cmd.go

package cmd

import (
	"crypto/tls"
	"crypto/x509"
	"fmt"
	"io/ioutil"
	"math/rand"
	"os"
	"os/exec"
	"runtime/debug"
	"sort"
	"strings"
	"sync"
	"time"
	"unicode"

	"github.com/2637309949/micro/v3/client/cli/namespace"
	clitoken "github.com/2637309949/micro/v3/client/cli/token"
	"github.com/2637309949/micro/v3/client/cli/util"
	_ "github.com/2637309949/micro/v3/cmd/usage"
	"github.com/2637309949/micro/v3/plugin"
	"github.com/2637309949/micro/v3/profile"
	"github.com/2637309949/micro/v3/service/auth"
	authSrv "github.com/2637309949/micro/v3/service/auth/client"
	"github.com/2637309949/micro/v3/service/broker"
	brokerSrv "github.com/2637309949/micro/v3/service/broker/client"
	"github.com/2637309949/micro/v3/service/client"
	grpcCli "github.com/2637309949/micro/v3/service/client/grpc"
	"github.com/2637309949/micro/v3/service/config"
	configCli "github.com/2637309949/micro/v3/service/config/client"
	storeConf "github.com/2637309949/micro/v3/service/config/store"
	"github.com/2637309949/micro/v3/service/errors"
	"github.com/2637309949/micro/v3/service/events"
	eventsSrv "github.com/2637309949/micro/v3/service/events/client"
	"github.com/2637309949/micro/v3/service/logger"
	"github.com/2637309949/micro/v3/service/metrics"
	noopMet "github.com/2637309949/micro/v3/service/metrics/noop"
	"github.com/2637309949/micro/v3/service/network"
	mucpNet "github.com/2637309949/micro/v3/service/network/mucp"
	"github.com/2637309949/micro/v3/service/registry"
	registrySrv "github.com/2637309949/micro/v3/service/registry/client"
	"github.com/2637309949/micro/v3/service/router"
	routerSrv "github.com/2637309949/micro/v3/service/router/client"
	"github.com/2637309949/micro/v3/service/runtime"
	runtimeSrv "github.com/2637309949/micro/v3/service/runtime/client"
	"github.com/2637309949/micro/v3/service/server"
	grpcSvr "github.com/2637309949/micro/v3/service/server/grpc"
	"github.com/2637309949/micro/v3/service/store"
	storeSrv "github.com/2637309949/micro/v3/service/store/client"
	uconf "github.com/2637309949/micro/v3/util/config"
	"github.com/2637309949/micro/v3/util/helper"
	"github.com/2637309949/micro/v3/util/report"
	"github.com/2637309949/micro/v3/util/user"
	"github.com/2637309949/micro/v3/util/wrapper"
	"github.com/google/uuid"
	"github.com/urfave/cli/v2"

	muruntime "github.com/2637309949/micro/v3/service/runtime"
)

type Cmd interface {
	// Init initialises options
	// Note: Use Run to parse command line
	Init(opts ...Option) error
	// Options set within this command
	Options() Options
	// The cli app within this cmd
	App() *cli.App
	// Run executes the command
	Run() error
	// Implementation
	String() string
}

type command struct {
	opts Options
	app  *cli.App

	// before is a function which should
	// be called in Before if not nil
	before cli.ActionFunc

	// indicates whether this is a service
	service bool
}

var (
	DefaultCmd Cmd = New()

	onceBefore sync.Once

	// name of the binary
	name = "micro"
	// description of the binary
	description = "A framework for cloud native development\n\n	 Use `micro [command] --help` to see command specific help."
	// defaultFlags which are used on all commands
	defaultFlags = []cli.Flag{
		&cli.StringFlag{
			Name:    "c",
			Usage:   "Set the config file: Defaults to ~/.micro/config.json",
			EnvVars: []string{"MICRO_CONFIG_FILE"},
		},
		&cli.StringFlag{
			Name:    "env",
			Aliases: []string{"e"},
			Usage:   "Set the environment to operate in",
			EnvVars: []string{"MICRO_ENV"},
		},
		&cli.StringFlag{
			Name:    "profile",
			Usage:   "Set the micro server profile: e.g. local or kubernetes",
			EnvVars: []string{"MICRO_PROFILE"},
		},
		&cli.StringFlag{
			Name:    "namespace",
			EnvVars: []string{"MICRO_NAMESPACE"},
			Usage:   "Namespace the service is operating in",
			Value:   "micro",
		},
		&cli.StringFlag{
			Name:    "auth_address",
			EnvVars: []string{"MICRO_AUTH_ADDRESS"},
			Usage:   "Comma-separated list of auth addresses",
		},
		&cli.StringFlag{
			Name:    "auth_id",
			EnvVars: []string{"MICRO_AUTH_ID"},
			Usage:   "Account ID used for client authentication",
		},
		&cli.StringFlag{
			Name:    "auth_secret",
			EnvVars: []string{"MICRO_AUTH_SECRET"},
			Usage:   "Account secret used for client authentication",
		},
		&cli.StringFlag{
			Name:    "auth_public_key",
			EnvVars: []string{"MICRO_AUTH_PUBLIC_KEY"},
			Usage:   "Public key for JWT auth (base64 encoded PEM)",
		},
		&cli.StringFlag{
			Name:    "auth_private_key",
			EnvVars: []string{"MICRO_AUTH_PRIVATE_KEY"},
			Usage:   "Private key for JWT auth (base64 encoded PEM)",
		},
		&cli.StringFlag{
			Name:    "registry_address",
			EnvVars: []string{"MICRO_REGISTRY_ADDRESS"},
			Usage:   "Comma-separated list of registry addresses",
		},
		&cli.StringFlag{
			Name:    "registry_tls_ca",
			Usage:   "Certificate authority for TLS with registry",
			EnvVars: []string{"MICRO_REGISTRY_TLS_CA"},
		},
		&cli.StringFlag{
			Name:    "registry_tls_cert",
			Usage:   "Client cert for TLS with registry",
			EnvVars: []string{"MICRO_REGISTRY_TLS_CERT"},
		},
		&cli.StringFlag{
			Name:    "registry_tls_key",
			Usage:   "Client key for TLS with registry",
			EnvVars: []string{"MICRO_REGISTRY_TLS_KEY"},
		},
		&cli.StringFlag{
			Name:    "broker_address",
			EnvVars: []string{"MICRO_BROKER_ADDRESS"},
			Usage:   "Comma-separated list of broker addresses",
		},
		&cli.StringFlag{
			Name:    "events_tls_ca",
			Usage:   "Certificate authority for TLS with events",
			EnvVars: []string{"MICRO_EVENTS_TLS_CA"},
		},
		&cli.StringFlag{
			Name:    "events_tls_cert",
			Usage:   "Client cert for TLS with events",
			EnvVars: []string{"MICRO_EVENTS_TLS_CERT"},
		},
		&cli.StringFlag{
			Name:    "events_tls_key",
			Usage:   "Client key for TLS with events",
			EnvVars: []string{"MICRO_EVENTS_TLS_KEY"},
		},
		&cli.StringFlag{
			Name:    "broker_tls_ca",
			Usage:   "Certificate authority for TLS with broker",
			EnvVars: []string{"MICRO_BROKER_TLS_CA"},
		},
		&cli.StringFlag{
			Name:    "broker_tls_cert",
			Usage:   "Client cert for TLS with broker",
			EnvVars: []string{"MICRO_BROKER_TLS_CERT"},
		},
		&cli.StringFlag{
			Name:    "broker_tls_key",
			Usage:   "Client key for TLS with broker",
			EnvVars: []string{"MICRO_BROKER_TLS_KEY"},
		},
		&cli.StringFlag{
			Name:    "store_address",
			EnvVars: []string{"MICRO_STORE_ADDRESS"},
			Usage:   "Comma-separated list of store addresses",
		},
		&cli.StringFlag{
			Name:    "proxy_address",
			Usage:   "Proxy requests via the HTTP address specified",
			EnvVars: []string{"MICRO_PROXY"},
		},
		&cli.BoolFlag{
			Name:    "report_usage",
			Usage:   "Report usage statistics",
			EnvVars: []string{"MICRO_REPORT_USAGE"},
			Value:   true,
		},
		&cli.StringFlag{
			Name:    "service_name",
			Usage:   "Name of the micro service",
			EnvVars: []string{"MICRO_SERVICE_NAME"},
		},
		&cli.StringFlag{
			Name:    "service_version",
			Usage:   "Version of the micro service",
			EnvVars: []string{"MICRO_SERVICE_VERSION"},
		},
		&cli.StringFlag{
			Name:    "service_address",
			Usage:   "Address to run the service on",
			EnvVars: []string{"MICRO_SERVICE_ADDRESS"},
		},
		&cli.StringFlag{
			Name:    "config_secret_key",
			Usage:   "Key to use when encoding/decoding secret config values. Will be generated and saved to file if not provided.",
			Value:   "",
			EnvVars: []string{"MICRO_CONFIG_SECRET_KEY"},
		},
		&cli.StringFlag{
			Name:    "tracing_reporter_address",
			Usage:   "The host:port of the opentracing agent e.g. localhost:6831",
			EnvVars: []string{"MICRO_TRACING_REPORTER_ADDRESS"},
		},
	}
)

func init() {
	rand.Seed(time.Now().Unix())

	// configure defaults for all packages
	setupDefaults()
}

// setupDefaults sets the default auth, broker etc implementations incase they arent configured by
// a profile. The default implementations are always the RPC implementations.
func setupDefaults() {
	client.DefaultClient = grpcCli.NewClient()
	server.DefaultServer = grpcSvr.NewServer()
	network.DefaultNetwork = mucpNet.NewNetwork()
	metrics.DefaultMetricsReporter = noopMet.New()

	// setup rpc implementations after the client is configured
	auth.DefaultAuth = authSrv.NewAuth()
	broker.DefaultBroker = brokerSrv.NewBroker()
	events.DefaultStream = eventsSrv.NewStream()
	events.DefaultStore = eventsSrv.NewStore()
	registry.DefaultRegistry = registrySrv.NewRegistry()
	router.DefaultRouter = routerSrv.NewRouter()
	store.DefaultStore = storeSrv.NewStore()
	store.DefaultBlobStore = storeSrv.NewBlobStore()
	runtime.DefaultRuntime = runtimeSrv.NewRuntime()
}

func formatErr(err error) string {
	switch v := err.(type) {
	case *errors.Error:
		return upcaseInitial(v.Detail)
	default:
		return upcaseInitial(err.Error())
	}
}

func upcaseInitial(str string) string {
	for i, v := range str {
		return string(unicode.ToUpper(v)) + str[i+1:]
	}
	return ""
}

// setupAuthForCLI handles exchanging refresh tokens to access tokens
// The structure of the local micro userconfig file is the following:
// micro.auth.[envName].token: temporary access token
// micro.auth.[envName].refresh-token: long lived refresh token
// micro.auth.[envName].expiry: expiration time of the access token, seconds since Unix epoch.
func setupAuthForCLI(ctx *cli.Context) error {
	env, err := util.GetEnv(ctx)
	if err != nil {
		return err
	}
	ns, err := namespace.Get(env.Name)
	if err != nil {
		return err
	}

	tok, err := clitoken.Get(ctx)
	if err != nil {
		return err
	}

	// If there is no refresh token, do not try to refresh it
	if len(tok.RefreshToken) == 0 {
		return nil
	}

	// Check if token is valid
	if time.Now().Before(tok.Expiry.Add(time.Minute * -1)) {
		auth.DefaultAuth.Init(
			auth.ClientToken(tok),
			auth.Issuer(ns),
		)
		return nil
	}

	// Get new access token from refresh token if it's close to expiry
	tok, err = auth.Token(
		auth.WithToken(tok.RefreshToken),
		auth.WithTokenIssuer(ns),
		auth.WithExpiry(time.Minute*10),
	)
	if err != nil {
		return nil
	}

	// Save the token to user config file
	auth.DefaultAuth.Init(
		auth.ClientToken(tok),
		auth.Issuer(ns),
	)
	return clitoken.Save(ctx, tok)
}

// setupAuthForService generates auth credentials for the service
func setupAuthForService() error {
	opts := auth.DefaultAuth.Options()

	// extract the account creds from options, these can be set by flags
	accID := opts.ID
	accSecret := opts.Secret

	// if no credentials were provided, self generate an account
	if len(accID) == 0 || len(accSecret) == 0 {
		opts := []auth.GenerateOption{
			auth.WithType("service"),
			auth.WithScopes("service"),
		}

		acc, err := auth.Generate(uuid.New().String(), opts...)
		if err != nil {
			return err
		}
		if logger.V(logger.DebugLevel, logger.DefaultLogger) {
			logger.Debugf("Auth [%v] Generated an auth account", auth.DefaultAuth.String())
		}

		accID = acc.ID
		accSecret = acc.Secret
	}

	// generate the first token
	token, err := auth.Token(
		auth.WithCredentials(accID, accSecret),
		auth.WithExpiry(time.Minute*10),
	)
	if err != nil {
		return err
	}

	// set the credentials and token in auth options
	auth.DefaultAuth.Init(
		auth.ClientToken(token),
		auth.Credentials(accID, accSecret),
	)
	return nil
}

// refreshAuthToken if it is close to expiring
func refreshAuthToken() {
	// can't refresh a token we don't have
	if auth.DefaultAuth.Options().Token == nil {
		return
	}

	t := time.NewTicker(time.Second * 15)
	defer t.Stop()

	for {
		select {
		case <-t.C:
			// don't refresh the token if it's not close to expiring
			tok := auth.DefaultAuth.Options().Token
			if tok.Expiry.Unix() > time.Now().Add(time.Minute).Unix() {
				continue
			}

			// generate the first token
			tok, err := auth.Token(
				auth.WithToken(tok.RefreshToken),
				auth.WithExpiry(time.Minute*10),
			)
			if err == auth.ErrInvalidToken {
				logger.Warnf("[Auth] Refresh token expired, regenerating using account credentials")

				tok, err = auth.Token(
					auth.WithCredentials(
						auth.DefaultAuth.Options().ID,
						auth.DefaultAuth.Options().Secret,
					),
					auth.WithExpiry(time.Minute*10),
				)
			} else if err != nil {
				logger.Warnf("[Auth] Error refreshing token: %v", err)
				continue
			}

			// set the token
			logger.Debugf("Auth token refreshed, expires at %v", tok.Expiry.Format(time.UnixDate))
			auth.DefaultAuth.Init(auth.ClientToken(tok))
		}
	}
}

func action(c *cli.Context) error {
	if c.Args().Len() > 0 {
		// if an executable is available with the name of
		// the command, execute it with the arguments from
		// index 1 on.
		v, err := exec.LookPath("micro-" + c.Args().First())
		if err == nil {
			ce := exec.Command(v, c.Args().Slice()[1:]...)
			ce.Stdout = os.Stdout
			ce.Stderr = os.Stderr
			return ce.Run()
		}

		// lookup the service, e.g. "micro config set" would
		// firstly check to see if the service, e.g. config
		// exists within the current namespace, then it would
		// execute the Config.Set RPC, setting the flags in the
		// request.
		if srv, ns, err := util.LookupService(c); err != nil {
			return util.CliError(err)
		} else if srv != nil && util.ShouldRenderHelp(c) {
			return cli.Exit(util.FormatServiceUsage(srv, c), 0)
		} else if srv != nil {
			err := util.CallService(srv, ns, c)
			return util.CliError(err)
		}

		// srv == nil
		return helper.UnexpectedCommand(c)

	}

	return helper.MissingCommand(c)
}

func New(opts ...Option) *command {
	options := Options{}
	for _, o := range opts {
		o(&options)
	}

	cmd := new(command)
	cmd.opts = options
	cmd.app = cli.NewApp()
	cmd.app.Name = name
	cmd.app.Version = buildVersion()
	cmd.app.Usage = description
	cmd.app.Flags = defaultFlags
	cmd.app.Action = action
	cmd.app.Before = beforeFromContext(options.Context, cmd.Before)

	// if this option has been set, we're running a service
	// and no action needs to be performed. The CMD package
	// is just being used to parse flags and configure micro.
	if setupOnlyFromContext(options.Context) {
		cmd.service = true
		cmd.app.Action = func(ctx *cli.Context) error { return nil }
	}

	//flags to add
	if len(options.Flags) > 0 {
		cmd.app.Flags = append(cmd.app.Flags, options.Flags...)
	}
	//action to replace
	if options.Action != nil {
		cmd.app.Action = options.Action
	}
	// cmd to add to use registry

	return cmd
}

func (c *command) App() *cli.App {
	return c.app
}

func (c *command) Options() Options {
	return c.opts
}

// Before is executed before any subcommand
func (c *command) Before(ctx *cli.Context) error {
	// set the config file if specified
	if cf := ctx.String("c"); len(cf) > 0 {
		uconf.SetConfig(cf)
	}

	// initialize plugins
	for _, p := range plugin.Plugins() {
		if err := p.Init(ctx); err != nil {
			return err
		}
	}

	// certain commands don't require loading
	if ctx.Args().First() == "env" {
		return nil
	}

	// default the profile for the server
	prof := ctx.String("profile")

	// if no profile is set then set one
	if len(prof) == 0 {
		switch ctx.Args().First() {
		case "service", "server":
			prof = "server"
		default:
			prof = "client"
		}
	}

	logger.Debugf("Loading profile %s", prof)
	// apply the profile
	if profile, err := profile.Load(prof); err != nil {
		logger.Fatal(err)
	} else {
		// load the profile
		profile.Setup(ctx)
	}

	// set the proxy address
	var proxy string
	if c.service || ctx.IsSet("proxy_address") {
		// use the proxy address passed as a flag, this is normally
		// the micro network
		proxy = ctx.String("proxy_address")
	} else {
		// for CLI, use the external proxy which is loaded from the
		// local config
		var err error
		proxy, err = util.CLIProxyAddress(ctx)
		if err != nil {
			return err
		}
	}
	if len(proxy) > 0 {
		client.DefaultClient.Init(client.Proxy(proxy))
	}

	// use the internal network lookup
	client.DefaultClient.Init(
		client.Lookup(network.Lookup),
	)

	onceBefore.Do(func() {
		// wrap the client
		client.DefaultClient = wrapper.AuthClient(client.DefaultClient)
		client.DefaultClient = wrapper.TraceCall(client.DefaultClient)
		client.DefaultClient = wrapper.LogClient(client.DefaultClient)
		client.DefaultClient = wrapper.OpentraceClient(client.DefaultClient)

		// wrap the server
		server.DefaultServer.Init(
			server.WrapHandler(wrapper.AuthHandler()),
			server.WrapHandler(wrapper.TraceHandler()),
			server.WrapHandler(wrapper.HandlerStats()),
			server.WrapHandler(wrapper.LogHandler()),
			server.WrapHandler(wrapper.MetricsHandler()),
			server.WrapHandler(wrapper.OpenTraceHandler()),
		)
	})

	// setup auth
	authOpts := []auth.Option{}
	if len(ctx.String("namespace")) > 0 {
		authOpts = append(authOpts, auth.Issuer(ctx.String("namespace")))
	}
	if len(ctx.String("auth_address")) > 0 {
		authOpts = append(authOpts, auth.Addrs(ctx.String("auth_address")))
	}
	if len(ctx.String("auth_id")) > 0 || len(ctx.String("auth_secret")) > 0 {
		authOpts = append(authOpts, auth.Credentials(
			ctx.String("auth_id"), ctx.String("auth_secret"),
		))
	}

	// load the jwt private and public keys, in the case of the server we want to generate them if not
	// present. The server will inject these creds into the core services, if the services generated
	// the credentials themselves then they wouldn't match
	if len(ctx.String("auth_public_key")) > 0 || len(ctx.String("auth_private_key")) > 0 {
		authOpts = append(authOpts, auth.PublicKey(ctx.String("auth_public_key")))
		authOpts = append(authOpts, auth.PrivateKey(ctx.String("auth_private_key")))
	} else if ctx.Args().First() == "server" || ctx.Args().First() == "service" {
		privKey, pubKey, err := user.GetJWTCerts()
		if err != nil {
			logger.Fatalf("Error getting keys: %v", err)
		}
		authOpts = append(authOpts, auth.PublicKey(string(pubKey)), auth.PrivateKey(string(privKey)))
	}

	auth.DefaultAuth.Init(authOpts...)

	// setup auth credentials, use local credentials for the CLI and injected creds
	// for the service.
	var err error
	if c.service {
		err = setupAuthForService()
	} else {
		err = setupAuthForCLI(ctx)
	}
	if err != nil {
		logger.Fatalf("Error setting up auth: %v", err)
	}
	go refreshAuthToken()

	// initialize the server with the namespace so it knows which domain to register in
	server.DefaultServer.Init(server.Namespace(ctx.String("namespace")))

	// setup registry
	registryOpts := []registry.Option{}

	// Parse registry TLS certs
	if len(ctx.String("registry_tls_cert")) > 0 || len(ctx.String("registry_tls_key")) > 0 {
		cert, err := tls.LoadX509KeyPair(ctx.String("registry_tls_cert"), ctx.String("registry_tls_key"))
		if err != nil {
			logger.Fatalf("Error loading registry tls cert: %v", err)
		}

		// load custom certificate authority
		caCertPool := x509.NewCertPool()
		if len(ctx.String("registry_tls_ca")) > 0 {
			crt, err := ioutil.ReadFile(ctx.String("registry_tls_ca"))
			if err != nil {
				logger.Fatalf("Error loading registry tls certificate authority: %v", err)
			}
			caCertPool.AppendCertsFromPEM(crt)
		}

		cfg := &tls.Config{Certificates: []tls.Certificate{cert}, RootCAs: caCertPool}
		registryOpts = append(registryOpts, registry.TLSConfig(cfg))
	}
	if len(ctx.String("registry_address")) > 0 {
		addresses := strings.Split(ctx.String("registry_address"), ",")
		registryOpts = append(registryOpts, registry.Addrs(addresses...))
	}
	if err := registry.DefaultRegistry.Init(registryOpts...); err != nil {
		logger.Fatalf("Error configuring registry: %v", err)
	}

	// Setup broker options.
	brokerOpts := []broker.Option{}
	if len(ctx.String("broker_address")) > 0 {
		brokerOpts = append(brokerOpts, broker.Addrs(ctx.String("broker_address")))
	}

	// Parse broker TLS certs
	if len(ctx.String("broker_tls_cert")) > 0 || len(ctx.String("broker_tls_key")) > 0 {
		cert, err := tls.LoadX509KeyPair(ctx.String("broker_tls_cert"), ctx.String("broker_tls_key"))
		if err != nil {
			logger.Fatalf("Error loading broker TLS cert: %v", err)
		}

		// load custom certificate authority
		caCertPool := x509.NewCertPool()
		if len(ctx.String("broker_tls_ca")) > 0 {
			crt, err := ioutil.ReadFile(ctx.String("broker_tls_ca"))
			if err != nil {
				logger.Fatalf("Error loading broker TLS certificate authority: %v", err)
			}
			caCertPool.AppendCertsFromPEM(crt)
		}

		cfg := &tls.Config{Certificates: []tls.Certificate{cert}, RootCAs: caCertPool}
		brokerOpts = append(brokerOpts, broker.TLSConfig(cfg))
	}
	if err := broker.DefaultBroker.Init(brokerOpts...); err != nil {
		logger.Fatalf("Error configuring broker: %v", err)
	}
	if err := broker.DefaultBroker.Connect(); err != nil {
		logger.Fatalf("Error connecting to broker: %v", err)
	}

	// Setup runtime. This is a temporary fix to trigger the runtime to recreate
	// its client now the client has been replaced with a wrapped one.
	if err := muruntime.DefaultRuntime.Init(); err != nil {
		logger.Fatalf("Error configuring runtime: %v", err)
	}

	// Setup store options
	storeOpts := []store.StoreOption{}
	if len(ctx.String("store_address")) > 0 {
		storeOpts = append(storeOpts, store.Nodes(strings.Split(ctx.String("store_address"), ",")...))
	}
	if len(ctx.String("namespace")) > 0 {
		storeOpts = append(storeOpts, store.Database(ctx.String("namespace")))
	}
	if len(ctx.String("service_name")) > 0 {
		storeOpts = append(storeOpts, store.Table(ctx.String("service_name")))
	}
	if err := store.DefaultStore.Init(storeOpts...); err != nil {
		logger.Fatalf("Error configuring store: %v", err)
	}

	// set the registry and broker in the client and server
	client.DefaultClient.Init(
		client.Broker(broker.DefaultBroker),
		client.Registry(registry.DefaultRegistry),
	)
	server.DefaultServer.Init(
		server.Broker(broker.DefaultBroker),
		server.Registry(registry.DefaultRegistry),
	)

	// Setup config. Do this after auth is configured since it'll load the config
	// from the service immediately. We only do this if the action is nil, indicating
	// a service is being run
	if c.service && config.DefaultConfig == nil {
		config.DefaultConfig = configCli.NewConfig(ctx.String("namespace"))
	} else if config.DefaultConfig == nil {
		config.DefaultConfig, _ = storeConf.NewConfig(store.DefaultStore, ctx.String("namespace"))
	}

	return nil
}

func (c *command) Init(opts ...Option) error {
	for _, o := range opts {
		o(&c.opts)
	}
	if len(c.opts.Name) > 0 {
		c.app.Name = c.opts.Name
	}
	if len(c.opts.Version) > 0 {
		c.app.Version = c.opts.Version
	}
	c.app.HideVersion = len(c.opts.Version) == 0
	c.app.Usage = c.opts.Description

	//allow user's flags to add
	if len(c.opts.Flags) > 0 {
		c.app.Flags = append(c.app.Flags, c.opts.Flags...)
	}
	//action to replace
	if c.opts.Action != nil {
		c.app.Action = c.opts.Action
	}

	return nil
}

func (c *command) Run() error {
	defer func() {
		if r := recover(); r != nil {
			report.Errorf(nil, fmt.Sprintf("panic: %v", string(debug.Stack())))
			panic(r)
		}
	}()
	return c.app.Run(os.Args)
}

func (c *command) String() string {
	return "micro"
}

// Register CLI commands
func Register(cmds ...*cli.Command) {
	app := DefaultCmd.App()
	app.Commands = append(app.Commands, cmds...)

	// sort the commands so they're listed in order on the cli
	// todo: move this to micro/cli so it's only run when the
	// commands are printed during "help"
	sort.Slice(app.Commands, func(i, j int) bool {
		return app.Commands[i].Name < app.Commands[j].Name
	})
}

// Run the default command
func Run() {
	if err := DefaultCmd.Run(); err != nil {
		fmt.Println(formatErr(err))
		os.Exit(1)
	}
}