egs

Egs is a Go framework based on Gin, designed to quickly generate Swagger documentation, which means "Easy Gin Swagger"

Featurs

• Fast and efficient routing with Gin
• Automatic generation of Swagger documentation

Why I build this project?

I once wanted to find a convenient way to generate Swagger documentation for Gin web services, and then I found this project SwaGin. But I found that the project has not been updated sometime and there are some problems with the code. Such as the following:

• panic when the response struct has pointers
• group doesn't work when use middlewares
• don't register components for structs which results in the Swagger JSON containing many duplicated information
• don't support enum type
• don't support OAuth and OIDC authentication
• can't register request struct
• wrong field value of apiKey authentication and don't support cookie and query api key
• authentications have the same name which causes

So I decided to rewrite many codes and fix the above problems.

Installation

go get -u github.com/Yuukirn/egs

Usage

1. Import the package in your Go file:

import "github.com/Yuukirn/egs"

2. Define a struct for the request parameters:

type TestStruct struct {
	ID    string `uri:"id" validate:"required" json:"id"`
	Name  string `form:"name" json:"name"`
	Age   int    `form:"age" json:"age"`
	Token string `header:"authorization" validate:"required" json:"token"`
}

Egs uses validator to validate the request parameters, so you need to add validate tags to the struct fields. And egs will bind the struct for you. 3. Define the api

func TestApi(c *gin.Context, req TestStruct) {
	bytes, err := json.Marshal(req)
	if err != nil {
		panic(err)
	}
	println(string(bytes))
	c.JSON(http.StatusOK, TestResp{
		Code: 200,
		Msg:  "OK",
	})
}

Note that the first parameter is *gin.Context, and the second parameter is the request struct. 4. Define the router

var test = router.NewRouter(TestApi,
	router.Tags("test"),
	router.Summary("test summary"),
	router.Desc("test desc"),
	router.Req(router.Request{
		Model: &TestStruct{},
	}),
	router.Resp(router.Response{
		"200": router.ResponseItem{
			Model: &TestResp{},
		},
	}),
)

You can also add other metadata here. 5. Register the router

testGroup := app.Group("test", egs.Handlers(testMiddleware), egs.Security(jwtAuth))
testGroup.POST("/:id", test)

You can find an example in the examples folder. Run the example and enter http://127.0.0.1:8080/docs then you can see the swagger docs like this.

TODO

• [ ] Add OAuth and OIDC authentication

ThanksTo

• SwaGin Swagger + Gin = SwaGin, a web framework based on Gin and Swagger
• kin-openapi, OpenAPI 3.0 implementation for Go (parsing, converting, validation, and more).
• Gin, an HTTP web framework written in Go (Golang).