gin-annotation

A powerful cli tool to implement gin annotation

Features

• Using code generating technology by operating golang AST
• Routing group
• Enable Aspect Oriented Programming for gin by middleware annotation

Quick Start

1. Installation.

go get github.com/1-st/gin-annotation

2. Write your HandlerFunc anywhere.

source code files see dir: _example/simple

// controller/hello.go
package controller

/* Hello a simple controller
[
	method:GET,
	groups:/api,
	path:/hello-world,
	need:auth
]
*/
func HelloWorld(ctx *gin.Context) {
	ctx.JSON(http.StatusOK, map[string]string{
		"msg": "hello, world",
	})
}

// middleware/auth.go
package middleware

/* Auth a simple middleware
[
	id:auth
]
*/
func Auth(ctx *gin.Context) {
	ctx.Next()
}

/* Log the first middleware in group /api
[
	id:log,
	group:/api@1
]
*/
func Log(ctx *gin.Context) {
	fmt.Println(ctx.ClientIP())
}

3. Run gin-annotation at dir: _example/simple: (you can specify multiple folders)

$ gin-annotation ./
$ ls
controller main.go route.entry.go(!!!new file)

tips: the name of new file is decided by environment variable GIN_ANNOTATION_FILE , default is route.entry.go

4. Look at the generated routing file

package main

import (
	"gin-annotation/_example/simple/controller"
	"gin-annotation/_example/simple/middleware"
	"github.com/gin-gonic/gin"
)

func Route(e *gin.Engine) {
	api := e.Group("/api", middleware.Log)
	{
		v1 := api.Group("/v1")
		{
			v1.GET("/hello-world", middleware.Auth, controller.HelloWorld)
		}
	}
}

5. The last step , call Route() at main.go

package main

import (
	"github.com/gin-gonic/gin"
	"path"
)

func main() {
	e := gin.Default()
	Route(e)
	_ = e.Run("ip:port")
}

Annotations

• handlers

  • groups
  • path
  • method
  • need

• middlewares

  • id
  • group

• notice

Groups Annotation

Each groups-annotation consists of multiple groups separated by spaces.

Path Annotation

The last element of path.

Method Annotation

GET,POST,DELETE,PATCH,OPTIONS or ANY.

Need Annotation

need:id1 id2,

Each element of need-annotation is the id of the middleware.

Id Annotation

The unique id of middleware.

Group Annotation

/* example
[
  id:example,
  group:/api/v1/@1, 
  group:/api/v2/@1
]
*/

Each middleware can have multiple group-annotations,

The number behind @ is the priority of middleware.

Notice

• Don't write extra "," in the last item of an annotation.

/* example
[
  id:example,
  group:/api/v1/@1    <- here
]
*/