How to Debug Google App Engine for Golang with VS Code
Summary
Basic
see Golang
Spec
see Golang
Instruction
- install google-app-platform sdk : https://cloud.google.com/sdk/install * we installed to
~/google-cloud-sdk - set PATH to
google-cloud-sdk/bin - create go symbolic link in sdk (
goappcommand in goroot can be used asgocommand)
$ln -s go ~/google-cloud-sdk/platform/google_appengine/goroot-1.9/goapp
- install vscode-go extension
- set workspace settings
{
"go.goroot": "~/google-cloud-sdk/platform/google_appengine/goroot-1.9",
"go.gopath": "~/google-cloud-sdk/platform/google_appengine/gopath",
"go.toolsGopath": "~/google-cloud-sdk/platform/google_appengine/gopath"
}
- execute F1->
Go: Install/Update Tools
when failing install some packages (ex: delve, godoc)
- check goapp version
$~/google-cloud-sdk/platform/google_appengine/goroot-1.9/bin/goapp version
go version 1.9.4 (appengine-1.9.71) darwin/amd64
- download same version runtime from https://golang.org/dl/
- set GOROOT and GOPATH, and install extensions
$export GOPATH=~/google-cloud-sdk/platform/google_appengine/gopath
$export GOROOT=go1.9.4
$go1.9.4/bin/go get github.com/derekparker/delve/cmd/dlv
$go1.9.4/bin/go get golang.org/x/tools/cmd/godoc
prefer setting
set direnv settings(.envrc) in the workspace
export GOROOT=~/google-cloud-sdk/platform/google_appengine/goroot-1.9/
export GOPATH=~/google-cloud-sdk/platform/google_appengine/gopath/
export PATH=~/google-cloud-sdk/platform/google_appengine/gopath/bin:$PATH
export PATH=~/google-cloud-sdk/platform/google_appengine/goroot-1.9/bin:$PATH
debugging devserver
settings.json
same for remote debugging
{
"version": "0.2.0",
"configurations": [
{
"name": "Connect to server",
"type": "go",
"request": "launch",
"mode": "remote",
"remotePath": "${workspaceRoot}",
"port": 2345,
"host": "127.0.0.1",
"program": "${workspaceRoot}",
"env": {},
"args": []
},
]
}
how to
- run
dev_appserver.pywith--go_debugging
$dev_appserver.py app.yaml --go_debugging
- check pid and dlv attaches it with headless and listen settings
$ps au | grep _go_ap[p]
nnyn 16353 0.0 0.0 558439268 4384 s002 S+ 5:54PM 0:00.01 /var/folders/tb/nzm_jqzn1f5d1r2jlj8jp3nw0000gn/T/tmputIGVHappengine-go-bin/_go_app
$dlv attach 16353 --headless --listen=:2345 --log
API server listening at: [::]:2345
- start debug at VS Code