golang web 封装之路由

概述

一般的 web项目，主要两点：路由 和 数据库。围绕这两点之外就是业务逻辑。下面以几个例子简单谈谈 web项目的封装逻辑。

封装方式一、路由写在 main函数中，数据库初始连接放在 init() 函数中。地址

func init() {
	db.Connect()
}

func main() {

	// Configure
	router := gin.Default()

	// Set html render options
	htmlRender := GinHTMLRender.New()
	htmlRender.Debug = gin.IsDebugging()
	htmlRender.Layout = "layouts/default"
	// htmlRender.TemplatesDir = "templates/" // default
	// htmlRender.Ext = ".html"               // default

	// Tell gin to use our html render
	router.HTMLRender = htmlRender.Create()

	router.RedirectTrailingSlash = true
	router.RedirectFixedPath = true

	// Middlewares
	router.Use(middlewares.Connect)
	router.Use(middlewares.ErrorHandler)

	// Statics
	router.Static("/public", "./public")

	// Routes

	router.GET("/", func(c *gin.Context) {
		c.Redirect(http.StatusMovedPermanently, "/articles")
	})

	// Articles
	router.GET("/new", articles.New)
	router.GET("/articles/:_id", articles.Edit)
	router.GET("/articles", articles.List)
	router.POST("/articles", articles.Create)
	router.POST("/articles/:_id", articles.Update)
	router.POST("/delete/articles/:_id", articles.Delete)

	// Start listening
	port := Port
	if len(os.Getenv("PORT")) > 0 {
		port = os.Getenv("PORT")
	}
	router.Run(":" + port)
}

封装方式二、路由和 db单独封装到一个函数中，以传参的形式将路由传给另一个函数。地址

func SetUpServer() {
	r := gin.Default()

	// secret 相当于签名
	store, _ := sessions.NewRedisStore(10, "tcp", CONFIG.Redis.Host, CONFIG.Redis.Password, []byte(CONFIG.Server.Secret))
	r.Use(sessions.Sessions("session", store))

	r.Use(gin.Recovery())
	r.Use(Uniquify())

	r.LoadHTMLGlob("templates/*")
	r.Static("/static", "public/")

	SetUpRoutes(r)

	r.GET("/incr", func(c *gin.Context) {
		c.JSON(200, gin.H{"count": c.MustGet("key").(string)})
	})

	// var port string

	r.Run(":" + CONFIG.Server.Port)
}

封装三、将路由等封装到 Server struct 中。对此 Server 创建一个 new函数，路由等相关内容只包含在方法中。（面向对象）地址

type Server struct {
	Ws     *melody.Melody
	Routes *gin.Engine
	Games  []*Game
}

func New() *Server {
	ws := melody.New()
	routes := gin.Default()
	games := make([]*Game, 0)

	return &Server{
		Ws:     ws,
		Routes: routes,
		Games:  games,
	}
}


...
...


func (srv *Server) RoutesInit() {
	srv.Routes.GET("/jq.js", func(c *gin.Context) {
		http.ServeFile(c.Writer, c.Request, "html/jq.js")
	})

	srv.Routes.GET("/goyaniv.js", func(c *gin.Context) {
		http.ServeFile(c.Writer, c.Request, "html/goyaniv.js")
	})
	srv.Routes.GET("/game/:name", func(c *gin.Context) {
		cookiekey, _ := c.Request.Cookie("goyanivkey")
		cookieid, _ := c.Request.Cookie("goyanivid")
		if cookieid == nil || cookiekey == nil {
			cookieid := CreateCookie("goyanivkey", GenerateUnique())
			cookiekey := CreateCookie("goyanivid", GenerateUnique())
			http.SetCookie(c.Writer, cookieid)
			http.SetCookie(c.Writer, cookiekey)
		}
		http.ServeFile(c.Writer, c.Request, "html/game.html")
	})
	srv.Routes.GET("/gamedev/:name", func(c *gin.Context) {
		cookiekey, _ := c.Request.Cookie("goyanivkey")
		cookieid, _ := c.Request.Cookie("goyanivid")
		if cookieid == nil || cookiekey == nil {
			cookieid := CreateCookie("goyanivkey", GenerateUnique())
			cookiekey := CreateCookie("goyanivid", GenerateUnique())
			http.SetCookie(c.Writer, cookieid)
			http.SetCookie(c.Writer, cookiekey)
		}
		http.ServeFile(c.Writer, c.Request, "html/gamedev.html")
	})

	srv.Routes.GET("/game/:name/ws", func(c *gin.Context) {
		srv.Ws.HandleRequest(c.Writer, c.Request)
	})

	srv.Routes.GET("/gamedev/:name/ws", func(c *gin.Context) {
		srv.Ws.HandleRequest(c.Writer, c.Request)
	})

	srv.Ws.HandleMessage(func(s *melody.Session, msg []byte) {
		FireMessage(srv, s, msg)
	})

	srv.Ws.HandleDisconnect(func(s *melody.Session) {
		FireDisconnect(srv, s)
	})

	srv.Ws.HandleConnect(func(s *melody.Session) {
		FireConnect(srv, s)
	})
}

func (s *Server) Run() {
	s.RoutesInit()
	s.Routes.Run(":5000")
}

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