服务计算——CLI 命令行实用程序开发实战 Agenda

本周的课程作业是开发一个Agenda项目，由于不要求组队，所以老师简化内容为实现两条指令即可。其中我完成了Register（注册）和login（登陆）两个功能：

• 用户注册

1. 注册新用户时，用户需设置一个唯一的用户名和一个密码。另外，还需登记邮箱及电话信息。
2. 如果注册时提供的用户名已由其他用户使用，应反馈一个适当的出错信息；成功注册后，亦应反馈一个成功注册的信息。 用户登录

• 用户登录

1. 用户使用用户名和密码登录 Agenda 系统。
2. 用户名和密码同时正确则登录成功并反馈一个成功登录的信息。否则，登录失败并反馈一个失败登录的信息。

安装Cobra

1. 安装依赖包
   在$GOPATH/src/golang.org/x目录下，下载sys和text项目：

git clone https://github.com/golang/sys
git clone https://github.com/golang/text

执行 go get -v github.com/spf13/cobra/cobra


安装成功后，$GOPATH/bin下会生成cobra可执行程序
2. 创建程序
创建目录App1并初始化：

mkdir -p App1
cd App1
cobra init --pkg-name github.com/github-user/App1

设计程序

1. 在程序目录下，添加register、login两个文件：

cobra add register
cobra add login

2. 创建一个新的文件夹entity, 存放程序的实体信息
3. rigister.go的内容如下：

package cmd

import (
	"App1/entity"
	"log"

	"github.com/spf13/cobra"
)

var registerCmd = &cobra.Command{
	Use:   "register",
	Short: "A brief description of your command",
	Long: `A longer description that spans multiple lines and likely contains examples
and usage of using your command. For example:
Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.`,
	Run: func(cmd *cobra.Command, args []string) {
		_username, _ := cmd.Flags().GetString("user")
		_password, _ := cmd.Flags().GetString("password")
		_email, _ := cmd.Flags().GetString("email")
		_phone, _ := cmd.Flags().GetString("phone")
		log.Println("register called by "+_username, _password, _email, _phone)
		if _username == "default user" {
			log.Println("username can't be empty,plz try again")
			return
		}
		users := entity.READUSERS()
		for i := 0; i < len(users); i++ {
			if users[i].Username == _username {
				log.Println("username already registered")
				return
			}
		}
		aUser := entity.User{Username: _username, Password: _password, Email: _email, Phone: _phone}
		users = append(users, aUser)
		entity.WRITEUSER(users)
	},
}

func init() {
	rootCmd.AddCommand(registerCmd)

	registerCmd.Flags().StringP("user", "u", "default user", "Help message for username")
	registerCmd.Flags().StringP("password", "P", "123456", "password for user") 
	registerCmd.Flags().StringP("email", "e", "[email protected]", "email of user")
	registerCmd.Flags().StringP("phone", "p", "18700011134", "phone of the user")
}

login.go:

package cmd

import (
	"App1/entity"
	"log"
	"github.com/spf13/cobra"
)

var loginCmd = &cobra.Command{
	Use:   "login",
	Short: "A brief description of your command",
	Long: `A longer description that spans multiple lines and likely contains examples
and usage of using your command. For example:
Cobra is a CLI library for Go that empowers applications.
This application is a tool to generate the needed files
to quickly create a Cobra application.`,
	Run: func(cmd *cobra.Command, args []string) {
		_userName_, _ := cmd.Flags().GetString("user")
		_password_, _ := cmd.Flags().GetString("pass")
		users := entity.READUSERS()
		for _, user := range users {
			if user.Username == _userName_ {
				//密码匹配
				if user.Password == _password_ {
					entity.SetCurrentUserName(_userName_)
					log.Println("Log in Success!")
					log.Println("Welcome! " + _userName_)
					return
				} else { //密码错误
					log.Println("Warning! Wrong Password")
					return
				}
			}
		}
		log.Println("Warning! Wrong UserName")
		return
	},
}

func init() {
	rootCmd.AddCommand(loginCmd)
	loginCmd.Flags().StringP("user", "u", "", "log in")
	loginCmd.Flags().StringP("pass", "p", "", "log in")
}

4. 测试：
   执行go run App1

go run App1 register -u usrname -p password -e email -p pnumber 注册用户

   go run App1 login -u usrname -p password 用户登陆

   重复注册，则会出现报错：username already registered
   

5. 项目结构
   如下所示：
   
   项目传送门