Search for Go in VS Code Extensions and install it.
You will need to install Delve to get debugging (breakpoints, step through, etc) in VS Code.
go install github.com/go-delve/delve/cmd/dlv@latest
If you used asdfto install Go, delve will be located in:
~/.asdf/shims/dlv
You might want to run asdf reshim after installing a go package.
Since GoLang is a compiled language, code will be compiled into a single executable. During development, making changes will require us to constantly recompile, which can be a manual process, especially in VS Code.
We will use https://github.com/air-verse/air to do live reloading for us.
It is a command line tool that only needs to be run once within your project folder to watch for changes.
Install the package. Assuming you have go v1.22 or higher.
go install github.com/air-verse/air@latest
If you used asdf to install Go, air will be located in:
~/.asdf/shims/air
Initialise an air.toml config file in your project root
cd ~/myproject air init
Edit air.toml [[go build]] command to:
- all: flags should be applied to all packages in build packages
- -N: disabled optimisations to ensure generated code closer to source code for easier debugging
- -l: disables inlining optimisation where small functions are expanded in place to reduce overhead of function calls, making it easier for debugging
- Reasoning from Delve Reference
- cmd = "go build -o ./tmp/main ." + cmd = 'CGO_ENABLED=0 go build -gcflags=all="-N -l"-o ./tmp/main .'"'
[!info]
air will run with default configurations if:
- air.toml file is invalid
- run it in your project folder by running the command air
It will not use your air.toml file.
Edit air.toml full_bin to run the built binary with [[Delve]].
- full_bin = "" + full_bin = "dlv exec ./tmp/main --listen=127.0.0.1:2345 --headless=true --api-version=2 --accept-multiclient --continue --log --"
This will run Delve on port 2345.
Run air in your project folder. You should see the following output.
> cd ~/my-project > air __ _ ___ / /\ | | | |_) /_/--\ |_| |_| \_ v1.52.3, built with Go go1.22.5 mkdir ~/my-project/tmp watching . !exclude tmp building... running... API server listening at: 127.0.0.1:2345 2024-07-28T18:47:07+07:00 info layer=debugger launching process with args: [./tmp/main] 2024-07-28T18:47:09+07:00 debug layer=debugger entryPoint 0x1006e8000 machoOff 0x100000000 2024-07-28T18:47:09+07:00 warning layer=debugger debug_frame workaround not applied: function internal/abi.(*RegArgs).IntRegArgAddr (at 0x1006e9070) covered by 0x1006e9070-0x1006e9110 2024-07-28T18:47:09+07:00 debug layer=debugger Adding target 11503 "/Users/alaay/projects/scheduleasy/tmp/main" 2024-07-28T18:47:09+07:00 debug layer=debugger continuing 2024-07-28T18:47:09+07:00 debug layer=debugger ContinueOnce 2024/07/28 18:47:09 Starting server on :5602
In your .vscode/launch.config file, add the following:
{ // Use IntelliSense to learn about possible attributes. // Hover to view descriptions of existing attributes. // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387 "version": "0.2.0", "configurations": [ { "name": "Attach to Air", "type": "go", "request": "attach", "mode": "remote", "port": 2345, "host": "127.0.0.1" } ] }
In VS Code Run and Debug (CMD + SHIFT + D), start debugging with Attach to Air
[!info] VS Code unable to connect
If VS Code is unable to connect, it is most likely that Delve is not running on port 2345. Try using lsof -i :2345 to check if dlv is running using that port. If it is running, you should see:$ lsof -i :2345 COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME dlv 15464 username 3u IPv4 0x201bff14586139e3 0t0 TCP localhost:dbm (LISTEN)Copy after login
Go is a compiled language. That means that code is compiled into a binary and then executed. Whenever we make changes to the code in vscode:
This means that the vscode will be disconnected and you will need to reattach vscode to delve.
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