Golang NewCommand Examples

Example #1

File: main.go Project: nolenroyalty/bangarang

// Run determines and runs the command specified by the CLI args.
func (m *Main) Run(args ...string) error {
	name, args := ParseCommandName(args)

	// Extract name from args.
	switch name {
	case "", "run":
		cmd := run.NewCommand()

		// Tell the server the build details.
		cmd.Version = version
		cmd.Commit = commit

		if err := cmd.Run(args...); err != nil {
			return fmt.Errorf("run: %s", err)
		}

		// Wait indefinitely.
		<-(chan struct{})(nil)

	case "backup":
		name := backup.NewCommand()
		if err := name.Run(args...); err != nil {
			return fmt.Errorf("backup: %s", err)
		}
	case "restore":
		name := restore.NewCommand()
		if err := name.Run(args...); err != nil {
			return fmt.Errorf("restore: %s", err)
		}
	case "config":
		if err := run.NewPrintConfigCommand().Run(args...); err != nil {
			return fmt.Errorf("config: %s", err)
		}
	case "version":
		if err := NewVersionCommand().Run(args...); err != nil {
			return fmt.Errorf("version: %s", err)
		}
	case "help":
		if err := help.NewCommand().Run(args...); err != nil {
			return fmt.Errorf("help: %s", err)
		}
	default:
		return fmt.Errorf(`unknown command "%s"`+"\n"+`Run 'influxd help' for usage`+"\n\n", name)
	}

	return nil
}

Example #2

File: main.go Project: KoeSystems/influxdb

// Run determines and runs the command specified by the CLI args.
func (m *Main) Run(args ...string) error {
	name, args := ParseCommandName(args)

	// Extract name from args.
	switch name {
	case "", "run":
		cmd := run.NewCommand()

		// Tell the server the build details.
		cmd.Version = version
		cmd.Commit = commit
		cmd.Branch = branch

		if err := cmd.Run(args...); err != nil {
			return fmt.Errorf("run: %s", err)
		}

		signalCh := make(chan os.Signal, 1)
		signal.Notify(signalCh, os.Interrupt, syscall.SIGTERM)
		m.Logger.Println("Listening for signals")

		// Block until one of the signals above is received
		select {
		case <-signalCh:
			m.Logger.Println("Signal received, initializing clean shutdown...")
			go func() {
				cmd.Close()
			}()
		}

		// Block again until another signal is received, a shutdown timeout elapses,
		// or the Command is gracefully closed
		m.Logger.Println("Waiting for clean shutdown...")
		select {
		case <-signalCh:
			m.Logger.Println("second signal received, initializing hard shutdown")
		case <-time.After(time.Second * 30):
			m.Logger.Println("time limit reached, initializing hard shutdown")
		case <-cmd.Closed:
			m.Logger.Println("server shutdown completed")
		}

		// goodbye.

	case "backup":
		name := backup.NewCommand()
		if err := name.Run(args...); err != nil {
			return fmt.Errorf("backup: %s", err)
		}
	case "restore":
		name := restore.NewCommand()
		if err := name.Run(args...); err != nil {
			return fmt.Errorf("restore: %s", err)
		}
	case "config":
		if err := run.NewPrintConfigCommand().Run(args...); err != nil {
			return fmt.Errorf("config: %s", err)
		}
	case "version":
		if err := NewVersionCommand().Run(args...); err != nil {
			return fmt.Errorf("version: %s", err)
		}
	case "help":
		if err := help.NewCommand().Run(args...); err != nil {
			return fmt.Errorf("help: %s", err)
		}
	default:
		return fmt.Errorf(`unknown command "%s"`+"\n"+`Run 'influxd help' for usage`+"\n\n", name)
	}

	return nil
}