How to use Delve debugger in Visual Studio Code - go

Question

I have installed the Go extension for VS Code, but unable to make it work.
"dlv debug" works alright from the terminal.
dlv debug src/github.com/user/hello
The launch.json:
{
"version": "0.2.0",
"configurations": [
{
"name": "Launch",
"type": "go",
"request": "launch",
"mode": "debug",
"program": "${workspaceRoot}",
"env": {},
"args": []
}
]
}
Do you know how to set it up?

Answer 1

For using Delve debugger in Visual Studio Code with Golang, do the following steps:
( Note: for Windows OS replace all $GOPATH with %GOPATH% )
Install Latest Golang and set GOROOT and GOPATH
Add $GOPATH/bin to your OS PATH environment variable.
set environment variable: GO15VENDOREXPERIMENT = 1
run: go get github.com/derekparker/delve/cmd/dlv and make sure dlv binary generated in your $GOPATH/bin
Install Visual Studio Code
Launch VS Code Quick Open (Ctrl+P), paste this command: ext install Go , and press enter.
click install Rich Go language support for Visual Studio Code
click Enable and restart Visual Studio Code
Inside Visual Studio Code Open Folder Ctrl+Shift+E , e.g.: $GOPATH\src\hello\
Then Open hello.go from that folder (or make new file Ctrl+N and save it on this folder):
package main
import "fmt"
func main() {
fmt.Println("Hello World!")
i := 101
fmt.Println(i)
}
Then Open Debugger Ctrl+Shift+D
on this line: i := 101 press F9 to set or toggle beakpoint.
Press F5 to start debugging or to Run the application, if asked to select environment: select Go.
Press F10 to Step Over.
Press F11 to Step Into.
Press Shift+F11 to Step Out.
Press Shift+F5 to Stop Debugging.
Press Ctrl+Shift+F5 to Restart Debugging.
My launch.json untouched:
{
"version": "0.2.0",
"configurations": [
{
"name": "Launch",
"type": "go",
"request": "launch",
"mode": "debug",
"remotePath": "",
"port": 2345,
"host": "127.0.0.1",
"program": "${workspaceRoot}",
"env": {},
"args": [],
"showLog": true
}
]
}
Result:

Answer 2

You have to do three things here:
Install Delve. Looking at your question it seems that you have already installed Delve.
Install Go extension for VS Code. The extension can be found at : https://github.com/golang/vscode-go
Install dlv tool for Go. You can do that by opening up Command Palette (Ctrl+Shift+P / Cmd+Shift+P) and select Go: Install/Update Tools then search/select dlv
Now you can start debugging with delve in VS code.
More more detailed instruction please follow : https://dev.to/nyxtom/debugging-in-go-in-vs-code-1c7f

Answer 3

This launch.json worked for me to run the Golang debugger in VSCode:
{
"version": "0.2.0",
"configurations": [
{
"name": "Launch file",
"type": "go",
"request": "launch",
"mode": "auto",
"program": "${file}",
"env": {
"PATH": "/usr/local/go/bin:${fileDirname}"
},
"args": []
}
]
}
VSCode Variables Reference:
If file /home/your-username/your-project/folder/main.go is open in VSCode and
directory /home/your-username/your-project is your root workspace, then
${file} = /home/your-username/your-project/folder/main.go
${fileDirname} = /home/your-username/your-project/folder
My specific values:
$GOROOT: /usr/local/go
$GOPATH: /Users/myname/code
${file}: /Users/myname/code/src/github.com/githubName/appName/main.go
${fileDirname}: /Users/myname/code/src/github.com/githubName/appName

Answer 4

FTA (in case it is hard to find), if when using delve and you get cannot find package error even though your GOPATH is set correctly, check out this bug of vscode-go, it is affecting both MAC OS and Linux, as of October, 2017.
The solution is posted there as well:
... adding the GOPATH as an env var in the env property in the launch.json file solved the problem

Answer 5

Content launch.json for gdb and delve
{
// Используйте IntelliSense, чтобы узнать о возможных атрибутах.
// Наведите указатель мыши, чтобы просмотреть описания существующих атрибутов.
// Для получения дополнительной информации посетите: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
{
"name": "Delve",
"type": "go",
"request": "launch",
"mode": "debug",
"remotePath": "",
"port": 2345,
"host": "127.0.0.1",
"program": "${workspaceRoot}/src/hello/hello.go",
"env": {},
"args": [],
"showLog": true
}
,
{
"type": "gdb",
"request": "launch",
"name": "GDB",
"target": "${workspaceRoot}/src/hello/hello",
"cwd": "${workspaceRoot}",
"linux": {
"MIMode": "gdb",
"setupCommands": [
{
"description": "Enable pretty-printing for gdb",
"text": "-enable-pretty-printing",
"ignoreFailures": true
}
]
},
}
]
}

Answer 6

If you got error : Failed to continue: "Cannot find Delve debugger. Install from https://github.com/go-delve/delve & ensure it is in your Go tools path, "GOPATH/bin" or "PATH"."
Maybe you can use my solution (on mac) :
First follow how to install delve on here : https://github.com/go-delve/delve/tree/master/Documentation/installation
Open your vscode, go to your project directory, then on vscode terminal : go mod init example.com/m/v1
run : go get github.com/go-delve/delve/cmd/dlv
Open mac terminal and run : open ~/.zshrc (if not exist, run : touch ~/.zshrc)
Make sure that file contains this script :
export GOPATH=$HOME/go
export PATH=$PATH:$GOPATH/bin
export PATH=$PATH:$GOROOT/bin
export GOROOT=/usr/local/go
Then copy all script on .zshrc
Still on mac terminal, run : open ~/.bashrc (if not exist, run : touch ~/.bashrc)
Paste the script to .bashrc file
Then save .zshrc and .bashrc
close terminal & close vscode
Open vscode again
The last thing, make sure you already create launch.json (in .vscode folder), then you can follow my launch.json :
{
"version": "0.2.0",
"configurations": [
{
"name": "Launch",
"type": "go",
"request": "launch",
"mode": "auto",
"program": "${workspaceFolder}",
"args": []
}
]
}
Then finish ! You can try again run your program and follow step2 using delve on accepted answer