You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: go-oauth2-server.go
    path of file: ./repos/go-oauth2-server
    
    the code of the file until where you have to start completion: package main

import (
	"log"
	"os"

	"github.com/RichardKnop/go-oauth2-server/cmd"
	"github.com/urfave/cli"
)

var (
	cliApp        *cli.App
	configBackend string
)

func init() {
	// Initialise a CLI app
	cliApp = cli.NewApp()
	cliApp.Name = "go-oauth2-server"
	cliApp.Usage = "Go OAuth 2.0 Server"
	cliApp.Author = "Richard Knop"
	cliApp.Email = "risoknop@gmail.com"
	cliApp.Version = "0.0.0"
	cliApp.Flags = []cli.Flag{
		cli.StringFlag{
			Name:        "configBackend",
			Value:       "etcd",
			Destination: &configBacke
    
func main() {
	// Set the CLI app commands
	cliApp.Commands = []cli.Command{
		{
			Name:  "migrate",
			Usage: "run migrations",
			Action: func(c *cli.Context) error {
				return cmd.Migrate(configBackend)
			},
		},
		{
			Name:  "loaddata",
			Usage: "load data from fixture",
			Action: func(c *cli.Context) error {
				return cmd.LoadData(c.Args(), configBackend)
			},
		},
		{
			Name:  "runserver",
			Usage: "run web server",
			Action: func(c *cli.Context) error {
				return cmd.RunServer(configBackend)
			},
		},
	}

	// Run the CLI app
	if err := cliApp.Run(os.Args); err != nil {
		log.Fatal(err)
	}
}