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: bfe.go
    path of file: ./repos/bfe
    
    the code of the file until where you have to start completion: // Copyright (c) 2019 The BFE Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package main

import (
	"flag"
	"fmt"
	"path"
	"runtime"
	"time"
)

import (
	"github.com/baidu/go-lib/log"
	"github.com/baidu/go-lib/log/log4go"
	_ "go.uber.org/automaxprocs"
)

import (
	"github.com/bfenetworks/bfe/bfe_config/bfe_conf"
	"github.com/bfenetworks/bfe/bfe_debug"
	"github.com/bfenetworks/bfe/bfe_server"
	"github.com/bfenetworks/bfe/bfe_util"
)

var (
	help        = flag.Bool("h", false, "to show help")
	confRoot    = flag.String("c", "./conf", "root path of configuration")
	logPath     = flag.String("l", "./log", "dir path of log")
	stdOut      = flag.Bool("s", false, "to show log in stdout")
	showVersion = flag.Bool("v", false, "to show version of bfe")
	showVerbose = flag.Bool("V", false, "to show verbose information about bfe")
	debugLog    = flag.Bool("d", false, "to show debug log (otherwise >= info)")
	testConf    = flag.Bool("t", false, "test configuration and exit")
)

var version string
var commit string

func main() {
	var err error
	var config bfe_conf.BfeConfig
	var logSwitch string

	flag.Parse()
	if *help {
		flag.PrintDefaults()
		return
	}
	if *showVersion {
		fmt.Printf("bfe version: %s\n", version)
		return
	}
	if *showVerbose {
		fmt.Printf("bfe version: %s\n", version)
		fmt.Printf("go version: %s\n", runtime
    
func main() {
	var err error
	var config bfe_conf.BfeConfig
	var logSwitch string

	flag.Parse()
	if *help {
		flag.PrintDefaults()
		return
	}
	if *showVersion {
		fmt.Printf("bfe version: %s\n", version)
		return
	}
	if *showVerbose {
		fmt.Printf("bfe version: %s\n", version)
		fmt.Printf("go version: %s\n", runtime.Version())
		fmt.Printf("git commit: %s\n", commit)
		return
	}

	// debug switch
	if *debugLog {
		logSwitch = "DEBUG"
		bfe_debug.DebugIsOpen = true
	} else {
		// ignore under ERROR level
		if *testConf {
			logSwitch = "ERROR"
		} else {
			logSwitch = "INFO"
		}
		bfe_debug.DebugIsOpen = false
	}

	// initialize log
	log4go.SetLogBufferLength(10000)
	log4go.SetLogWithBlocking(false)
	log4go.SetLogFormat(log4go.FORMAT_DEFAULT_WITH_PID)
	log4go.SetSrcLineForBinLog(false)

	err = log.Init("bfe", logSwitch, *logPath, *stdOut || *testConf, "midnight", 7)
	if err != nil {
		fmt.Printf("bfe: err in log.Init():%s\n", err.Error())
		bfe_util.AbnormalExit()
	}

	log.Logger.Info("bfe[version:%s] start", version)

	// load server config
	confPath := path.Join(*confRoot, "bfe.conf")
	config, err = bfe_conf.BfeConfigLoad(confPath, *confRoot)
	if err != nil {
		log.Logger.Error("main(): in BfeConfigLoad():%s", err.Error())
		if *testConf {
			fmt.Printf("bfe: configuration file %s test failed\n", confPath)
		}
		bfe_util.AbnormalExit()
	}

	// maximum number of CPUs (GOMAXPROCS) defaults to runtime.CPUNUM
	// if running on machine, or CPU quota if running on container
	// (with the help of "go.uber.org/automaxprocs").
	// here, we change maximum number of cpus if the MaxCpus is positive.
	if config.Server.MaxCpus > 0 {
		runtime.GOMAXPROCS(config.Server.MaxCpus)
	}

	// set log level
	bfe_debug.SetDebugFlag(config.Server)

	// start and serve
	if err = bfe_server.StartUp(config, version, *confRoot, *testConf); err != nil {
		log.Logger.Error("main(): bfe_server.StartUp(): %s", err.Error())
	}

	// waiting for logger finish jobs
	time.Sleep(1 * time.Second)
	log.Logger.Close()

	// output final configuration test result
	if *testConf {
		if err != nil {
			fmt.Printf("bfe: configuration file %s test failed\n", confPath)
			bfe_util.AbnormalExit()
		} else {
			fmt.Printf("bfe: configuration file %s test is successful\n", confPath)
			bfe_util.NormalExit()
		}
	}
}