Golang 微框架 Gin 简介

 router.GET("/render", func(c *gin.Context) {
        contentType := c.DefaultQuery("content_type", "json")
        if contentType == "json" {
            c.JSON(http.StatusOK, gin.H{
                "user":   "rsj217",
                "passwd": "123",
            })
        } else if contentType == "xml" {
            c.XML(http.StatusOK, gin.H{
                "user":   "rsj217",
                "passwd": "123",
            })
        }

    })

?  ~  curl  http://127.0.0.1:8000/render\?content_type\=json
{"passwd":"123","user":"rsj217"}
?  ~  curl  http://127.0.0.1:8000/render\?content_type\=xml
<map><user>rsj217</user><passwd>123</passwd></map>%

 router.GET("/redict/google", func(c *gin.Context) {
        c.Redirect(http.StatusMovedPermanently, "https://google.com")
    })

  v1 := router.Group("/v1")

    v1.GET("/login", func(c *gin.Context) {
        c.String(http.StatusOK, "v1 login")
    })

    v2 := router.Group("/v2")

    v2.GET("/login", func(c *gin.Context) {
        c.String(http.StatusOK, "v2 login")
    })

?  ~  curl http://127.0.0.1:8000/v1/login
v1 login%                                                                                 ?  ~  curl http://127.0.0.1:8000/v2/login
v2 login%

func MiddleWare() gin.HandlerFunc {
    return func(c *gin.Context) {
        fmt.Println("before middleware")
        c.Set("request", "clinet_request")
        c.Next()
        fmt.Println("before middleware")
    }
}

 router.Use(MiddleWare())
    {
        router.GET("/middleware", func(c *gin.Context) {
            request := c.MustGet("request").(string)
            req, _ := c.Get("request")
            c.JSON(http.StatusOK, gin.H{
                "middile_request": request,
                "request": req,
            })
        })
    }

?  ~  curl  http://127.0.0.1:8000/middleware
{"middile_request":"clinet_request","request":"clinet_request"}

    router.GET("/before", MiddleWare(), func(c *gin.Context) {
        request := c.MustGet("request").(string)
        c.JSON(http.StatusOK, gin.H{
            "middile_request": request,
        })
    })

authorized := router.Group("/", MyMiddelware())
// 或者这样用：
authorized := router.Group("/")
authorized.Use(MyMiddelware())
{
    authorized.POST("/login", loginEndpoint)
}

    router.GET("/auth/signin", func(c *gin.Context) {
        cookie := &http.Cookie{
            Name:     "session_id",
            Value:    "123",
            Path:     "/",
            HttpOnly: true,
        }
        http.SetCookie(c.Writer, cookie)
        c.String(http.StatusOK, "Login successful")
    })

    router.GET("/home", AuthMiddleWare(), func(c *gin.Context) {
        c.JSON(http.StatusOK, gin.H{"data": "home"})
    })

func AuthMiddleWare() gin.HandlerFunc {
    return func(c *gin.Context) {
        if cookie, err := c.Request.Cookie("session_id"); err == nil {
            value := cookie.Value
            fmt.Println(value)
            if value == "123" {
                c.Next()
                return
            }
        }
        c.JSON(http.StatusUnauthorized, gin.H{
            "error": "Unauthorized",
        })
        c.Abort()
        return
    }
}

In [7]: resp = requests.get(‘http://127.0.0.1:8000/home‘)

In [8]: resp.json()
Out[8]: {u‘error‘: u‘Unauthorized‘}

In [9]: login = requests.get(‘http://127.0.0.1:8000/auth/signin‘)

In [10]: login.cookies
Out[10]: <RequestsCookieJar[Cookie(version=0, name=‘session_id‘, value=‘123‘, port=None, port_specified=False, domain=‘127.0.0.1‘, domain_specified=False, domain_initial_dot=False, path=‘/‘, path_specified=True, secure=False, expires=None, discard=True, comment=None, comment_url=None, rest={‘HttpOnly‘: None}, rfc2109=False)]>

In [11]: resp = requests.get(‘http://127.0.0.1:8000/home‘, cookies=login.cookies)

In [12]: resp.json()
Out[12]: {u‘data‘: u‘home‘}

 router.GET("/sync", func(c *gin.Context) {
        time.Sleep(5 * time.Second)
        log.Println("Done! in path" + c.Request.URL.Path)
    })

    router.GET("/async", func(c *gin.Context) {
        cCp := c.Copy()
        go func() {
            time.Sleep(5 * time.Second)
            log.Println("Done! in path" + cCp.Request.URL.Path)
        }()
    })

func main() {
    router := gin.Default()
    http.ListenAndServe(":8080", router)
}

或者

func main() {
    router := gin.Default()

    s := &http.Server{
        Addr:           ":8000",
        Handler:        router,
        ReadTimeout:    10 * time.Second,
        WriteTimeout:   10 * time.Second,
        MaxHeaderBytes: 1 << 20,
    }
    s.ListenAndServe()
}