Is it possible to debug go revel framework from Visual Studio Code?

Question

I'm trying to debug a revel app with visual studio but I can't get it to work.

I've seen this question how to debug revel framework(golang) application in visual studio code(vscode) but no answers yet...

I've tried with this config:

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Launch",
      "type": "go",
      "request": "launch",
      "mode": "debug",
      "remotePath": "",
      "port": 2345,
      "host": "127.0.0.1",
      "program": "~/code/go/bin/revel",
      "env": {},
      "args": [],
      "showLog": true
    }
  ]
}

But I'm getting this error: Failed to continue: "The program attribute must point to valid directory, .go file or executable."

I think it must be the rebel binary the one to be run here, but I don't know how to pass the app path, should it go in "args"?

Answer 1

Yes it's possible.

1. Suppose that the GOPATH is C:\Work\golang
2. Revel project name is myapp, thus the location of the project (workspace) will be C:\Work\golang\src\myapp.
3. Make some changes to the controllers etc...
4. Run the application with revel run myapp, then press CTRL+C to exit. This step is necessary to generate corresponding go files. The generated file, i.e. the main package will be available under ${workspaceRoot}/app/tmp/main.go

5. Configure launch.json as follows:

   {
       "version": "0.2.0",
       "configurations": [
           {
               "name": "Launch",
               "type": "go",
               "request": "launch",
               "mode": "debug",
               "remotePath": "",
               "port": 2345,
               "host": "127.0.0.1",
               "env": {},
               "showLog": true,
               "program": "${workspaceRoot}/app/tmp/",
               "args": ["-importPath", "myapp", "-srcPath", "c:\\work\\golang\\src",  "-runMode", "dev"]
           }
       ]
   }
   

6. The important parts are program and args parameters, while the other parameters are unmodified.

7. Set breakpoint and start the delve debugger...

EDIT:

1. Setting args parameter to ["-importPath", "myapp", "-srcPath", "${workspaceRoot}/..", "-runMode", "dev"] also work, and I think this should work in other platforms (Mac, Linux) too.
2. The error message is related to delve issue. See https://github.com/Microsoft/vscode-go/issues/986