Remote debugging - Unverified breakpoint

Question

Hope I can explain this right.

Update: I can confirm that dlv debug -l 127.0.0.1:2345 does work. Therefore I must be in VsCode launch.json

Answer 1

I figured out my problem by adding the "trace" option to the launch.json (in VS Code)

    {
        "name": "Attach remote ",
        "type": "go",
        "request": "attach",
        "mode": "remote",
        "remotePath": "/home/me/goprojects/src/github.com/owner/project/package",
        "port": 2345,
        "host": "xxxx.xyz",
        "trace":"log",

    }

Doing that revealed in the Debug Console that it was looking for the source file with the wrong path. I realised that remotePath in the launch.json should be (for my setup at least) just /home/me/goprojects/src/github.com/owner/project

So, try adding trace and scrutinize the Debug Console

Answer 2

I managed to get delve and vscode with go working for me by using docker-compose.

I use my Dockerfile to build the app as you do and just override some container attributes in my docker-compose.yml.

Here's how my docker-compose.yml looks :

version: '2'
services:
  my_app:
    build: .
    security_opt:
      - seccomp:unconfined
    entrypoint: dlv debug github.com/my_user/my_app -l 0.0.0.0:2345 --headless=true --log=true -- server
    volumes:
      - .:/opt/go/src/github.com/my_user/my_app
    ports:
      - "2345:2345"
    expose:
      - "2345"

And the launch.json file :

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Remote Docker",
            "type": "go",
            "request": "launch",
            "mode": "remote",
            "remotePath": "/opt/go/src/github.com/my_user/my_app",
            "port": 2345,
            "host": "192.168.99.100",
            "program": "${workspaceRoot}",
            "env": {},
            "args": []
        }
    ]
}

Note that since I'm on OS X the IP is what my docker-machine ip default prints. You can change it to 127.0.0.1 if this is what your docker-machine ip outputs.

On docker-compose up, my_app prints :

my_app_1 | 2016/12/14 12:41:32 server.go:71: Using API v1

my_app_1 | 2016/12/14 12:41:32 debugger.go:65: launching process with args: [/opt/go/src/github.com/my_user/my_app/debug server]

my_app_1 | API server listening at: [::]:2345

And after setting up some breakpoints and attaching the debugger it works.

Hope this helps!