前沿概述
为何不选择 beego，理由很简单，其设计风格已经不符合现在开发潮流，现实往往就是这样，看似完美实则鸡肋
gin 最大的特点，也是我最为看重的就是中间件功能，说真的，当我在 gin 框架中看到 next 这个关键字，心里真的有点小激动
因为我一般都是前后端分离一起写，所以
中间件
- 全局中间件
import (
"log"
"net/http"
"github.com/gin-gonic/gin"
)
func logger() gin.HandlerFunc {
return func(c *gin.Context) {
log.Println("before is next")
c.Next()
log.Println("after is next ")
}
}
func main() {
r := gin.New()
r.Use(logger())
r.GET("/user/:name", func(c *gin.Context) {
name := c.Param("name")
c.String(http.StatusOK, "Hello %s", name)
})
r.GET("/topic/:id", func(c *gin.Context) {
id := c.Param("id")
c.String(http.StatusOK, "you search is %s", id)
})
r.Run(":8080")
}- 路由中间件
func m1() gin.HandlerFunc {
return func(c *gin.Context) {
log.Println("before is m1")
c.Next()
log.Println("after is m1 ")
}
}
func m2() gin.HandlerFunc {
return func(c *gin.Context) {
log.Println("before is m2")
c.Next()
log.Println("after is m2 ")
}
}
func main() {
r := gin.New()
r.GET("/user/:name", m1(), func(c *gin.Context) {
name := c.Param("name")
c.String(http.StatusOK, "Hello %s", name)
})
r.GET("/topic/:id", m2(), func(c *gin.Context) {
id := c.Param("id")
c.String(http.StatusOK, "you search is %s", id)
})
r.Run(":8080")
}- 路由组中间件
func main() {
r := gin.New()
v1 := r.Group("v1", m1())
v1.GET("/user/:name", func(c *gin.Context) {
name := c.Param("name")
c.String(http.StatusOK, "Hello %s", name)
})
v1.GET("/topic/:id", func(c *gin.Context) {
id := c.Param("id")
c.String(http.StatusOK, "you search is %s", id)
})
v2 := r.Group("v2", m2())
v2.GET("/user/:name", func(c *gin.Context) {
name := c.Param("name")
c.String(http.StatusOK, "Hello %s", name)
})
v2.GET("/topic/:id", func(c *gin.Context) {
id := c.Param("id")
c.String(http.StatusOK, "you search is %s", id)
})
r.Run(":8080")
}- 在中间件或处理程序中启动新的 Goroutines 时，您不应该使用其中的原始上下文，您必须使用只读副本
func main() {
r := gin.Default()
r.GET("/long_async", func(c *gin.Context) {
// create copy to be used inside the goroutine
cCp := c.Copy()
go func() {
// simulate a long task with time.Sleep(). 5 seconds
time.Sleep(5 * time.Second)
// note that you are using the copied context "cCp", IMPORTANT
log.Println("Done! in path " + cCp.Request.URL.Path)
}()
})
r.GET("/long_sync", func(c *gin.Context) {
// simulate a long task with time.Sleep(). 5 seconds
time.Sleep(5 * time.Second)
// since we are NOT using a goroutine, we do not have to copy the context
log.Println("Done! in path " + c.Request.URL.Path)
})
// Listen and serve on 0.0.0.0:8080
r.Run(":8080")
}