Use Knative API with Cloud Run client library (KUBECONFIG authentication)

main.go

package main

import (
	"context"
	"fmt"
	"net/http"

	"google.golang.org/api/option"
	"google.golang.org/api/run/v1"
	_ "k8s.io/client-go/plugin/pkg/client/auth"
	"k8s.io/client-go/rest"
	"k8s.io/client-go/tools/clientcmd"
)

func main() {
	kc := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
		clientcmd.NewDefaultClientConfigLoadingRules(),
		&clientcmd.ConfigOverrides{})
	kubeconfig, err := kc.ClientConfig()
	if err != nil {
		panic(err)
	}
	tr, err := rest.TransportFor(kubeconfig)
	if err != nil {
		panic(err)
	}
	hc := &http.Client{Transport: tr}
	ctx := context.Background()
	runService, err := run.NewService(ctx,
		option.WithHTTPClient(hc),
		option.WithEndpoint(kubeconfig.Host))
	if err != nil {
		panic(err)
	}

	// List Services
	resp, err := runService.Namespaces.Services.List("namespaces/default").Do()
	if err != nil {
		panic(err)
	}
	fmt.Printf("%d kservices found\n", len(resp.Items))
}