通过Beego将之前实现的短url项目实现

正好通过这个小例子对之前了解的beego框架的基本内容进行一个简单的应用

实现的完整代码地址：https://github.com/pythonsite/go_simple_code/tree/master/beego_short_url

数据库没有什么变化，还是和之前一样，主要是把处理逻辑放到beego中就可以了

代码的主要目录为：

localhost:beego_short_url zhaofan$ tree
.
├── beego_short_url
├── conf
│   └── app.conf
├── controllers
│   ├── default.go
│   └── short_url.go
├── main.go
├── models
│   └── data.go
├── routers
│   └── router.go
├── static
│   ├── css
│   ├── img
│   └── js
│       └── reload.min.js
├── tests
│   └── default_test.go
└── views
    └── index.tpl

10 directories, 10 files

关于长短url相互转换的的请求和返回定义的struct在models下的data中，代码为：

package models

type Long2ShortRequest struct {
    OriginUrl string `json:"origin_url"`
}

type ResponseHeader struct {
    Code int `json:"code"`
    Message string `json:"message"`
}

type Long2ShortResponse struct {
    ResponseHeader
    ShortUrl string `json:"short_url"`
}

type Short2LongRequest struct {
    ShortUrl string `json:"short_url"`
}

type Short2LongResponse struct {
    ResponseHeader
    OriginUrl string `json:"origin_url"`
}

type ShortUrl struct {
    ShortUrl string `json:"short_url" db:"short_url"`
}

而将原来在logic中的处理逻辑都放到了controllers中的short_url文件中

package controllers

import (
    "github.com/astaxie/beego"
    "beego_short_url/models"
    "encoding/json"
    "database/sql"
    "crypto/md5"
    "github.com/jmoiron/sqlx"
    "fmt"
    _ "github.com/go-sql-driver/mysql"
)

var (
    Db *sqlx.DB
)

func InitDb()(err error){
    Db, err = sqlx.Open("mysql",beego.AppConfig.String("Db::dsn"))
    if err != nil{
        beego.Error("connect to mysql failed:",err)
        return
    }
    return
}

type ShortUrl struct {
    Id int64 `db:"id"`
    ShortUrl string `db:"short_url"`
    OriginUrl string `db:"origin_url"`
    HashCode string `db:"hash_code"`
}

type ShortUrlController struct {
    beego.Controller
}

func (c *ShortUrlController) Jump() {
    shortUrl := c.GetString("shorturl")
    if len(shortUrl) == 0{
        return
    }
    var req models.Short2LongRequest
    var resp *models.Short2LongResponse = &models.Short2LongResponse{}

    defer func(){
        if err := recover();err != nil{
            beego.Error("panic err:",err)
            //resp.Code = 500
            //resp.Message = "server busy"
            //c.Data["json"] = resp
            //c.ServeJSON()
            return
        }
    }()
    req.ShortUrl = shortUrl
    resp,err := Short2Long(&req)
    if err != nil{
        beego.Error("short2Long failed error:",err)
        return
    }

    beego.Info("origin url:%s short url:%s",resp.OriginUrl,shortUrl)
    c.Redirect(resp.OriginUrl,301)
}

func (c *ShortUrlController) ShortUrlList() {
    limit,err := c.GetInt("limit")
    if err != nil{
        beego.Warn("not have limit params use default 10")
        limit = 10
    }
    data,err := GetLastShortUrl(limit)
    if err != nil{
        beego.Error("from db get url list error:",err)

    }

    for i,v:= range data{
        v.ShortUrl = fmt.Sprintf("/jump/?shorturl=%s",v.ShortUrl)
        data[i] = v
    }

    c.Data["url_list"] = data
    c.TplName = "index.tpl"
}

func(c *ShortUrlController) Long2Short(){
    var req models.Long2ShortRequest
    var resp *models.Long2ShortResponse = &models.Long2ShortResponse{}

    defer func(){
        if err := recover();err != nil{
            beego.Error("panic err:",err)
            resp.Code = 500
            resp.Message = "server busy"
            c.Data["json"] = resp
            c.ServeJSON()
            return
        }
    }()

    err := json.Unmarshal(c.Ctx.Input.RequestBody,&req)
    if err != nil{
        beego.Error("unmarshal failed,err:",err)
        resp.Code = 1001
        resp.Message = "json unmarshal failed"
        c.Data["json"] = resp
        c.ServeJSON()
        return
    }
    resp,err = Long2Short(&req)
    if err != nil{
        beego.Error("long2short failed,err:",err)
        resp.Code = 1002
        resp.Message = "long2short failed"
        c.Data["json"] = resp
        c.ServeJSON()
        return
    }
    c.Data["json"] = resp
    c.ServeJSON()

}

func(c *ShortUrlController) Short2Long(){
    var req models.Short2LongRequest
    var resp *models.Short2LongResponse = &models.Short2LongResponse{}

    defer func(){
        if err := recover();err != nil{
            beego.Error("panic err:",err)
            resp.Code = 500
            resp.Message = "server busy"
            c.Data["json"] = resp
            c.ServeJSON()
            return
        }
    }()

    err := json.Unmarshal(c.Ctx.Input.RequestBody,&req)
    if err != nil{
        beego.Error("unmarshal failed,err:",err)
        resp.Code = 1001
        resp.Message = "json unmarshal failed"
        c.Data["json"] = resp
        c.ServeJSON()
        return
    }
    resp,err = Short2Long(&req)
    if err != nil{
        beego.Error("Short2Long failed,err:",err)
        resp.Code = 1002
        resp.Message = "long2short failed"
        c.Data["json"] = resp
        c.ServeJSON()
        return
    }
    c.Data["json"] = resp
    c.ServeJSON()
}

func Long2Short(req *models.Long2ShortRequest) (response *models.Long2ShortResponse, err error) {
    response = &models.Long2ShortResponse{}
    urlMd5 := fmt.Sprintf("%x",md5.Sum([]byte(req.OriginUrl)))
    var short ShortUrl
    err = Db.Get(&short,"select id,short_url,origin_url,hash_code from short_url where hash_code=?",urlMd5)
    if err == sql.ErrNoRows{
        err = nil
        // 数据库中没有记录，重新生成一个新的短url
        shortUrl,errRet := generateShortUrl(req,urlMd5)
        if errRet != nil{
            err = errRet
            return
        }
        response.ShortUrl = shortUrl
        return
    }
    if err != nil{
        return
    }
    response.ShortUrl = short.ShortUrl
    return
}

func generateShortUrl(req *models.Long2ShortRequest,hashcode string)(shortUrl string,err error){
    result,err := Db.Exec("insert INTO short_url(origin_url,hash_code)VALUES (?,?)",req.OriginUrl,hashcode)
    if err != nil{
        return
    }
    // 0-9a-zA-Z 六十二进制
    insertId,_:= result.LastInsertId()
    shortUrl = transTo62(insertId)
    _,err = Db.Exec("update short_url set short_url=? where id=?",shortUrl,insertId)
    if err != nil{
        fmt.Println(err)
        return
    }
    return
}

// 将十进制转换为62进制   0-9a-zA-Z 六十二进制
func transTo62(id int64)string{
    // 1 -- > 1
    // 10-- > a
    // 61-- > Z
    charset := "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
    var shortUrl []byte
    for{
        var result byte
        number := id % 62
        result = charset[number]
        var tmp []byte
        tmp = append(tmp,result)
        shortUrl = append(tmp,shortUrl...)
        id = id / 62
        if id == 0{
            break
        }
    }
    fmt.Println(string(shortUrl))
    return string(shortUrl)
}

func Short2Long(req *models.Short2LongRequest) (response *models.Short2LongResponse, err error) {
    response = &models.Short2LongResponse{}
    var short ShortUrl
    err = Db.Get(&short,"select id,short_url,origin_url,hash_code from short_url where short_url=?",req.ShortUrl)
    if err == sql.ErrNoRows{
        response.Code = 404
        return
    }
    if err != nil{
        response.Code = 500
        return
    }
    response.OriginUrl = short.OriginUrl
    return
}

func GetLastShortUrl(limit int)(result []*models.ShortUrl,err error){
    err = Db.Select(&result,"select short_url from short_url ORDER BY id DESC  limit ? ",limit)
    return
}

在这里添加了一些之前没有的功能：
获取数据库所有的short url 并且显示在页面上了，不过这里非常丑，如图：

我们可以通过点击相应的连接就会跳转到长url的页面
也可以通过模拟发送post请求来查看转换的情况：