如何为Golang和AppEngine设置VScode调试会话？

Question

VScodeDebugGoAppEngine

Hello World教程,演示如何使用Visual Studio(又名VScode)设置VS Code来调试Golang App Engine代码

这是使用AppEngine文档中的Helloworld代码:

go get -u -d github.com/directmeasure/VScodeDebugGoAppEngine.git

在运行osX 10.13.3的Mac上运行.

我测试了代码,服务器在本地工作.我正在试图弄清楚如何使用调试器输入代码,以便我可以学习如何在其他项目中使用调试器.

这些是我能找到的使用VScode与GAE最好的说明,但他们似乎是过时的基础上更新Golang(如开关Gcloud,-go_debugging标志和目录结构的变化):
https://medium.com/@dbenque /调试-golang-应用服务引擎模块与-视觉工作室码85b3aa59e0f

以下是我采取的步骤:

设置环境

• 添加到.bash_profile

  export BASEFOLDER="/Users/Bryan/google-cloud-sdk/" . 
  export GOROOT="/usr/local/go" # this shoudln't have to be set with current Version, doing it to follow the tutorial . 
  

我是如何尝试运行调试器的:

启动本地服务器.

dev_appserver.py --go_debugging=true app.yaml

将本地二进制文件附加到Delve

 ps aux | grep _go_app 

dlv attach <#using the PID from the server binary>

Delve成功附加到二进制文件.

当我启动调试会话时,蓝色进度条永远不会停止水平扫描.

VARIABLE侧栏永远不会填充hello.go中的变量

断点设置为hello.go:第21行

Debug REPL终端显示:

Verbose logs are written to:  
/var/folders/mw/0y88j8_54bjc93d_lg3120qw0000gp/T/vscode-go-debug.txt  
16:02:31, 2018-4-5  
InitializeRequest  
InitializeResponse  
Using GOPATH: /Users/Bryan/go  
fmt.Print(u)  
Please start a debug session to evaluate  

这是launch.json配置:

{
    "version": "0.2.0",  
    "configurations": [   
    {
        "name": "Launch",
        "type": "go",
        "request": "launch",
        "mode": "debug",
        "remotePath": "",
        //"port": 1234,  
        "port": 2345   // docs say port should match assigned port headless server, https://github.com/Microsoft/vscode-go/wiki/Debugging-Go-code-using-VS-Code#remote-debugging
                         // this creates bind error
        "host": "127.0.0.1",
        "program": "${workspaceFolder}/hello.go",
        "env": {},
        "args": [],
        "showLog": true,
        "trace": true,
    }
    ]
}

以下是我安装的版本:

go version go1.10 darwin/amd64  
$ gcloud version . 
Google Cloud SDK 197.0.0
app-engine-go 
app-engine-python 1.9.68
bq 2.0.31
core 2018.04.06
gsutil 4.30

VS code extension:
Go 0.6.78

编辑###########################

$ lsof -n -i :8080
Bryan@Bryans-MacBook-Pro Thu Apr 12 17:02:04 ~ 
$ lsof -n -i :2345

Bryan@Bryans-MacBook-Pro Thu Apr 12 17:03:34 ~ 
$ ps aux | grep _go_app
Bryan             7433   0.0  0.0  2434840    800 s000  S+    5:03PM   0:00.00 grep _go_app
Bryan             7426   0.0  0.0 556603172   3896 s002  S+    5:02PM   0:00.01 /var/folders/mw/0y88j8_54bjc93d_lg3120qw0000gp/T/tmp8GWk1gappengine-go-bin/_go_app

Bryan@Bryans-MacBook-Pro Thu Apr 12 17:03:52 ~ 
$ dlv attach --headless -l "localhost:2345" 7426 /var/folders/mw/0y88j8_54bjc93d_lg3120qw0000gp/T/tmp8GWk1gappengine-go-bin/_go_app
API server listening at: 127.0.0.1:2345

当我启动调试器时,REPL显示:

Verbose logs are written to:
/var/folders/mw/0y88j8_54bjc93d_lg3120qw0000gp/T/vscode-go-debug.txt
couldn't start listener: listen tcp 127.0.0.1:2345: bind: address already in use
Process exiting with code: 1

Answer 1

VS Code永远不会附加到Delve,因为它正在等待连接到远程Delve服务器127.0.0.1:2345.如果你dlv attach处于无头模式,听正确的地址,你应该能够连接.

以下步骤描述了如何调试运行的Go App Engine应用程序,dev_appserver.py而不是其他工具/帮助程序.但是,当您对Go代码进行更改,dev_appserver.py重新编译并重新启动应用程序时,更改PID Delve需要进行调试.http://github.com/dbenque/delveAppengine可以帮助Delve保持正确的流程.请参阅此处获取教程.

1. 安装VS Code Go扩展.
2. go get -u -d github.com/directmeasure/VScodeDebugGoAppEngine.git

3. cd $GOPATH/src/src/github.com/GoogleCloudPlatform/golang-samples/appengine/helloworld

   注意:如果您的GOPATH有多个条目,cd则go get下载到目录.

4. 启动App Engine开发服务器:

   dev_appserver.py --go_debugging=true app.yaml

5. 访问http:// localhost:8080以确保服务器正在运行.

6. 找到Go过程的PID:

   ps aux | grep _go_app

7. 启动Delve服务器(选择系统上可用的任何端口):

   dlv --headless -l "localhost:2345" attach $GO_APP_PID

8. 打开VS Code调试选项卡(在macOS上⇧⌘D,在Windows和Linux上按Ctrl + Shift + D).
9. 通过单击齿轮并选择任何条目来创建新的启动配置(请参阅此处的官方文档).

10. 创建"Go:连接到服务器"条目:

    注意:这只是一个模板 - 您可以稍后进行编辑.

11. 自定义配置以指向启动Delve时指定的端口.这是我的完整配置:

    {
        "name": "Launch",
        "type": "go",
        "request": "launch",
        "mode": "debug",
        "remotePath": "",
        "port": 2345,
        "host": "127.0.0.1",
        "program": "${fileDirname}",
        "env": {},
        "args": [],
        "showLog": true
    }
    

12. 根据需要添加断点并再次访问http:// localhost:8080.当达到断点时,执行应该停止,变量应该在VS Code的变量部分中列出,并且调用堆栈应该在调用堆栈部分中.

有关在VS Code中调试Go代码(不使用App Engine运行)的一般帮助,请参阅https://github.com/Microsoft/vscode-go/wiki/Debugging-Go-code-using-VS-Code.