Golang FlagSet.String方法代碼示例

func (cmd *editDescriptionCmd) Flags(fs *flag.FlagSet) *flag.FlagSet {
	cmd.ById = fs.Bool(drive.CLIOptionId, false, "open by id instead of path")
	cmd.Description = fs.String(drive.CLIOptionDescription, "", drive.DescDescription)
	cmd.Piped = fs.Bool(drive.CLIOptionPiped, false, drive.DescPiped)

	return fs
}

func commandVtGateSplitQuery(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
	server := subFlags.String("server", "", "VtGate server to connect to")
	bindVariables := newBindvars(subFlags)
	connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vtgate client")
	splitCount := subFlags.Int("split_count", 16, "number of splits to generate")
	keyspace := subFlags.String("keyspace", "", "keyspace to send query to")
	if err := subFlags.Parse(args); err != nil {
		return err
	}
	if subFlags.NArg() != 1 {
		return fmt.Errorf("the <sql> argument is required for the VtGateSplitQuery command")
	}

	vtgateConn, err := vtgateconn.Dial(ctx, *server, *connectTimeout)
	if err != nil {
		return fmt.Errorf("error connecting to vtgate '%v': %v", *server, err)
	}
	defer vtgateConn.Close()
	r, err := vtgateConn.SplitQuery(ctx, *keyspace, tproto.BoundQuery{
		Sql:           subFlags.Arg(0),
		BindVariables: *bindVariables,
	}, *splitCount)
	if err != nil {
		return fmt.Errorf("SplitQuery failed: %v", err)
	}
	wr.Logger().Printf("%v\n", jscfg.ToJSON(r))
	return nil
}

func commandLegacySplitClone(wi *Instance, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) (Worker, error) {
	excludeTables := subFlags.String("exclude_tables", "", "comma separated list of tables to exclude")
	strategy := subFlags.String("strategy", "", "which strategy to use for restore, use 'vtworker LegacySplitClone --strategy=-help k/s' for more info")
	sourceReaderCount := subFlags.Int("source_reader_count", defaultSourceReaderCount, "number of concurrent streaming queries to use on the source")
	destinationPackCount := subFlags.Int("destination_pack_count", defaultDestinationPackCount, "number of packets to pack in one destination insert")
	destinationWriterCount := subFlags.Int("destination_writer_count", defaultDestinationWriterCount, "number of concurrent RPCs to execute on the destination")
	minHealthyRdonlyTablets := subFlags.Int("min_healthy_rdonly_tablets", defaultMinHealthyRdonlyTablets, "minimum number of healthy RDONLY tablets before taking out one")
	maxTPS := subFlags.Int64("max_tps", defaultMaxTPS, "if non-zero, limit copy to maximum number of (write) transactions/second on the destination (unlimited by default)")
	if err := subFlags.Parse(args); err != nil {
		return nil, err
	}
	if subFlags.NArg() != 1 {
		subFlags.Usage()
		return nil, fmt.Errorf("command LegacySplitClone requires <keyspace/shard>")
	}

	keyspace, shard, err := topoproto.ParseKeyspaceShard(subFlags.Arg(0))
	if err != nil {
		return nil, err
	}
	var excludeTableArray []string
	if *excludeTables != "" {
		excludeTableArray = strings.Split(*excludeTables, ",")
	}
	worker, err := NewLegacySplitCloneWorker(wr, wi.cell, keyspace, shard, excludeTableArray, *strategy, *sourceReaderCount, *destinationPackCount, *destinationWriterCount, *minHealthyRdonlyTablets, *maxTPS)
	if err != nil {
		return nil, fmt.Errorf("cannot create split clone worker: %v", err)
	}
	return worker, nil
}

// newCommandSub creates and returns a sub command.
func newCommandSub(args []string, cli *client.Client) (command, error) {
	// Create a flag set.
	var flg flag.FlagSet

	// Define the flags.
	topicFilter := flg.String("t", "", "Topic Filter")
	qos := flg.Uint("q", uint(mqtt.QoS0), "QoS")

	// Parse the flag.
	if err := flg.Parse(args); err != nil {
		return nil, errCmdArgsParse
	}

	// Create a sub command.
	cmd := &commandSub{
		cli: cli,
		subscribeOpts: &client.SubscribeOptions{
			SubReqs: []*client.SubReq{
				&client.SubReq{
					TopicFilter: []byte(*topicFilter),
					QoS:         byte(*qos),
					Handler:     messageHandler,
				},
			},
		},
	}

	// Return the command.
	return cmd, nil
}

func commandVerticalSplitClone(wi *Instance, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) (Worker, error) {
	tables := subFlags.String("tables", "", "comma separated list of tables to replicate (used for vertical split)")
	strategy := subFlags.String("strategy", "", "which strategy to use for restore, use 'mysqlctl multirestore -strategy=-help' for more info")
	sourceReaderCount := subFlags.Int("source_reader_count", defaultSourceReaderCount, "number of concurrent streaming queries to use on the source")
	destinationPackCount := subFlags.Int("destination_pack_count", defaultDestinationPackCount, "number of packets to pack in one destination insert")
	minTableSizeForSplit := subFlags.Int("min_table_size_for_split", defaultMinTableSizeForSplit, "tables bigger than this size on disk in bytes will be split into source_reader_count chunks if possible")
	destinationWriterCount := subFlags.Int("destination_writer_count", defaultDestinationWriterCount, "number of concurrent RPCs to execute on the destination")
	if err := subFlags.Parse(args); err != nil {
		return nil, err
	}
	if subFlags.NArg() != 1 {
		subFlags.Usage()
		return nil, fmt.Errorf("command VerticalSplitClone requires <destination keyspace/shard>")
	}

	keyspace, shard, err := topo.ParseKeyspaceShardString(subFlags.Arg(0))
	if err != nil {
		return nil, err
	}
	var tableArray []string
	if *tables != "" {
		tableArray = strings.Split(*tables, ",")
	}
	worker, err := NewVerticalSplitCloneWorker(wr, wi.cell, keyspace, shard, tableArray, *strategy, *sourceReaderCount, *destinationPackCount, uint64(*minTableSizeForSplit), *destinationWriterCount)
	if err != nil {
		return nil, fmt.Errorf("cannot create worker: %v", err)
	}
	return worker, nil
}

func doInitialize(fs *flag.FlagSet, argv []string) error {
	var (
		conffile = fs.String("conf", config.DefaultConfig.Conffile, "Config file path")
		apikey   = fs.String("apikey", "", "API key from mackerel.io web site (Required)")
	)
	fs.Parse(argv)

	if *apikey == "" {
		// Setting apikey via environment variable should be supported or not?
		return fmt.Errorf("-apikey option is required")
	}
	_, err := os.Stat(*conffile)
	confExists := err == nil
	if confExists {
		conf, err := config.LoadConfig(*conffile)
		if err != nil {
			return fmt.Errorf("Failed to load the config file: %s", err)
		}
		if conf.Apikey != "" {
			return apikeyAlreadySetError(*conffile)
		}
	}
	contents := []byte(fmt.Sprintf("apikey = %q\n", *apikey))
	if confExists {
		cBytes, err := ioutil.ReadFile(*conffile)
		if err != nil {
			return err
		}
		contents = append(contents, cBytes...)
	}
	return ioutil.WriteFile(*conffile, contents, 0644)
}

// Setup the parameters with the command line flags in args.
func (job *Job) Setup(fs *flag.FlagSet, args []string) error {
	taskfile := fs.String("task", "", "path to the task description (mandatory)")
	inputfile := fs.String("input", "", "path to the input file (mandatory)")
	fs.StringVar(&job.UmlPath, "uml", job.UmlPath, "path to the UML executable")
	fs.StringVar(&job.EnvDir, "envdir", job.EnvDir, "environments directory")
	fs.StringVar(&job.TasksDir, "tasksdir", job.TasksDir, "tasks directory")
	if err := fs.Parse(args); err != nil {
		return err
	}
	if len(*taskfile) == 0 || len(*inputfile) == 0 {
		return errors.New("Missing task or input file")
	}
	taskcontent, err := ioutil.ReadFile(*taskfile)
	if err != nil {
		return err
	}
	if json.Unmarshal(taskcontent, &job.Task) != nil {
		return err
	}
	inputcontent, err := ioutil.ReadFile(*inputfile)
	if err != nil {
		return err
	}
	job.Input = string(inputcontent)
	return nil
}

func (gc *GetCommand) Flags(fs *flag.FlagSet) *flag.FlagSet {
	gc.header = fs.Bool("H", false, "Display record header")
	gc.test = fs.Bool("t", false, "Test that the record can be retrieved")
	gc.separator = fs.String("s", "====", "Record separator")

	return fs
}

func mainReqs(args []string, flags *flag.FlagSet) {
	flags.Usage = func() {
		fmt.Fprintf(os.Stderr, "Usage: %s %s <package-name>\n", os.Args[0], args[0])
		flags.PrintDefaults()
	}
	file := flags.String("graphfile", "", fmt.Sprintf("Path to PyPI dependency graph file.  Defaults to $GOPATH/src/github.com/beyang/cheerio/data/pypi_graph"))
	flags.Parse(args[1:])

	if flags.NArg() < 1 {
		flags.Usage()
		os.Exit(1)
	}

	pkg := cheerio.NormalizedPkgName(flags.Arg(0))

	var pypiG *cheerio.PyPIGraph
	if *file == "" {
		pypiG = cheerio.DefaultPyPIGraph
	} else {
		var err error
		pypiG, err = cheerio.NewPyPIGraph(*file)
		if err != nil {
			fmt.Printf("Error creating PyPI graph: %s\n", err)
			os.Exit(1)
		}
	}

	pkgReq := pypiG.Requires(pkg)
	pkgReqBy := pypiG.RequiredBy(pkg)
	fmt.Printf("pkg %s uses (%d):\n  %s\nand is used by (%d):\n  %s\n", pkg, len(pkgReq), strings.Join(pkgReq, " "), len(pkgReqBy), strings.Join(pkgReqBy, " "))
}

func commandEmergencyReparentShard(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
	waitSlaveTimeout := subFlags.Duration("wait_slave_timeout", 30*time.Second, "time to wait for slaves to catch up in reparenting")
	keyspaceShard := subFlags.String("keyspace_shard", "", "keyspace/shard of the shard that needs to be reparented")
	newMaster := subFlags.String("new_master", "", "alias of a tablet that should be the new master")
	if err := subFlags.Parse(args); err != nil {
		return err
	}
	if subFlags.NArg() == 2 {
		// Legacy syntax: "<keyspace/shard> <tablet alias>".
		if *newMaster != "" {
			return fmt.Errorf("cannot use legacy syntax and flag -new_master for action EmergencyReparentShard at the same time")
		}
		*keyspaceShard = subFlags.Arg(0)
		*newMaster = subFlags.Arg(1)
	} else if subFlags.NArg() != 0 {
		return fmt.Errorf("action EmergencyReparentShard requires -keyspace_shard=<keyspace/shard> -new_master=<tablet alias>")
	}

	keyspace, shard, err := topoproto.ParseKeyspaceShard(*keyspaceShard)
	if err != nil {
		return err
	}
	tabletAlias, err := topoproto.ParseTabletAlias(*newMaster)
	if err != nil {
		return err
	}
	return wr.EmergencyReparentShard(ctx, keyspace, shard, tabletAlias, *waitSlaveTimeout)
}

func commandSplitClone(wi *Instance, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) (Worker, error) {
	online := subFlags.Bool("online", defaultOnline, "do online copy (optional approximate copy, source and destination tablets will not be put out of serving, minimizes downtime during offline copy)")
	offline := subFlags.Bool("offline", defaultOffline, "do offline copy (exact copy at a specific GTID, required before shard migration, source and destination tablets will be put out of serving during copy)")
	excludeTables := subFlags.String("exclude_tables", "", "comma separated list of tables to exclude")
	strategy := subFlags.String("strategy", "", "which strategy to use for restore, use 'vtworker SplitClone --strategy=-help k/s' for more info")
	sourceReaderCount := subFlags.Int("source_reader_count", defaultSourceReaderCount, "number of concurrent streaming queries to use on the source")
	writeQueryMaxRows := subFlags.Int("write_query_max_rows", defaultWriteQueryMaxRows, "maximum number of rows per write query")
	writeQueryMaxSize := subFlags.Int("write_query_max_size", defaultWriteQueryMaxSize, "maximum size (in bytes) per write query")
	writeQueryMaxRowsDelete := subFlags.Int("write_query_max_rows_delete", defaultWriteQueryMaxRows, "maximum number of rows per DELETE FROM write query")
	minTableSizeForSplit := subFlags.Int("min_table_size_for_split", defaultMinTableSizeForSplit, "tables bigger than this size on disk in bytes will be split into source_reader_count chunks if possible")
	destinationWriterCount := subFlags.Int("destination_writer_count", defaultDestinationWriterCount, "number of concurrent RPCs to execute on the destination")
	minHealthyRdonlyTablets := subFlags.Int("min_healthy_rdonly_tablets", defaultMinHealthyRdonlyTablets, "minimum number of healthy RDONLY tablets in the source and destination shard at start")
	maxTPS := subFlags.Int64("max_tps", defaultMaxTPS, "if non-zero, limit copy to maximum number of (write) transactions/second on the destination (unlimited by default)")
	if err := subFlags.Parse(args); err != nil {
		return nil, err
	}
	if subFlags.NArg() != 1 {
		subFlags.Usage()
		return nil, fmt.Errorf("command SplitClone requires <keyspace/shard>")
	}

	keyspace, shard, err := topoproto.ParseKeyspaceShard(subFlags.Arg(0))
	if err != nil {
		return nil, err
	}
	var excludeTableArray []string
	if *excludeTables != "" {
		excludeTableArray = strings.Split(*excludeTables, ",")
	}
	worker, err := NewSplitCloneWorker(wr, wi.cell, keyspace, shard, *online, *offline, excludeTableArray, *strategy, *sourceReaderCount, *writeQueryMaxRows, *writeQueryMaxSize, *writeQueryMaxRowsDelete, uint64(*minTableSizeForSplit), *destinationWriterCount, *minHealthyRdonlyTablets, *maxTPS)
	if err != nil {
		return nil, fmt.Errorf("cannot create split clone worker: %v", err)
	}
	return worker, nil
}

func commandVtGateExecute(ctx context.Context, wr *wrangler.Wrangler, subFlags *flag.FlagSet, args []string) error {
	server := subFlags.String("server", "", "VtGate server to connect to")
	bindVariables := newBindvars(subFlags)
	connectTimeout := subFlags.Duration("connect_timeout", 30*time.Second, "Connection timeout for vtgate client")
	tabletType := subFlags.String("tablet_type", "master", "tablet type to query")
	if err := subFlags.Parse(args); err != nil {
		return err
	}
	if subFlags.NArg() != 1 {
		return fmt.Errorf("the <sql> argument is required for the VtGateExecute command")
	}
	t, err := parseTabletType(*tabletType, []pb.TabletType{pb.TabletType_MASTER, pb.TabletType_REPLICA, pb.TabletType_RDONLY})
	if err != nil {
		return err
	}

	vtgateConn, err := vtgateconn.Dial(ctx, *server, *connectTimeout)
	if err != nil {
		return fmt.Errorf("error connecting to vtgate '%v': %v", *server, err)
	}
	defer vtgateConn.Close()
	qr, err := vtgateConn.Execute(ctx, subFlags.Arg(0), *bindVariables, t)
	if err != nil {
		return fmt.Errorf("Execute failed: %v", err)
	}
	return printJSON(wr, qr)
}

// newCommandUnsub creates and returns an unsub command.
func newCommandUnsub(args []string, cli *client.Client) (command, error) {
	// Create a flag set.
	var flg flag.FlagSet

	// Define the flags.
	topicFilter := flg.String("t", "", "Topic Filter")

	// Parse the flag.
	if err := flg.Parse(args); err != nil {
		return nil, errCmdArgsParse
	}

	// Create an unsub command.
	cmd := &commandUnsub{
		cli: cli,
		unsubscribeOpts: &client.UnsubscribeOptions{
			TopicFilters: [][]byte{
				[]byte(*topicFilter),
			},
		},
	}

	// Return the command.
	return cmd, nil
}

// newCommandPub creates and returns a pub command.
func newCommandPub(args []string, cli *client.Client) (command, error) {
	// Create a flag set.
	var flg flag.FlagSet

	// Define the flags.
	qos := flg.Uint("q", uint(mqtt.QoS0), "QoS")
	retain := flg.Bool("r", false, "Retain")
	topicName := flg.String("t", "", "Topic Name")
	message := flg.String("m", "", "Application Message")

	// Parse the flag.
	if err := flg.Parse(args); err != nil {
		return nil, errCmdArgsParse
	}

	// Create a pub command.
	cmd := &commandPub{
		cli: cli,
		publishOpts: &client.PublishOptions{
			QoS:       byte(*qos),
			Retain:    *retain,
			TopicName: []byte(*topicName),
			Message:   []byte(*message),
		},
	}

	// Return the command.
	return cmd, nil
}

func AddFlags(flags *flag.FlagSet) {
	flags.String(
		DebugFlag,
		"",
		"host:port for serving pprof debugging info",
	)
}