说明

golang cli示例是从最受好评的开源项目中提取的实现代码，你可以参考下面示例的使用方式。

编程语言: Golang

命名空间/包名称: github.com/outbrain/orchestrator/go/app

示例#1
文件： main.go 项目： shuhaowu/orchestrator 

// main is the application's entry point. It will either spawn a CLI or HTTP itnerfaces.
func main() {
	configFile := flag.String("config", "", "config file name")
	command := flag.String("c", "", "command (discover|forget|continuous|move-up|move-below|begin-maintenance|end-maintenance|clusters|topology)")
	strict := flag.Bool("strict", false, "strict mode (more checks, slower)")
	instance := flag.String("i", "", "instance, host:port")
	sibling := flag.String("s", "", "sibling instance, host:port")
	owner := flag.String("owner", "", "operation owner")
	reason := flag.String("reason", "", "operation reason")
	duration := flag.String("duration", "", "maintenance duration (format: 59s, 59m, 23h, 6d, 4w)")
	pattern := flag.String("pattern", "", "regular expression pattern")
	clusterAlias := flag.String("alias", "", "cluster alias")
	pool := flag.String("pool", "", "Pool logical name (applies for pool-related commands)")
	hostnameFlag := flag.String("hostname", "", "Hostname/fqdn/CNAME/VIP (applies for hostname/resolve related commands)")
	discovery := flag.Bool("discovery", true, "auto discovery mode")
	verbose := flag.Bool("verbose", false, "verbose")
	debug := flag.Bool("debug", false, "debug mode (very verbose)")
	stack := flag.Bool("stack", false, "add stack trace upon error")
	config.RuntimeCLIFlags.SkipUnresolveCheck = flag.Bool("skip-unresolve-check", false, "Skip/ignore checking an unresolve mapping (via hostname_unresolve table) resolves back to same hostname")
	config.RuntimeCLIFlags.Noop = flag.Bool("noop", false, "Dry run; do not perform destructing operations")
	flag.Parse()

	log.SetLevel(log.ERROR)
	if *verbose {
		log.SetLevel(log.INFO)
	}
	if *debug {
		log.SetLevel(log.DEBUG)
	}
	if *stack {
		log.SetPrintStackTrace(*stack)
	}

	log.Info("starting")

	runtime.GOMAXPROCS(math.MinInt(4, runtime.NumCPU()))

	if len(*configFile) > 0 {
		config.ForceRead(*configFile)
	} else {
		config.Read("/etc/orchestrator.conf.json", "conf/orchestrator.conf.json", "orchestrator.conf.json")
	}
	if config.Config.Debug {
		log.SetLevel(log.DEBUG)
	}

	if len(flag.Args()) == 0 && *command == "" {
		// No command, no argument: just prompt
		fmt.Println(prompt)
		return
	}

	switch {
	case len(flag.Args()) == 0 || flag.Arg(0) == "cli":
		app.Cli(*command, *strict, *instance, *sibling, *owner, *reason, *duration, *pattern, *clusterAlias, *pool, *hostnameFlag)
	case flag.Arg(0) == "http":
		app.Http(*discovery)
	default:
		log.Error("Usage: orchestrator --options... [cli|http]")
	}
}

示例#2
文件： main.go 项目： is00hcw/orchestrator 

// main is the application's entry point. It will either spawn a CLI or HTTP itnerfaces.
func main() {
	configFile := flag.String("config", "", "config file name")
	command := flag.String("c", "", "command, required. See full list of commands via 'orchestrator -c help'")
	strict := flag.Bool("strict", false, "strict mode (more checks, slower)")
	instance := flag.String("i", "", "instance, host_fqdn[:port] (e.g. db.company.com:3306, db.company.com)")
	sibling := flag.String("s", "", "sibling instance, host_fqdn[:port]")
	destination := flag.String("d", "", "destination instance, host_fqdn[:port] (synonym to -s)")
	owner := flag.String("owner", "", "operation owner")
	reason := flag.String("reason", "", "operation reason")
	duration := flag.String("duration", "", "maintenance duration (format: 59s, 59m, 23h, 6d, 4w)")
	pattern := flag.String("pattern", "", "regular expression pattern")
	clusterAlias := flag.String("alias", "", "cluster alias")
	pool := flag.String("pool", "", "Pool logical name (applies for pool-related commands)")
	hostnameFlag := flag.String("hostname", "", "Hostname/fqdn/CNAME/VIP (applies for hostname/resolve related commands)")
	discovery := flag.Bool("discovery", true, "auto discovery mode")
	quiet := flag.Bool("quiet", false, "quiet")
	verbose := flag.Bool("verbose", false, "verbose")
	debug := flag.Bool("debug", false, "debug mode (very verbose)")
	stack := flag.Bool("stack", false, "add stack trace upon error")
	config.RuntimeCLIFlags.Databaseless = flag.Bool("databaseless", false, "EXPERIMENTAL! Work without backend database")
	config.RuntimeCLIFlags.SkipUnresolveCheck = flag.Bool("skip-unresolve-check", false, "Skip/ignore checking an unresolve mapping (via hostname_unresolve table) resolves back to same hostname")
	config.RuntimeCLIFlags.Noop = flag.Bool("noop", false, "Dry run; do not perform destructing operations")
	config.RuntimeCLIFlags.BinlogFile = flag.String("binlog", "", "Binary log file name")
	flag.Parse()

	if *destination != "" && *sibling != "" {
		log.Fatalf("-s and -d are synonyms, yet both were specified. You're probably doing the wrong thing.")
	}
	if *destination == "" {
		*destination = *sibling
	}

	log.SetLevel(log.ERROR)
	if *verbose {
		log.SetLevel(log.INFO)
	}
	if *debug {
		log.SetLevel(log.DEBUG)
	}
	if *stack {
		log.SetPrintStackTrace(*stack)
	}

	log.Info("starting")

	runtime.GOMAXPROCS(math.MinInt(4, runtime.NumCPU()))

	if len(*configFile) > 0 {
		config.ForceRead(*configFile)
	} else {
		config.Read("/etc/orchestrator.conf.json", "conf/orchestrator.conf.json", "orchestrator.conf.json")
	}
	if *config.RuntimeCLIFlags.Databaseless {
		config.Config.DatabaselessMode__experimental = true
	}
	if config.Config.Debug {
		log.SetLevel(log.DEBUG)
	}
	if *quiet {
		// Override!!
		log.SetLevel(log.ERROR)
	}
	if config.Config.EnableSyslog {
		log.EnableSyslogWriter("orchestrator")
		log.SetSyslogLevel(log.INFO)
	}
	if config.Config.AuditToSyslog {
		inst.EnableAuditSyslog()
	}

	if len(flag.Args()) == 0 && *command == "" {
		// No command, no argument: just prompt
		fmt.Println(prompt)
		return
	}

	var executionMode OrchestratorExecutionMode
	switch {
	case len(flag.Args()) == 0 || flag.Arg(0) == "cli":
		executionMode = CliMode
	case flag.Arg(0) == "http":
		executionMode = HttpMode
	default:
		fmt.Fprintln(os.Stderr, `Usage: 
  orchestrator --options... [cli|http]
See complete list of commands:
  orchestrator -c help
Full blown documentation:
  orchestrator
`)
		os.Exit(1)
	}

	process.ContinuousRegistration(string(executionMode))
	switch executionMode {
	case CliMode:
		app.Cli(*command, *strict, *instance, *destination, *owner, *reason, *duration, *pattern, *clusterAlias, *pool, *hostnameFlag)
	case HttpMode:
		app.Http(*discovery)
	}
}