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: main.go
    path of file: ./repos/storj/cmd/storj-sim
    
    the code of the file until where you have to start completion: // Copyright (C) 2019 Storj Labs, Inc.
// See LICENSE for copying information.

package main

import (
	"context"
	"fmt"
	"math"
	"os"
	"time"

	"github.com/spf13/cobra"

	"storj.io/common/fpath"
	"storj.io/common/sync2"
)

// Flags contains different flags for commands.
type Flags struct {
	Directory string
	Host      string

	SatelliteCount   int
	StorageNodeCount int
	Identities       int

	NoGateways bool

	IsDev    bool
	FailFast bool

	OnlyEnv bool // only do things necessary for loading env vars

	// Connection string for the postgres database to use for storj-sim processes
	Postgres string
	Redis    string

	// Value of first redis db
	RedisStartDB int
}

var printCommands bool

func main() {
	cobra.EnableCommandSorting = false

	var flags Flags

	rootCmd := &cobra.Command{
		Use:   "storj-sim",
		Short: "Storj Network Simulator",
	}

	defaultConfigDir := fpath.ApplicationDir("storj", "local-network")

	configDir := defaultConfigDir
	if os.Getenv("STORJ_NETWORK_DIR") != "" {
		configDir = os.Getenv("STORJ_NETWORK_DIR")
	}

	rootCmd.PersistentFlags().StringVarP(&flags.Directory, "config-dir", "", configDir, "base project directory")
	rootCmd.PersistentFlags().StringVarP(&flags.Host, "host", "", "127.0.0.1", "host to use for network")

	rootCmd.PersistentFlags().IntVarP(&flags.SatelliteCount, "satellites", "", 1, "number of satellites to start")
	rootCmd.PersistentFlags().IntVarP(&fl
    
func main() {
	cobra.EnableCommandSorting = false

	var flags Flags

	rootCmd := &cobra.Command{
		Use:   "storj-sim",
		Short: "Storj Network Simulator",
	}

	defaultConfigDir := fpath.ApplicationDir("storj", "local-network")

	configDir := defaultConfigDir
	if os.Getenv("STORJ_NETWORK_DIR") != "" {
		configDir = os.Getenv("STORJ_NETWORK_DIR")
	}

	rootCmd.PersistentFlags().StringVarP(&flags.Directory, "config-dir", "", configDir, "base project directory")
	rootCmd.PersistentFlags().StringVarP(&flags.Host, "host", "", "127.0.0.1", "host to use for network")

	rootCmd.PersistentFlags().IntVarP(&flags.SatelliteCount, "satellites", "", 1, "number of satellites to start")
	rootCmd.PersistentFlags().IntVarP(&flags.StorageNodeCount, "storage-nodes", "", 10, "number of storage nodes to start")
	rootCmd.PersistentFlags().IntVarP(&flags.Identities, "identities", "", 10, "number of identities to create")

	rootCmd.PersistentFlags().BoolVarP(&flags.NoGateways, "no-gateways", "", false, "whether to disable gateway creation for each satellite")

	rootCmd.PersistentFlags().BoolVarP(&printCommands, "print-commands", "x", false, "print commands as they are run")
	rootCmd.PersistentFlags().BoolVarP(&flags.IsDev, "dev", "", true, "use configuration values tuned for development")
	rootCmd.PersistentFlags().BoolVarP(&flags.FailFast, "failfast", "", true, "stop all processes when one of the processes fails")

	rootCmd.PersistentFlags().StringVarP(&flags.Postgres, "postgres", "", os.Getenv("STORJ_SIM_POSTGRES"), "connection string for postgres (defaults to STORJ_SIM_POSTGRES)")
	rootCmd.PersistentFlags().StringVarP(&flags.Redis, "redis", "", os.Getenv("STORJ_SIM_REDIS"), "connection string for redis e.g. 127.0.0.1:6379 (defaults to STORJ_SIM_REDIS)")
	rootCmd.PersistentFlags().IntVarP(&flags.RedisStartDB, "redis-startdb", "", 0, "value of first redis db (defaults to 0)")

	networkCmd := &cobra.Command{
		Use:   "network",
		Short: "local network for testing",
	}

	networkCmd.AddCommand(
		&cobra.Command{
			Use:   "run",
			Short: "run network",
			RunE: func(cmd *cobra.Command, args []string) (err error) {
				return networkExec(&flags, args, "run")
			},
		}, &cobra.Command{
			Use:   "env [name]",
			Short: "print environment variables",
			RunE: func(cmd *cobra.Command, args []string) (err error) {
				return networkEnv(&flags, args)
			},
		}, &cobra.Command{
			Use:   "setup",
			Short: "setup network",
			RunE: func(cmd *cobra.Command, args []string) (err error) {
				return networkExec(&flags, args, "setup")
			},
		}, &cobra.Command{
			Use:   "test <command>",
			Short: "run command with an actual network",
			Args:  cobra.MinimumNArgs(1),
			RunE: func(cmd *cobra.Command, args []string) (err error) {
				return networkTest(&flags, args[0], args[1:])
			},
		}, &cobra.Command{
			Use:   "destroy",
			Short: "destroys network if it exists",
			RunE: func(cmd *cobra.Command, args []string) (err error) {
				return networkDestroy(&flags, args)
			},
		},
	)

	toolCmd := &cobra.Command{
		Use:   "tool",
		Short: "tools for working with storj-sim",
	}

	toolCmd.AddCommand(
		func() *cobra.Command {
			cmd := &cobra.Command{
				Use:   "wait-for <address>",
				Short: "waits for an address to accept connections",
				Args:  cobra.ExactArgs(1),
			}
			retries := cmd.Flags().Int("retry", -1, "maximum retry count")
			interval := cmd.Flags().Duration("interval", 50*time.Millisecond, "how long to wait after each retry")

			cmd.RunE = func(cmd *cobra.Command, args []string) (err error) {
				ctx, cancel := NewCLIContext(context.Background())
				defer cancel()
				defer fmt.Println()

				target := args[0]

				if *retries <= 0 {
					*retries = math.MaxInt32
				}
				for try := 0; try < *retries; try++ {
					if tryConnect(target) {
						return nil
					}
					fmt.Print(".")

					if !sync2.Sleep(ctx, *interval) {
						return ctx.Err()
					}
				}

				return fmt.Errorf("failed to connect to %q", target)
			}
			return cmd
		}(),
	)

	rootCmd.AddCommand(
		networkCmd,
		toolCmd,
	)
	rootCmd.SilenceUsage = true
	err := rootCmd.Execute()
	if err != nil {
		os.Exit(1)
	}
}