Unable to list folders in GCP using go client library - go

Question

I am going through the documentation of cloudresourcemanager package and trying to build a simple example to list the folders of my GCP project.
The following example however fails
package main
import (
"context"
"fmt"
"log"
cloudresourcemanager "google.golang.org/api/cloudresourcemanager/v2"
)
func main() {
ctx := context.Background()
svc, err := cloudresourcemanager.NewService(ctx)
if err != nil {
log.Fatal(err)
}
foldersService := cloudresourcemanager.NewFoldersService(svc)
fmt.Println(foldersService)
foldersListCall := foldersService.List()
resp, err := foldersListCall.Do()
if err != nil {
fmt.Println("Here")
log.Fatal(err)
}
for _, fld := range resp.Folders {
fmt.Println(fld.Name)
}
}
It fails in
resp, err := foldersListCall.Do()
and the error is
googleapi: Error 400: Request contains an invalid argument., badRequest
I have the following environment variables set
GOOGLE_CLOUD_PROJECT=my-project-id
GOOGLE_APPLICATION_CREDENTIALS=/path/to/application_default_credentials.json
and gcloud cli works fine.
Any suggestions what I might be missing?

Answer 1

The error message is not helpful at all...
The problem is I was not setting the Parent parameter in the request, i.e. the organization (switching to v3 helped a bit)
package main
import (
"context"
"fmt"
"log"
cloudresourcemanager "google.golang.org/api/cloudresourcemanager/v3"
)
func main() {
ctx := context.Background()
svc, err := cloudresourcemanager.NewService(ctx)
if err != nil {
log.Fatal(err)
}
foldersService := cloudresourcemanager.NewFoldersService(svc)
foldersListCall := foldersService.List()
foldersListCall.Parent("organizations/12345678910")
resp, err := foldersListCall.Do()
if err != nil {
log.Fatal(err)
}
for _, fld := range resp.Folders {
fmt.Println(fld.DisplayName)
}
}