Golang Context.Args方法代码示例

func actionMemberList(c *cli.Context) {
	if len(c.Args()) != 0 {
		fmt.Fprintln(os.Stderr, "No arguments accepted")
		os.Exit(1)
	}
	mAPI := mustNewMembersAPI(c)
	ctx, cancel := contextWithTotalTimeout(c)
	defer cancel()

	members, err := mAPI.List(ctx)
	if err != nil {
		fmt.Fprintln(os.Stderr, err.Error())
		os.Exit(1)
	}
	leader, err := mAPI.Leader(ctx)
	if err != nil {
		fmt.Fprintln(os.Stderr, "Failed to get leader: ", err)
		os.Exit(1)
	}

	for _, m := range members {
		isLeader := false
		if m.ID == leader.ID {
			isLeader = true
		}
		if len(m.Name) == 0 {
			fmt.Printf("%s[unstarted]: peerURLs=%s\n", m.ID, strings.Join(m.PeerURLs, ","))
		} else {
			fmt.Printf("%s: name=%s peerURLs=%s clientURLs=%s isLeader=%v\n", m.ID, m.Name, strings.Join(m.PeerURLs, ","), strings.Join(m.ClientURLs, ","), isLeader)
		}
	}
}

// txnCommandFunc executes the "txn" command.
func txnCommandFunc(c *cli.Context) {
	if len(c.Args()) != 0 {
		panic("unexpected args")
	}

	reader := bufio.NewReader(os.Stdin)

	next := compareState
	txn := &pb.TxnRequest{}
	for next != nil {
		next = next(txn, reader)
	}

	conn, err := grpc.Dial("127.0.0.1:12379")
	if err != nil {
		panic(err)
	}
	etcd := pb.NewEtcdClient(conn)

	resp, err := etcd.Txn(context.Background(), txn)
	if err != nil {
		fmt.Println(err)
	}
	if resp.Succeeded {
		fmt.Println("executed success request list")
	} else {
		fmt.Println("executed failure request list")
	}
}

// removeDirCommandFunc executes the "rmdir" command.
func removeDirCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	if len(c.Args()) == 0 {
		return nil, errors.New("Key required")
	}
	key := c.Args()[0]

	return client.DeleteDir(key)
}

// watchCommandFunc executes the "watch" command.
func watchCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	if len(c.Args()) == 0 {
		return nil, errors.New("Key required")
	}
	key := c.Args()[0]
	recursive := c.Bool("recursive")
	forever := c.Bool("forever")

	index := 0
	if c.Int("after-index") != 0 {
		index = c.Int("after-index") + 1
	}

	if forever {
		sigch := make(chan os.Signal, 1)
		signal.Notify(sigch, os.Interrupt)
		stop := make(chan bool)

		go func() {
			<-sigch
			os.Exit(0)
		}()

		receiver := make(chan *etcd.Response)
		errCh := make(chan error, 1)

		go func() {
			_, err := client.Watch(key, uint64(index), recursive, receiver, stop)
			errCh <- err
		}()

		for {
			select {
			case resp := <-receiver:
				printAll(resp, c.GlobalString("output"))
			case err := <-errCh:
				handleError(-1, err)
			}
		}

	} else {
		var resp *etcd.Response
		var err error
		resp, err = client.Watch(key, uint64(index), recursive, nil, nil)

		if err != nil {
			handleError(ErrorFromEtcd, err)
		}

		if err != nil {
			return nil, err
		}
		printAll(resp, c.GlobalString("output"))
	}

	return nil, nil
}

// setDirCommandFunc executes the "setDir" command.
func setDirCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	if len(c.Args()) == 0 {
		return nil, errors.New("Key required")
	}
	key := c.Args()[0]
	ttl := c.Int("ttl")

	return client.SetDir(key, uint64(ttl))
}

// getCommandFunc executes the "get" command.
func getCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	if len(c.Args()) == 0 {
		return nil, errors.New("Key required")
	}
	key := c.Args()[0]
	sorted := c.Bool("sort")

	// Retrieve the value from the server.
	return client.Get(key, sorted, false)
}

// lsCommandFunc executes the "ls" command.
func lsCommandFunc(c *cli.Context, client *etcd.Client) (*etcd.Response, error) {
	key := "/"
	if len(c.Args()) != 0 {
		key = c.Args()[0]
	}
	recursive := c.Bool("recursive")

	// Retrieve the value from the server.
	return client.Get(key, false, recursive)
}

func mustUserAPIAndName(c *cli.Context) (client.AuthUserAPI, string) {
	args := c.Args()
	if len(args) != 1 {
		fmt.Fprintln(os.Stderr, "Please provide a username")
		os.Exit(1)
	}

	api := mustNewAuthUserAPI(c)
	username := args[0]
	return api, username
}

func mustRoleAPIAndName(c *cli.Context) (client.AuthRoleAPI, string) {
	args := c.Args()
	if len(args) != 1 {
		fmt.Fprintln(os.Stderr, "Please provide a role name")
		os.Exit(1)
	}

	name := args[0]
	api := mustNewAuthRoleAPI(c)
	return api, name
}

// updatedirCommandFunc executes the "updatedir" command.
func updatedirCommandFunc(c *cli.Context, ki client.KeysAPI) {
	if len(c.Args()) == 0 {
		handleError(ExitBadArgs, errors.New("key required"))
	}
	key := c.Args()[0]
	ttl := c.Int("ttl")
	ctx, cancel := contextWithTotalTimeout(c)
	_, err := ki.Set(ctx, key, "", &client.SetOptions{TTL: time.Duration(ttl) * time.Second, Dir: true, PrevExist: client.PrevExist})
	cancel()
	if err != nil {
		handleError(ExitServerError, err)
	}
}

// mkdirCommandFunc executes the "mkdir" command.
func mkdirCommandFunc(c *cli.Context, ki client.KeysAPI, prevExist client.PrevExistType) {
	if len(c.Args()) == 0 {
		handleError(ExitBadArgs, errors.New("key required"))
	}

	key := c.Args()[0]
	ttl := c.Int("ttl")

	_, err := ki.Set(context.TODO(), key, "", &client.SetOptions{TTL: time.Duration(ttl) * time.Second, Dir: true, PrevExist: prevExist})
	if err != nil {
		handleError(ExitServerError, err)
	}
}

// deleteRangeCommandFunc executes the "delegeRange" command.
func deleteRangeCommandFunc(c *cli.Context) {
	if len(c.Args()) == 0 {
		panic("bad arg")
	}

	var rangeEnd []byte
	key := []byte(c.Args()[0])
	if len(c.Args()) > 1 {
		rangeEnd = []byte(c.Args()[1])
	}
	conn, err := grpc.Dial(c.GlobalString("endpoint"))
	if err != nil {
		panic(err)
	}
	etcd := pb.NewEtcdClient(conn)
	req := &pb.DeleteRangeRequest{Key: key, RangeEnd: rangeEnd}

	etcd.DeleteRange(context.Background(), req)

	if rangeEnd != nil {
		fmt.Printf("range [%s, %s) is deleted\n", string(key), string(rangeEnd))
	} else {
		fmt.Printf("key %s is deleted\n", string(key))
	}
}

// rmdirCommandFunc executes the "rmdir" command.
func rmdirCommandFunc(c *cli.Context, ki client.KeysAPI) {
	if len(c.Args()) == 0 {
		handleError(ExitBadArgs, errors.New("key required"))
	}
	key := c.Args()[0]

	resp, err := ki.Delete(context.TODO(), key, &client.DeleteOptions{Dir: true})
	if err != nil {
		handleError(ExitServerError, err)
	}

	if !resp.Node.Dir {
		printResponseKey(resp, c.GlobalString("output"))
	}
}

// lsCommandFunc executes the "ls" command.
func lsCommandFunc(c *cli.Context, ki client.KeysAPI) {
	key := "/"
	if len(c.Args()) != 0 {
		key = c.Args()[0]
	}

	sort := c.Bool("sort")
	recursive := c.Bool("recursive")

	resp, err := ki.Get(context.TODO(), key, &client.GetOptions{Sort: sort, Recursive: recursive})
	if err != nil {
		handleError(ExitServerError, err)
	}

	printLs(c, resp)
}

func actionMemberAdd(c *cli.Context) {
	args := c.Args()
	if len(args) != 2 {
		fmt.Fprintln(os.Stderr, "Provide a name and a single member peerURL")
		os.Exit(1)
	}

	mAPI := mustNewMembersAPI(c)

	url := args[1]
	ctx, cancel := context.WithTimeout(context.Background(), client.DefaultRequestTimeout)
	m, err := mAPI.Add(ctx, url)
	cancel()
	if err != nil {
		fmt.Fprintln(os.Stderr, err.Error())
		os.Exit(1)
	}

	newID := m.ID
	newName := args[0]
	fmt.Printf("Added member named %s with ID %s to cluster\n", newName, newID)

	ctx, cancel = context.WithTimeout(context.Background(), client.DefaultRequestTimeout)
	members, err := mAPI.List(ctx)
	cancel()
	if err != nil {
		fmt.Fprintln(os.Stderr, err.Error())
		os.Exit(1)
	}

	conf := []string{}
	for _, memb := range members {
		for _, u := range memb.PeerURLs {
			n := memb.Name
			if memb.ID == newID {
				n = newName
			}
			conf = append(conf, fmt.Sprintf("%s=%s", n, u))
		}
	}

	fmt.Print("\n")
	fmt.Printf("ETCD_NAME=%q\n", newName)
	fmt.Printf("ETCD_INITIAL_CLUSTER=%q\n", strings.Join(conf, ","))
	fmt.Printf("ETCD_INITIAL_CLUSTER_STATE=\"existing\"\n")
}