赖于https://golang.org/x/lint。但是由于我家里的网络无法访问Go官网（https://golang.org），所以最终导致了依赖包的安装失败。

步骤一：查找镜像仓库源

    通过网上查阅资料得知，golang 在 github 上建立了一个镜像库，如：https://golang.org/x/net 的镜像库，在GitHub上对应的是https://github.com/golang/net。果然，我在https://github.com/golang镜像仓库上找到了安装所需的依赖包https://github.com/golang/tools和https://github.com/golang/lint

步骤二：获取镜像仓库

    通过查看公司正常安装了依赖包的GOPATH目录得知，从golang获取的源码存储于D:\GoProjects\src\golang.org\x\目录下面，因此相应的https://golang.org/x/tools和https://golang.org/x/lint的源码也应该存储在对应GOPATH目录下。接下来打开终端command +Ｒ，输入cmd回车，通过以下命令进行源码的获取：

注意：以下均根据我本地设置的GOPATH进行操作，读者实际操作时需要根据VS Code设置的GOPATH进行相应的修改。

步骤三：重新安装

    重新触发安装go语言扩展提示，并点击install all重新安装，关于如何重新触发安装提示可以参照“Go语言开发环境搭建详细教程”。安装成功后，将得到以下提示：

Installing github.com/mdempsky/gocode SUCCEEDED

Installing github.com/ramya-rao-a/go-outline SUCCEEDED

Installing github.com/acroca/go-symbols SUCCEEDED

Installing golang.org/x/tools/cmd/guru SUCCEEDED

Installing golang.org/x/tools/cmd/gorename SUCCEEDED

Installing github.com/stamblerre/gocode SUCCEEDED

Installing github.com/sqs/goreturns SUCCEEDED

Installing golang.org/x/lint/golint SUCCEEDED

All tools successfully installed. You're ready to Go :).

    至此，我们已经成功解决了VS Code 无法安装Go语言扩展依赖包的问题。通过对问题的分析，实际上我们解决的最终问题是“go get 无法下载golang官网语言包”的问题，所以日后如果遇到无法下载golang官网语言包的问题，也可以通过“使用golang的镜像仓库“的方式进行解决。