VS Code安装go插件失败原因分析以及解决方案

问题背景

VSCode是我们开发go程序的常用工具，但是安装VSCode成功后，创建一个.go文件会有如下提示：

这个是vscode提示你需要安装go插件，但是当你点击install all进行安装时，发现会安装失败。

Installing 8 tools at D:\pragrams\go\bin
  gocode
  gopkgs
  go-outline
  go-symbols
  dlv
  godef
  goreturns
  golint
 
Installing github.com/mdempsky/gocode FAILED
Installing github.com/uudashr/gopkgs/cmd/gopkgs FAILED
Installing github.com/ramya-rao-a/go-outline FAILED
Installing github.com/acroca/go-symbols FAILED
Installing github.com/derekparker/delve/cmd/dlv FAILED
Installing github.com/rogpeppe/godef FAILED
Installing github.com/sqs/goreturns FAILED
Installing golang.org/x/lint/golint FAILED
 
8 tools failed to install.
 
gocode:
Error: Command failed: D:\install\go\bin\go.exe get -u -v github.com/mdempsky/gocode
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/mdempsky/gocode: exec: "git": executable file not found in %PATH%
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/mdempsky/gocode: exec: "git": executable file not found in %PATH%
 
gopkgs:
Error: Command failed: D:\install\go\bin\go.exe get -u -v github.com/uudashr/gopkgs/cmd/gopkgs
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/uudashr/gopkgs/cmd/gopkgs: exec: "git": executable file not found in %PATH%
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/uudashr/gopkgs/cmd/gopkgs: exec: "git": executable file not found in %PATH%
 
go-outline:
Error: Command failed: D:\install\go\bin\go.exe get -u -v github.com/ramya-rao-a/go-outline
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/ramya-rao-a/go-outline: exec: "git": executable file not found in %PATH%
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/ramya-rao-a/go-outline: exec: "git": executable file not found in %PATH%
 
go-symbols:
Error: Command failed: D:\install\go\bin\go.exe get -u -v github.com/acroca/go-symbols
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/acroca/go-symbols: exec: "git": executable file not found in %PATH%
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/acroca/go-symbols: exec: "git": executable file not found in %PATH%
 
dlv:
Error: Command failed: D:\install\go\bin\go.exe get -u -v github.com/derekparker/delve/cmd/dlv
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/derekparker/delve/cmd/dlv: exec: "git": executable file not found in %PATH%
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/derekparker/delve/cmd/dlv: exec: "git": executable file not found in %PATH%
 
godef:
Error: Command failed: D:\install\go\bin\go.exe get -u -v github.com/rogpeppe/godef
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/rogpeppe/godef: exec: "git": executable file not found in %PATH%
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/rogpeppe/godef: exec: "git": executable file not found in %PATH%
 
goreturns:
Error: Command failed: D:\install\go\bin\go.exe get -u -v github.com/sqs/goreturns
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/sqs/goreturns: exec: "git": executable file not found in %PATH%
go: missing Git command. See https://golang.org/s/gogetcmd
package github.com/sqs/goreturns: exec: "git": executable file not found in %PATH%
 
golint:
Error: Command failed: D:\install\go\bin\go.exe get -u -v golang.org/x/lint/golint
go: missing Git command. See https://golang.org/s/gogetcmd
package golang.org/x/lint/golint: exec: "git": executable file not found in %PATH%
go: missing Git command. See https://golang.org/s/gogetcmd
package golang.org/x/lint/golint: exec: "git": executable file not found in %PATH%

问题原因

 在安装go插件时，会自动更新很多依赖库文件，都是从Github更新下来，但是因为Github的文件中，多有应用go官网中的文件，因为一些网络国内无法访问，网络缘故，不能直接下载，导致安装失败。

解决方案

方案1：快速方案

核心是配置国内下载源，我们需要修改如下两个go的环境配置：

go env -w GO111MODULE=on
go env -w GOPROXY=https://goproxy.cn

配置好两个变量后，重新打开VSCode，点击右下方的install all重新安装，

或者，在vscode中使用Ctrl+Shift+P，输入>go:install，下面会自动搜索相关命令，我们选择Go:Install/Update Tools这个命令，选中所有插件，点击确定进行安装。

问题成功解决：

方案2：环境变量中配置

Windows在电脑 -> 系统 -> 高级系统设置 -> 用户环境中分别新建GO111MODULE和GOPROXY两个用户变量，其值如下图所示：

GO111MODULE=on
GOPROXY=https://goproxy.cn,direct

或者也可以使用阿里源代理如下：

GO111MODULE=on
GOPROXY=https://mirrors.aliyun.com/goproxy/   
 

配置好之后，使用Windows + R调出终端，输入cmd，通过go env命令查看go的环境变量配置是否设置成功。 

方案3：vscode中配置

vscode编辑器的设置在：文件 -> 首选项 -> 设置 -> 用户 -> 应用程序 -> 代理服务器路径下，如下图所示：

总结

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