7天用Go从零实现Web框架Gee

Gee 的设计与实现参考了Gin，这个教程可以快速入门：Go Gin简明教程。

教程目录

• 第一天：前置知识(http.Handler接口)，Code - Github
• 第二天：Context上下文设计，Code - Github
• 第三天：Tire树路由(Router)，Code - Github
• 第四天：分组控制(Group)，Code - Github
• 第五天：中间件(Middleware)，Code - Github
• 第六天：HTML模板(Template)
• 第七天：异常错误处理(Panic)

Day 1 - Static Route

func main() {
	r := gee.New()
	r.GET("/", func(w http.ResponseWriter, req *http.Request) {
		fmt.Fprintf(w, "URL.Path = %q\n", req.URL.Path)
	})

	r.GET("/hello", func(w http.ResponseWriter, req *http.Request) {
		for k, v := range req.Header {
			fmt.Fprintf(w, "Header[%q] = %q\n", k, v)
		}
	})

	r.Run(":9999")
}

Day 2 - Context Design

func main() {
	r := gee.New()
	r.GET("/", func(c *gee.Context) {
		c.HTML(http.StatusOK, "<h1>Hello Gee</h1>")
	})
	r.GET("/hello", func(c *gee.Context) {
		// expect /hello?name=geektutu
		c.String(http.StatusOK, "hello %s, you're at %s\n", c.Query("name"), c.Path)
	})

	r.POST("/login", func(c *gee.Context) {
		c.JSON(http.StatusOK, &map[string]string{
			"username": c.PostForm("username"),
			"password": c.PostForm("password"),
		})
	})

	r.Run(":9999")
}

Day 3 - Dynamic Route

func main() {
	r := gee.New()
	r.GET("/", func(c *gee.Context) {
		c.HTML(http.StatusOK, "<h1>Hello Gee</h1>")
	})

	r.GET("/hello", func(c *gee.Context) {
		// expect /hello?name=geektutu
		c.String(http.StatusOK, "hello %s, you're at %s\n", c.Query("name"), c.Path)
	})

	r.GET("/hello/:name", func(c *gee.Context) {
		// expect /hello/geektutu
		c.String(http.StatusOK, "hello %s, you're at %s\n", c.Param("name"), c.Path)
	})

	r.POST("/login", func(c *gee.Context) {
		c.JSON(http.StatusOK, &map[string]string{
			"username": c.PostForm("username"),
			"password": c.PostForm("password"),
		})
	})

	r.Run(":9999")
}

Day 4 - Nesting Group Control

func main() {
	r := gee.New()
	v1 := r.Group("/v1")
	{
		v1.GET("/", func(c *gee.Context) {
			c.HTML(http.StatusOK, "<h1>Hello Gee</h1>")
		})

		v1.GET("/hello", func(c *gee.Context) {
			// expect /hello?name=geektutu
			c.String(http.StatusOK, "hello %s, you're at %s\n", c.Query("name"), c.Path)
		})
	}
	v2 := r.Group("/v2")
	{
		v2.GET("/hello/:name", func(c *gee.Context) {
			// expect /hello/geektutu
			c.String(http.StatusOK, "hello %s, you're at %s\n", c.Param("name"), c.Path)
		})
		v2.POST("/login", func(c *gee.Context) {
			c.JSON(http.StatusOK, &map[string]string{
				"username": c.PostForm("username"),
				"password": c.PostForm("password"),
			})
		})

	}

	r.Run(":9999")
}

Day 5 - Middleware

func onlyForV2() gee.HandlerFunc {
	return func(c *gee.Context) {
		// Start timer
		t := time.Now()
		// Process request
		c.Next()
		// Calculate resolution time
		log.Printf("[%d] %s in %v for group v2", c.StatusCode, c.Req.RequestURI, time.Since(t))
	}
}

func main() {
	r := gee.New()
	r.Use(gee.Logger()) // global midlleware
	r.GET("/", func(c *gee.Context) {
		c.HTML(http.StatusOK, "<h1>Hello Gee</h1>")
	})

	v2 := r.Group("/v2")
	v2.Use(onlyForV2()) // v2 group middleware
	{
		v2.GET("/hello/:name", func(c *gee.Context) {
			// expect /hello/geektutu
			c.String(http.StatusOK, "hello %s, you're at %s\n", c.Param("name"), c.Path)
		})
	}

	r.Run(":9999")
}