Golang Parse Examples

Example #1

File: rpc_lb.go Project: wfxiang08/zero_rpc_proxy

//
// Load Balance如何运维呢?
// 1. 在服务提供方，会会启动Load Balance, 它只负责本机器的某个指定服务的lb
// 2. 正常情况下，不能被轻易杀死
// 3. 需要考虑 graceful stop, 在死之前告知所有的proxy，如何告知呢? TODO
//
//
func main() {
	args, err := docopt.Parse(usage, nil, true, "Chunyu RPC Load Balance v0.1", true)
	if err != nil {
		log.Println(err)
		os.Exit(1)
	}
	var maxFileFrag = 2
	var maxFragSize int64 = bytesize.GB * 1
	if s, ok := args["--log-filesize"].(string); ok && s != "" {
		v, err := bytesize.Parse(s)
		if err != nil {
			log.PanicErrorf(err, "invalid max log file size = %s", s)
		}
		maxFragSize = v
	}

	// set output log file
	if s, ok := args["-L"].(string); ok && s != "" {
		f, err := log.NewRollingFile(s, maxFileFrag, maxFragSize)
		if err != nil {
			log.PanicErrorf(err, "open rolling log file failed: %s", s)
		} else {
			defer f.Close()
			log.StdLog = log.New(f, "")
		}
	}
	log.SetLevel(log.LEVEL_INFO)
	log.SetFlags(log.Flags() | log.Lshortfile)

	// set log level
	if s, ok := args["--log-level"].(string); ok && s != "" {
		setLogLevel(s)
	}
	var backendAddr, frontendAddr, zkAddr, productName, serviceName string

	// set config file
	if args["-c"] != nil {
		configFile := args["-c"].(string)
		conf, err := utils.LoadConf(configFile)
		if err != nil {
			log.PanicErrorf(err, "load config failed")
		}
		productName = conf.ProductName

		if conf.FrontHost == "" {
			fmt.Println("FrontHost: ", conf.FrontHost, ", Prefix: ", conf.IpPrefix)
			if conf.IpPrefix != "" {
				conf.FrontHost = utils.GetIpWithPrefix(conf.IpPrefix)
			}
		}
		if conf.FrontPort != "" && conf.FrontHost != "" {
			frontendAddr = fmt.Sprintf("tcp://%s:%s", conf.FrontHost, conf.FrontPort)
		}

		backendAddr = conf.BackAddr
		serviceName = conf.Service

		zkAddr = conf.ZkAddr
		config.VERBOSE = conf.Verbose

	} else {
		productName = ""
		zkAddr = ""
	}

	if s, ok := args["--product"].(string); ok && s != "" {
		productName = s
	} else if productName == "" {
		// 既没有config指定，也没有命令行指定，则报错
		log.PanicErrorf(err, "Invalid ProductName: %s", s)
	}

	if s, ok := args["--zk"].(string); ok && s != "" {
		zkAddr = s
	} else if zkAddr == "" {
		log.PanicErrorf(err, "Invalid zookeeper address: %s", s)
	}

	if s, ok := args["--service"].(string); ok && s != "" {
		serviceName = s
	} else if serviceName == "" {
		log.PanicErrorf(err, "Invalid ServiceName: %s", s)
	}

	if s, ok := args["--baddr"].(string); ok && s != "" {
		backendAddr = s
	} else if backendAddr == "" {
		log.PanicErrorf(err, "Invalid backend address: %s", s)
	}
	if s, ok := args["--faddr"].(string); ok && s != "" {
		frontendAddr = s
	} else if frontendAddr == "" {
		//
		log.PanicErrorf(err, "Invalid frontend address: %s", s)
	}

	// 正式的服务
	mainBody(zkAddr, productName, serviceName, frontendAddr, backendAddr)
}

Example #2

File: rpc_proxy.go Project: wfxiang08/zero_rpc_proxy

//
// Proxy关闭，则整个机器就OVER, 需要考虑将整个机器下线
// 因此Proxy需要设计的非常完美，不要轻易地被杀死，或自杀
//
func main() {
	// 解析输入参数
	args, err := docopt.Parse(usage, nil, true, "Chunyu RPC Local Proxy v0.1", true)
	if err != nil {
		log.Println(err)
		os.Exit(1)
	}

	var maxFileFrag = 2
	var maxFragSize int64 = bytesize.GB * 1
	if s, ok := args["--log-filesize"].(string); ok && s != "" {
		v, err := bytesize.Parse(s)
		if err != nil {
			log.PanicErrorf(err, "invalid max log file size = %s", s)
		}
		maxFragSize = v
	}

	// set output log file
	if s, ok := args["-L"].(string); ok && s != "" {
		f, err := log.NewRollingFile(s, maxFileFrag, maxFragSize)
		if err != nil {
			log.PanicErrorf(err, "open rolling log file failed: %s", s)
		} else {
			defer f.Close()
			log.StdLog = log.New(f, "")
		}
	}
	log.SetLevel(log.LEVEL_INFO)
	log.SetFlags(log.Flags() | log.Lshortfile)

	// set log level
	if s, ok := args["--log-level"].(string); ok && s != "" {
		setLogLevel(s)
	}

	var zkAddr, frontAddr, productName string

	// 从config文件中读取数据
	if args["-c"] != nil {
		configFile := args["-c"].(string)
		conf, err := utils.LoadConf(configFile)
		if err != nil {
			log.PanicErrorf(err, "load config failed")
		}
		productName = conf.ProductName
		frontAddr = conf.ProxyAddr
		zkAddr = conf.ZkAddr
		config.VERBOSE = conf.Verbose
		config.PROFILE = conf.Profile
	} else {
		productName = ""
		zkAddr = ""
	}

	if s, ok := args["--product"].(string); ok && s != "" {
		productName = s
	} else if productName == "" {
		log.PanicErrorf(err, "Invalid ProductName: %s", s)
	}

	if s, ok := args["--zk"].(string); ok && s != "" {
		zkAddr = s
	} else if zkAddr == "" {
		log.PanicErrorf(err, "Invalid zookeeper address: %s", s)
	}

	if s, ok := args["--faddr"].(string); ok && s != "" {
		frontAddr = s
	} else if frontAddr == "" {
		log.PanicErrorf(err, "Invalid Proxy address: %s", s)
	}

	// 正式的服务
	mainBody(productName, frontAddr, zkAddr)
}